JPS61118081A - Recording/reproducing system - Google Patents

Abstract

PURPOSE:To reproduce respective information signals in the form of reproduction in accordance with an identifying signal at reproduction by recording the identifying information which stipulates a reproducing form of respective pieces of information when plural information signals different in modulating system are recorded to recording media. CONSTITUTION:Plural information signals of a different modulating system are recorded in recording media, and in a reproducing system, for example, in LDD, an identifying signal to stipulate the reproducing form of respective pieces of information simultaneously with the recording of the information signal is simultaneously recorded. The recording place, when the signal is inserted to digital information, is a user's bit of a CD format, and when the signal is inserted to video information, the signal is inserted in a vertical blanking period. When based upon the identifying signal inserted in the vertical blanking period, an audio output system is controlled, an identifying signal extracting circuit 81 synchronizes with a timing signal from a timing generating circuit 80 and extracts the identifying signal included in the video output. A reproducing form discriminating device 82 discriminates a reproducing form from the extracted identifying signal and controls an audio output system so that it may be the reproducing form.

Description

Detailed Description of the Invention [1] The present invention also provides a recording medium for recording and reproducing a plurality of information signals of different modulation methods on a recording medium, and particularly a disc-shaped recording medium for recording audio signals. A digital audio disc (hereinafter referred to as a CD), which is a so-called compact disc (hereinafter referred to as a CD) in which a signal is recorded after being subjected to a predetermined digital modulation process and converted into a pulse train, and a video disc (hereinafter referred to as an LD) in which a video signal and an audio signal are respectively frequency-modulated and recorded. ) is known,
Furthermore, recently, a method has been developed in which a pulse train signal obtained by digitizing an audio signal using a predetermined digital modulation method is superimposed and recorded on each FM modulated signal of a video signal and an audio signal (Patent Application No. 58-45780, Mei. 18, Teru Yamaya). A video disc (hereinafter abbreviated as LDD) has been developed.

In this recording system, the audio signal is made into two channels, and the 2.3 MHz and 2.8 MHz audio carriers are each FM modulated by two audio channels. Further, the video signal is frequency-converted so that the sync tip is 7°6 MHz, the pedestal level is 8.1 MH2, and the white beak is 9.3 MH2. Then, the audio signal is further converted into PCM (Pulse Code Modula).
The signal is digitized and converted into a pulse train signal using a modulation method such as tion).

This pulse train signal is, for example, an EFM (Eight to
The signal is suitable for recording due to the fourteen modulation (Fourteen Modulation) method, and the frequency spectrum is the frequency component of a pulse train having a width of 3 to 117. Here, T indicates the bit period of the PCM signal, and the three pulses are approximately 720KH2, and the maximum width is 11T.
The pulse frequency is approximately 200KHz. Such a pulse train signal is superimposed on the video main carrier at a level of about 1/10 or less, and is slice-amplified near the zero-crossing point to become a pulse-width modulated signal, which is used as a recording signal.

RF<high frequency) obtained from a recording disk on which video signals and audio signals are recorded using the above recording method.
The frequency spectrum of the signal is as shown in FIG. In Figure 1, the component indicated by A is a digitized audio signal component, the component indicated by B is an audio FM signal component, the component indicated by C is a color information component in a video FM signal, and the component indicated by D is a digitalized audio FM signal component. This is a luminance information component.

Since the dynamic range of the digitized audio signal can be approximately 90 dB or more, the sound quality can be significantly improved compared to recording and reproducing audio signals using the FM modulation method.

As described above, in the case of an LDD, multiple information signals with different modulation methods can be recorded and reproduced, so various information contents of these information signals can be selected and combined as appropriate for recording and reproduction.
By playing back, you can enjoy a variety of things that were not available with conventional LDs! This means that we can hope for the development of video discs that can be played on ``g''.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a recording and reproducing method that can determine the reproduction mode of a plurality of recorded information signals and automatically reproduce them according to the reproduction mode. shall be.

In the recording and reproducing method according to the present invention, when recording a plurality of information signals with different modulation methods on a recording medium, an identification signal that determines the reproduction mode of each information signal is also recorded, and upon reproduction, according to this identification signal, It is characterized by reproducing each information signal in a reproduced manner.

1-1-9 Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 2 is a block diagram showing an embodiment of a recording disc information reproducing apparatus according to the present invention. The Kagaru playback device is a CD
, LD, and LDD. This player has video discs (L
D, LDD) and digital audio discs (CD>
Since the reproduction rotation speed and the like are different between the two, a spindle motor 1 for driving the LD and LDD rotation and a spindle motor 2 for driving the CO rotation are provided. These spindle motors 1
, 2 are selected depending on the type of disc to be reproduced, and are switched by a switching mechanism 4 using a motor 3 as a driving source, for example.

In order to detect the disc size of the disc 5 to be reproduced, for example, three detection sensors 6, 7 and 8 are provided corresponding to the disc size in the disc radial direction. The disc size for CDs is approximately 5 inches (1
2ca+), and in the case of video discs (LD, LOD), there are two types of outer diameters: 8 inches and 12 inches. The respective outputs of the three detection sensors 6, 7 and 8 are waveform-shaped by a waveform shaping circuit and then supplied to the disk discrimination circuit 1Q. As the detection sensor, for example, an optical sensor is used, but the detection sensor is not limited to this.

The disc discrimination circuit 10 determines whether the disc to be played is a CD or an LDD based on the detection outputs of the detection sensors 6.7 and 8.
It is determined which of the three types of disks, LD and LD. A specific circuit configuration of this disk discrimination circuit 10 is shown in FIG. In this diagram, in the case of CD,
The minimum disk size is determined to be <12c+a),
The detection output of the innermost detection sensor 6 and the inverter 79.
The output of the AND gate circuit 78 which converts the inverted output of the detection sensor 7.8 which has passed through the detection sensor 80 into three-man power becomes the CD discrimination information. That is, the detection sensor 6 is on and the other detection sensors 7.8
When it is off, it is determined that it is a CD. In the case of a video disc, since the disc sizes are 8 inches and 12 inches, the detection output of the detection sensor 7 or 8 is passed through the OR gate circuit 69 to the AND gate circuits 70 and 71.
It becomes human power. In addition, a frame synchronization detection circuit 21 to be described later
A frame synchronization detection signal, which is emitted when a frame synchronization signal is detected from the input circuit 71, becomes a bubble input to the ND gate circuit 71, and is also inverted by an inverter 72 and becomes a bubble input to the AND gate 8 circuit 70. . When the detection output of the detection sensor 7 or 8 is generated and the frame synchronization detection signal is input, the AND gate circuit 71 outputs LDD discrimination information, and when the frame synchronization detection signal is not input, the AND gate circuit 70 outputs the LDD discrimination information. Discrimination information is output. This discrimination information is used to drive an indicator 11 that displays the type of disc, and as a switching signal for various switches to be described later.

A pickup 12 for reading recorded information from the disk 5 is supported by a slider base (not shown) that is movable in the radial direction of the disk 5, and the slider base is driven by a slider motor, a reduction gear, etc. (not shown). The read information read from the recording disk 5 by the pickup 12 is supplied to a digital information demodulation system 14, an audio demodulation system 15, and a video demodulation system 16 through an RF amplifier 13. The RF amplifier 13 has a wide band of about 5 KH2 to 14 MHz, and a single amplifier can amplify a reproduced PCM audio signal, a reproduced FM audio signal, and a reproduced video signal.

The digital information demodulation system 14 is provided with a changeover switch 17 that changes depending on the type of disc to be reproduced.
Based on the disc information from , it switches to the A side in the case of an LDD, and to the B side in the case of a CD. That is, L.D.
The signal processing system for the reproduced digital signal is switched between D playback and CD playback. When playing a CD, the playback RF output is PCM audio information, and this PCM
The audio information is processed by an equalizer 18 using MTF (Modulation
Transfer Function) compensation is applied.

On the other hand, in the case of LDD, FM audio information and FM
PCM audio information included in the reproduced RF signal together with the video information is extracted by an LPF (low pass filter) 19 and supplied to a de-emphasis circuit 20. PCM
Audio information is, for example, an EFM signal, but if the digital signal is directly superimposed on an FM-modulated video signal during recording, the digital signal component will be interfered with by the low-frequency component of the FM video signal. Low frequency components are boosted and recorded. Therefore, during reproduction, the de-emphasis circuit 2o performs compensation by dropping the low-frequency components boosted during recording. This makes it possible to improve the S/N ratio of the digital signal with respect to low frequency noise during recording and reproduction.

Note that instead of switching the No. 13 processing system using the changeover switch 17, the power supply to each signal processing system circuit is turned off.
A similar effect can be obtained by using N10FF.

The reproduced EFM signal that has passed through the changeover switch 17 is supplied to the EFM demodulation circuit 22 via the frame synchronization detection circuit 21 and is also supplied to the reproduced clock extraction circuit 23. The EFM demodulation circuit 22 demodulates the signal into a PCM digital signal.

This demodulation (No. 3 is refined by the control of the memory controller 25 to the memory 24 such as RAM (Random Access Memory), but at this time, the memory controller 25 uses the divided output of the reproduced clock by the frequency divider 26 and the input clock. Write in synchronization with .

Reading of stored information from the memory 24 is performed in synchronization with a readout clock obtained by dividing the oscillation output of a vCO (voltage controlled oscillator) 27 in a PLL (phase locked loop) circuit by a frequency divider 28. It has become so. The PLL circuit is the vCO27 mentioned above.
, the frequency division output from the frequency divider 29 of the regenerative output and the V CO
A phase comparison a (P/C) 31 which uses the frequency division output of the frequency divider 27 of the oscillation output of 27 as an input, an LPF (low pass filter) 32 which receives this comparison output as input, and this LP
It is constituted by a changeover switch 33 that selectively supplies the output voltage of F32 and the reference voltage Vref+ to the VCO 27.

In the PLL circuit, the change-over switch 33 is set to the a side and outputs the output voltage of the LPF 32 during LDD playback, and switches to the b side to set the reference voltage yrer to the VCO during CD playback, based on the discrimination result of the disc discrimination circuit 10 described above.
Supply to 27. As a result, during LDD playback, the read clock for reading stored information from the memory 24 is set to P.
The LL circuit synchronizes the phase with the playback output, and when playing a CD, the loop switch 59, which will be described later, is turned on and off.
By turning on (opening) the output of the phase comparator 31 becomes L.
By driving the spindle motor 2 for driving the CD rotation through the PF 77, the reproduced clock is phase-synchronized with the fixed clock obtained by the VCO 27 whose bias is in a fixed state.

The digital signal thus read out is converted into an analog audio signal by a D/A (digital/analog) converter 34, and then sent to an LPF 35L.

Left and right playback audio outputs are provided via 35R.

The usage status in the memory 24 is constantly monitored by the memory controller 25, and when the memory 24 overflows or becomes blank (no data), the controller 25 sends information indicating these statuses to the voltage generator 3.
Supply to 6. During LDD regeneration, this voltage generator 36
generates a positive control voltage when the memory 24 overflows, and generates a negative control voltage when the memory 24 becomes blank, according to information indicating the usage status of the memory 24 from the memory controller 25. By superimposing it on the output voltage of the LPF 32 and supplying it to the VCO 27 via the changeover switch 33, the frequency of the read clock is increased by υj(Il).

In this way, m of the data stored in the memory 24 is constantly monitored, and when there is an excess or deficiency in the capacity and processing capacity of the memory 24, a positive or negative control 2II voltage is generated to cause the PLL circuit to deal with the problem. By making this request, the memory 24 can always be maintained in a normal state.

In the analog audio demodulation system 15, the output of the BPF (band pass filter>371.37R) that passes only the audio carrier components of 2.3 MHz and 2.8 MHz from the reproduced RF signal is sent to the FM demodulators 38L and 38R.
FM demodulation is performed in the de-emphasis circuit 39L.
, 39R as left and right playback audio outputs.

In the video demodulation system 16, only video information is extracted from the reproduced RF signal by a BPF & notch circuit 40. This E3
In the PF & notch circuit 40, the EFM components included in the reproduced RF signal and 2.3MHz, 2.8M
Hz audio carrier components are actively removed. This extracted information is supplied to the FM demodulator 42 via the limiter circuit 41 and is FM demodulated. This demodulated output is passed through a dropout compensator (DQ
C) 44 and dropout at the compensator 44? iiii Atonement will be made. This dropout compensator 44 includes, for example, an HPF (bypass filter) 45
A dropout sensor (analog switch that is turned off by the detection output of the DOS sensor 46) that detects dropout based on the reproduced RF signal supplied via the output terminal of the switch and the reference potential point Therefore, when a dropout occurs, the level of the output of the LPF 43 immediately before the output of the dropout sensor 46 is held and sent to the next stage circuit, thereby performing dropout compensation. The output of this dropout compensator 44 becomes the video output.

The output of the dropout compensator 44 is sent to the horizontal sync separation circuit 4.
7, and the horizontal synchronizing signal is separated and output. This horizontal synchronizing signal is supplied to phase comparators 48 and 49, and the phase difference with the reference signal output from the reference signal generator 50 is detected. The output of the phase comparator 48 becomes the independent power of the adder II 51, and the outputs of the four phase comparators become the independent power of the adder 51 via the equalizer amplifier 52. The output of the adder 51 drives the LDD and the spindle motor 1 for driving the rotation of the LD via an equalizer amplifier 53 and a driver 54. This is the spindle servo system. Further, the output of the equalizer amplifier 52 is connected to a loop switch 55,
An actuator (not shown) built into the pickup 12 is driven via the changeover switch 56 and the driver 57.

By driving this actuator, a light spot for reading information is biased in the tangential direction of the recording track of the disk. This is the tandiencharmipo group. Note that the actuator may be a tangential mirror that rotates to shift the optical spot for reading information in the tangential direction of the recording track of the disk, or a tangential mirror that displaces the lens in a direction perpendicular to the optical axis. The optical spot for information reading may be biased in the tangential direction of the recording track of the disk.

The loop switch 55 is turned on (closed) in response to a spindle lock signal output from the spindle lock detection circuit 58 when locking of the spindle servo system is substantially completed. That is, at the start of reproduction, first, the spindle motor 1 is driven by the output of the phase comparator 48, and coarse adjustment of the time axis (spindle servo) is performed.
When the locking of the spindle servo is substantially completed, the loop switch 55 is turned on, and the actuator is driven by the output of the phase comparator 49 to perform fine adjustment of the time axis (tangential servo).

According to this, residual jitter components that cannot be removed by the spindle servo system can be removed by the tangential servo system.

However, even in the tangential servo system, jitter cannot be completely removed because a mechanical system such as an actuator drive mechanism cannot sufficiently follow the high-frequency component of residual jitter. Therefore, in the digital information demodulation system 14 mentioned above, the PL that generates the read clock is
The residual jitter component can be removed by setting the cutoff frequency of the LPF 32 of the L circuit to be lower than the maximum frequency of the band of the tangential volume to cut the high frequency component of the residual jitter. More preferably, by setting the cutoff frequency of the LPF 32 lower than the disk eccentricity frequency (30 to 8H2 in the case of LDD), it is possible to completely eliminate jitter caused by disk eccentricity.

Although the spindle servo and tangential servo were performed based on the horizontal synchronization signal, the same effect could be obtained by performing the spindle servo and tangential servo based on the 3,58M1-1z color subcarrier included in the reproduced FM video signal. It will be done.

The above is a servo system when reproducing a video disc (LDD, LD), but when reproducing a CD, spindle servo is performed based on the output of the phase comparator 31 in the digital information demodulation system 14 described above. Zunawara,
The output of the phase comparator 31 drives the spindle motor 2 for driving the CD rotation via the loop switch 59 which is turned on (open) during CD reproduction and the driver 60. Conventionally, the above-mentioned tangential mebo has not been performed during CD playback, but since the spindle motor 2 cannot sufficiently follow the high-frequency component of the output signal of the phase comparator 31, which is a time axis error signal, In this example, HPF6
1i%: The 1a region component of the time axis error signal extracted from the servo drives the actuator ball in the pickup 12 via the changeover switch 56 and the driver 57.
It also uses a tangential servo. The changeover switch 56 is switched to the a side when reproducing an LDD or LD, and to the b side when reproducing a CD, based on the determination result of the disc discriminating circuit 10.

Although the tangential servo during CD playback is performed based on the divided output of the reproduced clock extracted by the reproduced clock extraction circuit 23, Even if it is performed based on the frequency output, the same effect can be obtained since the frame synchronization signal and the reproduced clock are in a synchronous relationship.

The output of the spindle lock detection circuit 58 is connected to the inverter 62.
The signal is inverted at , and becomes the sole power of the OR gate circuit 63 as a bus spindle unlock signal indicating that the spindle servo system is not in the locked state.

As the output of the OR gate circuit 63, a random access information signal generated at the time of a random access command such as scan, search, jump, etc. is supplied. Furthermore, the LDD information output from the disk discrimination circuit 10 is also input to the OR gate circuit 63.

The output of the OR gate circuit 63 is supplied to the recovered clock extraction circuit 23 via the control command circuit 64.

A specific circuit configuration of the recovered clock extraction circuit 23 is shown in FIG. In this figure, the reproduced EFM signal is transmitted to the phase comparator 6.
5, the phase difference with the oscillation output of the VCO (voltage 11111 oscillator) 66 is detected, and the phase difference signal is sent to the LPF 6.
7 and a changeover switch 68 to the VCO 66 . As described above, a PLL circuit that generates a reproduced clock is configured.

The changeover switch 68 is normally on the a side and supplies the output of the LPF 67 to the VCO 66, but the
When a command signal is output from the command circuit 64, the voltage is switched to the b side in response to this command signal, and the voltage is set to a predetermined reference voltage V.
refz is supplied to the VCO 66.

That is, when the spindle servo is not in the locked state or when the information reading optical spot jumps tracks due to random access commands such as scan, search, jump, etc., the reference Ti pressure Vre'2 is applied to the VCO 66. By fixing the oscillation frequency to a value close to the reproduced clock frequency, it is possible to hasten the lock-in of the reproduced clock after the spindle servo is locked or after the random access command is released.

Referring again to FIG. 2, the audio output section includes a pair of left and right output terminals 73L and 73R of the analog audio output system.
A pair of left and right output terminals 74L and 74R of a digital audio output system are provided. Output terminal 73L,
The audio output from the analog audio demodulation system 14 is supplied to 73R. This audio output is sent to output terminals 74L and 74 via a changeover switch 75 during LD playback.
It is also supplied to R. The changeover switch 75 is located on the a side when playing an LD, for example, as a normal state.

When playing a CD, the mode is switched to bflllll based on the disc discrimination information from the disc discrimination circuit 10. The audio output from the digital information II system 14 is controlled by the left and right mode selector switches 76L and 76R and the selector switch 7.
5 to output terminals 74L and 74R.

As a result, during LD playback, the output terminal 73L.

Normal audio signals are output from 73R and output terminals 74L and 74R, and during LDD and CD playback, high-quality audio signals are output from output terminals 741.74R, and normal audio signals are output from output terminals 73L and 73R during LDD playback. An audio signal will be output.

The mode changeover switches 76L and 76R are provided to change over the output mode of digital audio audio signals in an analog stage. In other words, if the audio output from the digital audio demodulation system 14 is stereophonic, the above-mentioned output mode will suffice, but in the case of audio multiplexing, for example, if the left (V) channel is Japanese and the R (right) channel is A mode selector switch 76L that is in a foreign language and operates independently of each other;
76R allows the audio output from the output terminals F74L and 74R to be switched to three output modes: Japanese and foreign languages, Japanese only, and foreign languages only. The mode changeover switches 76L and 76R are driven separately according to control information from an operation section (not shown).

Relays that operate independently are used as the mode changeover switches 76L and 76R. Normally, a relay with one movable contact and two fixed contacts is sufficient for signal switching, but in this embodiment, a relay with one movable contact and two extra fixed contacts is used. is used. That is, if we take the relay 761 on the L channel side as an example, there are two sets of movable contacts S that interlock with each other.
l+.

521, and two sets of fixed contacts S+2.13, Sη, provided one pair each for the two sets of movable contacts Su and S21.
23, and the two fixed contacts S+2, which are the most distant among the two sets of fixed contacts. S23 serves as an input end for two signals (left and right audio signals), and one movable contact S I+ serves as an output end. According to this, since two gears αJ exist between the left and right signal lines, crosstalk between the left and right signals can be reliably prevented. Of course, crosstalk can be more reliably prevented by increasing the number of contacts and providing more gaps.

In the case of an LDD, multiple pieces of information with different modulation methods can be recorded and played back, so the information content of each of the two digital audio channels and the two analog audio channels can be selected and used in various combinations. This allows reproduction in various ways.

Examples of how to use it include, for example, making two channels of digital audio into a stereo system and two channels of analog audio into two languages to create a stereo bilingual movie, etc., and two channels of digital audio into stereo. Mr. Reiko uses the 2 channels of analog audio as karaoke and uses the singer's singing voice etc. as high-fidelity karaoke, the 2 channels of digital audio are used as high-level questions and answers, and the 2 channels of analog audio are used as easy-to-understand questions and answers. (Free combinations) Play as a multi-functional, multi-purpose educational system! tl etc. can be considered.

In addition, as a method of using the combination of video output and audio (4 channels) output, digital audio system can be used as digital information of image information that is digitized,
Reiko-sama, which outputs text by superimposing it on video, Reiko-sama, which outputs audio and text as an explanation of the video, and outputs a combination of 2-channel video (1 channel is a still image) and 4-channel audio. It is possible that the re-ecology is similar to that of other species.

In order to identify these reproduction ecology types, identification signals that define each reproduction ecology type are required. This identification signal is recorded on the recording disk together with each information signal, and by being read during playback, each information is reproduced in a manner corresponding to the identification signal.
The Ei signal is automatically reproduced. When inserted into digital information, this identification signal
The user's bit (for example, an empty channel such as the Q channel) in the subcode part of the format or the TOC (Table o
If inserted into the video information, the vertical return of the video format! It is inserted in the A period.

FIG. 5 shows a control circuit for controlling an audio output system based on an identification signal inserted into a vertical blanking period of a video format, for example.

In this figure, a timing generation circuit 80 which receives a horizontal synchronization signal from a horizontal synchronization component MF11 path 47 (shown in FIG. 2) generates a timing signal based on the horizontal synchronization signal, and outputs a timing signal to an identification signal extraction circuit 81. supply to. The identification signal extraction circuit 81 synchronizes with the supplied timing signal,
The identification code included in the video output from the video demodulation system 16 (shown in FIG. 2) is extracted. Reproduction mode discrimination circuit 82
The reproduction mode is determined based on the identification signal extracted by the identification signal extraction circuit 81, and the audio output system is turned on to reproduce each information item according to the reproduction mode.

Although not shown in the figure, the position of the pickup 12 relative to the disk 5 in the direction perpendicular to the disk surface -
2 Control 211 of the focus servo system and the position of the pickup 12 in the disk radial direction 1? Naturally, a tracking servo system is also provided, and in these servo systems, the signal processing system for error signals is switched between when playing a video disc (LDD, LD) and when playing a digital audio disc (CD). g! of the disc that is preferably played. Good servo can be performed regardless of the type.

In addition, the digital signal recorded on CD or LDD is
In addition to audio information and digitized image information, it also includes digitized control information for controlling the computer a.

11 Encircle 1 As explained above, according to the recording and reproducing method according to the present invention, when recording a plurality of information signals with different modulation methods on a recording medium, an identification signal that determines the reproduction mode of each information signal is also recorded. Then, during reproduction, each tR reward signal is reproduced in a reproduction mode according to this identification signal, so by selecting various information contents of these information signals and combining them appropriately, recording and reproduction can be performed. , it becomes possible to play back in various ways that were not possible with conventional video discs.

[Brief explanation of the drawing]

Figure 1 shows the frequency of an RF signal obtained from a recording disk recorded by superimposing a signal obtained by frequency modulation processing of a video signal and an audio signal, respectively, and a signal obtained by PCM modulating an analog signal and making it into a pulse. 2 is a block diagram showing an embodiment of the recording disc information reproducing apparatus according to the present invention; FIG. 3 is a block diagram showing the specific circuit configuration of the disc discrimination circuit in FIG. 2; FIG. 4 is a block diagram showing a specific circuit configuration of the reproduced clock extraction circuit in FIG. 2, and FIG. 5 is a block diagram of 10 i and II circuits that control the reproduction mode. Explanation of symbols of main parts 1...Swiss spindle motor 2 for LD and LDD
...CD spindle motor 5...Recording disc 10...Disc discrimination circuit 12...Pickup 14...Digital information demodulation system 15...・・・
・Analog audio mW system 16...Video demodulation system

Claims (4)

[Claims] (1) When recording a plurality of information signals with different modulation methods on a recording medium, an identification signal that determines the reproduction mode of each information signal is also recorded, and when playing back, each information signal is reproduced in a reproduction mode according to the identification signal. A recording and reproducing method characterized by reproducing signals. (2) The recording/reproducing method according to claim 1, wherein the frequency bands occupied by the plurality of information signals are different from each other. (3) one of the plurality of information signals is a signal in which predetermined information is subjected to predetermined digital modulation processing and pulsed;
2. The recording and reproducing system according to claim 1, wherein the identification signal is inserted into a subcode section of a CD format or a lead-in area of a recording medium. (4) One of the plurality of information signals is a frequency-modulated video signal, and the identification signal is inserted into a vertical blanking period of the video format. The recording and reproducing method described in Section 1.