JPH04332918A - Character display circuit of cd reproducing apparatus and cd - Google Patents

Abstract

PURPOSE:To enhance a display quality by a method wherein a modification such as a display color, a character size, a character decoration or the like is executed to a display on the basis of character code information recorded on a CD. CONSTITUTION:Character code information recorded in a Q-channel subcode on a CD is detected via circuits 122, 126, 128 and is converted into a display data by using a character code decoder 130. A modification information detection means 131 detects modification information recorded in an escape sequence in the Q-channel subcode. A character data modification means 133 executes a modification by the modification information to the display data, outputs it as a character data string from a character data string output means 132 and displays it in a state that it is modified by a display device 90.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention is a CD (compact)
The present invention relates to a character display circuit for displaying character code information in a disc playback device and a CD, in which the display by character code information can be modified.

0002

BACKGROUND OF THE INVENTION In a CD reproducing apparatus, various displays are performed based on disc reproducing information for convenience of use. Conventional CD playback devices display information based on disc playback information by playing back character code information such as TNO (track number, track number) and TIME (time) recorded in the Q channel subcode. there were.

0003

SUMMARY OF THE INVENTION In the conventional display based on the Q-channel subcode, the shapes of displayed characters are uniform, lack expressiveness, and display quality is low.

[0004] The present invention aims to solve the drawbacks of the conventional techniques and provide a character display circuit for a CD playback device and a CD that improve display quality by making it possible to modify the display using character code information. It is something.

[0005]

[Means for Solving the Problems] The character display circuit of the CD playback device of the present invention includes a playback output means for detecting and playing back digital audio data recorded on a CD, and a playback output means that detects and plays back digital audio data recorded on a CD. character code information detecting means for detecting the character code information recorded in the sub-code area of the CD; and a character code information detecting means for detecting the character code information recorded in the sub-code area of the CD; a modification information detection means for detecting modification information recorded in the character code information, and converting the detected character code information into character data of a corresponding character pattern, and character data output means for outputting modified character data as displayable character data. Further, the CD of the present invention has character code information and modification information for modifying displayed characters based on the character code information recorded in the subcode area.

[0006]

[Operation] According to the present invention, character code information read from a CD can be displayed with modification information also read from the CD. Quality can be improved.

[0007]

[Embodiment] An embodiment of the present invention will be explained. Here, information regarding the song content (disc title, song title, , composer's name, etc.), the present invention will be applied to modify the display. Here, modification information is inserted as an escape sequence into the character code string to modify the display using the character code information.

An embodiment of a CD data format to which the present invention is applied will be described. FIG. 2 shows an overview of this data format of C to which the present invention is applied. As shown in (a), one frame has 58
It is composed of 8 channel bits, and each frame has a subcode area of 1 symbol (8 bits). The subcode is configured to be completed in 98 frames, and as shown in (b), it configures eight channels P, Q, . . . , W, each channel having 98 bits.

The Q channel is configured as shown in (c), and the mode is specified by ADR (address). Mode 1 (ADR=0001) to mode 3 (0011) have already been defined, and here mode 5 (0101) is newly defined as a character display mode regarding the song content. Note that if the appearance rate of mode 5 is set to 8/100 or less at most, predefined modes 1 to 3 can be reproduced without any problem.

The contents of the data block (72 bits) in mode 5 are shown in FIGS. 2(d) to 2(f). The data signal (specific information) in mode 5 consists of three types of data blocks shown in (d) to (f). This is classified as follows according to the first two bits (DC). DC: Data Content (displays the contents of the recorded block) 00: Control block (CB: Control
(Block, editing information) Indicates that the corresponding data block consists of control data for displaying characters. 01: Basic character block (BC: Basic Char
Acter Block, character code information (ASCII
)) Indicates that the character code information of the corresponding data block is composed of 8-bit ASCII alphanumeric character codes as standard characters. 11: Optional character block (OC: Option
al Character Block, Character code information (JIS Kanji, etc.)) The character code information of the corresponding data block is 16-bit JIS as an optional character.
Indicates that it is composed of Kanji codes.

[0011] The data format of the character code information in the above various data blocks will be explained. ■ Data format in control block CB (Figure 2 (d)) i) TBN: Total Block Number
r (4 bits) Indicates the number of character blocks (one block consists of 8 characters for standard characters and 4 characters for optional blocks) that make up one character line (
control blocks are not counted). 0001: 1 block 0010: 2 block: : 1111: 15 block

ii) RN:Repeat Num
ber (2 bits) Indicates whether this is the first data or the second data of data written twice to prevent read errors. 01: First data 10: Second data

iii) TNO: Track Num
ber (8 bits) represents the song number to which the displayed song content belongs, and only this data is composed of a BCD code. The TNO basically matches the TNO in mode 1, but if you want to enter the track number information for the next song before the end of the previous song, as described later, the TNO in mode 1 and the TNO in mode 5 will basically match. The track number display starts from the time when the TNOs match.

0000 0000: The character line in which this TNO is recorded represents data that is common to the entire disc, such as the disc title and singer's name, and may be displayed at any time. 0000 0001: 1st song Data corresponding to this song number: :
〃1001 1001:99th song
〃1111 1111: If the software side requests that characters be displayed in real time at the same time as the data is read by the player (for example, karaoke lyrics, etc.), do this.

iv) TLNO: Total Li
ne Number (12 bits) 00 indicating the number of character lines recorded in the corresponding song
00 0000 0000: No characters recorded 0
000 0000 0001: 1 line: : 1111 1111 1111: 4027 line

0016
] v) CC: Character Code (6 bits) Optional character (kanji) decoding code specification 00 0000: Consists of standard character block only, optional characters are not recorded.
not present. 00 0001: Kanji is recorded as an optional character.
00 0010: Although undetermined, depending on the character code to be set, the same 8-bit unit characters as the standard character block : may also be considered (for example, Hiragana, Katakana 11 1111 Na). 11 11
Same up to 11.

vi) SC: Select cod
e (4 bits) Classification code representing the data content of the corresponding character line. 0000: Total title of the disc 0001: Title of the corresponding song 0010: Composer 0011: Lyricist 0100: Arranger 0101: Conductor 0110: Main vocalist 0111: Performance orchestra name 1000: Performance hall 1010: Mixer: 1111:

vii) BTCN: Basic To
tal Character Number (6 bits) Represents the number of characters included in the character line of the reference character (reference character line). Using this, it is possible to control the display so that it is displayed in a well-balanced manner. 00 0000: 1 character: : 11 1111: 63 characters

viii) BLCN: Basic
Line Change Number (6 bits) In the standard character line, this is an appropriate character position designation when changing lines within the corresponding character line, and indicates the position of the beginning of the character that can be changed in the line, counting from the first character. By using this, even if the number of digits on the display on the playback device side is less than the number of characters that can be displayed in one line, a well-balanced display can be achieved, and there is a degree of freedom in selecting the grade of the display on the playback device. 00 0000: You can change lines anywhere. 00 0010: A line change may be made starting from the second character. 00 0011: A line change may be made starting from the third character. : : 11 1111: You may change the line starting from the 63rd character.

ix) OTCN:Optional
total Character Number (5 bits) Represents the number of characters included in the character line of optional characters (optional character line). 0 0000: No optional characters. 0 0001: 1 character: : 1 1111: 31 characters

x) OLCN:Optional L
ine Change Number (5 bits) Indicates the position of the appropriate character when changing the line within the corresponding character line for optional characters, counting from the first character and indicating the position of the beginning of the character that can be changed in the line. 00 0000: You can change lines anywhere. 00 0010: A line change may be made starting from the second character. 00 0011: A line change may be made starting from the third character. : : 11 1111: You may change the line starting from the 31st character.

■Data format in standard character block BC (FIG. 2(e)) i) BN: Block Number (4 bits)
It represents the order (position) of the corresponding block in one character line. This order does not include control blocks. Data written twice is counted as one. 0001: First character block 0010: Second block: : 1111: 15th block ii) RN: Repeat Number (2
bit) (same as control block)

iii) d1 to d8: alphanumeric character data in ASCII code consisting of 8 bits 0000 0
000: Alphanumeric characters in ASCII code: : 〃11
11 1110 〃1
111 1111: Non-operation. The part where this symbol is recorded does not display any characters and is simply in a standby state. Unlike space display, when the next data arrives, it is displayed by filling it with the previous character. It does not count as the number of characters. Application: Adjustment data when the number of characters on one line is not divisible by the number of blocks. Display timing when displaying characters in real time.

■ Data format in optional character block OC (FIG. 2(f)) i) BN: Block Number (4 bits)
(Same as standard character block) ii) RN:Repeat Number (2
bit) (same as standard character block) iii) D1 to D4: Kanji data in JIS code consisting of 16 bits 0000 0000 0000 0000: JIS Kanji code: 〃1111
1111 1111 1110 〃1
111 1111 1111 1111: Functions the same as a non-operation in the standard character block.

In character display in mode 5, a reference character block is always recorded so that at least alphanumeric characters can be displayed even on low-cost machines. Recording of optional characters is optional. This allows display to be made in accordance with the grade of the playback device.

Next, FIGS. 3 and 4 show examples of one character line data based on character code information constituted by a combination of the above three types of data blocks. FIG. 3 shows the case where only standard characters are recorded, and FIG. 4 shows the case where optional characters are recorded. Each block in FIGS. 3 and 4 has 72 bits, and is composed of one of the three types of data blocks (FIGS. 2(d), (e), and (f)). A series of line data is a data block (Mode 5 Q subcode data) inserted into the subcode Q channel sporadically with an appearance rate of 8/100 or less.
It is constructed by detecting and connecting.

A control block is placed at the beginning of one line of data, followed by a character block. Each block is recorded with the same data repeated several times (here twice) to prevent reading errors.

When one line of data is completed, the SC in the control block is switched, and data of a different content is subsequently recorded. When the SC is sequentially switched and recording is completed, the SC is returned to the beginning and the same data is repeatedly recorded as long as the same song continues. Information common to the entire disc, such as the disc title and singer, is also recorded repeatedly. Thereby, appropriate display can be performed even if playback is started from the middle of the song. Further, even if a reading error occurs temporarily, if correct information is reproduced afterwards, correct display can be performed. Furthermore, since data is constantly received during a song performance, the total amount of data is necessary and sufficient, and since editing is performed using editing information, data efficiency is good, and the amount of instantaneous data transmission can be small.

[0029] In the case where the block is composed of only reference characters as shown in FIG. 3, the reference character block is arranged following the first control block. The control block in the case of Fig. 3 is as follows: TBN=0100 (consisting of 4 blocks per line) CC=
00 0000 (consisting of reference blocks only) BTCN
= 10 0000 (32 characters constitute the standard character line) OTCN = 0 0000 (no optional characters). Note that if one line is set to 15 blocks (maximum TBN value is 1111), if it is composed of only standard characters, 8 characters (number of characters in 1 block) x 15 blocks = 12
It becomes 0 characters.

When the optional characters shown in FIG. 4 are recorded, standard character blocks and optional character blocks are alternately arranged following the first control block. The control block in the case of Fig. 4 is TBN
=0110 (1 line consists of 6 blocks) CC=00
0001 (recorded with optional characters) BTCN=01
1000 (24 characters make up the standard character line) OTCN=0 1100 (12 characters make up the optional character line) (Note that TBN in the control block counts the number of standard character blocks and the number of optional character blocks separately. In some cases, it is more convenient.) As shown in Figure 4, when recording optional characters, by always recording standard characters as well, even low-cost machines with displays that cannot display kanji can at least display alphanumeric characters. . Furthermore, even if kanji can be displayed, it would be convenient if the user could switch between displaying either one or both on the playback device.

[0031] If one line is set to 15 blocks (the maximum value of TBN is 1111), in the case of optional characters such as kanji that are composed of 16 bits, 4 characters x 1
Up to 5 blocks = 60 can be recorded.

For example, the display speed in the cases of FIGS. 3 and 4 is as follows. Subcode block playback speed: 75 blocks/sec Mode 5 Q Subcode appearance rate: 5/100 Number of character codes: (Kanji) 4 characters/block (English characters, Kana) 8
Characters/Block Number of characters that can be recorded: (Kanji) 75 x 5/100 x 4 =
15 characters/sec (English characters, Kana) 75 x 5/100 x 8 = 30 characters/sec Amount of characters that can be displayed: (Kanji) 15/2 = 7.5 characters/sec (in case of double writing) (English) Characters, kana) 30/2 = 15 characters/sec At this display speed, it takes time to complete the playback of one line of data, so it may take some time from the time the song starts until the content is displayed. There is. This problem can be solved by increasing the data transmission rate, but this would require a huge amount of transmission capacity and cause loss, making it impractical. Therefore, before the next song starts (before the previous song ends), the next song's character code information and song number data (TNO) are recorded in the Q subcode of mode 5, and the next song starts. The character code information of the song has already been played and stored, and the stored data is displayed when the TNO of mode 1 matches the TNO of mode 5. However, it can be displayed at apparently high speed.

[0033] Furthermore, error checking during playback is performed using CRC.
In addition to using a check code (Figure 2(c)), it also detects whether the same data is obtained twice.
Only correct data can be used and displayed. Such double checking can prevent abnormal displays from occurring.

The Q subcode data of mode 5 can be recorded not only in the song but also in the lead-in section. In this way, all song contents can be displayed immediately after the disc is loaded. If the lead-in area is small, the minimum amount of data such as the song title for each station number can be recorded.

Next, a case will be described in which the display using the character code information in mode 5 is modified. When character modification is to be performed, an escape sequence is inserted into the character code information of the Q channel subcode, and modification information for character modification is recorded.

FIG. 5 shows the general format of an escape sequence for modifying characters recorded in the Q channel subcode. Note that the modification information in this escape sequence can also be written twice as shown in FIGS. 3 and 4.

In the character code information of the Q channel, an escape sequence is inserted at a position before the character code information that is intended to instruct modification. The escape sequence starts with an escape (ESC) code FFh (h means hexadecimal) which means the start of the escape sequence, followed by a type code and an attribute parameter indicating its specific content. The type code represents the type of character modification.

A specific example of an escape sequence for character modification will be explained with reference to FIG. (a) Display position (type code: 10h) The display position on the display device is indicated by coordinates X and Y. When this is issued, only one character of the character code that follows is displayed at display positions X and Y.

(b) Display color (type code: 11
h) Indicates the display color of characters. When this is issued, subsequent character codes will be displayed in this specified color until a different display color is specified. (Continues the same qualification until it is changed.) For example, color code C is defined as follows. C=00h: Red 01h: Blue 02h: Green

(c) Character size (type code:
12h) Indicates the display size of characters. For example, the character size code S is defined as follows. S=00h: Normal 01h: Small 02h: Large

(d) Character decoration (type code: 1
3h) Indicates the decoration of characters. For example, the character decoration code CA is defined as follows. CA =00h: Normal 01h: Bold 02h: Italic 04h: Underline 08h: Outline 0Fh: Shaded

(e) Character angle (type code: 1
4h) Change the character display angle to Ang. (±180°). This character angle refers to the angle of the character itself, as shown in FIG. 7(a), for example. (f) Character string angle (type code: 15h) Set the angle of the character string to Ang. (±180°). This character string angle refers to the direction in which the character strings are arranged, as shown in FIG. 7(b), for example.

[0043] As a matter of course, it is possible to instruct multiple types of character modifications for one character. Also, when changing multiple types of character modifications at once, multiple types of escape sequences are listed before the character code. Also, if you define a special code such as FEh as an instruction to return all types of modifications to normal (code: 00h), you will not have to list individual instructions to return to normal when returning to no modification, and the amount of data will be reduced. Less is needed. An actual display example based on the above various definitions is shown in FIG. Further, a series of data of the Q subcode of mode 5 for realizing this display is shown in FIG.

Next, an embodiment of the CD reproducing apparatus of the present invention will be described. FIG. 10 shows the overall configuration of a CD playback device to which the present invention is applied. In FIG. 10, an optical pickup 10 irradiates a compact disc 12 with a laser beam and receives the reflected light. The light reception signal is input to a focus error detection circuit 16 via a preamplifier 14, and a focus error is detected. The focus error signal is supplied to a focus actuator in the optical pickup 10 via a phase correction circuit 18 and a drive amplifier 20, and focus control is performed by a focus servo.

The tracking error signal is sent to the preamplifier 2.
2. The signal is supplied to the tracking actuator in the optical pickup 10 via the phase correction circuit 24 and the drive amplifier 26, and tracking control is performed by a tracking servo. Further, the tracking error signal is supplied to a feed motor 32 via a phase correction circuit 28 and a drive amplifier 30, and feed control is performed by a feed servo.

The recording signal (HF signal) of the disc 12 detected by the optical pickup 10 is input to the digital IC 36 via the HF amplifier 34. Digital IC3
6 is a clock regeneration circuit 40 after waveform shaping the HF signal in a digitization circuit 38 for digital processing.
The frequency is compared with the reference frequency from the VCO 42. The comparison output is the CLV servo circuit 44 and the drive amplifier 46.
The disc motor 48 is controlled via the disc motor 48 to control the disc 12 at a constant linear velocity. The servo sequence controller 50 performs sequence control on focus servo, tracking servo, feed servo, and disk rotation servo.

The disc playback signal is sent to the EFM demodulation circuit 52.
After being EFM demodulated in
The AM control timing control circuit 58 sequentially reads out the data at an accurate cycle. The read data is subjected to data interpolation and data muting as necessary by a data interpolation and muting circuit 60, and then output. After being converted into an analog signal by a D/A converter 64, a sample/hold circuit 66,
At 68, the signals are divided into left and right channel signals, and outputted to output terminals 78, 80 via low-pass filters 70, 72 and amplifiers 74, 76.

The synchronization separation circuit 82 separates the synchronization signal from the disc reproduction signal, and the subcode demodulation circuit 84 demodulates the subcode from the disc reproduction signal. The control circuit 86 controls each section based on the operation of the operation keys 88 and the remote control 96 by the user, and displays information based on the demodulated subcode on the display 90. Also, drive amplifier 9
2 to drive a loading motor 94 to control the loading of the disc tray.

The remote control 96 constitutes a two-way remote control with the main body of the playback device. The remote control 96 is equipped with an operation key 98, and a command signal based on the operation is outputted from the remote control transmitting/receiving section 100 and transmitted from the infrared projecting section 102. The main body of the playback device is equipped with an infrared receiver 104 that receives an infrared signal emitted from the remote controller 96 and sends the received signal to the control circuit 8 via the remote controller transmitter/receiver 106.
6 and execute the commanded function.

Furthermore, the display information reproduced by the reproduction apparatus main body is output from the remote control transmitting/receiving section 106 and transmitted from the infrared light projecting section 108. This infrared signal is received by the infrared light receiving section 110 of the remote control 96 and displayed on the display 112 via the remote control transmitting/receiving section 100.

The RAM 93 stores character code information and escape sequences based on the Q channel subcodes of modes 1 and 5 reproduced from the compact disc 12, and stores character code information and escape sequences based on the Q channel subcodes of modes 1 and 5 reproduced from the compact disc 12.
The information is read out based on a command operation using the operation keys 98 of No. 6, and used for searching and displaying the playback position on the disc.

FIG. 1 shows an embodiment of the character display circuit according to the present invention, which is provided in the main body of the playback apparatus. The function of this character display circuit is shown in FIG.
6, a control circuit 86, etc. Character display circuit 118
In the digital audio data reproduced from the CD, an audio signal is demodulated by the reproduction output means 120 (corresponding to the portion after the EFM demodulation circuit 52 in FIG. 10). Further, the digital audio data is processed by subcode channel identification means 122 (subcode demodulation circuit 8 in FIG. 10).
4 etc.), the subcodes are detected and identified as P channel subcodes, Q channel subcodes, etc.

The Q channel data processing circuit 124 demodulates the Q channel subcodes of modes 1 to 3 to obtain track number information TNO and time information TIME, and displays this on a display (display 90 or separately). (Indicators provided)
be displayed at a predetermined position.

[0054] The specific information identifying means 126 is the Q of mode 5.
Channel subcode with identification information (ADR=0101,
(see FIG. 2(c)) and outputs it. Information classification means 1
28 converts this mode 5 Q channel subcode to DC
It is divided into character code information (standard character block data, optional character block data) and editing information (control block data) by code (see FIGS. 2(d) to 2(f)). This information is stored in RAM93. It is also output so that it can be displayed on an external device (TV monitor, etc.).

Of the character code information, optional character information is composed of JIS Kanji codes, standard character information is composed of ASCII codes, and the character data output means 13
5, each code is decoded by a character code decoder 130 into display data of a character pattern corresponding to the code.

The modification information detection means 131 detects character modification information from the escape code FFh included in the character code information. The character data modification means converts the display data of the character pattern outputted from the character code decoder 130 into display data in which character modification is performed according to the modification information detected by the modification information detection means 131. This character modification is performed only once for the display position, and for other types of modification, the same modification is continuously applied until the content of the modification is changed next time for each of the same types of modification.

The character code string output means 132 edits the character-modified display data as a character code string that can be displayed externally using editing information and outputs the edited data. This character code string data is sent to the display 90 via the display drive means 134.
information regarding the song content is displayed. The display device 90 is composed of a line display using dot display such as an LCD or an LED, and is basically capable of displaying one line. Depending on the grade of the CD playback device, it is also possible to display multiple lines. Furthermore, it is also possible to display a TV screen using a small liquid crystal or the like in the main body of the playback device.

An example of character display operation by the character display circuit 118 in FIG. 1 will be explained. Under normal playback conditions, C
The data reproduced from D is reproduced as an audio signal by the reproduction output means 120. In parallel with this, the subcode channel identifying means 122 identifies the P channel subcode and Q.
A channel subcode is identified. The Q channel subcode of mode 1 is the Q channel data processing circuit 124.
The song number and time information are demodulated and displayed on the display 90 or a separate display.

The Q channel subcode of mode 5 is identified by the specific information identifying means 126, and the Q channel subcode of mode 5 is identified by the specific information identifying means 126, and then
The information is divided into character code information and editing information, and the character code information is decoded by the character code decoder 130. Further, the modification information in the character code data is detected by the modification information detection means 13.
1 is detected. Then, the character data modification means 133 applies character modification to the decoded character display data as specified by the modification information and outputs the resultant data. The modified character display data is arranged into a character data string according to the editing information by the character code string output means 132, and is displayed as it is on the display 90 via the display drive means 134.

The demodulated character code information (including modification information) and editing information are stored in the RAM 93. As mentioned above, the same character code is repeatedly recorded in the Q subcode of mode 5 during one song, but the first one obtained is stored in the RAM 93, and from then on as long as the song continues, the necessary character code is recorded from this RAM 93. Read and display the character code. Or, for the second data, important ones,
For example, only the title of the song obtained at the beginning may be read and displayed again, and thereafter this title may continue to be displayed. This is because it can be troublesome to display the same content over and over again with changes. Then, when the music changes and the content of the character code changes, this new character code is stored in the RAM 93 and displayed. The character code of the previous song is also left in the RAM 93 and is used for subsequent display, song searches, etc.

[0061] The display contents based on the character code information include various items specified by the SC code as described above, but they may be displayed in the same order as they are reproduced (or may be displayed by switching sequentially if the display 90 is small). ) operation keys 88, 9
The display contents can be specified and displayed by specifying the SC code or display contents by 8. Furthermore, unless otherwise specified, the disc title and song title (or only the song title) can be automatically displayed. Furthermore, if optional characters are recorded, it would be convenient if one or both of the standard characters and optional characters could be displayed by the user's key operations.

[0062] When the playback of one CD is finished, that CD
All character code information is stored in the RAM 93, and even if the CD is subsequently removed from the playback device, the memory remains and is used for searching for songs the next time the CD is played. In the next reproduction, since the character code information has already been stored in the RAM 93, no new storage will be performed. In order to prevent overflow of the RAM 93, it is convenient to be able to erase data on the disk that is no longer needed by the user's key operation.

[0063] As a method of storing character code information in the RAM 93, for example, character code information of various contents for each song is stored together with a classification code (SC) assigned to each (that is, stored collectively for each song). can do. Alternatively, the various character code information for each song can be stored separately for each classification code (SC) (that is, stored collectively for each classification code). Track number information (TNO) and classification code (SC) can be expressed by a storage address. Note that the modification information is also stored as is, attached to the character code information.

[0064] When reproducing a CD for which character code information has already been stored in the RAM 93, this stored information can be effectively utilized. For example, when you insert a disc, the disc title (
SC=0000) is automatically played back to detect whether the same disc title is already stored. If it is already memorized, subsequent key operations will change the track number (TN).
In accordance with the designation of item O) (that is, the operation to locate the beginning of a song), the corresponding song title is read out from the RAM 93 and displayed. At this time, since modification information is also read out at the same time, character modification is also performed. When the character code information is played back and displayed by actually searching the position on the disc in response to key operations, the transmission rate is slow, so it takes time for the song title to be displayed. If the information is displayed based on the information stored in the RAM 93, the corresponding song title can be displayed immediately after the key designation operation. In this way, once the title of the installed disc is first identified, the rest can be done by specifying the track number or classification code by key operation (or by specifying the special key operation that corresponds to the displayed content). can be displayed instantly.

[0065] As a specific processing method for reading the character code information from the RAM 93, if various information is stored together for each song, the corresponding song number is selected by specifying the song number, and this song number is The information to which the specified classification code is assigned is read from the character code information included in the . Alternatively, if they are stored together for each classification code, the character code information of the designated classification code is selected, and the information corresponding to the designated song number TNO is read out from among them.

[0066]

[Modification example] In the above embodiment, the case where the six types of character decorations shown in FIG. 6 are applied has been described, but various other character decorations are possible. In addition, in the above embodiment, the case where the character code information of the Q subcode of mode 5 is modified is explained. ) character code information can also be modified. Further, in the above embodiment, the modification information is inserted into the character code string in the Q subcode of mode 5, but it can also be recorded in various other subcodes (including R to W channels). Further, the present invention can be applied to discs and playback devices of various CD standards such as CDI, CDV, and others.

[0067]

As explained above, according to the present invention, character code information read from a CD can be displayed with modification information also read from the CD. Display quality can be improved compared to uniform display.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a character display circuit of the present invention.

FIG. 2 is a diagram showing an example of a CD data format to which the present invention is applied.

3 is a diagram showing an example of one line of data in the format of FIG. 2 (in the case of only reference characters); FIG.

4 is a diagram showing an example of one line of data in the format of FIG. 2 (in the case of only optional characters); FIG.

FIG. 5 is a diagram showing the general format of an escape sequence for character modification.

FIG. 6 is a diagram showing a specific example of an escape sequence for character modification.

FIG. 7 is a diagram illustrating the meanings of the character angle and character string angle in FIGS. 6(e) and 6(f).

8 is a diagram showing an example of display on a display based on the definition of FIG. 6. FIG.

[Figure 9] Q of mode 5 to realize the display in Figure 8
FIG. 3 is a diagram showing a series of data of a subcode.

FIG. 10 is a block diagram showing an example of the overall configuration of a CD playback device to which the present invention is applied.

[Explanation of symbols]

12 CD 118 Character display circuit 120 Reproduction output means 128 Information division means (character code information detection means) 1
31 Modification information detection means 135 Character data output means

Claims (2)

[Claims] 1. A reproduction output means for detecting and reproducing digital audio data recorded on a CD; and a reproduction output means for detecting and reproducing digital audio data recorded on a CD; In parallel with the reproduction by the character code information detection means to detect and the reproduction output means, the C
a modification information detection means for detecting modification information recorded in the subcode area of D; converting the detected character code information into character data of a character pattern corresponding to the character code information; 1. A character display circuit for a CD reproducing apparatus, comprising character data output means for modifying the data using modified modification information and outputting it as displayable character data. 2. A CD in which character code information and modification information for modifying displayed characters based on the character code information are recorded in a subcode area.