JPH0865633A - Image signal recording device, reproducing device, and recording and reproducing device - Google Patents

Abstract

PURPOSE: To record and reproduce a digital image signal having a variable rate on and from a common recording medium through single head constitution while securing compatibility with an existing analog VTR. CONSTITUTION: An analog image and an audio signal are recorded on a video track and its deep-layer track by magnetic heads 201a and 201b, and 202a and 202b. A digital image and an audio signal are recorded on two adjacent tracks by magnetic heads 203a and 203b, and 203c and 203d. At this time, a discrimination signal generating circuit 153 generates a discrimination signal for deciding the recorded signals at the time of reproduction and PWM modulation is imposed on a control signal with the discrimination signal, so that the signal is recorded on a control track by a magnetic head 204.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic image recording and / or reproducing apparatus for digital image signals, and more particularly to an image signal recording and / or reproducing apparatus compatible with existing analog VTRs.

[0002]

2. Description of the Related Art At present, an analog VTR using a 1/2 inch wide oxide tape is put into practical use as a household image signal recording / reproducing apparatus.

On the other hand, digital broadcasting is being put to practical use as a next-generation TV broadcasting. For example, in the United States,
Wideband image signal with higher resolution (hereinafter referred to as High) than the current image signal of NTSC system or PAL system (hereinafter referred to as Standard Definition; SD image signal).
There is known an ATV (advanced television) system in which a high-definition digital compression coding of a definition (HD image signal) is performed and broadcast with a bandwidth of 6 MHz which is the same as the current TV broadcast. In addition, regarding the SD image signal, MPEG is also used.
A system is known in which high-efficiency digital compression coding is performed by using the (Moving Picture Experts Group) system, and broadcasting is performed through a satellite or a moving axis cable.

Regarding these digital broadcasting systems, Journal of Television Society, Vol. 47, No. 4 (19)
1993), pp. 486-503.

[0005]

It is considered that these digital TV broadcasts will be put into practical use in the near future and will be implemented in a form mixed with analog TV broadcasts. However, in the conventional analog VTR, these digital image signals are used. It was not possible to record and reproduce the digital signal as it was.

An object of the present invention is to record and reproduce an image signal which is compatible with the current analog VTR and which can further record and reproduce a digital compression coded image and audio signal such as digital TV broadcast as a digital signal. / Or providing a playback device.

[0007]

In order to achieve the above object, an image signal recording / reproducing apparatus according to the present invention comprises a first magnetic head for recording / reproducing an analog image signal, a first magnetic head for recording / reproducing a digital image signal. Digital recording signal processing means for formatting the second and third magnetic heads, a fourth magnetic head for recording / reproducing a signal for discriminating between analog and digital, and a digital image signal, and further for recording coding (modulation). And an analog / digital selecting means for selecting whether the signal to be recorded is an analog image signal or a digital image signal, and the first or second and third means by the analog / digital selecting means.
First switching means for switching the signal to be supplied to the magnetic head, analog / digital discrimination means for discriminating whether the recorded signal is an analog image signal or a digital image signal, and the analog / digital discrimination means for the first, Alternatively, it is provided with a second switching means for switching the signals reproduced by the second and third magnetic heads, and a digital reproduction signal processing means for demodulating the reproduced digital image signal and performing processing such as error correction.

Further, the image signal recording / reproducing apparatus according to the present invention comprises a servo means having a function of switching the running speed of the magnetic tape according to the transmission rate of the digital image signal to be recorded or recorded.

[0009]

The digital image signal is added to an error correction code by the digital recording signal processing means to be divided into blocks, which are further recording-encoded (modulated) and then recorded on the magnetic tape by the second and third magnetic heads. It is recorded on two adjacent tracks formed in the diagonal direction. At this time, by the time base processing in the digital recording signal processing means, recording is performed at a substantially constant recording rate regardless of the transmission rate of the input digital image signal. The servo circuit rotates the rotation speed of the rotary drum at a substantially constant speed similar to the recording rate, and switches the running speed of the magnetic tape according to the transmission rate of the input digital image signal.

An identification signal indicating that the recorded signal is a digital image signal is recorded on a so-called linear track in the longitudinal direction of the magnetic tape by the fourth magnetic head.

During reproduction, the analog / digital discrimination means detects the discrimination signal recorded on the linear track and discriminates whether the recorded signal is an analog image signal or a digital image signal. Then, the reproduced digital image signal is subjected to processing such as demodulation and error correction by the digital reproduction signal processing means to be restored to the original digital image signal.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an image signal recording apparatus according to the present invention. Where 101,10
2, 103 are input terminals, 110 is an analog image recording signal processing circuit, 120 is an analog audio recording signal processing circuit, 1
30 is a digital recording signal processing circuit, 151 is an analog / digital selection circuit, 152 is a digital recording mode selection circuit, 153 is an identification signal generation circuit, 181, 18
2, 183a, 183b are changeover switches, 191, 19
2, 193a, 193b and 194 are recording amplifiers.
Further, 200 is a rotating drum, 201a, 201b, 20
2a, 202b, 203a, 203b, 203c, 20
3d and 204 are magnetic heads, 210 is a magnetic tape, 22
Reference numeral 0 is a servo circuit.

First, the operation of recording an analog image signal will be described.

In FIG. 1, the analog image signal input from the input terminal 101 is, for example, FM-modulated in its luminance signal and low-frequency converted in the color difference signal in the analog image recording signal processing circuit 110, and they are added. The converted analog image recording signal SR1 is converted. Figure 2
(A) shows an example of the band of the analog image recording signal SR1.

On the other hand, the analog voice signal input from the input terminal 102 is processed by the analog voice recording signal processing circuit 120.
In, for example, the audio signals of the left / right or the positive / secondary two channels are respectively FM-modulated and converted into an analog audio recording signal SR2 in which they are added. Figure 2 (B)
Shows an example of the band of the analog voice recording signal SR2.

Here, the analog / digital selection circuit 1
When the analog image signal is selected as the signal to be recorded by 51, the output control signal CR1 turns on the changeover switches 181 and 182, respectively, and the analog image recording signal SR1 and the analog audio recording signal SR2 are respectively recorded by the recording amplifier 191. Magnetic head 2 through 192
01a, 201b and 202a, 202b. At this time, the changeover switch 1 is controlled by the control signal CR1.
83a and 183b are turned off, respectively, and nothing is supplied to the magnetic heads 203a and 203b and 203c and 203d.

Further, the servo circuit 220 includes the rotary drum 2
The rotation speed R of 00 is set to a predetermined rotation speed R1 (for example, 30 rps, which is the same as the frame frequency of the analog image signal),
The traveling speed V of the magnetic tape 210 is set to a predetermined traveling speed V1.
(For example, 33.35 m / s).

FIG. 3 shows an example of the recording pattern at this time. First, an analog audio recording signal SR2 is recorded on the magnetic tape 210 by the magnetic head 202a or 202b, and the track width Tw2 (for example, 1
9 to 30 μm) of the analog audio track 212a or 212b is formed. Next, the magnetic head 2 is placed on the analog audio track 212a or 212b.
The analog image recording signal S by 01b or 201a
HR1 is overwritten and recorded, and the track width Tw1 (for example, 4
An analog video track 211b or 211a of 0 to 58 μm) is formed. Incidentally, Tp represents a track pitch, and is set to 58 μm, for example.

Next, the operation of recording a digital image signal will be described.

In FIG. 1, an input terminal 103 receives, for example, a digital image and audio signal highly efficient compression coded by the MPEG system, and the digital recording signal processing circuit 130 inputs interleave, error correction code and synchronization. Formatting processing such as signal addition and block formation is performed, and recording coding (modulation) is performed and converted into two systems of digital recording signals SR3a and SR3b.

Here, if the same oxide tape as used for analog recording is used as the magnetic tape 210, the recording rate of the digital recording signals SR3a and SR3b can be increased to about 20 Mbps with a high-performance tape having a high holding power. Is. A total recording rate of about 40 Mbps is possible for the two systems. At this time, the transmission rate of the input signal is about 25 Mb even if the redundancy due to the formatting process in the digital recording signal processing circuit 130 is taken into consideration.
ps can be secured. On the other hand, the transmission rate of the high-efficiency compression-encoded digital image and audio signals is about 20 Mbps at maximum even in the case of HDTV signals. Therefore, this digital HDV signal can be recorded on the same oxide tape as analog recording. Thus, the present invention
This is done in view of the fact that the progress of high-efficiency image compression technology has made it possible to record digital image signals with a bandwidth close to that of analog image signals.

In the above example, the maximum input rate is about 25 bps and the actual input rate is about 20M.
There is a margin of about 5 bps with bps. In this case, a signal for special reproduction may be recorded for this extra data. On the other hand, SDT which is highly efficient compression coded by the MPEG-2 system.
The transmission rate of the V signal has a range of about 2 Mbps to 10 Mbps. In this case, the feeding speed of the magnetic tape 210 is gradually reduced to enable long-time recording. Hereinafter, these operations will be described in detail.

When a digital image signal is selected as a signal to be recorded by the analog / digital selection circuit 151, the changeover switch 1 is operated by the output control signal CR1.
83a and 183b are turned on, and the digital recording signals SR3a and SR3b are output to the recording amplifier 193, respectively.
It is supplied to the magnetic heads 203a, 203b and 203c, 203d via a, 193b. At this time, the changeover switches 181 and 182 are turned off by the control signal CR1 and the magnetic heads 201a, 201b and 2 are turned off.
Nothing is supplied to 02a and 202b. Incidentally, the magnetic heads 203a and 203b and the magnetic heads 203c and 20
3d are attached at positions facing each other by 180 degrees on the rotary drum 200, at a predetermined level and close to each other (for example, on the same head base).

The digital recording mode selection circuit 152 includes
According to the transmission rates of the input digital image and audio signals, for example, one is selected from three modes of high speed, medium speed, and low speed, and the output control signal CR2 is output.

Here, a high transmission rate (for example, 15 to 2)
5 Mbps digital image and audio signals (eg,
In the high-speed mode for recording the above HDTV signal),
The servo circuit 220 is the analog / digital selection circuit 1
The rotary drum 2 receives the control signal CR1 from the control circuit 51 and the control signal CR2 from the digital recording mode selection circuit 152.
The rotational speed R of 00 is controlled to the same rotational speed R1 as when the analog image signal is recorded, and the traveling speed V of the magnetic tape 210 is also controlled to the traveling speed V1. The recording amplifier 193a,
Two systems of digital recording signals SR3a and SR3b supplied via 193b are supplied to the magnetic heads 203a and 203a.
b and the magnetic heads 203c and 203d are alternately used,
Four tracks of azimuth are recorded per one rotation of the rotary drum 200.

The recording rate at this time is irrespective of the transmission rates of the input digital image and audio signals.
Recording is performed at a substantially constant recording rate determined by the recording density of the magnetic tape 210. Then, the maximum input rate (eg, about 25 Mbps) is determined from this recording rate (eg, about 20 Mbps as described above when the magnetic tape 210 is a high-performance oxide tape). Data is added, or, as described above, special reproduction data is added and recording is performed at a substantially constant recording rate.

FIG. 4 is a waveform diagram showing the relationship between the rotation of the rotary drum 200 and the timing of the digital recording signals SR3a and SR3b at this time. Here, (A) is the rotary drum 200, (B) and (C) are digital recording signals SR.
3A and SR3b respectively, and in the low level period in (A), the magnetic heads 203a and 203b
Recorded by the magnetic head 203 during a high level period.
c, 203d shows the period recorded. Thus, in the high speed mode, continuous recording signals SR3a and SR3b are recorded as shown in (B) and (C).

FIG. 5 shows an example of the recording pattern at this time. The magnetic head 210 is attached to the magnetic tape 210.
03a and 203b, or 203c and 203d, digital image and audio recording signals SR3a and SR3b are recorded, and first and second digital signal tracks 213a, 213b, or 213c having track widths Tw3a and Tw3b (for example, 29 μm) are recorded. 213d is formed. The track pitch Tp is, for example, 58 μm, as in the recording of the analog image signal.

On the other hand, in the case of the medium speed mode for recording a digital image and a sound signal (for example, a SDTV signal of a fast moving moving image such as a sports program) having a medium transmission rate (for example, 1/2 of the high transmission rate). As shown in FIGS. 4 (D) and 4 (E), the digital recording signal processing circuit 130 performs two-time burst recording in which the time axis compression is halved for each rotation of the rotary drum 200. Signal SR3
a, SR3b are output. At this time, the servo circuit 20
0 is the same as the rotational speed R1 of the rotary drum 200 in the analog image signal recording and high speed mode, and the running speed V of the magnetic tape 210 is 1/2 of the analog image signal recording and high speed mode. Control to the speed (V1 / 2). The two systems of digital recording signals SR3a, supplied via the recording amplifiers 193a and 193b,
SR3b is recorded on four tracks of azimuth by two rotations of the rotary drum 200 only by the magnetic heads 203a and 203b.

Similarly, in the case of the low speed mode for recording a digital image and a voice signal (for example, an SDTV signal of a slow moving moving image such as a news program) having a low transmission rate (for example, 1/4 of the above high transmission rate). From the digital recording signal processing circuit 130, as shown in FIGS. 4 (F) and 4 (G), recording is performed in two burst-like systems, in which the time axis compression is ¼ for each rotation of the rotary drum 200. Signal SR3
a, SR3b are output. The servo circuit 200 records the rotation speed R of the rotary drum 200 when recording an analog image signal.
The rotational speed R1 is controlled to be the same as that in the high speed and medium speed modes, and the traveling speed V of the magnetic tape 210 is controlled to 1/4 the traveling speed (V1 / 4) in the analog image signal recording and high speed mode. Then, the two systems of digital recording signals SR3a, S supplied through the recording amplifiers 193a, 193b.
R3b uses only the magnetic heads 203a and 203b.
Four rotations of the rotary drum 200 record four tracks of azimuth.

As described above, when recording a digital image and audio signal with a low transmission rate with reference to a digital image and audio signal with a high transmission rate, the time base compression ratio should be changed according to the transmission rate ratio. As a result, the recording rate becomes constant regardless of the transmission rate. Even if the transmission rate ratio is not an integer, for example,
By adding dummy data, the time base compression ratio can be made an integer.

The servo circuit 220 sets the rotation speed R of the rotary drum 200 to a constant rotation speed R1 and the magnetic tape 210.
The traveling speed V of 1 is controlled to a traveling speed (V1 / N) of 1 / N (N is the time base compression ratio) of the traveling speed V1. Therefore,
The recorded track pattern is the same as the pattern shown in FIG.

Incidentally, FIGS. 4 (D), (E) and (F),
In (G), the time axis compression ratio N is set to 2 and 4, but this N may be any integer. That is, when N is an even number, as shown in the figure, the magnetic heads 203a,
203b only, in the case of an odd number, the magnetic head 203
Since the signals a, 203b and the magnetic heads 203c, 203d are time-compressed are recorded alternately, the operation of four-track azimuth recording is unchanged by N rotations of the rotary drum 200. Therefore, the magnetic tape 2 including N = 1, that is, the case of a high transmission rate digital image and audio signal is also included.
The track format recorded in 10 is standardized. The only difference is that the total time that can be recorded on the magnetic tape 210 increases or decreases according to the time-axis compression ratio N. That is, for example, high-quality digital HDTV signals can be recorded in standard time, and digital SDTV signals can be recorded in long time. It is also possible to record multiple programs of digital SDTV signals using the high transmission mode.

FIG. 6 is a block diagram showing an example of the configuration of a digital recording signal processing circuit 130 for performing such processing. 131 is an interface circuit, 132 is a memory circuit, 133 is a parity generating circuit, and 134 is a recording signal generating circuit. Reference numeral 135 is a modulation circuit, and 136 is a timing circuit. Here, the input digital image and audio signal S
S is a memory circuit 13 via the interface circuit 131.
2 is stored. The parity generation circuit 133 generates a parity from the data SS stored in the storage circuit 132 and stores it in the storage circuit 132. The recording signal generation circuit 134 reads the data and parity stored in the storage circuit 132, adds the synchronization signal and the ID signal,
Two types of signals in block format as shown in FIG. 7 are output. At this time, interleave processing is also performed.

FIG. 8 shows an example of the structure of the ID signal. For example, a track number for identifying a recording track, a block number for identifying a position in the track, a recording time on a tape, a program number, etc. It is composed of control information and a parity for detecting and correcting these errors.
A signal for identifying the recording mode and the transmission rate is also inserted in the control information of the ID signal.

In this way, interleaving, synchronizing signals and I
The D signal, the two-system signal subjected to the formatting processing such as the addition of the error correction code, and the block formation are so-called recording-coded such as the run length limitation in the modulation circuit 135, and the two-system digital recording signal SR3a,
Converted to SR3b. The timing circuit 136 receives the control signal CR2 and receives the interface circuit 131,
The timings of the memory circuit 132, the parity generation circuit 133, the recording signal generation circuit 134, and the modulation circuit 135 are controlled.

The identification signal generation circuit 153 receives the control signal CR1 from the analog / digital selection circuit 151 and the control signal CR2 from the digital recording mode selection circuit 152, and determines the type and mode of the signal recorded on the reproducing side. Generate an identification signal for Then, this identification signal is supplied to the magnetic head 204 via the recording amplifier 194 and recorded on a so-called linear track in the longitudinal direction of the magnetic tape 210.

As the linear track, an audio track or a control track may be used.
When an audio track is used, an analog audio signal is recorded as before when an analog image signal is recorded, and the above identification signal is recorded when a digital image signal is recorded. When the control track is used, the control signal is recorded in the conventional manner when the analog image signal is recorded, and when the digital image signal is recorded, for example, the control signal is pulse-width modulated by the identification signal and recorded. With these,
It is not necessary to newly add the recording amplifier 194 and the magnetic head 204, and the apparatus can be simplified and the cost can be reduced.

FIG. 9 is a block diagram showing an embodiment of the image signal reproducing apparatus according to the present invention. Here, 301, 30
2, 303 are output terminals, 310 is an analog image reproduction signal processing circuit, 320 is an analog audio reproduction signal processing circuit, 3
30 is a digital reproduction signal processing circuit, 351 is an analog / digital discrimination circuit, 352 is a digital recording mode discrimination circuit, 353 is an identification signal detection circuit, 381, 38.
2, 383a, 383b are changeover switches, 391, 39
2, 393a, 393b and 394 are reproduction amplifiers.
In addition, the same reference numerals as those in FIG. 1 indicate the same things.

The identification signal detection circuit 353 is used for the magnetic head 2
The reproduction signal is reproduced by 04, and the output signal amplified by the reproduction amplifier 394 is received, and an identification signal indicating whether the signal recorded on the magnetic tape 210 is an analog image signal or a digital image signal is detected. Then, the detected identification signal is output to the analog / digital discrimination circuit 351 and the digital recording mode discrimination circuit 352.

The analog / digital discrimination circuit 351 is
Upon receiving the identification signal from the identification signal detection circuit 353, it is determined whether the signal recorded on the magnetic tape 210 is an analog image signal or a digital image signal. Then, by the output control signal CP1, the changeover switches 381, 38
2, 373a and 383b are controlled to switch the processing system of the reproduced signal.

First, the operation at the time of reproducing the analog image signal will be described.

As described above, when the analog / digital discrimination circuit 351 discriminates the signal recorded on the magnetic tape 210 from the analog image signal, the magnetic head 20
The signal SP1 reproduced by 1a and 201b and amplified by the reproduction amplifier 391 is input to the analog image reproduction signal processing circuit 310 through the changeover switch 381, and the reverse processing of the analog image recording signal processing circuit 110 is performed, The original baseband analog image signal is output from the output terminal 301.

On the other hand, the signal SP2 reproduced by the magnetic heads 202a and 202b and amplified by the reproduction amplifier 392.
Is supplied to the analog audio reproduction signal processing circuit 320 via the changeover switch 382, converted into the original analog audio signal, and output from the output terminal 302.

Next, the operation at the time of reproducing the digital image signal will be described.

When the analog / digital discriminating circuit 351 discriminates the signal recorded on the magnetic tape 210 as a digital image signal, the output control signal CP1 turns on the switching switches 183a and 183b to turn on the magnetic heads 203a and 203b. The signals SP3a and SP3b of the two systems reproduced by 203c and 203d and amplified by the reproduction amplifiers 393a and 393b are input to the digital reproduction signal processing circuit 330 through the changeover switches 383a and 383b, respectively.

At this time, the digital recording mode discriminator 3
52 receives the identification signal from the identification signal detection circuit 353, determines the recording mode, and outputs the control signal CP2.
The servo circuit 220 receives the control signal CP2, controls the rotation speed R of the rotary drum 200 to a constant rotation speed R1, and switches the running speed V of the magnetic tape 210 according to the recording mode.

FIG. 10 shows a digital reproduction signal processing circuit 33.
3 is a block diagram showing a configuration example of 0, 331 is a demodulation circuit, 332 is a block reproduction circuit, 333 is a storage circuit, 3
34 is an error correction circuit, 335 is a reproduction signal output circuit, 33
6 is a timing circuit. Here, the input reproduction signals SP3a and SP3b are respectively equalized, code-identified and demodulated in the demodulation circuit 331, and then input to the block reproduction circuit 332. The block reproduction circuit 332 detects the sync signal and the ID signal, and stores the reproduction data from the track number and the block number in the ID signal.
It is stored in a predetermined position of 33. The error correction circuit 334 corrects the error in the reproduced data using the parity stored in the storage circuit 333. Reproduction signal output circuit 33
In 5, the reproduction data after error correction stored in the storage circuit 333 is read and the original digital image and audio signal SS is output. At this time, the deinterleaving process is performed corresponding to the interleaving process on the recording side. The timing circuit 336 is used by the digital recording mode discriminator 3
Upon receiving the control signal CP2 from 52, the timings of the demodulation circuit 331, the block reproduction circuit 332, the storage circuit 333, the error correction circuit 334, and the reproduction signal output circuit 335 are controlled according to the recording mode.

The original digital image and audio signal SS reproduced and demodulated in this way is output from the output terminal 303.

As described above, according to this embodiment, the current analog TV signal and the digital compression coded HDT are used.
A plurality of digital information signals having different transmission rates, such as V signals and SDTV signals, can be selectively recorded on a common recording medium with a single head configuration and automatically discriminated and reproduced.

FIG. 11 is a block diagram showing another embodiment of the image signal recording apparatus according to the present invention. Here, 155 is an analog recording mode selection circuit, 185 is a switching switch,
Reference numeral 195 denotes a recording amplifier, and the same reference numerals as those in FIG. 1 denote the same components. The present embodiment is an example in which not only the digital image signal but also the analog image signal is provided with a multimode in addition to the embodiment shown in FIG. This operation will be described below.

In the figure, when the SP mode is selected by the analog recording mode selection circuit 155, the changeover switch 185 is controlled by the output control signal CR3, and the changeover switch 18 is set in the magnetic heads 201a and 201b.
1. Analog image recording signal S via recording amplifier 191
R1 is supplied. The analog voice recording signal SR2 and the analog image recording signal S are operated in the same manner as in the embodiment of FIG.
R1 is recorded.

On the other hand, the analog recording mode selection circuit 155
When the LP mode is selected by, the output control signal C
The changeover switch 185 is controlled by R3, and the analog image recording signal SR1 is supplied to the magnetic heads 205a and 205b via the changeover switch 181 and the recording amplifier 195 and recorded on the magnetic tape 210. The analog voice recording signal SR2 is the same as in the embodiment of FIG.
2, the magnetic heads 202a, 2a via the recording amplifier 192
02b and is recorded in the deep magnetic layer portion of the magnetic tape 210 prior to the recording of the analog image recording signal SR1.

At this time, the servo circuit 220 sets the rotation speed R of the rotary drum 200 to the first rotation speed R1 which is the same as in the SP mode, and sets the running speed V of the magnetic tape 210 to 1 / M (1 / M () of the first running speed V1. M is an integer of 2 or more, for example,
3) and long time recording of M times is achieved. Since the track pitch Tp 'is naturally Tp / M (for example, 58/3 = 19.3 μm), the head widths of the magnetic heads 205a and 205b are, for example, 25 to 30 μm. It is said that

FIG. 12 is a block diagram showing another embodiment of the image signal reproducing apparatus according to the present invention. Here, 355 is an analog recording mode discrimination circuit, 385 is a switching switch,
Reference numeral 395 is a reproducing amplifier, and other reference numerals that are the same as those in FIG. This embodiment is an example of a reproducing apparatus corresponding to the embodiment of the recording apparatus shown in FIG. This operation will be described below.

The analog recording mode discrimination circuit 355 discriminates whether the recording mode is the SP mode or the LP mode, for example, by the control signal reproduced from the control track of the magnetic tape 210, and controls the changeover switch 385 by the output control signal CP3. To do.

Here, the analog recording mode discrimination circuit 35
5 determines that the recording mode is the SP mode, the signal SP1 reproduced by the magnetic heads 201a and 201b and amplified by the reproduction amplifier 391 is changed over to the changeover switch 38.
5, 381 through the analog image reproduction signal processing circuit 31
It is input to 0 and is restored to the original analog image signal.

On the other hand, the analog recording mode discrimination circuit 355.
When the recording mode is determined to be the LP mode by the, the analog image signal is reproduced by the magnetic heads 205a and 205b, amplified by the reproducing amplifier 391, and then the changeover switch 3
Analog image reproduction signal processing circuit 3 via 85, 381
10 and is restored to the original analog image signal.
The audio signal reproduction processing is the same as that of the embodiment of FIG. 9 in both SP mode and LP mode.

As described above, according to the embodiments shown in FIGS. 11 and 12, it is possible to realize a recording and / or reproducing apparatus which supports not only digital image signals but also analog image signals in multimode.

FIG. 13 is a block diagram showing still another embodiment of the image signal recording apparatus according to the present invention. This embodiment is an example in which the recording mode of the digital image signal is limited in the embodiment shown in FIG. 11, that is, the highest speed mode, for example, the recording mode of the wideband HD image signal is deleted. This operation will be described below.

The digital recording mode selection circuit 152
For example, a medium speed mode or a low speed mode is selected according to the transmission rates of the input digital image and audio signals.
The digital recording signal processing circuit 130 performs the above-described processing on the input digital image and audio signals,
Control signal C from digital recording mode selection circuit 152
When R2 is received, time axis processing is performed. Here, when the medium speed mode is selected, the recording signals SR3a and SR3b at the timings shown in FIGS. 4D and 4E are output, while
When the low speed mode is selected, the recording signals SR3a and SR3b at the timings shown in FIGS. 4F and 4G are output. Thereafter, the rotary drum 200 is operated in the same manner as in FIG.
2 or 4 rotations of 4 tracks of azimuth recording.

FIG. 14 is a block diagram showing still another embodiment of the image signal reproducing apparatus according to the present invention. This is an example of the reproducing apparatus corresponding to the embodiment of the recording apparatus in which the recording mode of the digital image signal shown in FIG. 13 is limited to the medium speed or lower, and its operation is the medium speed in the embodiment shown in FIG. It is similar to the operation in the following modes.

As described above, as shown in the embodiments shown in FIGS. 13 and 14, as a recordable digital image signal,
If the high-speed HD image signal is excluded and only the SD image signal of medium speed or lower is limited, the magnetic heads 203c and 203d are unnecessary, and the number of magnetic heads for digital image signals can be reduced, and recording and / or reproduction can be performed. The device can be simplified and the cost can be reduced.

In the above embodiments, an example in which the present invention is applied to a home-use analog VTR using an oxide tape having a width of 1/2 inch has been described, but the present invention is not limited to this. It can also be applied to home-use analog VTRs using 8 mm wide metal tape.

15 and 16 are block diagrams showing still another embodiment of the image signal recording and reproducing apparatus according to the present invention applied to the VTR using the 8 mm tape. Here, the point different from the embodiments shown in FIGS. 1 and 9 is that the analog audio signal is frequency-multiplexed with the analog image signal and recorded on the same track in the part relating to the recording and reproduction of the analog image signal. That is, the analog audio signal recording / reproducing magnetic heads 202a and 202b are removed, and the adding circuit 1 for adding the analog image signal and the analog audio signal is added.
71 is added to the recording system, and a separation circuit 371 for separating them is added to the reproduction system.

On the other hand, in the portion relating to the recording / reproduction of the digital image signal, the identification signal generated by the identification signal generating circuit 153 is directly recorded by the magnetic head 204. Since a VTR using an 8 mm tape does not have a control track like a VTR using a 1/2 inch tape, it is recorded here on, for example, a linear track for analog audio prepared as an option. During playback,
The signal from this linear track is used as an identification signal detection circuit 35.
At 3, the identification signal is detected. The following operation is as described above.

In the VTR using this 8 mm tape, tracking is performed by a pilot signal frequency-multiplexed with an analog image signal. In the present embodiment, this portion is not particularly shown, but it goes without saying that similar pilot signals are multiplexed and recorded even when recording a digital image signal. The tracking method at the time of recording the digital image signal does not necessarily have to be the same as that at the time of recording the analog image signal. Is planned.

By the way, in the above embodiments, the NTSC of 525 lines / 60 fields is used as the analog image signal.
Although the example of the signal has been described, the present invention is not limited to this, and it is needless to say that the present invention can be applied to, for example, an analog image signal of 625 lines / 50 fields. Further, the rotational speed R of the rotary drum 200 is the same when recording the analog image signal and when recording the digital image signal, but the present invention is not limited to this.

For example, the rotation speed R of the rotary drum 200 at the time of recording the analog image signal of 625 lines / 50 fields is set to 25 rps, which is the same as the frame frequency. However, the rotation speed R of the rotary drum 200 at the time of recording a digital image signal is not always the same as 25 rp.
It does not have to be s. Rather, in the sense that the recording wavelength is made as long as possible, the rotary drum 2 at the time of recording a digital image signal
The rotation speed R of 00 is 30 rps, which is the same as that at the time of NTSC signal.
It is better to set to. By doing so, the recording format of the digital image signal can be standardized all over the world.

[0071]

As described above, according to the present invention,
It is possible to record and reproduce a digital compression-coded image signal on a common recording medium while ensuring compatibility with the existing analog VTR. Furthermore, the transmission rate of the digital image signals that can be recorded can be made variable, so that a wideband HDTV
It is possible to record and reproduce a wide range of digital image signals from signals or SDTV signals of a plurality of programs to SDTV signals of one program on a common recording medium with a single head configuration.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an image signal recording device according to the present invention.

FIG. 2 is a diagram showing an example of recording frequency spectra of an analog image signal and an analog audio signal.

FIG. 3 is a diagram showing a track pattern on a magnetic tape when an analog image signal is recorded.

FIG. 4 is a waveform chart showing an example of a relationship between drum rotation and timing of a digital image recording signal.

FIG. 5 is a diagram showing a track pattern on a magnetic tape when a digital image signal is recorded.

FIG. 6 is a block diagram showing a configuration example of a digital recording signal processing circuit according to the present invention.

FIG. 7 is a diagram showing an example of a block configuration of a signal that has been subjected to four matching processing by a digital recording signal processing circuit.

FIG. 8 is a diagram showing a configuration example of an ID signal.

FIG. 9 is a block diagram showing an embodiment of an image signal reproducing device according to the present invention.

FIG. 10 is a block diagram showing a configuration example of a digital reproduction signal processing circuit according to the present invention.

FIG. 11 is a block diagram showing another embodiment of the image signal recording apparatus according to the present invention.

FIG. 12 is a block diagram showing another embodiment of the image signal reproducing apparatus according to the present invention.

FIG. 13 is a block diagram showing still another embodiment of the image signal recording device according to the present invention.

FIG. 14 is a block diagram showing still another embodiment of the image signal reproducing device according to the present invention.

FIG. 15 is a block diagram showing still another embodiment of the image signal recording device according to the present invention.

FIG. 16 is a block diagram showing still another embodiment of the image signal reproducing device according to the present invention.

[Explanation of symbols]

110 ... Analog image recording signal processing circuit, 120 ... Analog audio recording signal processing circuit, 130 ... Digital image and audio recording signal processing circuit, 151 ... Analog / digital selection circuit, 152 ... Digital recording mode selection circuit,
153 ... Identification signal generation circuit, 155 ... Analog recording mode selection circuit, 181-185 ... Changeover switch, 200 ...
Rotating drum, 201a to 205b ... Magnetic head, 210
... magnetic tape, 220 ... servo circuit, 310 ... analog image reproduction signal processing circuit, 330 ... analog audio reproduction signal processing circuit, 330 ... digital image and audio reproduction signal processing circuit, 351 ... analog / digital discrimination circuit, 35
2 ... Digital recording mode discrimination circuit, 353 ... Identification signal detection circuit, 355 ... Analog recording mode discrimination circuit, 38
1-385 ... Changeover switch.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location G11B 20/10 301 Z 7736-5D (72) Inventor Takao Arai 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Bachi Stock Company, Hitachi, Ltd.

Claims (24)

[Claims] 1. A first and a second rotary drum which are opposed to each other by 180 degrees.
First and second magnetic heads that are mounted at positions 1 and 2 and that have first and second azimuth angles of opposite polarities and record analog image signals on predetermined tracks formed in a diagonal direction on the magnetic tape. A digital information recording signal processing means for formatting and modulating the digital information signal and converting it into two-channel first and second digital recording signals; and a digital information recording signal processing means mounted in close proximity to a third position of the rotary drum. ,
A third recording circuit having third and fourth azimuth angles having opposite polarities and recording the first and second digital recording signals on two adjacent tracks formed on the magnetic tape in an oblique direction. A fourth magnetic head, servo means for controlling the rotational speed of the rotary drum and the running speed of the magnetic tape, and whether the signal recorded on the magnetic tape is the analog image signal,
Alternatively, when the analog image signal is recorded, the servo means receives the output signal of the analog / digital selecting means, and the analog / digital selecting means for selecting the digital information signal is selected. When rotating the magnetic tape at a first running speed and recording the digital information signal, the servo means receives the output signal of the analog / digital selection means, An image signal recording apparatus characterized in that a rotating drum is rotated at a second rotation speed and the magnetic tape is made to run at a second running speed. 2. A first drum and a second drum which are opposite to each other by 180 degrees on a rotary drum.
First and second magnetic heads that are mounted at positions 1 and 2 and that have first and second azimuth angles of opposite polarities and record analog image signals on predetermined tracks formed in a diagonal direction on the magnetic tape. A digital information recording signal processing means for formatting and modulating the digital information signal and converting it into two-channel first and second digital recording signals; and a digital information recording signal processing means mounted in close proximity to a third position of the rotary drum. ,
A third recording circuit having third and fourth azimuth angles having opposite polarities and recording the first and second digital recording signals on two adjacent tracks formed on the magnetic tape in an oblique direction. A fourth magnetic head, servo means for controlling the rotational speed of the rotary drum and the running speed of the magnetic tape, and whether the signal recorded on the magnetic tape is the analog image signal,
Alternatively, analog / digital selecting means for selecting the digital information signal, and whether the signal recorded on the magnetic tape is the analog image signal,
Alternatively, an identification signal generating means for generating an identification signal indicating the digital information signal, a fifth magnetic head for recording the identification signal on a third track formed on the magnetic tape in the longitudinal direction, 5, an identification signal detecting means for detecting the identification signal from the signal reproduced by the magnetic head, and when recording the analog image signal, the servo means receives the output signal of the analog / digital selecting means. When the rotary drum is rotated at a first rotation speed, the magnetic tape is run at a first running speed, and the digital information signal is recorded and reproduced, the servo means selects the analog / digital selection signal. An image signal recording apparatus, characterized in that the rotating drum is rotated at a second rotation speed in response to an output signal of the means, and the magnetic tape is run at a second running speed. . 3. A first drum and a second drum which are opposite to each other by 180 degrees on the rotary drum.
First and second magnetic heads that are mounted at positions 1 and 2 and that have first and second azimuth angles of opposite polarities and record analog image signals on predetermined tracks formed in a diagonal direction on the magnetic tape. A third magnetic head for recording a control signal for tracking control on a linear track formed in a longitudinal direction on the magnetic tape; and a first and a second channel for formatting and modulating a digital information signal. A digital information recording signal processing means for converting into a digital recording signal No. 2 and a third position of the rotary drum, which are mounted in close proximity to each other,
A fourth recording device having third and fourth azimuth angles having opposite polarities and recording the first and second digital recording signals on two adjacent tracks formed on the magnetic tape in an oblique direction. A fifth magnetic head, servo means for controlling the rotational speed of the rotary drum and the running speed of the magnetic tape, and whether the signal recorded on the magnetic tape is the analog image signal,
Alternatively, analog / digital selecting means for selecting the digital information signal, and whether the signal recorded on the magnetic tape is the analog image signal,
Alternatively, an identification signal generating means for generating an identification signal indicating the digital information signal is provided, and when the analog image signal is recorded, the control signal is used as it is, or the identification signal is pulse-width modulated to obtain the linear signal. Recording on a track, the servo means receives the output signal of the analog / digital selecting means, rotates the rotating drum at a first rotation speed, runs the magnetic tape at a first running speed, and When an information signal is recorded, the control signal is pulse-width modulated with the identification signal and recorded on the linear track, and the servo means receives the output signal of the analog / digital selection means and controls the rotary drum. An image signal recording apparatus, characterized in that the magnetic tape is rotated at a second rotation speed so that the magnetic tape is run at a second running speed. 4. The method according to any one of claims 1 to 3, wherein the rotary drum is mounted at fourth and fifth positions opposite to each other by 180 degrees, and has fifth and sixth azimuth angles of opposite polarities, An image signal recording apparatus comprising: sixth and seventh magnetic heads for recording an analog audio signal in a deep magnetic layer portion of the predetermined track. 5. The third or third structure according to any one of claims 1 to 4, which is mounted adjacent to a sixth position of the rotating drum, which is opposed to the third position by 180 degrees, and has polarities opposite to each other. Eighth and ninth magnetic heads each having an azimuth angle of 4 and recording the first and second digital recording signals on two adjacent tracks formed on the magnetic tape in an oblique direction. An image signal recording device characterized by the above. 6. The digital information signal according to claim 1, wherein the digital information signal is a signal having a variable transmission rate, and the digital information recording signal processing means transmits the digital information signal having the variable transmission rate by maximum transmission. An image signal recording apparatus for converting into the first and second digital information recording signals of a predetermined recording rate determined from the rate. 7. The digital information recording signal processing according to claim 1, further comprising digital recording mode selection means for selecting a recording mode of the digital information signal, and when recording the digital information signal. The means receives the output signal of the digital recording mode selection means, time-compresses the digital information signal to 1 / N (N is an integer of 1 or more) in accordance with the recording mode, and outputs the first signal of a predetermined recording rate. 1,
The identification signal generating means converts the signal into a second digital information recording signal, and in addition to the signal indicating whether the signal to be recorded on the magnetic tape is the analog image signal or the digital information signal, the digital recording mode selecting means. Receiving the output signals of the analog / digital selection means and the digital recording mode selection means, and generating a signal indicating the recorded mode as the identification signal. Rotate at a rotation speed of 2,
An image signal recording apparatus, wherein the magnetic tape is made to run at 1 / N of the second running speed. 8. The image signal recording apparatus according to claim 1, wherein the digital information signal is a bit-compressed digital image signal and digital audio signal, respectively. 9. A first and a second rotary drum facing each other by 180 degrees.
Mounted on the magnetic tape, having first and second azimuth angles of opposite polarities, and reproducing analog image signals recorded on predetermined tracks diagonally formed on the magnetic tape. Magnetic head and a third position of the rotary drum, mounted in close proximity,
Third and fourth magnets having third and fourth azimuth angles of opposite polarities and reproducing digital information signals recorded on two adjacent tracks formed in an oblique direction on the magnetic tape. A head, servo means for controlling the rotational speed of the rotary drum and the running speed of the magnetic tape, and an analog / digital signal for discriminating whether the signal recorded on the magnetic tape is the analog image signal or the digital information signal. The analog image reproduction signal processing means for demodulating and deforming the signals of the two channels reproduced by the third and fourth magnetic heads and converting them to the original digital information signal; When reproducing a signal, the servo means receives the output signal of the analog / digital discrimination means and rotates the rotary drum at a first rotation speed. When the magnetic tape is run at the first running speed and the digital information signal is reproduced, the servo means receives the output signal of the analog / digital discriminating means, and the rotating drum moves to the second speed. An image signal reproducing apparatus characterized in that the magnetic tape is rotated at a rotation speed so that the magnetic tape is run at a second running speed. 10. A predetermined one formed on a magnetic tape in an oblique direction, which is attached at first and second positions opposite to each other by 180 degrees on the rotary drum, has first and second azimuth angles of mutually opposite polarities. First and second magnetic heads for reproducing the analog image signal recorded on the track, and the third position of the rotary drum, which are mounted in close proximity to each other.
Third and fourth magnets having third and fourth azimuth angles of opposite polarities and reproducing digital information signals recorded on two adjacent tracks formed in an oblique direction on the magnetic tape. A head, servo means for controlling the rotational speed of the rotary drum and the running speed of the magnetic tape, and a fifth means for reproducing an identification signal recorded on a third track formed in the longitudinal direction on the magnetic tape. A magnetic head, an identification signal detecting means for detecting the identification signal from the signal reproduced by the fifth magnetic head, and a signal recorded on the magnetic tape, which receives the identification signal and is the analog image signal, Alternatively, an analog / digital discriminating means for discriminating whether or not the digital information signal and a signal of two channels reproduced by the third and fourth magnetic heads are demodulated and deformed to obtain an original signal. Digital information reproduction signal processing means for converting into the digital information signal, and when reproducing the analog image signal, the servo means receives the output signal of the analog / digital discriminating means, When rotating the magnetic tape at a first running speed to reproduce the digital information signal, the servo means receives the output signal of the analog / digital discrimination means, An image signal reproducing apparatus characterized in that a rotating drum is rotated at a second rotation speed and the magnetic tape is made to run at a second running speed. 11. A predetermined unit formed on a magnetic tape in an oblique direction, the first and second azimuth angles being opposite to each other, the first and second azimuth angles being opposite to each other. First and second magnetic heads for reproducing analog image signals recorded on the tracks, and for reproducing control signals recorded on the linear tracks formed in the longitudinal direction on the magnetic tape for tracking control. A magnetic head 3 and a third position on the rotary drum in close proximity,
Fourth and fifth magnetic fields having third and fourth azimuth angles of opposite polarities and reproducing digital information signals recorded on two adjacent tracks formed on the magnetic tape in an oblique direction. A head; servo means for controlling the rotation speed of the rotary drum and running speed of the magnetic tape; identification signal detection means for detecting an identification signal from the control signal reproduced by the third magnetic head; Analog / digital discriminating means for discriminating whether the signal recorded on the magnetic tape is the analog image signal or the digital information signal, and two channels reproduced by the fourth and fifth magnetic heads. And a digital information reproduction signal processing means for demodulating and deforming the above signal to convert it to the original digital information signal. , The servo means receives the output signal of the analog / digital discrimination means, rotates the rotary drum at a first rotation speed, and causes the magnetic tape to run at a first running speed, When reproducing the digital information signal, the servo means receives the output signal of the analog / digital discriminating means, rotates the rotating drum at a second rotation speed, and causes the magnetic tape to move at a second running speed. An image signal reproducing device characterized in that the image signal reproducing device is adapted to be driven by. 12. The method according to claim 9, wherein the rotary drum is attached at fourth and fifth positions opposite to each other by 180 degrees, and has fifth and sixth azimuth angles of opposite polarities, An image signal reproducing apparatus comprising sixth and seventh magnetic heads for reproducing analog audio signals recorded in a deep magnetic layer portion of the predetermined track. 13. The method according to claim 9, wherein the rotary drum is provided at a sixth position, which is opposite to the third position by 180 degrees, in proximity to the third position, and the third and third polarities have opposite polarities. An eighth and a ninth magnetic head having an azimuth angle of 4 and reproducing the digital information signals recorded in two adjacent tracks formed in an oblique direction on the magnetic tape. Image signal reproducing device. 14. The digital information reproduction signal processing means according to any one of claims 9 to 13, wherein the digital information reproduction signal processing means demodulates and deforms the reproduced two-channel signal having a constant rate to obtain the digital signal having the original variable transmission rate. An image signal reproducing device characterized by converting into an information signal. 15. The digital recording mode discriminating means according to claim 9, further comprising digital recording mode discriminating means for receiving the detected identification signal and discriminating a recording mode of the digital information signal recorded on the magnetic tape. When reproducing the information signal, the identification signal detection means detects the signal indicating whether the signal recorded on the magnetic tape is the analog image signal or the digital information signal, and the analog / digital discrimination means. To the digital recording mode discriminating means, the servo means receives the output signals of the analog / digital discriminating means and the digital recording mode discriminating means, and outputs the signal to the digital recording mode discriminating means. Rotating the rotating drum at the second rotation speed,
1 / N (N is 1) of the second traveling speed of the magnetic tape
The digital information reproduction signal processing means demodulates and deforms the reproduced two-channel signal having a constant rate, expands the time axis N times, and restores the original digital information signal. An image signal reproducing device characterized by being reproduced. 16. The image signal reproducing apparatus according to claim 9, wherein the digital information signal is a bit-compressed digital image signal and digital audio signal, respectively. 17. An analog image signal is attached to a magnetic tape in an oblique direction on the magnetic tape, the first and second azimuth angles being opposite to each other and being attached to the first and second positions opposite to each other by 180 degrees. First and second magnetic heads for recording and reproducing on a predetermined track formed, and a digital information recording signal for converting a digital information signal into a first and a second digital recording signal of two channels by formatting and modulation processing. A processing means, mounted in close proximity to a third position of the rotating drum,
Having the third and fourth azimuth angles of opposite polarities, the first and second digital recording signals are respectively recorded and reproduced on two adjacent tracks formed on the magnetic tape in an oblique direction. Third and fourth magnetic heads, servo means for controlling the rotational speed of the rotary drum and the running speed of the magnetic tape, and whether the signal recorded on the magnetic tape is the analog image signal,
Alternatively, analog / digital selecting means for selecting the digital information signal, analog / digital judging means for judging whether the signal recorded on the magnetic tape is the analog image signal or the digital information signal, and the third, And a digital information reproduction signal processing means for demodulating and deforming the two-channel signal reproduced by the fourth magnetic head to convert it to the original digital information signal, and for recording and reproducing the analog image signal. The servo means receives an output signal of the analog / digital selection means or the analog / digital discrimination means,
When the rotary drum is rotated at a first rotation speed, the magnetic tape is run at a first running speed, and the digital information signal is recorded and reproduced, the servo means is the analog / digital selection means. Alternatively, receiving the output signal of the analog / digital discrimination means,
An image signal recording / reproducing apparatus characterized in that the rotating drum is rotated at a second rotation speed and the magnetic tape is made to run at a second running speed. 18. An analog image signal is attached to a magnetic tape in an oblique direction on the magnetic tape, the first and second azimuth angles being opposite to each other. First and second magnetic heads for recording and reproducing on a predetermined track formed, and a digital information recording signal for converting a digital information signal into a first and a second digital recording signal of two channels by formatting and modulation processing. A processing means, mounted in close proximity to a third position of the rotating drum,
Having the third and fourth azimuth angles of opposite polarities, the first and second digital recording signals are respectively recorded and reproduced on two adjacent tracks formed on the magnetic tape in an oblique direction. Third and fourth magnetic heads, servo means for controlling the rotational speed of the rotary drum and the running speed of the magnetic tape, and whether the signal recorded on the magnetic tape is the analog image signal,
Alternatively, analog / digital selecting means for selecting the digital information signal, and whether the signal recorded on the magnetic tape is the analog image signal,
Alternatively, identification signal generating means for generating an identification signal indicating the digital information signal, and a fifth magnetic head for recording and reproducing the identification signal on a third track formed in the longitudinal direction on the magnetic tape, Identification signal detecting means for detecting the identification signal from the signal reproduced by the fifth magnetic head, and the signal recorded on the magnetic tape upon receipt of the detected identification signal is the analog image signal or the digital information. Analog / digital discriminating means for discriminating whether the signal is a signal, and digital information reproducing signal processing for demodulating and deforming the two-channel signals reproduced by the third and fourth magnetic heads and converting them to the original digital information signal. Means for recording and reproducing the analog image signal, the servo means is the analog / digital selection means or Receives the output signal of the analog / digital discrimination means,
When the rotary drum is rotated at a first rotation speed, the magnetic tape is run at a first running speed, and the digital information signal is recorded and reproduced, the servo means is the analog / digital selection means. Alternatively, receiving the output signal of the analog / digital discrimination means,
An image signal recording / reproducing apparatus characterized in that the rotating drum is rotated at a second rotation speed and the magnetic tape is made to run at a second running speed. 19. An analog image signal is attached to a magnetic tape in an oblique direction on the magnetic tape, the first and second azimuth angles being opposite to each other. First and second magnetic heads for recording and reproducing on a predetermined track formed, and a third magnetic head for recording and reproducing a control signal for tracking control on a linear track formed in the longitudinal direction on the magnetic tape. A magnetic head, digital information recording signal processing means for formatting and modulating a digital information signal to convert it into two-channel first and second digital recording signals, and in close proximity to a third position of the rotary drum. Installed,
Having the third and fourth azimuth angles of opposite polarities, the first and second digital recording signals are respectively recorded and reproduced on two adjacent tracks formed on the magnetic tape in an oblique direction. Fourth and fifth magnetic heads, servo means for controlling the rotation speed of the rotary drum and the running speed of the magnetic tape, and whether the signal recorded on the magnetic tape is the analog image signal,
Alternatively, analog / digital selecting means for selecting the digital information signal, and whether the signal recorded on the magnetic tape is the analog image signal,
Alternatively, identification signal generating means for generating an identification signal indicating the digital information signal, identification signal detecting means for detecting the identification signal from the signal reproduced by the third magnetic head, and receiving the detected identification signal, An analog / digital discriminating means for discriminating whether the signal recorded on the magnetic tape is the analog image signal or the digital information signal, and demodulating the two-channel signals reproduced by the fourth and fifth magnetic heads. A digital information reproduction signal processing means for performing a reformatting process and converting it to the original digital information signal, and when recording and reproducing the analog image signal, the control signal as it is or the pulse width of the identification signal The data is modulated and recorded on the linear track, and the servo means is the analog / digital selection means or the analog / Receives an output signal of the digital determining means,
When the rotary drum is rotated at a first rotation speed, the magnetic tape is run at a first running speed, and the digital information signal is recorded and reproduced, the control signal is pulse width modulated by the identification signal. Then, the servo means receives the output signal of the analog / digital selecting means or the analog / digital discriminating means,
An image signal recording / reproducing apparatus characterized in that the rotating drum is rotated at a second rotation speed and the magnetic tape is made to run at a second running speed. 20. The method according to claim 17, wherein the rotating drum is attached at fourth and fifth positions opposed to each other by 180 degrees, and has fifth and sixth azimuth angles of opposite polarities, An image signal recording / reproducing apparatus comprising: sixth and seventh magnetic heads for recording and reproducing an analog audio signal in a deep magnetic layer portion of the predetermined track. 21. In any one of claims 17 to 20, said third and third polarities, which are attached in proximity to each other at a sixth position of said rotary drum, which is opposed to said third position by 180 degrees, and which have polarities opposite to each other. Eighth and ninth magnetic heads having an azimuth angle of 4 and recording and reproducing the first and second digital recording signals on two adjacent tracks formed on the magnetic tape in an oblique direction. An image signal recording / reproducing apparatus comprising: 22. The digital information signal according to claim 17, wherein the digital information signal is a variable transmission rate signal, and the digital information recording signal processing means transmits the digital information signal of the variable transmission rate by maximum transmission. The first and second digital information recording signals are converted into the first and second digital information recording signals of a predetermined recording rate determined by the rate, and the digital information reproduction signal processing means reproduces the first and second digital information recording signals of the predetermined recording rate. An image signal recording / reproducing apparatus, characterized in that the signal is demodulated and deformed to be converted into the original digital information signal having the variable transmission rate. 23. A digital recording mode selecting means for selecting a recording mode of the digital information signal, and the digital information recorded on the magnetic tape in response to the detected identification signal. A digital recording mode discriminating means for discriminating the recording mode of the signal, and in the case of recording the digital information signal, the digital information recording signal processing means receives the output signal of the digital recording mode selecting means, The digital information signal is time-axis compressed to 1 / N (N is an integer of 1 or more) according to the recording mode, and the first and
The identification signal generating means converts the signal into a second digital information recording signal, and in addition to the signal indicating whether the signal to be recorded on the magnetic tape is the analog image signal or the digital information signal, the digital recording mode selecting means. Receiving the output signal from the analog / digital selection means and the digital recording mode selection means, the servo means receives the output signal from the analog / digital selection means and the digital recording mode selection means, Rotate at a rotation speed of 2,
When the magnetic tape is run at 1 / N of the second running speed to reproduce the digital information signal, the identification signal detecting means determines whether the signal recorded on the magnetic tape is the analog image signal. Alternatively, the signal indicating the digital information signal is detected and output to the analog / digital discriminating means, and the signal indicating the recording mode is detected and output to the digital recording mode discriminating means. Receiving the output signals of the analog / digital discriminating means and the digital recording mode discriminating means, rotating the rotary drum at the second rotational speed,
The magnetic tape is run at 1 / N of the second running speed, and the digital information reproduction signal processing means demodulates and deforms the reproduced two-channel signals and expands the time axis N times. An image signal recording / reproducing apparatus characterized in that the original digital information signal is reproduced. 24. The image signal recording / reproducing apparatus according to claim 17, wherein the digital information signal is a bit-compressed digital image signal and digital audio signal, respectively.