JPH0412522B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a magnetic recording and reproducing device, and in particular, a first rotary head for recording and reproducing a frequency multiplexed signal of a frequency modulated wave by a luminance signal and a low frequency conversion carrier color signal; The occupied band of the frequency modulated wave by the audio signal and the occupied band of the low source converted carrier chrominance signal occupy the intermediate portion between the occupied band of the frequency modulated wave by the luminance signal and the occupied band of the reduced converted carrier chrominance signal. FM by helical scanning onto the magnetic tape with a second rotary head that records and reproduces the frequency modulated wave by the audio signal that occupies the middle part.
The present invention relates to a magnetic recording and reproducing apparatus of a type that enables high-fidelity recording and reproduction of audio signals by deep recording audio signals and superficial recording of video signals. (Prior art and problems) In recent years, household VTRs (magnetic recording and reproducing devices) have rapidly become popular, and it has become possible to record and reproduce color television images of good quality easily even at home. However, in the above-mentioned home VTR, in order to achieve long-term recording and playback with a small amount of magnetic tape, the running speed of the magnetic tape is slowed down and various other techniques are applied. This is well known. By the way, in the conventional most common home VTR, audio signals were recorded and played back using an audio track provided in the longitudinal direction of the magnetic tape using a fixed audio head. However, VHS was one of the VTRs that could solve the above problems.
A Hi-Fi VTR was provided. This new
The VTR includes a first rotary head for recording and reproducing a frequency multiplexed signal of a frequency modulated wave by a luminance signal and a low frequency converted carrier chrominance signal, and an occupied band and a low frequency band for the frequency modulated wave by the luminance signal. A second rotary head records and reproduces a frequency modulated wave by an audio signal that occupies an intermediate portion between the band occupied by the converted carrier chrominance signal, and the FM audio signal is deeply recorded on the magnetic tape by helical scan. This is a type of magnetic recording and reproducing device that records signals on the surface layer, and this VHS Hi-Fi method
VTRs are described, for example, in the magazine "Broadcasting Technology", November 1983 issue, pages 170 to 175. Now, in the above-mentioned VHS Hi-Fi system VTR, the characteristics of the audio signal recorded on the magnetic tape as an FM audio signal by the rotating head are dramatically improved, so the VTR can be used as a high-fidelity audio device. has also attracted attention as an attractive feature, and it has become possible to record and play back only audio signals with high fidelity.
It is no longer rare for VCRs to be used. However, with the conventional VHS Hi-Fi system VTR,
It is configured so that recording of video signals, recording of FM audio signals, and recording of normal audio signals are performed at the same time, so even when trying to record only FM audio signals, For example, a black level video signal was recorded on the video track, and a normal narrowband audio signal from a fixed head was recorded on the normal audio track. Even when attempting to record only FM audio signals as described above, meaningless information signals such as black level video signals are recorded on the video track, which means that the video track is wasted. This is not desirable from the point of view of effective use of magnetic tape, and contrary to the above case, it is originally a narrow band audio signal, such as a signal consisting only of human voices such as news, etc. Alternatively, in the case of audio signals associated with movie broadcasts, recording them as FM audio signals does not produce any special effects, and in such cases it is best to record them using a fixed audio head. Even though it would be sufficient to have a narrow band audio signal, the narrow band audio signal is also recorded as an FM audio signal, even though it is possible to record a wide frequency band signal. , this means that it is being used in a wasteful manner. (Means for Solving the Problems) The present invention provides a first rotary head for recording and reproducing a frequency multiplexed signal of a frequency modulated wave by a luminance signal and a low frequency conversion carrier chrominance signal, and a second rotary head for recording and reproducing a frequency modulated wave by an audio signal that occupies an intermediate portion between the occupied band of the frequency modulated wave and the occupied band of the low frequency conversion carrier color signal; and the first rotary head described above. Corresponding to the position of the image track formed on the magnetic tape by helical scan on the magnetic tape,
A video track compatible control head for recording and reproducing control pulses on a video track compatible control track set in the longitudinal direction of the magnetic tape at a first position of the magnetic tape, and a helical control head on the magnetic tape by the aforementioned second rotary head. FM formed on magnetic tape by scanning
an FM audio track compatible control head for recording and reproducing control pulses on an FM audio track compatible control track set in the longitudinal direction of the magnetic tape at a second position of the magnetic tape in correspondence with the position of the audio track; and a magnetic tape. A fixed audio head for recording and reproducing audio signals in the longitudinal direction of the magnetic tape, and a previously recorded portion over the entire width of the magnetic tape are placed in a position preceding the recording portion on the magnetic tape by the first and second rotary heads. The above-mentioned problems are solved by providing a magnetic recording/reproducing apparatus comprising a full-width erasing head for erasing data, and means for controlling the supply of signals to each of the above-mentioned heads. That is, in the magnetic recording and reproducing apparatus of the present invention, control pulses are recorded and reproduced in the longitudinal direction of the magnetic tape in correspondence with the position of the FM audio track formed on the magnetic tape by the second rotating head as described above. Equipped with a control head compatible with audio tracks and other magnetic heads, it is possible to record FM audio signals and video signals on magnetic tape at any time unrelated to each other, and on a recorded magnetic tape with an FM audio signal recorded on it.
You can record the video signal overlapping it at any time later.
The above-mentioned conventional problems have been solved by providing a magnetic recording/reproducing device that can easily be used as a recorded magnetic tape in which both an FM audio signal and a video signal are recorded. (Example) Hereinafter, specific contents of the magnetic recording/reproducing apparatus of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a plan view showing a schematic configuration of a magnetic tape running system in an embodiment of the magnetic recording and reproducing apparatus of the present invention. In FIG. The rotary head drum 1 in this example includes two rotary heads Hv and Hv (first and second rotary heads) for recording and reproducing video signals for recording and reproducing a frequency multiplexed signal of a frequency modulated wave by a luminance signal and a low frequency conversion carrier color signal. rotating head Hv, Hv),
Two units for recording and reproducing FM audio signals for recording and reproducing frequency modulated waves by audio signals that occupy an intermediate portion between the occupied band of the frequency modulated waves by the luminance signal and the occupied band of the low frequency conversion carrier color signal. rotating head Haf, Haf (second rotating head Haf,
Haf) is shown as being provided. The first rotary heads Hv, Hv and the second rotary heads Haf, Haf are in a state where the rotary head drum 1 is rotating at a predetermined number of rotations and the magnetic tape MT is running at a predetermined running speed. In this method, tracks (recorded traces) can be formed at approximately the same portion on the magnetic tape MT. The magnetic tape T is pulled out from the feed reel 3 in the cassette 2 and guided to the guide poles 5 to 13 by the capstan 14 and the pinch roller 15 at a predetermined constant running speed, and is guided to the rotating head drum 1 (and The film is wound around the outer periphery of a fixed head drum (fixed head drum) and then taken up on the take-up reel 4 in the cassette 2. magnetic tape MT
It is well known that the vehicle is controlled to a predetermined constant traveling speed by the operation of a capstan servo system. In the middle of the running system of the magnetic tape MT mentioned above,
At a position preceding the recording portion on the magnetic tape MT by the first and second rotary heads Hv and Haf, there is a full-width erasing head Het for erasing the previously recorded portion over the entire width of the magnetic tape MT. A combination head 16 is provided between the rotary head drum 1 and the take-up reel 2, as shown in FIG. It is being In the combination head 16 shown in FIG. 2, Hvc is the first rotary head described above.
A control pulse is applied in the longitudinal direction of the magnetic tape MT corresponding to the position of the video track (indicated by the symbol Tv in FIG. 3) formed on the magnetic tape MT by helical scanning of the magnetic tape MT by Hv. A control head Hvc corresponding to the video track to be recorded and played back; Hev is a control track (indicated by the symbol Tcv in FIG. 3) on which control pulses are recorded by the control head Hvc corresponding to the video track described above. ) is a video track compatible control track erasing head Hev, and Hac
The magnetic tape is scanned by the second rotary head Haf, which performs helical scan on the magnetic tape MT.
This is an FM audio track compatible control head Hac that records and reproduces control pulses in the longitudinal direction of the magnetic tape MT in correspondence with the position of the FM audio track (indicated by the symbol Taf in Fig. 3) formed on the MT. , Furthermore, Ha is a fixed audio head Ha that records and reproduces audio signals in the longitudinal direction of the magnetic tape MT, and Hea is a fixed audio head Ha that records and reproduces audio signals in the longitudinal direction of the magnetic tape MT.
Audio tracks formed on MT (symbols in Figure 3)
This is an audio track erasing head Hea that erases the track (denoted by Ta). FIG. 3 shows a recording trace pattern (track pattern) recorded and formed on the magnetic tape MT by the magnetic recording/reproducing apparatus shown in FIG. As an example, in Fig. 3, the magnetic tape is scanned by helical scanning onto the magnetic tape MT by the first rotating magnetic head Hv.
The position of the video track Tv formed on the magnetic tape MT and the position of the FM audio track Taf formed on the magnetic tape MT by the helical scan of the magnetic tape MT by the second rotary head Haf are the same as that of the magnetic tape MT.
What is shown as being gradually shifted with respect to the running direction
Pre-recorded magnetic tape with FM audio signals previously recorded by a second rotary head Haf
This can be done at completely different dates and times for the MT, so as an example, a recorded magnetic field in which the FM audio signal has been previously recorded by the second rotary head Haf at such completely different times can be used as an example. This is because it shows a recording trace pattern when a video signal is recorded on the tape MT by the first rotary head Hv. In other words, the magnetic tape MT has slight speed irregularities when running, and also expands and contracts to some extent when running, so there is a difference between the tracks formed on the magnetic tape MT at different times. In this case, a deviation occurs in the running direction On the other hand, by the second rotary head Haf mentioned above,
If the video signal is recorded by the first rotary head Hv at a time completely different from the time when the FM audio signal was recorded, a recording trace pattern such as the recording trace pattern shown in Fig. 3 will be created. This is easy to do. Therefore, the control head Hvc corresponding to the video track corresponds to the position of the video track Tv formed on the magnetic tape MT by the helical scan on the magnetic tape MT by the first rotary head Hv.
The control pulses are formed on the magnetic tape MT by the recording position of the control pulse in the control track Tcv corresponding to the video track recorded in the longitudinal direction of the magnetic tape MT by Corresponding to the position of the FM audio track Taf, the recording position of the control pulse in the FM audio track compatible control track Tcaf recorded in the longitudinal direction of the magnetic tape MT by the FM audio track compatible control head Hac is also shown in Figure 3. They will be shifted from each other as shown in . In the example shown in Figure 3, the video track compatible control track Tcv recorded in the longitudinal direction of the magnetic tape MT by the video track compatible control head Hvc is shown to have a track width of 0.75 mm, and is also compatible with FM audio tracks. The control track Tcaf corresponding to the FM audio track recorded in the longitudinal direction of the magnetic tape MT by the control head Hac is shown as having a track width of 0.3 mm, and there is a gap of 0.05 mm between the two control tracks. It is being In the embodiments of the magnetic recording and reproducing apparatus of the present invention described above with reference to FIGS. 1 to 3, a control head compatible with FM audio tracks is used.
Control track compatible with FM audio track recorded in the longitudinal direction of magnetic tape MT by Hac
Tcaf is a video track compatible control head.
The FM audio track compatible control head Hac is placed in parallel with the video track compatible control track Tcv, which is recorded in the longitudinal direction of the magnetic tape MT by Hvc, with a slight gap between the combination head and the FM audio track compatible control head Hac. 16, and also a control head compatible with video tracks.
The combination head 16 is provided with a video track compatible control track erasing head Hev for erasing the control pulses recorded on the video track compatible control track Tcv recorded in the longitudinal direction of the magnetic tape MT by Hvc. However, in implementing the magnetic recording and reproducing apparatus of the present invention, magnetic tape MT
A control track Tcaf for FM audio tracks that should be recorded in the longitudinal direction of the
As described in Japanese Patent No. 94952, it may be formed over the entire width of the magnetic tape MT. 4 to 6 show that the control track Tcaf corresponding to the FM audio track to be recorded in the longitudinal direction of the magnetic tape MT spans the entire width of the magnetic tape MT, as described in Japanese Patent Application Laid-Open No. 57-94952. A plan view of a magnetic tape running system (FIG. 4) and a combination head 17 in the case where the magnetic recording and reproducing apparatus of the present invention is implemented in such a manner that
A perspective view of a combination head (Fig. 5) showing the arrangement of each head in Fig. 4, and a recording trace pattern recorded and formed on a magnetic tape MT by the magnetic recording/reproducing apparatus having the configuration shown in Fig. 4 (Fig. 6). 4 to 6, the parts corresponding to the parts in FIGS. 1 to 3 already described are designated by the drawing symbols used in FIGS. 1 to 3. The same drawing symbols are used. In FIG. 4, Hact is configured such that a control track Tcaf corresponding to the FM audio track to be recorded in the longitudinal direction of the magnetic tape MT is formed over the entire width of the magnetic tape MT.
Although it is a control head compatible with FM audio tracks, the FM audio track compatible control head Hact shown in FIG. , a configuration in which the control head also serves as a full-width erase head may also be used. The track pattern recorded on the magnetic tape MT in the magnetic recording/reproducing apparatus of the present invention as shown in FIG. 4 is as shown in FIG.
Tcaf is a video track TV and FM audio track.
Since it overlaps with TAF, magnetic tape MT is controlled by Hac, a control head compatible with FM audio tracks.
When the recording level of the control signal corresponding to the FM audio track recorded in the longitudinal direction is high, the low frequency components of the signal to be recorded on the video track (for example, the signal in the low frequency conversion carrier color signal area...approximately 630KHz) (signal components in the frequency domain), and this distortion can cause problems such as color shading and unnecessary noise components on the playback screen. In order to prevent this from occurring, the above-mentioned JP-A-57-
The method described in Japanese Patent No. 94952 may be used. FIG. 7 is a block diagram of an embodiment of the magnetic recording/reproducing apparatus of the present invention, which is equipped with the magnetic tape running system shown in FIG. , i.e. full width erase head
Het, two rotary heads Haf, Haf (second rotary head Haf, Haf) for recording and reproducing FM audio signals, two rotary heads Hv, Hv for recording and reproducing video signals.
(first rotating head Hv, Hv), FM audio track compatible control head Hac, video track compatible control track erasing head Hev, video track compatible control head Hvc, audio track erasing head Hea, fixed audio head Ha, etc. This corresponds to the various magnetic heads already described with reference to the figures. magnetic head inside
This corresponds to using a magnetic head Hact instead of Hac, so illustrations and explanations thereof will be omitted.) In FIG. 7, reference numerals 18 and 19 are switching amplifiers, and the switching amplifier 18 switches between the two second rotary heads Haf and Haf attached to the rotary head drum 1. Two first rotary heads Hv, Hv attached to head drum 1
Perform the switching. In FIG. 7 described above, reference numeral 20 denotes an operating section, and this operating section 20 includes an input device such as a push button switch group, which allows the operator to specify various operating modes of the magnetic recording/reproducing apparatus as described below. Alternatively, it is equipped with a group of changeover switches, etc.
When the operator operates the input device in the operation unit 20 to designate the operation mode of the magnetic recording and reproducing device, the control circuit 21 controls the magnetic recording and reproducing device according to a signal sent from the operation unit 20 to the control circuit 21. The device supplies each component of the magnetic recording/reproducing device with a control signal that allows the device to operate in accordance with the operating mode specified by the operator at the operating section 20 described above. Further, in FIG. 7, 22 is a pseudo video signal generation source, 23 is an erasure signal source, and 24 is a servo circuit (53 to 56, 60, 72 to
74, 82, 89, etc. are shown in correspondence with each input and output terminal in FIG. 8 showing a detailed example configuration of the servo circuit 24), 25 is a recording signal generation circuit based on an FM audio signal, 26 27 is a video signal recording signal generation circuit, 28 is a video signal reproduction circuit, 29 is a normal audio signal recording signal generation circuit, and 30 is a normal audio signal playback circuit. 31, 32 are input terminals for audio signals to be recorded, 33, 34, 37
35 is an output terminal for a reproduced audio signal, 35 is an input terminal for a video signal to be recorded, 36 is an output terminal for a reproduced video signal, and 38,
39 is a recording amplifier, 40 and 41 are preamplifiers, 4
2 is a high frequency signal generator (for example, a 12MHz high frequency signal generator), 43 to 50 are changeover switches, 43a
~50a is a supply terminal for a switching control signal supplied from the control circuit 21, 51 is a capstan motor, and 52
is a pulse generator, DM is a drum motor that drives and rotates the rotary head drum 1, PG is a pulse generator, and FG is a frequency generator. A recording signal generation circuit 25 based on an FM audio signal;
FM audio signal reproduction circuit 26, video signal recording signal generation circuit 27, and video signal reproduction circuit 28
Although any arbitrary configuration may be used, in the example shown in FIG. 7, in the recording signal generation circuit 25 based on the FM audio signal, the noise reduction circuit NR→pre-emphasis circuit PE→limiter LM→frequency modulation From the circuit arrangement consisting of the device MDD → low-pass filter LPF → adder circuit ADD, the carrier wave with a frequency value of 1 is frequency-modulated by the audio signal, while the carrier wave of one channel is
FM audio signal can be obtained and noise reduction circuit
NRr → Pre-emphasis circuit PEr → Limiter
LMr→Frequency modulator MDDr→Low pass filter
From the circuit layout consisting of LPFr → adder circuit ADD,
Since the FM audio signal of the other channel is obtained by frequency modulating the carrier wave with a frequency value of 2 with the audio signal, the recording signal generation circuit 25 based on the FM audio signal illustrated in FIG. The output signal from the adder circuit ADD is transmitted through the recording amplifier 38 → the fixed contact Re of the changeover switch 44 → the movable contact v → the switching amplifier 18. The data is supplied to the second rotary heads Haf and recorded on the magnetic tape MT. The above-mentioned FM audio signals with center frequencies of 1 and 2 are transmitted to the first rotary head Hv, as described later.
The occupied band of the frequency modulated wave by the luminance signal and the occupied band of the low-pass converted carrier chrominance signal in the frequency multiplexed signal of the frequency modulated wave by the luminance signal and the low-pass converted carrier chrominance signal recorded and reproduced by Hv. The frequency value of the carrier wave described above is set so that the frequency modulated wave by the audio signal occupies the intermediate part of the carrier wave.
1 and 2 have been selected. Further, the FM audio signal reproducing circuit 26 having the configuration example shown in the figure is configured such that the FM audio signal reproduced from the magnetic tape MT by the second rotary heads Haf is transmitted from the switching amplifier 18 to the changeover switch 44.
The movable contact v→the fixed contact P→when supplied to it through the circuit of the preamplifier 40, the frequency f1
Bandpass filter BPF with center frequency → Frequency demodulator DEM → Hold circuit HOLD → De-emphasis circuit DE → Reduced pass filter LPF
→ A circuit consisting of a noise reduction circuit NR demodulates and reproduces the reproduced FM audio signal of one channel, outputs it to the output terminal 33, and outputs it to the output terminal 33.
Bandpass filter BPFr with f2 as the center frequency → Frequency demodulator DEMr → Hold circuit HOLDr → De-emphasis circuit DEr → Reduced pass filter LPFr →
The reproduced FM audio signal of one channel is demodulated and reproduced by a circuit consisting of a noise reduction circuit NRr.
It is output to the output terminal 34. The video signal recording signal generation circuit 27 generates a video signal to be recorded, which is applied to the input terminal 33, such that a carrier color signal, for example, is band-sharing multiplexed with the luminance signal within the band of the luminance signal. video signal (for example, the so-called NTSC system decoded color
The device is configured to output a TV video signal (TV video signal) as a frequency multiplexed signal of a frequency modulated wave by a luminance signal and a low frequency converted carrier color signal. Also,
The video signal generated by the video signal recording signal generation circuit 27 is supplied to the servo circuit 24, where a vertical synchronizing signal is extracted as described later, and then a control pulse is generated to control the generated control signal. Pulse selector switch 46,4
8 fixed contact Re. The output signal from the video signal recording signal generating circuit 27 is supplied to the first rotary heads Hv, Hv via the recording amplifier 39 → fixed contact Re of the changeover switch 45 → movable contact v → switching amplifier 19. Then, the video signal is recorded on the magnetic tape MT. The video signal tracks recorded on the magnetic tape MT by the first rotary heads Hv, Hv are
FM audio track recorded on the magnetic tape MT by the TV and the second rotary head Haf.
The records with Taf are as shown in Figures 3 and 6, respectively. The audio signal supplied to the audio signal input terminal 31 is converted into an audio signal recording signal in a normal audio signal recording signal generation circuit 29 that includes, for example, an amplitude modulator, and is then turned on to the selector switch 50. When the fixed contact Re is supplied to the fixed audio head Ha via the movable contact v, the magnetic tape MT receives the recording signal shown by Ta in FIGS. 3 and 6. An audio track Ta of a normal audio signal is recorded. Next, among the various erasing heads Het, Hev, and Hea used in the magnetic recording/reproducing device, the full-width erasing head Het receives an erasing signal (erasing current) from the erasing signal source 23. In this case, it operates to erase any records already recorded on the magnetic tape MT. Furthermore, when the video track compatible control track erasing head Hev is given an erasing signal (erasing current) from the erasing signal source 23, it erases the control signal already recorded on the video track compatible control track of the magnetic tape MT. Furthermore, when the audio track erasing head Hea is given an erasing signal (erasing current) from the erasing signal source 23, the audio track erasing head Hea erases the magnetic tape.
It operates to erase the audio signal already recorded on the MT's audio track Ta. The manner in which signals are supplied to the various magnetic heads as described above provided in the magnetic recording/reproducing apparatus is shown in FIG. The switching mode of the movable contacts of the changeover switches 43 to 50 and the eighth
The values change as shown in Table 1 below, depending on the switching mode of the movable contact of the changeover switch 57 shown in the figure.

[Table] In Table 1 above, operation mode number 1
-8 are numbers for distinguishing between the typical eight types of operation modes illustrated in Table 1, and the indications of changeover switches 43 to 50 in Table 1 are shown in FIG. The changeover switches 43 to 50 corresponding to the changeover switches 43 to 50 shown in FIG. 57 is shown. Furthermore, in Table 1, Re, D, E, Rv,
Displays such as Ra indicate which of the fixed contacts of each changeover switch 43 to 50, 57 is in a switching manner such that it comes into contact with the movable contact v in each operating mode. . The operating mode shown as operating mode 1 in Table 1 is that the magnetic recording/reproducing apparatus of the embodiment of the present invention shown in FIG.
This is an operation mode that operates in the same manner as a magnetic recording and reproducing device that follows the Fi method.
In this operation mode 1, the changeover switch 4
6 and 47 are in a switching manner such that their movable contacts v are brought into contact with fixed contacts E, and changeover switches 43 to 45 and changeover switches 48 to 50 are
The switching mode is such that the movable contacts v are in contact with the fixed contacts Re, and the changeover switch 57 is also in a switching mode such that its movable contacts v are in contact with the fixed contacts Rv. The manner in which signals are recorded on the MT is the same as when a magnetic recording/reproducing device operates according to the conventional VHS Hi-Fi system, and the magnetic tape MT is transferred from the erase signal source 23 to the fixed contact Re of the changeover switch 43.
After all previously recorded information is erased by means of an erase signal supplied to the full-width erase head Het via a movable contact v and a second rotary head Haf,
FM by Haf and the first rotating head Hv, Hv
An audio signal and a video signal are recorded, and the video signal is transmitted from the recording signal generation circuit 27 to the servo circuit 24.
The servo circuit 24
Control pulses generated within the magnetic tape MT are recorded on the magnetic tape MT by a control head Hvc corresponding to a video track. The control pulses described above are generated in the servo circuit 24 in the following manner. That is, the video signal supplied from the video signal recording signal generation circuit 27 to the input terminal 53 of the servo circuit 24 in FIG.
The vertical synchronization signal is separated by being applied to the vertical synchronization signal separation circuit 58 via Rv and the movable contact v, and the frequency of the separated vertical synchronization signal is divided by 1/2 by the frequency divider 59. A control pulse is generated by the . The control pulses generated as described above are supplied to the video track corresponding control head Hvc via the fixed contact Re and the movable contact V of the changeover switch 48, and are recorded on the magnetic tape MT. Further, on the above-mentioned magnetic tape MT, an audio signal is recorded which is supplied from the audio signal recording signal generation circuit 29 to the fixed audio head Ha via the fixed contact Re and the movable contact v of the changeover switch 50. . Therefore, the magnetic tape MT has a video track Tv by the first rotary head Hv, an FM audio track Taf by the second rotary head Haf, a video track compatible control track Tvc by the video track compatible control head Hvc, and a fixed video track Tv. An audio track Ta is recorded by the audio head Ha. This operation mode 1 indicates that the magnetic recording/reproducing apparatus of the present invention has complete compatibility with the conventional magnetic recording/reproducing apparatus using the VHS Hi-Fi system. Next, in the operation mode shown as operation mode 2 in Table 1, the magnetic tape MT is transferred from the erase signal source 23 to the fixed contact Re of the changeover switch 43.
After all previously recorded information is erased by means of an erase signal supplied to the full-width erase head Het via a movable contact v and a second rotary head Haf,
Haf converts the FM audio signal to the FM audio track Taf.
recorded in Further, the pseudo video signal generated by the signal source 22 of the pseudo video signal is transferred to the magnetic tape MT via the input terminal 54 of the servo circuit 24 and the fixed contact Ra and movable contact V of the changeover switch 57 to the vertical synchronizing signal separation circuit. 58, the vertical synchronizing signal is separated, and the frequency of the separated vertical synchronizing signal is divided by 1/2 by the frequency divider 59, thereby generating a control pulse. By being supplied to the FM audio track compatible control head Hac via the fixed contact Re and the movable contact v, an FM audio track compatible control track Tcaf is recorded on the magnetic tape MT. Furthermore, the audio signal being supplied to the fixed audio head Ha from the audio signal recording signal generation circuit 29 via the fixed contact Re and the movable contact v of the changeover switch 50 is recorded on the audio track Ta. The operating modes shown as operating mode 3 and operating mode 4 in Table 1 are the operating modes 2 and 4 described above.
Operation mode 3 is a modified operation mode in which recording of audio signals by the fixed audio head Ha, which was done in operation mode 2, is not performed, and operation mode 4 is a modification of operation mode 3. Similar to operation mode 3 above, the fixed audio head that was used in operation mode 2
The movable contact v of the changeover switch 45 is prevented from being recorded by the audio signal Ha.
is switched so as to contact the fixed contact Rd, so that the high frequency signal generated by the high frequency signal generator 42 is supplied to the first rotary head Hv, Hv, and the second rotary head Haf, The recording of the FM audio signal that was previously recorded on the FM audio track Taf by Haf is transferred to the first rotary head.
This is an operation mode in which Hv and Hv are demagnetized to a required degree by the high frequency signal supplied to the Hv, and the reproduction signal level is set to a required level. The operating modes 2 to 4 described above are operating modes in which the second rotary heads Haf, Haf record the FM audio signal on the FM audio track Taf, and substantially do not record any signal on the video track Tv. Thus, the magnetic tape MT with the FM audio signal recorded on the FM audio track Taf in operation modes 2 to 4 plays back the control signal recorded on its FM audio track compatible control track Tcaf. It can be used for time tracking and allows for good reproduction of FM audio signals. In the above operation mode 4, after recording the FM audio signal by the second rotary heads Haf, Haf, the FM audio is recorded by the high frequency signal from the high frequency signal generator 42 applied to the first rotary head Hv, Hv. The reason for demagnetizing recording during a track is as follows. That is, the recording operation in a normal VHS Hi-Fi type magnetic recording and reproducing device is as shown in operation mode 1 in Table 1, and the recording operation is as shown in operation mode 1 in Table 1. truck
The FM audio signal recorded on the TAF is demagnetized by about 14 dB during the overwriting recording of the video signal in the first rotary head Hv, Hv immediately after that, so the current VHS Hi- Fi-type magnetic recording and reproducing devices use FM audio tracks Taf.
For the above-mentioned reason, the circuit configuration of the related parts is such that the reproduction signal level of the FM audio signal reproduced from the FM audio signal is 14 dB lower. Therefore, operating mode 2 or operating mode 3
When an FM audio signal recorded on a magnetic tape MT is played back as is by a current VHS Hi-Fi magnetic recording/playback device,
The playback signal level of the FM audio signal is higher than the standard value.
It is conceivable that this could become 14 dB higher and cause a malfunction in circuit operation. Therefore, in operation mode 4, the second rotating head
After recording the FM audio signal with Haf, Haf,
The FM audio signal recorded in the FM audio track is demagnetized to a required degree by the high frequency signal from the high frequency signal generator 42 applied to the first rotary heads Hv, Hv, thereby solving the above problem. This was done to prevent any damage from occurring. For the reasons mentioned above, the high frequency signal generator 42 causes the first rotary head Hv,
The high frequency signal given to the Hv is the magnetic tape
If recorded on MT, there is a risk of interference when the video signal is recorded later.
The high frequency signal mentioned above is magnetic tape.
By using a high frequency signal that cannot be recorded on the MT (for example, a 12 MHz high frequency signal), the FM audio signal recorded in the FM audio track can be adjusted to the required degree (for example, by the high frequency signal described above).
The size is such that it can be demagnetized (approximately 6 dB). In operation modes 5 and 6 in Table 1, the first rotary heads Hv and Hv perform video and video operations on the magnetic tape MT on which FM audio signals have been recorded in the above-mentioned operation modes 2 to 4. Operation mode 5 is an operation mode for recording signals.
Now, a video signal is overwritten by the first rotary heads Hv, Hv onto the FM audio track Taf recorded on the magnetic tape MT, and the already recorded audio signal recorded on the audio track Ta is overwritten as an audio signal. This is a case where a new audio signal is recorded using a fixed audio head Ha after the track is erased using the track erasing head Hea, and
In operation mode 6, the first rotary head is connected to the FM audio track Taf recorded on the magnetic tape MT.
This is an operation mode in which the video signal is overwritten by Hv and Hv, and the already recorded audio signal recorded on the audio track Ta is left as is. By the way, recording of signals on one roll of magnetic tape MT is not performed in the same operating mode from beginning to end. For example, recording of signals on magnetic tape MT is initially performed in operation mode 2 in Table 1 below. If the recording operation from the middle of the magnetic tape is performed in operation mode 1 in Table 1, the recording operation is performed in operation mode 5 in Table 1 from the beginning of the magnetic tape. Considering the case where a video signal is recorded according to the above-mentioned operation mode 2, no problem will occur for the part already recorded on the magnetic tape MT that follows the above-mentioned operation mode 2. If the current recording operation mode is 5 and the full width erase head is
Magnetic tape because het is in inoperative state
When the portion already recorded on the MT reaches the portion conforming to the first operation mode described above, interference will occur in the video signal. Therefore, in order to avoid the above-mentioned inconvenience, when the operation mode in Table 1 is 5 or 6,
The FM audio track compatible control head Hac allows the FM audio track compatible control track Tcaf to reproduce control pulses, and when the control pulse is not detected, the operating modes 5 and 6 at that time are activated. The mode is automatically changed to mode 1. For this reason, in the configuration example shown in FIG. 7, when the operating mode is 5 or 6, the movable contact v of the changeover switch 46 is connected to the fixed contact D, so that the FM audio track is reproduced by the control head Hac. The control circuit 21 is configured to be able to detect the presence or absence of a control pulse, and when the control pulse reproduced by the FM audio track compatible control head Hac disappears, the control circuit 21 selects the operating mode 5 or 6 at that time. is automatically changed to operation mode 1. The operating modes shown as operating mode 7 and operating mode 8 in Table 1 are slightly different in character from the operating modes described above as operating mode 1 to operating mode 6. First, in operation mode 7, selector switches 43 to 5
All the movable contacts v of 0 are switched to the fixed contact Re side, and the changeover switch 57 is switched to the fixed contact Rv side, and the magnetic tape MT is erased. From the signal source 23 to the fixed contact Re of the changeover switch 43
After all previously recorded information is erased by means of an erase signal supplied to the full-width erase head Het via a movable contact v and a second rotary head Haf,
Haf converts the FM audio signal to the FM audio track Taf.
are recorded in the first rotary head Hv,
The video signal is recorded on the video track Tv by Hv, and the video signal generated by the video signal recording signal generation circuit 27 is transferred from the input terminal 53 of the servo circuit 24 to the fixed contact Rv of the changeover switch 57 to the same By being supplied to the vertical synchronizing signal separating circuit 58 via the movable contact v, the vertical synchronizing signal separating circuit 58
The frequency dividing circuit 59 divides the vertical synchronization signal into 1/2
The control pulse obtained by frequency division is passed through the fixed contact Re and the movable contact v of the changeover switch 46,
FM audio track compatible control head Hac is supplied with FM audio compatible control track.
At the same time as recording and forming Tcaf, the control pulse is also supplied to the video track compatible control head Hvc via the fixed contact Re and movable contact v of the changeover switch 48, and the video track compatible control track Tcv is also recorded and formed. Ru. In operation mode 7 and operation mode 8, which will be described later, after the second rotary heads Haf, Haf record the FM audio signal, the first rotary heads Hv, Hv subsequently record the video signal. are recorded so that the recording traces of the two signals described above overlap. Next, in operation mode 8, the above-mentioned operation mode 7
In the recording operation, the movable contact v of the changeover switch 45 is connected to the fixed contact Rd, and the high frequency signal generated by the high frequency signal generator 42 is applied to the first rotating heads Hv, Hv. be. In operation mode 7 and operation mode 8 shown in Table 1, the movable contacts v of the changeover switches 49 and 50 are switched to the fixed contact Re side, and the audio signal recording signal generation circuit The audio signal supplied from 29 to the fixed audio head Ha is recorded on the audio track Ta, but the movable contacts v of the changeover switches 49 and 50 are switched to the fixed contact E side. The recording of audio signals by the audio head Ha may be prevented. In the explanation so far, we have not mentioned the running speed of the magnetic tape MT, but each of the above operating modes can be performed in SP mode (recording/playback mode at standard tape running speed) or EP mode. (Recording/playback mode with tape running speed 1/3 of standard tape running speed)
For example, after a recording operation in operation mode 1 is performed in SP mode, a recording operation in operation mode 5 is performed in EP mode, or a recording operation in operation mode 1 is performed in EP mode. After the recording operation is performed in operation mode 5, the recording operation in operation mode 5 may be performed in SP mode. As can be seen from the typical operation modes during recording in the magnetic recording/reproducing apparatus of the present invention explained with reference to Table 1, in the magnetic recording/reproducing apparatus of the present invention, the full width erase heads Het, the first, The manner of supplying signals to the second rotary heads Hv, Haf, the control head Hvc for video tracks, the control head Hac for FM audio tracks, the control track erasing head Hev for video tracks, the fixed audio head Ha, and the other heads, respectively. For magnetic tape MT, by changing according to the operating mode of
It is possible to record only FM audio signals, to record only video signals and narrowband audio signals (operating modes not shown in Table 1), or to record FM audio signals in advance. It is possible to record by overwriting video signals on a magnetic tape MT, which is only used for recording, and to record signals in various other ways. By changing the manner in which control pulses are recorded by the track compatible control head Hvc and the FM audio track compatible control head Hac, depending on the type of control pulse obtained during playback,
It is also possible to easily distinguish in what operating mode recording was performed. Next, when the magnetic recording and reproducing apparatus is put into the reproducing mode, the movable contacts v in the changeover switches 43, 47, 49, etc. are switched to the E side, and the full width erasing head Het and the control track erasing corresponding to the video track are erased. The head Hev, the audio track erase head Hea, etc. are made inoperative, and the movable contacts V in the changeover switches 44, 45, 46, 48, 50, 61, etc. are switched to the fixed contact P side, and the first and second Respective playback signals are given to subsequent circuits from the rotary heads Hv and Haf, the control head Hac for FM audio tracks, the control head Hvc for video tracks, and the fixed audio head. The reproduction signals from the first rotary heads Hv, Hv are
Switching amplifier 19 -> Movable contact v of changeover switch 45 -> Fixed contact P -> Provided to the video signal reproducing circuit 28 via the preamplifier 41, where the video signal is restored and reproduced and output. The signal is sent to terminal 36. Furthermore, the reproduced signals from the second rotary heads Haf, Haf are transmitted through the switching amplifier 18 → the movable contact v of the changeover switch 44 → the fixed contact P → the preamplifier 4.
0 to the FM audio signal reproducing circuit 26, where the FM audio signal is restored and reproduced as described above and output to the output terminal 3.
3 and 34. Furthermore, the output signal from the fixed audio head Ha is given to the normal audio signal reproducing circuit 30 via the movable contact v → the fixed contact P of the changeover switch 50. A normal audio signal is restored and reproduced and sent to the output terminal 37. The control pulses reproduced by the FM audio track compatible control head Hac in the playback mode are transferred to the movable contact v and fixed contact P of the changeover switch 46.
The control pulses are applied to the input terminal 73 of the servo circuit 24 via the input terminal 73 of the servo circuit 24 and reproduced by the video track compatible control head Hvc. It is applied to input terminal 74. The servo circuit 24 receives the aforementioned reproduction control pulses, pulses generated by the pulse generator 52, pulses generated in response to the rotation of the rotary head drum (pulses generated by the pulse generator PG, frequency generator FG, etc.), etc. make use of,
Drum motor that drives and rotates the rotating head drum 1
Automatic control of the rotational speed and rotational phase of the DM (automatic control of the rotational speed and rotational phase of the rotary head by the drum servo system) and automatic control of the rotational speed and rotational phase of the capstan motor 51 (automatic control of the rotational speed and rotational phase of the capstan motor 51 (magnetic tape running). (automatic control of the running speed of the magnetic tape in the system). FIG. 8 shows a block diagram of an example of the configuration of the servo circuit 24, and the servo circuit 24 shown in FIG. 8 also generates control pulses as described above. That is, in FIG. 8, 58 is a vertical synchronizing signal separation circuit as described above, 59 is a frequency dividing circuit, and the control pulse output from the frequency dividing circuit 59 is used as a servo control pulse as described above. It is supplied to the fixed terminals Re of the changeover switches 46 and 48 via the output terminal 60 of the circuit 24, and when the magnetic recording/reproducing apparatus is set to the recording mode, the changeover switch 4 is activated as described above.
6 and 48, the data is recorded on the magnetic tape MT by one or both of the FM audio track compatible control head Hac and the video track compatible control head Hvc. In FIG. 8, 57, 61, 75, 77, etc. are changeover switches, and 57a, 61a,
Reference numerals 75a, 77a, etc. are terminals for supplying switching control signals to the aforementioned switching switches. The magnetic recording/reproducing device is in the recording mode, and the movable contact v of the changeover switch 61 is the fixed contact.
In the state where the control pulse is switched to the Re side, the control pulse described above is also applied to the monostable multivibrator 62 of the drum servo system. Further, when the magnetic recording/reproducing apparatus is set to the reproduction mode, the movable contact v of the changeover switch 61 is switched to the fixed contact P side, and the control pulse generated by the reference pulse source 93 is transferred to the drum servo system described above. It is supplied to the monostable multivibrator 62. The monostable multivibrator 62 described above generates a predetermined delay pulse, and the output pulse thereof is given to a sampling pulse generation circuit 63.
The sampling pulse output from the sampling pulse generation circuit 63 is sent to the sample hold circuit 64.
is given to. The sample hold circuit 64 has a pulse generator connected to the input terminal 55 of the servo circuit 24.
The pulses supplied from the PG are sent to the waveform shaping circuit 65.
The trapezoidal wave generated by the trapezoidal wave generating circuit 66 is given to the trapezoidal wave generating circuit 66 after being shaped into a waveform by A phase error signal is provided to a differential amplifier 70. The pulses supplied from the frequency generator FG to the input terminal 56 of the servo circuit 24 are amplified by the amplifier 67, then waveform-shaped by the waveform shaping circuit 68, and then given to the disc liminator 69. In this case, the speed error signal in the drum servo system is transmitted to the differential amplifier 70.
is supplied to The output signal of the differential amplifier 70 described above is amplified by the drum motor drive amplifier 71 and sent to the output terminal 72.
By being supplied to the drum motor DM via the drum servo system, the drum servo system automatically controls the speed and phase of the rotary head both in recording mode and in playback mode. The parts indicated by drawing numbers 73 to 92 in FIG. 8 are the capstan servo system, 73 is the input terminal for the control pulses reproduced by the FM audio compatible control head Hac, and 74 is the video compatible control head Hvc. The above input terminal 73 is an input terminal for the regenerated control pulse.
The control pulse supplied to is given to the fixed contact ac of the changeover switch 75, and
The control pulse supplied to the input terminal 74 is also supplied to a fixed contact VC of a changeover switch 75, and the control pulse is supplied to a circuit 90 for determining the running speed of the magnetic tape. It is also provided to the determination circuit 91 of. The magnetic tape running speed determining circuits 90 and 91 determine the speed of the magnetic tape during recording based on the output pulse of the pulse generator 52 supplied to the input terminal 82 and the control pulse described above.
It sends out an output signal depending on whether the MT running speed is SP mode or EP mode, and gives it to the discriminator 86 to control the magnetic tape MT during playback.
The running speed of the magnetic tape is made to match the running speed of the magnetic tape during recording. Further, the output signals of the magnetic tape running speed determination circuits 90 and 91 described above are also given to the control circuit 21 and used for control operations in the control circuit 21. Since the movable contact v of the changeover switch 75 is connected to the input side of the amplifier 76, the aforementioned control pulse is amplified by the amplifier 76 and then applied to the fixed contact P of the changeover switch 77. The fixed contact Re of the changeover switch 77 is connected to the pulse generator 52.
The output pulse of the pulse generator 52, which is supplied to the input terminal 82 described above, is amplified by an amplifier 83 and then divided by a frequency divider 84 to provide a pulse. The output pulse of the amplifier 83 described above is also supplied to a waveform shaping circuit 85, and the pulse shaped by the waveform shaping circuit 85 is supplied to a discriminator 86. The output signal from the discriminator 86 described above is sent to the DC amplifier 8.
7 and then applied to a differential amplifier 88 as a speed error signal in the capstan servo system. The signal output from the movable contact v of the changeover switch 77 is waveform-shaped by a waveform shaping circuit 78 and then supplied to a sample hold circuit 79. The sample and hold circuit 79 is also provided with a trapezoidal wave generated by a trapezoidal wave generation circuit 81 based on the pulses generated by a reference pulse generator 80. A phase error signal at is output and applied to the differential amplifier 88. The output signal of the differential amplifier 88 described above is amplified by the capstan motor drive amplifier 92 and supplied to the capstan motor 51 via the output terminal 89, so that the capstan servo system can operate in the recording mode and To automatically control the running speed of a magnetic tape in both playback modes. As can be seen from the examples of operation modes shown in Table 1, in the magnetic recording/reproducing apparatus of the present invention, the control pulses are set to a control track Tcv corresponding to a video track and a control track Tcaf corresponding to an FM audio track according to each operation mode. The control pulses obtained during reproduction are used for tracking servo as follows. That is, if the control pulse is reproduced from only one of the control track Tcv corresponding to the video track and the control track Tcaf corresponding to the FM audio track, the reproduced control pulse is used for the tracking servo, In addition, operation mode 2 in Table 1
When the tracking pulse is reproduced from both the video track compatible control track Tcv and the FM audio track compatible control track Tcaf by reproducing the signal recorded in steps 4 to 4, it is considered as the target of reproduction at that time. A control pulse reproduced from a control track provided corresponding to the signal track is used for the tracking servo,
Furthermore, by reproducing the signals recorded in operation modes 7 and 8 in Table 1, the control pulse becomes the control track Tcv corresponding to the video track.
FM audio track compatible control track Tcaf
When the control pulses are reproduced from both the control track and the control pulse, the control pulses reproduced from either control track can be arbitrarily used for the tracking servo. (Effects) As is clear from the above detailed explanation, the magnetic recording and reproducing apparatus of the present invention records and reproduces a frequency multiplexed signal of a frequency modulated wave by a luminance signal and a low frequency converted carrier color signal. a rotating head;
a second rotary head for recording and reproducing a frequency modulated wave by an audio signal that occupies an intermediate portion between the band occupied by the frequency modulated wave by the luminance signal and the band occupied by the low frequency conversion carrier chrominance signal; 1st
a control track corresponding to a video track set in the longitudinal direction of the magnetic tape at a first position of the magnetic tape corresponding to the position of the video track formed on the magnetic tape by helical scanning of the magnetic tape by a rotating head of the magnetic tape; A control head corresponding to a video track for recording and reproducing pulses and a second rotary head on the magnetic tape correspond to the position of the FM audio track formed on the magnetic tape by helical scanning of the magnetic tape by the second rotary head. An FM audio track compatible control head that records and plays back control pulses on an FM audio track compatible control track set in the longitudinal direction of the magnetic tape at a position, and a fixed audio head that records and plays audio signals in the longitudinal direction of the magnetic tape. a full-width erasing head for erasing previously recorded data over the entire width of the magnetic tape at a position preceding the recording portion on the magnetic tape by the first and second rotating heads; The magnetic recording/reproducing apparatus of the present invention includes a full-width erasing head Het, first and second rotary heads Hv, Haf, and a control head corresponding to the video track. Hvc, FM audio track compatible control head Hac, fixed audio head Ha, and other heads can be supplied with signals that are changed according to their respective operating modes. FM
It is possible to record only audio signals, to record only video signals and narrowband audio signals, or to record only FM audio signals on a magnetic tape MT on which only FM audio signals have been recorded. In addition to recording by overwriting signals or recording signals in various other ways, depending on the operation mode, control can be performed using the video track compatible control head Hvc or the FM audio track compatible control head Hac. By changing the way pulses are recorded, the type of control pulse obtained during playback can be changed.
It is easy to distinguish which operating mode was used for recording, and
The tracking servo is automatically switched according to the running speed of the magnetic tape, so that a good reproduction operation can always be performed.

[Brief explanation of drawings]

1 and 4 are plan views of magnetic tape running systems in different embodiments of the magnetic recording and reproducing apparatus of the present invention, FIGS. 2 and 5 are perspective views of a combination head, and FIGS. FIG. 6 is a plan view showing a recording trace pattern on a magnetic tape, FIG. 7 is a block diagram of a magnetic recording/reproducing apparatus of the present invention, and FIG. 8 is a block diagram of an example of a servo circuit. DESCRIPTION OF SYMBOLS 1... Rotating head drum, 16, 17... Combination head, 18, 19... Switching amplifier, 20... Operating unit, 21... Control circuit,
22...Pseudo video signal source, 23...Elimination signal source,
24... Servo circuit, 25... Record signal generation circuit based on FM audio signal, 26... FM audio signal playback circuit, 27... Video signal recording signal generation circuit, 28... Video signal playback circuit, 29... Normal audio signal recording signal generation circuit, 30... Normal audio signal reproducing circuit, 31, 32... Audio signal input terminal to be recorded, 33, 34, 3
7...Output terminal for the reproduced audio signal, 35...
Input terminal for video signal to be recorded, 36...
...Output terminals for reproduced video signals, 38, 39...
... Recording amplifier, 40, 41 ... Preamplifier, 42
...High frequency signal generator, 43-50, 57, 6
1, 75, 77...Switch switch, 43a-50
a, 57a, 61a, 75a, 77a... supply terminals for switching control signals supplied from the control circuit 21;
51...Capstan motor, 52...Pulse generator, Het...Full width erase head, Haf, Haf...
The second rotary head (2 for recording and reproducing FM audio signals)
Hv, Hv...first rotary head (two rotary heads for recording and reproducing video signals),
Hac... Control head compatible with FM audio tracks, Hev... Control track erase head compatible with video tracks, Hvc... Control head compatible with video tracks, Hea... Audio track erase head, Ha... Fixed audio head, DM... Drums Motor, PG...Pulse generator, FG...Frequency generator.

Claims (1)

[Scope of Claims] 1. A first rotary head for recording and reproducing a frequency multiplexed signal of a frequency modulated wave by a luminance signal and a low frequency conversion carrier color signal, and an occupied band of the frequency modulated wave by the luminance signal. a second rotary head for recording and reproducing a frequency modulated wave by an audio signal that occupies an intermediate portion between the frequency band occupied by the low frequency conversion carrier color signal; and a helical scan onto the magnetic tape by the first rotary head. a video track compatible control for recording and reproducing control pulses on a video track compatible control track set in the longitudinal direction of the magnetic tape at a first position of the magnetic tape, corresponding to the position of the video track formed on the magnetic tape by the head and the second
FM set in the longitudinal direction of the magnetic tape at a second position of the magnetic tape, corresponding to the position of the FM audio track formed on the magnetic tape by helical scanning onto the magnetic tape by the rotating head of the
An FM audio track compatible control head that records and reproduces control pulses on the audio track compatible control track, a fixed audio head that records and reproduces audio signals in the longitudinal direction of the magnetic tape, and a magnetic head that uses the first and second rotary heads. A full-width erasing head for erasing previously recorded portions over the entire width of the magnetic tape is provided at a position preceding the recorded portion on the tape, and means for controlling the supply of signals to each of the heads. Magnetic recording and reproducing device. 2. A first rotary head for recording and reproducing a frequency multiplexed signal of a frequency modulated wave by a luminance signal and a low frequency converted carrier color signal, and an occupied band of the frequency modulated wave by the luminance signal and a low frequency converted carrier color signal. A second rotary head records and reproduces a frequency-modulated wave by an audio signal that occupies an intermediate portion between the occupied band of the signal and the first rotary head that performs a helical scan on the magnetic tape. a video track compatible control head for recording and reproducing control pulses on a video track compatible control track set in the longitudinal direction of the magnetic tape at a first position of the magnetic tape, corresponding to the position of the video track; Second
FM set in the longitudinal direction of the magnetic tape at a second position of the magnetic tape, corresponding to the position of the FM audio track formed on the magnetic tape by helical scanning onto the magnetic tape by the rotating head of the
An FM audio track compatible control head that records and reproduces control pulses on the audio track compatible control track, a fixed audio head that records and reproduces audio signals in the longitudinal direction of the magnetic tape, and a magnetic head that uses the first and second rotary heads. A full-width erasing head for erasing previously recorded portions over the entire width of the magnetic tape is provided at a position preceding the recorded portion on the tape, and means for controlling the supply of signals to each of the heads. In a magnetic recording/reproducing device, when a control head compatible with an FM audio track is reproducing control pulses, it is important to check whether the signal to be reproduced is from the FM audio track or from the video track. The tracking servo is controlled by the control pulses played by the respective control heads according to the FM audio tracking control head, and when the FM audio tracking control head is not playing control pulses, the video tracking control automatically starts. A magnetic recording/reproducing device provided with a switching means for using a control pulse reproduced by a head for tracking control. 3. A first rotary head for recording and reproducing a frequency multiplexed signal of a frequency modulated wave by a luminance signal and a low frequency converted carrier color signal, and an occupied band of the frequency modulated wave by the luminance signal and a low frequency converted carrier color signal. A second rotary head records and reproduces a frequency-modulated wave by an audio signal that occupies an intermediate portion between the occupied band of the signal and the first rotary head that performs a helical scan on the magnetic tape. a video track compatible control head for recording and reproducing control pulses on a video track compatible control track set in the longitudinal direction of the magnetic tape at a first position of the magnetic tape, corresponding to the position of the video track; 2
FM set in the longitudinal direction of the magnetic tape at a second position of the magnetic tape, corresponding to the position of the FM audio track formed on the magnetic tape by helical scanning onto the magnetic tape by the rotating head of the
An FM audio track compatible control head that records and reproduces control pulses on the audio track compatible control track, a fixed audio head that records and reproduces audio signals in the longitudinal direction of the magnetic tape, and a magnetic head that uses the first and second rotary heads. A full-width erasing head for erasing previously recorded portions over the entire width of the magnetic tape is provided at a position preceding the recorded portion on the tape, and means for controlling the supply of signals to each of the heads. A magnetic recording/reproducing device comprising means for automatically detecting the running speed of a magnetic tape based on a control pulse used for reproduced tracking servo and switching the tracking servo operation.