KR100346724B1 - Method for selecting of audio channel - Google Patents

Abstract

A / V apparatus for reproducing a program including a plurality of audio data streams relates to a method of selecting an audio channel that allows the user to follow an audio channel selected by a user even if a program or audio data stream is switched.

An embodiment of the audio channel selection method according to the present invention is that if a program of one of the programs is switched to the other of the programs, the audio channel selection method of the audio channel is performed before the programs are switched to the switched program. Searching whether there is a sub audio data stream having a channel identification symbol such as an assigned channel identification symbol; If there is a sub-audio data stream having the same channel identifier as the channel identifier assigned to the sub-audio data stream of the program played before the programs are switched to the switched program in the search, the same program identifies the same channel identifier. It characterized in that it comprises the step of selecting a sub-audio data stream.

The audio channel selection method according to the present invention has the effect of following the voice mode selected by the user even when the program or audio data stream is switched.

Description

Method for selecting of audio channel}

The present invention relates to a method of selecting an audio signal that allows an A / V device that plays a program including a plurality of audio data streams to follow and select an audio channel selected by a user even if the program or audio data stream is switched. will be.

Commonly used as a compression coding method of current audio signals are MPEG and AC3, and there is also a linear PCM which is recorded as it is without compression coding. In digital TV broadcasting or digital AV equipment such as video CD and DVD, compressed and encoded audio data is used as a data stream. In this case, the MPEG system standard is mainly used.

When the encoded data strings of MPEG video or MPEG audio and other data strings are combined and applied to actual applications, it is necessary to make them into a single integrated data string including synchronization, and some auxiliary data may be allocated depending on the application. Can be used. As such, it is the role of the MPEG system to synchronize video and audio data with synchronization.

In the MPEG system, a packet multiplexing scheme is adopted. In case of multiplexing by video, for example, when video and audio are multiplexed, video and audio are divided into appropriately-length data strings called packets, and the video and audio packets are appropriately time-divided and transmitted by assigning headers and the like. That's the way.

These packets contain information for identifying an attribute of video or audio in the head called a header as shown in FIG. The length of the packet depends on the transmission medium or the application. In MPEG, the upper limit of the length is up to 64 KB for various applications, and in order to have flexibility, either fixed length or variable length can be taken for each packet.

Table 1 is for showing the contents of the packet header shown in FIG.

Major Items Packet_start_code_prefix "00 00 01" h stream_id 1 byte, classify data type PTS value (DTS value) data Video, MPEG Audio, or Private Data

In Table 1, Packet_start_code_prefix indicates that a packet is started, and stream_id indicates the type of data. For example, video is "1110 0000" b, and audio is "1100 0 ***" b. Here, *** indicates that there may be a total of eight data streams from 000b to 111b. In the MPEG system, other data can be defined as a private stream and used as a substructure. The code "1011 1101" b can be used for this private stream.

PTS and DTS are defined by the MPEG system standard, and represent the time output and presentation time of a presentation unit (playback unit) in video or audio, respectively. A presentation unit is a frame that is one frame of an image in video and data for a predetermined time in audio. For audio, no DTS is needed.

Audio such as AC3 or LPCM except MPEG audio is configured as a private stream, and the substructure thereof is shown in Table 2.

Major Items Packet_start_code_prefix "00 00 01" h stream_id "1011 1101" b PTS value substream_id AC3 or LPCM number_of_audio_channels Audio channel count data

In Table 2, the substream_id is used to distinguish between audio encoding types such as AC3 and LPCM. For example, in the case of AC3, "1010 0 ***" b and the like. Here, *** means that up to 8 data streams may exist as in MPEG audio. In MPEG, one program may have several video data streams and audio data streams.

number_of_audio_channels indicates the number of channels of audio data. There are 1ch, 2ch, 3ch, 4ch, and dual mono channels according to the number of channels.

In MPEG-1 and MPEG-2 PS (Program Stream), there is a layer called a pack above a video or audio packet, and a pack of a plurality of packets is usually treated as a structural unit. Fig. 2 shows the structure of a pack, in which part of the pack header contains allocation information for time reference reference for synchronous reproduction.

Table 3 is for showing the contents of the pack header shown in FIG.

Major Items Pack_start_code "00 00 01 BA" h "01" Indicates that this is MPEG-2 data SCR value program_mux_rate program_stuffing_length

In Table 3, Pack_start_code indicates that the pack data starts from here, and SCR indicates the time when the pack data reaches the decoder buffer and is used to synchronize the system clock of the encoder and the decoder. . program_mux_rate represents a transmission rate in which video, audio, and private data are all multiplexed and transmitted. For proper decoding, the program_mux_rate should be transmitted at a higher speed than this transmission rate. pack_stuffing_length indicates the number of data that is filled without meaning in packet data and does not belong to packet data.

3 is shown for schematically showing a channel and corresponding audio signals. As shown in FIG. 3, audio data is output for each channel through a decoder. In the case of dual mono, CH0 and CH1 come out very similar to 2ch data, but in the case of dual mono, CH0 and CH1 are separate audios, whereas in the case of 2ch, they are LEFT and RIGHT audio data.

For example, in dual mono, CH0 can have Korean audio and CH1 can have English audio. Therefore, in the normal case, only one of the two channels is selected and output. Alternatively, CH0 may be output through the left speaker and CH1 through the right speaker.

4 shows an example of an apparatus for decoding and outputting a dual mono. In the apparatus shown in FIG. 4, when the selection signal is 0, both left and right channels output CH0, when the selection signal is 1, both left and right channels output CH1, and when the selection signal is 2, CH1 is output to the left channel. Outputs CH1 to the right channel.

Fig. 5 is a schematic view of a method of recording or playing back an audio multiple audio signal. The voice multiple audio signal is composed of main audio and sub audio. In recording or broadcasting, the main audio and the sub audio are encoded into one audio data stream through an audio multiplexer. At this time, the main audio is encoded by CH0 and the sub-audio is encoded by CH1.

Upon reproduction or reception, the audio data stream is decoded into CH0 and CH1 via a speech multiplexer. CH0 is the primary audio and CH1 is the secondary audio.

It is assumed here that a plurality of audio data streams exist. For example, if two audio data streams exist in the A / V data stream, the user may select two channels. However, if the selected audio data stream is dual mono, the user may select two channels again.

In current A / V audio equipment, if both audio data streams are dual mono, and the user listens to the sub audio from one audio data stream and selects the other audio data stream, the main audio is listened by default. It is configured to.

In other words, if a user watches a voice multiplexed program in which the main voice is in Korean and the sub-voice is in English and selects another program, the viewer cannot listen to the English broadcast continuously because the Korean language is to be watched. There is discomfort.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and even though a program or audio data stream is switched in an A / V device that reproduces a plurality of audio data streams, the same audio channel can be selected by following a user's audio selection input. To provide a method.

1 shows the structure of a packet in an MPEG system.

2 shows the structure of a pack in an MPEG system.

3 shows an audio signal for each channel.

4 is a diagram schematically illustrating a method of selecting a dual mono audio signal.

5 is a diagram schematically showing a recording and reproducing process of a dual mono audio signal.

6 is a block diagram showing the configuration of a recording / reproducing apparatus suitable for an audio channel selecting method according to the present invention.

One embodiment of an audio channel selection method according to the present invention for achieving the above object is

A plurality of programs, one program comprising at least two kinds of audio data streams, each audio data stream having at least two sub audio data streams having a series of identifiers according to a predetermined priority without overlapping each other; A method for selecting audio channels of an A / V data stream comprising:

When a program of one of the programs is switched to the other of the programs, a sub having the same channel identifier as the channel identifier assigned to the sub audio data stream of the program being played before the programs are switched to the switched program. Searching for the presence of an audio data stream;

If there is a sub-audio data stream having the same channel identifier as the channel identifier assigned to the sub-audio data stream of the program played before the programs are switched to the switched program in the search, the same program identifies the same channel identifier. It characterized in that it comprises the step of selecting a sub-audio data stream.

Another embodiment of the audio channel selection method according to the present invention for achieving the above object is

10. A method comprising selecting a plurality of programs, each program comprising at least two audio data streams, wherein one of the audio data streams selects dual mono channels to audio channels of an A / V data stream.

Playing one of the dual mono channels of one audio data stream of the audio data streams of the first program of the programs;

Switching to the second of the programs; And

Determine if one of the dual mono channels of one of the audio data streams of the second program corresponds to one dual mono channel of one of the audio data streams of the first program and the correspondence And if present, playing the corresponding dual mono channel of the corresponding audio stream of the second program.

Another embodiment of the audio channel selection method according to the present invention for achieving the above object is

A plurality of programs, each program comprising at least two kinds of audio data streams, each audio data stream having at least one channel, some of the audio data streams having dual moto channels, and each channel being A method for selecting audio channels of an A / V data stream having a channel identifier according to a predetermined priority in a program, the method comprising:

When the first of the programs is switched to the second of the programs, etc., the second of the second program has the same channel identifier as the channel color code assigned to the first dual mono channel of the first program that was played before switching. Searching for the presence of dual moto channels; And

If the search is successful, the method may include selecting a second dual mono channel.

Hereinafter, the configuration and operation of the present invention will be described in detail with reference to the accompanying drawings.

An audio channel identification symbol assignment method suitable for the present invention is characterized by assigning separate channel identification symbols to audio channels included in the program.

Table 4 shows an example of channel identification symbols assigned according to the channel identification symbol allocation method of the present invention for each data stream and its sub audio data streams when three audio data streams are recorded in one program. Here, it is assumed that each data stream is in dual mono mode.

Channel ID Channel ID Datastream 1 If not dual mono One dual mono CH0 One CH1 2 Datastream 2 " 3 " CH0 3 CH1 4 Datastream 3 " 5 " CH0 5 CH1 6

As shown in the example of Table 4, when the data stream is not dual mono, a channel ID such as 2n-1 (n = 1, 2, 3) is assigned. N is equal to the data stream number. In the case of dual mono, 2n-1 is assigned to CH0 inside and 2n channel ID is assigned to CH1.

When a user presses an audio switching key through a device such as a remote controller, a number larger than the currently playing channel ID is sequentially selected and output. If the user sets one channel ID, the audio data stream corresponding to the channel ID is continuously selected, decoded, and output.

The method for selecting an audio channel according to the present invention is characterized in that the audio channel selected in the program before switching during the switching of the program is selected by following the program in the switching. If there is no audio channel before switching, a default audio channel is selected.

It is assumed here that a new data stream is encountered during playback. Audio data different from the previous data stream may be recorded in the new data stream. In the old data stream, there was one data stream for audio and dual mono, but the new data stream had two non-dual mono data streams.

In the audio channel selection method of the present invention, if there is data corresponding to the channel ID being played back, the audio channel selection method selects and plays back the data.

As an example of possible switching, if there is data corresponding to the previous channel ID being played, it is selected and played. If there is no corresponding data, the data corresponding to the current channel ID-1 is displayed if the current channel is even. If it is found, it is selected and outputted. If not, it is selected and outputted corresponding to channel ID 1. If the current channel is odd when there is no corresponding data, the corresponding channel ID 1 is selected and output.

If the program is changed again and there is no data in the channel ID of the previous program, if there is data corresponding to the channel ID, the data of the channel ID of the new program is automatically selected and output.

Table 5 shows another example of audio data stream combinations.

Program 1 Program 2 Data stream 1 (dual mono) CH0; Channel ID 1 Data stream 1 (non dual mono) Channel ID 1 CH1; Channel ID 2 Data stream 2 (dual mono) CH0; Channel ID 3 Data stream 2 (non dual mono) Channel ID 3 CH1; Channel ID 4

For example, if the user presses the audio switching key during the playback of program 1, the output audio signal is switched in the order of CH0 of data stream 1-> CH1 of data stream 1-> CH0 of data stream 2-> CH1 of data stream 2 do.

On the other hand, when program 1 is completed by selecting CH0 of data stream 2, which is channel ID 3, and the next program 2 is to be played, it is checked whether there is data of channel ID 3 first. Play data stream 2 because it exists.

On the other hand, when program 1 is completed by selecting CH1 of data stream 2 with channel ID 4 and the next program 2 is to be played back, it is checked whether data of channel ID 4 is present. Since there is no data corresponding to the data stream 1, data stream 1 having the base channel ID 1 is selected and played.

Or, if there is a channel ID 3 minus 1 from channel ID 4, select it. If not, you can select data stream 1, which is the default channel ID number 1, to play it. .

If the channel ID is odd, it means one audio or primary audio channel in dual mono, and even number means secondary audio channel in dual mono.

When the user switches audio, it is desirable for the user to switch channels without being aware of whether the audio channel is classified into a separate audio data stream or a single mono data stream.

According to the audio channel selection method of the present invention, when an audio switching key is input, first the main audio and the sub audio are switched in the corresponding audio data stream, and the next audio data stream is switched.

Also, if the user selects one audio channel, if possible, maintain the current channel even if the program changes.

However, if there is no corresponding channel, select the appropriate channel. In this case, you can unconditionally select the main channel CH0 to play it, or find the channel closest to the currently selected audio (if the channel ID is even, that is, the sub audio, the main audio channel is the closest channel, and this is the odd channel ID). -1) Play.

If there is no audio data stream that corresponds to the currently set channel ID, save this channel ID first, and select and output the default channel according to the above method, or select and play the closest channel. When the audio data stream appears, it is also possible to select and output the data again.

This is because when a user selects and plays a sub-audio channel and plays a program without sub audio for a while, it is inevitable to select and play the appropriate channel, and then select and play sub audio again when playing a program with sub audio again. If it is. Otherwise, the user will have to switch back to play the sub audio.

For example, Table 6 shows Program 3 combined after Program 2 in Table 5.

Program 1 Program 2 Program 3 Data Stream 1 (Dual Mono) CH0; channel ID 1 Data stream 1 (if not dual mono) channel ID 1 Data Stream 1 (Dual Mono) CH0; channel ID 1 CH1; channel ID 2 CH1; channel ID 2 Data Stream 2 (Dual Mono) CH0; channel ID 3 Data Stream 2 (if not Dual Mono) channel ID 3 Data Stream 2 (Dual Mono) CH0; channel ID 3 CH1; channel ID 4 CH1; channel ID 4

If channel ID 4 is the originally selected channel selected by the user while recording / storing program 1 and then a new program 2 is selected, channel ID 3 of program 2 (data stream 2) is selected. When a new program 3 is selected after the program 2, the channel ID 4 (CH1) of the program 3 is selected and automatically returns to the original channel ID 4.

6 is a block diagram showing a configuration of a recording / reproducing apparatus suitable for an audio channel selecting method according to the present invention, in which A / V data is recorded and reproduced using a recordable and rewritable disc. Can be divided.

In recording, the AV codec 110 compresses and encodes an externally input A / V signal by a predetermined compression scheme, and provides size information about the compressed data. The Digital Signal Processor (DSP) 120 receives A / V data supplied from the AV codec 110 and allocates allocation data for Error Correction Code (ECC) processing, and performs modulation or the like by a predetermined modulation scheme. A high frequency amplifier (denoted RF AMP: 130) converts electrical data supplied from the DSP 120 into an optical signal.

The pickup unit 140 drives a disk, records an optical signal from the RF AMP 130 on the disk, and has an built-in actuator for focusing and tracking. The servo unit 150 receives information necessary for servo control from the RF AMP 130 and the system controller 160 to perform stable servo. System controller 160 corresponds to the processing portion in the summary of the invention.

The system controller 160 controls the entire system, and in particular, determines the encoding mode of the audio data and controls the data to be recorded on the disc.

At the time of reproduction, the pickup section 140 picks up the optical signal from the disk storing the data, and the data is extracted from the optical signal. The RF AMP 130 converts the optical signal into an electrical signal and extracts a servo signal and modulated data for performing the servo.

The DSP 120 demodulates the modulated data supplied from the RF AMP 130 in response to a modulation scheme used for modulation, and performs error code correction (ECC) to correct an error. The servo unit 150 receives information necessary for servo control from the RF AMP 130 and the system controller 160 to perform stable servo.

The AV codec 110 decodes the compressed A / V data supplied from the DSP 120 and outputs an A / V signal. In particular, a plurality of audio data streams are output by decoding the compressed audio data.

The system controller 160 controls the pickup unit 140, the RF AMP 130, the DSP 120, and the AV codec 110 in the same manner as described above while performing a user interface such as processing a user's key input. In particular, when a command for audio switching is input from the key input unit 170, the audio data stream is analyzed to select and play data corresponding to audio switching.

As described above, the audio channel selection method according to the present invention has the effect of following the voice mode selected by the user even if the program or audio data stream is switched.

Claims (12)

A plurality of programs, one program comprising at least two kinds of audio data streams, each audio data stream having at least two sub audio data streams having a series of identifiers according to a predetermined priority without overlapping each other; A method for selecting audio channels of an A / V data stream comprising: When a program of one of the programs is switched to the other of the programs, a sub having the same channel identifier as the channel identifier assigned to the sub audio data stream of the program being played before the programs are switched to the switched program. Searching for the presence of an audio data stream; If there is a sub-audio data stream having the same channel identifier as the channel identifier assigned to the sub-audio data stream of the program played before the programs are switched to the switched program in the search, the same program identifies the same channel identifier. And selecting the sub-audio data stream to have. The method of claim 1, wherein if the switched program does not have a sub audio data stream having the same channel identifier as the channel identifier assigned to the sub audio data stream of the program being played before the programs are switched, And selecting a sub-audio data stream having a first priority channel identification symbol according to a predetermined priority in another program. The method of claim 1, If the switched program does not have a sub audio data stream having the same channel identifier as the channel identifier assigned to the sub audio data stream of the program being played before the programs are switched, Searching for among the sub audio data streams of another program whether there is a sub audio data stream having a channel identifier having a lower priority than the channel identifier assigned to the sub audio data stream of the played program before the programs are switched; ; And If one of the sub audio data streams of another program has a sub audio data stream having a channel identifier having a lower priority than the channel identifier assigned to the sub audio data stream of the program being played before the programs are switched, another program may be used. And selecting a sub audio data stream having a channel identifier having a lower priority than a channel identifier assigned to the sub audio data stream of the program being played before the programs are switched from the sub audio data streams of. An audio channel selection method. 12. A method comprising selecting a plurality of programs, each program comprising at least two audio data streams, wherein one of the audio data streams selects dual mono channels to audio channels of an A / V data stream. Playing one of the dual mono channels of one audio data stream of the audio data streams of the first program of the programs; Switching to the second of the programs; And Determine if one of the dual mono channels of one of the audio data streams of the second program corresponds to one dual mono channel of one of the audio data streams of the first program and the correspondence And if present, playing the corresponding dual mono channel of the corresponding audio stream of the second program. The method of claim 4, wherein And if there is no correspondence in the determining, reproducing one of the audio streams of the second program corresponding to the corresponding audio stream of the first program having the corresponding dual mono channel. How to choose. The method of claim 4, wherein If there is no correspondence in the determination, one channel of one of the audio data streams of the audio data streams of the second program having the closest priority to the corresponding audio data stream of the first program having the corresponding dual mono channel is selected. The audio channel selection method further comprising the step of playing. The method of claim 4, wherein And reproducing a default channel among the audio data streams of the second program if there is no correspondence in the determination process. The method of claim 4, wherein If there is no correspondence in the determination, one channel of one audio data stream of the audio streams of the second program having a higher priority than the corresponding audio data stream of the first program having the corresponding dual mono channel is played. The audio channel selection method further comprising the step of. A plurality of programs, each program comprising at least two kinds of audio data streams, each audio data stream having at least one channel, some of the audio data streams having dual moto channels, and each channel being A method for selecting audio channels of an A / V data stream having a channel identifier according to a predetermined priority in a program, the method comprising: When the first of the programs is switched to the second of the programs, etc., the second of the second program has the same channel identifier as the channel color code assigned to the first dual mono channel of the first program that was played before switching. Searching for the presence of dual moto channels; And And if the search is successful, selecting a second dual mono channel. The method of claim 9, If the search is unsuccessful, further comprising selecting a channel having a channel identifier having a higher priority than the first dual mono channel in the second program. The method of claim 9, And if the search is unsuccessful, selecting a channel having a channel identification symbol of a priority closest to that of the first dual mono channel among the channels of the second program. The method of claim 9, If the search is not successful, the method further comprises selecting a default channel among the channels of the second program.