JPH10255392A - Reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speedily and smoothly send a video signal to a monitor TV without making the user feel a sense of incongruity by discriminating whether recorded information is digital recording or analog recording even in the midst of reproduction at the time of reproducing a magnetic tape recorded with an analog signal and a digital information signal in coexistence. SOLUTION: When digital recording is changed into analog recording at a traveling speed V2 during reproduction, and hence when reproducing of an analog video signal is judged by a analog video signals detecting circuit 25 in the midst of the reproduction, a rotary drum 3 is rotated in synchronization with the SYNC signal, and an analog video signal changeover switch 24 and an analog sound signal changeover switch 34 are changed over to the side of 'A'. Consequently, the analog video and sound signals reproduced from the magnetic tape and processed by an analog video signal processing circuit 21 and an analog sound signal processing circuit 31 are outputted to the monitor TV 300.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus, and more particularly to a reproducing apparatus having both functions of reproducing analog video and audio signals and reproducing digital information signals.

[0002]

2. Description of the Related Art At present, home video and audio signal recording / reproducing devices include an analog VT using a magnetic tape.
R has been put to practical use.

On the other hand, practical use of digital TV broadcasting has been promoted as next-generation TV broadcasting. For example, analog video and audio signals are converted to MPEG (Moving Picture Experts Groove).
2. Description of the Related Art There has been known a system for performing high-efficiency digital compression encoding using an up) method and broadcasting through a satellite or a coaxial cable.

[0004] These digital broadcasting systems are described, for example, in Journal of the Institute of Television Engineers of Japan, Vol. 47, No. 4, 1993, pp. 486-503, "5.
Broadcast service image ".

[0005]

Recently, these digital TV broadcasts have been put to practical use and implemented in a form mixed with analog TV broadcasts. However, in a conventional analog VTR, these digital information signals are converted into digital signals. Recording and playback could not be performed as is. Therefore, a digital broadcast receiving unit, a magnetic recording / reproducing unit having a digital information signal recording / reproducing function and an analog video / audio signal recording / reproducing function, and having compatibility with the current analog VTR are provided. Magnetic recording / reproducing apparatuses capable of recording and reproducing digital compression-coded video and audio signals as digital signals have been developed.

In such a magnetic recording / reproducing apparatus, information recorded on a magnetic tape can be mixed in analog and digital. When reproducing such a magnetic tape, the information recorded on the magnetic tape is reproduced even during the reproduction. It is necessary to determine whether the information being recorded is digital recording or analog recording, and switch the reproducing operation of the apparatus appropriately.

An object of the present invention is to determine whether recorded information is digital recording or analog recording when reproducing a magnetic tape on which an analog signal and a digital information signal are recorded in a mixed manner. Another object of the present invention is to provide a reproducing apparatus capable of appropriately switching the reproducing operation of the apparatus.

[0008]

In order to achieve the above object, in a reproducing apparatus for selecting an analog signal and a digital information signal and reproducing the analog signal or the digital information signal from a recording medium on which the selected signal is recorded,
Reproducing means having a first mode for reproducing digital information signals and a second mode for reproducing analog signals, and recording signal discriminating means for detecting which of a digital information signal and an analog signal is recorded on the recording medium Digital signal processing means for processing the first digital information signal reproduced by the reproduction means to obtain a second digital information signal; and processing the first analog signal reproduced by the reproduction means to obtain a second digital information signal. Analog signal processing means for obtaining an analog signal of the second type, wherein when the signal recorded on the recording medium is switched from an analog signal to a digital information signal or from a digital information signal to an analog signal during reproduction, the recording signal discrimination is performed. Means for automatically switching the mode of said reproducing means.

[0009]

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

FIG. 1 is a block diagram showing an embodiment of a magnetic recording / reproducing apparatus according to the present invention. Here, 100 is a magnetic recording / reproducing unit, 1a, 1b, 2a, 2b are magnetic heads, 3 is a rotating drum, 4 is a magnetic tape, 5 and 6 are recording / reproducing changeover switches, 7, 8 are recording / reproducing amplifiers, 9, 1
0 is a digital-analog recording switch, 11
Is a digital signal processing circuit, 12 is a digital signal input terminal, 13 is a digital signal output terminal, 21 is an analog video signal processing circuit, 22, 23 and 24 are analog video signal changeover switches, 25 is an analog video signal detection circuit, 90 Is an on-screen display circuit, 26 and 28 are analog video signal input terminals, 27 is an analog video signal output terminal, 31 is an analog audio signal processing circuit, 32, 33, and 3
4 is an analog audio signal changeover switch, 35 and 37 are analog audio signal input terminals, 36 is an analog audio signal output terminal, 41 is a switching signal output terminal, 40 is a system control circuit, 50 is a servo circuit, and 60 is a tape type discriminating circuit. , 70 is a tape running speed discrimination circuit, 80 is an analog broadcast receiving tuner, 801 is an analog broadcast signal input terminal,
821 is an analog video signal output terminal, 831 is an analog audio signal output terminal, 200 is a digital broadcast receiving unit, 201 is a digital broadcast signal input terminal, 202 is a digital broadcast receiving tuner, 203 is a digital signal switching circuit, 204 is a decoder, 211 Is a digital signal output terminal, 212 is a digital signal input terminal, 221
Is an analog video signal output terminal, 231 is an analog audio signal output terminal, 241 is a switching signal input terminal, 300 is a monitor television, 321 is an analog video signal input terminal,
331 is an analog audio signal input terminal. Further, although not shown, there is a tape traveling mechanism for traveling by winding the magnetic tape 4 around the rotating drum 3.

First, the operation for recording a digital broadcast signal will be described.

The system control circuit 40 controls the control signal CRP.
1, the recording / reproduction changeover switches 5 and 6 are switched to the "R" side, and the digital-analog recording changeover switches 9 and 10 are switched to the "D" side by the control signal CAD1. Further, the servo signal 50 synchronizes the rotation speed of the rotary drum with R1 and the rotation phase with the reference signal SREF output from the digital signal processing circuit 11 by the control signal CM, and sets the running speed of the magnetic tape 4 at V2. Control.

A digital broadcast signal input to a digital broadcast signal input terminal 201 is demodulated into a digital signal by a digital broadcast receiving tuner 201, and the digital signal is transmitted to a digital signal output terminal 211 and an “R” signal of a digital signal switching circuit 203. Supplied to the side input terminal. The digital signal output from the digital signal output terminal 211 is output via the digital signal input terminal 12
The signal is input to the digital signal processing circuit 11. The input digital signal is subjected to transmission path coding processing such as addition of error correction code and modulation, etc., and is passed through a digital-analog recording switch 9, recording / reproducing amplifier 7, recording / reproducing switch 5, and a magnetic head 1a. And 1b are recorded on the magnetic tape 4. At this time, for example, the diameter of the rotating drum 3 is 62 mm, and the rotating speed R1 is 30 rps.
And the running speed V2 of the magnetic tape 4 is set to 16.67 mm / s.
Then, the pitch of the recording tracks recorded on the magnetic tape 4 is about 29 μm.

Further, when the system control circuit 40 controls the output of the digital signal switching circuit 203 to the “R” side via the switching signal output terminal 41 and the switching signal input terminal 241 by the control signal CRP2, the digital broadcast reception The output of the tuner 201 is input to the decoder 204 and is converted into analog video and audio signals. When the analog video signal changeover switch 24 and the analog audio signal changeover switch 34 are further controlled to the “D” side by the control signal CAD2, the analog video signals are output to the analog video signal output terminal 221, the analog video signal input terminal 26, Analog video signal switching circuit 24, on-screen display circuit 90, analog video signal output terminal 27
The analog audio signal is supplied to the analog video signal input terminal 321 of the monitor television 300 via the analog audio signal output terminal 231, the analog audio signal input terminal 35, the analog video signal switching circuit 34, and the analog audio signal output terminal. Monitor TV 300 via 36
Is supplied to the analog audio signal input terminal 331. This allows the user to view the digital broadcast program being recorded.
The control signal CT switches the analog video signal switch 23 and the analog audio signal switch 33 to the “Ti” side, and the control signal CS causes the analog video signal switch 22 and the analog audio signal switch 32 to receive analog broadcast. When switching to the tuner output and the digital-analog recording changeover switches 24 and 34 are switched to the “A” side by the control signal CAD2, during the recording of the digital broadcast,
It is also possible to view a program received by an analog broadcast receiving tuner.

Next, the operation for recording an analog video signal will be described.

The system control circuit 40 controls the control signal CRP.
1, the recording / reproduction changeover switches 5 and 6 are switched to the "R" side, and the digital-analog recording changeover switches 9 and 10 are switched to the "A" side by the control signal CAD1. Further, the servo circuit 50 synchronizes the rotation speed of the rotary drum with R2, the rotation phase with the reference signal SYNC output from the analog video signal processing circuit, and sets the running speed of the magnetic tape 4 at V1 by the control signal CM. Control.

Analog video signal input terminal 26 or 28
The analog video signal input to the analog video signal tuner 80 or the output signal from the analog video signal output 821 of the analog broadcast receiving tuner 80 is
Is selected by the control signal CS from the system control circuit 40, the recording signal processing is performed in the analog video signal processing circuit 21, and the digital-analog recording changeover switch 10, the recording / reproduction amplifier 8, the recording / reproduction changeover switch 6, and the magnetic head The data is recorded on the magnetic tape 4 by 2a and 2b. Similarly, the analog audio signal input to the analog audio signal input terminal 35 or 37 or the output signal from the analog audio signal output 831 of the analog broadcast receiving tuner 80 is output from the system control circuit 40 by the analog audio signal changeover switch 32. The recording signal processing is performed by the analog audio signal processing circuit 31, and the magnetic tapes are transferred by the magnetic heads 1a and 1b through the digital-analog recording switch 9, the recording / reproducing amplifier 7, and the recording / reproducing switch 5. 4 recorded. At this time, the recording audio signal is recorded on the deep layer of the magnetic tape 4 and the recording video signal is recorded on the surface layer of the magnetic tape 4. For example, the diameter of the rotating drum 3 is 62 mm, and the rotating speed R2 is 29.97.
rps, the running speed V1 of the magnetic tape 4 is set to 33.35 m.
Assuming m / s, the pitch of the recording tracks recorded on the magnetic tape 4 is about 58 μm. The magnetic tape 4
Is V3 = 11.12 mm / s, the pitch of the recording tracks recorded on the magnetic tape 4 is about 19
μm. Further, similarly to the case of recording a digital broadcast signal, it is possible to watch an analog broadcast program being recorded on the monitor television 300, and it is also possible to watch a digital broadcast program.

Next, the reproducing operation will be described. At the time of reproduction, it is determined whether a digital signal or an analog signal is recorded on the magnetic tape 4, and the operation mode of the servo circuit 50 and each switch are appropriately switched to output to the monitor television. Need to be drawn. Here, the material of the discrimination is the type of the magnetic tape, the running speed of the magnetic tape when a signal is recorded on the magnetic tape, and the presence or absence of an analog video signal in the reproduced signal.

First, during standby, the system control circuit 40
The recording / playback switch 5 is controlled by the control signal CRP1.
And 6 are switched to the “P” side, and by the control signal CT,
The analog video signal changeover switch 23 and the analog audio signal changeover switch 33 are switched to the "Ti" side, and the digital-analog recording changeover switches 24 and 34 are switched to the "A" side by the control signal CAD2. Therefore, during standby, the received video and audio signals of the analog broadcast are output to the monitor television 300.

FIG. 2 is a flowchart of the above-described discrimination operation at the start of reproduction. Hereinafter, description will be made in conjunction with FIG.

First, the type of the magnetic tape inserted into the tape running mechanism is determined by a tape type determining circuit 60. These discriminations are usually made using discrimination holes formed in the magnetic tape cassette. For example, a high-performance tape can perform both digital recording and analog recording, and a normal tape can only perform analog recording.

The determination of the tape type is performed immediately when the magnetic tape is inserted into the tape running mechanism, and immediately after that, the rotating drum 3 is rotated. Tape type discriminating circuit 6
In response to the result DT of “0”, if the system control circuit 40 is a magnetic tape capable of digital recording, the servo circuit 5
By 0, the rotation phase of the rotary drum 3 is synchronized with the reference signal SREF generated from the digital signal processing circuit 11. If the recording medium is a magnetic tape on which digital recording is not possible, the rotation phase of the rotating drum 3 is synchronized with the reference signal SYNC generated by the analog video signal processing circuit 21 and the apparatus stands by.

Next, when a reproduction start command is received, the magnetic tape inserted into the tape running mechanism is run, and the running speed of the magnetic tape when a signal is recorded on the magnetic tape is detected. The tape speed discrimination circuit 70, for example, first runs the magnetic tape 4 at a constant speed, counts the number of pulses of the control track output signal at that time, and detects the magnetic tape running speed during recording. The result is transmitted to the system control circuit 40 as a signal DV shown in FIG. 1, and the system control circuit 40 controls the servo circuit 50 by the control signal CM so that the servo circuit 50 runs at the magnetic tape running speed at the time of recording.

Here, assuming that the digital recording is performed only at the tape running speed V2 (16.67 mm / s), if it is determined that the recording is performed at the above-described tape speed V1 or V3, the magnetic tape is analog-recorded. Will be. In this case, the servo circuit 50 synchronizes the rotation phase of the rotating drum 3 with the reference signal SYNC generated by the analog video signal processing circuit 21. Thereafter, the system control circuit 40 switches the analog video signal changeover switch 23 and the analog audio signal changeover switch 33 to the “Ta” side, so that analog video and audio being reproduced can be viewed on the monitor television.

If it is determined that the recording is performed at the tape speed V2, the digital signal switching circuit 2
03 is controlled to the “P” side, and the system control circuit 40 switches the analog video signal switch 24 and the analog audio signal switch 34 to the “D” side. If the magnetic tape is digitally recorded, the reproduced digital signal is converted into an analog video and audio signal by the decoder 204 and can be viewed on a monitor television. Further, the system control circuit 40 switches the analog video signal switch 23 and the analog audio signal switch 33 to the “Ta” side. At this time, if the analog video signal detection circuit 25 detects the analog signal and detects the analog signal, the magnetic tape is recorded as an analog signal. In this case, the servo circuit 50 outputs the analog video signal. The rotation phase of the rotating drum 3 is synchronized with the reference signal SYNC generated by the processing circuit 21.
Thereafter, the system control circuit 40 switches the analog video signal changeover switch 24 and the analog audio signal changeover switch 34 to the “A” side, so that analog video and audio being reproduced can be viewed on the monitor television. If the analog video signal detection circuit 25 does not detect an analog signal, this magnetic tape is recorded digitally. In this case, the reproduced video and audio signals have already been output to the monitor television.
As a detection method of the analog video signal detection circuit 25, for example, there is a method of detecting whether or not a signal output from the analog video signal processing circuit includes a horizontal synchronization signal. As a detection method, for example, there is a method of measuring the number of pulses of the horizontal synchronization signal within a certain time.

With the above, a series of operations is completed. The tape speed discrimination circuit 70 and the analog video signal detection circuit 25
During the playback of a magnetic tape on which analog signals and digital information signals are recorded in a mixed manner, it is determined whether the information recorded on the magnetic tape is digital recording or analog recording. The determination is always made, and the reproducing operation of the apparatus is appropriately switched. The operation for this will be described later.

FIGS. 3 to 6 show the timing of the operation of the tape type discriminating circuit 60, the tape speed discriminating circuit 70, the analog video signal detecting circuit 25, the servo circuit 50, and the switches from the tape insertion to the start of the reproducing operation. FIG.

FIG. 3 shows an example in which a magnetic tape recorded digitally is inserted. Immediately before the magnetic tape is inserted, the monitor television 300 outputs the video and the audio received by the analog broadcast receiving tuner. When a magnetic tape is inserted, first, the tape type is detected. As a result, when it is determined that the tape is a digitally recordable tape, the rotating drum 3 is rotated in synchronization with the SREF. Next, when the reproduction is started, the tape speed detection starts. First, the tape is run at the tape running speed V1, the number of pulses of the control track output signal at that time is counted, and detected as V2, which is the magnetic tape running speed at the time of recording. When the tape speed detection is completed, the magnetic tape is caused to run at V2 as the detection result. After that, the analog video signal changeover switch 24 and the analog audio signal changeover switch 34 are switched to the “D” side. After the tape traveling speed is switched from V1 to the traveling speed V2, the tracking operation is completed, and the decoding by the decoder 204 is performed. Since it takes time from the start to the conversion output processing to analog video and audio, the timing of switching the analog video signal changeover switch 24 and the analog audio signal changeover switch 34 to the “D” side is delayed by a predetermined time.
This delay time can be obtained, for example, by measuring the time from the start of reproduction or receiving a signal to start decoding conversion output. When the analog video signal changeover switch 24 and the analog audio signal changeover switch 34 are switched to the “D” side, the monitor TV 30
To 0, the analog video and audio signals converted by the decoder 204 are output. Further, when the analog video signal changeover switch 23 and the analog audio signal changeover switch 33 are switched to “Ta” side, the analog video signal detection circuit 25 detects whether the input signal is an analog video signal. The switching timing at this time is also generated by, for example, a method of measuring time from the start of reproduction. Since the magnetic tape in this example has been digitally recorded, the analog video signal detection circuit 25 determines that it is not an analog video signal. Note that, in the case where digital recording and analog recording are mixed on one magnetic tape, the analog video signal detecting circuit 25 is used.
Continues the detection operation.

FIG. 4 shows an example in which a magnetic tape on which analog recording is performed at a tape speed different from the tape speed V2 of digital recording is inserted into a digitally recordable magnetic tape. Until the tape speed is detected, the same operation as in the above-described example is performed. However, if the magnetic tape traveling speed at the time of recording is detected as V1 or V3 as a result of the tape speed detection, there is no possibility that digital recording is performed in this case. , The rotary drum 3 is rotated in synchronization with the SYNC. Thereafter, when the analog video signal changeover switch 23 and the analog audio signal changeover switch 33 are switched to the “Ta” side while the analog video signal changeover switch 24 and the analog audio signal changeover switch 34 are set to the “A” side, the monitor television 300 The analog video and audio signals reproduced from the magnetic tape and processed by the analog video signal processing circuit 21 and the analog audio signal processing circuit 31 are output.

FIG. 5 shows an example in which a magnetic tape that cannot be digitally recorded is inserted. If it is determined that the tape is a digitally unrecordable tape as a result of the tape type detection, the rotation of the rotary drum 3 is started in synchronization with the SYNC, and the tape speed detection is started. The magnetic tape is run at the speed of the detection result, and thereafter, the analog video signal changeover switch 24 and the analog audio signal changeover switch 34
, The analog video signal switch 23 and the analog audio signal switch 33
Is switched to the “Ta” side, the monitor TV 30
To 0, analog video and audio signals reproduced from the magnetic tape and processed by the analog video signal processing circuit 21 and the analog audio signal processing circuit 31 are output. In this case, since it is known at the time of tape insertion that digital recording has not been performed on the inserted magnetic tape, the timing at which the analog video signal switch 23 and the analog audio signal switch 33 are switched to the “Ta” side is shortened. Output time to the monitor TV can be reduced.

FIG. 6 shows an example in which a magnetic tape that has been analog-recorded at a digital recording tape speed V2 is inserted into a digital-recordable magnetic tape. Immediately before the magnetic tape is inserted, the monitor television 300 outputs the video and the audio received by the analog broadcast receiving tuner. When the magnetic tape is inserted, first, the tape type is detected, and as a result, it is determined that the tape is a digital recordable tape.
And starts the next stage of tape speed detection. When the tape speed detection is completed, the magnetic tape is caused to run at V2 as the detection result. Thereafter, the analog video signal changeover switch 24 and the analog audio signal changeover switch 34 are switched to the “D” side. In this example, since no digital signal is input to the decoder 204, nothing can be viewed from the monitor television 300. Next, when the analog video signal changeover switch 23 and the analog audio signal changeover switch 33 are switched to the “Ta” side, the analog video signal detection circuit 25
Detects whether the input signal is an analog video signal. Since the analog recording is performed on the magnetic tape in this example, the analog video signal detection circuit 25 determines that the signal is an analog video signal, and sets the rotating drum 3 to the SY.
The rotation is performed so as to synchronize with the NC, and further, the analog video signal changeover switch 24 and the analog audio signal changeover switch 34 are switched to the “A” side, thereby completing a series of determination operations. As shown in the figure, the output of the monitor television is disturbed from the time when the reference signal of the rotating drum 3 is switched from SREF to SYNC to the time when synchronization is achieved. This is caused by the analog video signal switch 24 and the analog audio signal. This can be avoided by delaying the timing of switching the changeover switch 34 to the “A” side.

FIGS. 7 to 10 show the discrimination of the tape type when the digital tape changes from digital recording to analog recording or vice versa during reproduction of a magnetic tape on which analog signals and digital information signals are recorded in a mixed manner. Circuit 60,
Tape speed discrimination circuit 70, analog video signal detection circuit 2
FIG. 5 is a diagram showing operation timings of a servo circuit 50 and switches.

FIG. 7 shows that during playback, from digital recording,
This is an example of a case where the recording is changed to analog recording at the traveling speed V2. If the analog video signal detection circuit 25 determines that the analog video signal is to be reproduced during the reproduction,
It is rotated in synchronization with YNC, and the analog video signal switch 24 and the analog audio signal switch 34 are switched to the “A” side. As a result, analog video and audio signals reproduced from the magnetic tape and processed by the analog video signal processing circuit 21 and the analog audio signal processing circuit 31 are output to the monitor television 300.

FIG. 8 shows that during playback,
This is an example of a case where the recording is changed to analog recording at the traveling speed V1 or V3. When the analog video signal detection circuit 25 determines that an analog video signal is being reproduced during reproduction, and when the result of the tape speed discrimination circuit 70 detects that the traveling speed is V1 or V3, the magnetic tape is run at the discrimination speed, 3 is rotated in synchronization with the SYNC,
Further, the analog video signal changeover switch 24 and the analog audio signal changeover switch 34 are switched to the “A” side. As a result, the analog television signal processing circuit 21 reproduces the data from the magnetic tape on the monitor television 300.
The analog video and audio signals processed by the analog audio signal processing circuit 31 are output.

FIG. 9 shows an example of a case where the recording is changed from analog recording of the traveling speed V2 to digital recording during reproduction. When the analog video signal detection circuit 25 determines that there is no analog video signal reproduction during reproduction, the rotating drum 3 is rotated in synchronization with the SREF, and the analog video signal changeover switch 24 and the analog audio signal changeover switch 34 are set to “ Switch to "D" side. Thus, the analog video and audio signals processed by the decoder 204 are output to the monitor television 300.

FIG. 10 shows an example in which the recording is changed from analog recording of the traveling speed V1 or V3 to digital recording. When the analog video signal detection circuit 25 determines that there is no analog video signal reproduction during reproduction, and furthermore, when the result of the tape speed discrimination circuit 70 detects that the traveling speed is V2, the magnetic tape is run at the discrimination speed V2.
The rotary drum 3 is rotated in synchronization with the SREF, and the analog video signal switch 24 and the analog audio signal switch 34 are switched to the “D” side. Thus, the analog video and audio signals processed by the decoder 204 are output to the monitor television 300.

FIG. 11 shows an example in which analog recording of the traveling speed V1 or V3 is changed to analog recording of the traveling speed V2. In this case, the analog video signal detection circuit 25 does not change while the analog video signal is being reproduced.
When the result of the tape speed discrimination circuit 70 detects that the traveling speed is V2, the magnetic tape is simply run at the discrimination speed V2.

FIG. 12 is a block diagram showing a third embodiment of the magnetic recording / reproducing apparatus according to the present invention. In this example, the magnetic recording / reproducing unit 100 and the receiving unit 200 shown in FIG. 1 or FIG. In this case, there is no need for input / output terminals for each signal that travels between the two units described above.

[0039]

As described above, according to the present invention, when a magnetic tape on which an analog signal and a digital information signal are recorded in a mixed manner is reproduced, it is recorded even during the reproduction. Whether the information is digitally recorded
Alternatively, since it is determined whether the recording is analog recording, it is possible to appropriately switch the reproduction operation of the apparatus, and it is possible to smoothly switch the output without the user's discomfort.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a magnetic recording / reproducing apparatus according to the present invention.

FIG. 2 is an operation flowchart of a determination at the start of reproduction according to the present invention.

FIG. 3 is a diagram showing operation timing according to the present invention.

FIG. 4 is a diagram showing operation timings according to the present invention.

FIG. 5 is a diagram showing operation timing according to the present invention.

FIG. 6 is a diagram showing operation timing according to the present invention.

FIG. 7 is a diagram showing operation timings according to the present invention.

FIG. 8 is a diagram showing operation timing according to the present invention.

FIG. 9 is a diagram showing operation timing according to the present invention.

FIG. 10 is a diagram showing operation timings according to the present invention.

FIG. 11 is a diagram showing operation timing according to the present invention.

FIG. 12 is a block diagram showing another configuration example according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 100 ... Magnetic recording / reproducing unit, 1a, 1b, 2a, 2b ... Magnetic head, 3 ... Rotating drum, 4 ... Magnetic tape, 11 ... Digital signal processing circuit, 21 ... Analog video signal processing circuit, 22, 23, 24, 29 ... Analog video signal changeover switch, 25 ... Analog video signal detection circuit, 31 ... Analog audio signal processing circuit, 32, 33, 34 ... Analog audio signal changeover switch, 40 ... System control circuit, 50 ... Servo circuit, 60 ... Tape type Discrimination circuit, 70: tape traveling speed discrimination circuit, 200: receiving unit.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H04N 5/92 (72) Inventor Shigeru Takahashi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Pref.

Claims (10)

[Claims] 1. A reproducing apparatus for reproducing an analog signal or a digital information signal from a recording medium in which an analog signal and a digital information signal are selected and recording the selected signal. A reproducing unit having a second mode for reproducing an analog signal; a digital signal processing unit for processing a first digital information signal reproduced by the reproducing unit to obtain a second digital information signal; Analog signal processing means for processing the first analog signal reproduced in step 1 to obtain a second analog signal; and recording signal discriminating means for detecting whether a digital information signal or an analog signal is recorded on the recording medium. During playback, the signal recorded on the recording medium is changed from an analog signal to a digital information signal, or From Ijitaru information signal when switched to the analog signal, the recording signal by discrimination means, reproducing apparatus characterized by automatically switching the mode of the reproducing device. 2. The reproducing apparatus according to claim 1, wherein the recording signal discriminating means determines that the signal recorded on the recording medium has been switched from an analog signal to a digital information signal during reproduction. The first mode is selected for selection, and when it is determined that the signal recorded on the recording medium has been switched from a digital information signal to an analog signal, the reproducing means is selected for the second mode. Playback device. 3. A rotary drum on which a magnetic head is mounted, and a tape running mechanism on which the rotary drum is mounted, and a magnetic tape is wound around the rotary drum and run, wherein an analog signal and a digital information signal are selected. In a reproducing apparatus for reproducing an analog signal or a digital information signal in which a selected signal forms a predetermined track in a diagonal direction of the magnetic tape, a first mode for reproducing a digital information signal; Reproducing means having a second mode for reproducing; digital signal processing means for processing a first digital information signal reproduced by the magnetic head to obtain a second digital information signal; Analog signal processing means for processing one analog signal to obtain a second analog signal; Recording signal discriminating means for discriminating whether a digital information signal or an analog signal is recorded on the magnetic tape. During reproduction, the signal recorded on the magnetic tape is converted from an analog signal to a digital information signal or from a digital information signal to an analog signal. A reproducing apparatus, wherein the mode of the reproducing means is automatically switched by the recording signal determining means when the signal is switched to a signal. 4. The apparatus according to claim 3, wherein the recording signal discriminating means determines that the signal recorded on the magnetic tape has been switched from an analog signal to a digital information signal during reproduction. The first mode is selected for selection, and when it is determined that the signal recorded on the magnetic tape has been switched from a digital information signal to an analog signal, the reproducing means is selected for the second mode. Playback device. 5. A rotary drum on which a magnetic head is mounted, and a tape running mechanism on which the rotary drum is mounted, and a magnetic tape is wound around the rotary drum and run, wherein an analog signal and a digital information signal are selected. In a reproducing apparatus for reproducing an analog signal or a digital information signal recorded with the selected signal forming a predetermined track in an oblique direction of the magnetic tape, a first digital information signal reproduced by the magnetic head is processed. Digital signal processing means for obtaining a second digital information signal; analog signal processing means for processing a first analog signal reproduced by the magnetic head to obtain a second analog signal; Reproduction signal determination means for determining whether the reproduction signal is a digital information signal or an analog signal; In a first mode for reproducing a digital information signal, the rotation phase of the rotary drum is adjusted at least to a reference signal output from the digital signal processing means, and in a second mode for reproducing an analog signal, at least the analog signal is reproduced. Servo means for controlling the rotation phase of the rotating drum so that the rotation phase of the rotating drum is adjusted to the reference signal output from the signal processing means; and during the playback in the first mode, the playback signal discriminating means. When it is determined that the reproduction is switched to an analog signal, the servo unit is selected to the second mode. 6. A rotary drum on which a magnetic head is mounted, and a tape running mechanism on which the rotary drum is mounted and a magnetic tape is wound around the rotary drum and run, wherein an analog signal and a digital information signal are selected. In a reproducing apparatus for reproducing an analog signal or a digital information signal recorded with the selected signal forming a predetermined track in an oblique direction of the magnetic tape, a first digital information signal reproduced by the magnetic head is processed. Digital signal processing means for obtaining a second digital information signal; analog signal processing means for processing a first analog signal reproduced by the magnetic head to obtain a second analog signal; Tape running speed discriminating means for detecting a tape running speed at the time of recording; In the second mode, in which the rotation phase of the rotary drum is adjusted to at least the reference signal output from the digital signal processing means and the analog signal is reproduced, the reference mode output from the analog signal processing means is at least used. Servo means for controlling the rotation phase of the rotating drum so as to match the rotation phase of the rotating drum with the signal. During playback in the first mode, a digital information signal is recorded by the tape traveling speed determination means. A reproducing apparatus characterized in that when it is determined that recording has been switched to a speed at which recording is not likely to be performed, the servo means is selected to the second mode. 7. A rotary drum on which a magnetic head is mounted, and a tape running mechanism on which the rotary drum is mounted, and a magnetic tape is wound around the rotary drum and run, wherein an analog signal and a digital information signal are selected, In a reproducing apparatus for reproducing an analog signal or a digital information signal recorded with the selected signal forming a predetermined track in an oblique direction of the magnetic tape, a first digital information signal reproduced by the magnetic head is processed. Digital signal processing means for obtaining a second digital information signal; analog signal processing means for processing a first analog signal reproduced by the magnetic head to obtain a second analog signal; A tape type determining means for determining the tape running speed at the time of recording of the recorded magnetic tape; Speed discriminating means; reproducing signal discriminating means for discriminating whether the reproduced signal from the magnetic head is a digital information signal or an analog signal; and at least a first mode for reproducing the digital information signal. In a second mode in which the rotation phase of the rotary drum is adjusted to the reference signal output from the digital signal processing means and an analog signal is reproduced, at least the reference signal output from the analog signal processing means is set to the reference signal of the rotary drum. Servo means for controlling the rotation phase of the rotating drum so as to match the rotation phase, and control means for inputting the results of the tape type discrimination means, tape running speed discrimination means and reproduction signal discrimination means and controlling the servo means. A magnetic tape of a type in which a digital information signal may be recorded by the tape type determining means. It is in,
The tape traveling speed discriminating means has a speed at which a digital information signal may be recorded, and during reproduction in the second mode, the reproduction signal discriminating means reproduces data from the magnetic tape. A reproducing apparatus characterized in that when it is determined that the signal being switched from an analog signal to a digital information signal, the control means causes the servo means to select the first mode. 8. A reproducing apparatus according to claim 5, wherein said reproduction signal discriminating means detects a decoding synchronization signal of an analog signal reproduced by said magnetic head. 9. The reproducing apparatus according to claim 8, wherein said reproduction signal discriminating means detects a horizontal synchronizing signal of said decoded synchronizing signal. 10. The apparatus according to claim 5, further comprising a first magnetic head group for reproducing a digital information signal or an analog audio signal, and a second magnetic head group for reproducing an analog video signal. Characteristic playback device.