JP2001160927A - Tuner, monitor, video and audio playback device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of impairement of installation performance resulting from connecting an antenna wire to a television receiver. SOLUTION: The tuner section and the monitor section of the television receiver are designed to be separate units. The tuner section transmits video and audio signal wirelessly to the monitor section, and the tuner section and the monitor section communicate control data with each other so as to avoid deviation in operation states of the both. Thus, an antenna wire is connected to the tuner section designed to be the separate unit, which selects a channel and transmits the video and audio signals of the selected channel wirelessly to the monitor section. Thus, the monitor section can reproduce video and audio signals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus capable of separating a tuner section and a monitor section in a television receiver. As the monitor unit, it is particularly preferable to use a thin flat display device such as a plasma display and an EL display in addition to the liquid crystal display.

[0002]

2. Description of the Related Art In recent years, a liquid crystal monitor characterized by space saving and power saving along with a decrease in its price has rapidly spread as a monitor for a personal computer screen on a desktop.
It has established itself as a display device next to CRTs, and is now taking over the CRT monitor market. The liquid crystal monitor has become a familiar product for general consumers, and its use as a television receiver utilizing its style has been expanding as well as a PC monitor.

[0003]

Generally, most television receivers have an antenna input terminal on the back or the like, and are almost always connected to an antenna terminal on a house wall by a coaxial cable. With conventional CRT television receivers, because of their heavy weight, they do not move frequently,
It is often left on the wall or in the corner of a room.

On the other hand, a liquid crystal television is much thinner and lighter than a cathode ray tube type, and thus has a high degree of freedom in installation such as being able to be mounted on a wall or mounted on a stand and moved. When a coaxial cable for an antenna is routed to such a liquid crystal television, the good installation property is lost. In addition, there is a demand that wires, such as cords, should not be connected as much as possible in order to impair the interior properties such as the picture frame.

[0005] In response to such demands, for example, there is a video and audio wireless transmission system in which a composite signal and a stereo audio signal are wirelessly transmitted.
The above system inputs a composite signal and a stereo audio signal to a transmitter, and sends video and audio to an LCD television located a few meters away. Things.
Of course, there is a receiver corresponding to the transmitter on the liquid crystal television.

However, in order to receive a broadcast wave and watch a program in this system, it is necessary to use a tuner unit built in the liquid crystal television main body, and eventually an antenna line is extended to the liquid crystal television main body. Of course, if a tuner is built in the VCR placed on a rack, etc., the video and audio selected by the tuner can be input to the above transmitter and transmitted wirelessly. It is necessary to operate the VCR itself, such as using a remote control, and it is not always easy to use.

An object of the present invention is to provide a video and audio reproducing apparatus which does not impair the installation property due to the arrangement of antenna lines, and a tuner section and a monitor section constituting the apparatus.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has an object to separate a tuner section and a monitor section of a television receiver, provide a wireless transmission section in the separated tuner section, and select a selected video. And sound are wirelessly transmitted to the monitor unit to reproduce the video and the sound. Further, control data is exchanged between the tuner section and the monitor section so as to eliminate a deviation between the operation states of both. As a result, an easy-to-use liquid crystal television can be realized without impairing the installation and interior properties due to the routing of the antenna wire.

More specifically, in order to achieve the object of the present invention, in the first invention, the tuner section is a tuner section used for a video and audio reproducing apparatus provided with a tuner section and a monitor section. Means for receiving data transmitted from the monitor unit, means for selecting a broadcast wave in accordance with the data, data indicating that the tuning process has been completed, and the selected video and audio signals. Means for transmitting. In the first invention, a display unit is provided, and when data from the monitor unit is received, the data is displayed by the display unit. Further, an output unit for outputting a signal for controlling an external device based on the data transmitted from the monitor unit is provided. Further, the data is transmitted by being superimposed on the video signal.

[0010] In the second invention, the monitor section is a monitor section used for a video and audio reproducing apparatus having a tuner section and a monitor section, wherein the monitor section receives data transmitted from a remote controller, To the tuner unit, a unit for receiving a video signal, an audio signal and a data signal transmitted from the tuner unit, and a unit for reproducing the video signal and the audio signal. In the second invention, an OSD generation circuit is provided, and an OSD generation circuit is provided based on the data.
It is configured to control and display the SD generation circuit.

[0011] In the third invention, the video and audio reproducing apparatus includes means for receiving data transmitted from the monitor unit, means for selecting a broadcast wave in accordance with the data, and indicating that the tuning processing has been completed. A tuner unit having a unit for transmitting data and the selected video and audio signals; a unit for receiving data transmitted from a remote controller; a unit for transmitting the data transmitted from a remote controller to the tuner unit; A means for receiving data indicating that the tuning process has been transmitted from the unit, the video signal and the audio signal, and a monitor unit having means for reproducing the video signal and the audio signal.

[0012] In the fourth invention, the video and audio reproducing apparatus receives a broadcast wave and transmits a tuned video signal and an audio signal, and a video signal transmitted from the tuned section. A reproducing unit capable of receiving and reproducing an audio signal, data is exchanged between the tuning unit and the reproducing unit, and an operation state of the tuning unit is checked to check the state of the operation by the reproducing unit. The video signal and the audio signal are configured to be reproduced.

According to a fifth aspect of the present invention, the video and audio reproducing apparatus receives a broadcast wave and can transmit a video signal and an audio signal wirelessly, and a signal of the video and audio transmitting means. And a video and audio reproducing means for reproducing the transmitted video signal and the audio signal,
Remote controlling means for remotely controlling the video and audio reproducing means, wherein the video and audio reproducing means receives an instruction from the remote controlling means, and is provided between the video and audio transmitting means and the video and audio reproducing means. Send and receive control data,
The video and audio reproducing unit is configured to check an operation state of the video and audio transmitting unit and reproduce the video signal and the audio signal. In the fifth invention, the video and audio reproducing means transmits the tuning change instruction to the video and audio transmitting means after receiving the tuning change instruction from the remote control means, and After obtaining a response to the change of channel selection, the display is controlled by controlling the OSD generating means of the video and audio reproducing means.

[0014] In the sixth aspect, the video and audio reproducing apparatus receives the broadcast wave and transmits the video and audio signals wirelessly, and receives the video and audio transmitting means signals. And a video and audio reproducing unit for reproducing the video signal and the audio signal, wherein the video and audio transmitting unit and the video and audio reproducing unit mutually confirm the operation state of the video and audio signals. Among the control data transmitted and received between the audio transmitting means and the video and audio reproducing means, the control data transmitted from the video and audio transmitting means to the video and audio reproducing means is the video transmitted from the video and audio transmitting means. It is configured to be transmitted while being superimposed on the signal flyback period.

[0015] In the seventh invention, the video and audio reproducing apparatus receives the broadcast wave, and transmits a video signal and an audio signal by radio, and receives the video and audio signal from the video and audio transmitting means. A video and audio reproducing unit for reproducing the video signal and the audio signal; and the video and audio transmitting unit for mutually confirming an operation state of the video and audio transmitting unit and the video and audio reproducing unit. And means for transmitting and receiving control data between the video and audio reproducing means, and display means provided in the video and audio transmitting means, and the video and audio transmitting means based on the transmission and reception of the control data. It is configured to display the connection state between the video and audio reproducing means on the display means.

In the eighth invention, the video and audio reproducing apparatus receives a broadcast wave, and transmits a video and audio by radio, and a video and audio transmitting means; The video and audio transmitting means and the audio and video reproducing means for reproducing the audio and video transmitting means, and the video and audio transmitting means and the video and audio reproducing means for mutually confirming an operation state of each other. To
Means for transmitting and receiving control data between the video and audio transmission means and the video and audio reproduction means, external video and audio input terminals provided in the video and audio transmission means,
A control signal output terminal provided in the video and audio transmission means; and an external signal source connected to the external input terminal is controlled by a control signal from the control signal output terminal.

In the ninth aspect, the video and audio reproducing apparatus receives the broadcast wave, and retransmits the video and audio by radio, and transmits the video and audio, and receives the signal of the video and audio transmitting means. A video and audio reproducing unit for reproducing the video signal and the audio signal, a remote control unit for remotely controlling the video and audio transmitting unit and the video and audio reproducing unit, and the video and audio transmitting unit and The video and audio reproducing unit receives and receives instructions from the remote control unit, and exchanges control data between the video and audio transmitting unit and the video and audio reproducing unit. The audio reproducing means are configured to mutually confirm and arbitrate the operation state of each other and reproduce the video signal and the audio signal.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings by using some embodiments. FIG. 1 is a schematic diagram showing a first embodiment of a video and audio reproducing apparatus according to the present invention. In the figure, 1 is a tuner unit, 2 is a monitor unit, 3 and 4 are light emitting and receiving units, 5 is a remote controller, 6 is a VTR,
A signal source such as a DVD, and 7 is an antenna.

An example of the internal structure will be described later, and the overall operation will be described first with reference to FIG. In FIG. 1, a broadcast wave received by an antenna 7 is sent to a tuner unit 1, and a predetermined channel is selected. The video signal and the audio signal of the selected channel are transmitted as an optical signal by the light emitting / receiving unit 3. This optical signal may be visible light or invisible light, but here, description will be made on the assumption that infrared light is generally used. The transmitted optical signals of video and audio are received by the light emitting / receiving unit 4 and reproduced by the monitor unit 2 and a speaker (not shown). In addition to the one-way transmission of video and audio signals between the tuner unit 1 and the monitor unit 2, control data is exchanged between them so that the operating states of the tuner unit 1 and the monitor unit 2 can be mutually confirmed. ing. Since this mutual confirmation function is provided, for example, the remote
When a channel switching instruction is issued to the tuner unit 1, the switching instruction is transmitted to the tuner unit 1, but the fact that the tuner unit 1 has successfully switched the channel is transmitted to the monitor unit 2, and the channel is displayed on the OSD of the monitor unit 2. For example, as shown in the figure, the channel number can be displayed on the screen of the monitor unit 2.

The flow of the above time and the operation state of each part will be described with reference to FIG. FIG. 2 is a flowchart showing a normal processing flow of the remote controller, the monitor unit, and the tuner unit. In the figure, when the remote controller 5 issues a channel switching request,
After receiving this, the monitor unit 2 transmits the channel switching request to the tuner unit 1 after the retransmission process and waits for a response. Here, the retransmission processing refers to, for example, processing of amplifying a signal from a remote controller and taking an envelope of the remote control signal through a band-pass filter. The tuner unit 1 receives the channel switching request, specifically performs a channel switching process, and notifies the monitor unit 2 that the process has been normally completed. The monitor unit 2 is in a state of waiting for an answer, and when the answer from the tuner unit 1 has arrived, displays the selected channel on the OSD display.

FIG. 3 is a flowchart showing a processing flow in the case where the line is disconnected between the monitor unit and the tuner unit in the processing flow of the remote controller, the monitor unit, and the tuner unit. When the line is disconnected between the monitor unit 2 and the tuner unit 1, the channel request from the monitor unit 2 is not transmitted to the tuner unit 1, and a response of the normal end is not returned to the monitor unit 2. If there is no response even after waiting for a certain period of time, the monitor unit 2 determines that the channel has not been switched as a timeout and does not perform OSD display or the like.
Alternatively, the monitor unit 2 displays that the channel cannot be switched. As described above, in this embodiment, in addition to the one-way transmission of the video and audio signals, control data can be exchanged between the two, so that the same ease of use as the integrated type can be obtained even with the tuner separated type. Can be realized.

Hereinafter, a specific configuration example of the tuner unit will be described with reference to FIG. 4 and a specific configuration example of the monitor unit will be described with reference to FIG. FIG. 4 is a block diagram showing a first embodiment of the tuner unit according to the present invention. In the figure, an antenna 7 and a signal source 6 are connected to a tuner 101. In the tuner section, 10 is a tuner, 11 is a video detection circuit,
12 is an audio detection circuit, 13 is an audio multiplex demodulation circuit, 14 is a switching circuit, 15 is a control circuit, 16 to 18 are modulation circuits,
9 is an addition circuit, 20 is a light emitting means, 21 is a light receiving means, 22
Is a filter circuit, and 23 is a demodulation circuit.

The broadcast received by the antenna 7 is channel-selected by the tuner 10, and the intermediate frequency is sent to the video detection circuit 11 and the audio detection circuit 12. Video detection circuit 11
Then, a composite video signal is detected and output from the input intermediate frequency and input to the switching circuit 14. Voice detection circuit 1
In step 2, the audio signal is detected and output from the input intermediate frequency, and input to the switching circuit 14 via the audio multiplex demodulation circuit 13. The audio multiplex demodulation circuit 13 outputs stereo audio and the like. The switching circuit 14 switches between a video / audio signal input from the antenna 7 and a video / audio input from the signal source 6 connected to the outside of the tuner unit 101. The switching control signal is input from the control circuit 15. The control circuit 15 can be constituted by a microcomputer, and in addition to switching control of the switching circuit 14, performs channel selection control in the tuner 10, and performs demodulation instruction in the audio multiplex demodulation circuit.

The video signal switched by the switching circuit 14 is modulated by the modulation circuit 16, and the audio signal is modulated by the modulation circuit 17 and input to the addition circuit 19. The modulation circuit 16 and the modulation circuit 17 are, for example, “Infrared space analog video transmission system” EIAJ CP-1207 and “Infrared space analog audio transmission system” EIAJ CP of the Japan Electronics Machinery Association standard.
FM modulation may be performed in accordance with -1206. The subcarrier frequency allocation is also the same as the "Electronic Space Transmission System Subcarrier Frequency Allocation" EIAJ
The frequency determined by CP-1205 may be used. Incidentally, the frequency allocation is as shown in FIG. 6, which will be described later. The video signal is in band V, and the audio signal is in band IV.
It is decided to.

On the other hand, the modulation circuit 18 modulates the data signal from the control circuit 15 and inputs the data signal to the addition circuit 19. The addition circuit 19 adds the outputs of the modulation circuits 16 to 18 and inputs the result to the light emitting means 20. The light emitting means 20 may be a light emitting diode or the like, and an optical signal whose luminance is modulated by the output of the adder circuit 19 is radiated to the space. It goes without saying that video, audio and data signals are multiplexed on this optical signal.

FIG. 5 is a block diagram showing a second embodiment of the monitor section according to the present invention. In the monitor unit 102 in FIG. 5, 30 is a light receiving means, 31 to 33 are filter circuits,
4 to 36 are demodulation circuits, 37 is a video processing circuit, 38 is a video synthesis circuit, 39 is an OSD generation circuit, 40 is a display unit, 41 is an audio processing circuit, 42 is a speaker, 43 is a light receiving means, 44 is a filter circuit, 45 is a demodulation circuit, 46 is a control circuit, 47 is a modulation circuit, and 48 is a light emitting means. In addition, 50 is a remote controller.

In the monitor section 102, the image is obtained by the light receiving means 30.
The multiplexed audio and data signals are received, and separated into video, audio, and data systems by the filter circuits 31 to 33, and input to the demodulation circuits 34 to 36, respectively.
The demodulation circuit 34 demodulates the FM-modulated video signal corresponding to the modulation circuit 16 and outputs the video signal. Demodulation circuit 3
In step 5, the audio signal FM-modulated according to the modulation circuit 17 is demodulated and an audio signal is output. The demodulation circuit 36 demodulates the data signal corresponding to the modulation circuit 18 and outputs the data signal.

The video signal output from the demodulation circuit 34 is
The video processing circuit performs signal processing for display on the display unit 40. Although not shown, for example, a composite signal is separated into a luminance signal and a chrominance signal, color-demodulated by a video chroma decoder circuit, converted into RGB primary color signals, and enlarged in accordance with the display resolution of the display unit. These series of processes are general processes in a CRT receiver.
The output of the video processing circuit 37 is synthesized with the OSD signal generated by the OSD generation circuit 39 by the video synthesis circuit 38 and input to the display unit 40. The OSD display is a function of displaying a channel number on a screen, and has been generalized.

The audio processing circuit 41 is a block for controlling the amplification of the audio signal from the demodulation circuit 35, left / right balance, sound quality adjustment, and the like.
Drive. The control circuit 46 controls the video processing circuit 37, the audio processing circuit 41, and the OSD generation circuit 39. The video processing circuit 37 is instructed to adjust, for example, the contrast, brightness, hue, and saturation of the video signal. For the audio processing circuit 41, the volume, the left / right balance,
Perform sound quality adjustment instructions. OSD for the OSD generation circuit 39
Instruct the contents of SD occurrence. The control circuit 46 may be constituted by a microcomputer.

Needless to say, the user views the image on the display unit 40 and the sound on the speaker system 42.

On the other hand, a signal from the remote controller 50 is received by the light receiving means 43, and its output is filtered by a filter circuit 44 only in a frequency band corresponding to the sub-carrier frequency of the remote controller 50, and a data signal is reproduced by a demodulation circuit 45. I do. The reproduced data is interpreted by the control circuit 46 and an instruction from the remote controller 50 is executed. The instruction from the remote controller 50 is, for example, volume adjustment or contrast adjustment, and may be issued to the video processing circuit 37 and the audio processing circuit 41 in the manner described above. The control circuit 46 can emit data to the tuner unit 101 via the modulation circuit 47 and the light emitting means 48, and is an upstream control data line from the monitor unit 102 to the tuner unit 101. An example of the frequency distribution of the video signal, audio signal, and downstream data signal emitted by the light emitting means 20 and the upward data signal emitted by the light emitting means 48 will be described with reference to FIGS.

FIG. 6 is a characteristic diagram showing one embodiment of frequency allocation of subcarriers, and FIG. 7 is a characteristic diagram showing another embodiment of frequency allocation of subcarriers. The horizontal axis indicates the subcarrier frequency (Hz). I will show you. 6 and 7, it is common to use band V for video, band IV for audio, and band I for the remote controller 50, and only the assignment of uplink data and downlink data is different.
Here, the upstream data is data transmitted from the monitor unit 2 to the tuner unit 1 in FIG. 1, and the downstream data is data transmitted from the tuner unit 1 to the monitor unit 2 in FIG.

In FIG. 6, uplink data and downlink data are bands.
Assigned to III. High-speed data transmission is possible,
There is a merit that it is hard to interfere with the sub-carrier frequency of the remote controller 50. However, since it is close to the frequency band of video and audio, it is necessary to sufficiently suppress spurious of the data signal. In FIG. 7, uplink data and downlink data are assigned to band I. In this case, it is necessary to devise a code assignment or the like so as not to cause interference with the subcarrier frequency of the remote controller 50, but the modulation / demodulation device can be a general-purpose product used in the existing remote controller, and can be realized at low cost.

As described above, an antenna line is connected to the separated tuner unit 101 to select a channel, the selected video and audio are wirelessly transmitted, and received by the monitor unit 102 to reproduce the video and audio. In this way, an easy-to-use liquid crystal television can be realized without impairing the installation property and the intellectual property due to the routing of the antenna wire. In addition, by exchanging control data between the tuner unit 101 and the monitor unit 102, it is possible to eliminate a shift between both operation states.

A second embodiment of the video and audio reproducing apparatus according to the present invention will be described below with reference to FIGS.
FIG. 8 is a block diagram showing a second embodiment of the tuner unit according to the present invention. 8 includes a video signal generation circuit 51, a data synthesis circuit 52, a video signal detection circuit 53, and a control circuit 115. The same blocks as in FIG. 4 are assigned the same numbers.

The feature of this embodiment resides in that the downlink data is transmitted while being superimposed on the video signal blanking period. This point will be mainly described, and the description of the contents described in FIG. 4 will be omitted. 8 synthesizes the video signal switched by the switching circuit 114 and the control data from the control circuit 115. In the modulation circuit 16, the video signal and the control data superimposed on the video signal are subjected to video FM modulation. The audio signal FM-modulated by the modulation circuit 17 and the output of the modulation circuit 16 are added by the addition circuit 119 and emitted to the space by the light emitting means 20. As described above, the downlink data is modulated together with the video signal after being superimposed on the video signal, instead of modulating the data itself as shown in FIG.

FIG. 10 shows a circuit configuration example of the data synthesizing circuit 52, which will be described. FIG. 10 is a block diagram showing one embodiment of the data synthesizing circuit. In the figure, 6
0 is a clamp circuit, 61 is a reference power supply, 62 and 63 are switching circuits, 64 is a reference power supply, 65 is a synchronization separation circuit, 66 is a control circuit, 67 is a PLL circuit, 68 is an AND circuit, and 69 is a parallel / serial (P / S).

The video signal applied to the terminal 80 is input to the clamp circuit 60 and the sync separation circuit 65. The clamp circuit 60 is a circuit for performing DC reproduction of the video signal, and the video signal clamp level has the value of the reference power supply 61. It is clamped at the timing of the clamp signal from the control circuit 66.
The horizontal synchronizing signal H and the vertical synchronizing signal V separated from the video signal by the synchronizing separation circuit 65 and the clock signal generated by multiplying the horizontal synchronizing signal by the PLL circuit are input to the control circuit 66. In addition, a data load signal (denoted as an LD signal) and a gate signal (denoted as a Gate signal) for the P / S circuit 69 are generated.

The description will be given with reference to the timing chart of FIG. 12 for easy understanding. FIG. 12 is a signal waveform diagram for explaining superposition and separation of data on a video signal. FIG. 12A is a signal waveform diagram of a tuner unit.
FIG. 12B is a signal waveform diagram of the monitor unit. FIG.
3A shows a waveform diagram of an output signal of the clamp circuit 60, wherein 251 is a horizontal synchronizing signal, and 252 is a video signal. (2) is an LD signal 253 output from the control circuit 66, and the P / S circuit 69 outputs the LD signal 253.
At the timing of. (3) is a Gate signal 254 output from the control circuit 66. The Gate signal 254 is supplied to the switching circuit 62,
During the period of the e signal 254, a clock signal is supplied to the P / S circuit 69. (4) shows the signal state inside the P / S circuit 69. The state of the P / S circuit 69 is switched by the LD signal 253, and during the period of the Gate signal 254, the data is changed from parallel to serial by the clock signal. Is converted to (5) is an output signal of the P / S circuit 69, which is data 255 converted into a serial signal. (5) is an output signal of the data synthesis circuit 52, that is, a signal of the terminal 81. In this signal, a part of the output signal of the clamp circuit 60 shown in (1) is replaced with a Gate signal 254, and serially converted data 255 is superimposed on that part.

More specifically, the output of the clamp circuit 60 in FIG. 10 corresponds to the (1) clamp output waveform in FIG. While the Gate signal 254 is L (low), the switching circuit 62 is connected to the output terminal L of the clamp circuit 60. When the Gate signal 254 is H, the switching circuit 62 is connected to the terminal H and the reference power supply 61
Is output. This is to prevent any signal or noise from being mixed into a portion of the output of the clamp circuit 60 where data is superimposed.

Data is latched in the P / S circuit 69 at the LD signal timing, and the data latched while the Gate signal is "H" is converted into serial data and output. The switching circuit 63 is repeatedly turned on and off by the serial data output from the P / S circuit 69. The period during which the switching circuit 63 is repeatedly turned on and off is G
ate signal is “H (high)” only. Therefore, the data is superimposed on the position of the line number 17 like the data composite output waveform of (1) in FIG.

As described above, the data can be superimposed on the video signal by the data synthesizing circuit 52 shown in FIGS. If a video signal is not input to the data synthesizing circuit 52, data superimposition becomes impossible. If there is no video signal, the switching circuit 114 selects the video signal generating circuit 51 and forcibly selects a video signal. The signal is input to the data synthesis circuit 52. The presence / absence of a video signal is determined by a video signal detection circuit 53, and the determination result is sent to the control circuit 11
5 may be input. Although not shown, the video signal detection circuit 53 may use, for example, a synchronization separation circuit, and may integrate the separated horizontal synchronization signal H and determine whether the integration result is equal to or greater than a certain value.

Next, the monitor section 202 shown in FIG. 9 will be described. FIG. 9 is a block diagram showing a second embodiment of the monitor unit according to the present invention. 9, the monitor section 202 includes a data separation circuit 54, a synchronization separation circuit 55, and a control circuit 146. In addition, the same blocks as those in FIG. In FIG. 5, the video signal on which the data is superimposed is output from the demodulation circuit 34, the data superimposed on the video signal is separated by the data separation circuit 54, and the data is input to the control circuit 146. In FIG. 9, the description of the contents of the blocks described in FIG. 5 is omitted.

Next, an example of the circuit configuration of the data separation circuit will be described with reference to FIG. FIG. 11 is a block diagram showing one embodiment of the data separation circuit. In FIG. 11, 7
0 is a clamp circuit, 71 is a reference power supply, 72 is a comparison circuit,
73 is a comparison power supply, 74 is a synchronization separation circuit, 75 is a control circuit, 76 is a PLL circuit, 77 is an AND circuit, and 78 is a switching circuit.

The video signal on which the data applied to the terminal 82 is superimposed is input to the clamp circuit 70 and the synchronization separation circuit 74. The clamp circuit 70 is a circuit that performs DC reproduction of a video signal.
Value. The clamp circuit 70 is clamped at a clamp signal timing from the control circuit 75. Control circuit 75
The horizontal synchronization signal H and the vertical synchronization signal V separated from the video signal by the synchronization separation circuit 74 and the horizontal synchronization signal are
A clock signal generated by multiplication by the L circuit 76 is input. The control circuit 75 includes, in addition to the clamp signal described above,
A gate signal (referred to as a Gate signal) for the switching circuit 78 is generated. The output of the clamp circuit 70 is input to the comparison circuit 72, and is binarized using the level of the comparison power supply 73 as a threshold. Note that the description will be made with reference to the waveform diagram of FIG.

In FIG. 12B, (1) shows an output waveform of the clamp circuit 70, in which data 255 is superimposed on a video signal. (2) is an output waveform of the comparison circuit 72, which is obtained by binarizing the output waveform of the clamp circuit 70 with the power supply of the comparison power supply 73 as a threshold value.
52 and data 255 are included. (3) is Gat
e signal 256, which is supplied to the switching circuit 78.
(4) is data 255 taken out to the terminal 83.
The output waveform of the comparison circuit 72 shown in FIG.
At one end H. G of the control circuit 75 shown in (3)
The ate signal 256 switches the switching circuit 78 to the terminal L when the signal is L (low), and switches the switching circuit 78 to the terminal H when the signal is H (high). Therefore, the output of the switching circuit 78 becomes the output of the comparison circuit 72 while the Gate signal is "H (high)", and the data 255 shown in (4) is separated and output to the terminal 83. Thus, the data 255 superimposed on the video signal can be separated by the data separation circuit 54. Note that the output of the data separation circuit 54 is input to the control circuit 146, and the data content is interpreted.

Next, in the second embodiment, the light emitting means 20
An example of the frequency distribution of the video signal, the audio signal, the downstream data signal and the upstream data signal emitted by the light emitting means 48 will be described with reference to FIGS. Figures 13-1
5 is a characteristic diagram showing still another embodiment of frequency allocation of subcarriers, where the horizontal axis indicates the subcarrier frequency (Hz). In FIGS. 13 to 15, it is common to use band V for video data superimposed, band IV for audio, and band I for remote control, and only the allocation of uplink data differs. In FIG. 13, uplink data is assigned to band III, and downlink data is superimposed on a video signal and assigned to band V. With this frequency allocation, high-speed data transmission is possible, and there is an advantage that interference with a subcarrier of the remote controller 50 is unlikely. However, since it is close to the frequency band of video and audio, it is necessary to sufficiently suppress spurious of the data signal.

In FIG. 14, the upstream data is assigned to band I, and the downstream data is superimposed on the video signal. In this frequency assignment, it is necessary to devise a code assignment or the like so as not to cause interference with the subcarrier of the remote controller 50. However, the modulation / demodulation device is a general-purpose product used in the existing remote controller, and can be realized at low cost.

In FIG. 15, the upstream data is allocated to the same band V as the video signal. The downstream data is superimposed on the video signal. In this frequency assignment, since the uplink data is in the opposite direction to the video signal, there is little interference. However, this is achieved by using a time division method such as setting the timing of transmitting the uplink data to, for example, the period of line 18 in FIG. The effect of interference can be further reduced.

In FIG. 9, the horizontal synchronizing signal H and the vertical synchronizing signal V are input to the control circuit 146 by using the synchronizing separation circuit 55 because they are used as timing pulses when the above-described time-division method is implemented. It is.

As described above, the antenna 7 is connected to the separated tuner unit 1 to select a channel, the selected video signal and audio signal are transmitted wirelessly, and received by the monitor unit 2 to receive the video signal and audio signal. By reproducing the signal, an easy-to-use liquid crystal television can be realized without impairing the installation property and the intellectual property due to the routing of the antenna wire.

Third Embodiment of Video and Audio Reproducing Apparatus According to the Present Invention
The embodiment will be described with reference to FIG. FIG. 16 is a block diagram showing a third embodiment of the tuner unit according to the present invention. In the tuner unit 301 of FIG. 16, a display unit 90 is added to the configuration of the tuner unit 101 of FIG.
5, and the same blocks as those in FIG. 4 are denoted by the same reference numerals. The feature of the present embodiment is that the line connection state between the tuner 1 and the monitor 2 is displayed based on the uplink data received from the monitor 2 via the light receiving means 21.

In FIG. 1, when the tuner unit 1 is installed, the light emitting unit 3 is directed to the monitor unit 2, but it is difficult to determine whether the direction is correct. Therefore, by displaying the reception of the return data signal from the monitor unit 2 on the display unit 90, it is possible to confirm that the installation direction of the tuner unit 1 is correct. In addition, description of the contents described in FIG. 4, such as signal processing, is omitted. According to the present embodiment, the installation work becomes easy, and the usability for the user can be improved.

The fourth embodiment of the video and audio reproducing apparatus according to the present invention
Will be described with reference to FIG. FIG. 17 is a block diagram showing a fourth embodiment of the tuner unit according to the present invention. In FIG. 17, a control signal output terminal 91 is added to the configuration of the tuner unit 101 in FIG. 4 so that the external signal source 106 can be controlled by the control circuit 215. The description is omitted here.
The feature of this embodiment is that the external signal source 106 is based on the uplink data received from the monitor 2 via the light receiving unit 21.
Can be operated by the remote controller 5.

In FIG. 1, for example, the control of the signal source 6 such as reproduction and stop of the VTR is performed by the remote controller 5, and the usability of the user can be remarkably improved. A control instruction from the remote controller 5 is transmitted to the tuner unit 401 via the monitor unit 1, and is input to the control circuit 315 via the light receiving unit 21, the filter 22, and the demodulation circuit 23. In the control circuit 315,
Based on a control instruction from the remote controller 5, a control signal for the signal source 106 is generated and output to the control signal output terminal 91. The connection between the control signal output terminal 91 and the signal source 106 may be wired if the signal source 106 has a control signal input terminal. When the signal source 106 does not have a control signal input terminal, for example, a device for converting a control signal output into an infrared signal may be provided in the tuner unit 401 and installed near the remote control light receiving window of the signal source 106. As an apparatus for converting the control signal output into an infrared signal, for example, a satellite broadcasting receiving set CS-SP80S made by Hitachi, Ltd. (SkyPerfect TV!
A video controller of the reception set catalog '98 -12) may be used. This video controller or equivalent is commercially available and is generally well known. FIG. 4 shows other signal processing of the tuner unit 401 and the like.
The description of the contents described above is omitted. According to the present embodiment, the external signal source can be controlled by the remote control for the monitor unit, and the usability for the user can be improved.

The fifth embodiment of the video and audio reproducing apparatus according to the present invention
Will be described with reference to FIG. FIG. 18 is a schematic diagram showing a fifth embodiment of the video and audio reproducing apparatus according to the present invention. In FIG. 18, the light receiving process of the remote
That is, the tuner unit 501 can also perform the processing. The specific configuration of the tuner section 501 may be the same as that of FIG. 1, and code information of the remote controller may be added so that the control circuit 15 of FIG. 4 can perform signal processing of the remote controller 5. Other details such as signal processing are the same as those described in the first embodiment, and thus description thereof is omitted.

According to this embodiment, not only the monitor section,
The tuner section can also receive the signal of the remote controller 5, and the usability of the user can be improved. According to the present invention, a tuner section and a monitor section of a receiver such as a liquid crystal television are separated, a video signal and an audio signal are transmitted from the tuner section to the monitor section, and control data is exchanged between the tuner section and the monitor section. Was performed to eliminate the difference between the two operating states. As a result, it is possible to connect the antenna line to the separated tuner unit to select a channel, and wirelessly transmit the selected video signal and audio signal to the monitor unit to reproduce the video signal and the audio signal. It is possible to realize an easy-to-use video and audio reproducing device without impairing the installation and interior characteristics due to the routing of the device.

[0058]

According to the present invention, the selected video signal and audio signal can be wirelessly transmitted to the monitor section to reproduce the video signal and the audio signal, so that the installation property due to the routing of the antenna line is not impaired.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a first embodiment of a video and audio reproducing apparatus according to the present invention.

FIG. 2 is a flowchart showing a normal processing flow of a remote controller, a monitor unit, and a tuner unit.

FIG. 3 is a flowchart showing a processing flow when a line is disconnected between the monitor unit and the tuner unit in the processing flow of the remote controller, the monitor unit, and the tuner unit;

FIG. 4 is a block diagram showing a first embodiment of a tuner unit according to the present invention.

FIG. 5 is a block diagram showing a second embodiment of the monitor unit according to the present invention.

FIG. 6 is a characteristic diagram showing one embodiment of frequency allocation of subcarriers.

FIG. 7 is a characteristic diagram showing another embodiment of frequency allocation of subcarriers.

FIG. 8 is a block diagram showing a second embodiment of the tuner unit according to the present invention.

FIG. 9 is a block diagram showing a second embodiment of the monitor unit according to the present invention.

FIG. 10 is a block diagram showing one embodiment of a data synthesis circuit.

FIG. 11 is a block diagram showing one embodiment of a data separation circuit.

FIG. 12 is a signal waveform diagram for describing superimposition and separation of data on a video signal.

FIG. 13 is a characteristic diagram showing still another embodiment of frequency allocation of subcarriers.

FIG. 14 is a characteristic diagram showing still another example of frequency allocation of subcarriers.

FIG. 15 is a characteristic diagram showing still another example of frequency allocation of subcarriers.

FIG. 16 is a block diagram showing a third embodiment of the tuner unit according to the present invention.

FIG. 17 is a block diagram showing a fourth embodiment of the tuner unit according to the present invention.

FIG. 18 is a schematic view showing a fifth embodiment of the video and audio reproducing apparatus according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tuner part, 2 ... Monitor part, 3 ... Transmission / reception part, 4 ... Transmission / reception part, 5 ... Remote control, 6 ... Signal source, 7 ... Antenna, 1
0: Tuner circuit, 11: Video detection circuit 12: Audio detection circuit, 13: Audio multiplex demodulation circuit, 14: Switching circuit, 1
5, 46 ... control circuit, 16, 17, 18, 47 ... modulation circuit, 19 ... addition circuit, 20, 48 ... light emitting means, 21, 3
0, 43 ... light receiving means, 22, 31, 32, 33, 44 ...
Filters, 21, 34, 35, 36, 45 ... demodulation circuits,
37 video processing circuit, 38 synthesis circuit, 39 OSD generation circuit, 40 display unit, 41 audio processing circuit, 4
2. Speaker system.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masato Sugiyama 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Digital Media Development Division, Hitachi, Ltd. (72) Inventor Toshiyuki Ohara 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Address F-term in Hitachi Digital Media System Division (Reference) 5C025 AA03 AA08 AA09 AA10 AA25 AA29 BA21 BA28 CA03 CA09 CA15 DA10 5C063 AB07 AB20 AC01 AC05 AC10 CA14 DA07 DA13

Claims (14)

[Claims] 1. A tuner section for use in a video and audio reproducing apparatus provided with a tuner section and a monitor section, comprising: means for receiving data transmitted from the monitor section; and selecting a broadcast wave according to the data. A tuner unit comprising: a unit for performing tuning; and a unit for transmitting data indicating that the tuning process has been completed and transmitting the selected video and audio signals. 2. The tuner unit according to claim 1, further comprising a display unit, wherein when the data from the monitor unit is received, the data is displayed by the display unit. 3. The tuner unit according to claim 1, further comprising an output unit for outputting a signal for controlling an external device based on the data transmitted from the monitor unit. 4. A tuner unit according to claim 1, wherein said data is superimposed on a video signal and transmitted. 5. A monitor unit for use in a video and audio reproducing apparatus including a tuner unit and a monitor unit, wherein the unit receives data transmitted from a remote controller, and the unit transmits the data to the tuner unit. And a means for receiving a video signal, an audio signal, and a data signal transmitted from the tuner section, and a means for reproducing the video signal and the audio signal. 6. The monitor according to claim 5, wherein:
A monitor unit provided with a D generating circuit, and controlling and displaying an OSD generating circuit based on the data. 7. A means for receiving data transmitted from a monitor unit, a means for selecting a broadcast wave in accordance with the data, data indicating that the tuning process has been completed, and the selected video and audio signals. A means for receiving data transmitted from a tuner unit and a remote controller having a means for transmitting a signal, a means for transmitting the data transmitted from a remote controller to the tuner unit, and the tuning process transmitted from the tuner unit has been completed. And a monitor section having means for receiving the video signal and the audio signal, and means for reproducing the video signal and the audio signal. 8. A tuning unit capable of receiving a broadcast wave and transmitting a selected video signal and audio signal, and receiving and reproducing the video signal and the audio signal transmitted from the tuning unit. A reproducing unit capable of transmitting and receiving data between the tuning unit and the reproducing unit, and confirming an operation state of the tuning unit to reproduce the video signal and the audio signal by the reproducing unit. A video and audio playback device characterized by the following. 9. A video and audio transmitting means capable of receiving a broadcast wave and wirelessly transmitting a video signal and an audio signal, and receiving the signal of the video and audio transmitting means and transmitting the transmitted video signal. A video and audio reproducing unit for reproducing the audio signal, and a remote control unit for remotely controlling the video and audio reproducing unit, wherein the video and audio reproducing unit receives an instruction from the remote control unit, Control data is transmitted and received between the audio transmitting means and the video and audio reproducing means, and the video and audio reproducing means reproduces the video signal and the audio signal after confirming the operation state of the video and audio transmitting means. And a video and audio reproducing apparatus. 10. A video and audio reproducing apparatus according to claim 9, wherein said video and audio reproducing means receives said tuning change instruction from said remote control means, and then instructs said video and audio transmitting means to said tuning change instruction. And a display for controlling the OSD generating means of the video and audio reproducing means to perform display after receiving a response to the change of channel selection from the video and audio transmitting means. . 11. A video and audio transmitting means for receiving a broadcast wave and wirelessly transmitting a video signal and an audio signal, receiving a signal from the video and audio transmitting means, and reproducing the video signal and the audio signal. Video and audio reproducing means, and the video and audio transmitting means and the video and audio reproducing means mutually confirm the operation state of each other. The control data transmitted and received between the video and audio transmitting means to the video and audio reproducing means among the control data transmitted and received between the transmitting and receiving sections is superimposed on the retrace period of the video signal transmitted from the video and audio transmitting means and transmitted. A video and audio reproducing apparatus characterized by the above-mentioned. 12. A video and audio transmitting means for receiving a broadcast wave and wirelessly transmitting a video signal and an audio signal, receiving a signal from the video and audio transmitting means, and reproducing the video signal and the audio signal. Video and audio reproducing means, and the video and audio transmitting means and the video and audio reproducing means are controlled between the video and audio transmitting means and the video and audio reproducing means in order to mutually confirm the operation state of each other. Means for transmitting and receiving data, and display means provided in the video and audio transmission means, based on the transmission and reception of the control data,
A video and audio reproducing apparatus, wherein a connection state between the video and audio transmitting means and the video and audio reproducing means is displayed on the display means. 13. A video and audio transmitting means for receiving broadcast waves and wirelessly transmitting video and audio, receiving a signal from said video and audio transmitting means, receiving said video and audio transmitting means and said audio and video signals. A video and audio reproducing means for reproducing the video and audio transmitting means, and the video and audio transmitting means and the video for confirming each other's operation state of the video and audio transmitting means and the video and audio reproducing means. Means for transmitting and receiving control data between the audio and video reproduction means, an external video and audio input terminal provided in the video and audio transmission means, and a control signal output terminal provided in the video and audio transmission means. A video and audio reproducing apparatus, comprising: an external signal source connected to the external input terminal; and a control signal from the control signal output terminal. 14. A video and audio transmitting means for receiving a broadcast wave and retransmitting video and audio wirelessly, receiving a signal from said video and audio transmitting means, and reproducing said video signal and said audio signal. Video and audio playback means, comprising the video and audio transmission means and remote control means for remotely controlling the video and audio reproduction means, wherein the video and audio transmission means and the video and audio reproduction means are transmitted from the remote control means , The control data is exchanged between the video and audio transmission means and the video and audio reproduction means, and the video and audio transmission means and the video and audio reproduction means mutually A video and audio reproducing apparatus for reproducing the video signal and the audio signal after confirmation and arbitration.