JPH0287362A - Information read-out and reproducing device - Google Patents

Abstract

PURPOSE:To appropriately read out and reproduce recorded information by supplying a data reproducing part with a readout output signal to be obtained from a signal readout part via a switching pair in accordance with the state of detecting output signal from a signal detecting part. CONSTITUTION:When a phase modulation signal is contained in the readout output signal RSa from the signal readout part 13, regenerative carriers C1 and C2 are formed based on the phase modulation signal in the readout output signal RSa and supplied to a data reproducing part (PSK sound signal reproducing part) 20, while prescribed detecting signal LP, LL and LR are obtained from the signal detecting parts (level detectors) 44-46, and the readout output signal RSa obtained from the signal readout part 13 is automatically supplied to the data reproducing part 20 via the switching parts 19 and 31. Then, when the phase modulation signal is not contained in the readout output signal RSa, the readout output signal RSa is automatically supplied to an information reproducing part (PSK demodulation part) 27 via the switching parts 19 and 31. By this method, the recorded information can appropriately be read out and reproduced.

Description

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

Industrial Application Field Overview of the Invention Conventional Technology Problems to be Solved by the Invention Means for Solving the Problems Action Embodiment Configuration and Operation (Fig. 1, Fig. 3, Fig. 4) G-2 System Controller Control operation (Fig. 2) G-3 Modification H Effect of the invention A Industrial application field The present invention provides a phase modulated signal obtained by phase modulating a carrier signal of a first frequency with digital data, and
A read output signal obtained through a signal reading section from a recording medium on which one or both of the other modulated signals obtained by modulating the carrier wave signal of the second frequency with the information signal is read by the data reproducing section or the information signal. The present invention relates to an information reading and reproducing device that supplies reproduced digital data or reproduced information signals to a reproducing section.

B. Summary of the Invention The present invention provides a phase modulated signal obtained by phase modulating a carrier signal of a first frequency with digital data, and
A phase modulated signal and other modulated signals obtained by modulating a carrier wave signal of a second frequency different from the first frequency with an information signal from a recording medium such as a magnetic tape on which one or both of the other modulated signals are recorded. One or both of the modulated signals are read by a signal reading means such as a magnetic head, and the obtained read output signal is demodulated and other processing is performed on the phase modulated signal read from the recording medium to generate reproduced digital data. and an information reproducing section that performs demodulation and other processing on other modulated signals read from the recording medium to obtain reproduced information signals, thereby reproducing digital data or In an information reading and reproducing device that obtains a reproduced information signal, when a read output signal obtained from a signal reading section includes a phase modulation signal, a carrier wave that reproduces a carrier signal based on the phase modulation signal and supplies it to the data reproducing section. A signal detecting section is provided to detect a signal component corresponding to the reproduced carrier signal obtained from the signal forming section or a signal component corresponding to a signal obtained by frequency-multiplying the signal, and a detection output signal obtained from the signal detecting section is provided. The read output signal obtained from the signal reading section is supplied to the data reproducing section according to the state of the read output signal obtained from the recording medium. A state is automatically obtained in which appropriate demodulation and other processing are performed accordingly.

C. Prior Art A video tape recorder (VTR) is used to record video signals such as color video signals and audio signals on magnetic tape, and to reproduce each signal from the magnetic tape on which the video signals and audio signals are recorded. ), video signals are recorded and played back on magnetic tape as low frequency converted color signals and frequency modulated luminance signals, and in order to improve the quality of reproduced audio, audio signals are converted into frequency modulated signals and recorded on magnetic tape in the recording system. It has been proposed that an audio signal is recorded on a magnetic tape and that a reproduction system demodulates an audio signal converted into a frequency modulated signal from a magnetic tape to obtain a reproduced audio signal. In such a case, when an audio signal is converted into a frequency modulated signal and recorded on a magnetic tape, for example, a left signal component and a right signal component forming a stereo audio signal are
Two carrier signals (carriers) with different frequencies
are frequency modulated, respectively, and the left frequency modulated audio signal (left A
FM signal) and a right frequency modulated audio signal (right AFM signal). At that time, for the left AFM signal and the right AFM signal, for example, the frequency f is plotted on the horizontal axis, and the level L is plotted on the vertical axis.
In the frequency spectrum shown in FIG. 3, which is shown in FIG. The carrier frequency is, for example, about 1°3Ml1z and about 1.7MHz.

Another method for improving the quality of reproduced audio is to digitize the audio signal and record it on a magnetic tape in the recording system, and to reproduce the digitized audio signal from the magnetic tape in the reproducing system. It has also been proposed to perform digital/analog conversion to obtain a reproduced audio signal. In such a case, when an audio signal is digitized and recorded on a magnetic tape, for example, the audio signal is converted into digital data, that is, audio PCM digital data, based on pulse code modulation (PCM). With the audio PCM digital data,
Four-phase phase modulation (
4-PSK) method is performed to produce audio 4-PSK.
A signal is formed. At this time, the audio 4-PSK signal is represented by AP in the frequency spectrum shown in FIG. 4, where the horizontal axis represents the frequency f and the vertical axis represents the level L. It is arranged in a band between the frequency band CC of the low-pass conversion color signal and the frequency band FY of the frequency modulated audio signal, and its carrier frequency is set to 2.
MHz.

A frequency modulated audio signal (AFM signal) including such a left AFM signal and a right AFM signal, or audio 4-PS
For example, the K signal is recorded on the magnetic tape by a rotating magnetic head (17N) that is separate from the rotating magnetic head used for recording the video signal, and has the same recording rack as the video signal. Each formed recording trunk records a video signal on its surface layer, and an AFM signal or an audio 1-PSK signal on its deeper layer.
Alternatively, it is assumed that both the AFM signal and the audio 4-PSK signal are recorded.

In this way, when a 65f tape on which a video signal and one or both of an AFM signal and an audio 4PSK signal are recorded on a common recording track is used for information reproduction, the recorded video signal and the AFM signal are recorded on a common recording track. M signal and audio 4
- One or both of the PSK signals are read by separately provided rotating magnetic heads for video signals and rotating magnetic heads for audio signals. The read video signal from the rotary magnetic head for video signals is supplied to a video signal reproduction processing system and subjected to necessary processing, and the read AFM from the rotary magnetic head for audio signals is supplied to the video signal reproduction processing system.
One or both of the signal and the read audio 4-PSK signal are supplied to an audio signal reproduction processing system.

D. Problems to be Solved by the Invention In order to obtain a reproduced audio signal based on the AFM signal or the audio 4-PSK signal read from the magnetic tape as described above, the audio signal reproduction processing system in the VTR must: A component that forms an AFM audio signal reproducing section that performs demodulation and other processing on the read AFM signal from the rotary magnetic head for audio signals to obtain a reproduced audio signal, or a read audio 4- from the rotary magnetic head for audio signals. P.S.
It is necessary to form a PSK audio signal reproducing unit that performs demodulation and other processing on the K signal to obtain a reproduced audio signal, but the AFM audio signal reproducing unit and the PSK audio signal reproducing unit There is no mutual relationship between the two.

Therefore, in a VTR whose audio signal reproduction processing system forms an AFM audio signal reproduction section, it is not possible to obtain a reproduced audio signal based on the audio 4-PSK signal read from the magnetic tape, and the audio The signal reproduction processing system is PSK
In a VTR that forms a system audio signal reproduction section,
Since it is not possible to obtain a reproduced audio signal based on the AFM signal read from the magnetic tape, users of VTRs experience inconvenience.

Also, from the appearance of the magnetic tape, AFM signal and audio 4
- It is not possible to determine which of the PSK signals is recorded, or whether any of them are recorded, and the magnetic tape on which the AFM signal is recorded is processed for audio signal reproduction. The VTR system is configured to form an AFM audio signal reproducing section, and an audio 4-PS
A VT in which the audio signal reproduction processing system forms a PSK audio signal reproduction section for the magnetic tape on which the K signal is recorded.
In order to properly attach each to R, preparation or operation is required.

In view of the above, the present invention provides a signal reproduction processing system for audio 4
- A first reproducing section that performs demodulation and other processing on a phase modulated signal such as a PSK signal to obtain a reproduced output, and a first reproducing section that performs demodulation and other processing on another modulated signal such as an AFM signal and obtains a reproduced output. and a second reproducing section that obtains reproduction information based on the phase modulated signal read by the signal reading section from the recording medium and another modulated signal read from the recording medium by the signal reading section. An appropriate operation in which the read output signal obtained from the signal reading section is selectively supplied to the first playback section and the second playback section depending on the content thereof. It is an object of the present invention to provide an information reading and reproducing device in which the information is automatically read and reproduced.

E Means for Solving the Problems In order to achieve the above-mentioned object, the information reading and reproducing device according to the present invention uses a phase modulated signal obtained by phase modulating a carrier having a first frequency with digital data, and
A phase modulation signal and other modulation signals are obtained from a recording medium in which one or both of the other modulation signals obtained by modulating a carrier having a second frequency different from the first frequency with an information signal are recorded. a signal reading unit that obtains a read output signal by reading one or both of the signals; a data reproducing unit that performs demodulation and other processing on the phase modulation signal read from the recording medium to obtain reproduced digital data; an information reproducing section that performs demodulation and other processing on other modulated signals read from the medium to obtain a reproduced information signal; and a data reproducing section and an information reproducing section each of which receives a read output signal obtained from the signal reading section. When a phase modulation signal is included in the read output signal obtained from the switching section and the signal reading section, a carrier based on the phase modulation signal is regenerated to obtain a regenerated carrier, which is then sent to the data reproducing section. and a signal detecting section for detecting a signal component corresponding to the reproduced carrier obtained from the carrier forming section or a signal component corresponding to a signal obtained by frequency-multiplying the carrier forming section; An operation control section is provided for causing the switching section to take a state in which the read output signal obtained from the signal reading section is supplied to the data reproducing section, depending on the state of the detection output signal obtained from the signal detection section.

F Effect In the information reading and reproducing apparatus according to the present invention, when a phase modulation signal is included in the read output signal obtained from the signal reading section that reads either or both of the phase modulation signal and other modulation signals from the recording medium, Except for special cases where a reproduction mode is specified, a carrier forming section forms a reproduction carrier based on the phase modulation signal in the read output signal and supplies it to the data reproduction section, and a predetermined detection output is generated from the signal detection section. As a result, a state is automatically established in which the read output signal obtained from the signal reading section is supplied to the data reproducing section via the switching section controlled by the operating side i1 [1 section. It will be done. In addition, if the read output signal obtained from the signal reading section does not include a phase modulation signal, or in special cases where the playback mode is specified, the read output signal obtained from the signal reading section will be transmitted to the operation control section. A state in which the information is supplied to the information reproducing section is automatically established via the switching section controlled by the information reproducing section.

Therefore, an appropriate operation is automatically performed in which the read output signal obtained from the signal reading section is selectively supplied to the data reproducing section and the information reproducing section according to its content, and the recording medium is placed in phase with it. Regardless of whether one or both of the modulation signal and other modulation signals are recorded, the recorded information will be properly read and reproduced.

G Example G-1 Configuration and operation (Figs. 1, 3, and 4) Fig. 1 shows an example of an information reading and reproducing device according to the present invention. The converted color signal and the frequency modulated luminance signal, and the audio signal is audio 4-PS.
K signal, or in the form of a left AFM signal and a right AFM signal, or in the form of an audio 4-PSK signal and both a left AFM signal and a right AFM signal, respectively, from a recorded magnetic tape. , each signal is read using a rotating magnetic head structure, and the operation is performed to reproduce a color video signal and an audio signal. , audio 4
- The respective frequency bands of the PSK signal and one or both of the left AFM signal and the right AFM signal are CCFY AP AFL and AFR in FIGS. 3 and 4.
It is set as shown with .

In the example shown in FIG. 1, one or both of a low-pass conversion color signal, a 1-frequency modulation luminance signal, an audio 4-PSK signal, and a left AFM signal and a right AFM signal were recorded. A low frequency conversion color signal and a frequency modulation luminance signal are read from the magnetic tape TP by the video signal rotating magnetic head section 11, and are derived as a read video signal R3n via a rotary transformer j2. The signal and one or both of the left AFM signal and the right AFM signal are read by the audio head unit 13, and the read audio 4-PSK signal Pa+ 0JI- is read via the rotary 1-lance 14. A reading audio signal R that includes the multiple person AFM signal FLa and the reading table AFM signal FRa, or both of them.
3a.

Read video signal R obtained from rotary 1-lance 12
3n is a video signal reproduction processing section 16 via a reproduction amplification section 15.
The signal is supplied to the video signal reproduction processing unit 16, where it is separated into a low frequency converted color signal and a frequency modulated luminance signal, and subjected to predetermined processing. Then, from the video signal reproduction processing section 16,
A color video signal Sn consisting of a color signal component reproduced based on the low-pass converted color signal and a luminance signal component reproduced based on the frequency modulated luminance signal is obtained, and is sent to the video signal output terminal 17 as a reproduced color video signal. derived.

On the other hand, the read audio signal R3a obtained from the rotary transformer 14 passes through the regenerative amplification section 18 to the switching section 19.
The signal is supplied to the movable contact 19a of the PSKS system, and is also supplied to the quadruple multiplier 21 included in the PSKS system audio signal reproduction unit 0.

The read audio 4-PSK signal Pa is output from the 4-multiplier 21 as 4
A multiplied signal 4Pa with a fundamental frequency of 8 MHz, a reading left AFM signal FLa, and a reading stand AF.
The fundamental frequency obtained by multiplying the M signal FRa by 4 is approximately 5
．． 2M11z and a multiplied signal 4F of approximately 5.3Mtlz
One or both of La and 4FRa is obtained, and one input terminal of the phase comparator 22 included in the PSKS system audio signal reproduction 0 and the band pass filter (BPF) 4
142 and 43. BPF41 has a relatively narrow pass frequency band with a center frequency of 8 MHz, and BPF42 has a center frequency of approximately 5.2 MII.
It is assumed that it has a relatively narrow passing frequency band defined as z,
Furthermore, the BPF 43 is assumed to have a relatively narrow pass frequency range with a center frequency of approximately 5.3 M1lz.

In this way, the read audio signal R3a becomes the read audio 4-PS.
If the signal includes only the K signal Pa, the quadruple multiplier 2
1, only a multiplied signal of 4 Pa is obtained, and therefore the BPF
A passing output signal C2 is obtained from BPF41, but BPF42
A high level detection output signal is obtained from the level detector 44 which detects the level of the passing output signal C2 from the BPF 41, and passing output signals from the BPFs 42 and 43 are not obtained. Low level detection output signals LL and 1 are obtained from the level detecting sections 45 and 46, respectively, which are designed to detect the level of .

Furthermore, when the read audio signal R3a includes only the read left AFM signal FLa and the reading platform AFM signal FRa, the quadruple multiplier 21 outputs the multiplied signals 4FLa and 4F.
Only Ra is obtained, therefore, no passing output signal is obtained from the BPF 41, and passing output signals CL and CM are obtained from the BPFs 42 and 43, respectively.As a result, a low level detection output is obtained from the level detecting section 44. At the same time, high-level detection output signals LL and LL are obtained from the level detection units 45 and 46, which are designed to detect the levels of the passed output signals CL and C, l from the BPFs 42 and 43, respectively. It is said to be in a state where

Furthermore, the reading audio signal R3a is the reading audio 4-PSK signal Pa, the reading power AFM signal FLa, and the reading table AFM signal F.
Ra, the quadrupling section 21 obtains the multiplied signals 4Pa, 4FLa, and 4FRa, and therefore, the BPF 41 obtains the passing output signal C1, and the BPFs 42 and 43 provide the passing output signals CL and CR, respectively. As a result, the level detection section 44
A high level detection output signal is obtained from the
A state is established in which high level detection output signals LL and LII are obtained from the level detection sections 45 and 46, respectively.

As described above, the detection output signals L, L, and L8 obtained from the level detectors 44, 45, and 46, respectively, are supplied to the system controller 50.

The system controller 50 has a terminal 51 connected thereto,
An operation mode designation signal SF is also supplied that designates an AFM playback mode in which audio is played back based on the playback AFM signal. Then, the system controller 50 performs the following operations when the operation mode designation signal SF is supplied, that is, when the AFM reproduction mode is designated, or when the operation mode designation signal SF is not supplied, that is, when the operation mode designation signal SF is supplied. AFM
When the playback mode is not specified, the detection output signals LL and 1 from the level detection section 44 take a low level, and the detection output signals LL and 1 from the level detection sections 45 and 46 take a high level, respectively. When the control signal Qs takes a high level, and when the operation mode designation signal SF is not supplied, the detection output signal from the level detecting section 44, p takes a high level, the control signal Qs takes a high level. A control signal Qs is sent out.

Control signal Q sent from system controller 50
s is supplied to the control ends of the switching sections 19 and 31, respectively. In the switching unit 19, when the supplied control signal Qs takes a high level, the movable contact 19a is connected to the selection contact 19b, and when the supplied control signal Qs takes a low level. When this is the case, the movable contact 19a is connected to the selection contact 19c. Furthermore, when the supplied control signal Qs takes a high level, the switching unit 31 switches the movable contact 3
1c is connected to the selection contact 31a, and when the supplied control signal Qs is at a low level, the movable contact 31c is connected to the selection contact 31b.

Therefore, when the operation mode designation signal SF is supplied to the system controller 50 and the AFM playback mode is designated, or when the AFM playback mode is not designated, the read audio signal R3a is the read power AFM signal. In the case where only FLa and the reading table AFM signal FRa are included, the switching unit 19 switches the movable contact 19a
is connected to the selection contact 19b, and the switching section 31 is placed in a state where the movable contact 31c is connected to the selection contact 31a. As a result, the read audio signal R
3a is supplied to the AFM audio signal reproduction section 32 through the switching section 19. In the AFM audio signal reproducing section 32, the reading power AFM included in the reading audio signal R3a is
Demodulation and other processing are performed on each of the signal FLa and the reading platform AFM signal FRa to reproduce the left and right signals of the stereo audio signal, and a reproduced audio signal S a I consisting of them is obtained. Then, the reproduced audio signal S
□ is led out to the audio output terminal 33 through the switching section 31.

On the other hand, when the operation mode designation signal SF is supplied to the system controller 5o and the AFM playback mode is not designated, the read audio signal R3a is changed to the read audio 4-
When only the PSK signal Pa or when the reading audio 4-PSK signal Pa, the reading force AFM signal FLa, and the reading platform AFM signal FRa are included, the switching unit 19 is in a state where the movable contact 19a is connected to the selection contact 19c. It is said that
Further, the switching section 31 is brought into a state in which the movable contact 31c is connected to the selection contact 31b. As a result, the read audio signal R3a is not supplied to the AFM audio signal reproducing section 32, but the PS included in the PSKS system audio signal reproduction 0.
The signal is supplied to the K demodulator 27.

At this time, one input terminal of the phase comparator 22 included in the PSKS system audio signal reproduction 0 receives the fundamental frequency obtained by multiplying the read audio 4-PSK signal Pa by 4 from the 4-multiplier 21. A multiplied signal 4Pa of 8MIIz is supplied. The phase comparator 22 includes a low pass filter (LPF) 23 connected to its output terminal and a voltage controlled oscillator (VCO) 24 whose oscillation range center frequency is 8MIIz, to which the output of the LPF 23 is supplied. - A loop (PLL) is configured, and the oscillation output Co of the VCO 24 is supplied to the other input terminal of the phase comparator 22. In the phase comparator 22, the multiplied signals 4Pa and V
The phase of the oscillation output Co of the CO 24 is compared, and the comparison output is supplied to the VCO 24 as an oscillation frequency control voltage through the LPF 23. As a result, the oscillation output Co of the VCO 24 has a frequency of 8? IHz, and the signal has a phase fluctuation that follows the phase fluctuation of the multiplied signal 4Pa.

The oscillation output Co from the VCO 24 with a frequency of 8 Ml (z) is supplied to the 1/4 step-down section 25.
4, and the frequency from the 1/4 step-down section 25 is reduced to 2M11.
A signal (CI) defined as z is obtained. That is, a carrier having a frequency of 2 MHz is reproduced based on the read audio 4-PSK signal Pa in the read audio signal R3a, and the reproduced carrier C1 is further converted to π/2 in the phase shifter 26. is phase-shifted by π with respect to the reproduced carrier C1.
The reproduced carrier C2 has a phase difference of /2. Then, the reproduced carriers C1 and C2 obtained in this way
is supplied to the PSK demodulator 27.

In the PSK demodulation section 27, the reproduced carriers C1 and C2 are used for the read audio 4-PSK signal Pa supplied through one switching section, and the 4-PSK
Phase demodulation is performed according to K demodulation method 2, and audio PCM digital data Da'' is obtained from the PSK demodulation section 27.

The audio PCM digital data Da obtained by the PSK demodulation section 27 is supplied to the error correction section 28 and subjected to error correction. Audio P
Obtained as CM digital data. Note that the error correction unit 28 outputs an error rate signal De indicating the reproduction error rate in the reciprocating audio PCM digital data.
is obtained and provided to system controller 50. The system controller 50 supplied with the error rate signal De sends out the muting control signal Qm when the reproduction error rate caused by the error rate signal De is equal to or higher than a predetermined value.

The error-corrected audio PCM digital data Da is then transferred to the digital/analog (D/A) converter 2.
In the D/A converter 29, the error-corrected audio PCM digital data Da is converted into an audio signal to obtain three reproduced audio signals, which are supplied to the muting unit 30. Ru. Muting section 3
0 performs muting on the reproduced audio signal Sa□ when the muting control signal Qm sent from the system controller 50 is supplied to the control terminal, and when the muting control signal Qm is not supplied,
The muting for the reproduced audio signal S□2 is canceled. Therefore, when the muting control signal Qm is not sent from the system controller 50, that is, when the error rate signal De from the error correction section 28 is lower than the predetermined value, the reproduced audio signal S
4□ is the muting section 30 and the switching section 31
The signal is output to the audio output terminal 33 through the audio signal.

- As described above, the reading left AFM signal FLa and the reading cloth AFM signal FR are adjusted according to the content of the reading audio signal R3a.
a is supplied to the AFM audio signal reproducing unit 32 and a reproduced audio signal based on them is properly obtained, and a read audio 4-PSK signal Pa is supplied to the PSK audio signal reproducing unit 20 and a reproduced audio signal based on it is properly obtained. A state in which a reproduced audio signal can be properly obtained is automatically established.

Control operation of G-2 system controller (FIG. 2) The system controller 50 is configured using, for example, a microcomputer, and the microcomputer performs the control operations as described above by the system controller 50. switching sections 19 and 3
1 and the muting section 30 are executed according to the flowchart shown in FIG. 2, for example.

In the flowchart shown in FIG. 2, after the start, in decision 61, the level detection unit 44.4
It is determined whether all of the detection output signals LP, LL, and RI obtained from signals 5 and 46 have a high level higher than a predetermined level. As a result of the determination in decision 61, if all of the detection output signals RI, LL, and LR are at a predetermined or higher level, it is determined in decision 62 whether or not the AFM reproduction mode is designated. If the result of determination in decision 62 is that AFM reproduction mode has been designated, then in decision 63 it is determined whether flag F is 1 or not. If flag F is not 1, that is,
If it is zero, in process 64, a control signal Qs having a high level is sent out, and the switching unit 19 is brought into a state where its movable contact 19a is connected to the selection contact 19b, and the switching unit 31 is brought into a state where its movable contact 19a is connected to the selection contact 19b. 31C
is connected to the selection contact 31a, and in the subsequent process 65, the flag F is set to 1, and then the process returns to process 61. Further, in the determination at decision 63, if flag F is 1, the process returns directly to process 61.

Furthermore, if it is determined in decision 62 that the AFM reproduction mode has not been designated, then in decision 67 it is determined whether flag F is 1 or not.

If flag F is 1, in process 68,
A control signal Qs having a low level is sent out, and the switching section 19 is brought into a state where its movable contact 19a is connected to the selection contact 19c, and the switching section 31 is brought into a state where its movable contact 31c is connected to the selection contact 31b. In the subsequent process 69, the flag F is set to zero, and then the process proceeds to decision 70. Further, in the determination at decision 67, if flag F is not 1, the process directly proceeds to decision 70.

In decision 70, the error rate signal De from the error correction section 28 is determined to be the reproduction error rate Pe.
It is determined whether or not is less than a predetermined reference error rate (RPe). If the result of determination at decision 70 is that the reproduction error rate Pe is less than the reference error rate 820, then at decision 71 it is determined whether the flag G is 1 or not. If the flag G is 1, the muting control signal Qm is being sent, so in process 72, the sending of the muting control signal Qm is stopped, and in the following process 73,
After setting the flag G to zero, the process returns to process 61. Further, in the judgment at decision 71, if the flag G is not 1, that is, if it is zero, 1. Return directly to process 61.

Further, if it is determined in decision 70 that the reproduction error rate Pe is equal to or higher than the reference error rate RPe, then in decision 74 it is determined whether the flag G is 1 or not. Then, if the flag G is not 1, in process 75, the muting control signal Q
After starting sending out the flag G and setting the flag G to 1 in the subsequent process 76, the process returns to the decision 70. Further, in the determination at decision 74, if the flag is G months, the process returns to decision 70.

On the other hand, as a result of the judgment in the decision 61, the detection output signals Lp obtained from the level detection sections 44, 45 and 46, respectively.
, Lt, and LR are not at a predetermined high level or higher, in decision 66, it is determined whether the detection output signal R is at a predetermined high level or higher. As a result, if the detection output signal RI is at a high level higher than a predetermined level, the process advances to decision 67, and the subsequent steps are performed as described above. On the other hand,
As a result of the judgment at decision 66, if the detection output signal is not at a high level higher than the predetermined level, decision 63
and proceed with each subsequent step as described above.

G-3 Modified Example In the above example, a reproduced audio signal is obtained by performing demodulation and other processing on the audio 4-PSK signal or AFM signal obtained by reading from a magnetic tape. The information reading and reproducing device according to the present invention is not limited to such an example, and the information reading and reproducing device according to the present invention can read audio 4-PSK signals or A
It is also possible to perform demodulation and other processing on modulated signals other than FM signals to obtain reproduction information.

Effects of the Invention H As is clear from the above explanation, according to the information reading and reproducing apparatus according to the present invention, the signal reproducing processing system performs demodulation and other processing on a phase modulated signal such as an audio 4-PSK signal. It is formed to include both a first reproducing section that obtains a reproduced output, and a second reproducing section that performs demodulation and other processing on other modulated signals such as AFM signals and obtains a reproduced output, and the second reproducing section obtains a reproduced output. A read output signal obtained from the medium through the signal reading section is supplied to the first reproducing section and reproduction information based on the phase modulation signal included therein is derived, and a read output signal is supplied to the second reproducing section. , a state in which reproduction information is derived based on other modulated signals contained therein can be selectively obtained, and furthermore, the read output signal from the signal reading section can be read from the first reproduction section and the first reproduction section depending on the content thereof. Appropriate operations that are selectively supplied to the second reproducing section are automatically performed. Therefore, even if the recording medium has one or both of a phase modulation signal and other modulation signals recorded thereon, the recorded information can be properly read and reproduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of an information reading and reproducing apparatus according to the present invention, FIG. 2 is a flowchart regarding control operations performed by a microcomputer forming a system controller in the example shown in FIG. 1, and FIG. and FIG. 4 is a characteristic diagram showing the frequency spectrum of a recording signal for a 6R tape. In the figure, 11 is a rotating magnetic head section for video signals, 13 is a rotating magnetic head section for audio signals, 19 and 31 are switching sections, 20 is a PSK audio signal reproducing section, 21 is a quadrupling section,
22 is a phase comparator, 23 is an LPF, 24 is a VCO 125
27 is a PSK demodulator, 32 is an AFM audio signal reproducing unit, 41, 42 and 43 are BPFs, 44.
45 and 46 are level detection units, 50 is a system controller, and 'rp is a magnetic tape.

Claims (1)

[Claims] A phase modulated signal obtained by phase modulating a carrier signal having a first frequency using digital data, and a carrier wave signal having a second frequency different from the first frequency are information. From a recording medium on which one or both of other modulated signals obtained by being modulated by the signal are recorded,
a signal reading unit that reads either or both of the phase modulation signal and the other modulation signal to obtain a read output signal; and a signal reading unit that performs demodulation and other processing on the phase modulation signal read from the recording medium to reproduce a digital a data reproducing section for obtaining data; an information reproducing section for performing demodulation and other processing on other modulated signals read from the recording medium to obtain a reproduced information signal; and a reading obtained from the signal reading section. a switching unit that selectively supplies an output signal to each of the data reproducing unit and the information reproducing unit; and when the read output signal obtained from the signal reading unit includes the phase modulated signal, the phase modulated signal a carrier wave signal forming unit that reproduces a carrier wave signal based on the base to obtain a reproduced carrier wave signal and supplies the reproduced carrier wave signal to the data reproducing unit; a signal detection section that detects a signal component corresponding to a signal obtained by the signal detection section; and a signal detection section that detects a signal component corresponding to a signal obtained from the signal detection section; An information reading and reproducing device comprising: an operation control section that causes a state of supplying data to a data reproducing section;