JPH08212763A - Recording and reproducing apparatus - Google Patents

Abstract

PURPOSE: To obtain a recording and reproducing apparatus by which a program number can be renumbered even without an RF signal when the program number is to be renumbered on the basis of program start signals recorded in subcode regions which are formed before and after a PCM region on a track. CONSTITUTION: In a renumbering mode, whether an RF signal exists or not is detected via an envelope detection circuit 38. Then, when the absence of the RF signal is detected, a tape 14 for a recording and reproducing apparatus is driven to be in a forward state via a system controller 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus suitable for use in a rotary head type digital audio tape recorder or the like, and particularly to renumbering a program number on a recording medium. The present invention relates to a recording / reproducing device.

[0002]

2. Description of the Related Art As a conventional rotary head type recording / reproducing apparatus, for example, a rotary head type digital audio tape recorder is known. When recording an audio signal or other information with this digital audio tape recorder, a PCM audio signal is recorded and subcode data including position information such as a program number and time code and other necessary auxiliary data. Is a PC
It is recorded in an area different from the area in which the M audio signal is recorded.

The position of the tape can be known at the time of reproduction based on the subcode data, and the tape can be cueed in the search mode.

Since such subcode data includes data that changes with time, in the most general form, one program is stored continuously and over the entire area.

For example, if the program is music, 1
With a song as one program, a time code, a program number, etc. are recorded over the entire area from the beginning to the end of one song. In that case, when multiple programs are recorded on the same tape once, the program numbers such as "1", "2", "3" ... Are automatically recorded in each program according to the recording order. Is made in.

By the way, when a general user records with a tape recorder, it is rare that one raw tape records a plurality of programs from the tape top to the tape end at one time. Usually, for example, one program is used to record several programs, and then several other programs are connected to the previous program at a later time, such as a splice record, or another program is superimposed on the previously recorded program. In many cases, the program is recorded repeatedly.

Therefore, when n programs are recorded in the first recording and the program numbers "1" to "n" are added, and then m programs are recorded in the second recording,
Program numbers of "1" to "m" are added to the m programs.

Therefore, the same 1 to n and 1 can be applied to one tape.
Since a plurality of program numbers up to m will be recorded, the serial number and unity required for the program numbers will be lost at all, which makes it impossible to locate the tape.

In order to solve this problem, it is conceivable to reset the program number (renumber) after the recording of one tape is completed. However, as described above, the program number is recorded over the entire program. Therefore, it is necessary to reset the numbers by taking the same time as the recording time of all programs.

For example, in the case of a tape in which the entire program is recorded for 180 minutes, it is necessary to re-enter the program number for 180 minutes while running the tape at the same speed as at the time of recording. Further, since the program number is recorded in the area of the subcode data, it is very difficult to control the timing of re-typing.

Therefore, the present applicant previously filed Japanese Patent Application No. 59-27.
In No. 2545, the following recording method was proposed.
That is, the subcode is recorded only at the beginning of the program, and at the time of the first recording, the program number is sequentially recorded at a predetermined position of the subcode area of each program and the second and subsequent recordings. In this case, the program start signal is recorded at the predetermined position in place of the program number for the time required for detection so that the program start signal can be detected even at high speed when searching, for example, for 10 seconds. I have to.

When the program number is recorded on the tape on which all the programs have been recorded, the program start signal is sequentially detected, and the part is followed by the program number recorded at the time of the first recording. The program numbers are recorded in sequence.

[0013]

As described above, when the program start signal in place of the program number is detected and the program number is re-alternated (renumbered) without an RF signal, these cannot be read. There was a problem that it became impossible to continue.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a recording / reproducing apparatus in which the renumbering operation is not interrupted even if a signal is not recorded on the recording medium during the renumbering operation. .

[0015]

A recording / reproducing apparatus of the present invention is a recording for re-allocating a program number corresponding to a program recorded on a recording medium having at least a PCM area and a subcode area on a track. In the reproducing apparatus, reproducing means for reproducing the data recorded in the PCM area and the subcode area on the recording medium, and detection for detecting a program start signal from the data recorded in the subcode area reproduced by the reproducing means. Means, a searching means for searching the start position of the program based on the detected program start signal, a storage means for storing the address in the PCM area having the start position information of the post-search program, and the presence / absence of a reproduction signal. The discriminating means discriminates that there is no reproduction signal at the program start position. When, in which a composed and control means for controlling the retrieving means to forward search reproducing apparatus.

According to the above-mentioned recording / reproducing apparatus, the envelope detection circuit 3 as the discriminating means for detecting the presence or absence of the reproduced signal.
By immediately performing a forward search on the basis of the detection output of 8, the program number that can be re-alternated can be obtained.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the recording / reproducing apparatus of the present invention will be described in detail below with reference to FIGS. FIG. 1 shows the circuit configuration of the present embodiment. In FIG.
The analog signal from the input terminal 1 is supplied to the analog-to-digital converter 3 through the low-pass filter 2, where it is converted from an analog signal to a digital signal and then to the recording signal generation circuit 5 via the contact a side of the switch circuit 4. Supplied. It is also possible to directly supply a digital signal from the terminal 6 to the recording signal generating circuit 5 by switching the switch circuit 4 to the contact b side.

In the recording signal generating circuit 5, signal processing such as addition of error correction code of data, interleaving or modulation is performed based on the timing signal from the timing generating circuit 7, and then the switching circuit 8 is operated. Supply.

The switch circuit 8 includes a rotary magnetic head 11
It is for switching between A and 11B, and the head 1 is driven by a switching signal from the timing signal generating circuit 7.
Half rotation period including the tape contact period of 1A and head 11B
And a half rotation period including the tape contact period.

In this timing generating circuit, a rotary head 11A, which is obtained in synchronism with the rotation of a rotary driving motor for the rotary heads 11A, 11B from a pulse generator (not shown),
A pulse of 30 Hz indicating the rotation phase of 11B is supplied.

The signals from the switch circuit 8 switched by the switching signal from the timing generation circuit 7 are amplified by the amplifiers 9A and 9B, and then the switch circuits 10 respectively.
The rotary heads 11A, 11 via the contact R side of A, 10B
It is supplied to B and recorded on the magnetic tape 14 wound between the reels 12 and 13.

The switch circuits 10A and 10B are connected to the contact R side during recording and switched to the contact P side during reproduction.

Reference numerals 15A and 15B are amplifiers to which reproduction outputs from the corresponding rotary heads 11A and 11B are supplied when the switching circuits 10A and 10B are switched to the contact P side during reproduction, and these amplifiers 15A and 15B are provided. Each output of is supplied to the switch circuit 16.

The switch circuit 16 receives a switching signal of 30 Hz from the timing signal generating circuit 7 for a half-rotation period including the tape contact period of the head 11A, as in the recording.
The head 11B is alternately switched over in a half-rotation period including a tape contact period.

The output signal switched by the switch circuit 16 is the equalizer 1 which constitutes an electromagnetic conversion system.
7, the comparator 18, and the PLL circuit 19 to supply the error correction circuit 20 with which error correction is performed as necessary.

Further, the digital-analog converter 21 is further provided.
Where the digital signal is converted into an analog signal and then taken out to the output terminal 23 as the original analog signal through the low pass filter 22.

When it is desired to directly take out the digital data, it can be derived from the output terminal 24 of the error correction circuit 20.

Further, a subcode microcomputer 25 serving as an interface is provided on the output side of the error correction circuit 20. Here, a subcode including a program number, a time code, etc. is extracted and a system controller using the microcomputer is provided. 26. The system controller 26 controls the entire system.

The system controller 26 is provided with a plurality of buttons necessary for operation. Here, only the renumber button 27 for re-setting the program number, the fast forward button 28, and the rewind button 29 are typically shown. Indicates.

A drum servo circuit 30 is controlled by the system controller 26. The drum servo circuit 30 rotates a drum motor 31 which rotates a drum 39 to which the rotary heads 11A and 11B are attached.
To control.

A reel drive circuit 32 is provided for the reels 12 and 13, and drive signals from the reel drive circuit 32 are supplied to the reel motors 33 and 34, respectively. The reel drive circuit 32 changes the level of the drive signal applied to the reel motors 33 and 34 according to the mode switching signal from the system controller 26.

Reference numeral 35 denotes a capstan servo circuit controlled by the system controller 26, and the capstan servo circuit 35 controls a capstan motor 37 for rotationally driving the capstan 36.

A pinch roller 40 is provided for the capstan 36, and a plunger circuit for controlling the pinch roller 40 against the elastic force is provided.

Reference numeral 38 denotes an RF envelope detection circuit provided on the output side of the switch circuit 16 for detecting the envelope of the RF signal. The presence or absence of the signal recorded on the magnetic tape 14 is detected and the RF signal is present. For example, the envelope detection output is detected, and the detection output of the envelope detection circuit 38 is supplied to the system controller 26.

Next, the structure of data recorded on the magnetic tape will be described in detail with reference to FIGS.

In the helical scan type digital audio tape recorder having the above-mentioned configuration, when the whole amount of data obliquely recorded on one track is referred to as one segment, and the unit amount of recording data is one block, one segment is divided into one segment. 196 blocks (7500 μsec) of data are included.

Margins (11 blocks) are provided at both ends of one segment corresponding to the end of the track. Subcode 1 and subcode 2 are recorded adjacent to each of the margins. The two subcodes are the same data and are double-recorded. The sub code is a program number and time code. A PLL run-in section (2 blocks) and a post-amble section (1 block) are arranged on both sides of a recording area of 8 blocks of the subcode.

Further, an inter block gap in which data is not recorded is provided, sandwiched by the inter block gap of 3 blocks, and pilot signals for ATF are recorded over 5 blocks. The PCM signal subjected to the recording process is recorded in an area having a length of 128 blocks excluding a PLL run-in section of 2 blocks in an area having a length of 130 blocks at the center of one segment. This PCM signal is data corresponding to the audio signal during the time when the rotary head makes 1/2 rotation.

FIG. 2 shows the data structure of one block of the PCM signal. An 8-bit (1 symbol) block synchronization signal is added to the beginning of one block, and then an 8-bit P
CM-ID is added. A block address is added next to the PCM-ID. The two symbols (W1 and W2) of the PCM-ID and the block address are subjected to error correction coding processing of simple parity, and 8-bit parity is added next to the block address.

As shown in FIG. 3, the block address (W2) is composed of 7 bits excluding the most significant bit (MSB), and the most significant bit is set to "0" so that the block address (W2) is a PCM block. Is shown.

The 7-bit block address is 00 to 7F
(Hexadecimal display) changes sequentially. The PCM-ID (W1) recorded in each block of the lower 3 bits of the block address is 000, 010, 100, 110.

The lower 3 bits of the block address are 00
Each block address of 1,011,101,111 is
An optional code of PCM-ID can be recorded. Each of the PCM-IDs has a 2-bit ID 1 to 1
The ID8 and the 4-bit frame address are included. ID
Identification information is defined for each of 1 to ID7.

A pack is composed of 32 ID8s. For example, ID1 is a format ID, and whether it is for audio or another use is identified by ID1, ID2 identifies on / off of pre-emphasis and characteristics of pre-emphasis, and ID3 identifies a sampling frequency. The above-mentioned ID1 to ID7 and the frame address are the same data in the segment of the interleave pair.

FIGS. 4A and 4B show the data structure of a subcode block, and one block of the subcode block is composed of 288 bits like the PCM data block.

As shown in FIG. 4A, the first 8 bits of one block are a block synchronization signal, the next 8-bit data W ₁ is a subcode ID, and the next 8-bit data W ₂ is a subcode ID. And the address signal of that block,
The next 8 bits are the parity P for error correction generated for the data W ₁ and W ₂ , and the remaining 256 bits (consisting of 32 symbols because 8 bits form 1 symbol) are generated for the subcode data and it. Error correction parity.

More specifically, the 8-bit data W ₁ and W ₂ are as shown in FIG. 4B. That is, the MSB of the data W ₂ is used to identify the block, the subcode block or the PCM data block, and in the case of the subcode block, this becomes “1” as shown in the figure.

The lower 4 bits of the data W ₂ are a block address, and the content of the subcode ID differs depending on whether the LSB is “0” or “1”. When LSB of the block address is "0", data W ₁ consists of 4 bits of the control ID and a 4-bit data ID, the upper 3 bits of the block address of the data W ₂ is the format ID.

[0048] 3 upper bits of the data W ₁ and W ₂ when the LSB of the block address is "1" indicates a block number. In this case, the program number is represented by a 3-digit BCD code, the upper 3 bits PNO-1 of the block address of the data W ₂ is the uppermost digit, and the upper 4 bits PNO-2 of the data W ₁ is the middle digit. The lower 4-bit PNO-3 represents the least significant digit, and the program numbers are represented by 001 to 799. Note that 00
0 indicates that the program number is not recorded, and 0AA indicates that the program number is invalid.

Four sub-code blocks whose block address LSB is “0” and sub-code blocks whose LSB is “1” are alternately recorded in four blocks out of eight blocks in each sub-code area.

The control ID is composed of, for example, a 4-bit (4 types) ID (identification signal), and includes a table-of-contents identification signal (TOC-ID) for representing a table of contents and a skip identification signal (for skipping unnecessary information portions). SKIP-I
D), a program start identification signal (START-ID) for indicating the start of the program (hereinafter simply referred to as a program start signal), and a priority identification signal (PRIORITY-ID) for indicating the priority of information. Is included.

Next, the program number of the subcode presented by the present applicant is recorded only at the beginning of a plurality of programs at the first time, and the above-described program start signal is recorded at the second time and thereafter. The operation of re-alternating (renumbering mode) in which a program start signal is detected and a program number following the first recorded program number is sequentially recorded will be described with reference to FIG.

In FIG. 5, a renumbering mode for re-entering the program start signal of each program is applied to the magnetic tape 14 in which the program start signal is recorded by the second recording in the program number recorded in the first recording. First, the renumber button 27 is pressed to set the program number 0 in a register (not shown) in the system controller 26.

In step (b), the system controller 2
6 controls the reel drive circuit 32 and the like to wind up the tape 14.

Then, in the step (c), the reels 12, 13
The system controller 26 determines from the output from a tape top end detection circuit (not shown) provided adjacent to the tape top end, and waits until the tape top is reached if it is not the tape top. Then, in step (d), the system controller 26
Thus, the reel drive circuit 32 and the like are controlled to forward feed the tape 14 at, for example, 16 times speed to retrieve the program start signal.

In step (e), the subcode microcomputer 25
The system controller 26 determines whether the program start signal is 1 or not, and waits until the program start signal is not 1. If the program start signal is 1, the process proceeds to step (f).

In step (f), it is judged whether or not the program number on the tape 14 and the program number to be written next are equal, and if they are equal, in step (g) the write program number in the register in the system controller 26. Set to +1 and proceed to step (ヰ). If they are not equal, the process proceeds to step (h), in which the system controller 26 controls the reel drive circuit 32 and the like to reverse the tape 14 at the triple speed. Then, in step (i), the system controller 2 is operated via the subcode microcomputer 25.
At 6, the point where the program start signal changes from 1 to 0 is detected. If it is not detected, wait until it can be detected, and if it is detected, proceed to step (n).

After waiting about 0.5 seconds in consideration of the system start-up in step (nu), the reel 14 is fed forward by controlling the reel drive circuit 32 and the like in the system controller 26 in step (ru).

In step (wo), the subcode microcomputer 25
The point where the program start signal changes from 0 to 1 is detected in the system controller 26 via. If it cannot be detected, it waits until it can be detected, and if detected, the frame address at that time is stored in the memory (not shown) in the system controller 26.

While reading the frame address stored in step (f), the system controller 26 controls the reel drive circuit 32 and the like to reverse the tape 14 at 1 × speed.

In step (yo), the subcode microcomputer 25
The point where the program start signal changes from 1 to 0 is detected in the system controller 26 via. If it is not detected, wait until it can be detected, and if it is detected, wait for the system startup time, for example 1.5 seconds, in step (t) and proceed to step (r) to move to the system controller 2
6, the reel drive circuit 32 and the like are controlled to forward feed the tape 14.

In step (SO), the system controller 26 determines whether or not it is several frames before the frame address previously stored in step (WA), for example, two frames, and waits until it is two frames before two frames. If it is before, step 2 will post-record the preamble in two frames.

As the preamble data, for example, a program start signal 0, a priority identification signal 0, a program number OAA, etc. are used. The system controller 26 determines whether or not two frames have been reached in step (ne),
If there are no more than 2 frames, the process waits until two frames are reached, and after two frames, the program start signal 1, the priority identification signal 1, the program number obtained by adding 1 to the previous program number, and the time code are recorded for 300 frames.

The time code is incremented and stored for each frame. The system controller 26 determines whether or not 300 frames have been reached in step (la).
If there are no frames, wait until waiting, and after 300 frames, post-record the postamble for 30 frames in step (m).

The same data as the preamble is used as the postamble data. The system controller 26 determines whether 30 frames have been reached in step (c), waits until 30 frames have passed, and waits 30 frames until the system controller 2 with step (ヰ).
6 controls the reel drive circuit 32 and the like to fast forward (F
F) Enter the search.

In step (No), the system controller 26 determines whether the tape is the end, and if it is the tape end, the process returns in step (e). If not, the program start signal is sent in the system controller 26 in step (K). If it is 1, it returns to step (No), and if it is 1, the system controller 26 controls the reel drive circuit 32 to reverse the tape 14 at 16 × speed in Step (YA), and Returning to (i), the above-described operations such as determining whether or not the program start signal has changed from 1 to 0 in the system controller 26 are repeated.

Also, during the renumbering operation, the frame address is read as described above, for example, from step (h) to step (n), but no signal is recorded (no RF signal). Then, this cannot be read and operation cannot continue. Therefore, in this embodiment, when a no-signal state is entered, the forward operation is immediately started to enable the operation in the no-signal section.

That is, as shown in the flow chart of the RF signal of FIG.
When the RF signal as the envelope detection output supplied from the envelope detection circuit 38 disappears, the system controller 26 determines whether or not the renumber is in progress in step (K). At system controller 26, it is determined whether or not reverse is in progress. If it is during reverse, the forward mode is entered in step (U), the process returns to step (T) shown in FIG. 5, the dubbing mode is entered, and the same operation as described above is repeated.

If the renumbering is not being performed at step (K) or the reverse is not being performed at step (F), the process proceeds to step (D) and returns.

[0069]

According to the recording / reproducing apparatus of the present invention, when the program start signal is detected and the program number is renumbered (renumber mode), the program start signal previously recorded on the recording medium is searched. In the signalless state where there is no RF signal on the recording medium at the stage of the operation, the adverse effect that the signal of this part cannot be read and the operation of the renumbering mode cannot be continued is eliminated, and the program start signal position can be read accurately. As a result, a recording / reproducing apparatus capable of performing the renumbering operation can be obtained.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing an embodiment of a recording / reproducing apparatus of the present invention.

FIG. 2 is a data format of a PCM signal block used in the recording / reproducing apparatus of the present invention.

FIG. 3 is a format of W ₁ and W ₂ of a PCM signal block used in the recording / reproducing apparatus of the present invention.

FIG. 4 is a format of a subcode block used in the recording / reproducing apparatus of the present invention.

FIG. 5 is a flowchart at the time of renumbering of the recording / reproducing apparatus of the present invention.

FIG. 6 is a flowchart of the recording / reproducing apparatus of the present invention when there is no RF signal.

[Explanation of symbols]

 5 recording signal generation circuit 11A, 11B rotary head 12, 13 reel 14 magnetic tape 20 error correction circuit 25 subcode microcomputer 26 system controller 27 renumbering button 30 drum servo circuit 31 drum motor 32 reel drive circuit 33, 34 reel motor 35 Capstan Servo Circuit 37 Capstan Motor 38 Envelope Detection Circuit

Claims (1)

[Claims] 1. A recording / reproducing apparatus for re-allocating a program number corresponding to a program recorded on a recording medium having at least a PCM area and a subcode area on a track, the PCM area on the recording medium, and Reproducing means for reproducing the data recorded in the sub-code area, detecting means for detecting a program start signal from the data recorded in the sub-code area reproduced by the reproducing means, and the detected program start signal Searching means for searching the start position of the program based on the above, and a PC which is the start position information of the program after the search.
It comprises a storage means for storing an address in the M area and a discriminating means for detecting the presence or absence of the reproduced signal, and when the discriminating means discriminates that there is no reproduced signal at the start position of the program, the forward operation is performed. A recording / reproducing apparatus comprising: a control unit that controls the search unit to perform a search.