TW454425B - Method for assigning audio channel identification, method for selecting audio channel using the same, and optical recording and reproducing apparatus suitable therefor - Google Patents

Abstract

A method for assigning a channel identification (ID) of an audio signal by which it is possible to follow up and select the audio channel selected by a user even though a program or an audio data stream is changed in an audio/video (A/V) device for reproducing a program including a plurality of audio data streams, a method for selecting audio channels using the same, and an apparatus suitable therefor are provided. The method for selecting the audio channels of an A/V data stream including a plurality of programs, each program including at least two kinds of audio data streams, each audio data stream including at least two sub-audio data streams which are not repeated and have a series of IDs according to a predetermined order of precedence, includes the steps of (a) when a program is changed to another program, searching whether there is a sub-audio data stream having a channel ID which is the same as the channel ID assigned to the sub-audio data stream of the program which was being reproduced before the program was changed, in the changed program and (b) when it is determined that there is the sub-audio data stream having a channel ID which is the same as the channel ID assigned to the sub-audio data stream of the program which was being reproduced before the program was changed in the step (a), selecting the sub-audio data stream. According to the method for selecting an audio signal, it is possible to follow up the voice mode selected by a user although a program or an audio data stream is changed.

Description

4 Printed by the Shellfish Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 5 44 2 5 File: 57 3S * pif _ _B7_ V. Description of the Invention (/) Background of the Invention 1. Field of the Invention The present invention relates to a method for identifying a specified audio channel, using A method for selecting an audio channel, and an optical recording and reproduction device suitable for the method. By specifying the audio channel identification method, it is possible to follow and select the audio channel selected by the user, even in audio / video (audio / video) devices, in order to reproduce a plurality of audio data stream (data stream ) And change the audio data string and program. 2. Description of related technologies Recently, MPEG (moving picture engineering group) and AC3 usually use compression coding method for audio signals. In a linear PCM (pulse code modulation), the audio signal is not compression-encoded but recorded. Both digital television broadcast or integrated video systems (CDS) and digital video disks (DVDs) are digital audio / video devices, and are mainly used on MPEG. When MPEG audio / video data is compiled into data strings and integrated with other data strings and used in practical applications, it is necessary to integrate these data strings into one data string. Depending on the application, additional data can be used additionally. The rotation of the MPEG system is synchronous and multiplexed video and audio data. In the MPEG system, packets are multiplexed. Packets of information In multiplexing, each video or audio data is divided into packets with data strings of appropriate length, and these packets of video and audio data are multiplexed, just like header information. Is attached 5 (Please read the notes on the back before filling this page) This paper size is applicable to the Chinese national standard (CNS> A4 size (210X297 mm) 4 5 44 2.¾. 5 73 9pif A7 B7 Ministry of Economic Affairs Printed by the Consumers' Cooperative of the Bureau of Substandard Bureau V. Invention Description (1) on the information package. As shown in Figure I, the information contained in the information package area is called the information package header, which is used as the identification data item (item) Whether it is video or audio data. The length of the packet depends on the transmission interface or application. Table 1 shows the contents of the packet header shown in Figure 1. The main items in Table 1 are Packet_start_code_prefix " 〇〇 ooor'h _ stream_id 1 byte, identifying the type of data item PST value (DTS value) Data Video data, mpeg audio data or special data In Table 1, Packet_start_code_prenx indicates the start of the packet And streamed indicates the type of data item in the information packet. For example, in the example of video data, streamed is a binary code "1110 0000" b; in the example of audio data, streamed is a binary code "1110 〇〃 * "B, where *** indicates the type of eight data strings existing from 000b to 111b. In the MPEG system, data items other than two data items are classified as dedicated data strings. A group can be used The code "1000 1101" b is used as a dedicated data string. As defined in the MPEG system standard, PTS (presentation time stamp) and DTS (decoding time stamp) each represent and decode a performance unit (presentation) in video or audio data. unit) 6 paper sizes are applicable to China National Lightweight Standard (CNS) A4 (210X297 mm) (Please read the notes on the back before filling out this page)--Order: 5 1 4 442 5

File: 5739pif A7 ____B7_ 5. Description of the invention (,) Time of use. This performance unit has a graphic structure in video data 'and an audio structure in audio data. DTS is not needed in the audio data paradigm. In addition to MPEG audio data, such as AC3 or LPCM, audio data is obtained through dedicated data strings. The content of the packet header shown in Table 2 is a dedicated data string. (Please read the precautions on the back before filling this page.) The main items in Table 2 are Packet_start_code_prefix “00 00 01, h sti.eam” d “1011 I101 ', b PST value Substream_id AC3 or LPCM Number_of_audio_channels Number of audio channels Data Printed by the Ministry of Economic Affairs-6- Central Standards Bureau Employee Consumer Cooperatives in Table 2 'Use substreamjd to identify the type of audio data compiled as AC3 or LPCM. For example, in the AC3 example, substream_id It is "1010 〇 ***" b, where *** means the above eight types of data strings similar to MPEG audio. In MPEG system, a program can have various video data strings and audio data strings. "The number_of_audio_channer item indicates the number of channels, which can be lch, 2ch '3ch, 4ch, and dual mono channel. Here, the channels and channels selected by the user are not 7 This paper size is applicable to the Chinese National Standard (CNS) A4 specification U10X297 mm) ~ — 5 Staff Consumer Cooperation of the Central Standards Bureau of the Ministry of Economic Affairs 4 A7 B7 44 2 5

File: 5 73 9p: V. Description of the Invention (%) Same, in other words, remove the dual monophony, the channel appearing above is selected as a single channel for the user, and the dual monophonic is permitted as two channels . In an MPEG-i or MPEG-2 program string, what is present in the upper layer of a video or audio information packet is called a pack. Generally speaking, a packet formed by combining a plurality of packets is regarded as a basic unit. Figure 2 shows the structure of the packet. The additional information present in the header of the packet is used as a time reference for synchronous reproduction. Table 3 shows the contents of the packet header shown in Figure 2. The main item in Table 3 is Pack_start_code “00 00 01 BA ,, h“ or The data shown is the SCR value of MPEG-2 Program_mux_rate Pack stuffing length In Table 3, Pack_start_code is the one from the beginning of the packet data code. SCR value represents time, which is the time when the packet data is transmitted to the buffer of the decoder, and this time is used to synchronize the system timing of the encoding system and the system timing of the decoding system. Program_mux_rate represents a transmission rate in multiplexed and transmitted video, audio, and dedicated data items. In order to interpret the data correctly, the data must be transmitted with a transmission rate higher than the above-mentioned transmission rate. Pack_stuffing_length 8 I ^ JU Order nn I ^ _ „(Please read the precautions on the back before filling out this page) This paper size is applicable to China National Standard (CNS) A4 (210X297 mm) 5 4 Printed by a consumer cooperative 44 2 5 File: 5 7 3 3p if A7 B7 V. Description of the Invention (Γ) indicates the number of dummy data. In addition, Figure 3 shows the correspondence between channels and audio signals. As shown in Figure 3, the audio signal is output through the decoder. The data output of the dual mono audio channel is the audio data of CHO and the audio data of CH1, which is similar to 2ch data. However, the dual mono data is different from the 2ch data. In 2ch data, the left audio signal and the right audio signal are cross-correlated, in other words, in the dual mono data. CHO and CH1 are separate audio signals. For example, in dual mono audio channels, Korean audio data can carry The CHO and American audio data can be loaded into CH1. Therefore, generally only one of the two channels is output or the audio data of CHO and CH1 are separately output through the left and right speakers. Figure 4 shows an example of a device used to decode and output the data of two single audio channels. When a selection signal is 0, the device shown in Figure 4 outputs the audio of CHO as left audio and right audio. When the selection signal is 1, its device outputs the audio of CHI as the left and right audio. When the selection signal is 2, its device outputs the audio of CH1 and the audio of CH2 as the left and right audio respectively. Figure 5 槪A method for recording or reproducing multiple audio signals as dual mono audio data is briefly shown. The primary audio data and the secondary audio data form a multiple audio audio signal. When recording data, the primary The audio data and secondary audio data are compiled into audio data strings. At this time, the primary audio data is compiled into CHO audio data and the secondary audio data is compiled into CH1 audio data. (Please read the precautions on the back before filling this page) This paper size applies to Chinese National Standards (CNS > A4 size (210X297 mm) 5 4 Printed by Shellfish Consumer Cooperative, Central Standards Bureau, Ministry of Economic Affairs 44 2 5 File 5 7 3 9pif A7 ___B7_ V. Description of the Invention (^) When the data is reproduced, the data string is interpreted into CHO audio data and CH1 audio data via multiple sound decoders. CHO audio data is the main audio data and CHI audio data is Secondary audio data. Here, it is assumed that there are a plurality of audio data strings, as is the case, when two audio data strings exist in a video / audio data string, the user can select one of the two channels. When the selected When the audio data string is dual tone data, that is, the secondary audio data string is included, and the user can select two channels. SUMMARY OF THE INVENTION The object of the present invention is to provide a method for identifying a specified channel. The designated secondary audio data string is included in the audio data string. If each audio data string is in a dual mode, it is included in the audio / video string. A plurality of audio data strings will be included. Another object of the present invention is to provide a method for selecting the same type of audio channel. By changing the input of the audio channel immediately following the user, although the program or audio data string is changed, in the audio / video device, in order to reproduce the plural An audio data string, which is permitted to be in dual mono mode. Yet another object of the present invention is to provide an apparatus suitable for the above-mentioned method for selecting an audio channel. In order to achieve the first objective, according to the provided method for specifying audio channel identification, in which channels in an audio / video data string are identified 2n-1 (n is the priority order of the audio data string, 1 · 2 · 3 · ·) Is assigned to an audio data string, which includes at least two types of audio data strings, each of which is in a dual tone mode. (Please read the precautions on the back before filling this page) Order-line_ This paper size is applicable to China National Standard (CNS) A4 specification (2I0X297 mm) Printed bags for employees ’cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs 4 4 2 5 File: 573 9pif 5. Description of the Invention (q) In order to accomplish the second objective, 'Provide a method for selecting an audio channel of an audio / video data string', which includes a plurality of programs, and each program includes at least two types of audio data strings Each audio data string includes at least two secondary audio data strings. The secondary audio data strings are not repeated and have continuous identification according to a predetermined priority order. The method includes the steps of changing one program to another program. At the time of the change, look for whether there is a secondary arm · frequency data. String in the changed eyes. This audio data string has a channel identification, which is the same as in a program that is being reproduced before the program is changed. The channel identification in the secondary audio data string assigned to this program; and this audio data string has a channel identification, which is the same as that in the program being changed In the program being reproduced, when the channel identification in the secondary audio data string assigned to this program is identified, this time the primary audio data string is selected. In order to accomplish the third purpose, an optical recording and reproduction device is provided. Including: the detection unit detects the optical signal from the optical disc, the high-frequency amplifier converts the optical signal generated by the detection unit into a telecommunication signal, and extracts the servo signal and the modulation data. The digital signal processor demodulates the demodulation provided by the high-frequency amplifier. The modulation data is output as a compressed audio / video data string. The servo unit receives the required information from the high-frequency amplifier to control its servo and system controller. It also performs servo operations. The audio and video encoding compressor interprets the digital signal processor. Provides compressed audio / video data strings and outputs audio / video data strings including multiple audio data strings, the key input unit inputs the user's key input, and the system controller executes the user interface via the key input unit 'with A7 (Please read the precautions on the back before filling this page) Zhang scale is applicable to China National Standard (CNS) M specifications (210X297 mm) Employees' Cooperatives of Intellectual Property Bureau of the Ministry of Economic Affairs, India 5 4 4 2 5

File: 5739pif A7 B7 V. Description of the invention (?) And control detection unit, high-frequency amplifier 'digital signal processor and audio video encoding compressor, in which the system controller looks for a secondary audio data string in the changed program This audio data string has a channel identification, which is the same as the channel identification in the secondary audio data string designated to this program in the program that is being reproduced before the program is changed. When changing a program to Another program and select a secondary audio data string, this audio data string has a channel identification, which is the same as the program being reproduced before the program is changed, and is assigned to the secondary audio data string of this program Channel identification. The embodiment and the accompanying drawings are described in detail as follows: Brief description of the drawings. Figure I shows the structure of a packet in the MPEG system. Figure 2 shows the packet in the MPEG system. Structure: Figure 3 shows the audio signal in each channel; Figure 4 shows an example of the device used to decode and output the data of dual single audio channels; Figure 5 shows a recording And a method for reproducing audio signals of multiple sounds as audio data of dual monotones; and FIG. 6 is a block diagram showing the structure of an optical recording and reproduction device according to the present invention. Explanation of labels' · Π0: Audio video compression encoder 120: Digital signal processor 130: High-frequency amplifier This paper size applies to China National Standard (CNS) A4 specification (210 X 297 mm) (please read the note on the back first) (Fill in this page again)

• — ·-.. Two _ · · »__-··· —- — · * * 454425 File; 57 3 9pif A7 B7 V. Description of the Invention (Clever) 140 Detection Unit 150 Servo Unit I 60 System Controller 170 According to a preferred embodiment of the key input unit, a method for identifying an audio channel according to the present invention includes designating a respective channel to identify each audio channel in a program. Table 4 shows an example of a channel identification designation data string when three audio data strings are recorded in a program. Table 4 No double tone, single tone track identification channel identification data string 1 1 CH0 1 CH1 2 Data string 2 3 CH0 3 CH1 4 Data string 3 5 CH0 5 CH1 6 (Please read the notes on the back before filling in k. (This page), νβ Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs. In the other examples, the example of removing the double tone is specified, and the channel identification is specified as 2n-i (n = 1, 2 and 3). The number is the same. "In the example of dual tone, the channel identification 2η-1 is specified as CHO data and the channel identification 2η is specified as CH1 data. When the user presses the audio conversion key via the remote control device, the paper size used is in accordance with the Chinese National Standard (CNS) A4 (210X297 mm). Printed by the Bayer Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs. 4544 25

File: 57 39pif; .. B7 V. Description of the invention (/ (;) The number of channel identifications that are greater than the current remake will be continuously selected and output. When the user selects the channel identification, the audio data string corresponding to this identification Will be selected, decoded and output. The method of audio channel selection according to the present invention. When changing a program 'the audio channel selected in the previous program is followed and selected in the next program. Thus, when the program is changed When there are no audio channels, an invalid audio channel is selected. Here's assuming that when the data is reproduced, a new data string is entered. If the audio data is different from the previous data string, this audio data may be recorded in the new Data string. For example, when a dual tone audio data string is recorded in a previous data string, two data strings that are not dual tone are recorded in a new data string. According to the present invention, in an audio channel In the selection method, when the data corresponding to the channel identification reproduction exists, the data is selected and reproduced. When there is no corresponding data, then Select and output the data corresponding to the channel identification. When the reproduced data corresponds to the channel identification, select and reproduce the data. When there is no corresponding data, if the current channel is an even number, the current channel is searched Identification-1. When data corresponding to channel identification-1 exists, select and output this data. When data does not exist, select and output data corresponding to channel identification 1. When there is no corresponding data and the current channel When it is an odd number, the data corresponding to the channel identification 1 is selected and output. Table 5 shows another example of the combination of audio data strings. This paper size is applicable to China National Standard (CNS) 8-4 specifications (210X297 mm) ) (Please read the precautions on the back before filling in this page) Alignment-4 5 44 2'5 ^ ^ One File: 5 7 3 9pif A7 B7 V. Description of the Invention (Program Table 5 Program Data String 1 (Double Mono) CHO; channel identification 1 data string 1 channel identification CH1; channel identification 2 (no dual mono) data string 2 (dual mono) CHG; channel identification 3 CH1; channel identification 4 double mono) channel identification 3 Central ministry of economy Standard Bureau employee consumer cooperatives print, for example, 'During the remake of program 1, when the user presses the audio shift key', the number of data strings i CH0, the number of data strings 1 CH1, the number of data strings 2 CHO, and CH1 of the data string number 2 sequentially changes the output audio signal. When the CHO channel identification 3 of the data string 2 is selected to reproduce the program 1 and the next program 2 is required to be reproduced, the channel identification is carefully investigated Whether the data of 3 exists, because the data string 2 corresponding to the channel identification 3 exists in the program 2 ', so the data string 2 is reproduced. When the CH1 channel identification 4 of the data string number 2 is selected to reproduce the program 1' and the reproduction is required When making the next program, carefully check whether the data of channel identification 4 exists. Since there is no data in program 2 corresponding to channel identification 4 ', channel identification 1 in data string 1 is a vacant channel, so this data string 1 is selected and reproduced. In another preferred method of changing channels, carefully investigate whether subtracting 1 from channel identification 4 results in a channel identification of 3. When this channel ID exists, select this channel ID. When this channel identification does not exist, the channel identification 1 of the data string 1 may be selected and reproduced. In this example, because the data of channel identification 3 exists, so the channel identification 15 is reproduced. This paper size applies to the Chinese national standard (CNS> Α4 standard (210 χ 297)) (Please read the precautions on the back before this page) ) • Ze ·,-°. ---------......- Γ-* · .... ---------......- Γ- * · ... Printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs j 4544 2 5 1 File: 5739pif A7 B7 V. Data of the invention description (1 of) 3. According to the method of the present invention, when the channel identification is an odd number In dual mono or no dual mono, its channel is the primary audio channel. When the channel identification is an even number, its channel is a secondary audio channel in dual mono. When the user changes the audio channel, it is more suitable to No matter how the user changes the channel, whether the channel of the audio data is classified as a separate audio data string or as a dual tone. According to the audio channel selection method of the present invention, when an audio conversion key is received, the corresponding audio Change from primary audio to secondary audio in data string and change to next audio data string When the user selects an audio channel, the currently selected channel is maintained even when the program is being changed. However, when there is no corresponding audio channel, its channel must be changed to an appropriate channel and the changed channel must be changed Select. At this time, the CHO vacant channel is selected and reproduced, or the channel closest to the currently selected audio channel is found and reproduced. In the example of audio data, the main audio channel can be considered as the closest channel, and its channel is an odd number and the channel is identified by -1). Therefore, when there is no audio data string corresponding to the currently set channel identification, this channel is stored Identify and select and output a basic channel by the above method, or select and reproduce the closest channel, and when the audio data string corresponding to the aforementioned channel identification appears' select and output this data. (. ((Please read the notes on the back before filling out this page) This paper size applies to Chinese national standards (CNS) A4 size (210Χ: 297 mm) ^ 45442

File: 5739pif A7 B7 V. Description of the invention (β) (Please read the note on the back ^ a ^ item and then ^ ^ page) In the example, the user selects and remakes a secondary audio channel after completing it. Another program is selected and reproduced within time, this program has no secondary audio 'and when a program with a secondary audio is reproduced, the original secondary audio is selected and reproduced. If you don't do this, the user will have to make changes in order to reproduce the audio this time. Fig. 6 is a block diagram of an optical recording and reproducing apparatus suitable for the present invention. The use of recordable discs to record and reproduce video / audio data. The functions of the optical recording and reproduction device can be recorded and reproduced separately. During data recording, the audio video compression encoder (AV CodeC) UO receives compression-coded audio / video signals from the outside through a predetermined compression scheme and provides information on the amount of compressed data. A digital signal processor 120 receives audio / video data provided by the audio-video compression encoder 110, designates additional data as a processed error correction code, and uses a predetermined modulation scheme to Perform modulation. The high-frequency amplifier 130 converts the telecommunication data provided by the digital signal processor 120 into an optical signal. The policy of employee consumer cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs d Β: ιπ :: ί The detection unit 140 includes a regulator, records optical signals from the high-frequency amplifier 130 on a disc, and performs focusing and tracking. The servo unit 15 receives information required from the high-frequency amplifier 130 as a control servo and system controller 160, and controls the servo. The system controller 160 controls the entire system, determines the encoding mode of the audio data, records the data on the optical disc, and controls the data. During data reproduction, the detection unit 140 detects the data stored on the optical disc as an optical signal, and extracts data from the optical signal. High-frequency amplifier The paper size is applicable to China National Standard (CNS) A4 specification (21〇 × 297 mm) A7 B7 4.5 4 4 2 5

Fi 1 e: 5 7 3: V. Description of the invention (f) The amplifier 130 converts the optical signal of the detection unit HO into a telecommunication signal, and extracts the servo signal as a control of the servo and modulation data. The digital signal processor 120 demodulates the modulation data of the telecommunication signal. The modulation is provided using a high-frequency amplifier 130 corresponding to the modulation scheme, and the additional data is removed by performing an error correction code. The servo unit 150 receives the information required from the high-frequency amplifier 130 as a control servo and system controller 160, and performs this servo operation. The audio video compression encoder 110 interprets the compressed audio / video provided by the digital signal processor 120. Data, and output audio / video signals. The system controller 160 executes a user interface. For example, the controller processes the user's on-chain input, and controls the detection unit 140, the high-frequency amplifier 130, the digital signal processor 120, and the audio and video compression encoder 110 by the method described above. And when receiving an instruction from the key input unit 170 to change the audio channel, analyze the audio data string and control the detection unit 140 'high-frequency amplifier 130, digital signal processor 120, and audio video compression encoder 110, so the selection corresponds to the reproduction Audio data. As described above, according to the channel identification specifying method of the present invention, when selecting an audio signal, it is possible to follow the same channel by following the same channel by specifying different channel identifications. According to the audio channel selection method of the present invention, it is possible to follow the audio mode selected by the user even when a program or an audio data string is changed.

1S

This paper size applies to China National Standards (CNS) A4 specifications (210X297 male thin T (please read the precautions on the back before filling this page) Threading · Printed by the Staff Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs

Claims (1)

A8B8C8D8 A / Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 4 5 442 5 File: 5 7 3 9pif Application for patent scope 1. —A method for identifying audio channel, including channel identification in an audio / video data string 2n- 1 (η is the priority full weight order of the audio data string, 1 · 2.. 3 · ..) is assigned to the audio data string, this data string includes at least two types of audio data strings, each of which Strings are in a single tone pattern. 2. The method as described in item 1 of the scope of patent application, wherein the number of channels of the dual tone data string is included in the example of the primary audio data string, and the example of the audio data string is 2η-1 and the secondary audio data string is exemplified. The audio data string is 2η. 3- —A method for identifying a specified audio channel, including assigning different channels in an audio / video data string to each of the secondary audio data strings, and including at least two audio data in the audio / video data string String, each audio data string includes at least two secondary audio data strings. 4. The method as described in item 3 of the scope of patent application, wherein, according to the priority order, the identification of the secondary audio data string is a continuous number. 5. The method according to item 4 of the scope of patent application, wherein in the priority order, the order of generating the primary audio data string is a first priority order, and the order of generating the secondary audio data string is a second priority order. 6. The method as described in item 3 of the scope of patent application, which includes in the audio data string, the identification of the audio data string is the same as the channel identification leading the secondary audio data string. 7. The method described in item 5 of the scope of the patent application, which includes the audio data string, and the identification of the audio data string is the same as that of the paper standard applicable to the Chinese National Standard (CNS) A4 (210 X 297 public) Li) L ----------- "M -------- Order ---.------ Line (Please read the precautions on the back before filling in this page) A8 B8 C8 D8 454425 File: 573 9pif 6. Channel identification of the secondary audio data string in the scope of patent application 8.-A method of selecting the audio channel of an audio / video data string, which includes multiple programs, each program including at least Types of two audio data strings. Each audio data string includes at least two secondary audio data strings. The secondary audio data strings are not repeated and have continuous identification according to a predetermined priority sequence. The method includes the following steps: U) When changing a program to another program, look for a secondary audio data string in the changed program. This audio data string has a channel identification, which is the same as the channel identification before the program is changed. Program, assigned to Channel identification in the secondary audio data string of the program; and (b) when the secondary audio data string in step (a) is determined, the audio data string has a channel identification, which is the same as that in the program being changed In the program that is currently being reproduced, when the channel in the secondary audio data string assigned to this program is identified, the current audio data string is selected. 9_ As described in item 8 of the scope of patent application, when there is no A secondary audio data string with channel identification. This audio data string has a channel identification. The channel identification is the same as the program that was being reproduced before the program was changed and is assigned to the secondary audio data string of this program. The identification of the channel additionally includes the steps of: among the secondary audio data strings of the selected program, the selected secondary audio data string is the number of channel selections with the first priority. In the method described in item 8, when there is no secondary audio data string with channel identification, this audio data string has a frequency of 20 papers and again uses the Chinese National Standard (CNS) A4 specification (21 0X297 mm) ^ nn. η line (please read the notes on the back before filling this page) Printed by the Employees 'Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 4 5 44 2 5 File: 5739pif AB B8 C8 D8 Ministry of Economics_Chengdu Bureau of Standards Zhengong Consumers' Cooperative Sixth, the patent application applies for channel identification. The channel identification is the same as the channel identification in the secondary audio data string assigned to this program in the program that is being reproduced before the program is changed. The additional steps are: Look for a secondary audio data string between the secondary audio data strings of the selected program. 'This audio data string has a channel identification. The priority of the channel identification is lower than the one being reproduced before the program is changed. In the program's priority assigned to the channel identification in the secondary audio data string of this program; and when the secondary audio data string exists, select the secondary audio data string from the secondary audio data string of the selected program This audio data string has a channel identification. The priority of the channel identification is lower than the program that is being reproduced before the program is changed. Secondary voice frequency channel head of the identified priority data string. 11. An optical recording and reproduction device, comprising: a detection unit that detects an optical signal from an optical disc; a high-frequency amplifier that converts an optical signal generated by the detection unit into a telecommunication signal, and extracts one Servo signals and modulation data; A digital signal processor outputs the demodulated modulation data provided by the high-frequency amplifier as a compressed audio / video data string; a servo unit receives the The required information controls a servo and a system controller, and the servo controlled; an audio video encoding compressor, interprets the compressed audio / video data string provided by the digital signal processor, and the output includes a plurality of One of the audio data strings, audio / video data strings; (Please read the notes on the back before filling this page) This paper size is applicable to China National Standard (CNS) A4 (210 > < 297 mm) 454425 Pile: 5739pif A8 B8 C8 D8 t, patent application scope-key input unit, input a user's key input; and a A system controller, a user interface executed by the key input unit, and the detection unit, the high-frequency amplifier, the digital signal processor, and the audio video coding compressor controlled by the system controller, wherein the system controller is in the changed program Find out if there is a secondary audio data string, this audio data string has a channel identification, which is the same as in a program that is being reproduced before the program is changed, in the secondary audio data string assigned to this program Channel identification. When changing a program to another program and selecting and selecting a secondary audio data string, this audio data string has a channel identification, which is the same as that of a program that is being reproduced before the program is changed. Channel identification in the secondary audio data string assigned to this program. (Please read the notes on the back before filling out this page) Printed by the Ministry of Economic Affairs and the Central Bureau of Standards and Printing Co., Ltd. Consumer Cooperatives 22 This paper size applies to the Shenyang National Standard (CNS) A4 specification (210 × 297 mm)