JPS62175909A - Digital signal reproducing device - Google Patents

Abstract

PURPOSE:To eliminate an intermittence of a reproducing output at the time of reversing a running direction of a tape, by reversing the running direction of the tape, when a recording end recognition signal has been detected, and making a read speed of a digital signal higher than a normal speed in the course of a prescribed period from the time point of detection of a recording start recognition signal. CONSTITUTION:When a recording end recognition signal RE is detected at the time t13, a running direction of a tape 10 is reversed from the forward direction to the reverse direction. In this case, a running speed of the tape 10 is set to a speed of, for instance, 1.1 times of a normal speed, and also, a rotating speed of heads HA and HB is set to a speed of, for instance, 1.1 times of a normal speed. Also, from a time point t15 immediately after a time point t14 when the tape 10 has become a state that it is run at a speed of, for instance, 1.1 times of the normal speed in the reverse direction, a signal which has been recorded in a track area T2 is read. Next, at a time point t21, a recording start recognition signal RS which has been recorded in a recording start position of a digital sound signal of the other end part side in the longitudinal direction of the track area T2 is detected.

Description

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

A. Field of industrial application B. Overview of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving the problem F. Effect G. Example G-1 configuration (Figures 1 and 2) G-2 Operation (Figs. 1 to 4) G-3 Modification H Effect of the invention A Industrial field of application The present invention is capable of recording data from a plurality of track areas divided in the width direction of a tape. The present invention relates to a digital signal reproducing device that sequentially reproduces digital signals while reversing the running direction of the tape by using a digital memory without causing any output interruption when the running direction of the tape is reversed.

B. Summary of the Invention The present invention utilizes a digital memory to sequentially record digital signals recorded in each of a plurality of track areas divided in the width direction of the tape while reversing the tape running direction. In a digital signal reproducing device that reproduces the output without any interruption when the signal is reversed, the last track in the playback order when sequentially reproducing digital signals from multiple track areas along with the digital signals on the tape. A recording end identification signal is recorded at the recording end position of the digital signal in each track area excluding or including the first track area, and a recording end identification signal is recorded at the recording start position of the digital signal in each track area excluding or including the first track area. , assuming that the recording start identification signal is recorded.
When the recording end identification signal is detected, the running direction of the tape is reversed, and the reading speed when reading digital signals from each track area of the tape is set to normal for a predetermined period of time from the time when the recording start identification signal is detected. The read digital signal is set to a normal speed during the period from the time when the recording start identification signal is detected to the time when the recording end identification signal is detected. During the period from when the recording start identification signal is detected to when the recording end identification signal is detected, the written digital signal is written into the digital memory at a speed proportional to the above read speed, and this written digital signal is used as the recording start identification signal. During the period from the time the signal is detected to the time the recording end identification signal is detected, and from the time the recording end identification signal is detected to the time the recording start identification signal is detected, the recording start identification signal is detected. When the running direction of the tape is reversed by continuously reading from the digital memory at the same speed as the writing speed mentioned above during the period from the time when the above-mentioned predetermined time has passed after detection until the time when the recording end identification signal is detected. It is possible to use a low-cost, low-capacity digital memory to prevent interruptions in playback output, and the playback output can be obtained within a very short time after playback starts. It is something.

C. Conventional technology Digital signals obtained continuously are sequentially transferred to multiple track areas divided in the width direction of the tape while reversing the running direction of the tape.Using digital memory, the running direction of the tape is reversed. In addition, the digital signals recorded in the multiple track areas divided in the width direction of the tape can be recorded without causing any signal dropouts when recording the tape. A digital signal recording and reproducing method has been proposed in Japanese Patent Laid-Open No. 175010/1983, which uses a digital memory to sequentially reproduce tapes while reversing them without causing an output interruption when the running direction of the tape is reversed. .

That is, in JP-A-59-175010, during recording, continuously obtained digital signals are continuously written into a digital memory at a constant speed, and the tape is moved in a first direction or in a second direction opposite to this. During the period when the tape is running at a constant speed in the direction of , digital signals are read from the digital memory at the same speed as the writing speed, but during the period when the tape is running in the opposite direction, reading of digital signals from the digital memory is prohibited. , the digital signals read from the digital memory are sequentially recorded in a plurality of track areas, and during playback, each track area is recorded while the tape is running at a constant speed in the first direction or the second direction. The digital signals read from the tape are written to the digital memory at a constant speed, and the number of times the running direction of the tape is reversed, which is determined by the number of track areas divided in the width direction of the tape, and the number of times the tape is read from the start of playback. Reading of the digital signal from the digital memory is prohibited until the time equal to the time interval when the running direction of the tape is reversed once has elapsed, and the time equal to the time equal to the above product after playback is started has elapsed. From the point in time, digital signals are continuously read out from the digital memory at the same speed as the writing speed, and the digital signals read out from the digital memory are used as reproduction output.

D. Problems to be Solved by the Invention However, in the conventional system described above, the number of track areas divided in the width direction of the tape, and therefore the number of times the tape running direction is reversed, the more the tape running direction becomes A digital memory with a large capacity is required in order to prevent recording signal dropouts when the tape is reversed, and to prevent interruptions in the playback output when the tape running direction is reversed. The waiting time from the start of playback until the playback output is actually obtained becomes longer, for example, the interruption time when the running direction of the tape is reversed once when reading digital signals from digital memory during recording; Assuming that the intermittent time of the digital signal read from the tape during playback and when the tape running direction is reversed once is 1 second, and the data for 1 second of the digital signal is 500 bits. area is 6
Therefore, if the running direction of the tape is reversed a total of 5 times, the capacity of the digital memory is 2500.
K bits are also required, and 5 bits are required after playback starts.
There is an inconvenience that playback output cannot be obtained unless you wait for a few seconds.

In view of the above, the present invention sequentially records digital signals recorded in each of a plurality of track areas divided in the width direction of the tape while reversing the running direction of the tape by using a digital memory. without any interruption in output when direction is reversed.
In a digital signal reproducing device that reproduces a tape, a low-cost digital memory with a small capacity can be used to prevent interruptions in the reproduction output when the running direction of the tape is reversed, and a low-cost digital memory with a small capacity can be used. This allows reproduction output to be obtained within an extremely short period of time.

E. Means for Solving Problems In the present invention, when digital signals are sequentially reproduced from a plurality of track areas divided in the width direction, the reproduction order is odd-numbered. Digital signals are recorded from one longitudinal end side to the other end side in the longitudinal direction, and for even numbered track areas from the other longitudinal end side to one end side, excluding or including the last track area. In each track area, a recording end identification signal is placed at the recording end position of the digital signal on the other end side in the longitudinal direction for odd-numbered track areas, and on one end side in the longitudinal direction for even-numbered track areas. Digital signals recorded on one longitudinal end side for odd-numbered track areas and on the other longitudinal end side for even-numbered track areas in each track area that is recorded and excluding or including the first track area. At the recording start position of each tape with a recording start identification signal recorded on it,
A tape running system capable of running in a first direction and a second direction opposite thereto, and digital signals from each track area of the tape.

a signal reading means for reading a recording end identification signal and a recording start identification signal; a signal detection section for detecting a recording end identification signal and a recording start identification signal from the output of the signal reading means; The tape non-travel direction control unit reverses the running direction of the tape, and the reading speed of the digital signal is made faster than the normal speed for a predetermined period of time from the time when the recording start identification signal is detected, and the recording start identification signal is detected. a reading speed control unit that maintains a normal speed during the period from the time when the predetermined time has elapsed since the above-mentioned predetermined time has elapsed until the time when the recording end identification signal is detected; During the period from the time the identification signal is detected to the time the recording end identification signal is detected,
The written digital signal is written to the digital memory at a speed proportional to the reading speed mentioned above, and the written digital signal is written to the digital memory for the period from the time when the recording start identification signal is detected to the time when the recording end identification signal is detected, and the recording end identification signal. In the period from the time when the signal is detected to the time when the recording start identification signal is detected, and during the period from the time when the above-mentioned predetermined time has passed after the recording start identification signal is detected until the time when the recording end identification signal is detected. A memory controller is provided that continuously reads from the digital memory at the same speed as the above-mentioned write speed.

F-effect In the digital signal reproducing apparatus according to the present invention configured as described above, the running of the tape is constant regardless of the number of track areas divided in the width direction of the tape, and therefore the number of times the running direction of the tape is reversed. The capacity of the digital memory to prevent interruptions in the playback output when the direction is reversed is the capacity of the digital memory to prevent the reproduction output from being interrupted when the direction of the tape is reversed. The number of bits corresponding to the interruption time, for example, 500 bits, is enough, and a low-cost digital memory with a small capacity can be used. If the reading speed of the digital signal and the writing speed of the read digital signal to the digital memory are made faster than the normal speed, the playback output will be obtained at the same time as playback starts, and the end of recording will be recognized from the time playback starts. Even if the reading speed of the digital signal from the tape and the writing speed of the read digital signal to the digital memory are normal during the period up to the time when the signal is detected, the speed of reading the digital signal from the tape and the writing speed of the read digital signal to the digital memory are set to normal speeds. The time from when the recording end identification signal is detected to when the recording start identification signal is detected when the running direction is reversed, that is, the time from when the tape running direction of the digital signal read from the tape is reversed once. Reproduction output can be obtained after a certain period of time corresponding to the intermission time, for example, after one sand diameter, and reproduction output can be obtained within a very short time after reproduction is started.

G Example G-1 Configuration (Figures 1 and 2) Figure 1 shows an example of a digital signal reproducing device according to the present invention, in which a digital audio signal that has been pulse code modulated and time-compressed is converted into a so-called 8 mm - This is a case where data is recorded in six track areas divided in the width direction of a magnetic tape using a recording format adapted from a recording format used in a video tape recorder.

The magnetic tape 10 is wound obliquely over an angular range of 216 degrees or more around a head drum 20 containing two rotating magnetic heads HA and HB for reproduction, and is held between a capstan 31 and a pinch roller 32 and run. It will be done. The capstan 31 moves the tape 10 in a first direction indicated by arrow F (hereinafter referred to as the forward direction) or in a second direction indicated by arrow R (
It is rotationally driven so as to run in the reverse direction (hereinafter referred to as the reverse direction). Therefore, a tape running direction control signal is supplied from the tape running direction control section included in the system control section 100 to the capstan driving section 33. Further, a reading speed control signal is supplied from the reading speed control section included in the system control section 100 to the capstan driving section 33, and the running speed of the tape 10 is changed between a normal speed and a normal speed, for example, 1. Controlled to either 1x speed. Note that the tape running direction control signal obtained from the tape running direction control section and the reading speed control signal obtained from the reading speed control section are also applied to the reel drive section that drives the reels on one end side and the other end side of the tape 10. The rotational direction and rotational speed of each reel are controlled according to the rotational direction and rotational speed of the capstan 31.

The heads HA and HB are attached so as to slightly protrude from the outer peripheral surface of the head drum 20 with an angular interval of 180 degrees, and are rotationally driven by the head drive section 41. A read speed control signal is supplied to the head drive unit 41 from the read speed control unit, and the rotational speed of the heads HA and HB is set to a normal speed of 30 revolutions/second and, for example, 1.1 times the normal speed, as described later. controlled to one of the following speeds. A rotational phase detection unit 42 for detecting the rotational phase of the heads HA and HB is provided for the heads HA and HB, and the rotational phase detection unit 42 detects the rotational phases of the heads HA and HB.
A detection signal of the rotational phase of is supplied to the system control unit 100. Note that the heads HA and HB have different azimuth angles.

The heads HA and HB each move the tape 1o from a certain rotational position to the other side of the tape 1o as shown by the arrow H in FIG.
scan in a direction oblique to the longitudinal direction. and,
The area scanned by the heads HA and HB of this tape 10 during 216 degrees of rotation is divided into six track areas T1 to T6 having equal widths in the width direction of the tape IO, as shown in FIG. A large number of recording tracks St are formed in each of the track areas T1 to T6 which are divided and inclined with respect to the longitudinal direction of the tape 10,
A digital audio signal is recorded. However, track area Tl - track area T2 - track area T3 → track area T4 - track area T5 -) rack area T6
Assuming that digital audio signals are sequentially reproduced from each track area T1-T6 in the order of is from the other end side to the one end side in the longitudinal direction, from one end side to the other end side in the longitudinal direction for the track area T3, from the other end side to the one end side in the longitudinal direction for the track area T4, The track area T5 is recorded from one longitudinal end to the other end, and the track area T6 is recorded from the other longitudinal end to one end. Also, the track area T1
~ In T5, a recording end identification is displayed at the recording end position of the digital audio signal on the other end side in the longitudinal direction for the track areas TI, T3, and T5, and on the one end side in the longitudinal direction for the track areas T2 and T4. In the track areas T2 to T6, where signals are recorded, track areas T2. A recording start identification signal is recorded at the recording start position of the digital audio signal on the other end side in the longitudinal direction for T4 and T6, and on one end side in the longitudinal direction for track areas T3 and T5.

However, the digital audio signals in each of the track areas Tl to T6 are pulse code modulated, and either one of the two rotary magnetic heads for recording similar to the rotary magnetic heads HA and HB for reproduction is input to each track area T.
The data is time-compressed and recorded within the period of scanning 1 to T6.
For example, the digital audio signal in the pulse code modulated and time-compressed state is added as digital data to the end of the pulse code modulated and time-compressed digital audio signal within the period of scanning the recording track S.
The recording start identification signal is inserted as digital data during a period in which one of the two recording rotary magnetic heads scans each of the track areas T2 to T6, and the recording start identification signal is This is recorded on a plurality of tracks St.

The outputs of the heads HA and HB obtained when the heads HA and HB scan the tape 10 are supplied to the head switching circuit 43, and the head switching circuit 4 is output from the system control unit 100.
3, the head switching circuit 4
3, head HA is calculated from the outputs of heads HA and HB.
Or HB is track area Tl, T2 . T3. T4. T
5 or T6 is extracted, the track areas TI, T2 . T3, T
4. The signal recorded at T5 or T6 is read.

The signal obtained from the head switching circuit 43 is amplified in a regenerative amplifier circuit 44 and supplied to a digital processing section 50 controlled by a system control section 100. In the digital processing section 50, the pulse code modulated and time compressed intermittent digital audio signal in the signal obtained from the head switching circuit 43 through the reproduction amplification circuit 44 is expanded in accordance with the compression ratio at the time of recording. The time is stretched by the ratio to make it continuous. Digital processing section 50
includes a signal detection section that detects a recording end identification signal and a recording start identification signal, and a recording end identification signal RE and a recording start identification signal R3 obtained from this signal detection section are supplied to the system control section 100. The digital audio signal obtained from the digital processing section 50 is transferred to a first-in, first-out (FIFO) type digital memo IJ60.
is supplied to The writing of digital audio signals into the digital memory 60 and the reading of digital audio signals from the digital memory 60 are performed by the system control unit 10.
This is performed by the memory control unit included in 0 as described below. The digital audio signal obtained from the digital memory 60, that is, read out from the digital memory 60, is supplied to the digital/analog conversion section 70 controlled by the system control section 100, and is pulse code demodulated, that is, converted into an analog signal. The audio signal is output to the output terminal 80. Note that command signals obtained by various operations on the operation section 90 are supplied from the operation section 90 to the system control section 100.

G-2 operation (FIGS. 1 to 4) For example, the track area T of the tape 1o is
By performing an operation to perform playback from the recording start position of the digital audio signal on one end side in the longitudinal direction of the tape 1o, as shown in FIG.
is driven at normal speed in the forward direction. Heads HA and HB are also rotated at a normal speed of 30 revolutions/second. Therefore, the reading speed of the signal from the tape 1o is set to the normal speed. During the period from time point t to time point t13, which will be described later, head switching circuit 43 scans the track area TI from the outputs of heads HA and HB as shown in the third stage of FIG. The signals obtained during the period are extracted and the signals recorded in the track area T1 are read. The time-compressed intermittent digital audio signal is time-expanded in the digital processing section 50, and a continuous digital audio signal read from the track area TI at a normal reading speed is obtained from the digital processing section 50. .

Track area T1 continuously obtained from this point tll
The digital audio signal data read without time compression is written into the digital memory 60 at a normal writing speed from time t. After a recording end identification signal RE is detected when the running direction of the tape 10 is reversed from time t, a recording start identification signal R is detected.
Reading of data from the digital memory 60 is prohibited until a certain period of time corresponding to the time until 3 is detected, and therefore the amount of data stored in the digital memory 60 gradually increases.

Then, from time point tp, which has elapsed from time point t, the data written in digital memory 60 is continuously read out from digital memory 60 at a speed equal to the normal writing speed. When the recording end identification signal RE recorded at the recording end position of the digital audio signal on the other end side in the longitudinal direction of the track area T1 is detected at time t13, writing to the digital memory 60 is prohibited.

When the recording end identification signal RE is detected at time t1), the running direction of the tape IO is reversed from the forward direction to the reverse direction. In this case, the running speed of the tape 10 is set to, for example, 1.1 times the normal speed, and the rotational speed of the heads HA and HB is also set to, for example, 1.1 times the normal speed. Then, a time LIS immediately after the time t14 when the tape 10 is made to run in the reverse direction at a speed that is, for example, 1.1 times the normal speed.
From there, the signal recorded in the track area T2 is read. That is, during the period from time t's to time t23, which will be described later, the head switching circuit 43 causes the head HA or HB to scan the track area T2 from the outputs of the heads HA and HB as shown in the fourth stage of FIG. The signals obtained during the period are extracted and the signals recorded in the track area T2 are read, and first, at time tz+, the signals are recorded at the recording start position of the digital audio signal on the other end side in the longitudinal direction of the track area T2. A recording start identification signal R3 is detected.

At the time tl when the above-mentioned recording end identification signal RE is detected and writing to the digital memory 60 is prohibited,
The digital memory 60 has captured data for the time from time tll to time tp, that is, from time t13 to time tz+, and this data is
It is read from the digital memory 60 during the period from time t13 to time t2I. That is, during the period from time t to time t13, the digital processing unit 50
The digital audio signal obtained from the digital audio signal is obtained from the digital memory 60 in the period from time tp to time tz+ after the above-mentioned fixed time delay.

The time-compressed intermittent digital audio signal read from the track area T2 is time-expanded in the digital processing section 50, and outputted from the digital processing section 50 as the time point t.
A continuous digital audio signal is obtained from z+, but in the period from time tz+ to time t2□ described below,
The running speed of the tape 10 and the rotational speed of the heads HA and HB are each set to, for example, 1.1 times the normal speed, and the reading speed of the signal from the tape 10 is set to, for example, 1.1 times the normal speed. The digital processing unit 50
A continuous digital audio signal is obtained through time compression. Then, the data of the digital audio signal read out in a time-compressed manner from the track area T2 continuously obtained from this time point tz+ is transferred from the time point tz+ to the digital memory 60 at a speed proportional to the reading speed of the signal from the tape 10. That is, the data is written at a speed that is, for example, 1.1 times the normal speed. This written data is read out continuously from time tz+ at a speed equal to the normal writing speed described above. Therefore, after time tz+, the amount of data accumulated in the digital memory 60 increases at a lower rate than the rate of increase during the period from time t1) to time tp, that is, the reading speed of signals from the tape 10 after time t). and time t if the writing speed of the data of the digital audio signal into the digital memory 60 is made 1.1 times the normal speed as described above.

It gradually increases at a rate of 1/10 of the increase rate during the period from to time point tp.

At time t2□, when the amount of data accumulated in this digital memory 60 becomes equal to the amount of data for the time from the eye to time tp, the time point of the digital audio signal obtained from the digital processing unit 50 under normal reading speed. ,
That is, if the reading speed of the signal from the tape 10 and the writing speed of the data of the digital audio signal into the digital memory 60 after the time tz+ are set to 1.1 times the normal speed as described above, then the speed at the time tz+ At time t, which is 10 times the time from time t to time jp, the running speed of the tape 10 and the head HA are
and HB rotation speed are respectively set to normal speed,
The reading speed of the signal from the tape IO is set to a normal speed, and the writing speed of the data of the digital audio signal to the digital memory 60 is set to the normal speed. When the recording end identification signal RE recorded at the recording end position of the digital audio signal on the one end side in the longitudinal direction of the track area T2 is detected at time tZ3, writing to the digital memory 60 is prohibited.

When the recording end identification signal RE is detected at time t23, the running direction of the tape 10 is reversed from the reverse direction to the forward direction. In this case, the running speed of the tape 10 is set to, for example, 1.1 times the normal speed, and the rotational speed of the heads HA and HB is also set to, for example, 1.1 times the normal speed. Then, a time tz immediately after the time tin when the tape 10 is made to run in the forward direction at a speed that is, for example, 1.1 times the normal speed.
The signal recorded in the track area T3 is read from s. That is, in the period from time t□ to time t33, the head switching circuit 43 changes the output from the heads HA and HB to the period in which the heads HA or HB scans the track area T3 as shown in the fifth stage of FIG. The obtained signal is extracted and the signal recorded in the track area T3 is read, and first, at time t31, a recording start identification signal is recorded at the recording start position of the digital audio signal on one end side in the longitudinal direction of the track area T3. R
3 is detected.

At time t2, when the above-mentioned recording end identification signal RE is detected and writing to the digital memory 60 is prohibited, the digital memory 6o stores data for the time from time t to time tp, that is, from time t0 to time t31. This data is read out from the digital memory 6o during the period from time tzs to time t and l.

As shown in FIG. 3, similar operations are repeated thereafter. Therefore, reproduction output can be obtained without interruption after time tp.

G-3 Modification When the recording end identification signal RE of the track area is played back from a location that is more than a certain distance away from the recording end position of the recorded digital audio signal, the recording end identification signal RE of the track area is played back from a location that is a certain distance or more away from the recording end position of the recorded digital audio signal, as shown by the dashed line in FIG. , even after the time tl+ when playback is started, there is a time t□+ at which the recording start identification signal R8 is detected.
L31+t41...Similarly to the following, the time t of the digital audio signal obtained from the digital processing unit 50 at the above-mentioned normal reading speed is stored in the digital memory 60.
Until the time when data for the time period from ll to time tp is captured, the running speed of the tape 10 and the rotational speed of the heads HA and HB are respectively normal speeds, for example, 1.
1 times the speed, so that the reading speed of the signal from the tape IO is, for example, 1.1 times the normal speed, and the digital memory 6 of the data of the digital audio signal is
A time point t when the writing speed to 0 is set to, for example, 1.1 times the normal speed, and reproduction from the digital memory 60 is started.

Data can be read from.

Note that the present invention provides a method for recording a digital signal from each track area of a tape on which a plurality of tracks extending in the longitudinal direction are formed in a plurality of track areas divided in the width direction, and digital signals are recorded thereon. It can also be applied to the case where digital signals recorded on a track extending in the longitudinal direction are sequentially read and reproduced by a fixed multi-head while being reversed in the running direction of the tape.

H Effects of the Invention According to the present invention, regardless of the number of track areas divided in the width direction of the tape and therefore the number of times the tape running direction is reversed, the playback output when the tape running direction is reversed. The capacity of the digital memory to prevent interruptions is the number of bits corresponding to the interruption time when the tape running direction of the digital signal read from the tape is reversed once, e.g. 500 bits is enough, and a low-cost digital memory with small capacity can be used, and the read speed of digital signals from the tape and the read digital signals can be controlled even during a predetermined period of time from the time when playback is started. If the writing speed to the digital memory is faster than the normal speed, the playback output will be obtained at the same time as playback starts, and the period from the time playback starts until the end of recording identification signal is detected. Even if the reading speed of digital signals from the tape and the writing speed of the read digital signals to the digital memory are set to normal speeds, recording when the running direction of the tape is reversed from the time playback is started. The time from when the end identification signal is detected to when the recording start identification signal is detected, that is, a certain period of time corresponding to the interval time when the running direction of the digital signal read from the tape is reversed once, e.g. Reproduction output can be obtained from the time when one sand diameter is reached, and reproduction output can be obtained within a very short time after reproduction is started.

[Brief explanation of drawings]

゛FIG. 1 is a diagram showing the configuration of an example of a digital signal reproducing device according to the present invention, FIG. 2 is a diagram showing an example of the recording format of a tape for reproducing digital signals, and FIG.
A time chart for explaining the operation in the illustrated example,
FIG. 4 is a diagram showing how signals are read from each track area. In the figure, 10 is a magnetic tape, HA and HB are rotating magnetic heads for reproduction, 31 is a capstan, 43 is a head switching circuit, 50 is a digital processing section including a signal detection section, 60 is a digital memory, and 70 is a digital/analog A conversion section 80 is an output terminal from which an audio signal is obtained, and 100 is a system control section including a tape running direction control section, a reading speed control section, and a memory control section.

Claims (2)

[Claims] (1) When digital signals are sequentially reproduced from a plurality of track areas divided in the width direction, for track areas whose playback order is an odd number, from one end in the longitudinal direction to the other end. For even-numbered track areas, digital signals are recorded from the other end to one end in the longitudinal direction, and for odd-numbered track areas in each track area excluding or including the last track area. A recording end identification signal is recorded at the recording end position of the digital signal on the other end side in the longitudinal direction, and for even-numbered track areas, on one end side in the longitudinal direction, and except for the first track area or A recording start identification signal is placed at the recording start position of the digital signal on one longitudinal end side for odd-numbered track areas and on the other longitudinal end side for even-numbered track areas in each track area. a tape running system capable of running a tape on which has been recorded in a first direction and a second direction opposite thereto; a signal reading means for reading a recording start identification signal; a signal detection section for detecting the recording end identification signal and the recording start identification signal from the output of the signal reading means; a tape running direction control unit that reverses the running direction; and a tape running direction control unit that makes the reading speed of the digital signal faster than the normal speed for a predetermined period of time from the time when the recording start identification signal is detected; a reading speed control section that controls the reading speed to a normal speed during the period from the time when the predetermined time has elapsed after the detection to the time when the recording end identification signal is detected; a digital memory; writing in the digital memory at a speed proportional to the reading speed during the period from the time when the start identification signal is detected to the time when the recording end identification signal is detected;
This written digital signal is used for the period from when the recording start identification signal is detected to when the recording end identification signal is detected, and from the time when the recording end identification signal is detected to the recording start identification signal. is detected, the digital memory is written at the same speed as the writing speed during the period from the time when the recording start identification signal is detected to the time when the recording end identification signal is detected. A digital signal reproducing device comprising a memory control unit that continuously reads data from the memory. (2) When digital signals are sequentially reproduced from a plurality of track areas divided in the width direction, for track areas whose playback order is an odd number, from one end in the longitudinal direction to the other end. For even-numbered track areas, digital signals are recorded from the other end to one end in the longitudinal direction, and for odd-numbered track areas in each track area excluding or including the last track area. A recording end identification signal is recorded at the recording end position of the digital signal on the other end side in the longitudinal direction, and for even-numbered track areas, on one end side in the longitudinal direction, and except for the first track area or A recording start identification signal is placed at the recording start position of the digital signal on one longitudinal end side for odd-numbered track areas and on the other longitudinal end side for even-numbered track areas in each track area. a tape running system capable of running a tape on which has been recorded in a first direction and a second direction opposite thereto; a signal reading means for reading a recording start identification signal; a signal detection section for detecting the recording end identification signal and the recording start identification signal from the output of the signal reading means; a tape running direction control unit that reverses the running direction; and a tape running direction control unit that makes the reading speed of the digital signal faster than the normal speed for a predetermined time period from the time when the recording start identification signal is detected, and when playback starts. The speed is normal during the period from when the recording end identification signal is detected to when the recording end identification signal is detected, and from the time when the predetermined time has passed after the recording start identification signal is detected to the time when the recording end identification signal is detected. a reading speed control unit that controls the reading speed of the read digital signal; During the period from the time when the recording end identification signal is detected, the data is written to the digital memory at a speed proportional to the reading speed, and the written digital signal is transferred to the tape from the time when playback is started. The recording ends from the time when playback starts, which corresponds to the period from when the recording end identification signal is detected until the recording start identification signal is detected when the running direction of the is reversed. The above writing speed is the same as the writing speed during the period up to the point in time when the identification signal is detected, and the period from the point in time when the above-mentioned predetermined time has elapsed after the above-mentioned recording start identification signal is detected until the point in time when the above-mentioned recording end identification signal is detected. A digital signal reproducing device comprising a memory control section that continuously reads data from a digital memory.