RU2303825C2 - Method for setting identification of sound channel, method for selecting sound channel with usage of the same and optical recording and reproduction device usable for said purpose - Google Patents

Abstract

FIELD: engineering of optical recording and/or reproduction devices.

SUBSTANCE: device contains system controller, by means of which it is possible to assign identifiers (ID) to channels of sound data streams, while one of the channels contains sub-tone data. Also by means of device, using a system controller, it is possible to track selected stream after change of program using aforementioned stream of sound data, or in case of absence of channel with given identifier, it is possible to replace used channel with appropriate channel.

EFFECT: possible tracking of the same channel, if sound signal is selected by setting of various ID channels for channels of sound data streams, possible tracking of sound mode selected by user even after change of program or sound data stream.

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Description

FIELD OF THE INVENTION

The present invention relates to a method for specifying (assigning) an identifier (ID) of an audio channel in which it is possible to track and select an audio channel selected by a user, even when a program or stream of audio data is changed in an audio / video (A / V) device for playback a program including a plurality of audio data streams, to a method for selecting an audio channel using one, and to an optical recording and reproducing apparatus used for this.

State of the art

Currently, the image and sound compression standards MPEG (moving image expert group) and NEA are often used as an encoding method with audio compression. In linear pulse code modulation (PCM), the audio signal is not encoded with compression, but recorded as it is. In digital television (TV) broadcasting or in a color display system (CDS) of video signals and digital video discs (DVDs), which are digital audio / video (A / V) devices, the MPEG compression standard is mainly used.

If the MPEG encoded audio / video data streams and other data streams are integrated and used for actual use, you must create a data stream by integrating these data streams. Ancillary data in accordance with a specific application may be additionally used. The role of the MPEG system is to synchronize and compress video and audio data.

In MPEG, packet compression is accepted. In packet compression, the data of each of the video and audio signals is divided into data streams, called packets that have a suitable length, information, such as headers, is assigned to the packets, and the video and audio data packets are compressed.

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

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

Table 1 Main sections Packet_start_code_prefix (package start code prefix) "00 00 01" h Stream_id (stream identifier) 1 byte to distinguish between varieties of data sections PTS value DTS value Data MPEG video, audio, or personal data

In table 1, Packet_start_code_prefix represents the beginning of the packet, and stream_id represents the varieties of data sections in the packet. For example, in the case of video data, stream_id is the binary code "1110 0000" b. In the case of audio data, stream_id is the binary code “1100 0 *** b. Here *** indicates that there can be eight varieties of data streams from 000b to 111b. In the MPEG system, data sections other than two data sections are classified as personal streams. Code "1011 1101" b can be used for personal stream.

The presentation time stamp (PTS) and the decoding time stamp (DTS) defined in the MPEG system standard respectively represent the time taken to output and decode the presentation unit in the video or audio data. A presentation unit is an image frame in video data and an audio frame in audio data. DTS is not necessary with audio data.

In addition to MPEG audio data, audio streams such as NEA or LPCM are implemented in individual streams. The packet header content accepted for private streams is shown in Table 2.

table 2 Main content Packet_start_code_prefix (package start code prefix) "00 00 01" h Stream_id (stream identifier) “1011 1101” b PTS value Substrean_id (Substream ID) NEA or LPCM Number_of_audio_channels (number of audio channels) Number of Sound Channels Data

In table 2, substream_id is used to distinguish between types of encoding of audio data, such as ASA or LPCM. For example, in the case of the ACA, substream_id is “1010 0 ***” b. Here *** means that there can be up to eight data streams, as in MPEG audio signals. In an MPEG system, one program can have different video streams and audio streams.

The term "number_of_audio_channels" refers to the number of channels. There can be 1-, 2-, 3-, 4-channel and dual monaural channels. Here the channels are different from the channels selected by the user. Namely, the above channels look like a single channel for the user, with the exception of dual monaural. Dual monaural is recognized as two channels.

In the MPEG-1 or MPEG-2 program stream (PS), there is an upper layer of video or audio packet, called a bundle. In general, a bundle formed by integrating multiple packages can be considered as the main unit. Figure 2 shows the structure of the pack. Additional information for the base timing for synchronous playback exists in the packet header.

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

Table 3 Main content Pack_start_code (pack start code) "00 00 01 BA" h "01" Indicates that the data is MPEG-2 SCR value Program_mux_rate (program compaction rate) Pack_stuffing_length (pack fill length)

In table 3, Pack_start_code is the code by which the packet data starts. The SCR value represents the time at which the burst data reaches the decoder buffer and is used to synchronize the encoding port system clock with the decoding port system clock. Program_mux_rate is the transmission rate at which sections of video, audio, and personal data are compressed and transmitted. For proper decoding of data, data must be transmitted at a transmission rate higher than the transmission rate. Pack_stuffing_length represents the amount of passive data.

Figure 3 schematically shows the channels and sound signals corresponding to this. As shown in FIG. 3, audio signals are output by decoding devices. The data of a double monophonic channel having outputs audio data of aids to navigation and audio data of CH1 are similar to 2-channel data. However, dual monophonic data differs from 2-channel data in that the left and right audio signals are connected to each other in 2-channel data, while CHO and CH1 are separate audio signals in double monophonic data.

For example, audio data from the Korean language can be uploaded to SSS, and audio data from the English language can be uploaded to CH1 in a dual monaural channel. Therefore, in general, only one of the two channels is output, or CHO audio data and CH1 audio data are output through the left speaker (speaker) and the right speaker, respectively.

Figure 4 shows an example of a device for decoding and outputting data of a dual monaural channel. If the selected signal is 0, the device shown in FIG. 4 outputs a CHO sound signal as left and right sound signals. If the selected signal is 1, the device outputs the sound signal CH1 as left and right sound signals. If the selected signal is 2, the device outputs sound signals CH1 and CH2 as left and right sound signals, respectively.

Figure 5 schematically shows a method of recording or reproducing a polyphonic sound signal as dual monophonic audio data. A polyphonic sound signal is formed from basic audio data and sub-tone data. If data is recorded, the main audio data and sub-tone data are encoded into the audio data stream by means of a multi-voice encoder. In this case, the main audio data is encoded into the audio data of the ATS, and the sub-tone is encoded into the audio data of the CH1.

If the data is reproduced, the audio data stream is decoded into the CHO audio data and the CH1 audio data by means of a multi-voice decoding device. The CHO audio data is the main audio data and the CH1 audio data is the sub-tone data.

Here it is assumed that there are many streams of audio data. For example, if there are two streams of audio data in an A / V data stream, the user can select one of two channels. If the selected audio data stream is dual monophonic data, i.e. subtonal data streams are included, the user can select two channels.

SUMMARY OF THE INVENTION

The first objective of the invention is to develop a method of setting a channel identifier (ID) for a sub-tonal data stream included in the audio data stream if each audio data stream exists in a dual mode in the audio / video (A / V) stream including a plurality of audio data streams.

Another object of the invention is to develop a method for selecting the same kind of sound channel by tracking the input of the choice of the sound channel by the user, despite the fact that the program or stream of audio data is changed in the A / V device to play multiple streams of audio data that allow dual monophonic mode.

Another objective of the invention is the development of a device applicable to the aforementioned method for selecting audio channels.

Thus, the first object of the invention is a method of specifying an audio channel ID, wherein channel ID 2n-1 (n is the order of precedence of audio data streams, 1, 2, 3 ...) are assigned to audio data streams in the audio / video stream (A / V ) data, including at least two varieties of streams of audio data, each of which exists in dual monophonic mode.

A second object of the invention is a method for selecting audio channels from an A / V data stream including a plurality of programs, each program includes at least two kinds of audio data streams, each audio data stream includes at least two subtonal data streams, which are not repeated and have an ID sequence in accordance with a predetermined precedence order, including steps when one program changes to another search program, is there a sub-data stream having a channel ID a, which is the same as the channel ID assigned to the sub-tonal data stream of the program that was played before the program was changed, in the modified program and, if there is a sub-tonal data stream having the channel ID, which is the same as The channel ID assigned to the sub-tonal data stream of the program that was playing before the program was changed, selecting the sub-tonal data stream.

A third aspect of the invention is an optical recording and reproducing apparatus including a capture unit for capturing an optical signal from a disc, a radio frequency amplifier (RF AMP) for converting an optical signal generated by the capture unit into an electrical signal, and extracting a servo signal and modulated data, a digital signal processor for output compressed A / V data stream by demodulating modulated data provided by RF AMR, a servo block for receiving information from RF AMR necessary to control servo by using the system controller and servo operations, an AV encoder for decoding the compressed A / V data stream provided by the digital signal processor and outputting the A / V data stream including a plurality of audio data streams, a key input device for inputting user key input and a system controller for user interface communication through a key input device and control of the capture unit, RF AMP, a digital signal processor and AV decoder device, and the system controller searches to see if there is a sub-data stream having the same channel ID as the channel ID assigned to the sub-data stream of the program that was played before the program was changed in the changed program when one program changes to another, and selects a sub-tone data stream having the same channel ID as the channel ID assigned to the sub-data stream of the program that was played before the program was changed in the changed program MME.

Brief Description of the Drawings

The above objectives and advantages of the present invention will become more apparent upon a detailed description of its preferred embodiment with reference to the attached drawings, in which:

figure 1 shows the structure of the packets in the MPEG system,

figure 2 shows the structure of the pack in the MPEG system,

figure 3 shows the audio signals in each channel,

figure 4 shows an example of a device for decoding and outputting data from a dual monaural channel,

5 schematically shows a method for recording and reproducing a polyphonic audio signal as dual monophonic audio data and

6 is a block diagram illustrating the structure of an optical recording and reproducing apparatus in accordance with the present invention.

Description of preferred embodiments of the invention

In the method for specifying an audio channel identification (ID) in accordance with the present invention, a separate channel ID is assigned to each audio channel included in the program.

Table 4 shows examples of channel IDs assigned to data streams when three streams of audio data are recorded in one program.

Table 4 Dual Monaural Dual Monaural Channel id Channel id Data stream 1 one SSS one CH1 2 Data stream 2 3 SSS 3 CH1 four Data stream 3 5 SSS 5 CH1 6

In other cases, except for the case of a double monophonic signal, channel IDs are set, such as 2n-1 (n = 1, 2 and 3). In this case, n is the same as the data stream number. In the case of a double monaural signal, channel IDs 2n-1 are set for CHO data and channel IDs 2n are set for CH1.

When the user presses the audio change key through a device such as a remote control, numbers larger than the channel ID currently being played are sequentially selected and displayed. If the user selects a channel ID, a sound data stream corresponding to the ID is selected, decoded, and output.

In the method for selecting an audio channel in accordance with the present invention, when the program changes, the audio channel selected in the previous program is tracked and selected in the next program. Therefore, when there is no sound channel before changing the program, the default sound channel is selected.

Here, it is assumed that a new data stream is introduced when data is reproduced. Sound data other than the previous data stream may be recorded in the new data stream. For example, while a single audio data stream, which is a dual monophonic signal, is recorded in the old data stream, two data streams that are not dual monophonic signals are recorded in the new data stream.

In the method of selecting an audio channel in accordance with the present invention, when there is data corresponding to the ID of the channel to be reproduced, data is selected and reproduced. When there is no corresponding data, by default the data corresponding to channel ID-1 is selected and displayed.

If there is data corresponding to the ID of the channel that was being played, the data is selected and played. When there is no corresponding data, the current ID-1 channel is searched if the current channel is evenly numbered. If there is data corresponding to channel ID-1, the data is selected and output. If the data does not exist, data corresponding to channel ID 1 is selected and output. If there is no corresponding data and the current channel is numbered oddly, the data corresponding to channel ID 1 is selected and displayed.

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

Table 5 Program 1 Program 2 Data Stream 1 (Dual Monaural) CHO; Channel 1 ID Data Stream 1 (non-dual monaural signal) Channel 1 ID CH1; Channel 2 ID Data Stream 2 (Dual Monaural) CH2; ID 3 channels Data Stream 2 (non-dual monaural signal) ID 3 channels CH3; Channel ID 4

For example, when the user presses the change sound key during program 1 playback, the sound output changes in order from CHO data stream number 1. CH1 data stream number 1, CHO data stream number 2 and CH1 data stream number 2.

If program 1 is played back when selecting a CHO of data stream 2, whose channel ID is 3, and it is required that the next program 2 be played back, a study is made whether the data of channel ID 3 exists. Since data stream 2 corresponding to channel ID 3 exists in the program 2, data stream 2 is reproduced.

If program 1 is played back when CH1 is selected for data stream 2, the channel ID of which is 4, and the next program is required to be played back, a study is made whether the channel ID 4 data exists. Since there is no data corresponding to ID 4 in program 2, it is selected and played data stream 1 with channel ID 1, which is the default channel.

In another preferred channel change method, it is examined whether a channel 3 ID obtained by subtracting 1 from channel ID 4 exists. If a channel ID exists, the channel ID is selected. If the channel ID does not exist, a data stream 1 whose channel ID is equal to 1 can be selected and played. In this case, since the channel 3 ID data exists, the channel 3 ID data is reproduced.

According to the method of the present invention, if the channel ID is numbered oddly, the channel is the main audio channel in a non-dual monophonic mode or a double monophonic signal. If the channel ID is evenly numbered, the channel is a sub-tone channel in dual monaural mode.

If the user changes the audio channel, it is preferable for the user that the channel is changed regardless of whether the audio data channel is systematized into separate audio data streams or is classified as a double monaural signal.

According to the audio channel selection method of the present invention, if an audio signal change code is received, a change is made from the main audio signal to a sub-tone signal in the corresponding audio data stream and is changed to the next audio data stream.

If the user selects one audio channel that is currently selected, the channel is kept even when the program changes.

However, if there is no corresponding audio channel, the channel should be changed to a suitable channel and the changed channel should be selected. In this case, aids to navigation, which is the default channel, are selected and played, or the channel closest to the currently selected audio channel is searched, and then it is played back (if the channel ID is evenly numbered, i.e., in case of sub-tone data, the main audio the channel can be considered the closest channel, which is the oddly numbered channel ID-1).

Therefore, if there is no audio data stream corresponding to the channel ID currently set, the channel ID is stored, the main channel is selected and displayed in the aforementioned way, or the nearest channel is selected and played, and if the audio data stream corresponding to the above channel ID appears, it is selected and output data.

This is done if the user selects and plays the sub-tone channel, then selects and plays another program that does not have a sub-tone for a short time, and selects and plays the original sub-tone if a program with a sub-tone is played. If this is not done, the user must make a change in order to properly reproduce the sub-tone.

6 is a block diagram of an optical recording and reproducing apparatus applicable to the present invention. A / V data is recorded and played back using a rewritable disc. The operation of the optical recording and reproducing apparatus can be divided into recording and reproducing.

During recording of the AV data, the encoding / decoding device 110 encodes with A / V compression the signal received externally by the predetermined compression scheme and provides information on the size of the compressed data. A digital signal processor (DSP) 120 receives A / V data from an AV encoder-decoder 110, transmits additional data for processing a correction error code (ECC), and modulates by a predetermined modulation scheme. A High Frequency Amplifier (RF AMP) 130 converts the electrical data supplied by the DSP 120 into an optical signal.

The capture unit 140 includes an actuator for recording the optical signal from the RF AMP 130 to the disc and for focusing and tracking. The servo block 150 receives the information necessary for controlling the servo device from the RF AMP 130 and the system controller 160, and controls the servo device.

System controller 160 controls the entire system, determines the encoding mode of audio data, writes data to disk, and manages data.

During data reproduction, the capture unit 140 captures an optical signal from a disk on which data is stored. Data is extracted from the optical signal. RF AMP 130 converts the optical signal from capture unit 140 into an electrical signal and extracts a servo signal to control servo devices and modulated data.

DSP 120 demodulates the modulated data of the electrical signal supplied by RF AMP 130 in accordance with the modulation scheme used to modulate the data, and eliminates additional data by conducting ECC. The servo block 150 receives the information necessary for controlling the servo device from the RF AMP 130 and the system controller 160, and performs servo operations.

An A / V encoder-decoder 110 decodes the compressed A / V data provided by the DSP 120 and outputs an A / V signal.

The system controller 160 connects the user interface, for example, it processes the user's keyboard input, controls the capture unit 140, RF AMP 130, DSP 120 and AV encoding and decoding device 110 through the above method, analyzes the audio data stream and controls the capture unit 140, RF AMP 130, DSP 120, and AV encoder-decoder 110 so as to select and play the corresponding audio data if a command is received to change the audio channel from the keyboard input device 170.

As mentioned above, in accordance with the channel ID setting method of the present invention, it is possible to trace the same channel if an audio signal is selected by setting different channel IDs for the audio data stream channels.

In accordance with the methods of selecting the sound channel of the present invention, it is possible to trace the sound mode selected by the user, even when the program or the flow of audio data changes.

Claims (16)

1. An optical recording and / or reproducing device, comprising an optical head for reading an optical signal from a disk, a radio frequency amplifier (RU) for converting the optical signal generated by the optical head into an electrical signal and extracting a servo signal and modulated data, digital signal processor (DSP) for outputting a stream of compressed data by demodulating modulated data provided by the RU, a servo block for receiving information from the RU necessary for controlling a servo device and a system controller, an A / V encoding-decoding device for decoding a compressed A / V data stream output by a digital signal processor and outputting an A / V data stream including a plurality of audio data streams, a keyboard input device for inputting a user input code, and a system controller for user interface communication via a key input device and controlling an optical head, an RU, a digital signal processor and an A / V encoding / decoding device, characterized in that the system controller is configured to search for whether there is a sub-data stream having the same channel ID as the channel ID assigned to the sub-data stream of the program that was played before this program was changed in the modified program when one program changes to another program, and select a sub-data stream having the same channel ID as the channel ID assigned to the sub-data stream of the program that was played before ogramma was modified in the modified program. 2. An optical recording and / or reproducing device, comprising an optical head for emitting incident light, and a system controller for processing an information signal for controlling incident light generated by the optical head, and for controlling said apparatus for recording audio data streams in an audio / video (A / V) data stream to a disk, wherein one of said audio data streams has dual monaural channels , characterized in that the system controller assigns corresponding different channel ID identifiers to each channel of the audio data streams in the audio / video data stream. 3. The device according to claim 2, in which the system controller assigns channel ID identifiers equal to 2n-1 (where n is the order of precedence of audio data streams), audio data streams, and assigns channel IDs equal to 2n, the second one of the dual monaural channels in said audio data streams having dual monaural channels. 4. The device according to claim 3, in which the system controller assigns the channel IDs equal to 2n-1, the first one of the dual monaural channels in the audio data streams. 5. The device according to claim 2, in which the system controller reassigns the respective different channel IDs to the audio data streams of the second program, if the audio streams of the second program do not have dual monaural channels, and to each of the double monophonic channels of the second program, if the audio streams of the second program have double monophonic channels. 6. The device according to claim 5, in which the system controller reassigns the channel IDs equal to 2n-1 (where n is the order of precedence of the audio data streams of the second program), the audio data streams of the second program, and reassigns the channel IDs equal to 2n to another one of double monophonic channels in the audio streams of the second program having double monophonic channels. 7. The device according to claim 6, in which the system controller assigns the channel IDs equal to 2n-1 to the first one of the dual monaural channels in the audio data streams of the second program. 8. An optical recording and / or reproducing device, comprising an optical head for emitting incident light, and a system controller for processing an information signal for controlling incident light generated by the optical head, and for controlling said device for reproducing a plurality of programs, each program comprising at least two streams of audio data, and one of the streams of audio data has double monaural channels, characterized in that the system controller reproduces one channel from the dual monophonic channel of one of the audio data streams of the first one of the programs, performs a transition to the second one of the programs, determines whether one channel from the dual monophonic channel of one of the audio data streams of the second program corresponds to one channel double monophonic channel of one stream of audio data of the first program, and reproduces this one channel of double monophonic channel of one stream of audio data of the second program we will, if there is such a correspondence. 9. The device of claim 8, in which the system controller reproduces one of the streams of audio data of the second program, corresponding to the aforementioned one stream of audio data of the first program having the corresponding dual monaural channel, if there is no correspondence in the determination step. 10. The device according to claim 8, in which the system controller reproduces one channel of one of the streams of audio data of the second program, the closest in order of precedence to one stream of audio data of the first program having one double monaural channel, if there is no correspondence at the stage of determination. 11. The device according to claim 8, in which the system controller reproduces the default channel of one of the audio streams of the second program, if there is no correspondence at the stage of determination. 12. The device of claim 8, in which the system controller reproduces one channel of one of the streams of audio data of the second program having a higher order of precedence than one stream of audio data of the first program having one double monaural channel, if there is no correspondence in the determination step . 13. An optical recording and / or reproducing device, comprising an optical head for emitting incident light, and a system controller for processing an information signal for controlling incident light generated by the optical head and for reproducing audio data streams in an audio / video (A / V) data stream containing a plurality of programs, each program containing at least two audio data streams with at least one channel, one of the audio data streams having dual monaural channels, characterized in that each channel has a channel ID in accordance with a predefined order of precedence in the program, and the system controller searches whether there is a second dual monaural channel of the second program having the same channel ID as the channel ID assigned to the first double monaural channel of the first program, which was played before the change, when changing the first one of the programs to the second one of the programs, and selects the second double monaural channel if the search was successful. 14. The device according to item 13, in which the system controller selects one channel of the second program having a channel selection number with a higher order of precedence than the first double monaural channel, if the search was unsuccessful. 15. The device according to item 13, in which the system controller selects one channel of the second program having the nearest channel selection number in accordance with the first double monaural channel, if the search was unsuccessful. 16. The device according to item 13, in which the system controller selects the default one of the channels of the second program, if the search was unsuccessful.

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