JPS62188084A - High speed searching device for rotary head type pcm signal reproducing device - Google Patents

Abstract

PURPOSE:To reduce the search time by deciding a comparison program number for searching corresponding to the size of a compared difference between a reproduction program number and an object program number. CONSTITUTION:The object program number set by a keyboard is stored at registers 102 and 104. The content of the register 102 is compared with the reproduction program number stored at a register 101 in a high speed scanning time at a comparator 107, and when a difference value is small, the contact A of a switch 106 is selected. And the reproduction program number from the register 101 is stored as it is at a register 103 as the comparison program number, and by comparing it with the object program number of a register 104, the searching is performed in a rapid response. On the other hand, when the difference value is large, and apart from the object number, a correct program number having no erroneous read decided by the majority of plural program numbers by one time of scanning, etc., through a multiple check circuit 105 is designated as the object of comparison, thereby the search time can be reduced as a whole.

Description

[Detailed description of the invention] The invention will be explained in the following order.

A. Field of industrial application B. Outline of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving the problem F. Effect G. Description of the embodiment of the GIPCM signal recording and reproducing device (Fig. 4) G2 Explanation of high-speed search (Figure 4) Explanation of program number comparison operation in G3 system controller (11) (Figures 1, 2, and 3) The present invention relates to a device for reproducing, for example, an audio signal recorded in PCM using a head, and particularly to a high-speed search device used for finding the beginning of a song.

B. Summary of the Invention This invention provides a device for comparing a program number recorded on each track with a set target program number and finding the track position of the target program number from the comparison difference. When the difference is small, the program number obtained from the playback output at that time is used for comparison with the target program number, and when the comparison difference is large, the value determined from the multiple program numbers obtained by multiple scans of the rotating head is used. This is used for comparison with the target program number, and when the comparison difference is large, it prevents malfunctions due to reading errors, and when the comparison difference is small, it is possible to misjudge and immediately return to the correct search value even if a mistake is made. In this way, the overall search time can be shortened.

C. Conventional technology Digital tape recorders that use a rotating head are known as digital tape recorders that record audio signals as PCM signals on tape (for example, published by Sony Corporation Shibaura Factory on November 11, 1985).
w Vol, 61/1985J, pages 11-17
(see page).

This is called R-DAT, and the tape is wound 90 inches around a small drum with a diameter of about 30 mm, and two rotating heads with different azimuths placed 180 degrees apart are rotated at, for example, 200 rpm. and rotate these two rotating heads alternately over the tape at 90°.
Scan intermittently by the wrap angle.

On the other hand, if the audio signal is sampled at a sampling frequency of 48
ktlz, each sample value is linearly quantized to 16 bits to generate a PCM audio signal, which is time-compressed into a 90" wrap angle every 1/2 rotation time of the rotating head. Diagonal 1 on the tape
Record each book as a track. And when playing,
The PCM signal from the two rotating heads is decoded and expanded to the original time axis, and then restored to an analog audio signal.

In this case, each track contains not only PCM data, but also tracking servo signals during playback, time codes, and subcodes such as program numbers inserted at the beginning of songs, etc., are recorded in a separate area from the PCM data. Ru.

Figure 5 shows the tape format of this R-DAT, in which the PCM audio signal is recorded in which area PCM of slightly less than 60° within each track T within a 90° angle range, and on both sides of this area PCM. 2. Area AT of III
A pilot signal for tracking servo is recorded at F (approximately 2.3 degrees each). Furthermore, subcodes are recorded in two areas 5UB (about 5 degrees each) on both sides outside of the area.

The reason why the pilot signal area ATF and subcode area SUB for tracking servo are provided in two places above and below each track is to prevent dropouts and to pick up as many subcodes as possible during high-speed searches. This is to do so.

Note that a guard area is formed between the areas PCM, ATF, and SUB, and the beginning and end of each track are defined as margin areas.

Among the subcodes, the program number is recorded for a few seconds at the beginning of each side, for example, as follows.

That is, during recording, when recording is started from a stop state or a pause state, a start signal is recorded for, for example, 9 seconds at the beginning. This start signal is also recorded for the first 9 seconds of the next song when a no-signal interval between songs lasts, for example, 2 seconds or more during recording. Furthermore, the song is recorded at an arbitrary position (for example, at a position thought to be the beginning of the song) by the user's button operation during recording. This recording of the start signal by manual operation by the user can also be performed during playback.

In this way, the tape is rewound where the start signal is recorded as part of the subcode in the area SUB at the beginning of the song.
When set to the program number recording mode, the device searches for a start signal from the beginning of the tape and sequentially writes the start signal into a program number. Therefore, when a start signal is recorded at the beginning of each picture, a serial number is written as a program number in the subcode area SUB for each song from the beginning of the tape.

In this case, eight subcode blocks are written in each subcode area SUB, but subcodes with the same content are written in the upper and lower areas of one track.

FIG. 6 shows the format of a subcode block, and one subcode block is composed of 288 bits like a PCM data block.

As shown in the figure, the first 8 bits of the l block are the block synchronization signal 5YNC, the next 8 bits of data W1 are the subcode ID 9, and the next 8 bits of data W2 are the subcode ID and the address signal of that block. , the next 8 bits are parity P for error correction generated for data W1 and Wl, and the remaining 256 bits (8 bits
The symbols (consisting of 32 symbols) are subcode data and error correction parity generated for the subcode data.

The 8-bit data W1 and Wl are as shown in FIG. 6 in more detail.

That is, the MSB of data W2 is used to identify whether the block is a subcode block or a PCM data block, and when it is a subcode block, it becomes "1" as shown in the figure. The bit is a block address, and the contents of the subcode ID differ depending on whether the LSB is "0" or rN. Block address LS
When B is "0", data W1 consists of a 4-bit control ID and a 4-bit data ID;
The upper 3 bits of block address 2 are format I.
It is considered to be D.

The start signal mentioned above is recorded as 1 bit of the control ID, and when this is "1", it is the beginning of the song.

When it is "0", the song is in progress.

When the LSB of the block address is rlJ, the data W
1 and the upper three bits of data W2 indicate the program number. In this case, the program number is represented by a 3-digit BCD code, the upper 3 bits of the block address of data W2 PNO-1 is the most significant digit, the upper 4 bits of data W1) PNO-2 is the middle digit, The lower 4 bits PNO-3 represent the lowest digits, and the program number is represented from (001) to (799). Note that (000) indicates that the program number is not recorded, and (OAA) indicates that the program number is invalid.

Four subcode blocks of which the LSB of the block address is "0" and which are rlJ are alternately recorded out of the eight blocks of each subcode area SUB.

Writing the program number based on the start signal described above means that the program number is written by detecting whether the start signal in the control ID of Wl, which is the subcode ID, is "1" or not.
If it is lJ, block address 1. S B
The program number is written in the subcode block with "1" ((000) is sequentially rewritten for each song).

D. Problems to be Solved by the Invention A high-speed search can be considered in which the above-mentioned program numbers are used to quickly locate the beginning of a song. For example, by increasing the tape speed and controlling the number of rotations of the head drum to keep the relative speed of the head to the tape constant, high-speed playback is performed, and the subcode is extracted from the signal extracted from the rotating head at this time. Detects the playback program number, compares this playback program number with the program number of the target song, calculates the tape running direction and the distance to the target position based on the magnitude relationship and the size of the comparison subcode, and calculates the tape running direction and the distance to the target position. thicker (when the tape is far away, the tape is fed at a high speed of, for example, 200x, and when it is near the target position, the tape speed is increased to 166x, 3x, etc.)
The tape is gradually slowed down to 1x speed, and when the target program number and the playback program number match, the tape is stopped or normal playback is started from there.

As a technique for keeping the relative speed of the rotary head constant during high-speed searching, for example, a reproduced clock frequency obtained as a frequency synchronized with a reproduced signal in a reproduced bit synchronization circuit can be used. That is, the drum rotation speed may be controlled so that the reproduced clock frequency is a predetermined fixed frequency (see Japanese Patent Application No. 59-232077).

In this way, you can perform a high-speed search by comparing the playback program number and the target program number, but if you directly compare the playback program number with the target program number and use the comparison difference as is, the following will occur. produce defects.

That is, the parity P given to the subcode ID and block address of the subcode block is a simple parity generated as follows: P=WtΦW2 (■:MOD2).

Therefore, during high-speed search, the false detection probability is false detection probability = (raw error rate) x -, the total error rate during search is = 0.3, and the false detection probability is 1.
2X 10-3. This means that when performing a high-speed search with the relative speed of the head constant, the drum rotation speed is 3000 r.
In the case of pa+, it is calculated that false detection occurs once per second, and the error rate is relatively high.

From the above, if the playback program number itself is always used as a comparison value for the target program number as described above, false detections will continue to affect it, and it will take a very long time to reach the target position, making it impossible to cue quickly. It turns out.

In other words, if the playback position is far from the target program number position, the search time will be shorter if the 200x speed described above is used, but if the program number is incorrectly detected and the playback position is close to the target position, If this is determined, the tape speed mode will change to low speed and the search will take a long time.

E. Means for Solving the Problem This invention has been made to improve this point, and in this invention, a PCM signal to which a program number that changes for each piece of data that is complete in content is One diagonal track is sequentially formed at each single position along with its program number, and the recorded recording medium is sent at high speed so that the rotary head scans across the plurality of diagonal tracks to perform high-speed playback. In a device for searching the position of a target program number, during the above-mentioned high-speed reproduction, the value of the program number obtained every time the rotary head scans is compared with the value of the target program number, and the comparison iw difference value is When the comparison error value is large, the value determined from the program number obtained by multiple head scans is used, and when the comparison error value is small, the value obtained from the scan at that time is used for comparison with the target program number. The above target program number position is searched from the output.

F Comparison between the effect reproduction program number and the target program number When the error value is large, multiple checks are performed using multiple program numbers obtained by multiple tape scans of the rotary head instead of using the reproduction program number itself. Since this value is used for comparison with the target program number, even if there is an erroneous detection at this time, it has no effect and the tape continues to be fed at high speed.

On the other hand, when the comparison error value becomes small, it is desirable to slow down the tape speed and carefully check the playback program number. Checking multiple program numbers multiple times takes time.

However, in the present invention, when the comparison error value becomes small, the reproduction program number at that time is used for comparison with the target program number, so that a quick response can be taken.

G Description of Embodiment GLPCM Signal Recording and Reproducing Apparatus FIG. 4 is an overall block diagram of an example of a PCM signal recording and reproducing apparatus to which this invention is applied. First, the signal system will be explained. During recording, the input analog audio signal is After being band-limited in the low-pass filter (21), A
/D, is supplied to the D/A converter circuit (22) and converted into a digital signal, which is supplied to the encoder section of the error correction encoder and decoder circuit (23), where it is converted into a PCM signal for each block and subjected to interleaving processing. , parity for error correction, block synchronization signals, block address signals, subcodes, etc. are added.

During this recording, the switch circuits (24) and (28) switch to the recording side REC in synchronization with the switching of the circuit (23) to the encoder.
It is switched by a switching signal from the circuit (23).

Then, from the circuit (23), the audio signal head H
A PCM audio signal obtained by time-compressing the half-time signal of A or HB into a 90° rotation with parity etc. added is obtained in the tape contact section of the rotary heads HA and HB, This is the switch circuit (24)
, a recording amplifier (25), a switch circuit (28) and a head changeover switch circuit (29).
and HB, and are sequentially recorded as one diagonal track on the tape (3).

The head changeover switch circuit (29) is operated by a head changeover signal from the circuit (23) so that the PCM signal compressed in time for 90° rotation is supplied to the head that comes into contact with the tape (3). It is alternately switched to side A and side B every two rotations.

Next, during playback, the switch signal from the circuit (23) switches the wrist inch circuits (24) and (28) to the PB side, and the head changeover switch (29) switches between the rotating heads HA and HB in the same way as during recording. It is alternately switched to the side that comes into contact with the tape (3).

The PCM signal reproduced from the tape (3) by the heads HA and HB is supplied to the reproduction process circuit (27) via the reproduction amplifier (26), where it is subjected to reproduction equalization processing, bit synchronization is performed, and the signal is digitalized. The data is shaped into data, and a reproduced clock is obtained by a PLL circuit.

The PCM data from this reproduction process circuit (27) is supplied to an error correction encoder and decoder circuit (23). During this reproduction, the circuit (23) functions as a decoder, and the PCM signal is decoded after error correction and the like.

The decoded signal is converted into an A/D, D/A converter (22
) is converted back to an analog signal in the D/A converter section, and the audio signal is reproduced through a low-pass filter.

Next, to explain the head drum, tape running control system, etc., (11 indicates a drum, and this drum (11) has two rotating heads HA and HB separated by 180 degrees.
), and is rotated in a fixed direction by a drum motor M1, usually at a rotation speed of 2000 rpm.

(2) is a rotation detecting means of the drum motor (11) from which a frequency signal DFG proportional to the drum rotation number (head rotation speed) and a signal Dpc indicating the head rotation phase are obtained.

(3) is a magnetic tape, which is unwound from the supply reel (4) and is wound diagonally around a 90' angle area of the drum (1), and then transferred to the capstan (6) and the pinch roller (7).
) and is wound onto the take-up reel (5).

The capstan (6) is rotationally driven by a capstan drive motor M2 to feed the tape.

(8) is a rotation detecting means of this motor M2, from which a frequency signal cpa proportional to the rotation speed of the motor M2 can be obtained.

M3 and M→ are reel motors that drive reels (4) and (5), respectively, and the rotation speeds of these motors M3 and M4 are detected by rotation detection means (9) and (10), respectively, and from this, the rotation is detected. Frequency signals Ts and Tt proportional to the number are obtained.

Further, (11) is a system controller (hereinafter abbreviated as system controller), (12) is a capstan and drum servo circuit, (13) is a reel drive control circuit, (1
4) is a calculation device for reel drive control; (1)
5) is a search control circuit, and (16) is a brake means.

In addition, (17) is an input device equipped with various operation buttons, (
18) is a display that displays the tape running direction, recording/playback display, program number, etc.

The signal DFG indicating the rotation speed of the rotating heads HA and HB from the rotation detection circuit (2), the signal Dpc indicating the rotation phase, and the signal cpa indicating the rotation speed of the capstan (6) from the rotation detection circuit (8) are capacitors. Supplied to the stun and drum servo circuit (12). And this servo circuit (
12) receives a signal from the system controller (11) and generates a signal to control the rotational speed and rotational phase of motor M1 during recording and normal playback, and also generates a signal to keep the tape feeding speed constant for motor M2. do.

Explanation of G2 high-speed search High-speed search uses the set target program number,
This is done by comparing the program number of the subcode extracted from the reproduced signal.
The subcode decoded in 3) is the system controller (1
1).

Further, the envelope detection output of the reproduced RF (high frequency) signal from the reproduction amplifier (26) is supplied to the search control circuit (15), and the reproduced clock signal from the reproduction process circuit (27) is supplied to the search control circuit (15). Supplied. Reproduction RF signal t! It is used to check whether or not the PCM signal is recorded on the tape (3).
Subcode outputs provided in 1) are ignored. The reproduced clock signal is used as a reference to keep the frequency constant when performing servo at a constant relative speed of the head, as will be described later.

In the case of this device, during high-speed search, the tape is fed at a maximum speed of 200 to 300 times, and the tape speed is gradually slowed down as the target tape position is reached. (51
The tape is fed by , and the drum rotation speed is varied so that the relative speed is constant. Also, at speeds below 16x, the capstan (6) feeds, and the drum rotation speed is 2000 rpm.
Set to constant with +.

That is, when feeding the tape at 200 to 300 times the speed, a signal from the system controller (11) is supplied to the reel drive control circuit (13) and the arithmetic unit (14)
supplied to On the other hand, the calculated value! (14) includes reel motors M3 and M4 from rotation detection circuits (9) and (10).
Frequency signals T9 and 7 are supplied which are proportional to the rotational speed of the motor. The arithmetic circuit (14) compares the reference value at 200x to 300x speed with the signals 'rs and TT, and based on the comparison output, the reel drive control circuit (13) feeds the tape at a constant tape speed. More reel motors M3 and M.

A drive signal is supplied to

At this time, the capstan (6) and the pinch roller (7) are separated, and the tape is fed at high speed only by the reels (4) and (5).

At this time, the system controller (11) is more important than the servo circuit (12).
Based on the signal from the search control circuit (15) and the signal from the search control circuit (15), the drum rotation speed is controlled so that the reproduced clock frequency is constant, that is, the relative speed of the head is constant.

On the other hand, when feeding the tape at a speed of 16 times or less, the capstan (6) is pressed against the pinch roller (7), and the tape (3) is fed by rotation of the capstan (6). A reference signal for this purpose is supplied from the system controller (11) to the servo circuit (12), where it is compared with the frequency signal CFG, and the comparison output is used to control the tape so that it is constantly fed at a predetermined speed that is 16 times the speed or less. .

Next, a high-speed search method will be explained.

(1) First, a target position is set by setting a program number using an input device.

(2) Compare the target position and the current position to determine the traveling direction.

The current position can be known by, for example, storing the program number at the stopped position.

(3) The tape is run at the highest search speed (200x to 300x) at which data can be read in the determined direction. At this time, since the relative speed of the rotary head is controlled to be constant, the subcode can be extracted from the playback output, and the program number can be decoded from the subcode. However, the audio output is muted.

Based on this decoded program number, the system controller (11) compares it with the program number at the target position to perform a search operation, and the specific method of this comparison will be described later.

(4) If the running direction is forward, play
When the decoded program number matches the desired program number, brake means (
16) to stop the tape. At this time, the stopping position is a position past the target position.

(5) Next, the tape is played in reverse at 166x speed from this stop position. At this time, the drum rotation speed is 20
00 rpm, but since the relative speed does not deviate much from the normal speed, the subcode can be read sufficiently and the program number can be decoded and obtained.

(6) By reverse playback, once the target position has been exceeded, the vehicle is stopped, or without stopping, the vehicle is run in the forward direction at twice the speed while reading the subcode.

(7) After passing the target position, play back at 1x speed in the reverse direction, and when the target position is reached, play in reverse for another 1 second.

(8) After 1 second has elapsed, the device is made to run forward at normal playback speed, and after 1 second has elapsed, muting is canceled and the normal playback state is established.

(4') When the running direction is reverse, the tape is rewound and played back at high speed, finds the point at which the program number at the target position has been played, and stops the tape when it deviates from that point.

(5') Next, the tape is run from the stop position in the 166x forward direction while reading the subcode.

(6') From the point where the tape has passed past the target position, run the tape in the reverse direction at double speed while reading the subcode.

(7') After passing the target position, continue to run on the tape for 1 second (1 second at normal speed) in the reverse direction.

(8') After 1 second has elapsed, the vehicle is made to run at normal playback speed in the forward direction, and when 1 second has elapsed, minting is canceled and the normal playback state is established.

With the above steps, you can search for the desired position and perform normal playback.

Of course, the tape may be stopped at the target position.

Explanation of the program number comparison operation in the G3 system controller (11) The high-speed search described above is performed by comparing the program number of the subcode extracted from the playback signal and the target program number.
This is done in software, but this will be explained below.

FIG. 1 is a functional block diagram of the program number comparison operation within the system controller (11).

The program number TGPNO of the target position set manually by the keys of the input device (17) is in the register (102)
and stored in (104).

On the other hand, the program number R at the current playback position is obtained by decoding the subcode extracted from the playback signal.
The DPNO register (1
01). Loading into this register (lot) may be performed every time a subcode is decoded.

The output of the register (101) is sent to the multiple check circuit (105).
) and is also supplied to one input terminal A of the switch circuit (106).

The multiple check circuit (105) stores the output from the register (101) for multiple scans of the heads HA and HB, checks these multiple program numbers multiple times, determines the correct read data, and outputs it. For example, the following method can be considered as a method of multiple checking.

■ Compare the newly read data from the tape with the previously read data, and if these data are completely equal, output as correct read data. in this case,
If necessary, the data read the time before the previous time or the time before the time before the previous time may also be used.

■ A majority vote is taken from the data read multiple times and output as correct read data.

(2) If n (m>n) 111 or more of the m items read match, the matched data is output as correct read data.

The read program number thus obtained from the multiple check circuit (105) is supplied to the other input terminal B of the switch circuit (106).

Then, the program number RDPNO at the current playback position in the register (101) and the program number TGPNO at the target position in the register (102) are determined by the comparison circuit (107).
), and if the difference between both numbers is 2 or more and the current position is far from the target position, the switch circuit (1
06) is switched to the other input end B side by the output of this comparison circuit (107), and the read program number obtained through multiple checking is taken into the register (103) as the comparison program number 〇MPNO.

In addition, when the comparison circuit (107) compares, when the difference between both numbers is 1 or less and the current position is near the target position, the switch circuit (106) is switched to one side by the output of this comparison circuit (107). The program number RDPNO at the current playback position is switched to the input end A side of the register (10
3).

Comparison program number C of this register (103)
MPNO is compared with the target program number TGPNO of the register (104) in the comparator circuit (10B), and the comparison difference value is supplied to the tape running control means (109), and the comparison result value and the current tape running state are The next state is determined as described in the fast search method above.

FIG. 2 is a flowchart corresponding to the functional block diagram of FIG. 1, and the operation is almost the same as described above, but when the difference between the program number RDPNO at the current playback position and the program number TGPNO at the destination position is 2 or more. In the multiple check, when all the read program numbers up to n times before match, the correct read program number is output, but if all matches cannot be found, the search is stopped.

FIG. 3 shows another example of the program number comparison operation during high-speed search. In this example, multiple checks are performed on the program number obtained from the switch circuit (106) to further prevent malfunctions. This is a case where it is designed to prevent this.

In other words, in this example, the switch circuit (106) performs multiple checks to obtain the program number value when the current location is far from the destination, and when the current location and destination are only ±1 apart. When the positions are close, the currently reproduced program number RDPNO is supplied to the register (110) as the respective read program number RDPNO'.

The read program number RDPNO' from this register (110) is supplied to the multiple check circuit (113) and also to one input terminal A of the switch circuit (114).The multiple check circuit (113) is a multiple check circuit. It has the same configuration as (105), and the program number obtained by multiple checking is supplied to the other input terminal B of the switch circuit (114).

Then, the read program number RDPNO' from the register (110) and the previous comparison program number CMPNO from the register (111) are compared in the comparison circuit (115), and the difference between the two numbers is 2.
In the above case, the switch circuit (11
4) is switched to the input end B side and the number value obtained by multiple checking is taken into the register (111), and when the difference between both numbers is 1 or less, the comparison circuit (11
5"), the switch circuit (114') is switched to the input terminal A side, and the read program number RDPNO' from the register (110) is taken into the register (111) as the comparison program number CMPNO.

Then, the comparison program number CMPNO from this register (111) is compared with the program number TGPNO of the target position written manually by the key from the register (116) in a comparison circuit (117), and the comparison result is used when the tape is running. The signal is supplied to the control circuit (11B), and the next tape running state is determined from this comparison result value and the current tape running state as explained in the above-mentioned high-speed search method.

In the above example, the comparison circuit (107) compares the reproduction program number RDPNO and the comparison program number CM.
The switch circuit (105) is switched depending on whether the difference with PNO is less than 1 or greater than that, but the switch circuit (105) is switched depending on whether the difference between both numbers is less than or greater than 2 or more.
105) may be switched.

Further, the value of n of the n program numbers used in the multiple check may be a fixed value, but may be changed depending on the magnitude of the comparison difference in the comparison circuit (107).

H Effects of the Invention As described above, in this invention, when performing a high-speed search, the tape speed is initially set to about ±200 times (reverse direction when negative), and the tape speed is set to ±16 times based on the relationship between the target position and the current playback position. When changing the mode sequentially from double speed, 2x upper speed, 1x upper speed, and normal playback, the value obtained by performing sufficient multiple checks at the point where the mode does not change, such as when the target position is far from the current playback position. Since RDPNO is used as a comparison value for the destination program number, it is possible to prevent malfunctions due to errors in reading the program number RDPNO at the current playback position. Further, at a mode switching point where the target position is near the current playback position, multiple checks are not performed, and the program number RDPNO at the current playback position is used as a comparison value with the target program number, so mode switching can be quickly handled.

Also, when the target position and the current playback position are close,
When the system misjudges and enters the wrong mode,
When the target position and the current playback position are separated and the multiple checked program number is compared with the target program number, the mode can be easily switched to the correct mode.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram of an example of the main part of this invention, and FIG.
The figure is a flowchart corresponding to the example in Figure 1, Figure 3 is a functional block diagram of another example of the main part of this invention, Figure 4 is an overall block diagram of an example of the device of this invention, and Figure 5 is a rotating head. FIG. 6 is a diagram showing an example of the tape format used in the PCM audio signal recording/reproducing apparatus. FIG. 6 is a diagram showing an example of the format of the subcode recorded in the subcode area of the recording track. (101) is a register for the program number at the current playback position, (102) and (104) are registers for the program number at the target position, (103) is a register for the comparison program number, (105) is a multiple check circuit,
(107) and (10B) are comparison circuits.

Claims (1)

[Claims] A PCM signal to which a program number that changes for each complete piece of data is recorded by a rotary head by sequentially forming one diagonal track with the program number at each predetermined single position. A device for performing high-speed playback and searching for the position of a target program number by feeding a recorded recording medium at high speed so that a rotating head scans across a plurality of the diagonal tracks, wherein during the high-speed playback, the rotating head The value of the program number obtained for each scan of the head is compared with the value of the target program number, and if the comparison error value is large, the value determined from the program number obtained by multiple head scans is used. , when the comparison error value is small, the value obtained in the scanning at that time is used for comparison with the target program number, and the position of the target program number is searched from the comparison output. High-speed search device for type PCM signal reproducing device.