JP2621233B2 - Digital audio tape recorder - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to music selection control of a digital audio tape recorder that reproduces a magnetic tape on which character data is recorded in a subcode recording area.

[Prior art and its problems]

2. Description of the Related Art In recent years, a rotary head type DAT (Digital Audio Tape Recorder), which is under development, has an area for recording a subcode in addition to an area for recording an audio signal converted into PCM. Various information such as an elapsed time for each music piece and an absolute time from the beginning of the tape are defined as the subcode.

It is also considered that character (character) data such as a song title is recorded in the subcode recording area, and a search (selection of music) is performed using the character data. That is, a predetermined character at the beginning of the input characters, for example, five characters, is set as a search code, and input characters including the first five characters (eg, up to 33 characters) are set as a text code. Then, the same search code is continuously recorded at, for example, 265 frames at the beginning of each song, and the text code is recorded a plurality of times before or after, for example, 35 frames. However, since the same search code is multiplex-recorded over 265 frames, any track can be reliably reproduced even at high speed reproduction such as 100 times speed. It is possible to easily select a music piece by performing a match comparison with. In addition, at the time of constant speed reproduction, which is a normal reproduction speed, the above text code is read, and characters such as a song title can be displayed.

However, in the above-described search control, the search code is read by high-speed reproduction, and the comparison with the input character is performed. Therefore, only the five characters included as the search code can be searched.

Therefore, when a plurality of songs having the same song name as the first five characters are recorded, a song different from the desired song may be reproduced.

[Object of the invention]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described inconvenience, and it is an object of the present invention to provide a digital audio tape recorder capable of performing a search by using at least the number of characters included as a search code.

[Gist of the invention]

The present invention has a configuration in which, by high-speed reproduction, first, a search code is read and matched with an input character, and then the text code of a tune for which a match is detected is read by constant-speed reproduction and matched with the input character. Things.

〔Example〕

<Structure of Embodiment> FIG. 1 is a block diagram showing the internal components of a DAT according to the present invention. Here, a rotating head type DAT (R-DA
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 / reproducing to / from the magnetic tape 12, and the magnetic drum 12 is attached to the rotary drum 11 during recording / reproducing. 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 recording circuit 28 and the subcode ID recording circuit 29 and outputs the data format to the frame synthesizing 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]
This is a key input unit having various keys including a key, a [fast forward] key, a [rewind] key, a [search] key, and a dubbing mode designation switch.

FIG. 2 is a table showing a part of registers and counters set in the control storage circuit 31. That is, the control storage circuit 31 is provided with 10 bits for the frame counter F used for the after-recording operation, 3 bits for the pack address counter PA and 3 bits for the number counter N, and the character code registers D1 to D1 to be used for the search operation.
D5 is 8 bits each, input character registers K1 to K34 are 5 bits each
In addition to being provided as bits, various registers such as a display register and an operation register are configured.

FIG. 3 shows a search circuit provided in the control circuit 30. In the figure, 37 and 38 are 8-bit latches, 39 is a coincidence detecting circuit for detecting coincidence of data of the latches 37 and 38, 40 is a shift register having a capacity of 5 bits, and 41 is each bit of the shift register 40. This is an AND circuit for determining the contents.

FIG. 4 shows the state of the tracks recorded on the magnetic tape 12. As shown in FIG. 4, 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. 5, in the recording track, a PCM audio recording area for 128 blocks is formed at the center, and subcode recording areas (SUB-1, SUB-2) for 8 blocks are formed at both ends. . The audio signal is recorded in the PCM audio recording area.
(Pulse code modulation) and data to which an error correction code is added are recorded. In the subcode recording area, as shown in FIG. 6, W1 (8 bits) comprising a sync code (8 bits) and a subcode ID , Subcode ID and block address, and W2 (8 bits).
8), and eight sub-code blocks each including the sub-code data (256 bits) as one block.

The subcode ID (8 bits), the block address and the subcode ID (8 bits) are configured as shown in FIG. 7 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. 8, a start ID serving as a cueing control signal, that is, an S-ID is provided in the third bit from the lower order of 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
The bit) consists of four pack data of 64 bits per pack as shown in FIG. 9, 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 shown in FIG. 10, "0000" indicates no information, "0001" indicates the recording time of each program (song), and "0010" indicates the absolute recording time from the beginning of the tape, as shown in FIG. In this embodiment, “1000” is assigned to character data. The pack format when the pack data is character data 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 lower 3 bits are “SORT” (eg, song title, lyrics, etc.) indicating the content of the character data. PC2 is “1” when the MSB records the search code and text code in the same frame, and "W" flag which becomes "0" when only one of the search code and text code is recorded in the frame, the next 5th to 7th bits are character data as ASCII code, JIS code, etc. code format "FMT",
The lower 4 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
A pack is recorded in 128 packs 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, the audio signal applied from the input terminal 14 is converted to PCM by operating the “record” key with the post-recording mode switch turned off, and is recorded in the PCM audio recording area on the magnetic tape 12. In this case, the silent period detection circuit
At 34, a silent period in the recording signal is detected. When a silent period of, for example, -42 dB or less from the full scale level is detected for 4 seconds or more, a silent period detection signal is output to the control circuit 30. 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 (star ID) in the sub-code ID storage circuit 29, stores the song number PNO while updating it, and stores the item “000”.
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 storage area, the data of the subcode block is generated and given to the frame synthesizing circuit 18, so that the magnetic tape
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.

<Character Dubbing Operation> 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 5 characters are input.
Characters are automatically set as a search code for cueing, and the entire input characters including the first five characters are set as text codes for display, and are recorded only in the subcode recording area in a recording format suitable for each. Is controlled to be performed.

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 characters, 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 the "cursor" key, and the input is performed by newly inputting the character. The characters to be input may be, for example, the singer's name, the first 33 characters of the lyrics, etc. in addition to the song name. 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 corresponding key codes in the input character registers K1 to K34 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. 12). This judgment operation is detected by the subcode processing circuit 19 while the user is reproducing the tape 12 in the normal reproduction state prior to the character input, and is stored in the subcode ID storage circuit 31. This is performed by the control circuit 30 reading and checking the ID. When the control circuit 30 determines that the S-ID is "0", it determines that the current tape position is before the beginning of the song in which the character is to be recorded, and controls the mechanism unit 35 to control the S-ID. The magnetic tape 12 is fast-forwarded to the recording start end and stopped (step S2). Also, S
-If the 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 the mechanism 35 is controlled to control the magnetic tape to the recording start end of the S-ID. 12
Rewind and stop (step S3).

Next, the control circuit 30 reads the key code of the input character key stored in K1 to K34 of the control storage circuit 31, and
The pack data of the character as shown in FIGS. (B) to (i) is generated (step S4). For example, as a song title String ( Represents a space), followed by a [new line] key. The key codes of the operated keys are stored in K1 to K34 of the control storage circuit 31. Control circuit 30
Generates pack data (FIG. 13 (b)) in which the first five characters stored in K1 to K5 are a set, and sends the pack data 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 codes of the first five characters are read out from K1 to K5 of the control storage circuit 31, one character is converted into an 8-bit ASCII code and output, and one byte of the already output seven-byte data is output. Output parity. The subcode processing circuit 19
The data sequentially input byte by byte is stored in the subcode storage circuit 28 as one pack data. In this way, the input character string is also separated every five characters and converted to ASCII code, and then the item, "S" flag, "SORT", "W" flag, "FMT" and one pack The data is sent to the subcode processing circuit 19 together with the data of the address "ADR" to be updated, and is stored in the subcode data storage circuit 28 as pack data of seven text codes shown in FIGS. 13 (b) to 13 (h). Is done. In addition, [line feed]
The key code of the 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 "NULL" code is used as the remaining characters (Φ) is from Fig. 13 (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 sets “1000” indicating the character mode as the item, “S” flag indicates “1” indicating the search code, “SORT” indicates “000” indicating the general code,
“W” flag indicates “0” indicating only search code, “FM”
"T" is "000" indicating an ASCII code, and the address "ADR" is "0000" and output to the subcode processing circuit 19 in 8-bit and 1-byte units. Next, the key codes of the first five characters are read from K1 to K5 of the control storage circuit 31, and one character is composed of 8 bits.
It converts to ASCII code and outputs it, and outputs 1-byte parity for the already output 7-byte data.
The subcode processing circuit 19 stores the data sequentially input one byte at a time as search code pack data in the subcode data storage circuit 28 as shown in FIG. 13 (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. 13 (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. 13 (b)) as the 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. 12 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 data until the number counter N reaches "5" (step S9). The recording operation for one frame is continued (steps S5 to S9). When the first pack data has been recorded for 5 frames, step S9 is performed.
Move to S10, set pack address counter PA to "+1"
Then, assuming that the number counter N = 0 (step S11), the PA
The second pack data (FIG. 13 (c)) as a text code corresponding to = 1 is read from the subcode data storage circuit 28, and the process of recording one frame of the second pack data (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. Recording is performed as shown in FIG.

If it is determined in step S12 that PA = 7, the control circuit 30 shifts to recording control of pack data as a search code.
That is, pack data (FIG. 13 (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. 13 (i) is recorded for a total of 265 frames from 36 frames to 300 frames.

By the processing of the above steps S1 to S15, as shown in FIG. 13 (a), the first to seventh frames as the text code are stored in the subcode recording area at the head of the music on the magnetic tape 12. Are recorded every 5 frames, and the same search code is repeatedly recorded in 36 to 300 frames. When recording in the above-described subcode recording area, the program time of the item "0001" is set to "0" from the beginning of the music together with the pack data shown in FIGS. 13 (b) to (i) of the item "1000". Is recorded while being updated from the above, the tape absolute time of the item "0010" is recorded as time data continued from the end of the previous song, and the subcode ID
The song number PNO is recorded while being updated, and the S-I
D is recorded as "1" over 300 frames from the beginning of the song.

When the post-recording to the above-described subcode recording area over the top 300 frames of the music is completed, the control circuit 30 shifts to the reproduction state. When performing the transition and post-recording of the next music, the same operation as described above is performed again.

<Character Display Operation> Next, an operation for displaying a character by using the magnetic tape on which character data is recorded as shown in FIG. 11A by the after-recording operation will be described.

The display of the character is performed during normal constant-speed reproduction and during high-speed reproduction such as 100-times speed. Of the pack data as character data of the item "1000" stored in the subcode data storage circuit 28 by the subcode processing circuit 19 at the time of constant speed or high speed reproduction, the "S" flag is set to "0" at the time of constant speed reproduction. PC3 ~ P in search code with "S" flag "1" at high speed playback
The control circuit 30 reads the code of the character C7 and sequentially stores it as display data in the display register of the control storage circuit 31, and further reads this display data to read the display drive circuit 32.
The character is displayed by sending the character to the display device 33 via the. Here, the pack data of the item "1000" and the "S" flag of "0" is text code character data, and the first to seventh pack data are each composed of 5 frames as shown in FIG. Since it is multiplex-recorded, it has enough redundancy that it can be reproduced without error during constant-speed reproduction.

Also, the pack data of the item “1000” and the “S” flag of “1” is the character data of the search code,
As shown in FIG. 13 (a), the search code pack data is
Since it is multiplex-recorded over 265 frames, it has enough redundancy that it can be reproduced without error during high-speed reproduction. That is, at the time of high-speed reproduction, the rotating heads 13a and 13b scan over a plurality of oblique recording tracks as shown in FIG. The multiple recording of the search code over 265 frames is set to the number of frames that can reliably reproduce the data of any track even in such a head scan at the time of high-speed reproduction.

<Search Operation Based on Character Data> Next, in the case where only the tune on which the desired character is recorded is reproduced by using the magnetic tape on which the character data is recorded as shown in FIG. Will be described.

In the search operation of the present embodiment, when the same character as the recorded character is input, the music is selected. For example, as shown in FIG. When selecting a song (A song) in which a character is recorded, the search code for this A song is the first five characters "YESTE"
It is. On this same tape It is assumed that a song (B song) in which the character is recorded is recorded. The search code of the B tune is also the first five characters “YESTE”. Therefore, in a tape in which the B tune is recorded before the A tune, to search from the beginning of the tape and select the A tune, in the conventional search operation, the match with the input character is detected only by the search code. Therefore, a match is detected by the search code of the B tune, and the B tune is reproduced. In this embodiment, in order to eliminate this inconvenience, control is performed such that the text code recorded in the song A is also searched and a song in which all characters including a maximum of 33 characters match is selected. Thus, when performing a search, the user inputs all the characters recorded in advance in the music to be searched. In this case, it is assumed that character data as a song title is recorded on the magnetic tape in the format shown in FIG. 13 (a) at the beginning of each song. Each time the [character] key is operated, the control circuit 30 stores the key codes corresponding to the input character registers K1 to K34 of the control storage circuit 31.
Here, the key codes of the [space] key and the last input [line feed] key are also stored in the above K1 to K34. In this case, for example Key input. When the [Search] key is operated after this character input, the control circuit 30 executes the control operation shown in the flowchart of FIG. When the [Search] key is operated without any character input, the operation becomes invalid and no operation is performed. If the [Search] key is operated immediately after the [Character] key is input without operating the [Line Feed] key, the control circuit 30 controls the input character registers K1 to K1.
Next to the last part of the character code stored in K34,
Automatically store "new line" code.

Then, the operation of the [Search] key causes the control circuit 30
Executes the respective processes shown in the flowchart of FIG. First, the control circuit 30 clears the pack address counter PA in the control storage circuit 31 (step S16).
Of the input character register K corresponding to the value of the character code registers D1 to D5.
Is performed (step S17). That is, 34 input character registers K1 to K34 are provided,
A key code of up to 33 characters including a "space" and a key code of a "line feed" are stored as described above. K1 to K34 correspond to the value of PA every five lines. PA = 0
K1 to K5, K = 1 to K6 to K10, PA = 2, K11 to 15,
K = 16-20 for PA = 3, K21-25 for PA = 4, K2 for PA = 5
When 6 to K30 and PA = 6, K31 to K34 correspond respectively. In the process of step S17, since PA = 0, the key code stored in K = 1 to K5, in this example, the key code of each [character] key of "YESTE" is stored.
30 reads the stored contents of K1 to K5 and outputs 8-bit ASCII
The ASCII code is converted to a character code register D1 with "Y", D2 with "E", D3 with "S", D4 with "T", and D5 with "E".
Remember the I code. If a key code is not stored in K, a "NULL" code and a "new line"
Is converted into two ASCII codes, carriage turn “CR” and line feed “LF”.

Next, as a process of step S18, the control circuit 30
5 and control each circuit to enter a fast-forward high-speed playback state in which the tape is transported at a high speed of 100 times in the forward direction. In this state, the subcode recorded in the subcode recording area from the frame decomposition circuit 24 is sent to the subcode processing circuit 19. The subcode processing circuit 19 stores the subcode ID data in the subcode ID storage circuit 29, and stores the subcode data with parity for each item, for example, the program time of the item "0001" and the item "00".
The tape absolute time of "10" and the character data of item "1000" are stored in the subcode data storage circuit 28 separately. The control circuit 30 gives an instruction to the subcode processing circuit 19 to detect and output the pack data as the search code of the item “1000” and the “S” flag of “1” (step S19). The subcode processing circuit 19 receives this instruction and, if there is pack data as the corresponding search code stored in the subcode data storage circuit 28,
Output for 30. The control circuit 30 receives the character codes of PC3 to PC7 (8 bits in ASCII code) in the pack data and sequentially latches them in the latch circuit 37 shown in FIG. The control circuit 30 controls the control storage circuit 31 in synchronization with the timing of latching the codes of PC3 to PC7, respectively.
The search input character codes stored in the character code registers D1 to D5 are read out and sequentially latched by the latch circuit 38. Assuming that the search code is a search code of a song to be searched, PC3 to PC3 sequentially latched by the latch circuit 37
The code of C7 is D1 to D5 sequentially latched by the latch circuit 38.
Is the same as the input character code. The coincidence detection circuit 39 detects coincidence of both latch data and outputs a “1” signal at each latch timing. This match detection circuit 39
Is input to the shift register 40 and the shift clock Ψ
Are sequentially shifted. In this case, PC3 ~ PC7 and D1
When .about.D5 is equal to each other, "1" is stored in all bits of the shift register 40 when the codes of PC7 and D5 are latched. Since the outputs of all the bits of the shift register 40 are applied to the AND circuit 41, the output of the AND circuit 41 becomes "1" at this point.
This series of operations is the process of step S21 in FIG. 14,
When the output "1" of the AND circuit 41 is detected (step
S22) This means that the tune in which the same character data as the input five characters are recorded as the search code can be searched. Until the search code is detected in step S19 and the match between the search code and D1 to D5 is detected in step S22, the above steps S18 to S18 are performed until the end of the tape (step S20). S22
Are repeatedly executed to search for songs in which the same search code as the first five characters input for search is recorded. Then, in step S22, the search code and D1 to D
When a match of 5 is detected, the control circuit 30 then proceeds to step S23
To detect the beginning of the S-ID of the music in which the search code is recorded. That is, the control circuit 30 causes the quadruple speed rewind reproduction to be performed, and during this time, the subcode processing circuit 19
Give ID detection instruction. This S-ID changes from "1" to "0"
Is the beginning of the song. The control circuit 30 detects the time point of the change, temporarily stops the tape, and proceeds to the next text code comparison process. First, the control circuit 30 determines whether or not the code of “CR” and “LF” indicating “line feed” or the code of “CR” is stored in the character code registers D1 to D5 in the control storage circuit 31. At the time of the post-recording operation described above and at the time of the search operation just described, the key code of the [line feed] key is converted into two ASCII codes of “CR” and “LF”. `` C
The fact that "R" and "LF" or "CR" are stored means that the match detection has already been performed for all the character data. In this case, the match between “YESTE” recorded as the search code and the first five characters “YESTE” of the input character for search is detected, and the ASCII code corresponding to “line feed” is not detected. Then, the process of the next step S25 is performed. In this step S25, "+1" is performed on the pack address counter PA. Control circuit
30 is the next step S26, in which it is determined whether or not PA has become "7". As the text code, Fig. 13 (b)
As shown in (h), seven pack data with the pack address "0" to "6" are recorded, and the fact that the PA is "7" at the stage of step S26 means that
This means that the matching has already been detected for all the character data of up to 33 characters. In this case, PA
Since = 1, the process of the next step S27 is performed.

The process of step S27 is a process of reading the content of the input character register K corresponding to the value of PA, converting the content into the ASCII code, and setting the same in the character code registers D1 to D5, as in the case of step S17 described above. The control circuit 30 executes this process. In this case, since PA = 1, the corresponding values are K6 to K10, which are stored in these K6 to K10. Are converted to ASCII codes and stored in D1 to D5, respectively.
Next, the control circuit 30 puts the tape into a normal constant speed reproduction state (step S28), and reproduces the subcode processing circuit 1 during this time.
9, the text code corresponding to the value of the pack address counter PA ("1"), that is, the item is "1000" and the "S" flag is "0"
Then, an instruction for detecting and outputting the pack data having the address "ADR" of "0001" is given to the subcode processing circuit 19 (step S29). The subcode processing circuit 19 receives this instruction and, when there is a text code corresponding to PA = 1 in the data sequentially stored in the subcode data storage circuit 28, sends this to the control circuit 30. Output. The control circuit 30 controls the PC in the pack data of the text code.
The character codes of 3 to PC7 are compared with the input character codes for search stored in D1 to D5 (step S3
0). The processing in step S30 is performed in step S21 described above.
When a match for all five characters is detected, a match detection signal is output from the AND circuit 41 shown in FIG. 3, and the control circuit 30 outputs PA =
Assuming that a match between the text codes D1 to D5 corresponding to 1 has been detected (step S31), the process returns to step S24, and the processes of steps S24 to S31 are repeatedly executed.

In this example, PA = 1 PA = 2 Comparison of “MORE (CR)” with PA = 3
This is performed by repeatedly executing each process of 31. Here, the song currently being played should be searched Is a song recorded at the beginning of the character code, after the matching detection of "MORE (CR)" of PA = 3 is determined in steps S30 and S31, the character code registers D1 to D5 are stored in the character code registers D1 to D5. "MORE (CR)" is stored. The control circuit 30 detects the “line feed” code “CR” in D1 to D5 in step S24, and proceeds to the process in step S33. The process of step S33 is to determine whether the value of the pack address counter PA is “0”. PA = 0 at the stage of step S33 is a case where character data of four characters or less is recorded and searched, and in this case, a match of the search code is detected at step S22, and at the next step S23 Since the beginning of the music has been found, the cueing process in step S34 is not performed. But,
In this example, since the reproduction has already been performed up to the recording position of the text code of PA = 3, the beginning of the S-ID is located at step S34. Next, the control circuit 30 controls the mechanism section 35 and each circuit to play back from the beginning of the song. In this reproduction, sound is emitted from the speaker 27, and control is performed so that sound is not emitted from the speaker 27 during reproduction during the search operation (steps S18 and S28).

The song played in step S35 is a song in which the same character as "YESTERDAY ONCE MORE (line feed)" input for search is recorded.
The process is continued until the end of the tape is detected in step S36, and when the end of the tape is reached, the tape is stopped in step S37 and the search operation ends. Note that step S1 described above
If the end of the tape is detected in step S20 during the search operation of 8 to S31, it means that there is no tune in which the same character as the input character is recorded. Is stopped and the search operation ends.

As described above, not only the search code but also the text code is subjected to the matching detection with the input character, so that the search operation becomes more reliable. In addition, if the search operation shown in FIG. 14 and the search operation using only the conventional search code are selectively used by keys,
Various search purposes can be handled. In that case, it can be realized by performing the processing of steps S35 to S37 after the processing of step S23 shown in FIG. The text code coincidence detection is performed from PA = 1, but since the text code of PA = 0 is the same as the search code, the coincidence detection is omitted. Further, the number of characters to be recorded is not limited to that of the present embodiment. For example, a maximum of 28 characters may be used to record six pack data. In this case, the text code is multiplex-recorded for 30 frames, each of which is continuous for 5 frames, and the search code is multiplex-recorded, for each of 270 frames.

〔The invention's effect〕

As described in detail above, according to the present invention, first, a search code is read by high-speed reproduction, a comparison is made with a predetermined character at the beginning of an input character, and then a text code of a song for which a match is detected is read by constant-speed reproduction. Since the comparison with the input character is performed, a search can be performed for all of the pre-recorded character data. It is possible to select a desired song.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a partial configuration of a storage area of a control storage circuit, and FIG. 3 is a search operation provided as a part of the control circuit. FIG. 4 is a diagram showing recording tracks on a magnetic tape in this embodiment, FIG. 5 is a diagram showing the format of one track in FIG. 4, and FIG. 6 is a sub-track in FIG. FIG. 7 shows a format of one block of a subcode recorded in a code recording area, FIG. 7 shows a format of a subcode ID in the subcode block, and FIG. 8 shows a control ID of the subcode ID in the subcode ID. FIG. 9 shows the format of the pack data recorded in the subcode data of FIG. 6, and FIG. 10 shows the contents of the pack data corresponding to the items of the pack data of FIG. A FIG. 11 is a pack format when an item is set to a character mode, FIG. 12 is a flowchart showing an outline of control processing of a control circuit in a post-recording mode, and FIG. 13 is a character code as a text code and a search code. FIG. 14 is a diagram showing a tape recording state and pack data when pack data is recorded. FIG. 14 is a flowchart for explaining a search operation. 11 ... 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 section

Claims (1)

(57) [Claims] An identical pack data consisting of character data of n characters is continuously recorded as a search code for a predetermined frame, and a plurality of pack data consisting of character data of m characters (m ≧ n) are recorded. In a digital audio tape recorder that reproduces a magnetic tape having a subcode recording area recorded plural times continuously as a text code and a PCM audio recording area in which an audio signal is recorded, the number of input characters is recorded as the search code. Means for comparing the search code read by the high-speed reproduction with the input character and reproducing the music whose match is detected when the number of characters is the same as the number n of characters. The search code read by high-speed playback and the first n sentences of the input characters Digital audio tape recorder, characterized match comparison with performing, by comprising a means for reproducing the coincidence detected song performed coincidence comparison of the input character text code read by the constant-speed reproduction with.