JP2625694B2 - Digital audio tape recorder - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a digital audio tape recorder for recording / reproducing 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. 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.

[Object of the Invention] In the present invention, in the above-described DAT, character (character) data can be recorded as a subcode, and the character data is simply used for display or cueing data. It is an object of the present invention to provide a DAT capable of controlling the recording state according to the usage.

[Summary of the Invention] The present invention provides a method for multiplexing and recording a series of data a plurality of times when character data is used for display, and a high-speed search for the same character data when using the data for cueing. In such a case, the recording is controlled so as to continuously record only frames that can be reproduced at times.

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,
A signal processing circuit for compressing and reading and outputting the time axis after adding an error correction code, and a recording area 18 for a PCM audio signal output from the signal processing circuit 16 and a subcode output from the subcode processing circuit 19 A frame synthesizing circuit for synthesizing and outputting at the timing shown in FIG. Reference numeral 20 denotes a modulation circuit that performs modulation suitable for magnetic recording on a recording signal output from the frame synthesizing circuit 18, and 21 amplifies the modulated signal and rotates the rotary head 13 a
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, [search code] ] Key, a [text code] key, a [song selection] key, and various keys including a post-recording mode designation switch and the like.

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.
(Pulse code conversion) and data to which an error correction code is added are recorded. In the subcode recording area, as shown in FIG. 4, W1 (8 bits) composed of a sync code (8 bits) and a subcode ID , 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 data in this subcode block (256
5) is composed of four pack data of 64 bits per pack as shown in FIG. 5, 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 items (4 bits), as shown in FIG. 6, "0000" has no information, "0001" has a recording time of each program (song), "0010" has an absolute recording time from the beginning of the tape, and "0011". Indicates the tape running time from the start of recording. 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 the lower 3 bits are “SORT” (eg, song title, song poem, etc.) indicating the content of the character data, and PC2 is “1” when the MSB records the search code and text code in the same frame. The "W" flag which 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 J code.
“FMT” indicates a code format such as an IS code, and the lower 4 bits are “ADR” indicating an address of the pack. PC3 to PC7 are character data for a total of five characters, one character for each byte. ~ Parity for 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, 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 24, 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 (start ID) in the sub-code ID storage circuit 29, and controls the control circuit 30 to store each time data of the items “0001” to “0011”. Thus, the data is stored in the sub-code data storage circuit 28 as the data in the above-described pack format. Then, the data is read out from each of the storage circuits 28 and 29 at the timing of the subcode recording area, and the data of the subcode block is generated and supplied to the frame synthesizing circuit 18, so that the data shown in FIG. In the track format, the PCM audio signal is recorded in the PCM audio recording area, and the subcode is recorded in the subcode recording area.

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 sub-code processing circuit 19 sequentially stores the sub-code data in the input reproduced sub-code in the sub-code data storage circuit 28, reads out the necessary sub-code data of the item, and gives it to the control circuit 30. Is the item "00
The program time data of "01" is supplied 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. Character data is recorded after the dubbing mode switch is turned on.
In this embodiment, the song title is recorded as a search code, and the song song is recorded as a text code. In this case, it is possible to search for any song from the magnetic tape 12 by the song title, and the song song song is mainly Control is performed so that recording is performed in a recording form suitable for each display.

First, when recording the title of each song as a search code, after the dubbing mode switch is turned on, the start position of the song for which the title is to be recorded is located by operating the [play] key or the like. Then, a character of up to five characters is input as the title of the tune that has been searched for using the [character] key. The control circuit 30 receives the operation signal of the "character" key, converts each character signal into a corresponding code format, for example, an ASCII code, and sends it to the subcode processing circuit 19. The subcode processing circuit 19 The obtained character codes are sequentially stored in the subcode data storage circuit 28. Then, a search code is designated by operating a [search code] key, and a [record] key is operated by operating a [record] key.
Is recorded in the sub-code recording area. That is, when the song name “SONGA” is key-input, for example, in response to the control of the control circuit 30, the sub-code processing circuit 19 stores the sub-code data in the pack format as shown in FIG. Is generated and stored. Here, the item is “1000” indicating the character mode, the “S” flag is “1” indicating the search code, “SORT” is “000” indicating the song title, the “W” flag is “0” indicating only the search code, "FMT" is "000" indicating an ASCII code, and the address "ADR" is "000", and character codes "S", "O",
“N”, “G”, and “A” are stored, and PC1 to PC8
The parity for PC7 is stored. When the [Record] key is operated in the after-recording mode, the control circuit 30
With the above control, the recording data in the PCM audio recording area is reproduced in the track of the magnetic tape 12, and only the data in the subcode recording area is recorded. Thus, the sub-code processing circuit 19 sends the pack data shown in FIG. 8B to the frame synthesizing circuit 18 at the timing of the sub-code recording area. In this case, the control circuit 30 executes the control operation shown in the flowchart of FIG. 10, and the search code sub-packages the pack data shown in FIG. 8 (b) by the processing of steps S1, S2, and S3 in FIG. Recording is made in the code recording area, and this recording is continued until 300 frames are detected in step S4. Then, when the same pack data (FIG. 8 (b)) is recorded for 300 frames, the recording is terminated and stopped in step S5. By this series of controls, the same character "SO" is recorded in the subcode recording area in the track of the magnetic tape 12 as shown in FIG.
"NGA" is recorded at the beginning of the desired song for 300 frames. Thereafter, the start position of the desired song is searched, and 5
Enter the song name within characters using the [character] key and operate the [search code] key and the [record] key.
The pack data shown in FIGS. 8 (c) and 8 (d) is recorded in the first 300 frames of each music piece as shown in FIG. 8 (a).

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 title of the music to be searched for is input using the [character] key, and the [music selection] key is operated. The input music title is stored in the control storage circuit 31 under the control of the control circuit 30. Further, the control circuit 30 controls the mechanism section 35 to transfer the magnetic tape 12 at a speed of 200 times.
The data is reproduced by 3 and 14. The sub-code processing circuit 19 inputs the data of the sub-code recording area in the reproduction signal, and when the pack data as the search code with the item "1000" and the "S" flag of "1" is input, the pack data 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 character data stored in the control storage circuit 31, and when the matching reproduction character data is transmitted, the magnetic tape 12
Is stopped, thereby making it possible to search for a desired music title.

Next, a case where a song verse is recorded as a subcode will be described. First, the PCM audio is reproduced by operating the [play] key with the post-recording mode switch turned on. Then, the song is stopped at the part where the song is to be recorded, and the [record] key and the [pause] key are simultaneously operated to enter the rec pause state. Then, a desired character is input by operating the [character] key. In this case, the user operates the [SPACE] key to add a word delimiter, and operates the [RETURN] key when the input of one line of verse is completed. When the [text code] key is operated and the [pause] key is operated again, the rec pause state is released, and the input character data is recorded as a text code. That is, the control circuit 30 has a [character] key, a [space] key,
Upon receiving the operation signal of the [line feed] key, the signal is converted into a corresponding ASCII code and transmitted to the subcode processing circuit 19. The subcode processing circuit 19 sequentially stores the sent character codes in the subcode data storage circuit 28. In this case, since the [TEXT CODE] key is operated, the character code is divided into every five characters in the subcode data storage circuit 28, and for example, as shown in FIGS. The pack data for each piece is stored. Here, the item is “1000” indicating the character mode, the “S” flag is “0” indicating the text code, the SORT is “001” indicating the song poem,
"FMT" is "000" indicating the ASCTII code, and the address is incremented from "0000" in pack data of every five characters. In the example of FIG. 9, since the pack data is 15 packs of three characters and is "0000" ~ "0010". Also, PC3 ~ PC7
As shown in FIGS. 9 (b) to 9 (d), a code for five characters including a space code and a line feed code is stored as a song poem, and a parity for PC1 to PC7 is stored as PC8. The recording in the after-recording mode is a recording of only the subcode recording area as described above, and a portion including the other PCM audio recording area is in a reproduction state. The sub-code processing circuit 19 sends the pack data shown in FIGS. 9B to 9D to the frame synthesizing circuit 18 at the timing of the sub-code recording area. In this case, the control circuit 30
The control operation shown in the flowchart of FIG. 10 is executed. In the text code, the pack data shown in FIGS. 9 (b), (c), and (d) is recorded on one track by the processing of steps S1 → S6 of FIG. The same pack data is assigned to the
The process is continued until completion of double writing is detected in S7. As a result, when each pack data is recorded twice as shown in FIG. 9A, the process proceeds to the process of recording the subcode data as "0" in step S8. During this time
The data in the PCM voice recording area is being reproduced, and when the part where the song / verse is to be recorded is reproduced next, the [Pause] key is operated and the same key operation as described above is performed. ) To (g) are recorded in double writing as shown in FIG. 9 (a).

In this way, when the magnetic tape 12 on which the verse data as a text code is recorded is reproduced in the post-recording mode off, the verse can be displayed. That is, when the [Replay] key is operated after rewinding the magnetic tape 12, the PCM sound is reproduced and emitted from the speaker 27, and the reproduced data in the subcode recording area is subjected to the subcode processing through the frame decomposition circuit 24. The signal is input to the circuit 19. The subcode processing circuit 19 determines whether the item in the input reproduction subcode is "S"
The flag is determined, the item is “1000” indicating the character mode, and the “S” flag is “0” indicating the text code.
Are sequentially read and stored in the sub-code data storage circuit 28, and the character codes of PC3 to PC7 of the parity-packed data are sequentially read out, and the control circuit 30
To send to. The control circuit 30 converts the transmitted character code into display data, and converts the character code into display data via the display drive circuit 32.
Is displayed on the display device 33, the song poem corresponding to the music currently being reproduced is displayed. The subcode processing circuit 19 continues this operation until a line feed code appears in the pack data PC3 to PC7, and while the pack data is "0", the character code stored in the subcode data storage circuit 28 up to the previous time is stored. Is output to the control circuit 30. In this way, the input song can be displayed when the magnetic tape 12 is reproduced.

[Effects of the Invention] As described in detail above, according to the present invention, character (character) data can be recorded as a subcode,
When this character data is used merely for display, a series of data is multiplexed and written a plurality of times to provide redundancy, so that the data can be read reliably during reproduction, and the character data is used as search data. In this case, it is possible to control so that the same data is recorded, for example, continuously for 300 frames, as long as the rotary head can surely read the data at the time of a high-speed search such as a 200 × speed search.

[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.
FIG. 6 is a diagram showing the format of pack data recorded in the subcode data of FIG. 4, FIG. 6 is an item table showing the contents of the pack data according to the items of the pack data of FIG. 5, and FIG. FIG. 8 is a diagram showing a tape recording state and pack data when a character is recorded as a search code, and FIG. 9 is a tape recording when a character is recorded as a text code. FIG. 10 is a flowchart showing states and pack data, and FIG. 10 is a flowchart showing an outline of control processing of the control circuit in the after-recording mode. 11 ... rotating drum, 12 ... magnetic tape, 13, 14 ... rotating head, 18 ... frame synthesis circuit, 19 ... subcode processing circuit, 24 ... frame disassembly circuit, 30 ... control circuit, 33
...... Display device, 36 ... Key input unit.

Claims (4)

(57) [Claims] The present invention relates to a method of recording data on a magnetic tape in a frame unit in which one track composed of a PCM audio recording area and a subcode recording area is paired with two tracks, and pack data in the subcode recording area. In a digital audio tape recorder that records as a subcode and records the pack data in a form including an item for identifying the data content of the pack data and an address indicating the order of the pack data, an input for sequentially inputting characters Means for generating and outputting character data corresponding to each input character; and generating means for generating pack data from character data sequentially supplied from the input means, wherein Generate character data for a predetermined number of characters as data in the pack data ,
Generating means for generating the item as a code indicating a character mode and generating pack data using the address as a code having the same value; and recording the pack data of the same content generated by the generating means on the magnetic tape over a plurality of frames. And a first recording control means. 2. A method for recording data on a magnetic tape in a frame unit comprising two tracks each comprising a PCM audio recording area and a subcode recording area, and storing pack data in the subcode recording area. In a digital audio tape recorder that records as a subcode and records the pack data in a form including an item for identifying the data content of the pack data and an address indicating the order of the pack data, an input for sequentially inputting characters Means for generating and outputting character data corresponding to each input character; and generating means for generating pack data from character data sequentially supplied from the input means, wherein The data which is a set of character data for every predetermined number of characters is And sequentially generates the item as a code indicating a character mode, and generates a code of a value corresponding to an order in which the character data for each of the predetermined number of characters is set as a set as the address, and And a second recording control means for recording the pack data generated by the generating means on the magnetic tape over a plurality of frames in the order of the addresses. Audio tape recorder. 3. Data is recorded on a magnetic tape in a frame unit in which one track composed of a PCM audio recording area and a subcode recording area is a set of two tracks, and pack data is stored in the subcode recording area. In a digital audio tape recorder that records as a subcode and records the pack data in a form including an item for identifying the data content of the pack data and an address indicating the order of the pack data, an input for sequentially inputting characters Means for generating and outputting character data corresponding to each input character; and generating means for generating pack data from character data sequentially supplied from the input means, wherein Generate character data for a predetermined number of characters as data in the pack data ,
Generating means for generating the item as a code indicating a character mode and generating pack data using the address as a code having the same value; and recording the pack data of the same content generated by the generating means on the magnetic tape over a plurality of frames. First recording control means for performing the following operations: reproducing means for transferring the magnetic tape to reproduce recorded data; character data in pack data reproduced by the reproducing means; A digital audio tape recorder, comprising: comparison means for comparing character data corresponding to a character; and transfer control means for controlling a transfer state of the magnetic tape according to a comparison result of the comparison means. 4. A method of recording data on a magnetic tape in a frame unit in which one track composed of a PCM audio recording area and a subcode recording area is paired with two tracks, and storing pack data in the subcode recording area. In a digital audio tape recorder that records as a subcode and records the pack data in a form including an item for identifying the data content of the pack data and an address indicating the order of the pack data, an input for sequentially inputting characters Means for generating and outputting character data corresponding to each input character; and generating means for generating pack data from character data sequentially supplied from the input means, wherein The data which is a set of character data for every predetermined number of characters is And sequentially generates the item as a code indicating a character mode, and generates a code of a value corresponding to an order in which the character data for each of the predetermined number of characters is set as a set as the address, and Generating means for generating pack data respectively; second recording control means for recording the pack data generated by the generating means on the magnetic tape over a plurality of frames in the order of the addresses; and transferring and recording the magnetic tape. A digital audio system comprising: a reproducing unit for reproducing data; and a display control unit for inputting character data in pack data reproduced by the reproducing unit and displaying a character corresponding to the character data. Tape recorder.