JP2000356980A - Video display method, video display device and video output device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable various functions which are provided in a video display device to be efficiently used in → external equipment connected with a prescribed network. SOLUTION: This device is a video display device which is to be connected to a prescribed network. In this case, the device is provided with a first input part 30a or 30b receiving video data which are to be transmitted via the network, a second input part 30c receiving specific display data which are to be transmitted via the network, a display control part 31 selecting display modes by a video display by the video data received by the first input part 30a or 30b and a specific display by the display data received by the second input part 30c and a display part 33 displaying the display mode selected by the display control part 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to, for example, IEEE 1
Video transmission method suitable for transmission when a video output device and a video display device are connected in a network using a 394-system bus line, and a video display device and a video output device realizing the video transmission method About.

[0002]

2. Description of the Related Art Conventionally, a video display device such as a television receiver performs display processing of video data obtained at a video input terminal provided in the device and displays the video data on display means such as a cathode ray tube or a liquid crystal display panel. I was In the case of a television receiver, a tuner is provided, and video data included in a broadcast wave transmitted on a predetermined channel is displayed on a display unit.

[0003] Such a video display device tends to be multifunctional. For example, a display area of one screen is divided into a plurality of portions to display a plurality of channels of video, or display a video such as a television broadcast. Some models are capable of simultaneously displaying various information such as character information on an on-screen display (hereinafter referred to as OSD) during the display.

[0004]

However, such a multi-function display is basically executed by processing in the video display device based on video data or the like input to the video display device. , Cannot be controlled by another device. That is, for example, the display information for the OSD is generated from character information extracted from a broadcast wave or the like in the video display device, and the display information of the OSD is input from the outside or the display state of the display information is controlled. It was difficult to carry out efficiently.

[0005] It is an object of the present invention to enable various functions of a video display device to be efficiently used by an external device.

[0006]

SUMMARY OF THE INVENTION According to the present invention, when data transmitted from a video signal source to a predetermined network is received by a video display device and displayed, the first video signal is transmitted from the video signal source to the first network.
And the second video data is transmitted to the video display device via the network, and data relating to the display mode of the first and second video data on the video display device is transmitted from the video signal source to the video display device via the network. The first and second video display devices based on the data on the display mode.
The display mode of the video data is set.

According to the present invention, the display mode based on the first video data and the second video data obtained by the video display device via the network can be arbitrarily set by controlling the video signal source. .

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described.
This will be described with reference to the accompanying drawings.

FIG. 1 is a diagram showing a configuration of a video display device according to the present embodiment. In this embodiment, a video signal source and a display device are connected by a bus, and a video output from the video signal source is transmitted to the display device via the bus and displayed on the display device. It is. Here, a digital satellite broadcast receiver (IRD: In) is used as a video signal source.
In this example, an integrated receiver decoder (50) is used, and the television receiver 10 is used as a display device. The bus line 9 connecting the two devices 10 and 50 includes an IEEE (The Institute of Electrical and Electronics).
tronics Engineers) A bus line standardized as the 1394 system is applied.

FIG. 2 is a diagram showing a configuration example of the television receiver 10. The television receiver 10 has a terminal 1a connected to the antenna 1 (signal line for cable TV).
And a signal obtained at the terminal 1a is supplied to the tuner unit 20.
To receive. In addition, the television receiver 10 of the present example is provided with an interface unit 40, which is connected to a bus line 9 of the IEEE 1394 system and can be connected to a network constituted by the bus line 2. IEEE
The details of the state in which data transmission is performed on the bus line of the E1394 standard will be described later. , The two modes of data transmission can be mixed.

The isochronous transfer mode is a data transfer mode in which the amount of data transmission per unit time is secured, and is mainly used for transmitting stream data such as video data (moving images) and audio data which need to be transferred in real time. . The asynchronous transfer mode is a mode used for transmitting relatively short data such as control commands and still image data. When data to be transmitted is generated, a packet for transmitting the data is generated, and another data is transmitted. Transmit at any timing not used for transmission. The interface unit 40 is configured to be able to receive video data and audio data transmitted in the isochronous transfer mode and to receive various data transmitted in the asynchronous transfer mode.

Tuner section 2 in television receiver 10
Numeral 0 includes an RF unit 21, which receives an arbitrary broadcast channel. The RF unit 21 is connected to a video extracting unit 22, a data extracting unit 23, and an audio extracting unit 24. The video data included in the signal of the received channel is extracted by the video extracting unit 22 and the received channel is extracted. Various data other than video and audio included in the signal is extracted by the data extraction unit 23, and audio data included in the signal of the received channel is extracted by the audio extraction unit 24.

The respective data extracted by the video extracting unit 22, the data extracting unit 23, and the audio extracting unit 24 are supplied to a monitor unit 30. The monitor unit 30 includes a circuit system for performing video processing and a circuit system for performing audio processing. As a circuit system for performing video processing, a video selection unit 31 and the video selection unit 3
Video processing unit 32 that performs display processing of the video selected in 1
And a display unit 33 for displaying the video processed by the video processing unit 32. Various display means such as a cathode ray tube and a liquid crystal display panel are used as the display unit 33.

As a circuit system for performing audio processing, an audio selection unit 34, an audio processing unit 35 for performing output processing of the audio data selected by the audio selection unit 34, and an audio processing unit 3
And a speaker 36 for outputting the sound output-processed in step 5.

The video selection unit 31 includes video data from the video extraction unit 22 of the tuner unit 20, data from the data extraction unit 23, video data transmitted from the bus line 9 to the interface unit 40, and / or other data. Is supplied, and this data is selected to generate video data based on the display mode. In this case, the video data from the video extraction unit 22 and the interface unit 40
, Video data of a plurality of systems may be supplied. The video data supplied from the bus line 9 to the interface unit 40 is
It is digital data, and the video processing unit 32 can perform digital processing. Specifically, for example, MPE
The video data of the G system is decoded so that the image can be received. Further, video data of a still image transmitted by a bitmap method or the like can be superimposed on other video data.

The audio selection unit 34 receives audio data from the audio extraction unit 24 of the tuner unit 20, audio data and / or other data from the interface unit 40, and data from the data extraction unit 23. Select any audio data. This selection is made by the data extraction unit 23
Alternatively, the sound to be selected is determined based on data or the like supplied from the interface unit 40, and the determined sound data is selected and supplied to the sound processing unit 35. In this case, the audio data from the audio extraction unit 24 and the audio data from the interface unit 40 may be supplied with audio data of a plurality of systems. The audio data supplied from the bus line 9 to the interface unit 40 is digital data, and the audio processing unit 35 can perform processing such as decoding of digital data and analog conversion.

Next, the details of the configuration for selecting the video and audio transmitted from the bus line 9 by the monitor unit 30 in the television receiver 10 will be described with reference to FIG. The monitor unit 30 of the present example is provided with a plurality of subunit plugs for performing input processing of data such as video data and audio data from the interface unit 40. Here, at least three subunit plugs 30a, 30
b and 30c are prepared. Each subunit plug 30
a, 30b, and 30c are IEEE139 as described later.
It is a plug for receiving data transmitted through the four types of bus lines, and includes a register as a buffer for temporarily storing received data.

The subunit plugs 30a and 30b are
The input unit receives a video program (one program) including video data and audio data attached to the video data. Therefore, two subunit plugs 30
In a and 30b, two video programs can be input simultaneously. In addition, each subunit plug 30a and 30b
The video data and the audio data from the tuner unit 20 may be selectable as the video data and the audio data to be input to the. The video data and audio data received by the interface unit 40 via the bus line 9 are basically data transmitted in the isochronous transfer mode.

Another subunit plug 3 prepared
0c is an input unit for receiving display data for OSD from the interface unit 40. The OSD display data is data that is transmitted on the bus line 2 in the asynchronous transfer mode and received by the interface unit 40, for example. Therefore, the other device (not shown) connected via the bus line 2 transmits video data and audio data in the isochronous transfer mode, and transmits OSD display data and other data in the asynchronous transfer mode. It is sent out. The display mode of the OSD display data and the like may be transmitted in the same packet as the OSD display data.

Each subunit plug 30a, 30b, 3
The video data and the display data obtained at 0c are supplied to the video selection unit 31 and are selected in a set display mode. In this case, the display mode is set in the case where the setting is made in the television receiver 10 and in the case where the interface section 4 is set.
0 may be set based on data received via the network. Subunit plugs 30a, 30
The audio data obtained in b is supplied to the audio selection unit 34, and the audio data is selected in the set state.

Each sub unit plug 30a, 30b, 3
The characteristic (feature) of 0c is described and set by a descriptor (Subunit Identifier Descriptor) in the subunit. Here, the number of subunit plugs is also three, but the number can also be variably set by a descriptor in the subunit. The subunit and the plugs and descriptors that the subunit has
It is stipulated when video equipment and audio equipment are connected by an IEEE 1394 bus line,
The details will be described later.

The asynchronous transfer mode packet received by the interface unit 40 via the bus line 2 and obtained by the subunit plug 30c includes an OD
In some cases, in addition to the display data for S, data of a command for setting a processing state in each unit in the monitor unit 30 may be included. When the command is obtained in the subunit plug 30c, the processing in the monitor unit 30 Is set to the corresponding state. More specifically, a display mode such as a video selection state or a multi-screen display state, a voice selection state, and a display mode of information such as characters and figures by the OSD can be set.

FIG. 4 is a diagram showing the configuration of a digital satellite broadcast receiver (hereinafter referred to as IRD) 50 for receiving digital satellite broadcasts. A broadcast wave from a satellite (not shown) is received by the antenna 2 and input to the terminal 2a.
Tuner 51 provided as a program selection means provided in
To supply. The IRD 30 is configured such that each circuit operates under the control of the CPU 61, and a tuner 51.
To obtain a signal of a predetermined channel. Tuner 51
Is supplied to the descrambling circuit 52.

The descramble circuit 52 receives a contracted channel (or an encrypted channel) from the received data based on the contracted channel encryption key information stored in an IC card (not shown) inserted into the main body of the IRD 50. Only the multiplexed data of the non-existing channel is extracted and supplied to the demultiplexer 53.

The demultiplexer 53 rearranges the supplied multiplexed data for each channel, takes out only the channel specified by the user, sends out a video stream composed of packets of video portions to the MPEG video decoder 54, An overlap stream composed of packets of the audio portion is sent to the MPEG audio decoder 59.

The MPEG video decoder 54 restores the video data before compression encoding by decoding the video stream, and converts this to NTSC via an adder 55.
It is sent to the encoder 56. NTSC encoder 56
Converts the video data into a luminance signal and a color difference signal of the NTSC system, and sends them to the digital / analog converter 57 as NTSC system video data. The digital / analog converter 57 converts the NTSC data into an analog video signal and supplies it to a connected receiver (not shown).

The IRD 50 according to the present embodiment controls the on-screen display (OS
An OSD data generation unit 58 for generating video data for various displays for D) is provided. This OSD data generator 58
The OSD video data (display data) generated in
The video is supplied to the adder 55 and is superimposed on the video data output from the MPEG video decoder 54 so that the OSD video is superimposed on the received broadcast video.

The MPEG audio decoder 59 restores PCM audio data before compression encoding by decoding the audio stream, and sends the data to the digital / analog converter 60.

The digital / analog converter 60 is a PCM
By converting audio data into an analog signal, L
It generates a Ch audio signal and an RCh audio signal, and outputs them as a sound via a speaker (not shown) of the connected audio reproducing system.

The IRD 50 according to the present embodiment supplies the video stream and the audio stream extracted by the demultiplexer 53 to the IEEE 1394 interface 62, and the IEEE 1394 interface 62 connected to the interface 62.
It is configured to be able to transmit to the 1394 bus line 9. The received video stream and audio stream are transmitted in the isochronous transfer mode. Further, when the OSD data generation unit 58 is generating OSD video data, the OSD data generation unit 58 transmits the video data to the CPU 6.
1 to the interface unit 62 so that the OSD video data can be transmitted from the interface unit 62 to the bus line 9. Here, the OSD video data is transmitted in an asynchronous transfer mode in a descriptor format defined by an AV / C command. The details of the OSD video data transmission process will be described later.

The CPU 61 has a work RAM 63 and an R
AM64 is connected, and control processing is performed using these memories. Further, an operation command from the operation panel 65 and a remote control signal from the infrared light receiving section 66 are supplied to the CPU 61 so that operations based on various operations can be executed. The CPU 61 can determine a command, a response, and the like transmitted from the bus line 9 to the interface unit 62.

Next, the IRD 50 and the television receiver 1
A state in which data transmission is performed on the IEEE 1394 bus line 9 to which 0 is connected will be described. FIG.
FIG. 3 is a diagram showing a cycle structure of data transmission of devices connected by EEE1394. In IEEE 1394, each device connected to a bus line is called a node. The data transmitted on the bus is divided into packets,
Is transmitted in a time-sharing manner on the basis of a cycle of length.
This cycle is created by a cycle start signal supplied from a node having a cycle master function (any device connected to the bus).

The isochronous packet secures a band (a time unit but called a band) necessary for transmission from the beginning of every cycle. Therefore, in isochronous transmission, transmission of data within a certain time is guaranteed. However, if a transmission error occurs, there is no protection mechanism and data is lost. Asynchronous transmission, in which the node that has secured the bus as a result of arbitration, sends out asynchronous packets during the time that is not used for isochronous transmission in each cycle, ensures reliable transmission by using acknowledgments and retries. However, the transmission timing is not constant.

In order for a given node to perform isochronous transmission, that node must support the isochronous function. At least one of the nodes corresponding to the isochronous function must have a cycle master function. Further, at least one of the nodes connected to the IEEE 1394 serial bus includes:
It must have the function of an isochronous resource manager.

IEEE 1394 is an ISO / IEC13 standard.
213 is based on the CSR (Control & Status Register) architecture having a 64-bit address space. FIG. 6 is a diagram illustrating the structure of the address space of the CSR architecture. The upper 16 bits are
This is a node ID indicating a node on each IEEE 1394, and the remaining 48 bits are used to specify an address space given to each node. The upper 16 bits further comprise 10 bits of the bus ID and 6 bits of the physical ID (node ID in a narrow sense).
Split into bits. Since a value in which all bits are 1 is used for a special purpose, it is possible to specify 1023 buses and 63 nodes.

Of the 256 terabytes of address space defined by the lower 48 bits, the space defined by the upper 20 bits is the initial register space (2048 bytes) used for CSR-specific registers and IEEE1394-specific registers. The space defined by the lower 28 bits is divided into the initial register space, and the space defined by the lower 28 bits is divided into an initial register space, a private space (Private Space), and an initial memory space (Initial Memory Space). , The configuration ROM (Conf
iguration ROM), initial unit space (Inital UnitSpace) used for node-specific applications, Plug Control Register (P
CRs)).

FIG. 7 is a view for explaining offset addresses, names, and functions of main CSRs. The offset in FIG. 7 is the FF where the initial register space starts.
FFF00000000h (The number with h at the end is 16
(Indicating a hexadecimal notation). Bandwidth Available Register with Offset 220h
ster) indicates a band that can be allocated to isochronous communication, and only the value of the node operating as the isochronous resource manager is valid. That is, although each node has the CSR in FIG. 6, only the isochronous resource manager of the bandwidth available register is valid. In other words, the bandwidth available register has substantially only the isochronous resource manager.
The maximum value is stored in the bandwidth available register when a band is not allocated to isochronous communication, and the value decreases each time a band is allocated.

Channel Available Registers with offsets 224h to 228h
ter) corresponds to each of the channel numbers from 0 to 63, and when the bit is 0, it indicates that the channel has already been assigned. Only the channel available register of the node operating as the isochronous resource manager is valid.

Returning to FIG. 6, a general ROM is stored at addresses 200h to 400h in the initial register space.
A configuration ROM based on the format is arranged. FIG. 8 is a diagram illustrating the general ROM format. A node, which is a unit of access on IEEE 1394, can have a plurality of units that operate independently while using an address space commonly in the node. Unit directory
s) can indicate the software version or location for this unit. Bus info block and root directory (root direc)
tory) is fixed, but the positions of other blocks are specified by offset addresses.

FIG. 9 is a diagram showing details of the bus info block, the root directory, and the unit directory. Company in the bus info block
The ID stores an ID number indicating the manufacturer of the device.
The Chip ID stores a unique ID unique to the device and a unique ID in the world that does not overlap with other devices. Also, IEC1
According to the standard of 833, the unit specification ID (unit s) of the unit directory of the device satisfying IEC1883
pec id), 00h for the first octet, Aoh for the second octet, 2 for the third octet.
Dh are respectively written. Furthermore, the first octet of the unit switch version (unit sw version) is 01h, and the LSB of the third octet is
1 is written.

In order to control the input / output of the device via the interface, the node stores IEC1 at addresses 900h to 9FFh in the initial unit space shown in FIG.
PCR (Plug Control Register) specified in 883
Having. This implements the concept of a plug in order to form a signal path logically similar to an analog interface. FIG. 10 is a diagram illustrating the configuration of the PCR. PCR is an oPC representing an output plug
It has an R (output Plug Control Register) and an iPCR (input Plug Control Register) representing an input plug. The PCR is a register oMPR (output Maste) indicating information of an output plug or an input plug unique to each device.
r Plug Register) and iMPR (input Master Plug Re
gister). Each device has oMPR and iMPR
However, it is possible to have a plurality of oPCRs and iPCRs corresponding to individual plugs depending on the capability of the device. The PCR shown in FIG.
Each has 31 oPCRs and iPCRs. The flow of isochronous data is controlled by manipulating registers corresponding to these plugs.

FIG. 11 shows oMPR, oPCR, iMP
It is a figure showing composition of R and iPCR. FIG.
11A shows the configuration of oMPR, FIG. 11B shows the configuration of oPCR, FIG. 11C shows the configuration of iMPR, and FIG.
(D) shows the configuration of iPCR. The 2-bit data rate capability on the MSB side of the oMPR and iMPR stores a code indicating the maximum transmission rate of isochronous data that can be transmitted or received by the device. oMPR broadcast channel base
Specifies the number of the channel used for broadcast output.

5 bit number of output plugs on the LSB side of oMPR
Indicates the number of output plugs of the device, ie, oPC
A value indicating the number of R is stored. 5 on the LSB side of iMPR
Number of input plugs
input plugs) contains the number of input plugs the device has,
That is, a value indicating the number of iPCRs is stored. non-
persistenceextension field
And persistent extension f
The field is an area defined for future expansion.

The on-line of the MSB of the oPCR and iPCR indicates the usage status of the plug. That is, if the value is 1, the plug is ON-LINE, and if the value is 0, the plug is OFF-LINE.
The value of the broadcast connection counter of oPCR and iPCR is
Indicates whether there is a broadcast connection (1) or not (0). A point-to-point connection counter (po having a 6-bit width of oPCR and iPCR)
The value of the int-to-point connection counter indicates the number of point-to-point connections that the plug has.

The value of the channel number having a 6-bit width of oPCR and iPCR indicates the number of the isochronous channel to which the plug is connected. The value of the data rate (data rate) having a 2-bit width of the oPCR indicates the actual transmission speed of the packet of the isochronous data output from the plug. Overhead ID having 4-bit width of oPCR
The code stored in (overhead ID) indicates the over bandwidth of the isochronous communication. The value of the payload (payload) having a 10-bit width of the oPCR indicates the maximum value of data included in an isochronous packet that can be handled by the plug.

FIG. 12 is a diagram showing the relationship between plugs, plug control registers, and isochronous channels. AV device (AV-device)
e) 71 to 73 are connected by an IEEE 1394 serial bus. OPCR in which the transmission speed and the number of oPCRs are defined by the oMPR of the AV device 73

[0]
~ OPCR [2], the isochronous data of which channel is designated by oPCR [1] is IEEE1
394 Serious bus channel # 1 (channel # 1)
Sent to IPCR in which the transmission speed and the number of iPCRs are defined by the iMPR of the AV device 71

[0] and iP
In CR [1], the input channel # 1 has the transmission speed and i
PCR

According to [0], the AV device 71
The isochronous data transmitted to channel # 1 of the 394 serial bus is read. Similarly, AV device 7
2 is oPCR

Channel # 2 (ch specified in [0])
send isochronous data to annel # 2)
The device 71 reads the isochronous data from the channel # 2 specified by iPRC [1]. Although the input plug and the output plug for the isochronous transfer have been described here, the input plug and the output plug for the asynchronous transfer are also described at each node (equipment).
Is prepared.

As described above, data transmission is performed between devices connected by the IEEE 1394 serial bus. In the system of this embodiment, the IEEE 1394 serial bus is used.
Using an AV / C command set defined as a command for controlling a device connected via a serial bus, control of each device, determination of a state, and the like can be performed. Next, the AV / C command set will be described.

First, the AV /
Subunit Identifier Descriptor in C command set
The data structure of r) will be described with reference to FIGS. FIG. 13 shows the data structure of the subunit identifier descriptor. FIG.
As shown in FIG. 1, the descriptor is formed by a hierarchical list. The list represents, for example, a receivable channel in the case of a tuner, and music recorded in the tuner in the case of a disc. The list in the highest layer of the hierarchical structure is called a root list, and for example, list 0 is the root for the lower list. Lists 2 to (n-1) are also route lists. There are as many route lists as objects. Here, the object is, for example, each channel in digital broadcasting when the AV device is a tuner. In addition, all the lists in one hierarchy share common information.

FIG. 14 shows Tha General Subunit Identifi
er Descriptor format is shown. Subunit
In the Identifier Descriptor, attribute information on the function is described in the contents. The generation ID (generation ID) indicates the version of the AV / C command set. Here, "00h"
Means that the data structure and command are AV / C General
This means that the specification is version 3.0. Also, as shown in FIG.
All values except “00h” are reserved and reserved for future specifications.

[0050] size of list ID
) Indicates the number of bytes of the list ID. The size of object ID indicates the number of bytes of the object ID. The size of object position indicates the position (the number of bytes) in the list used for reference at the time of control. The number of root object lists (number of root objectlists) indicates the number of root object lists. The root object list ID (root object list id) indicates an ID for identifying the root object list at the top of each independent hierarchy.

The subunit dependent length (subunit
dependent length) indicates the number of bytes of the subsequent subunit dependent information field. The subunit dependent information is a field indicating information unique to the function. The manufacturer dependent length indicates the number of bytes of a subsequent manufacturer dependent information field. Manufacturer dependent information (manufacturer d
“ependent information” is a field indicating specification information of the vendor (manufacturer). This field does not exist if there is no manufacturer dependent information in the descriptor.

FIG. 16 shows the list ID allocation range shown in FIG. As shown in FIG.
00h to 0FFFh "and" 4000h to FFF "
“Fh” is reserved and reserved as an allocation range for future specifications, and “1000h to 3FFFh” and values after “10000h” are prepared for identifying function type dependent information.

Next, the AV /
The C command set will be described with reference to FIGS. FIG. 17 shows a stack model of the AV / C command set. As shown in FIG. 17, the physical layer 81, the link layer 82, the transaction layer 83, and the serious bus management 84
It conforms to EE1394. FCP (Function Contr
ol Protocol) 85 conforms to IEC61883. The AV / C command set 86 complies with the 1394TA specification.

FIG. 18 is a diagram for explaining commands and responses of the FCP 85 of FIG. FCP is IE
This is a protocol for controlling AV equipment on EE1394. As shown in FIG. 18, the controlling side is the controller, and the controlled side is the target. The transmission or response of the FCP command is performed between the nodes using an IEEE 1394 asynchronous transaction write transaction. The target that has received the data returns an acknowledgment to the controller for reception confirmation.

FIG. 19 is a diagram for explaining the relationship between the FCP command and the response shown in FIG. 18 in more detail. Node A and node B are connected via an IEEE 1394 bus. Node A is the controller and node B is the target. Each of the node A and the node B has a command register and a response register prepared for each 512 bytes. As shown in FIG. 19, the controller transmits a command by writing a command message to the command register 93 of the target. Conversely, the target transmits a response by writing a response message to the response register 92 of the controller. Control information is exchanged for the above two messages. The type of command set sent by FCP is described in CTS in a data field of FIG. 20 described later.

FIG. 20 shows the data structure of a packet transmitted in the asynchronous transfer mode of the AV / C command. The AV / C command set is a command set for controlling AV equipment, and CTS (command set ID) = "0000". AV / C command frames and response frames are exchanged between nodes using the FCP. To avoid burdening the bus and AV equipment, the response to the command is 1
It is to be performed within 00 ms. As shown in FIG. 20, the data of the asynchronous packet is
It is composed of two bits (= 1 quadlet). The upper part in the figure shows the header part of the packet, and the lower part in the figure shows the data block. Destination ID
(Destination ID) indicates a destination.

CTS indicates the ID of the command set. In the AV / C command set, CTS = "0000"
It is. The c type / response field indicates the functional classification of the command when the packet is a command, and indicates the processing result of the command when the packet is a response. Commands are broadly divided into (1) commands for controlling functions from outside (CONTROL),
(2) Command for inquiring the status from outside (STAT
US), (3) A command for inquiring externally whether or not control commands are supported (GENERAL INQUIL)
RY (opcode support or not) and SPEC
IFIC INQUIRY (opcode and ope
(4) command for requesting external notification of state change (NOTIFY)
Are defined.

The response is returned according to the type of the command. Responses to the CONTROL command include NOT IMPLEMENTED (not implemented), ACCEPTED (accept), and REJECT.
ED (rejection) and (INTERIM (provisional). The response to the STATUS command includes N
OT IMPLEMENTED, REJECTED, I
N TRANSITION (migrating) and STAB
There is LE (stable). GENERAL INQUIRY
Responses to the SPECIFIC INQUIRY command include IMPLEMENTED (implemented) and NOT IMPLEMENTED. In response to the NOTIFY command,
NOT IMPLEMENTED, REJECTED,
INTERIM and CHANGED (changed).

The subunit type is
It is provided to specify a function in the device, and for example, a tape recorder / player, a tuner, and the like are assigned. In order to determine when a plurality of subunits of the same type exist, a subunit ID is used as a determination number.
(Subunit id) is addressed. opcode
Represents a command, and operand represents a parameter of the command. Additional op
“erands” is a field added as necessary. The padding is also a field added as needed. data CRC (Cyclic redundancy Check)
) Is used for error checking during data transmission.

FIG. 21 shows a specific example of the AV / C command. FIG. 21A shows ctype / response.
A specific example of se is shown. The upper part of the figure represents a command, and the lower part of the figure represents a response. "000
CONTROL for "0" and STATU for "0001"
S, "0010" is SPECIFIC INQUIR
NOTIFY is assigned to Y and “0011”, and GENERAL INQUIRY is assigned to “0100”. “0101 to 0111” are reserved and reserved for future specifications. "1000" has NOT I
NPLEMENTED, "1001" is ACCEPT
ED, “1010” has REJECTED, “101”
“1” is IN TRANSITION, “1100” is IMPLEMENTED / STABLE, “110”.
"1" is CHNGED, "1111" is INTERI
M has been assigned. “1110” is reserved and reserved for future specifications.

FIG. 21B shows a specific example of the subunit type. "00000" contains Video M
monitor, "00011" is Disk reco
rder / Player, “00100” is Tape
recorder / Player, “00101” is Tuner, and “00111” is Video Cam
era, Vendor uniqu in "11100"
e, “11110” has Subunit type e
xtended to next byte is assigned. Note that a unit is assigned to “11111”, which is used when it is sent to the device itself, for example, power on / off.

FIG. 21C shows a specific example of the opcode. There is an opcode table for each subunit type, where the subunit type is T
op in case of ape recorder / Player
code. Also, for each opcode,
rand is defined. Here, "00h" is VENDOR-DEPENDENT, and "50h" is S
EACH MODE, TIMECOD for "51h"
E, ATN for "52h", OPEN for "60h"
MIC, “61h” has READ MIC, “62h”
For WRITEMIC and for "C1h" LOAD ME
DIUM, RECORD is assigned to “C2h”, PLAY is assigned to “C3h”, and WIND is assigned to “C4h”.

FIG. 22 shows a specific example of an AV / C command and response. For example, when a playback instruction is given to a playback device as a target (consumer), the controller sends a command as shown in FIG. 22A to the target. Since this command uses the AV / C command set, CTS = "0000". c
The type includes a command (CO) for externally controlling the device.
NTTYPE), so ctype = “0000”
(See FIG. 21A). Since the subunit type is Tape recorder / Player, the subunit type = "00100"
(See FIG. 21B). id indicates the case of ID0, and id = 000. opco
The de is “C3h” meaning reproduction (FIG. 21).
(C)). The operand is “75h” meaning FORWARD. And when played,
The target returns a response as shown in FIG. Here, access
Because pted enters response, response
se = "1001" (see FIG. 21A). Except for the response, the rest is the same as FIG.

Next, using the IEEE 1394 bus line 9 set to perform the above-described transmission processing, the IRD 50 and the television receiver 10 connected as shown in FIG. Processing for transmitting video data and the like will be described. A digital satellite broadcast of a predetermined channel is received by the IRD 50, and the video data and audio data of the received channel are transmitted to the bus line 9.
TV receiver 10 in isochronous transfer mode
Is transmitted to At this time, a PtoP connection, which is a process for establishing a connection on the bus between the IRD 50 and the television receiver 10, is established, and synchronous transmission is performed using the prepared isochronous packet of the channel. The video data and the audio data transmitted here are the video data and the audio data, respectively, which are compressed by the MPEG system, and the television receiver 10 performs decoding from the MPEG system.

Then, this video is transmitted to the television receiver 1
OSD generated in IRD50 when displaying with 0
When it is necessary to display video for
The video data for SD is also transmitted from the IRD 50 to the television receiver 10 via the bus line 9. When transmitting OSD video data of a still image, the OSD data generation unit 58 generates the OSD video data as bitmap video data under the control of the CPU 61 in the IRD 50, for example. Under the control of the CPU 61, the generated bitmap OSD video data is transmitted to the bus line 9 from the interface unit 62 in the form of an asynchronous transfer mode as the descriptor format data described above.

At this time, the data in the descriptor format is already hierarchically structured data as shown in FIG. 13, and bitmap data to be displayed as OSD is arranged at a specific position. Also,
Data relating to a display mode, such as where to place the bitmap data in the display video, is arranged at different positions of the same descriptor format data. The data relating to the display mode may be data indicating not only the display position but also the processing state (contrast, brightness, etc.) of the displayed video. In addition to the video displayed as OSD,
The data may indicate the display mode of the main video.

By transmitting in this manner, IRD5
0 is transmitted to the television receiver without decoding in the IRD without being decoded in the IRD. In the television receiver, the bitmap format data transmitted separately from the MPEG video data is transmitted. OS
The OSD display processing can be easily performed by superimposing the D video data on the video data decoded from the MPEG video data. That is, conventionally, such an IRD is connected to a television receiver, and the ORD generated in the IRD is connected.
When superimposing the video for SD on the received video, the received MPEG video data is decoded in the IRD, the video for OSD is superimposed on the decoded video, and then the MPEG is again transmitted in the IRD. It is necessary to encode the data in the MPEG format and transmit the data in the MPEG format to the television receiver. On the other hand, in the case of this example, IE
As the video data for the OSD is transmitted as the data of the descriptor format using the packet for the asynchronous transfer mode prepared in the EE1394 standard, the decoding from the MPEG system is not required in the IRD, and the processing is performed. Will be very easy.

The display mode of the OSD video is also indicated by the data arranged at another position of the data in the descriptor format, so that the video processing unit in the television receiver determines the data. , Good on-screen display processing can be performed based on instructions from the IRD.

In the above description, the still image is superimposed on the received image on the on-screen display (OSD). However, other image data obtained in the IRD is transmitted by the same processing. The television receiver, which is a display device, may superimpose the image on a received image or the like. For example, Picture in Picture (PinP)
Alternatively, when performing a process of displaying a received image of another channel on or within a received image of a specific channel called picture and picture (PandP), the video data for the small screen is Alternatively, transmission may be performed using another transmission path on the bus line.
In this case, when the video data of the child screen is a still image, similarly to the case of the OSD video data described above,
The packet may be transmitted in the asynchronous transfer mode, and a new packet may be transmitted each time the still image is updated. If the child screen is a video,
An isochronous channel different from the isochronous channel for transmitting the main image may be set to simultaneously transmit both video data to the receiver.

In the embodiment described so far,
Although an example is described in which a network is formed by bus lines of the IEEE 1394 system, devices connected to a network constituted by communication means of another system capable of performing similar transmission include:
It goes without saying that the present invention can be applied.

Although the video output device described in the above embodiment is an IRD which is a tuner for receiving digital broadcasts, it can be applied to other video signal sources. For example, a video playback device such as a VTR device or a video disc playback device may be used as the video signal source. Also, in the above-described embodiment, the video display device performs video and audio processing as a television receiver. However, for example, a video display device such as a monitor receiver or a projector device that does not perform audio output processing is used. Also applicable to

[0072]

According to the video display method of the first aspect, the first video display device can obtain the first video display device via a network.
Display form by the video data of the second and the second video data,
It is possible to set arbitrarily by the control from the video signal source. For example, the specific position of the video displayed by the first video data without performing the process of processing the first video data by the video signal source Then, a display mode in which a specific video is superimposed can be executed by an instruction from a video signal source.

According to the video display method described in claim 2, in the invention described in claim 1, the first video data is data of a main video to be displayed on the video display device, and the second video data is the second video data. The data is the data of the video to be displayed on the on-screen display in the main video, and the display format of the video to be displayed on the on-screen display is set by the data related to the display format, so that the network In accordance with an instruction from the connected video signal source, processing for performing various displays on the on-screen display is simplified.

According to the video display method described in claim 3, in the invention described in claim 1, the first video data is stream data transmitted from a video signal source in the isochronous transfer mode, and the second video data is the second video data. Is video data transmitted from a video signal source in an asynchronous transfer mode. For example, while transmitting a video signal of a moving image to a display device as first video data, the video data of the first video data By transmitting a still image or the like that is to be superimposed and displayed as the second video data, a specific image or the like can be displayed under the control of the video signal source, by using a transmission band prepared on the network. It can be used efficiently.

According to the video display method described in claim 4, in the invention described in claim 3, the second video data is transmitted as data in a descriptor format having a predetermined hierarchical structure, and the second video data is transmitted in a predetermined format in the descriptor format. By arranging the second video data and the data in the display mode in the hierarchy of the data, the data such as the still image and the data in the display mode of the image can be efficiently transmitted as a set of hierarchically structured data. Is done.

According to the video display device of the present invention, the display mode based on the first video data and the second video data received via the network can be arbitrarily set. It is possible to easily set a display mode in which a specific image of the second image data is superimposed on a specific position of the image displayed by the first image data.

According to the video display device described in claim 6, in the invention described in claim 5, the second video data received by the input unit is data for displaying a video for an on-screen display, By specifying the video display format based on that data with the accompanying data,
It is possible to display an image based on the first and second image data in a display form instructed from outside via a network.

According to the video display device described in claim 7, in the invention described in claim 5, reception of the first video data at the input unit is performed by receiving video data transmitted in the isochronous transfer mode. The reception of the second video data at the input unit is the reception of the video data transmitted in the asynchronous transfer mode. For example, while transmitting the video signal of the moving image to the display device as the first video data, It is possible to receive a still image or the like to be superimposed and displayed on the video based on the first video data as the second video data and display the video based on both data satisfactorily. It is possible to display a plurality of types of video data transmitted efficiently using the transmission band.

According to the video output device of the present invention, when the first and second video data are output to the network, the data relating to the display form of the video based on the two video data is included in the second video data. With the addition, the display mode based on the first video data and the second video data can be arbitrarily set under the control of the video output device. A display mode in which a specific video is superimposed on a specific position of a video displayed by the first video data can be executed by an instruction on the received display device side without performing a process of processing the data. become.

According to the video output device described in claim 9, in the invention described in claim 8, the first video data is data of a main video, and the second video data is data of the main video. In the video, it is the data of the video to be displayed on the on-screen display, and the data related to the display format added by the control unit. The processing of the on-screen display for superimposing the image data can be easily realized without performing any special processing on the original video data.

According to the video output device described in claim 10, in the invention described in claim 9, the first video data output from the output unit is stream data output in the isochronous transfer mode. Is output in the asynchronous transfer mode, for example, while transmitting a video signal of a moving image as the first video data,
By transmitting, as the second video data, a still image or the like that the user wants to superimpose and display in the video of the first video data, it is possible to display a specific image or the like by using a transmission band prepared on the network. It can be used efficiently.

According to the video output device described in claim 11, in the invention described in claim 10, the second video data is output from the output unit as descriptor format data having a predetermined hierarchical structure, and the control unit outputs the second video data. By controlling the arrangement of the second video data and the display format data in a predetermined hierarchy of the descriptor format, data such as a still image and data of the display format of the image are hierarchically structured. Can be efficiently transmitted as one set of data.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an example of a network configuration according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating an example of a configuration of a television receiver according to one embodiment of the present invention.

FIG. 3 is a block diagram showing an example of a configuration of a main part of the television receiver according to one embodiment of the present invention.

FIG. 4 is a block diagram illustrating an example of a configuration of an IRD according to an embodiment of the present invention.

FIG. 5 is an explanatory diagram showing an example of a cycle structure of data transmission on an IEEE 1394 bus.

FIG. 6 is an explanatory diagram showing an example of the structure of an address space of the CRS architecture.

FIG. 7 is an explanatory diagram showing examples of positions, names, and functions of main CRSs.

FIG. 8 is an explanatory diagram showing an example of a general ROM format.

FIG. 9 is a bus info block, a root directory,
FIG. 4 is an explanatory diagram illustrating an example of a unit directory.

FIG. 10 is an explanatory diagram illustrating an example of a configuration of a PCR.

FIG. 11 is an explanatory diagram showing an example of the configuration of oMPR, oPCR, iMPR, and iPCR.

FIG. 12 is an explanatory diagram showing an example of a relationship among a plug, a plug control register, and a transmission channel.

FIG. 13 is an explanatory diagram showing an example of a data structure based on a hierarchical structure of a descriptor.

FIG. 14 is an explanatory diagram illustrating an example of a data format of a descriptor.

FIG. 15 is an explanatory diagram showing an example of a generation ID in FIG. 14;

FIG. 16 is an explanatory diagram showing an example of a list ID in FIG. 14;

FIG. 17 is an explanatory diagram showing an example of a stack model of an AV / C command.

FIG. 18 is an explanatory diagram showing the relationship between FCP commands and responses.

FIG. 19 is an explanatory diagram showing the relationship between the command and the response in FIG. 18 in further detail;

FIG. 20 is an explanatory diagram showing an example of a data structure of an AV / C command.

FIG. 21 is an explanatory diagram showing a specific example of an AV / C command.

FIG. 22 is an explanatory diagram showing a specific example of a command and a response of an AV / C command.

[Explanation of symbols]

9 Bus line, 10 Television receiver, 20 Tuner section, 22 Image extraction section, 23 Data extraction section, 2
4 ... Sound extraction unit, 30 ... Monitor unit, 30a, 30b, 3
0c: sub-unit plug, 31: video selector, 32 ...
Video processing unit 33, display unit 34, audio selection unit 35
Audio processing unit, 36 speaker, 40 interface unit, 50 digital satellite broadcast receiver (IRD), 51 ...
Tuner, 52 ... descramble descramble circuit,
53 ... demultiplexer, 54 ... MPEG video decoder, 55 ... adder, 56 ... NTSC encoder, 57 ...
Digital / analog converter, 58: OSD data generation unit, 59: MPEG audio decoder, 60: digital / analog converter, 61: CPU, 62: interface unit, 63: work RAM, 64: RAM, 65 ...
Operation panel 66 Infrared receiver

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/45 H04N 7/20 630 // H04N 7/20 630 G09G 5/00 555D

Claims (11)

[Claims] 1. A video display method for receiving and displaying, by a video display device, data transmitted from a video signal source to a predetermined network, wherein first and second video data from the video signal source are transmitted through the network. Sending the data relating to the display mode on the video display device based on the first and second video data from the video signal source to the video display device via the network; A video display method, wherein a display mode of the first and second video data in the video display device is set based on data on the mode. 2. The video display method according to claim 1, wherein the first video data is main video data to be displayed on the video display device, and the second video data is the main video data. A video display method, wherein the display format of the video displayed on the on-screen display is set by the data relating to the display format. 3. The video display method according to claim 1, wherein said first video data is stream data transmitted from said video signal source in an isochronous transfer mode, and said second video data is asynchronous transfer. A video display method which is video data transmitted from the video signal source in a mode. 4. The video display method according to claim 3, wherein the second video data is transmitted as data in a descriptor format having a predetermined hierarchical structure, and the second video data is transmitted in a predetermined hierarchy in the descriptor format. A video display method in which the data of the above-mentioned display form is arranged. 5. A video display device connected to a predetermined network, wherein the video display device receives first video data transmitted through the network in a first form and transmits the first video data through the network. An input unit that receives the second video data in a second format; a display control that sets a video display format based on the first video data received by the input unit and a video display format based on the second video data A video display device comprising: a display unit configured to perform display in a display mode set by the display control unit. 6. The video display device according to claim 5, wherein the second video data received by the input unit is data for displaying a video for an on-screen display,
An image display device in which a display form of an image based on the data is specified by accompanying data. 7. The video display device according to claim 5, wherein the reception of the first video data at the input unit is a reception of video data transmitted in an isochronous transfer mode, and the reception of the first video data at the input unit. The video display device receives the video data transmitted in the asynchronous transfer mode. 8. A video output device connected to a predetermined network and outputting video data to the connected network, comprising: an output unit that outputs first and second video data to the network; A video output device comprising: a control unit configured to add, to the second video data, data relating to a video display mode based on the first and second video data. 9. The video output device according to claim 8, wherein the first video data is data of a main video, and the second video data is data of the main video.
A video output device, which is data of a video to be displayed on an on-screen display, and is data on a display format added by the control unit, and instructs a display format of a video to be displayed on the on-screen display. 10. The video output device according to claim 9, wherein the first video data output from the output unit is stream data output in an isochronous transfer mode, and the second video data output from the output unit. Is a video output device for outputting video data in an asynchronous transfer mode. 11. The video output device according to claim 10, wherein the second video data is output from the output unit as data in a descriptor format having a predetermined hierarchical structure, and the control unit is configured to output the predetermined data in the descriptor format. A video output device that controls to arrange the second video data and the data in the display form in a hierarchy of.