JP4499497B2 - Playback device - Google Patents

Description

The present invention relates to a recording medium on which a subcode is recorded attached to main digital data such as audio data and visual data, for example, a reproducing apparatus for a digital audio CD.

  In a CD playback device that plays a CD (compact disc) on which music information is recorded, various displays based on the disc playback information are made for convenience of use. One is to reproduce and display a movement number, so-called track number, recorded as mode 1 in a Q channel subcode, which will be described later, and time information assigned to each track number.

  As shown in FIG. 17, the CD 101 has a hole 102 in the center, and a lead-in area that is a program management area in which TOC (table of contents) data is recorded from the inner periphery toward the outer periphery. 103, a program area 104 in which program data is recorded, and a program end area, that is, a so-called lead out area 105 is formed. In a music playback CD on which music information is recorded, music data is recorded in the program area 104, and time information and the like of this music data are managed in the lead-in area 103. Further, when the CD playback device finishes reading the music data in the program area 104 and the pickup reaches the lead-out area 105, the CD playback device ends the CD playback operation.

  FIG. 18 shows an example of a CD playback device. This CD playback apparatus reads, for example, music data of the CD 101 by the pickup 112 and processes the music data by the digital signal processing circuit 116 to obtain the playback data from the digital signal output terminal 125 or the analog signal output terminal R. , L.

  The pickup 112 includes an optical element such as an objective lens, a semiconductor laser, a quadrant detector that receives a return beam from the CD 101, and the like. By calculating the output signal of the quadrant detector, an RF signal, a focus error signal, and a tracking error signal are formed. The RF signal is supplied to the analog waveform shaping circuit 114, the focus error signal is supplied to the focus servo circuit 120, and the tracking error signal is supplied to the tracking and sled servo circuit 121.

  The analog waveform shaping circuit 114 shapes the waveform of the RF signal from the pickup 112, and the output is supplied to the synchronization detection circuit 115 and the clock generation circuit 117. Based on the RF signal from the analog waveform shaping circuit 114, the clock generation circuit 117 generates a reproduction clock synchronized with the RF signal, and the reproduction clock is synchronized with the synchronization detection circuit 115, the digital signal processing circuit 116, and the rotation. This is supplied to the servo circuit 122. The synchronization detection circuit 115 detects a frame synchronization pattern from the RF signal based on the reproduction clock sent from the clock generation circuit 117 and supplies a detection signal of this frame synchronization pattern to the digital signal processing circuit 116.

  The digital signal processing circuit 116 performs RF signal reproduction processing via the synchronization detection circuit 115. More specifically, the digital signal processing circuit 116 performs processing such as demodulation of EFF modulation, decoding of an error correction code, and error interpolation. For this processing, the recovered clock from the clock generation circuit 117 and the reference clock sent from the crystal oscillator 119 are used. Also, the left and right channel digital audio signals extracted from the digital signal processing circuit 116 are extracted to the digital output terminal 125 and supplied to the D / A converter 123 to be converted into analog signals. The audio amplifier 124 amplifies the analog audio signal from the D / A conversion circuit 123 and outputs it to the analog signal output terminal R and the terminal L.

  A subcode detection circuit 118 is connected to the digital signal processing circuit 116. The sub-code detection circuit 118 detects P-channel and Q-channel data of a sub-code described later from the digital signal from the digital signal processing circuit 116, and supplies the data of each channel to the tracking and sled servo circuit 121.

  A focus error signal from the focus servo circuit 120 is supplied to the pickup 112, and focus servo is performed so that the focus position of the objective lens of the pickup 112 matches the signal surface of the CD 101. The rotation servo circuit 122 generates a rotation drive control signal based on the reproduction clock from the clock generation circuit 117 and the reference clock from the crystal oscillator 119, sends this rotation drive control signal to the spindle motor 113, and rotates the spindle motor 113. Control the behavior.

  The tracking and sled servo circuit 121 generates a tracking control drive signal based on the tracking error signal from the pickup 112, supplies the tracking control drive signal to the pickup 112, and controls the tracking operation of the pickup 112. At the same time, a control signal for driving a feeding device for threading the pickup 112 in the radial direction of the CD 101 is generated. For example, a track position control signal is generated based on data from the P channel and the Q channel, and this track position control signal is supplied to the feeding device of the pickup 112 to control the track position of the pickup 112 in the programming mode, for example.

  Here, subcode and data of P channel and Q channel will be described. The signal recorded on the CD is sampled at a sampling frequency of 44.1 kHz with one sample or one word being 16 bits. In this sampled data, one sample or 16 bits of one word are divided into upper 8 bits and lower 8 bits to form symbols, and error correction coding processing and interleaving processing are performed in units of symbols, and audio data Every 24 symbols are grouped into one frame. This corresponds to 6 samples of the left and right stereo channels.

  With 8-14 modulation, 8 bits of each symbol are converted to 14 bits. FIG. 19 shows the data structure of one frame after 8-14 modulation. One frame 135 includes a 24-channel bit synchronization pattern data area 131, a 14-channel bit subcode area 132, a program data area 133 including 12-symbol program data D1 to D12, and 4-symbol parity data P1 to P4. A parity data area 134 and another program data area 133 and a parity data area 134. In addition, in order to connect each region or data portion, a combined bit of 3 channel bits is arranged for each portion. Accordingly, one frame 135 includes a total of 588 channel bits of data.

  Further, FIG. 20 shows 98 frames 135 collected and rearranged so that each region and data portion of the frame 135 are continuous in the vertical direction. The period of 98 frames shown in FIG. 20 is a unit for completing a subcode, and is called a subcode frame. This subcode frame includes a frame synchronization pattern portion 136, a subcode portion 137, and a data and parity portion 138. This subcode frame corresponds to 1/75 second of the CD playback time.

  Here, the subcode data including the data of the P channel and the Q channel sent from the subcode detection circuit 118 in FIG. 18 is data recorded in the subcode portion 137 in FIG. FIG. 21 shows details of the data structure of the subcode frame of the subcode portion 137. The first frame F01 and frame F02 are sub-code frame synchronization patterns S0 and S1. Similar to the frame synchronization pattern, this synchronization pattern is an out-of-rule pattern of 8-14 modulation (eight to fourteen modulation: EFM). Note that the subcode detection circuit 118 in FIG. 18 detects this synchronization pattern, and detects a subcode frame break. Further, each of 8 bits of one symbol constitutes a W channel from the P channel of the subcode. For example, the P channel includes a part of each of S0 and S1 and P01 to P96.

  The P channel of the subcode has information corresponding to the presence or absence of a song, and the Q channel has absolute time information on the CD, time information of each program, song number (also called track number), movement number ( Etc.) is also included. Therefore, it is possible to control the playback operation such as the beginning of a song by the information included in the Q channel, and by displaying the information of the Q channel, the number of songs on the optical disk for music playback is displayed. You can visually check the elapsed time of the performance and the absolute time from the beginning. Furthermore, data for six channels from the R channel to the W channel of the subcode are used for displaying still images, song lyrics, and the like.

  In order to improve the operability of the CD playback device, a function of confirming the contents recorded on the CD within a short time is provided. More specifically, it is a function of automatically playing back the first part (for example, 15 seconds) of each song one after another (called a intro scan, a music scan, etc. in a commercially available CD player). With this function, the user can immediately know the music recorded on the CD.

  Such an operation mode of the CD reproducing apparatus is realized by using the TOC data of the CD. That is, the start address, end address, first song number, last song number, and the like of each song are recorded as TOC data in the program management area (lead-in area 103) of the CD. This TOC data is read by the playback device when the CD is loaded and stored in a memory inside the device. Accordingly, the above-described operation mode is realized by repeating the movement of the pickup to the start address of the music indicated by the TOC data and the subsequent reproduction operation for a predetermined time. However, such a function reproduces only the head portion of each song, and it is difficult for the user to grasp the contents or features of the song.

Accordingly, an object of the present invention is to provide a playback apparatus that allows a user to easily know audio / visual information recorded on a recording medium such as a CD within a short time.

In order to solve the above-described problem, the present invention records management information for managing a program recorded in the program area in the management area,
And the total number of programs that the management information is recorded in the program area, a reproducing apparatus for a recording position of each program, and the associated information corresponding to each program for reproducing a recording medium that has been recorded,
Including identification information indicating whether the accompanying information is digest management information, information indicating the presence or absence of digest, information indicating the total number of digests, and information indicating the recording position of the digest as a pack,
Playback means for playing back the program area and the management area;
Determining means for determining whether the accompanying information is digest management information based on the identification information reproduced by the reproducing means;
Operation means for instructing digest playback;
Storage means for storing digest address information as a table in which each program and each digest is associated with a start address and an end address;
When digest playback is instructed, the digest information instructed by the digest management information is selectively played back based on the table. When the digest address information is the last digest in the table, playback is finished so that digest playback ends. And a control unit for controlling the unit.

The digest management information according to the present invention includes information indicating a program corresponding to the digest information, information indicating the presence / absence of the digest information and the total number of digest information related to one program, and a position indicating each recording position of the digest information Information.

According to the reproducing apparatus according to the present invention, the management area of the recording medium (e.g. CD of TOC), as accompanying information corresponding to each program, the digest management information for managing the digest information of each program is recorded, Whether the accompanying information is digest management information or other accompanying information such as text information can be determined from the identification information, and accompanying information other than the digest management information can be recorded .

  Hereinafter, an embodiment of a recording medium and a reproducing apparatus according to the present invention will be described with reference to the drawings. In one embodiment, a CD is used as a recording medium. However, the present invention is not limited to this, and other types of optical disks (eg, DVD (digital video disk), magnetic tape, optical tape, semiconductor memory, etc.) are also used. The information recorded on the recording medium is not limited to audio data, and may be video data or the like.

  FIG. 1 shows a data structure of a CD subcode in this embodiment. The subcode shown in FIG. 1 is recorded as a part of the TOC data recorded in the program management area. In the case of an existing CD, the total number of programs (music pieces) and the recording position of each program are managed using 72-bit data in one frame of the Q channel subcode. More specifically, an address (absolute time) at which each movement with a value from 00 to 99 starts, the first movement number, the last movement number, and the address at which the lead-out starts are recorded. In addition to the Q channel subcode, data composed of R channel to W channel as shown in FIG. 1 is recorded as TOC data.

  The first two frames of the data composed of the R to W channels are the synchronization patterns S0 and S1. The remaining 96 frames include 96 symbols each having 6 bits. The 96 symbols are divided into 24 symbols. These 24 symbols are referred to as 1 pack, and 4 packs are referred to as 1 packet.

  ID information (ID2, ID3, and ID4) having mode information for setting a recording mode of information recorded in the pack at the head position of each pack, ID1 having identification information indicating the type of text information, and other identification information An ID area 1 in which a 24-bit ID code including the ID is recorded is arranged. After this ID area 1, a text area 2 in which text information attached to the main data is recorded in units of 8 bits is arranged. Furthermore, a CRC area 3 in which 16-bit data for error detection using a cyclic code (CRC) is recorded as an error detection code in each pack.

  Prior to description of subcodes for the R to W channels according to the present invention, a data format for recording existing graphic information on a CD will be described. 2A is a diagram schematically showing the structure of the subcode portion 137 shown in FIG. The subcode is formed of 8 bits, and the bit group forming this subcode is divided into 8 channels of P, Q, R, S, T, U, V, and W. The subcode unit 137 is a collection of 98 frames composed of P to W channels.

  The first two frames are a synchronization pattern. From the third frame to the 98th frame, a block 12 called subcode P consisting only of P channel data, a subcode Q consisting only of Q channel data And a block 11 consisting only of R to W channel data.

  In the method of recording and reproducing image information as a subcode, as shown in FIG. 2B, one symbol is formed by 6 bits of R to W channels, and the minimum data unit is formed by 24 symbols of 0 to 23. Pack. That is, the block 11 is divided into four packs. Of the 24 symbols forming the pack, the first symbol (hereinafter referred to as symbol 0) indicates the mode from the MSB (most significant bit) side, and the three digits from the LSB (least significant bit) side indicate the item. Symbol 1 following symbol 0 indicating this mode and item is an instruction indicating the type of instruction. Symbol 3 and symbol 4 following the instruction are parity Q which is an error correction code. Each symbol from symbol 4 to symbol 19 following the parity Q forms a data field and includes color information and the like. Each symbol from the symbol 20 to the symbol 23 following the data field is a parity P that is an error correction code for protecting information in the pack.

  There are four types of modes: zero mode, line graphics mode, TV graphics mode, and user mode. The zero mode is a mode in which no operation is performed on the display screen, for example. That is, this mode is for when the image is to be left as it is, and all the data in the pack is zero. The line graphics mode is a mode for displaying, for example, a song description by providing a liquid crystal display or the like on the front of the player.

  Examples of the image processing command include a command to fill the entire screen with a certain color, a command to draw a picture using two kinds of colors for a screen-like font, a command to move the entire screen in the vertical direction or the horizontal direction, etc. There is.

  As described above, in the existing method (CD graphics) in which graphics information is inserted into a subcode, a dedicated processing circuit is required to process R to W channel data, and parity is also required. Since the error correction method using P and parity Q is complicated, the processing circuit is complicated. For this reason, the existing method is not suitable for the purpose of simply recording and reproducing text information using subcodes of the R to W channels.

  Therefore, in the embodiment of the present invention, since the R to W channels are used, it can be realized with a simpler processing circuit. FIG. 3A shows the data format shown in FIG. 1 as serial data. As shown in FIG. 3A, the data of 32 bits from the beginning (only 24 bits are shown in FIG. 3A) is divided into data for each byte, and these bytes are assigned to ID1, ID2, ID3, and ID4 for identification. ID region 1 is formed. The subsequent text area 2 is also divided into data in byte units. Such processing in units of bytes makes it possible to perform processing by a Q channel signal processing method, and a simple processing circuit configuration can be achieved.

  In the data format shown in FIG. 2A, an error correction code using parity P and parity Q is used, whereas in the data format in one embodiment of the present invention, an error detection code by CRC is used. Thus, only the error is detected, and when the error is detected, the data is read again. For this reason, data is written, for example, in quadruple for each pack in the TOC, and a series of data strings are repeatedly recorded in units of packets. By such multiple recording, a complicated circuit for error correction can be omitted.

  Note that multiplex writing in pack units is not limited to quadruple writing, and the unit of multiplex writing is not limited to pack units, and for example, multiple writing may be performed in units of packets or in units of several packets.

  Further, as shown in FIG. 3B, the head ID 1 of the ID area 1 is handled with 8 bits, which is 2 bits more than the conventional 1 symbol. Furthermore, 3 bits from the MSB are the same data as in the above mode so that this playback device does not malfunction even if it is installed in an existing CD playback device that has a function of decoding the R to W channel subcodes. And an undefined code such as mode 4 (“100”) is assigned as the mode indicated by these 3 bits. By doing this, only a mode that cannot be recognized even if it is attached to an existing playback device is detected, so that the playback device only stops its operation and there is no possibility of malfunction. In addition to mode 4, undefined modes include mode 5 and mode 6. These modes can be used instead of mode 4.

  In the embodiment of the present invention in which mode 4 is indicated by ID1, the data format in the pack is ID1, ID2, ID3, ID4 divided every 8 bits (1 byte) as shown in FIG. And text bytes text 1 to 12 and a 12-bit CRC code. ID1 has an 8-bit structure as shown in FIG. 5, and as shown in FIG. 6, the contents of data handled by ID1 and the pack are defined. As described above, ID1 is 8 × h (h means a hexadecimal number, and x means a 4-bit value on the lower side) in order to indicate mode 4 with the upper bits.

  The pack data whose ID1 is (80h) has a data size to be described later. The pack data whose ID1 is (81h) identifies the disc ID, (82h) identifies the genre code, and (83h) is reserved so that it can be expanded. (84h) indicates that digest information is recorded in the pack. Furthermore, (85h) is the name of the album recorded on the disc, (86h) is the name of the song for each movement, (87h) is the name of the performer, (88h) is the name of the conductor, and (89h) is the name of the performance group. Or the orchestra name. (8Bh) indicates the composer name, (8Ch) indicates the songwriter name, and (8Dh) indicates the arranger name.

  As shown in FIG. 7, ID2 is a copy control flag for MSB. For example, when “0” is set, copying is permitted, and when “1” is set, copying is prohibited. The remaining 7 bits indicate a track number. As shown in FIG. 8, ID3 is a text start position code. For example, position code 0 indicates a genre code, position code 1 indicates a track number, and position code 2 indicates the first text.

  As shown in FIG. 9, in ID4, 4 bits from the MSB are a character code, 2 bits following the character code are a language code, and 2 bits on the LSB side are a pack number. For example, when the character code is “0000”, it indicates an ASCII code of 1 byte code, and when it is “0001”, it indicates an 8859-1 code of the same 1 byte code. Further, “1000” indicates that the MS-JIS code is a 2-byte code. The 2-bit ID4 is defined, for example, that “00” is the first language, “01” is the second language, “10” is the third language, and “11” is the fourth language. Specify the language to be recorded. Therefore, in the data structure shown in FIG. 4, data about the contents indicated by ID1 is recorded in the text bytes text1 to text12 with the character code and language specified by ID4.

  Here, as an example of the data format of mode 4, FIG. 10 shows a data structure of a pack whose ID1 is “80h”, that is, a pack indicating data on the size of each information (hereinafter simply referred to as size information). Note that one pack indicating this size information is recorded per CD. In FIG. 10, ID1 and ID4 are added as identification codes. The remaining 14 bytes (112 bits) s1 to s14 excluding 4 bytes of these identification code and CRC code are defined as shown in FIG. This data is a recording map of data recorded in the CD.

  The contents of the data are defined by two bytes, byte s1 and byte s2. Two bits on the MSB side of the byte s1 are reserved, and the subsequent two bits are a language code. The remaining 12 bits indicate the total number of packs. The maximum value of the total number of packs is 4096.

  The byte s3 indicates the total number of packs used for the album name data, and the byte s4 indicates the total number of packs used for the song name for each movement. The byte s5 indicates the total number of packs used for the player name, the byte s6 indicates the total number of packs used for the conductor name, and the byte s7 indicates the total number of packs used for the performance group name and orchestra name. . The byte s8 indicates the total number of packs used for the composer name, and the byte s9 indicates the total number of packs used for the songwriter name. The byte s10 indicates the total number of packs used for the arranger name, and the byte s11 indicates the total number of packs used for the disk ID. The byte s12 indicates the total number of packs used for data corresponding to (83h) in ID1. That is, it indicates the data amount of the portion reserved for expansion. The byte s13 is ID1 (84h), that is, indicates the total number of packs used for the digest information. Finally, byte s14 is simply a reserved byte.

  FIG. 12 shows a data structure of a pack whose ID1 is (86h) as another example of the data format of mode 4, that is, a pack indicating a song title. As shown in FIG. 12, identification information of ID1, ID2, ID3, ID4, text information of text bytes text1 to text 12, and a CRC code are recorded.

  The text bytes text1 and text2 are track overhead. This track overhead is provided at the beginning of the text information of each song title. As text1, a genre code is recorded as a binary code, and as a text2, a music title number is recorded.

  The text information of each song name starts from text3 following the track overhead, and finally the information of each song name ends with a text byte of zero code. When a 2-byte character code is used for the text byte, two zero codes are terminated. Thus, track overhead is provided when there is a next track following a zero code byte.

  FIG. 13 shows an example of the data structure of the pack whose ID1 is (86h). FIG. 13 shows that the first song name is “BAD”, the second song name is “THE WAY YOU MAKE ME FEEL”, the third song name is “SPEED DEMON”, and the fourth song name is “LIBERIAN.・ ”Is an example.

Between the song names, a text byte corresponding to text1 of (17h) is provided as a text overhead, and a text byte text2 in which data indicating the song order, for example, (01h) in the case of the first song is recorded. Also, a text byte in which (00h) is recorded is provided at the end of each song name.
The other text information is recorded in the same manner as the information related to the song name of each song.

  The above example is an example in which text information is recorded as TOC sub-codes R to W. When ID1 is (84h), the digest of the song recorded on the CD is replaced with the text information. The recorded address, for example, the absolute time is recorded as subcodes R to W. The digest means a part of the recorded content, preferably an impressive and characteristic part. Regarding other identification codes, ID2 indicates a song number, ID3 indicates the total number of digests, and ID4 indicates a pack number as in the case of text information.

  FIG. 14 shows an example of the data structure of a pack whose ID1 is (84h), that is, a pack in which digest management information is recorded. Since the digest of the first song is recorded in the first pack, ID2 is (01h), and since there is one digest in the first song, ID3 is (11h) ). The upper 4 bits of ID3 are set to 0 (no digest information) or 1 (with digest information) corresponding to the presence or absence of the digest information, and the lower 4 bits (can take values 1 to F). The total number of digests is shown. ID4 indicates the pack number.

  The start address of the digest is indicated by the three text bytes text1, text2, and text3 after ID4, and the end address of the digest is indicated by the subsequent three text bytes text4, text5, and text6. This address is, for example, absolute time information on a CD, and each byte of a text byte includes minutes (values 00 to 74), seconds (values 00 to 59), and frames (values 00 to 74). Will be recorded. In the example of FIG. 14, the start address of the digest of the first song is (1 minute 2 seconds 10 frames) and its end address is (1 minute 43 seconds 20 frames).

  In the next pack and further next pack, for example, addresses of three digests are recorded for the second music. The pack of (ID4 = 01h) includes the first digest start address (10 minutes 2 seconds 20 frames) and end address (10 minutes 20 seconds 10 frames), and the second digest start address (11 minutes 3 seconds). 10 frames) and its end address (11 minutes 44 seconds 30 frames) are recorded. In the third pack, the start address (12 minutes 50 seconds 40 frames) and end address (13 minutes 10 seconds 20 frames) of the third digest are recorded.

  In FIG. 14, only the above portions are shown, but the start addresses and end addresses of the digests related to other music pieces are recorded as R to W channel data in the same manner as described above. However, it is not necessary to record the digest of all the songs recorded on one CD, and the digest information up to the previous song is recorded by setting ID3 of the song in the middle to (00h). You may instruct.

  Note that when the above digest information is recorded in the TOC R to W channel subcode, which part is extracted as digest information can be determined by the CD producer, and the digest information can be inserted, Non-insertion can also be determined by the producer. In addition to the example of FIG. 14, various configurations are possible as a data format for recording the address data of the digest information instead of the text data. For example, ID3 may specify the digest serial number of the song. Alternatively, only the start address or end address of each digest may be recorded, and the digest may be set for a certain time (for example, 15 seconds) based on this address.

  As described above, the recording medium according to the present invention, such as a CD, is accompanied by main data (music data) and is a symbol composed of 6 bits corresponding to the R to W channels of the subcode recorded in the TOC area. The data is structured in units of packets, with 24 symbols for one pack and 4 packs for one packet, and mode information for setting the recording mode of information recorded in the pack is recorded at the top position of each pack. The information written in each pack is a record in which identification information and text information or digest information are recorded in units of 8 bits.

  An example of a reproducing apparatus for reproducing such a CD is shown in FIG. This reproducing apparatus is capable of reproducing one selected CD by the autochanger function among a plurality of CDs. The CD 41 selected by the changer function is rotationally driven by the spindle motor 43, and the recorded content is read by the optical pickup. A signal from the optical pickup 42 is supplied to a signal processing circuit 45 for digital processing via an RF signal processing circuit 44. The digital audio signal component from the signal processing circuit 45 is converted into an analog audio signal by the D / A converter 47 and taken out from the analog audio signal output terminal. Such audio data processing is the same as that of a conventional CD player.

  15 includes a subcode separation circuit 51 that separates a subcode extracted by the signal processing circuit 45 from a signal read by the optical pickup 42 into a Q channel and R to W channels, The mode information of the R and W channel subcodes separated by the code separation circuit 51 is taken out, and the disc identification circuit 66 for identifying the type of the recording medium based on the mode information and the output of the disc identification circuit 66 , A subcode processing circuit 54 for processing R to W channel subcodes sent from the subcode separation circuit 51, and a character display unit for displaying text information among the information processed by the subcode processing circuit 54 Equipped with 58.

  The subcode separation circuit 51 separates the subcode into the Q channel and the R to W channels, the Q channel subcode is supplied to the time information processing circuit 52, and the R to W channel subcode is converted into the subcode processing circuit 54. And supplied to the disc identification circuit 66. The time information processing circuit 52 supplies time information managed by the Q channel to the time display unit 53 to display the time.

  The disc identification circuit 66 extracts the mode information written in the R to W channels, and identifies the type of CD based on the mode information. That is, it is identified whether or not the inserted CD is one in which identification information and text information (or digest information) are recorded on the R to W channels. When the CD is identified as a CD in which identification information and text information (or digest information) are recorded in the R to W channels, an operation input signal is output to the subcode processing circuit 54. When the CD is a CD other than the above-described CD, particularly a CD in which graphic information is recorded on the R to W channels, an operation input signal is sent to the graphic processing circuit 48.

  When the mounted CD is a CD in which identification information and text information (or digest information) are recorded in the R to W channels, the subcode processing circuit 54 receives an operation input signal from the disc identification circuit 66 and receives the subcode. Information on each item obtained by processing the R to W channels from the separation circuit 51 based on a predetermined conversion code such as the ASCII code as described above, for example, genre information 55a, ID information 55b, digest information address 55c, Character information 55d, such as album name and player name, size information 55e, etc. are taken out and stored separately.

  The character information 55d separated by the subcode processing circuit 54 is sent to the character content separation circuit 57, and display items and contents are selected and separated in accordance with the operation of the display content switch 56 and sent to the character display unit 58. Is displayed.

  The genre information 55a separated by the subcode processing circuit 54 is sent to a control circuit 60 using a so-called CPU or the like, and control is performed so that only the genre disc or song specified by the user is reproduced. A RAM 61 is connected to the control circuit 60, and genre information designated by the user operating a genre switch in the operation unit 62 is stored in the RAM 61. The designated genre information is stored in the subcode processing circuit 54. It is determined whether or not the genre information 55a matches the genre information 55a, and only when they match, the servo circuit 65 is controlled to perform the disk reproducing operation. In the autochanger type, only the discs of a specific genre can be selected and played back by controlling the playback of only the discs having the same genre while automatically exchanging the discs.

  Further, the ID information 55b from the subcode processing circuit 54 is sent to the control circuit 60 and used to efficiently operate the autochanger mechanism. Furthermore, a digest information address (start address and end address) 55c is stored for each song and each digest. This address can be read out by the control circuit 60 and the digest can be reproduced.

  The size information 55e from the subcode processing circuit 54 is sent to the TOC read waiting time processing circuit 64. The TOC read waiting time processing circuit 64 is based on the sub-Q error information 63 indicating whether or not the Q channel data has been normally read by the signal processing circuit 45, and the size information 55e. The time required to read all of the above, that is, the waiting time is calculated and sent to the time display unit 52. This waiting time display may be performed by the character display unit 58.

  The mounted CD has a data structure as shown in FIGS. 2 and 3, and is a CD on which a graphic code including image information and a character code having a predetermined bit pattern corresponding to characters are recorded. In some cases, the graphic processing circuit 48 receives an operation input signal from the disc identification circuit 66 and performs predetermined processing on the graphic code and the character code to form display data. The graphic display circuit 49 forms a display signal from the display data from the graphic processing circuit 48 and outputs the display signal from the graphic output terminal.

  FIG. 16 is a flowchart showing an outline of the digest reproduction operation that characterizes the present invention. In the start state in FIG. 16, the CD 41 is loaded, the TOC data is read, the subcode separation circuit 51 separates the Q channel subcode and the R to W channel subcodes, and the disc identification circuit 66. Thus, it has already been determined that text information or digest information is recorded as TOC data on the loaded CD 41. In step S1, the subcode processing circuit 54 determines whether or not ID1 = (84) h.

  If ID1 = (84) h is not true, then the process moves to step S2 to determine whether ID1 = (82) h. If so, the genre information 55a included in this ID1 is stored (step S3). If ID1 is not (82) h, although not shown, whether ID1 is another code is determined in order, and character information 55d is stored for each data identified by ID1.

  If ID1 = (84h) is satisfied in step S1, the digest information address 55c is stored in step S4. The digest information address is stored as a table in which each song and each digest of the CD 41 correspond to the start address and the end address.

  In step S5, it is monitored whether the digest key in the operation unit 62 is turned on. When the digest key is turned ON, the control circuit 60 controls the servo circuit 65 to perform a cueing operation to position the reading spot at the start address of the digest of the i-th song (i = 1 in the initial setting). Made. When the cueing is completed, the digest reproduction operation starts from this start address (step S7). In step S8, a match between the current address being reproduced and the end address is detected. If there is a match, the process proceeds to the next step S9.

  In step S9, it is determined whether or not the reproduction of all the digests of the CD has been completed. If completed, the digest playback operation is completed. For this detection, for example, in a table storing digest address information, a flag or code indicating the end is stored for the address next to the last digest address information. If it is determined in step S9 that the reproduction of all digests has not been completed, the value of i is incremented by 1 in step S10, and the process returns to step S6.

  Note that the specific control method for digest reproduction is not limited to the flowchart shown in FIG. 16, and various modifications can be made. For example, digest playback can be ended by turning off the digest key during digest playback. Further, when there is a favorite song during digest playback, the enter key may be turned ON, and only the song for which the enter key is ON may be played after the digest playback ends.

  In the above-described embodiment, the TOC of the CD is the program management area. However, when the medium is, for example, a tape, the program management area corresponding to the recording medium is recorded so that the program management area is recorded at the beginning of the tape. Is provided. Furthermore, in the above-described embodiment, text information is recorded as a subcode, but it is not necessary to record text information together. Furthermore, the present invention can be applied not only to a read-only recording medium such as a CD, but also to a recordable recording medium and a recording medium having both a read-only area and a recordable area.

It is a basic diagram which shows the data format of the subcode in one Example of this invention generally. It is a basic diagram explaining the data format of the existing CD which records graphic information on R thru | or W channel, and the symbol in this data format. It is a basic diagram which shows 1 pack and 1 symbol of the data format of one Example of this invention. It is a basic diagram which shows allocation of the data format of one Example of this invention. It is a basic diagram explaining ID1 which is one of the identification information in one Example of this invention. It is a figure which shows the content of the data shown by ID1. It is a basic diagram explaining ID2 which is other identification information. It is a basic diagram explaining ID3. It is a basic diagram explaining ID4. It is a basic diagram which shows the data structure of the pack which shows size information. It is a basic diagram explaining the text byte in the pack of size information. It is a basic diagram which shows the data structure of the pack which shows the song name for every movement. It is a basic diagram which shows more concretely the data structure of the pack which shows the song name for every movement. It is a basic diagram which shows more concretely the data structure of the pack with which digest management information was recorded. It is a block diagram which shows the structure of one Example of the reproducing | regenerating apparatus by this invention. It is a flowchart for demonstrating the digest reproduction | regeneration operation | movement in one Example of this invention. It is a basic diagram which shows the area | region of the conventional music reproduction CD. It is a block diagram which shows the principal part of the conventional disc reproducing | regenerating apparatus. It is a basic diagram which shows the data of 1 frame. It is a basic diagram explaining the data structure of the whole subcode frame. It is a basic diagram which shows the data of all the channels of a subcode signal.

Explanation of symbols

1 ID area 2 Text area 3 CRC area 4 Pack 5 Packet 42 Optical pickup 45 Signal processing circuit 51 Subcode separation circuit 54 Subcode processing circuit 58 Character display section 66 Disc identification circuit

Claims (2)

Management information for managing programs recorded in the program area is recorded in the management area,
A reproducing apparatus in which the management information is reproduced and the total number of programs recorded in the program area, and the recording position of each program, a recording medium in which the accompanying information is recorded corresponding to each program,
Including identification information indicating whether the accompanying information is digest management information, information indicating the presence or absence of digest, information indicating the total number of digests, and information indicating the recording position of the digest as a pack,
Playback means for playing back the program area and the management area;
Determining means for determining whether the accompanying information is digest management information based on the identification information reproduced by the reproducing means;
Operation means for instructing digest playback;
Storage means for storing digest address information as a table in which each program and each digest is associated with a start address and an end address;
When the digest reproduction is instructed, the digest information instructed by the digest management information is selectively reproduced based on the table, and the digest reproduction is performed when the digest address information is the last digest in the table. And a control means for controlling the reproduction means so that the process ends. Incidental information other than the digest management information reproducing apparatus of a is claim 1, wherein the text information associated with the program.

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