JPH01312794A - Character data display device for digital audio tape recorder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention relates to a character data display device for a digital audio chip recorder that plays back a magnetic tape on which character data is recorded in a subcode recording area. [Prior art and its problems] The rotating head type DAT (digital audio tape recorder) K, which has been under development in recent years, has an area for recording subcodes in addition to an area for recording PCM audio signals. It is provided. Various information such as the elapsed time of each episode, the absolute time from the beginning of the tape, and the song number are defined as this subcode. In addition, characters such as song titles (
It has been considered to record character data and search (music selection) using this character data. That is, the first predetermined characters of the input characters, for example, five characters, are set as the search code, and the input characters including the first five characters (for example, up to 33 characters) are set as the text code. Then, the same search code is continuously recorded over, for example, 265 frames at the beginning of each eK, and a text code is recorded multiple times over, for example, 35 frames before or after that. However, the above search code is 2
Since the same or multiple tracks are recorded over 65 frames, it is possible to reliably play back any track even when playing at high speeds such as 100 times speed, and during this high speed playback, it is possible to compare and match the input characters. This makes it possible to easily select songs. Also, during constant speed playback, which is the normal playback speed, the above text code is read,
It becomes possible to display characters such as song titles. In this way, it is possible to know the name of the song currently being played by recording it in the character data subcode recording area and displaying it during playback of a famous song. Each time, it was necessary to perform the complicated work of reproducing the entire magnetic tape and displaying the character data. [Object of the Invention] The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a character data display device for a digital audio tape recorder that allows character data over the entire magnetic tape to be easily grasped. . [Summary of the Invention] The present invention stores the character data recorded in the subcode recording area during playback, and reads out and displays the stored character data by an arbitrary operation, so that the character data recorded on the entire magnetic tape can be stored. This makes it possible to understand the character data. [Example] <Configuration of Example> Fig. 1 is a block diagram showing the internal components of the DAT of the present invention.
-DAT) is shown as an example. In FIG. 1, reference numeral 11 denotes a rotating drum provided with two rotating heads 13a and 13b for recording and reproducing data on and from a magnetic tape 12. It is wrapped diagonally over an angle of . Further, 14 is an input terminal to which an audio signal to be recorded is applied, and 15 is an input terminal A that samples the audio signal applied from the input terminal 14 at a sampling frequency of, for example, 48 KHz and converts it into a 16-bit digital value. /D converter. 16 is a signal processing circuit that once writes an audio signal converted into a digital value into a PCM audio data storage circuit 17 without performing interleaving processing, adds an error prevention code, compresses the time axis, and outputs it for entertainment. , 18 is a PCM output from the signal processing circuit 16
This is a frame synthesis circuit that synthesizes the audio signal and the subcode outputted from the subcode processing circuit 19 at the timing of each recording area and outputs the synthesized signal. 20 is a modulation circuit that modulates the recording signal output from the frame synthesis circuit 18 through magnetic recording, and 21 is a recording amplifier that amplifies the modified signal and supplies it to the rotary heads 13a and 13b. Further, 22 is a Niu amplifier that amplifies the playback signal read by the rotary heads 13a and 13b, 23 is a demodulation circuit that demodulates the playback signal amplified by the playback amplifier 22, and 24 is a PCM audio recording area for the demodulated playback signal. This is a frame decomposition circuit that decomposes data into subcode recording area data and outputs the data. The PCM audio signal output from the frame decomposition circuit 24 is sent to the signal processing circuit 16, once written into the PCM audio data storage circuit 17, and subjected to error correction processing, followed by deinterleaving processing and time axis processing. The D
The /Af converter 25 restores the PCM audio signal to an analog audio signal, and this analog audio signal is amplified by the amplifier 26 and then emitted by the 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 it to the frame synthesis circuit 18. At the same time, during playback, the subcodes in the playback signal output from the frame decomposition circuit 24 are stored in the storage circuits 28 and 29.1. It outputs necessary data to the control circuit 30. This control circuit 30 is in charge of controlling the entire system, and exchanges data with the control memory circuit 31a and the list memory circuit 31b, and also sends display data to the display vci3 via the display drive circuit 32.
3 to perform various displays. This display cover 33
It has a data display section 33a for displaying programming data, a character display section 33b for displaying input characters and reproduced character data, and a list display section 33c to be described later. Further, 34 is a control circuit 3 which detects a silent period detection signal for getting accustomed to a silent period in a recording signal during recording.
0, a silent period detection circuit 35 is controlled under the control of the control circuit 30, and includes a rock structure including each ridge mechanism thread such as a drum motor and a capstan motor; 36 a [play] key;
[Stop] key, [Record] key, [Pause key, [Space key], [Character] key, [Line feed] key, [Cursor] key, [Fast forward] key, [Backward] key, [Initial search key] , [List memory] key, [List display]
This is a key manual unit having various keys including a key, a cassette number key, and an after-recording mode designation switch. FIG. 2(A) is a table showing some of the registers and counters set in the control memory circuit 31a. That is, the control memory circuit 31a is provided with a 10-bit 7-frame counter F used during the dubbing operation, a 3-bit back address counter PA, a 3-bit number counter N, and a character code register used during the initial search operation. D]~D5 are each 8 bits, and the input character register is set as 1~34 or 5 bits each, and the character number counter CNO used during the initial search operation is 5 bits and is set to ``1'' during the initial search. A 1-bit initial up IN is provided, and other registers such as a display register and a calculation register are also provided. FIG. 2(B) is a diagram showing the storage area of the list storage circuit 31b, in which catalog numbers (CAT-No) and absolute songs reproduced from the subcode recording area of the magnetic tape 12 during the list storage operation described later. The number (PNO) and character data (CHA) are stored in association with each other. Further, FIG. 3 shows a search circuit provided within the control circuit 30. As shown in FIG. In the same figure, 37 and 38 are 8-bit launches, 39 is a coincidence detection circuit that detects coincidence between the data of the latches 37 and 38, and 40 is an OR circuit to which the output of the AND circuit 41 and the output of the coincidence detection circuit 39 are applied. , 42
is a shift register having a capacity of 5 bits, and 43 is an AND circuit for determining the contents of each bit of the shift register 42. No. 41J indicates the track state recorded on the magnetic tape 12. On the magnetic tape 12, there are two recording tracks with a predetermined inclination angle (approximately 6-!) as shown in the figure. The rotating heads 13a and 13b alternately and sequentially record data. As shown in FIG. 5, this recording track has a PCM audio recording area of 128 blocks in the center, and subcode recording areas (SUB-1, 5UB-2) of 8 blocks each at both ends. . In the PCM audio recording area, data obtained by converting the audio signal to PCM (pulse code change! 14) and adding an error correction code is recorded, and in the subcode recording area, as shown in FIG. Wl (8 bits) consisting of the subcode ID, W2 (8 bits) consisting of the subcode ID and block address, parity for Wl and W2 (8 bits), and subcode data (256 bits) for one block. Eight subcode blocks are recorded for each subcode block. The above subcode ID (8 bits), block address and subcode ID (8 bits) are configured as shown in FIG. 7, with two blocks as one unit. That is, in the subcode ID of an even numbered block, the upper 4 bits are used as the control ID, and the lower 4 bits are used as the data ID.
The subcode ID of the odd numbered block is the upper 4 bits or P
NO・II] 21, lower 4 bits or PNO-ID (31
used as. In addition, the block address and subcode ID portions are defined as the most significant bit or @IT'', with the upper 3 bits of even numbered blocks being the format ID, the lower 4 bits being the block address, and the upper 3 bits of odd numbered blocks being the format ID. Side 3 bits are PNO-I D+11
, the lower 4 bits are used as a block address. Also, of the 4 bits of the control ID above, 3 from the lower
As shown in Figure 8, the start ID, 5-ID, is provided as a cue control signal for the first bit, and 11" Also, the above PNO・ID (11 to PNO・I
D (31 records the absolute track record (001 to 799) of the famous song.O Subcode data in this subcode block (256
(bit) consists of 4 bank data of 64 bits per pack as shown in Figure 9, and 1 byte of 88 bits as shown in the figure.
Among the bits PCI to PC8, the upper four bits of the PCI are assigned as items for identifying the data contents of the pack data, and the PCB is assigned as the parity of the data from PCI to PO7. The above item (4 bits) is shown in No. 101\1. <rooooJ has no information. roooIJ is the recording time of each program (song). roO]OJ is the absolute recording time from the beginning of the tape, r
o 110J indicates the catalog number, and in this example, r
l O00J shall be assigned to character data. The back format when the pack data is character data is as shown in FIG. In other words, the upper 4 bits of PCI are item rl 00
0J, the next 4th bit is specified as ``1'' when used as a character data search code, and as 10'' when used as a text code.
” flag, the lower 3 bits are rsORTJ indicating the content of the character data (for example, song title, hospitality, etc.), and PO2 is 1” when the MSB is recorded as a search code and text code in the same frame. The rWJ flag becomes 00 when only one of the search code and text code is recorded in the code, and the next 5th to 7th bits or ASC as character data.
Code format & indication of II code, JIS code, etc. frFJ MTJ, rA indicating the address of the lower 4 bits # pack
DRJ, PC3 to PC7 are character data of 5 characters with 1 character each byte, and PCB is the PCI above.
~This is the parity for PC7. Further, when the pack data is catalog number data, the pax and t-mat are set as shown in FIG. 12. In other words, the top 4 bits of PCI are item l
0IIOJ, lower 4 bits of PCI and PC2 to PC7
The upper and lower parts of the digits are divided into 4 bits each and designated as N1 to N13, and numeric data is allocated to 13 digits with 4 bits per digit, and the PCB serves as parity for the above-mentioned PCI to PC7. In this embodiment, among the digits of NZ-N13, the upper three digits N1 to N3 are used to indicate that the tape cassette c/) identification number (cassette number) currently being recorded can be recorded by the user. It has become. Therefore, four such pack data are allocated in a subcode block, and one track has 64 packs, l
128 punctures are recorded in a frame (2 trunks) (of which 16 punctures are error correction codes). <Operation of the embodiment> Next, the operation of the above embodiment will be explained. Normally, the dubbing mode switch is turned off.

[By operating the "record" key, the fPd signal applied from the input terminal 14 is converted into PCM and recorded on the magnetic tape 12.
It is recorded in the CMfP recording area. In this case, the silent period detection circuit 34 detects a silent period in the recorded signal, and outputs a silent period detection signal to the control circuit 30 when a silent period of -42 dB or less below the full scale level is detected for 4 seconds or more. The 匍j@circuit 30 determines that the falling edge of this detection signal is the beginning of the song, and sends it to the subcode processing circuit 19.
1ilJ # Send signal. Subcode processing circuit 19
is a 5-ID for cueing in the subcode ID storage circuit 29.
(from the start), store the song number PNO while updating it, and also store the item roo0.
Each time data of 1J to ro010J is stored in the subcode data storage circuit 28 as data in the above-mentioned pack format under the control of the control circuit 30. Also, before operating the [Record] key, set the number from "0" to "9".
The cassette number entered using the [Character] key and the [Cassette number key, for example, the item ro mentioned above by rooIJ] is created by the subcode processing circuit 19 as the catalog number of 10J, and the subcode is It is stored in the storage circuit 28 for use. Then, by outputting -a to the data from each storage circuit 28 and 29 at the timing of the subcode recording area to generate subcode block data and providing it to the frame synthesis circuit 18, the data is stored on the magnetic tape 12 as shown in FIG. The PCM audio signal is recorded in the PCM audio recording area and the subcode is recorded in the subcode recording area in the indicated track format. Also, by operating the "playback" key, the data recorded on the magnetic tape 12 is transferred to the rotary heads 13a and 13.
b, and the audio signal is restored to the original analog signal and emitted from the speaker 27. Furthermore, the subcode recorded in the subcode recording area is stored in the frame decomposition circuit 2.
4 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 provides it to the control circuit 30. For example, data on the program time of item rooolJ is provided to the display device 33 via the display drive circuit 32, and the program time is displayed on the data display section 33a. Character dubbing operation> Next, the case where character data is recorded as a subcode will be described. The character data is recorded in the post-recording mode which is set by turning on the post-recording mode switch, and in this embodiment, character data of a maximum of 33 characters are recorded. In this case, the first five characters of the input character data for the predetermined number of characters are automatically set as the search code for cueing.
Further, the entire input characters including the first five characters are set as a text code for display, and are controlled so that they are recorded only in the subcode recording area in a recording format suitable for each character. First, it is assumed that music for a plurality of sides is recorded in the PCM audio recording area of the magnetic tape 12 in the above-described recording format. The subcode recording area contains the absolute tape time (ABT) of item r0010j from the beginning of the tape to the end of the tape, or the program time (PR) of item roooIJ from the beginning to the end of each episode.
T) is recorded, and the start ID (S-ID), song number PNO, and catalog number of item ro 110J are recorded in the first 300 frames of each episode. Normally, all the information in the subcode recording area is managed by the control circuit 30 in the playback state, and before inputting characters, the user needs to determine the beginning position of the song where characters such as the song title should be recorded, or the location of the song. Cue the previous tape position. Then, in order to input characters, the dubbing mode switch is turned on and the [character] key is operated. Up to 33 characters can be entered including spaces, consisting of the alphabets rAJ to rZJ and numbers "0" to "9".
Input using the [Character] key and the [Space key], which is used to set the space between characters. If there is a mistake in character input, use the cursor key to specify the character to be edited and input a new character. In addition to the title of the song, the characters to be input may include, for example, the name of the singer, or the first 33 characters of a poem. When you have finished entering the characters, press the [line feed] key. The control circuit 30 inputs the operation signals of each key operated for character input, and sequentially stores the corresponding key codes 1 to 34 in the input character register of the control storage circuit 31a. Next, when the [Play] key is operated, the control circuit 30 executes the control shown in the flowchart of FIG. 5-ID whether it is inside or not
The determination is made based on whether or not it is detected as "1" (step S1 in FIG. 13). This determination operation is performed when a 5-ID is detected by the subcode processing circuit 19 and stored in the subcode ID storage circuit 31 while the user is playing back the tape 12 in a normal playback state prior to inputting characters. This is carried out by the control circuit 30 continuously checking. Therefore, the control circuit 30 determines whether 5-ID or 0''
If it is determined that the current tape position is before the beginning of the song where characters are to be recorded, the mechanism unit 35 is controlled to
- Fast-forward the magnetic Qi-Two 12 to the recording start end of the ID and stop (Step 82). In addition, when the 5-ID is determined to be 1', the mechanism section 35 assumes that the current tape position is within the first 815,300 frames of the song in which characters are to be recorded.
is controlled to rewind the magnetic tape 12 to the recording start end of 5-ID and stop (step S3). Next, the control circuit 30 reads out the key codes of the input character keys stored in 1 to 34 of the control memory circuit 31a, and reads the character pack data as shown in FIGS. 14(b) to 14(i). (step 84). For example, the song title is rYESTERDAY, =ONCE, =MOR
Enter the character string EJ (1 represents a space),
It is assumed that the [line feed] key is input at the end. The key code of the operated key is stored in the control storage circuit 31a (7) Kl~. The control circuit 30 sends K1-5 to the processing circuit 19. That is, the t[llj control circuit 30 uses rl 000J as an item to indicate the character mode, r, the SJ flag is "0" indicating the text code, 5ORT is roooJ indicating the general code, and the "W" flag indicates only the text code. 0'', rFMTJ indicates ASCII code
oOOJ, address rADRJ is rooOJ, 8
Outputs one byte of bits. Next, the first five characters of the key code are sequentially output from 5 to the control memory circuit 3]a, K]~, and each character is converted into an 8-bit ASCII code and output. Outputs 1 byte of parity for the 7 bytes of data that have already been output. A subcode processing circuit 9 stores data sequentially input one byte at a time in the subcode storage circuit 28 as one pack data. Koriyo 5
After that, the entered string is separated into every 5 characters and converted to ASCII code, and the following items are displayed: "SJ flag," 5ORTJ, rWJ7 lag, rFMTJ and ]
It is sent to the subcode processing circuit] 9 together with each data of the address rADRJ updated for each pack, and is sent to the 13i-th (
b) to (h) are stored in the subcode data writing t11 circuit 28 as pack data of seven text codes indicated by K. The key codes for the [line feed] key are two A's: carriage return (CR) and 2 infeed (LF).
It is converted to SCII code, and if the input characters are less than 33 characters as in this example, the remaining characters are rN.
The ULLJ code (φ) is stored as shown in FIGS. 14(f) to (h). After the control circuit 30 finishes controlling the generation of pack data as the seven text codes described above, it next generates pack data as a search code. Only the first five characters of the input string are used for the search code. The control circuit 30 has the item "1000J" indicating the character mode, the rsJ flag indicating the search code rlJ, and rsORTJ indicating the general code ro 0.
The 0J and rWJ flags are "0" indicating only the search code,
rFMTJ indicates ASCII code ro OOJ,
Address rADRJ is 8 bits 1 as ro OOOJ
The data is output to the byte-byte subcode processing circuit 19. Next, store the first 5 characters of the key code in the control memory circuit 3]a
ASCII with 8 bits per character, which continues from 1 to 5.
It is converted into an I code and output, and a 1-byte variation is output for the 7-byte data that has already been output. The subcode processing circuit J9 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. 14(i). When the generation of the puncture data is completed by pressing the button in this manner, the correction control circuit 30 inputs the number counter N, frame counter F, and back address counter P in the wholesale storage circuit 31a.
A is initialized (step S5), and then pack data recording Nl control is executed. The subcode data storage circuit 28 includes the subcode data storage circuit 28 shown in FIG. 14(b).
First to seventh pack data as text codes shown in ~(h) and pack data as a search code shown in FIG. 14(i) are stored. The control circuit 30 is
5-The magnetic tape 12 with the start end of the ID positioned at the beginning is fixed at the rated speed, and the mechanism unit 35 is controlled to rotate the rotary drum 11, so that only the subcode recording area is in the recording state, and the other areas are in the recording state. is controlled so that it is in the playback state. Then, the first pack data (first pack data) as a text code corresponding to the puncture address counter PA=0 is
4 (b)) is read out from the subcode data storage circuit 28. The subcode processing circuit 19 sends the first pack data to the frame synthesis circuit 18 at the timing of the subcode recording area, and the first pack data is recorded over the subcode recording area K1 frame on the magnetic tape 12 (the first pack data is Figure 13 step 86). The control circuit 30 increments the number counter N by "+1" (step S7) and increases the frame counter F by r+IJL (step Ss) until the number counter N reaches "5" (step 89).
The recording operation for one frame of the first pack data is continued (steps 85 to 89). When the first pack data is recorded for 5 frames, step S9 to step 5IOK
and set the back address counter PA to r+IJL,,
As the number counter N=O (step 811), PA
The second pack data (FIG. 14(C)) as a text code corresponding to =1 is stored in the subcode data storage circuit 2.
8 and records one frame of second pack data (step 86). By repeatedly executing the processing from Steps 86 to S9, the second pack data is recorded over five frames, and furthermore, the processing from Stella 7'89 to S11 is determined to be PA=7 in Step S12. Execute repeatedly until By repeating the processing of steps 86 to 812 until PA=7, the first to seventh pack data as text codes are recorded for 5 frames each on the magnetic tape 12, for a total of 35 frames. One frame is recorded as shown in FIG. 14(a). If it is determined in step 812 that PA=7, the control circuit 3
0 & control of recording the pack data as search code. That is, the subcode data recording circuit 28 records the puncture data as a search code (FIG. 14(i)).
One after another. The subcode processing circuit 19 sends this pack data to the frame synthesis circuit 18 at the timing of the subcode recording area, and the pack data as a search code is recorded in the subcode recording area K] frames on the magnetic tape 12 (step 513). The control circuit 30 sets the frame counter F to r+IJt (step 514), and continues recording one frame of the pack data as the search code in step 813 until it is determined as F:300 in step S15. This step 813~S1s
By repeatedly executing the process shown in FIG. 14 (i
) pack data as a search code will be recorded over a total of 265 frames from 367 frames to 3007 frames 1. Through the above steps 81 to 815, the first to seventh packs as text codes are stored in frames 1 to 35 in the subcode recording area at the beginning of the 120 songs on the magnetic tape, as shown in FIG. 14(a). Five frames of data are recorded, and pack data as the same search code is repeatedly recorded in frames 36 to 300. In addition, when recording in the above-mentioned subcode recording area, the item rlo00J shown in FIG. 14(b)
~ Item r000 with the pack data shown in (i)
The program time of 1J or the beginning of the song is recorded while being updated from rOJ, the tape absolute time of item ro O10J is recorded as time data that continues from the end of the previous song, and the catalog number of item ro 110J is updated from the beginning of the song. It is recorded over 300 frames, and the song number PNO is recorded in the subcode ID without being updated, and 5-ID is recorded as "1" over 3007 frames from the beginning of the song. When the control circuit 30 finishes dubbing the subcode recording area for the first 300 frames of the song,
Shift to play state. From then on, when dubbing the next song, the same operation as above is performed. <Character Display Operation> Next, a description will be given of an operation in which characters are displayed in a row using a magnetic tape on which character data is recorded as shown in FIG. 14(a) through the above-mentioned post-recording operation. Characters are displayed during normal constant speed playback and during high speed playback such as 100x speed. Among the pack data as character data of item rxooo-1 stored in the subcode data storage circuit 28 by the subcode processing circuit 19 during constant speed or high speed playback, the "S" flag is set to "0" during constant speed playback.
text code, "S" flag or "1" during high-speed playback
The control circuit 30 reads the codes of characters PC3 to PC7 in the search code ", stores them sequentially in the display register of the control storage circuit 31a as display data, and further reads out this display data and sends them through the display drive circuit 32. By sending the data to the display device M33, the character is displayed on the character display section 33b. Here, the "S" flag in item rl 000J is "0".
The pack data "" is character data of a text code, and as shown in FIG. It has optical redundancy. In addition, the bank data (search code character data) with the rsJ flag set to "1" in item rlo00J is fast because the search code pack data is multiplexed over 265 frames as shown in Figure 14(a). It has sufficient redundancy to be able to reproduce without error during reproduction.In other words, during high-speed reproduction, the diagonal recording trunk as shown in FIG.
b will be scanned across multiple lines. The multiplex recording of search codes over 265 frames ensures that even if the head scans during Kusunoki speed playback, the data of any track will be recorded in the number of frames that can be reliably played back. . Initial search operation> Next, using the above-mentioned dubbing operation, as shown in FIG. 14(a), using the magnetic tape on which character data has been recorded, songs in which the first five characters or the same character are recorded are searched one after another. The initial search operation when selecting and reproducing a file will be explained. As shown in Figure 14(a), there are 35 frames of text codes of up to 33 characters including "space" over the first 300 frames of the popular song, and a search code that is the same as the first 5 characters of the text code. or 265
It is assumed that frames are recorded. The user inputs search characters according to the character of the song he or she wishes to select from among the plurality of songs recorded on the magnetic tape. Every time the [character] key is operated, 1tlJi'1l1
The 1 circuit 30 stores key codes corresponding to 1 to 5 in the input character register of the control storage circuit 31a. When [Initial Search Operation-] is operated after inputting this character, the control circuit 30 executes the control operation shown in the flowchart of FIG. First, the control circuit 30 reads each bit of the character number counter CNO in the control memory circuit 31a. Control is performed according to the contents stored in the input character register from 1 to 5. That is, each bit of CNO corresponding to 1 to 5 when data is stored is set to rOJ, and each bit of CNO corresponding to 1 to 5 when data is not stored is set to "1" ( FIG. 15, step 516). K1～
5 corresponds to each bin of the 5-bit CNO). For example, if you manually input the keys for 5 characters, K1~5 will contain all the data, and the CNO will be roooo
OJ, the three characters will be set as Suminaka Chubashira ro 0011J. Next, the control circuit 30 reads the memory contents of 1 to 5 to the input character register in the 1st value memory circuit 31a, and inputs the ASC
The process of converting it into a II code and setting it in the character code registers D] to D5 (step 517) is executed. Next, as processing in step 818, the control circuit 30
5 and each circuit to create a fast-forward high-speed playback state in which the tape is moved forward at 100 times the speed. In this state, the subcode recorded in the subcode recording area is sent from the frame decomposition circuit 24 to the subcode processing circuit 19. The subcode processing circuit 19 is a subcode I
D data is stored in the subcode ID storage circuit 29, and the subcode data with matching parity is stored for each item, for example, the program time of item ro001J, the tape absolute time of item roO10J, and the character of item 1000J. The control circuit 30 sends the subcode data storage circuit 28 to the subcode data storage circuit 28.The control circuit 30 sends the subcode processing circuit 19 a search code in which the item r1oooJ and the rS J flag is "1". A command for detecting and outputting packed data is given (step 819). Upon receiving this command, the subcode processing circuit 19, if there is pack data as a corresponding search code stored in the subcode data storage circuit 28, transfers it to the control circuit 3o.
Output for. The control circuit 30 receives the character codes of PC3 to PC7 (8 bits in ASCII code) in this pack data, and causes the latch circuit 37 shown in FIG. 3 to latch them sequentially. The control circuit 3o reads out the input character codes for search stored in the character code registers D1-D5 in the control storage circuit 31a in synchronization with the timing of latching the codes of PC3-PC7, respectively, and latches them. The circuit 38 is then launched. In addition, the control circuit 3
0 is rINJ, which is the stock “1” at the time of initial search
7 lag is read out and given to the AND circuit 41. The other input terminal of the cono-AND circuit 41 is applied one bit at a time from the higher order of the character number counter CNO in synchronization with the latch timing. In this case, since the initial search is in progress, the rINJ flag is set to "1", and therefore the gate of the AND circuit 41 is in an open state. Also, the character number counter CNO is 1 from the higher order.
The bits are read out in synchronization with the launch timing and applied to the other input terminal of the AND circuit 41, and the match detection circuit 39
The output of is applied to the shift register 42 via the OR circuit 40. The output of the coincidence detection circuit 39 is input to the shift register 42 via the OR circuit 40, and is sequentially shifted by the shift clock V.<0PC3 to PC7 and D1 to D
If the numbers are equal to each other, all bits of the shift register 42 will have "1" written at the time the codes PC7 and D5 are latched. Since the output of all bits of the shift register 42 is applied to the AND circuit 43, the output of the AND circuit 43 becomes "1" at this point. This slow operation is the process of step S20 in FIG. 15, and the output of the AND circuit 43 is "1".
If it is detected (step 821), it means that it has been possible to search for a song in which the same character data as the first five characters inputted is recorded as a search code. Here, "0" is stored in D1 to D5 according to the number of characters input, and "l" is stored in other cases, so even if the number of input characters is less than 5, the input characters of less than 5 characters are When a song recorded as matching character data or a search code is played back at high speed, the output of the OR circuit 40 becomes "1" and "1" is stored in all bits of the shift register 42. This makes it possible to search with less than 5 characters. Note that if you operate the initial search key while entering characters, it will be invalid and the first
The control operation shown in the flowchart of FIG. 5 is not executed. In addition, until the search code is detected in step 319, and in step S2r, the search code and D1 to D5 are
Until a match is detected, the steps 818 to S21 described above are performed until the end of the tape is reached (step 522).
It repeatedly executes each process to search for a song that has a search code with the same initial letter as the one input for the search (0, and then enters the search code and D1 to D in step S21 above).
When a set of 5 is detected, the control circuit 30 then selects the 5 of the song in which the search code is recorded in step S23.
- Detect the beginning of the ID. That is, the control circuit 30 has 4
Double-speed rewind playback is performed, and during this time a 5-ID detection command is given to the subcode processing circuit 19. The point in time when this 5-ID changes from "1" to "0" is the beginning of the song. The control circuit 30 detects this time of change, temporarily stops the tape, and then controls the mechanical section 35 and each circuit in step S24 to start playing from the beginning of the song. Note that during this reproduction, the speaker 27 is made to emit sound, and the speaker 27 is controlled so as not to emit sound during the reproduction during the above-described search operation (steps 818 and 523). The control circuit 30 controls the subcode processing circuit 19 during this reproduction.
5-It) is given a detection command for 5-ID.
The time point at which the value changes from "0" to "1" is determined 6 (step 525). The time point at which this 5-ID changes is when the first track has finished playing and the head has started to be positioned at the next second track, and the control circuit 30 detects this and steps 8 above.
Returning to step 18, the subsequent processes are performed. If the beginning of the 5-ID of the next song is not detected in step 825 during playback of the selected song (step 524), playback continues until the end of tape P is reached in step 826, and the end of the tape is reached. Stop the tape at that point (step 5)
27), the search operation ends. Similarly, during search operation (
If the end of the tape is reached in steps 818 and 519), the process moves to step 328 and the tape is stopped. During this initial search operation, the control circuit 30 sends both the reproduced character data sent from the sub-code processing circuit 19 and the character code entered manually for the search to the display device 33 via the display drive circuit 32. The character currently being reproduced at high speed and the search target character are displayed simultaneously on the character display 11iB 33b. <List storage/display operation> Next, list storage operation and list display operation will be explained. The list storage/display operation of this embodiment involves reading the catalog number, song number, and characters recorded on the tape over the entire tape and storing it in the memory, and the user reading out the stored information as necessary. Is it possible to understand the existence of tape recordings? It was made easy. As shown in Figure 14(a), the magnetic tape contains 35 frames of text code of up to 33 characters over 300 frames of the beginning of a famous song, and the first 5 frames of the text code.
It is assumed that 256 frames of characters and four-character search codes are recorded, and the star ID (S-ID) is set. In order for the user to know the contents recorded on the tape, K operates the list memory key while setting the tape. The control circuit 30 receives this key operation signal and executes the control operation shown in the flowchart of FIG. That is, as the process of step S29, a control signal is given to the mechanism m35 to rewind the magnetic tape to the starting end. Next step S
As the process 30, the control circuit 30 controls the mechanism section 35 and each circuit to enter a fast-forward high-speed playback state in which the tape is transported in the forward direction at a speed 100 times faster. In this state, the frame is disassembled! ! 24, the subcode recorded in the subcode recording area 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 also stores the subcode data with matching parity for each item, for example, the catalog number of item ro 110, and the catalog number of item rlo00J. The data is divided into character data and stored in the subcode data storage circuit 28. The control circuit 30 informs the subcode processing circuit 19 that the "S" flag is "1" in item rl OOOJ.
A command for detecting and outputting pack data as a search code is given (step 531). Upon receiving this command, the subcode processing circuit 19 outputs bank data stored in the subcode data storage circuit 28 as the corresponding search code to the control circuit 30, if any. When the control circuit 30 inputs the pack data as a search code, the control circuit 30 inputs the character codes of PC3 to PC7 (8 bits each, total 40 bits) in the puncture data to the strike memory circuit 1M31b in FIG.
In addition, the subcode data storage circuit 28
From the catalog number data of item r0110J, the N1 to N30 cent numbers and the song number PNO are output from the subcode ID storage circuit 29, and are stored in the list storage circuit 31b in association with the character code (step 532). ). This step 831 and 832
This process is continued until the end of the tape is detected in step S33, and when the end of the tape is detected, the process proceeds to step S34.
to stop the tape and end the operation. By this slow operation, the list storage circuit 31b stores the cassette number, song number, and character recorded on the tape in association with each other. In this state, the contents stored in the list storage circuit 31b can be displayed by operating the list display key. That is, when the list display key is operated, the control circuit 30 determines whether or not a key operation for specifying display selection has been performed prior to this key operation (step 53).
5). Key operations for specifying this display selection include "0" to
There is a cassette number specification by operating the "9" [letter] key and the [cassette number key] and a character specification by operating only the [letter] key, and the control circuit 30 lists only the data specified by the key operation. memory circuit 31b
from the display device 113 via the display drive circuit 32.
3 and displayed on the list display section 33C (step 836). Furthermore, if there is no key operation for specifying display selection, all the memory contents of the list memory circuit 31b are read out,
A list is displayed as shown in FIG. 18 (step 537). In this way, data such as characters recorded on the tape is stored in the list storage circuit 31 using the list storage key.
The recorded contents of the tape can be easily grasped because the contents are stored in the tape and the contents are arbitrarily displayed using the list display key. Note that time data such as program time may be stored in the list storage circuit 31b, and the list display section 33c
The display may be scrolled depending on the level of activity. [Effects of the Invention] As detailed above, according to the present invention, even if a cassette label or the like is created, character data covering the entire magnetic tape can be easily grasped by a simple key operation, which improves operability when selecting music. You can measure your improvement.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 (
A) is a diagram showing a partial configuration of the storage area of the control storage circuit, FIG. 2(B) is a diagram showing the configuration of the storage area of the list storage circuit, and FIG. 4 is a block diagram of a circuit that performs a search operation, FIG. 4 is a diagram showing the recording tracks on the magnetic tape in this embodiment, FIG. 5 is a diagram showing the format of one track in FIG. 4, and FIG. Figure 5 shows the format of one block of subcode recorded in the subcode recording area, Figure 7 shows the format of the subcode ID in the same subcode block, Figure 8 shows the format of the subcode ID in the same subcode ID. FIG. 9 is a diagram showing the format of pack data recorded in the subcode data of FIG. 6. Figure 10 is an item table showing the contents of the pack data according to the item of the pack data in Figure 9, Figure 11 is the back format when the item is set to character mode, Figure 12 is the item set to catalog number mode. Figure 13 is a flowchart showing an outline of the control processing of the control circuit in dubbing mode, and Figure 14 shows the tape recording state and pack when recording bank data of characters as text codes and search codes. FIG. 15 is a flowchart for explaining the initial search operation; FIG. 16 is a flowchart for explaining the list storage operation; FIG. 17 is a flowchart for explaining the list display operation. The 18th prisoner is a diagram showing a list display state. 11... Rotating drum, 12... Magnetic tape, 13a
. 13b...Rotating head, 18...Frame synthesis circuit, 19...Sub code processing circuit, 24...Frame decomposition circuit, 30...Control circuit, 31b...List storage circuit, 33... ...Display device, 36...Key human power department. Patent applicant: Casio Computer Co., Ltd. Figure 2 (A) Figure 2 CB) ID (Suzu-) ID) Fig. 8 MSB LSB knob 7 Kufuo Matsu Fig. 9 Key Fukuda t-S Fig. 11 Starognanno de mo 1 Fig. 12 Fig. 16 Fig. 18

Claims (1)

[Claims] (1) In a digital audio tape recorder that plays back a magnetic tape that has a subcode recording area in which pack data consisting of character data is continuously recorded for a predetermined frame and a PCM audio recording area in which audio signals are recorded. A character data display device for a digital audio tape recorder, comprising: a storage means for storing reproduced character data; and a display control means for reading out and displaying the character data stored in the storage means by an arbitrary operation.