JP2621226B2 - Digital audio tape recorder - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a digital audio tape recorder that records / reproduces character data in a subcode recording area.

[Background Art] In recent years, a DAT (Audio Tape Recorder), which is under development, has an area for recording a subcode in addition to an area for recording a PCM-converted audio signal. As the subcode, various information such as an elapsed time for each music piece, an absolute time from the beginning of the tape, and a music piece number are defined.

[Object of the Invention] The present invention makes it possible to record character (character) data as a subcode in the above-described DAT, and to rewrite song number data of the subcode without inputting new character data. DAT that can change song numbers
The purpose is to provide.

[Summary of the Invention] The present invention relates to the DAT described above, wherein when character (character) data can be recorded as a subcode, when the music number in the subcode recording area is rewritten, the already recorded character data is rewritten. Is reproduced and stored once, and control is performed so that the stored character data is recorded in the subcode recording area together with the changed song number data, thereby eliminating the need to newly record character data. is there.

FIG. 1 is a block diagram showing the internal components of a DAT according to the present invention. In this example, a rotary head type DAT (R-DA) is shown.
T) is shown as an example.

In FIG. 1, reference numeral 11 denotes a rotary drum provided with two rotary heads 13a and 13b for recording and reproducing data on and from the magnetic tape 12. It is wound diagonally over an angle of ゜. Reference numeral 14 denotes an input terminal to which an audio signal to be recorded is applied. Reference numeral 15 denotes an audio signal applied from the input terminal 14, for example, 48.
An A / D converter that samples at a KHz sampling frequency and converts it to a 16-bit digital value. 16 temporarily writes the audio signal converted to a digital value to the PCM audio data storage circuit 17 while performing an interleaving process,
After adding the error correction code, the signal processing circuit for compressing and reading out and outputting the time axis, and the PCM audio signal output from the signal processing circuit 16 and the subcode output from the subcode processing circuit 19, respectively. This is a frame synthesizing circuit for synthesizing and outputting at the timing of the recording area. Reference numeral 20 denotes a modulation circuit that performs modulation suitable for magnetic recording on the recording signal output from the frame synthesizing circuit 18, and reference numeral 21 denotes a recording amplifier that amplifies the modulated signal and supplies the amplified signal to the rotary heads 13a and 13b.

Reference numeral 22 denotes a reproduction amplifier for amplifying a reproduction signal read by the rotary heads 13a and 13b, reference numeral 23 denotes a demodulation circuit for demodulating the reproduction signal amplified by the reproduction amplifier 22, and reference numeral 24 denotes a PCM audio recording area for the demodulated reproduction signal. This is a frame decomposing circuit that decomposes and outputs data in a subcode recording area. The PCM audio signal output from the frame decomposition circuit 24 is
6, once written in the PCM audio data storage circuit 17, subjected to an error correction process, then subjected to a de-interleave process and a time axis decompression process, and supplied to a D / A converter 25. The D / A converter 25 restores the PCM-converted audio signal to an analog audio signal. The analog audio signal is amplified by an amplifier 26 and then emitted by a speaker 27.

On the other hand, during recording, the subcode processing circuit 19 creates a data format to be recorded in the subcode recording area from the storage contents of the subcode data storage circuit 28 and the subcode ID storage circuit 29, and outputs the data format to the frame synthesis circuit 18. In addition, at the time of reproduction, the sub-code in the reproduction signal output from the frame decomposition circuit 24 is temporarily stored in the storage circuits 28 and 29, and necessary data is output to the control circuit 30. The control circuit 30 controls the entire system, exchanges data with the control storage circuit 31, and sends display data to the display device 33 via the display drive circuit 32 to perform various displays. Reference numeral 34 denotes a silent period detection circuit that detects a silent period in a recording signal during recording and outputs a silent period detection signal to the control circuit 30, and 35 is controlled under the control of the control circuit 30, and includes a drum motor and a capstan motor. 36 includes [play] key, [stop] key, [record] key, [pause] key, [space] key, [character] key, [line feed] key, [cursor]
Key, [Fast forward] key, [Rewind] key, [Character] key, [Correction] key, [Delete] key, [Renumber]
The key input unit includes various keys including a key and a post-recording mode designation switch.

FIG. 2 shows the state of tracks recorded on the magnetic tape 12. As shown in FIG. 2, recording tracks having a predetermined inclination angle (about 6 degrees) are formed on the magnetic tape 12 by two rotating heads 13a. And 13b alternately and sequentially. As shown in FIG. 3, the recording track has a PCM audio recording area for 128 blocks at the center and sub-code recording areas (SUB-1, SUB-2) for 8 blocks at both ends. . The audio signal is recorded in the PCM audio recording area.
Data (pulse code modulation) to which an error correction code is added is recorded, and W1 (8 bits) composed of a sync code (8 bits) and a subcode ID is recorded in the subcode recording area as shown in FIG. , W2 (8 bits) composed of a subcode ID and a block address, parity (8 bits) for W1 and W2, and a subcode block having subcode data (256 bits) as one block, each of which is recorded by eight blocks.

The subcode ID (8 bits), the block address and the subcode ID (8 bits) are configured as shown in FIG. 5 with two blocks as one unit. That is, the upper 4 bits of the subcode ID of the even-numbered block are controlled.
The ID and the lower 4 bits are used as the data ID, and the upper 4 bits are the PNO ID
(2) The lower 4 bits are used as PNO ID (3). For the block address and subcode ID, the most significant bit is defined as "1", the upper three bits of the even numbered block are the format ID, the lower four bits are the block address, and the uppermost bit of the odd numbered block. The three side bits are used as PNO ID (1), and the lower four bits are used as a block address. As shown in FIG. 6, a start ID, which is a control signal for cueing, that is, an S-ID is provided at the third bit from the lower order among the four bits of the control ID. "1" is recorded for about 300 frames (about 9 seconds). In addition, the PNO ID (1) to PNO
In the ID (3), the absolute music number (001 to 799) of each music is recorded.

The subcode data in this subcode block (256
7) consists of four pack data of 64 bits per pack as shown in FIG. 7, and one byte 8 as shown in FIG.
Of the PC1 to PC8 bits, the upper 4 bits of PC1 are used to identify the data content of the pack data.
Is assigned as the parity of the data of PC1 to PC7. As the item (4 bits), as shown in FIG. 8, "0000" indicates no information, "0001" indicates the recording time of each program (song), "0010" indicates the absolute recording time from the beginning of the tape, In this embodiment, “1000” is assigned to character data. When the pack data is character data, the pack format is as shown in FIG. That is, the upper 4 bits of PC1 are defined as item "1000", and the next 4th bit is defined as "1" when character data is used as a search code and "0" when character data is used as a search code. The flag and the lower 3 bits are “SORT” (eg, song title, song poem, etc.) indicating the contents of the character data. The PC2 sets “1” when the MSB records the search code and the text code in the same frame. A "W" flag that becomes "0" when only one of the search code and the text code is recorded in the same frame. The next 5th to 7th bits are ASCII code and JIS as character data.
"FMT" indicating code format such as code, lower 4
The bits are "ADR" indicating the address of the pack. PC3 to PC7 are character data for a total of five characters, one for each byte, and PC8 is the parity for the PC1 to PC7. Thus, four such pack data are allocated in the subcode block, and 64 packs are recorded in one track and 128 packs are recorded in one frame (two tracks) (of which 16 packs are error correction codes).

<Operation of Embodiment> Next, the operation of the above embodiment will be described.

In a normal state, by operating the "record" key with the post-recording mode switch turned off, the audio signal applied from the input terminal 14 is converted to PCM and recorded in the PCM audio recording area on the magnetic step 12. In this case, the silent period detection circuit 34 detects a silent period in the recording signal, and outputs a silent period detection signal to the control circuit 30 when detecting a silent period of, for example, -42 dB or less from the full scale level for 4 seconds or more. The control circuit 30 determines that the falling of the detection signal is the head of the music and sends a control signal to the subcode processing circuit 19. The sub-code processing circuit 19 stores “1” as a cueing ID (start ID) in the sub-code ID storage circuit 29 and stores the song number PNO while updating it.
Each time data of "1" to "0010" is stored in the sub-code data storage circuit 28 under the control of the control circuit 30 as the data of the above-described pack format. Then, the data is read from each of the storage circuits 28 and 29 at the timing of the subcode recording area, the data of the subcode block is generated, and the data is supplied to the frame synthesizing circuit 18.
On the track 12, the PCM audio signal is recorded in the PCM audio recording area and the subcode is recorded in the subcode recording area in the track format shown in FIG.

By operating the "play" key, the data recorded on the magnetic tape 12 is reproduced by the rotary heads 13a and 13b, and the audio signal is restored to the original analog signal and emitted from the speaker 27. Further, the subcode recorded in the subcode recording area is decomposed by the frame decomposing circuit 24 and sent to the subcode processing circuit 19. The subcode processing circuit 19 sequentially stores the subcode data in the input reproduced subcode in the subcode data storage circuit 28, reads out the subcode data of the required item, and supplies the read subcode data to the control circuit 30, and the control circuit 30 For example, item "000
The program time data of "1" is given to the display device 33 via the display drive circuit 32, and the program time is displayed.

Next, a case where character data is recorded as a subcode will be described. The character data is recorded in a post-recording mode in which the post-recording mode switch is set to an ON state. In this embodiment, character data of a maximum of 33 characters is recorded. In this case, of the input character data for the predetermined number of characters, the first five characters are automatically set as a search code for cueing,
The entire input characters including the first five characters are set as text codes for display, and are controlled so that recording is performed only in the subcode recording area in a recording form suitable for each.

First, it is assumed that music for a plurality of music pieces is recorded in the PCM audio recording area on the magnetic tape 12 in the recording format described above. In the subcode recording area, the tape absolute time (ABT) of item “0010” is recorded from the beginning to the end of the tape, and the program time (PRT) of item “0001” is recorded from the beginning to the end of each song. , The start ID (S
-ID) and the music number PNO are recorded.

In the normal playback state, all the information in the subcode recording area is managed by the control circuit 30. Find the previous tape position. Then, the dubbing mode switch is turned on to input a character, and the [character] key is operated. Up to 33 characters, including spaces, can be input. The characters are input using the [character] keys of the alphabets "A" to "Z" and the [space] key for setting a space between the characters. If there is a mistake in the character input, the character to be corrected is designated by using the [cursor] key, and the character is newly input. The characters to be input may be, for example, the name of the singer, the first 33 characters of the song poem, etc. in addition to the song title. When all characters have been input, the [Line Feed] key is operated.

The control circuit 30 inputs an operation signal of each key operated for character input, and sequentially stores a key code corresponding to a predetermined area of the control storage circuit 31. Next, when the [play] key is operated, the control circuit 30 executes the control shown in the flowchart of FIG.

That is, the control circuit 30 determines whether or not the current position of the magnetic tape 12 is within the top 300 frames of the song by setting the S-ID to “1”.
(Step S1 in FIG. 10). This determination operation is performed while the user is playing back the tape 12 in a normal playback state prior to character input, and is detected by the subcode processing circuit 19 and stored in the subcode ID storage circuit 31. Is read out and checked by the control circuit 30. If the S-ID is determined to be "0" by the control circuit 30, it is determined that the current tape position is before the beginning of the music piece on which characters are to be recorded.
Controls the mechanical unit 35 to the magnetic tape up to the start of S-ID recording.
12 is fast-forwarded and stopped (step S2). Also, S-ID
Is determined to be “1”, it is determined that the current tape position is within the first 300 frames of the music to be recorded, and
By controlling the step 5, the magnetic tape 12 is rewound to the recording start end of the S-ID and stopped (step S3).

Next, the control circuit 30 reads the key code of the input character key stored in the control storage circuit 31, and reads out the key codes shown in FIGS.
The pack data of the character as shown in (i) is generated (step S4). For example, if the song name is [YESTERDAYONC
It is assumed that the user inputs a character string (representing a space) of "EMORE", followed by a [RETURN] key. The key code of the operated key is stored in the control storage circuit 31. The control circuit 30 generates pack data (FIG. 11 (b)) in which the first five characters constitute one set, and sends it to the subcode processing circuit 19.

That is, the control circuit 30 sets “1000” indicating the character mode as an item, “S” flag indicates “0” indicating a text code, and SORT indicates “000” and “W” indicating a general code.
The flag is "0" indicating only the text code, "FMT" is A
"000" indicating SCII code, address "ADR" is "000"
And outputs 8 bits and 1 byte at a time. Next, the key code of the first five characters is read from the control storage circuit 31, and
Characters are converted to 8-bit ASCII code and output, and 1-byte parity is output for the already output 7-byte data. The subcode processing circuit 19 stores the data sequentially input one byte at a time in the subcode data storage circuit 28 as one pack data. In this way, the input character string is separated every five characters thereafter,
Converted to ASCII code, item, "S" flag,
The "SORT", "W" flag, "FMT", and the data of the address "ADR" updated for each pack are sent to the subcode processing circuit 19 together with the data shown in FIGS. 11 (b) to 11 (h). This is stored in the sub-code data storage circuit 28 as pack data of the individual text codes. The key code of the [Line feed] key is converted to two ASCII codes, carriage return (CR) and line feed (LF). If the input characters are less than 33 characters as in this example, the remaining characters are not changed. As shown in Fig. 11 (f) ~
It is stored as shown in (h).

After completing the control of generating the pack data as the seven text codes, the control circuit 30 generates the pack data as the search code. For the search code, only the first five characters of the input character string are used. The control circuit 30 has "1000" indicating a character mode as an item, "S" flag indicates "1" indicating a search code, and "SORT" indicates "000" and "W" indicating a general code.
The flag is "0" indicating only the search code, "FMT" is ASC
"000" indicating the II code and the address "ADR" are output to the subcode processing circuit 19 in 8-bit and 1-byte units as "0000". Next, the first five-character key code is stored in the control storage circuit.
It reads from 31 and converts one character into an 8-bit ASCII code and outputs it, and outputs a 1-byte parity for the already output 7-byte data. Subcode processing circuit
Reference numeral 19 denotes a subcode data storage circuit 28 which uses data sequentially input one byte at a time as search code pack data.
Is stored as shown in FIG. 11 (i).

When the generation of the pack data is completed in this way, the control circuit 30 initializes the number counter N, the frame counter F, and the pack address counter PA in the control storage circuit 31 (step S5), and then controls the recording of the pack data. Execute

The sub-code data storage circuit 28 has a structure shown in FIGS.
The first to seventh pack data as the text code shown in (h) and the pack data as the search code shown in FIG. 11 (i) are stored. The control circuit 30 has an S-ID
While running the magnetic tape 12 at the beginning of the head at the rated speed, the mechanism 35 is controlled to rotate the rotating drum 11, and only the subcode recording area is in a recording state,
The other areas are controlled so as to be in the reproduction state. Then, the first pack data (FIG. 11B) as a text code corresponding to the pack address counter PA = 0 is read from the subcode data storage circuit 28. The sub-code processing circuit 19 sends the first pack data to the frame synthesizing circuit 18 at the timing of the sub-code recording area, and the first pack data is recorded in the sub-code recording area on the magnetic tape 12 over one frame. Figure 10 step S6). The control circuit 30 increments the number counter N by "1" (step S7), increments the frame counter F by "+1" (step S8), and keeps the first pack until the number counter N reaches "5" (step S9). The recording operation for one frame of data is continued (steps S5 to S9). When the first pack data is recorded for 5 frames, the process proceeds from step S9 to step S10, and the pack address counter PA is set to “+1”.
Then, assuming that the number counter N = 0 (step S11), the PA
The second pack data (FIG. 11 (c)) as the text code corresponding to = 1 is read from the subcode data storage circuit 28, and the process of recording the second pack data in one frame (step S6) is executed. Then, steps S6 to S9
By repeatedly executing the processing of (2), the second pack data is recorded over five frames, and the processing of steps S9 to S11 is repeatedly executed until it is determined that PA = 7 in step S12. By executing the processes in steps S6 to S12 until PA = 7, the first to seventh pack data as text codes are recorded on the magnetic tape 12 for 5 frames each, and a total of 35 frames for the 35th frame are recorded. 11 Recording is performed as shown in FIG.

If it is determined in step S12 that PA = 7, the control circuit 30 shifts to the control of recording the tag data as a search code.
That is, pack data (FIG. 11 (i)) as a search code is read from the sub-code data storage circuit 28.
The subcode processing circuit 19 sends this pack data to the frame synthesizing circuit 18 at the timing of the subcode recording area,
Pack data as a search code is recorded for one frame in the subcode recording area on the magnetic tape 12 (step S13). The control circuit 30 sets the frame counter F to “+
"1" (step S14), and the recording of one frame of the pack data as the search code in step S13 is continued until F = 300 is determined in step S15. By repeatedly executing the processing of steps S13 to S15, the pack data as the search code in FIG. 11 (i) is recorded for a total of 265 frames from 36 frames to 300 frames.

As a result of the above processing of steps S1 to S15, the first to seventh frames as text codes are stored in the subcode recording area at the beginning of the song on the magnetic tape 12 as shown in FIG. Pack data is recorded every 5 frames, and pack data as the same search code is repeatedly recorded in 36 to 300 frames.
When recording in the above-mentioned subcode recording area, the program time of the item "0001" is set to "0" from the beginning of the music together with the back data shown in FIGS. 11 (b) to 11 (i) of the item "1000". The tape absolute time of the item "0010" is recorded as time data continuing from the end of the previous song, the subcode ID is recorded while the song number PNO is updated, and the S-ID is recorded. It is recorded as "1" over 300 frames from the beginning of the song.

When the post-recording to the above-described sub-code recording area over the top 300 frames of the music is completed, the control circuit 30 causes the reproduction state to be set. Thereafter, when dubbing the next music piece is performed, the same operation as described above is performed again.

With the magnetic tape 12 on which the character data as the search code is thus recorded, it is possible to perform a search by song title. In this case, the dubbing mode switch is turned off, the first five characters of the title of the music to be searched are input using the [character] key, and the [character] key and the [reproduction] key are operated. The data of the first five characters of the input music title are stored in the control storage circuit 31 under the control of the control circuit 30.
Is stored. Further, the control circuit 30 controls the mechanism section 35 to transfer the magnetic tape 12 at, for example, a speed of 100 times, and during this time, the data is reproduced by the rotary heads 13 and 14. The sub-code processing circuit 19 inputs data of a sub-code recording area in the reproduced signal. When the pack data as the search code with the item “1000” and the “S” flag “1” is input, the The character data of PC3 to PC7 is transmitted to the control circuit 30. The control circuit 30 compares the transmitted reproduction character data with the data of the first five characters of the song title stored in the control storage circuit 31 and converted to ASCII code, and the matched reproduction character data is determined. The transfer of the magnetic tape 12 is stopped when it is sent, and the reproduction is performed after the start of the S-ID is located. Thus, a search with a desired music title can be performed.

In a normal reproduction state, the text code is read and displayed. That is, when the character display mode is set by operating the [character] key and then the [play] key is operated, the PCM sound is played and emitted from the speaker 27, and the playback data in the subcode recording area is It is input to the subcode processing circuit 19 via the frame decomposition circuit 24. The subcode processing circuit 19 determines the item in the input reproduction subcode and the “S” flag, and packs “1000” indicating that the item indicates the character mode and pack data “0” indicating that the “S” flag indicates the text code. The character codes of PC3 to PC7 of the pack data having parity are sequentially read out and stored in the subcode data storage circuit 28, and sent to the control circuit 30. The control circuit 30 converts the transmitted character code into display data and gives it to the display device 33 via the display drive circuit 32, and the display device 33 displays a song name corresponding to the song currently being reproduced. . The subcode processing circuit 19 compares this operation with the packed data PC3 to PC7.
Continue until a newline code appears in. The control circuit 30
The display operation is performed until the S-ID recorded at the head of the next music piece is detected. In this way, the input song can be displayed when the magnetic tape 12 is reproduced.

Next, the operation of rewriting a character on a tape on which a character has been recorded by the above-described post-recording operation will be described. Taking the tape of FIG. 11 (a) as an example, operating the [character] key to set the character display mode and operating the [play] key will cause the item "10" to be displayed.
The sub-code processing circuit sequentially takes in the pack data as the text code of "00" and the "S" flag of "0", and the song name is displayed. However, when "YESTERDAY ..." is entered, "YFSTERDAY ..." … ”
Suppose you notice this error while displaying the song title. At this point, the first to seventh pack data as the text code and the pack data as the search code are stored in the sub-code data storage circuit 28. After turning on the dubbing mode switch, the user operates the [correction] key and operates the [cursor] key to select an erroneous portion of the displayed song title and input a correct character.
Then, when the [Correction] key is operated, the control circuit 30 rewrites the pack data in the storage circuit 28 for subcode data, rewinds the tape 12 until the start end of the S-ID is detected, and again reproduces the character data in the after-recording state. Make a record.

To delete the recorded character data, the user also turns on the after-recording mode switch and then operates the [Delete] key. The control circuit 30 rewinds the tape 12 until the start of the S-ID is detected, and causes the recording to be performed again only in the subcode recording area in the after-recording state. The pack data of the character data "100" is not read out, and the character data is not recorded. In both cases of correction and deletion, the subcode
The sub-code IDs such as S-ID and PNO stored in the ID storage circuit 29 are recorded as the same data as the previous time, and the program time of the item "0001" is set such that the beginning of the S-ID is "0".
The tape absolute time of the item “0010” is also recorded as updated time data from the end of the previous song.

Next, a description will be given of a renumbering operation of rewriting the music number PNO on the tape on which the character is recorded by the above-described post-recording operation so that the music number PNO is continuous from the tape start end.

The renumbering means that the tape is played at a speed higher than the beginning of the tape, and the continuity of the PNO is determined when the S-ID indicating the beginning of the song is detected. In this way, a new PNO is rewritten and recorded in a post-recording state together with the S-ID. In this case, the S-ID may record "1", and the new PNO is equivalent to the data updated for each song from the beginning of the tape, and the time data in the subcode data, for example, the item "0001" The program time PGT is the time measured from the beginning of the song, and the absolute time ABT of the item "0010" is updated if the data of the frame before the S-ID becomes "1" is latched. Thus, the control circuit 30 can be generated at the time of post-recording. However, the character data is data input by the user, and has no uniqueness such as the above-described S-ID or PGT, nor continuity such as the PNO and ABT. Therefore,
If the same renumbering operation is performed as before,
-ID, PNO, PGT, ABT, etc. can be reliably recorded, but the already recorded data for the character data of item "1000" will be erased. The present invention solves this inconvenience.

That is, when [Renumber] is operated on the key input section 36, the control circuit 30 performs the control operation shown in the flowchart of FIG. First, the number counter M in the control storage circuit 31 is cleared as an initial setting (step S16 in FIG. 12). Next, as shown in FIG. 11 (a), the magnetic tape 12 on which the character data is already recorded is rewound to the beginning of the tape (step S17).

Here, it is assumed that a total of nine musical tones are recorded on the magnetic tape 12, and the start ID in the subcode ID as shown in FIG.
(S-ID) is recorded as “1”. The song number data (PNO) in the subcode ID is “1” to “5” for the first to fifth songs, “1” for the sixth song, and “7” for the seventh song.
No tune is recorded, the eighth tune is set to "2" and the ninth tune is set to "9".
It is recorded in a frame (FIG. 13 (b)). Therefore,
PNO is "1, 2, 3, 4, 5, 1, O
AA, 2, 9 "is recorded, and a renumbering operation for correcting this discontinuity and changing to a PNO of 1 to 9 is performed. The above “OAA” is a code indicating when the PNO is not recorded. Character data is
As shown in FIG. 13 (c), the data is recorded over the first 300 frames of each song, and is not recorded in the sixth song.

After executing the process of step S17 in FIG. 12, the control circuit 18 moves the magnetic tape 12 from the tape start end to, for example, 10 minutes.
The mechanism section 35 and the like are controlled so as to reproduce the recorded data while running at a speed of 0 times (step S18). This high-speed reproduction is performed until the end of the tape is determined in step S19. During high-speed playback, the control circuit 30 determines whether or not S-ID has been detected (step S20). This S
The detection of -ID is performed as follows. That is,
The reproduction data of the sub-code recording area given from the frame decomposition circuit 24 is input to the sub-code processing circuit 19, and the sub-code processing circuit 19 stores the sub-code data in the sub-code data storage circuit 28 and the sub-code ID in the sub-code ID. code
The ID is stored in the ID storage circuit 29 to perform a parity check and the like. Then, when an S-ID output instruction is given from the control circuit 30, an S-ID detection signal is sent to the control circuit 30 when the S-ID is detected in the subcode ID. When the S-ID detection signal is input, the control circuit 30
In step S21, the number counter M is incremented. Next, the control circuit 30 gives the subcode processing circuit 19 an instruction to output the music number data PNO. Subcode processing circuit 19
Outputs the PNO data to the control circuit 30 when the PNO is detected in the subcode ID. Control circuit 30 is given
The value of the PNO is compared with the value of the number counter M (step S2
2) If they match, that is, if the original absolute track number and the recorded PNO are the same, the above steps S18 to S2
The operation control of step 1 is repeated, and when a mismatch is detected, the process proceeds to the next step S23. In the example of FIG. 13, when the S-ID of the first to fifth music pieces is detected, PNO = M, and
When the S-ID of the music piece is detected, PNO = 1 and M = 6, and a mismatch is detected. At this point, the control circuit 30 temporarily stops the magnetic tape 12 and then performs tape playback in the 4x speed rewinding state until the S-ID becomes "0" (step S2).
3). During the rewind reproduction, the control circuit 30 outputs to the subcode processing circuit 19 an instruction for detecting the character data of the item "1000" in the subcode data together with the S-ID detection instruction. S-ID in the processing of steps S18 to S20
Even if the tape is stopped by the detection, since the tape is running at 100 times speed at this time, a considerable overrun occurs. Step S2
If the character data of the item "1000" is reproduced during the rewind, the subcode processing circuit 19
Outputs a detection signal of character data to the control circuit 30. In the example of FIG. 13, since no character data is recorded in the sixth song, the above-described character data detection signal is not output, and the control circuit 30 temporarily stops the tape when the S-ID "0" is detected. Then, only the overrun portion generated by rewinding at 4 × speed is reproduced to shift to the after-recording state from the timing at which the S-ID is recorded as “1” (step S25). That is, while the overrun portion generated by the quadruple speed rewind in step S23 is reproduced at the rated speed until the timing at which the S-ID is recorded as "1", the subcode processing circuit 19 The time data of the program time PRG of the item “0001” and the absolute time ABT of the item “0010” are received and stored in the sub-code data storage circuit.
The control circuit 30 shifts to the after-recording operation from the timing at which the S-ID is recorded as "1". During the after-recording operation, the ABT data immediately before this is advanced for each frame, and the absolute time A
Control is performed so as to be recorded in the subcode as BT data. Further, the program time PRT is recorded with the timing at which the S-ID is “1” as the initial “0”, and thereafter, the S-ID is set to “1”, and the PNO is the value of the number counter M. Set to the same value and record 300 frames. As a result, during the post-recording period, the recording of the S-ID of “1” and the PNO of “6” is performed over 300 frames, so that the ABT is continuous before and after the post-recording period, and the PRT is recorded after the post-recording period. Becomes continuous.
When this post-recording period is recorded for 300 frames, SI
Since it is the timing of the end of D, the after-recording operation is terminated (step S26), and the operation after the high-speed reproduction in step S18 is repeated. The movement of the tape at this time is shown as A in FIG. 13 (d).

When the next S-ID of the seventh music piece is detected as step S20, the number counter M is incremented and M = 7 (step S21), and the values of PNO and M are compared. In the example of FIG. 13, no PNO is recorded in the seventh piece of music, and a mismatch state is reached, and the process proceeds from step S22 to step S23. Here, the control circuit 30 determines that the item “10
A detection signal indicating the presence of character data “00” is received from the subcode processing circuit 19. As a result, the process proceeds from step S24 to step S27, in which the control circuit 39 performs control for reproducing the magnetic tape 12 for about 2 seconds and storing character data as a text code in the storage circuit 28 for subcode data. The playback time of 2 seconds is calculated in step S2
3 corresponds to the reproduction time of the overrun portion before the beginning of the S-ID at the time of 4 × speed rewind reproduction and the text code 35 frames as shown in FIG. 11 (a). It is sufficient that the text code recorded in the first 35 frames of the music is sufficiently reproduced and read during the reproduction. This text code is the character data of the item "1000" as described above, and is a character code as shown in FIGS. 11 (b) to 11 (h).
Pieces of pack data. The seven pack data are sequentially stored in the subcode data storage circuit 28. At this time, the subcode processing circuit 19 performs a parity check of the pack data, selects pack data with parity one by one from the pack data multiplex-recorded every 5 frames, and selects the pack data for the subcode data. It is stored in the storage circuit 28. Then, the control circuit 30 generates pack data (FIG. 11 (b)) having the address ADR of “0000” in the text code and generates data in which the “S” flag is changed to “1”, and uses this as a search code. (FIG. 11 (i)) in the sub-code data storage circuit 28. Next, the control circuit 30 rewinds the tape until the S-ID is detected as "0" (step
S28). Then, the overrun portion generated by the rewinding in step S28 is reproduced at the rated speed until the timing at which the S-ID is recorded as "1". During this time, the subcode processing circuit 19 causes the item " 0001 "
Program time PRG and absolute time ABT of item "0010"
Receiving time data of the sub-code data storage circuit
Stored in 28. The control circuit 30 shifts to the after-recording operation from the timing when the S-ID is recorded as "1". During the after-recording operation, the immediately preceding ABT data is incremented for each frame, and converted into a subcode as the absolute time ABT data. Control to record. Also, program time PR
T sets the timing when the S-ID is “1” as the initial “0”, and then proceeds to record it. The S-ID is set to “1”, and the PNO is set to a value that matches the value of the number counter M. Set and record for 300 frames. At the same time, the control circuit 30 causes the text code stored in the subcode data storage circuit 28 and the pack data as the search code to be recorded in the subcode area (step S29). This processing is performed in steps S5 to S15 in FIG.
Is the same as the processing of With this, during the dubbing period
S-ID is "1", PNO is "7" over 300 frames,
7 text codes are 5 each for character data
A total of 35 frames are recorded in duplicate, and the remaining 265 frames of search code pack data are recorded. Also, ABT is continuous before and after the after-recording period, and PRT is continuous after the after-recording period. When the recording of the after-recording period is performed for 300 frames, the post-recording operation ends because it is the end timing of the S-ID (step S30), and the operation after the high-speed reproduction in step S18 is repeated. The movement of the tape at this time is shown as B in FIG. 13 (d).

When the S-ID of the next eighth music piece is detected as step S20, the number counter M is incremented to M = 8 (step S21), and the values of PNO and M are compared. In the example shown in FIG. 13, the PNO is recorded as "2" in the eighth piece of music, and the PNO is in a non-coincidence state.
Move on to processing. Thereafter, the same processing as in the case of the above-mentioned seventh music is executed in steps S24 and S27 to S30,
During the post-recording period of the song, the S-ID is "1", the PNO is "8", and the same character data as those recorded,
ABT and PRT are recorded. The movement of the tape at this time is
13C is shown in FIG.

In the case of the ninth tune, the coincidence between PNO and M is determined in step S22, high-speed reproduction is performed again in step S18, and when the end of the tape is detected in step S19, the tape is rewound to the beginning of the tape as step S31 and stopped. The processing is executed.

As a result, as shown in FIG. 13 (e), the PNO is correctly recorded continuously from "1" by this renumbering operation, and the SNO which has already been recorded before the renumbering operation is recorded.
-The ID, the program time PRT, the absolute tape time ABT, and the character data are also accurately recorded without being erased.

[Effects of the Invention] As described above in detail, according to the present invention, when a renumbering operation for correctly rewriting a PNO of a magnetic tape on which character data is recorded is executed, the character data that has been recorded is erased. This makes it possible to perform accurate recording without the need for re-recording character data again.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a diagram showing recording tracks on a magnetic tape in this embodiment, FIG. 3 is a diagram showing a format of one track in FIG. FIG. 4 is a diagram showing the format of one block of a subcode recorded in the subcode recording area of FIG. 3, and FIG.
The figure shows the format of the subcode ID in the subcode block, FIG. 6 shows the format of the control ID in the subcode ID, and FIG. 7 shows the format recorded in the subcode data of FIG. FIG. 8 is a diagram showing the format of pack data, FIG. 8 is an item table showing the contents of the pack data according to the items of the pack data in FIG. 7, FIG. 9 is a pack format when the item is set to the character mode, and FIG. FIG. 10 is a flowchart showing an outline of control processing of the control circuit in the after-recording mode. FIG. 11 is a diagram showing a tape recording state and pack data when recording character pack data as a text code and a search code. Is a flowchart showing the outline of the control processing of the control circuit in the renumbering operation, and FIG. 13 is a diagram for explaining the renumbering operation. It is a diagram of. 1 ... Rotating drum, 12 ... Magnetic tape, 13a, 13b ... Rotating head, 18 ... Frame combining circuit, 19 ... Subcode processing circuit, 24 ... Frame disassembling circuit, 30 ... Control circuit,
33 display device, 36 key input unit.

Claims (1)

(57) [Claims] 1. A PCM audio signal for a plurality of songs is recorded in a PCM audio recording area, and a control signal for cueing, song number data, and character data are recorded in a subcode recording area at the beginning of each song. In the digital audio tape recorder which records / reproduces the recorded magnetic tape, when the music number data is rewritten, the magnetic tape is reproduced and the character data is read and stored. Control means for detecting the control signal and rewinding the magnetic tape to the beginning of the music to record the changed music number data and the character data stored in the storage means together with the control signal for cueing in the subcode recording area. And a digital audio tape recorder.