JP2002063779A - Method for adding audio channel id, method for selecting audio channel by using the method, and optical recording and reproducing device suitable therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology which can follow and select an audio channel selected by a user even when a program or the like are switched, in an A/V device reproducing a program including plural audio data stream. SOLUTION: In the audio channel selecting method of an A/V data stream which comprises plural programs, in which one program comprises at least two kinds of audio data stream, each of audio data streams comprises at least two sub-audio data stream, and each sub-audio data stream has a series of ID based on the prescribed priority order and not duplicating mutually, when a program is switched, it is searched whether a sub-audio data stream of a channel ID being equal to a channel ID added to a sub-audio data stream of a reproduced program before switching exists or not, and when it exists, this is selected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an A / V for reproducing a program including a plurality of audio data streams.
Even when the program or audio data stream is switched in the device, an audio channel ID (Identifier) that enables the user to follow and select the audio channel selected by the user.
The present invention relates to an addition method, an audio channel selection method using the same, and an optical recording / reproducing apparatus suitable for the method.

[0002]

2. Description of the Related Art At present, MPEG and AC3 are mainly used as a compression encoding method for audio signals, and LPCM (Line Line) is used for recording without compression encoding.
arPulse Code Modulation) is also used. Digital TV broadcast or digital AV
Devices such as VCD and DVD mainly use MPEG
Is used.

[0003] When an encoded data stream of MPEG A / V data and other data streams are integrated and applied to an actual application, such data must be integrated into one integrated data stream. Depending on the application, certain auxiliary data can be added and used. Thus, the function of the MPEG system is to multiplex video data and audio data while synchronizing them.

[0004] In the MPEG system, a multiplexing method using packets is adopted. Multiplexing by packets means that video data and audio data are each divided into data streams of an appropriate length called packets, and information such as a header is added to multiplex the video data and audio data packets. It is a method.

In these packets, as shown in FIG. 1, information for identifying the attribute of video data or audio data exists in a portion called a header. The length of the packet depends on the transmission medium or application.

Table 1 shows the contents of the packet header shown in FIG.

[Table 1]

Here, Packet_start_co
de_prefix indicates that the packet starts,
stream_id represents the type of data. For example, in the case of video data, “1110 0000” in binary number
b, and in the case of audio data, “11” in binary
00 0 *** "b, where *** is 000
It indicates that there are a total of eight types of data streams from b to 111b. In the MPEG system, data other than these two types is used as a private stream.
The code “1011 1101” b can be used for the te stream.

[0008] PTS (Presentation Ti
me Stamp) and DTS (Decoding T)
The “im Stamp” is based on the MPEG system standard, and is a playback unit (presententati) in video data, audio data, or the like.
on unit) output time and decoding time. The playback unit refers to one frame of video in video data, and one frame of audio in audio data. In the case of audio data, DTS is unnecessary.

AC3 excluding MPEG audio data
Or, audio data such as LPCM is privat
It is constructed by e-streaming. Table 2 shows the packet header at this time.

[Table 2]

[0010] The substream_id is used to distinguish the type of audio coding, such as AC3 or LPCM. For example, in the case of AC3, it is "1010 ***" b. here,***
Means that there can be up to eight data streams, as in MPEG audio data. M
In PEG, one program can have many video data streams and audio data streams.

Number_of_audio_cha
nnels represents the number of channels, and 1c
h, 2ch, 3ch, 4ch and dual mono channels. The channel here is different from the channel in which the user makes a selection. That is, d
With the exception of the ua mono channel, all are recognized as one channel by the user. dual
mono is recognized as two.

[0012] MPEG-1 or MPEG-2 PS (P
In the program stream, a pack (Pac) is placed above a video packet or an audio packet.
There is an upper hierarchy called k). Usually, a pack composed of a plurality of video packets or audio packets is handled as one basic unit. FIG. 2 shows the structure of the pack. Referring to this, at the pack header, there is additional information for time reference reference for synchronous reproduction.

Table 3 shows the contents of the pack header shown in FIG.

[Table 3]

Here, Pack_start_code
Is a code indicating that the pack data starts from here. The SCR value indicates the time when the packed data reaches the buffer of the decoder, and is used to synchronize the system clocks of the encoding end and the decoding end. program_mu
x_rate is video data, audio data, p
It indicates a transmission rate at which all the relevant data are multiplexed and transmitted. Here, for correct decoding, transmission at a transmission rate higher than this transmission rate is required. pack_st
uffing_length represents the number of dummy data.

FIG. 3 shows channels and their corresponding audio signals. As shown in FIG.
An audio signal is output via the decoder. here,
In the case of dual mono channel data, CH0
The audio data and CH1 audio data are output, and it looks very similar to the case of 2ch data, but in the case of dual mono channel data, C
While the H0 audio data and the CH1 audio data are unrelated audio data, 2c
The case of h data is different in that left audio data and right audio data are related to each other.

For example, in a dual mono channel, CH0 contains Korean audio data, and CH1 contains CH1 audio data.
May have audio data in English.
Here, usually, only one of the two channels is selected and output. Or CH0 via the left speaker
May be output via the right speaker.

FIG. 4 shows an example of an apparatus for decoding and outputting data of a dual mono channel.
In the device shown in FIG. 4, if the selection signal is 0,
CH0 for both left audio data and right audio data
The audio data is output, and if the selection signal is 1, CH1 audio data is output for both the left audio data and the right audio data. If the selection signal is 2, CH1 audio data is output to LEFT AUDIO and CH1 audio data is output to RIGHT AUDIO.

FIG. 5 shows a case where the audio multiplexed audio signal is dua.
It shows a method of recording or reproducing as mono audio data. The audio multiplex audio signal is
It is composed of main audio data and sub audio data. In recording, the main audio data and the sub audio data are encoded into one audio data stream via a voice multiplex encoder. At this time, the main audio data is encoded into CH0, and the sub audio data is encoded into CH1.

Upon reproduction, the audio data stream is decoded into CH0 audio data and CH1 audio data via an audio multiplex decoder. here,
CH0 audio data is main audio data,
CH1 audio data is sub audio data.

Here, it is assumed that there are a plurality of audio data streams. For example, if there are two audio data streams in the A / V data stream, the user can select one of the two channels. However, if the selected audio data stream is dual mono data, that is, if it includes a sub audio data stream, the user can further select two channels.

[0021]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an A / V data stream including a plurality of audio data streams, wherein each audio data stream is included in the audio data stream when the audio data stream is in a dual mono mode. An object of the present invention is to provide a method for adding a channel ID to a sub audio data stream.

Another object of the present invention is to provide a dual mono.
In an A / V device that reproduces a plurality of audio data streams that recognize a mode, even if a program or an audio data stream is switched,
An object of the present invention is to provide a method of selecting the same type of audio channel by following an audio channel input by a user.

Still another object of the present invention is to provide an apparatus suitable for the above-described audio channel selecting method.

[0024]

The method according to the present invention comprises:
In a method for selecting an audio channel of an A / V data stream comprising a plurality of programs, each program comprises at least two types of audio data streams, each audio data stream being a non-repeated sequence of a predetermined priority. Comprising at least two sub-audio data streams having a channel ID,
The method comprises: (a) when one of the programs is changed to another of the program, the same as the channel ID assigned to the sub audio data stream of the program that was being played before the program was changed; Searching in another program for a sub audio data stream having a channel ID; (b)
If it is determined in step (a) that there is a sub audio data stream having the same channel ID as the channel ID assigned to the sub audio data stream of the program being played before the program was changed, Selecting a sub audio data stream having the same channel ID of the program.

Another method according to the present invention is a method for selecting an audio channel of an A / V data stream including a plurality of programs, wherein each program comprises:
Comprising at least two audio data streams,
One of the audio data streams has a dual mono channel, the method comprises: playing one of the dual mono channels of one of the audio data streams of a first one of the programs; Changing to a second one, wherein one of the dual mono channels of the audio data stream of the second program corresponds to one of the dual mono channels of the audio data stream of the first program Decide if you want to
Reproducing one dual mono channel of one audio data stream of the program.

Further, still another method according to the present invention comprises:
In a method for selecting an audio channel of an A / V data stream comprising a plurality of programs, each program comprises at least two audio data streams with at least one channel, one of the audio data streams comprising a dual mono channel Have
Each channel has a channel ID according to a predetermined priority in the program, and the method is such that when the first one of the programs is changed to the second one of the programs, it is played prior to the change. Searching for a second dual mono channel of the second program having the same channel ID as the channel ID assigned to the first dual mono channel of the first program, and if the search is successful, Selecting a second dual mono channel.

[0027]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
The configuration and operation of the present invention will be specifically described. An audio channel ID adding method according to the present invention is characterized in that different channel IDs are added to audio channels included in a program.

Table 4 shows examples of channel IDs added according to the channel ID adding method according to the present invention when three audio data streams are recorded in one program.

[Table 4]

As is clear from the example in Table 4, dual
If not mono, 2n-1 (where n = 1,
A channel ID corresponding to (2, 3) is added. At this time, n is equal to the data stream number. In contrast,
In the case of dual mono, a channel ID corresponding to 2n-1 is added to CH0, and a channel ID corresponding to 2n is added to CH1.

When the audio switch key is pressed by a user via a remote control device such as a remote controller, numbers larger than the currently reproduced channel ID are selected and output in order. Here, when the user sets one channel ID, the audio data stream corresponding to the ID is continuously selected, decoded, and output.

The audio channel selection method according to the present invention is characterized in that, when a program is switched, an audio channel selected in a program before switching is also followed and selected in a program after switching. . If there is no audio channel before switching, a default audio channel is selected.

Here, it is assumed that a new data stream is input during reproduction. The new data stream may record audio data different from the previous data stream. For example, the previous data stream has one audio data stream and is recorded in dual mono, while the new data stream has dual mono.
Audio data streams other than the above are recorded.

In the audio channel selecting method according to the present invention, if there is data corresponding to the previously reproduced channel ID, it is selected and reproduced, and if not, it corresponds to channel ID-1. Select and output one.

Further, as another example, if there is data corresponding to the previously reproduced channel ID, it is selected and reproduced. Otherwise, if the current channel is an even number, the current channel is reproduced. Data corresponding to channel ID-1 is searched for, and if found, it is selected and output; otherwise, data corresponding to channel ID-1 is selected and output. Also, there is no equivalent data,
And if the current channel is odd, channel I
D-1 is selected and output.

Table 5 shows another example of the combination of the audio data streams.

[Table 5]

For example, if the audio switch key is pressed by the user during the reproduction of the program 1, the output audio signal will be CH0 of the data stream 1 → CH1 of the data stream 1 → CH0 of the data stream 2.
→ Switching is performed in the order of CH1 of the data stream 2.

On the other hand, when the reproduction of the program 1 is completed by selecting CH0 of the data stream 2 having the channel ID of 3, and then the reproduction of the program 2 is attempted, the data stream corresponding to the channel ID 3 is first created. Check whether it exists. Here, since the data stream 2 corresponding to the channel ID 3 exists in the program 2, it is reproduced.

Further, when the reproduction of the program 1 is completed by selecting CH1 of the data stream 2 having the channel ID of 4 and then attempting to reproduce the program 2, the data stream corresponding to the channel ID 4 is firstly generated. Check whether it exists. Here, since there is no data corresponding to the channel ID4 in the program 2, the data stream 1 of the basic channel ID1 is selected and reproduced.

In addition, as a preferable channel switching method, it is checked whether or not a channel ID 3 corresponding to the channel ID 4-1 exists, and if it exists, it is selected. If not, it corresponds to the basic channel ID 1. There is a method of selecting the data stream 1 to be reproduced and reproducing it. Here, since a data stream corresponding to channel ID 3 exists, it is reproduced.

In the method according to the invention, channel I
If D is odd, then non dual mono,
Alternatively, it means a main audio channel in dual mono. On the other hand, when the channel ID is an even number, it means a sub audio channel in dual mono.

At the time of audio channel switching by the user, the audio channel is classified into another audio data stream from the viewpoint of the user.
Regardless of whether it is classified as "ono", it is preferable that channel switching be performed.

According to the audio channel selection method according to the present invention, when an input is made by the audio switching key, switching from the main audio data to the sub audio data is first performed in the corresponding audio data stream, and then the audio data is streamed. A switch to the data stream is made.

When one audio channel is selected by the user, the currently set channel is maintained as it is even if the program is switched.

However, when there is no corresponding channel, it is necessary to select a channel corresponding to the channel. At this time, the basic channel CH0 is unconditionally set.
To play back or search for the channel closest to the currently selected audio channel (if the channel ID is an even number, ie, if it is sub audio data, the main audio channel is closest to Channel, which is odd channel ID-1).

If there is no audio data stream corresponding to the currently set channel ID,
First, the channel ID is stored, and the basic channel is selected and output according to the above-described method, or the closest channel is selected and reproduced. During the reproduction, the audio data stream corresponding to the above-described channel ID is output. When it appears, the data stream may be further selected and output.

This is because when the user selects a sub audio channel and reproduces the program without the sub audio channel for a while during reproduction, and reproduces the program with the original sub audio channel again, This is performed when a sub audio channel is selected and reproduced. Otherwise, the user has to switch further to play the sub audio channel.

FIG. 6 is a block diagram showing an optical recording / reproducing apparatus suitable for the present invention.
A / V data is recorded and reproduced. The functions can be roughly divided into recording and reproduction.

For recording, the A / V codec 110
An A / V signal input from the outside is compression-encoded according to a predetermined compression system, and capacity information for the compressed data is provided. Digital signal processor (Digi
tal Signal Processor;
The SP 120 receives the A / V data from the A / V codec 110 and receives an error correction code (Erro code).
r Correction Code (hereinafter, referred to as ECC) is added with additional data for processing, and modulation is performed according to a predetermined modulation system. High frequency amplifier (hereinafter R
The FAMP 130 converts the electrical data from the DSP 120 into an optical signal.

The pickup section 140 has an RF AMP
An actuator for recording an optical signal from 130 on a disk and performing focusing and tracking is incorporated. The servo unit 150
RF AMP 130 and system controller 160
Receives the information necessary to perform servo control from
Perform servo control.

The system controller 160 controls the entire system. In particular, the encoding mode of the audio data is determined, and control is performed so that the data is recorded on the disk.

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

The DSP 120 has an RF AMP 130
Is demodulated in accordance with the modulation scheme used for the modulation, ECC is performed to correct errors, and additional data is removed. The servo unit 150
RF AMP 130 and system controller 160
, The information necessary for servo control is received, and stable servo is performed.

The A / V codec 110 is a DSP 12
0 to decode the compressed A / V data from A / V
Output a signal.

The system controller 160 performs a user interface such as processing a key input by the user, and performs the pickup unit 140, the RF AMP 130, the DSP 120, the A /
The V codec 110 is controlled. In particular, when a command for switching the audio data stream is input via the key input unit 170, the audio data stream is analyzed, and the corresponding audio data is selected and reproduced.

[0055]

As described above, according to the channel ID adding method according to the present invention, different channel IDs are added to each channel of the audio data stream so that the same channel follows when selecting an audio signal. It is possible. Further, according to the audio channel selecting method of the present invention, there is an effect that the audio mode selected by the user can be followed even when the program or the audio data stream is switched.

[Brief description of the drawings]

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

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

FIG. 3 shows an audio signal for each channel.

FIG. 4 illustrates an example of an apparatus for decoding and outputting dual mono channel data.

FIG. 5 shows a method for recording or reproducing an audio multiplexed audio signal as dual mono audio data.

FIG. 6 is a block diagram of a recording / reproducing apparatus according to the present invention.

[Explanation of symbols]

 110 A / V codec 120 DSP 130 RF AMP 140 Pickup unit 150 Servo unit 160 System controller 170 Key input unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Jung Tai-Mun 41, Fumin-dong 41-gil, Gwacheon-si, Gyeonggi-do South Korea, Part 806 Building 602 (72) Inventor Jang Seok-soon Bun-dong, Songpa-gu, Seoul, Republic of Korea 72-3, No. 101, Building 1310, No. 1310 (72) Inventor Park Ji-Gi 1047, Yeong-dong, Paldal-gu, Suwon-si, Gyeonggi-do, Republic of Korea F-term (reference) 5D044 AB05 DE03 DE14 DE49 JJ02 5D077 AA30 BA14 CA02 CB06 DC21 EA34

Claims (12)

[Claims] 1. A method for selecting an audio channel of an A / V data stream comprising a plurality of programs, wherein each program comprises at least two types of audio data streams, wherein each audio data stream is not repeated and has a predetermined priority. Comprising at least two sub-audio data streams with a series of channel IDs according to the method: (a) when one of the programs is changed to another of the programs, the program is changed Searching in another program for a sub audio data stream having the same channel ID as the channel ID allocated to the sub audio data stream of the previously played program; and (b) step (a). ), Played before the program is changed Selecting a sub audio data stream having the same channel ID of another program when it is determined that there is a sub audio data stream having the same channel ID as the channel ID allocated to the sub audio data stream of the previous program. A method comprising: 2. When there is no sub audio data stream having the same channel ID as the channel ID assigned to the sub audio data stream of the program being reproduced before the change, the method in another program is as follows. 2. The method according to claim 1, further comprising the step of selecting a sub audio data stream having a channel selection number having a first priority of a predetermined priority among sub audio data streams of another program. the method of. 3. If there is no sub audio data stream having the same channel ID as the channel ID allocated to the sub audio data stream of the program being reproduced before the change, the program is reproduced before the program is changed. Searching in the sub audio data stream of another program for a sub audio data stream having a channel ID having a higher priority than the priority of the channel ID assigned to the sub audio data stream of the selected program And a sub audio data stream having a channel ID having a higher priority than the channel ID assigned to the sub audio data stream of the program reproduced before the program is changed exists in another program. sometimes A sub audio data having a higher priority than a channel ID assigned to a sub audio data stream of a program reproduced from a sub audio data stream of another program before the program is changed. Selecting a stream. 4. A method for selecting an audio channel of an A / V data stream comprising a plurality of programs, wherein each program comprises at least two audio data streams, one of said audio data streams comprising a dual audio data stream. Having a mono channel, the method comprises: playing one of the dual mono channels of one of the audio data streams of the first one of the programs; changing to a second one of the programs; Determine whether one of the dual mono channels of the audio data stream of the first program corresponds to one dual mono channel of one audio data stream of the first program, and if so, One audio data stream of the second program Playing one dual mono channel of the system. 5. If no decision is taken at the decision stage,
5. The method of claim 4, further comprising playing one of the audio streams of the second program corresponding to one audio stream of the first program with one dual mono channel. 6. If no decision is taken at the decision stage,
The method further comprises playing one channel of one of the audio streams of the second program having the closest rank to the one audio data stream of the first program having one dual mono channel. 5. The method of claim 4, wherein 7. If no response is made at the decision stage,
5. The method according to claim 4, further comprising the step of playing a default channel of one of the audio data streams of the second program. 8. If the decision is not taken at the decision stage,
The method further comprises playing one channel of one of the audio streams of the second program having a higher priority than one audio stream of the first program having one dual mono channel. 5. The method of claim 4, wherein 9. A method for selecting an audio channel of an A / V data stream comprising a plurality of programs, wherein each program comprises at least two audio data streams with at least one channel,
One of the audio data streams has dual mono channels, each channel has a channel ID according to a predetermined priority in the program, the method comprising: When changed to something, the first that was played prior to the change
Searching for a second dual mono channel of a second program having the same channel ID as the channel ID assigned to the first dual mono channel of the second program, and if the search is successful, the second Selecting a dual mono channel. 10. The method of claim 1, further comprising, if the search is not successful, selecting one channel of a second program having a channel selection number having a higher priority than the first dual mono channel. The method according to claim 9. 11. The method of claim 1, further comprising, if the search is not successful, selecting one channel of a second program having a channel selection number closest to the first dual mono channel. 9. The method according to 9. 12. The method of claim 9, further comprising the step of selecting one of the channel defaults of the second program if the search is not successful.