CN1144214C - Method of selecting channel, optical recording and reproducing apparatus - Google Patents

Abstract

A method of allocating a channel Identifier of an audio signal, a method of selecting an audio channel using the same, and apparatuses suitable for the same are provided. The method selects an audio channel comprising a plurality of a/V data streams of programs, each program comprising at least two audio data streams, each audio data stream comprising at least two non-repeating secondary audio data streams having a sequence of IDs corresponding to predetermined priorities, comprising the steps of: (a) searching for whether there is an auxiliary audio stream having the same channel ID as that of the auxiliary audio stream assigned to the reproduction program before the change in the changed program when the one program is changed to the other program; (b) selecting the secondary audio data stream when it is determined in step (a) to be present.

Description

Method for selecting channel, optical recording and reproducing apparatus

technical field

The present invention relates to a method of assigning an audio channel identifier (identification, ID), by which method, when a program or audio data stream is used to reproduce a program containing multiple audio data streams on an audio/video (A/V) device The audio channel selected by the user can be tracked and selected when the medium is changed, and the present invention also relates to a method for selecting an audio channel using this method and an optical recording and reproducing apparatus suitable for them.

Background technique

Currently, the moving picture engineering group (MPEG) and AC3 are often used as methods for compression-encoding audio signals. In linear pulse code modulation (PCM), the audio signal is not compressed but recorded as it is. In digital A/V devices such as digital TV broadcasting or video CDS and digital video disk (DVD), MPEG is mainly used.

When encoded data streams of MPEG A/V data and other data streams are combined and applied to practical applications, it is necessary to generate one data stream by combining these data streams. Depending on the specific application, auxiliary data may also be used. The role of the MPEG system is to synchronize and multiplex video and audio data.

In the MPEG system, multiplexing is performed using packets. When multiplexing with packets, each video and audio data is divided into multiple data streams called packets, these packets have an appropriate length, information such as headers are attached to the packets, and these video and audio data The packets are multiplexed.

A packet includes information for identifying whether a data item is video or audio data in an area called a packet header, as shown in FIG. 1 . The length of the packet depends on the transmission medium or application.

Table 1 is used to show the contents of the packet header shown in FIG. 1 .

Table 1 main project Packet_start_code_prefix "00 00 01"h stream_id 1 byte, used to distinguish the type of data item PTS value (DTS value) data Video data, MPEG audio data or private data

In Table 1, Packet_start_code_prefix indicates the start of the packet, and stream_id indicates the data item type in the packet. For example, in the case of video data, stream_id is binary code "1110 0000"b. In the case of audio data, stream_id is binary code "1100 0 ^*** "b. Here, ^*** indicates eight data streams that may exist from 000b to 111b. In the MPEG system, data items other than these two data items are defined as private data streams. Code "10111101"b is available for private data streams.

The presentation time stamp (PTS) and decoding time stamp (decoding time stamp, DTS) defined in the MPEG system standard represent the time at which the display unit in the video or audio data is output and decoded, respectively. A display unit is a frame of a picture in video data and a frame of audio in audio data. In the case of audio data, DTS is not required.

In addition to MPEG audio data, audio data such as AC3 or LPCM is implemented as a dedicated data stream. Table 2 shows the content of the packet header used by the dedicated data stream.

Table 2 main project Packet_start_code_prefix "00 00 01" h stream_id "1011 1101" h PTS value substream_id AC3 or LPCM number_of_audio_channels number of audio channels data

In Table 2, substream_id is used to distinguish audio data encoding types such as AC3 or LPCM. For example, in the case of AC3, substream_id is "1010 0 ^*** "b. Here, ^*** represents the eight data streams that exist just like in MPEG audio. In the MPEG system, one program can have various video streams and audio streams.

The term "number_of_audio_channels" indicates the number of channels. There may be 1ch, 2ch, 3ch, 4ch and dual mono channel. The channel here is different from the channel selected by the user. That is, the above channels are viewed as one channel by the user except for the double single channel. Dual single channel is considered two channels.

In an MPEG-1 or MPEG-2 program stream (PS), there is an upper layer of video or audio packets called packs. In summary, a packet formed by combining a plurality of packets is regarded as a basic unit. Figure 2 shows the structure of this package. There is additional information of a time-based reference for synchronous reproduction at the head of the pack.

Table 3 shows the contents of the packet header shown in FIG. 2 .

table 3 main data Packet_start_code "00 00 01 BA" h "01" Description data is MPEG-2 SCR value program_mux_rate pack_stuffing_length

In Table 3, Pack_start_code is the code of the start of pack data. The SCR value represents when the packet data arrives at the decoder's buffer and is used to synchronize the system clock of the encode port with the system clock of the decode port. Progarm_mux_rate represents the transmission rate at which video, audio and private data items are multiplexed and transmitted. In order for data to be decoded correctly, these data must be transmitted at a higher transfer rate than stated. Pack_stuffing_length represents the number of dummy data.

Fig. 3 schematically shows each channel and its corresponding audio signal. As shown in FIG. 3, the audio signal is output through the decoder. Data with dual single channels output, ie audio data of CH0 and audio data of CH1 is similar to 2ch data. However, the double single data is different from the 2ch data in that the left and right audio signals in the 2ch data are associated with each other, whereas CH0 and CH1 in the double single data are independent audio signals.

For example, in dual mono channel, Korean audio data can be loaded to CH0 and English audio data can be loaded to CH1. Therefore, usually only one of the two channels is output, or CH0 audio data and CH1 audio data are output through the left speaker and the right speaker, respectively.

FIG. 4 shows a device for decoding and outputting data of a dual single channel. When the selection signal is 0, the device shown in FIG. 4 outputs CH0 audio as left audio and right audio. When the selection signal is 1, the device outputs CH1 audio as left audio and right audio. When the selection signal is 2, the device outputs CH1 and CH2 audio as left audio and right audio respectively.

FIG. 5 schematically shows a method of recording or reproducing a multi-speech audio signal as double single audio data. A multi-speech audio signal is formed of main audio data and sub audio data. When data is recorded, main audio data and sub audio data are encoded into an audio data stream by a multi-vocoder. At the same time, main audio data is encoded as CH0 audio data and sub audio data is encoded as CH1 audio data.

When the data is reproduced, the audio data stream is decoded into CH0 audio data and CH1 audio data by the multi-voice decoder. CH0 audio data is main audio data and CH1 audio data is sub audio data.

Here, it is assumed that there are a plurality of audio data streams. For example, when there are two audio data streams in the A/V data stream, the user can select one of the two channels. When the selected audio data stream is dual single data, that is, when the sub audio data stream is included, the user can select two channels.

Contents of the invention

An object of the present invention is to provide a method for distributing channel identifiers (IDs) to Method of sub audio stream included in audio stream.

Another object of the present invention is to provide an audio channel selection that can be selected by tracking the user input although the program or audio data in the A/V apparatus for reproducing a plurality of audio data streams that allow dual single mode has changed. methods for audio channels of the same type.

Correspondingly, in order to achieve the above first object, a method for assigning audio channel IDs is provided, wherein, channel ID 2n-1 (n is the priority of the audio data stream, 1, 2, 3, ...) is assigned Assigned to an audio data stream in an audio/video (A/V) data stream, the audio/video (A/V) data stream comprising at least two audio data streams, each of which is in dual single mode.

To achieve the above second object, a method for selecting an audio channel of an A/V data stream is provided, the A/V data stream includes a plurality of programs, each program includes at least two audio data streams, each The audio data stream includes at least two sub-audio data streams that do not repeat and have a series of IDs corresponding to predetermined priorities, and the method includes the steps of: when a program is changed to another program, in the changed program Searching for whether there is a sub audio stream having the same information ID as the channel ID assigned to the sub audio stream of the program being reproduced before the program is changed; When the sub audio stream of the same channel ID as the channel ID of the sub audio stream of the program is selected, the sub audio stream is selected when there is no audio data having the same channel ID assigned to the program being reproduced before the change of the program When the channel ID of the flow is the same as the sub-audio data stream of the channel ID, the method also includes the step of: selecting the sub-audio data stream with the channel selection number of the first priority in the sub-audio data stream of the selected program, when not When there is a sub-audio stream having the same channel ID as the channel ID assigned to the audio stream of the program being reproduced before the program is changed, the method further comprises the step of: searching whether there is such a sub audio stream whose channel ID has a lower priority than that assigned to the channel ID of the sub audio stream of the reproduced program before said program change; and When there is a sub audio stream, select such a sub audio stream from among the sub audio streams of the selected program that the channel ID of the sub audio stream has a higher channel ID than the sub audio stream assigned to the reproduced program before said program is changed The priority of the channel ID of the stream is lower priority.

In order to achieve the above-mentioned third object, an optical recording and reproducing device is provided, which includes: a pick-up unit for picking up an optical signal from a disc; an RF AMP (radio frequency amplifier) for converting said The optical signal generated by the pickup unit is converted into an electrical signal and a servo signal and modulation data are extracted; a digital signal processor for outputting compressed A/V by demodulating the modulation data provided by the RF AMP data stream; a servo unit for receiving information from the RF AMP that is required to control the servo and system controller and perform servo operations; an AV codec (codec) for encoding the digital The compressed A/N data stream provided by the signal processor decodes and outputs an A/V data stream comprising a plurality of audio data streams; a key input unit for inputting a user's key input; and a system controller for passing through The key input unit implements the user interface and controls the pickup unit, the RF AMP, the digital signal processor, and the AV codec, wherein when one program is changed to another, the system control The device searches the program after the change for a sub audio stream having the same channel ID as that assigned to the sub audio stream of the reproduced program before the program change, and selects the channel ID of the sub audio stream assigned to the program after the change. A sub audio stream having the same channel ID as the channel ID of the sub audio stream of the playback program is allocated.

Description of drawings

By describing in detail preferred embodiments of the present invention with reference to the accompanying drawings, the above purpose and advantages of the present invention will become clearer, in the accompanying drawings:

Figure 1 shows the structure of a packet in the MPEG system;

Figure 2 shows the structure of a packet in the MPEG system;

Figure 3 shows the audio signal in each channel;

Fig. 4 shows the example of the device that the data of double single channel is decoded and output;

Fig. 5 schematically shows the method that multi-speech audio signal is recorded and reproduced as double single audio data; and

Fig. 6 is a block diagram showing the structure of an optical recording and reproducing apparatus according to the present invention.

Detailed ways

According to the present invention, in a method of assigning audio channel identifiers (IDs), different channel IDs are assigned to respective audio channels included in a program.

Table 4 shows an example in which channel IDs are assigned to streams when three audio streams are recorded in one program.

Table 4 non-double single double single channel ID channel ID data flow 1 1 CH0 1 CH1 2 data flow 2 3 CH0 3 CH1 4 data flow 3 5 CH0 5 CH1 6

In other cases than the double single case, channel IDs such as 2n-1 (n=1, 2 and 3) are given. At this time, n is the same as the number of data streams. In case of double single, the channel ID 2n-1 is assigned to CH0 and the channel ID is assigned to CH1.

When the user presses an audio change key through a device such as a remote controller, numbers larger than the current reproduction channel ID are sequentially selected and output. When the user selects a channel ID, the audio data stream corresponding to the ID is selected, decoded and output.

According to the present invention, in the audio channel selection method, when the program is changed, the audio channel selected in the previous program is tracked and selected in the next program. Also, when there is no audio channel before the program change, the default audio channel will be selected.

Here, it is assumed that a new data stream is input when data is reproduced. Audio data different from the preceding data stream can be recorded in the new data stream. For example, when a dual mono audio stream is recorded in the previous stream, two non-dual mono audio streams will be recorded in the new stream.

According to the present invention, in the audio channel selection method, when there is data corresponding to a channel ID to be reproduced, the data is selected and reproduced. When there is no corresponding data by default, data corresponding to channel ID-1 is selected and output.

When there is data corresponding to the channel ID being reproduced, the data is selected and reproduced. When there is no corresponding data, and when the current channel is even-numbered, the current channel ID-1 is searched. When there is data corresponding to channel ID-1, the data is selected and output. When the data does not exist, data corresponding to channel ID 1 is selected and output. When there is no corresponding data and the current channel has an odd data number, the data corresponding to channel ID 1 is selected and output.

Table 5 shows another example of combinations of audio data streams.

table 5 program 1 program 2 Data Stream 1 (Dual Single) CH0; Channel ID 1 Data stream 1 (non-dual single) Channel ID 1 CH1; Channel ID 2 Data Stream 2 (Dual Single) CH0; Channel ID 3 Data stream 2 (non-dual single) Channel ID 3 CH1; Channel ID 4

For example, when the user presses the audio change key during the reproduction of program 1, the audio signal is output in CH0 of stream number 1, CH1 of stream number 1, CH0 of stream number 2, and CH1 of stream number 2. order changes.

When program 1 is reproduced by selecting CH0 of stream number 2 with channel ID 3 and the next program 2 is intended to be reproduced, it will be checked whether data of channel ID 3 exists. Since stream 2 corresponding to channel ID 3 exists in program 2, stream 2 is reproduced.

When program 1 is reproduced by selecting CH1 of stream 2 with channel ID 4 and the next program 2 is intended to be reproduced, it will be checked whether data of channel ID 4 exists. Since data corresponding to channel ID 4 does not exist in program 2, stream 1 having channel ID 1 as a default channel is selected and reproduced.

In another preferred method of changing channels, it is checked whether there is a channel ID 3 obtained by subtracting 1 from channel ID 4. When the channel ID exists, the channel ID is selected. When the channel ID does not exist, stream 1 with a channel ID of 1 can be selected and reproduced. In this case, since the data of the channel ID 3 exists, the data of the channel ID 3 is reproduced.

According to the method of the present invention, when the channel ID is an odd number, the channel is a non-dual single channel or the main audio channel in a dual single channel. When the channel ID is an even number, the channel is a sub audio channel in a dual mono channel.

When the user changes the audio channel, it is preferable for the user whether the channel of the audio data is classified as a separate audio data stream or as a dual single channel, the channel will be changed.

According to the audio channel selection method of the present invention, when the audio change key is received, the change from the main audio to the sub audio is performed in the corresponding audio data stream, and the change to the next audio data is performed.

When the user selects an audio channel, the currently selected channel is maintained even if the program is changed.

However, when there is no corresponding audio channel, the channel must be changed to an appropriate channel, and the changed channel must be selected. At this time, the default channel CH0 is selected and reproduced, or the channel closest to the currently selected audio channel is searched for and then reproduced (when the channel ID is an even number, that is, in the case of sub audio data, The main audio channel, odd numbered channel ID-1, can be considered the closest channel).

Also, when there is no audio data stream corresponding to the currently set channel ID, the channel ID is stored, and the basic channel is selected and output by the above-mentioned method, or the latest channel is selected and reproduced, and when the corresponding When the audio data stream of the above channel ID is present, the data is selected and output.

This is achieved when the user selects and reproduces a sub-audio channel, then selects and reproduces another program briefly without sub-audio, and when the program with sub-audio is reproduced, selects and reproduces the original sub-audio . If this is not done, the user must perform changes to reproduce the secondary audio.

Fig. 6 is a block diagram of an optical recording and reproducing apparatus suitable for the present invention. A/V data is recorded and reproduced through a recordable disc. The functions of the optical recording and reproducing apparatus can be divided into recording and reproducing.

In recording data, the AV codec 110 compression-codes an A/V signal received from the outside by a predetermined compression scheme and provides information on the amount of compressed data. A digital signal processor (DSP) 120 receives A/V data supplied from the AV codec 110, distributes additional data for processing an error correction code (ECC), and performs a predetermined modulation scheme Perform modulation. A high frequency amplifier (RF AMP) 130 converts the electrical data provided by the DSP 120 into an optical signal.

The pickup unit 140 includes a driver for recording an optical signal from the RF AMP 130 on an optical disc and performing focusing and tracking. The servo unit 150 receives information required to control the servo from the RFAMP 130 and the system controller 160 and controls the servo.

The system controller 160 controls the entire system, decides an encoding mode of audio data, records data on an optical disc and controls the data.

In reproducing data, the pickup unit 140 picks up an optical signal from a disc storing data. Data is extracted from the optical signal. The RF AMP 130 converts an optical signal from the pickup unit 140 into an electrical signal and extracts a servo signal for controlling servo and modulating data.

The DSP 120 demodulates modulated data of an electrical signal supplied by the RF AMP 130 corresponding to a modulation scheme used to modulate the data, and removes additional data by performing ECC. The servo unit 150 receives information required to control servos from the RF AMP 130 and the system controller 160 and performs servo operations.

The AV codec 110 decodes compressed A/V data supplied from the DSP 120 and outputs an A/V signal.

The system controller 160 executes the user interface, for example, it processes the user's key input through the above method, controls the pickup unit 140, the RF AMP 130, the DSP 120 and the AV codec 110, and analyzes the audio data stream and controls the pickup section 140, The RF AMP 130, the DSP 120, and the AV codec 110 to select and reproduce corresponding audio data when a command for changing an audio channel is received from the key input unit 170.

As described above, according to the channel ID assigning method of the present invention, when audio signals are selected by assigning different channel IDs to the respective channels of the audio data stream, the same channel can be tracked.

According to the audio channel selection method of the present invention, the audio mode selected by the user can be tracked when the program or the audio data stream is changed.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and those skilled in the art can make many modifications and modifications to the present invention within the spirit and scope of the present invention defined by the appended claims.

Claims (2)

1. A method for selecting an audio channel of an A/V data stream, said A/V data stream comprising a plurality of programs, each program comprising at least two audio data streams, each audio data stream comprising at least two non-repeating And there is a secondary audio data stream corresponding to a series of IDs of predetermined priority, the method comprises the following steps: (a) When a program is changed to another program, it is searched in the changed program whether there is a sub with the same channel ID as the channel ID assigned to the sub audio stream of the program being reproduced before the program is changed. audio data stream; and (b) when it is determined in step (a) that there is a sub audio stream having the same channel ID as the channel ID assigned to the sub audio stream of the program being reproduced before the program is changed, selecting the sub audio data flow, Wherein, when there is no sub-audio data stream having the same channel ID as the channel ID assigned to the audio data stream of the program being reproduced before the program is changed, the method further includes the step of: Select the secondary audio data stream with the channel selection number of the first priority in the audio data stream, When there is no sub-audio stream with the same channel ID as the channel ID assigned to the audio stream of the program being reproduced before the program is changed, the method further comprises the steps of: In the sub audio streams of the selected program, it is searched whether there is a sub audio stream whose channel ID is higher than the channel ID assigned to the sub audio stream of the reproduced program before said program is changed. the lower priority; and When there is a sub audio stream, select such a sub audio stream from among the sub audio streams of the selected program that the channel ID of the sub audio stream has a higher channel ID than the sub audio stream assigned to the reproduced program before said program is changed The priority of the channel ID of the stream is lower priority. 2. An optical recording and reproducing apparatus comprising: a pick-up unit for picking up optical signals from a disc; a radio frequency amplifier for converting the optical signal generated by the pickup unit into an electrical signal and extracting a servo signal and modulation data; a digital signal processor for outputting a compressed A/V data stream by demodulating modulated data provided by said radio frequency amplifier; a servo unit for receiving information from said radio frequency amplifier required to control the servo and system controller and for controlling said servo; an AV codec for decoding said compressed A/V data stream provided by said digital signal processor and outputting an A/V data stream comprising a plurality of audio data streams; a key input unit for inputting user's key input; and a system controller for performing a user interface through the key input unit and controlling the pickup unit, the radio frequency amplifier, the digital signal processor and the AV codec, Wherein, when one program is changed to another program, the system controller searches whether there is a sub channel ID identical to a channel ID assigned to a sub audio data stream of a reproduced program before the program change in the changed program. audio stream, and selects the sub audio stream having the same channel ID as the channel ID assigned to the sub audio stream of the reproduced program before said program change in the changed program.

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