JPH0479695A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the lowering of the frequency band of carrier chrominance components by fetching synthesized recording signals from a magnetic tape by means of a magnetic head section. CONSTITUTION:At an adding section 35, FM luminance signals Yf from an HPF 34, low frequency band chrominance components Cc from a BPF 37, FM sound signals Af from a BPF 40, and pilot signal components P1-P4 from an LPF 46 are synthesized under a frequency multiplexed condition and synthesized recording signals Sm are formed. The signals Sm obtained from the section 35 are supplied to rotary magnetic heads 51a and 51b respectively through record amplifying sections 49 and 50. The heads 51a and 51b alternately scan a magnetic tape. Therefore, the occurrence of such a trouble that the frequency band of carrier chrominance components for recording contained in the synthesized recording signals is lowered by a trap circuit for removing pilot signals can be eliminated.

Description

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

Industrial application field Overview of the invention Conventional technology Problems to be solved by the invention Means for solving the problems Example c-1 Recording system (Figs. 1 and 2) G-2 Reproducing system (Fig. 3) Figure) G-3 Modification H Effect of the Invention A Industrial Field of Application The present invention provides a signal obtained by frequency multiplexing and combining a luminance signal and a chrominance signal forming a video signal with a pilot signal used for tracking control during playback, etc. Record the composite recording signal obtained on a magnetic tape, extract the composite recording signal from the magnetic tape, obtain a pilot signal from the obtained composite recording signal, and generate a luminance signal and a color signal based on the obtained composite recording signal. The present invention relates to a magnetic recording/reproducing device for reproduction.

B. Summary of the Invention The present invention provides a recording carrier color signal, a recording luminance signal which is a frequency modulated signal occupying a frequency band higher than the frequency band thereof, and a pilot signal having a frequency close to the frequency band of the recording carrier color signal. A recording system that records a composite recording signal that is frequency-multiplexed and included on a magnetic tape, and extracts the composite recording signal from the magnetic tape on which the composite recording signal is recorded, and extracts a pilot signal from the resulting composite recording signal. In a magnetic recording and reproducing apparatus, the recording system is equipped with a reproduction system that obtains a reproduction luminance signal and a reproduction color signal based on a recording luminance signal and a recording carrier color signal included in the obtained composite recording signal. is provided with a pilot signal forming section that obtains a pilot signal by performing phase reset processing with a vertical period in the recording luminance signal, and a reproduction system that has the same frequency as the pilot signal and has a magnetic head section. a cancellation signal forming unit that obtains a cancellation signal in which a phase reset process is performed with a vertical period in a recording luminance signal included in a composite recording signal from a magnetic head; and a cancellation signal from a composite recording signal from a magnetic head unit. and a pilot signal canceling section that subtracts the pilot signal included in the composite recording signal from the magnetic head section, and the recording luminance signal and the recording carrier color signal included in the signal obtained from the pilot signal canceling section. By obtaining the reproduced luminance signal and the reproduced color signal based on the composite recording signal from the magnetic head unit in the reproduction system, the composite recording signal from the magnetic head unit is obtained. There is no need to provide a trap circuit to remove the pilot signal contained in the signal, and therefore, a reproduced color signal can be obtained based on this.The recording carrier color contained in the composite recording signal from the magnetic head section. This makes it possible to avoid the inconvenience that the frequency band of the signal is reduced by the trap circuit for removing the pilot signal.

C. Conventional technology When a color television signal is recorded on a magnetic tape, the conventional recording method uses a luminance signal (hereinafter referred to as an FM luminance signal) as a frequency modulated signal on the high frequency side and a luminance signal on the low frequency side. A video signal consisting of a frequency-converted carrier color signal (hereinafter referred to as a low-frequency converted color signal) is recorded on a magnetic tape by a rotating magnetic head in a state in which inclined recording tracks are sequentially formed, and an audio signal is is recorded on the magnetic tape by a fixed magnetic head, forming an audio track extending along the running direction of the magnetic tape.

In addition to this recording method, efforts have been made to record color video signals on magnetic tape at a higher density, and even though the running speed of magnetic tape is extremely low, the quality of recorded and reproduced audio signals has improved. In order to maintain good quality, an audio signal as a frequency modulated signal (hereinafter referred to as an FM audio signal) is frequency-multiplexed and synthesized with a video signal and supplied to a rotating magnetic head. A recording method has also been proposed in which the video signal is recorded on an inclined recording track together with the video signal.

Further, each of the inclined tracks on the magnetic tape is assumed to have recorded, for example, one vertical period of a video signal, that is, one field, and a corresponding audio signal.
In the reproduction system, the pilot signal used for tracking control, which is performed to make the magnetic head that extracts the video signal and audio signal from the magnetic tape, properly follow each of the inclined recording tracks on the magnetic tape, is also used for the video signal and audio signal. It has been proposed to record in addition to the signal. The pilot signal in such a case is, for example,
Consisting of four types of pilot signal components having mutually different frequencies, these are sequentially recorded on each set of four mutually adjacent inclined recording tracks, and as shown in FIG. Four adjacent recording tracks forming MiGt in the inclined recording tracks sequentially formed on the top
Tree slope recording track Tl, T2. At T3 and T4, a pilot signal component PI whose frequency is Fl, a pilot signal component P2 whose frequency is F2, respectively. frequency to F3
A pilot signal component P3 having a frequency of F4 and a pilot signal component P4 having a frequency of F4 are recorded. Frequency F1~
F4 is selected such that, for example, Fl<F2<F4<F3. Note that the fourth arrow M indicates the moving direction of the magnetic tape TPO.

Then, the FM audio signal is frequency-multiplexed and synthesized with the video signal consisting of the FM luminance signal and the low-frequency conversion color signal, and the pilot signal is further frequency-multiplexed and synthesized with the video signal and the FM audio signal, resulting in a composite recording signal, In a recording system in which recording is performed using inclined recording tracks formed in a sequential order on a magnetic tape, the signal frequency band for the composite recording signal is, for example, the characteristic diagram of FIG. 5 (vertical axis: level L, horizontal axis: frequency F). ), a relatively narrow frequency band from the upper limit of the frequency band of the low frequency conversion color signal Cc to the lower limit of the frequency band of the FM luminance signal Yf is allocated for the audio signal, and this intermediate frequency band is The FM audio signal Af is allocated, and a relatively narrow frequency band lower than the lower limit of the frequency band of the low-frequency conversion color signal Cc is allocated for the pilot signal, and the pilot signal components P1 to P4 are allocated to this low frequency band. It is assumed that the

In such a case, the FM luminance signal Yf has a carrier frequency shift band such that, for example, the tip of the synchronization signal of the original luminance signal Y has a frequency F s =4.2 MHz, and the white peak has a frequency F p =5. 4 MHz, the low frequency conversion color signal Cc has a color subcarrier frequency Fc of, for example, approximately 743 KHz, and the FM audio signal Af has a carrier frequency Fa of, for example, 1.4 MHz. 5MH
z, the frequency deviation width is approximately ±100 to 150 KHz. Furthermore, the pilot signal components P1 to P4 each have a frequency F1 to F4 of approximately 102.54±10
0 KHz, 118°95±100 KHz
, 165.21±100 KHz, 148.6
The frequency is selected to be 9±100 KHz, which is close to the lower limit of the frequency band of the low-frequency conversion color signal Cc.

As described above, the video signal consisting of the FM luminance signal Yf and the low frequency conversion color signal Cc, the FM audio signal Af, and the pilot signal components P1 to P4 are frequency multiplexed and synthesized to form a composite recording signal, which is then sequentially arrayed. A reproduction system used to obtain reproduced video signals and reproduced audio signals from a magnetic tape recorded with a large number of inclined recording tracks is configured, for example, as shown in FIG.

The reproduction system shown in FIG. 6 includes rotating magnetic heads lla and llb that sequentially and alternately scan inclined recording tracks arranged on a magnetic tape. A composite recording signal Sm is output from each of the inclined recording tracks of 1 of the video signal.
Take out the parts corresponding to the fields alternately. The composite recording signal Sm extracted from the magnetic tape by the rotating magnetic heads 11a and llb is transmitted to the reproduction amplification sections 12a and 12.
After passing through b, a switch 13 converts the signal into a series of signals.

The composite recording signal Sm obtained from the switch 13 is supplied to the pilot signal tiger knob section 14. The pilot signal trap section 14 has a filter characteristic in which the frequency band including all the pilot signal components P1 to P4 is a prohibited pass band. Pilot signal components P1 to P4 included in Sm are removed.

Then, obtained from the pilot signal trap section 14,
The composite recording signal Sm' from which the pilot signal components P1 to P4 have been removed is supplied to the audio signal trap section 15. The audio signal trap section 15 has a filter characteristic in which the frequency band including the FM audio signal Af is a prohibited band, so that the synthesized recording signal obtained from the pilot signal trap section 14 in the audio signal trap section I5. S
The FM audio signal Af included in "m" is removed.

Then, the synthesized recording signal S m '' from which the pilot signal components P1 to P4 and the FM audio signal Af are removed, which is obtained from the audio signal trap unit 15, is filtered through a high-pass filter (H
PF) 16 and a low pass filter (LPF) 17, respectively.

The FM luminance signal Yf in the composite recording signal S m '' is extracted from the HPFI 6, and it is sent to the luminance signal reproduction processing section 1.
supplied on the day. In the luminance signal reproduction processing section 18,
The FMm degree signal Yf from the HPF 16 is subjected to various processes to reproduce the luminance signal Y, and the reproduced luminance signal Y is derived to the output terminal 19. Also, from LPF17,
The low frequency converted color signal Cc from the composite recording signal Sm'' is extracted and supplied to the color signal reproduction processing section 20. In the color signal reproduction processing section 20, the low frequency converted color signal Cc from the LPF 17 is extracted. is subjected to various processes to reproduce the color signal C, and the reproduced color signal C is derived to the output terminal 21.

The composite recording signal Sm obtained from the switch 13 is also supplied to a band pass filter (BPF) 22.

The BPF 22 has a frequency band including the FM audio signal Af as a passband, and the BPF 22 extracts the FM audio signal Af from the composite recording signal Sm and supplies it to the audio signal reproduction processing section 23. be done. In the audio signal reproduction processing section 23, various processes are performed on the FM audio signal Af from the BPF 22 to reproduce the audio signal AU, and the reproduced audio signal AU is derived to the output terminal 24.

Furthermore, the composite recording signal Sm obtained from the switch 13 is also supplied to the BPF 25. The BPF 25 has a pass band that includes all the pilot signal components P1 to P4, and the BPF 25 extracts the pilot signal components P1 to P4 from the composite recording signal Sm and converts them into tracking error signals. It is supplied to the forming section 26.

In the tracking error signal forming section 26, the BPF
A tracking error signal St detects the deviation of the scanning trajectory of the rotary magnetic heads lla and 11b on the magnetic tape from the center of each inclined recording track based on the letter high lot signal components P1 to P4 included in the composite recording signal Sm obtained from 25. is formed. The tracking error signal St formed in the tracking error signal forming section 26 is then supplied to the tracking servo control section 27, where the tracking error signal St is
Tracking control is performed based on the tracking error signal St.

D Problems to be Solved by the Invention In the reproduction system as described above, the rotating magnetic head lla
HPF
16 and LPF 17, before the FM luminance signal Yf and low frequency conversion color signal Cc are extracted, switch 1
It is assumed that the composite recording signal Sm obtained from 3 is passed through the pilot signal trap section 14 and the pilot signal components P1 to P4 are removed. At this time, the pilot signal trap unit 14 has a filter characteristic that removes pilot signal components P1 to P4 having frequencies close to the lower limit of the frequency band of the low-pass conversion color signal CC. The pilot signal components P1 to P4 are removed from the composite recording signal Sm obtained from the switch 13, and the lower limit portion of the frequency band of the low-pass converted color signal Cc is also removed. Therefore,
The low frequency converted color signal Cc extracted by the LPF 17 from the composite recording signal Sm''' which has passed through the pilot signal trap section 14 and the audio signal trap section 15 has its low frequency band components reduced by the pilot signal trap section 14. As a result, depending on the reproduced color signal C obtained at the output terminal 21 and the reproduced luminance signal Y obtained at the output terminal 19, A problem arises in that the resulting reproduced image has so-called dark color blur.

In view of these points, the present invention provides a recording carrier color signal and a frequency modulated signal that occupies a frequency band higher than the frequency band of the recording carrier color signal and a recording carrier color signal having a frequency close to the frequency band of the recording carrier color signal. A composite recording signal in which the pilot signal is frequency-multiplexed and included is recorded on a magnetic tape, and the composite recording signal is extracted from the magnetic tape on which the composite recording signal is recorded, and the pilot signal is extracted from the resulting composite recording signal. In addition to obtaining the signal, a reproduced luminance signal and a reproduced color signal are obtained based on the recording luminance signal and the recording carrier color signal included in the obtained composite recording signal, and the composite recording signal is extracted from the magnetic tape. When obtaining the reciprocating luminance signal and the reproduced chrominance signal based on this, there is no need to provide a trap circuit for removing the pilot signal included in the composite recording signal, and therefore the reproduced chrominance signal can be obtained based on it. An object of the present invention is to provide a magnetic recording and reproducing device that avoids the disadvantage that the frequency band of a recording carrier color signal included in a composite recording signal is reduced by a trap circuit for removing a pilot signal. shall be.

E Means for Solving the Problems In order to achieve the above-mentioned object, the magnetic recording and reproducing apparatus according to the present invention provides a recording carrier color signal that occupies a predetermined frequency band, and a frequency band higher than the frequency band of the recording carrier color signal. A pilot having a frequency close to the frequency band of the recording luminance signal and the recording carrier chrominance signal, which is a frequency modulated signal that occupies the entire recording luminance signal, and whose phase reset processing is performed at the vertical period of the recording luminance signal. A signal is obtained, a recording carrier color signal, a recording luminance signal, and a pilot signal are frequency-multiplexed and included to form a composite recording signal, and the composite recording signal is recorded on a magnetic tape by a magnetic head unit. A recording system that records in a manner in which a plurality of recording tracks in which parts corresponding to each vertical period of a luminance signal are respectively recorded are sequentially arranged, and a composite recording signal is recorded on a magnetic tape by a magnetic head unit. The signal is extracted, and a cancellation signal is obtained which has the same frequency as the pilot signal described above and is subjected to phase reset processing with the vertical period of the recording luminance signal included in the composite recording signal from the magnetic head section. , by subtracting the cancellation signal from the composite recording signal from the magnetic head unit, the pilot signal included in the composite recording signal from the magnetic head unit is canceled, and the recording brightness included in the composite recording signal from which the pilot signal is canceled. A reproduced luminance signal is obtained based on the signal, a reproduced color signal is obtained based on the recording carrier color signal included in the composite recording signal from which the pilot signal has been canceled, and a reproduced color signal is obtained based on the recording carrier color signal included in the composite recording signal from the magnetic head section. and a reproduction system for extracting the pilot signal.

F Effect In the magnetic recording/reproducing apparatus according to the present invention having the above-described configuration, in the reproducing system, the cancellation signal is subtracted from the composite recording signal taken out from the magnetic tape by the magnetic head section. , the pilot signal included in the composite recording signal from the magnetic head section is canceled, and the reproduced luminance signal and reproduced color are generated based on the recording luminance signal and the recording carrier color signal included in the composite recording signal from which the pilot signal has been canceled. signals are obtained respectively. In order to cancel the pilot signal in the reproduction system, in the recording system, the pilot signal is subjected to phase reset processing with the vertical period of the recording luminance signal, and in the reproduction system, the cancellation signal is used as the pilot signal. This is possible because the phase reset process is performed with the vertical period of the recording luminance signal that has the same frequency and is included in the composite recording signal from the magnetic head section.

By doing so, when obtaining a reproduced luminance signal and a reproduced color signal based on the composite recording signal from the magnetic head section in the reproduction system, the pilot signal included in the composite recording signal from the magnetic head section is removed. Therefore, the frequency band of the recording carrier color signal included in the composite recording signal from the magnetic head unit, from which the reproduced color signal is obtained, is
This eliminates the inconvenience of the pilot signal being reduced by the trap circuit for removing the pilot signal.

G Example G-1 Recording System (FIGS. 1 and 2) FIG. 1 shows a recording system in an example of a magnetic recording/reproducing apparatus according to the present invention.

In FIG. 1, input terminals 31 and 32 are supplied with a luminance signal Y and a color signal C forming a video signal, respectively.

The luminance signal Y from the input terminal 31 is sent to the luminance signal recording processing section 3
3, and from the luminance signal recording processing section 33, the HPF
34, the FM luminance signal Y as a recording luminance signal
f is obtained and supplied to the adder 35. Further, the color signal C from the input terminal 32 is supplied to the color signal recording processing section 36, and from the color signal recording processing section 36, a low frequency conversion color signal Cc as a recording conveyance color signal is obtained through the BPF 37. It is supplied to the adding section 35. These FM luminance signal Yf and low-pass converted color signal Cc have frequency bands as shown in FIG. 5, and the frequency band of FM luminance signal Yf is It is assumed that the frequency band is higher than the frequency band of the low-pass converted color signal Cc.

Further, the input terminal 38 is supplied with an audio signal AU accompanying a video signal formed by the luminance signal Y and the color signal C. The audio signal AU from the input terminal 38 is sent to the audio signal recording processing section 39.
from the audio signal recording processing section 39.
0, the FM audio signal Af as a recording audio signal
is obtained and supplied to the adding section 35. This FM audio signal Af is also assumed to have a frequency band like the FM audio signal Af shown in FIG.
c and the frequency band of the FM luminance signal Yf.

Furthermore, a pilot signal supply section 41 is provided,
The pilot signal supply unit 41 includes an oscillation circuit 42 and a pilot signal forming unit 43 . A reset signal forming section 44 that resets the frequency division counter built in the pilot signal forming section 43. It is configured to include a pilot signal control section 45 that controls the pilot signal forming section 43, and an LPF 46 connected to the output end of the pilot signal forming section 43.

For example, the oscillation circuit 42 converts the horizontal frequency of the video signal into fH.
An oscillation output signal So with a constant frequency of 378 f is supplied to a pilot signal forming section 43, and in the pilot signal forming section 43, an oscillation output signal S is generated by a built-in frequency dividing counter.

is divided in four ways and has frequencies Fl, F2°F3 and F4. P3 and P4 are formed.

The reset signal forming unit 44 is supplied with the vertical synchronizing signal Vs in the video signal from the terminal 47, and the vertical synchronizing signal Vs
Forms a reset signal Sr synchronized with and supplies it to the pilot signal forming section 43.
Reset signal Sr for the frequency division counter built in 3.
Apply a reset. Thereby, the pilot signal component P1 formed in the pilot signal forming section 43
-P4 are assumed to have been subjected to phase reset processing with a vertical period (field period) in the video signal.

The pilot signal control unit 45 is supplied with a timing pulse signal Pv synchronized with the vertical synchronization signal Vs in the video signal from a terminal 48, and changes high level and low level in synchronization with the timing pulse signal Pv at a cycle twice the field cycle. The pulse signal Pa as shown in FIG. Pulse signal P as shown in Figure 2
b and supplies them to the pilot signal forming section 43, thereby controlling the order in which the pilot signal components P1 to P4 are sent out from the pilot signal forming section 43. Control of the sending order of pilot signal components P1 to P4 is as follows:
This is done according to the levels of the pulse signals Pa and Pb, and when both the pulse signal Pa and the pulse signal Pb take a high level, the pilot signal component P1 is sent out, and the pulse signal P
When a takes a low level and pulse signal Pb takes a high level, pilot signal component P2 is sent out, and when JL/S signal Pa takes a high level and pulse signal Pb takes a low level, pilot signal component P3 is sent out. The pilot signal component P4 is sent out when both the pulse signal Pa and the pulse signal Pb take a low level. Therefore, as shown in FIG. 2, four consecutive field periods Fdl, Fd2 . Pilot signal components PL, P2 . P3 and P4 are sent out, respectively, and the state is repeated.

Each of the pilot signal components P1 to P4 sent out from the pilot signal forming section 43 is supplied to the adding section 35 through the LPF 46. These pilot signal components P1 to P4 are also the pilot signal component P shown in FIG.
1 to P4, they are arranged in a frequency band lower than the frequency band of the low-pass converted color signal Cc and have frequencies close to the frequency band of the low-pass converted color signal Cc.

In the adder 35, the FM luminance signal Yf from the HPF 34, the low frequency conversion color signal Cc from the BPF 37, and the BPF 4
The FM audio signal Af from 0 and the pilot signal components P1 to P4 from the LPF 46 are frequency multiplexed and synthesized,
A composite recording signal Sm is formed. The composite recording signal Sm obtained from the adding section 35 is supplied to the rotating magnetic heads 51a and 51b through recording amplifying sections 49 and 5o, respectively.

The rotating magnetic heads 51a and 51b alternately scan the magnetic tape and output a composite recording signal Sm to the magnetic tape at its FM.
Recording is performed in such a manner that a plurality of inclined recording tracks are sequentially arranged and formed, each recording a portion corresponding to each field period of the luminance signal Yf. As a result, the inclined recording tracks arranged on the magnetic tape produce an FM luminance signal Yf, a low frequency conversion color signal Cc, and an FM audio signal Af for each string of four mutually adjacent inclined recording tracks. In addition, it is assumed that pilot signal components P1 to P4 are recorded sequentially.

G-2 Reproducing System (FIG. 3) FIG. 3 shows a reproducing system in an example of the magnetic recording and reproducing apparatus according to the present invention.

In the reproducing system shown in FIG. 3, rotating magnetic heads 51a and 51b, which are common to the recording system shown in FIG. 1, sequentially and alternately scan inclined recording tracks arranged on a magnetic tape. The rotary magnetic heads 51a and 51b provide
A portion of the composite recording signal Sm corresponding to each field period of the FM luminance signal Yf is alternately extracted from each of the inclined recording tracks on the magnetic tape. Rotating magnetic head 51
The composite recording signal Sm extracted from the magnetic tape by a and 51b is converted into a series of signals by a switch 53 after passing through reproduction amplification sections 52a and 52b.

The composite recording signal Sm obtained from the switch 53 is supplied to one input terminal of the subtraction section 54. The other input terminal of the subtraction unit 54 receives the cancellation signal P from the cancellation signal supply unit 55.
1°, P2', P3' and P4° are the composite recording signal S
Pilot signal components PI, P2 .m of the portion corresponding to each field period of the FM luminance signal Yf at m. P3
and P4. Each of the cancellation signals P1', P2', P3" and P4" is a pilot signal component P included in a portion corresponding to each field period of the FM luminance signal Yf in the composite recording signal Sm.
L, P2. The frequency 2 phase and level are substantially the same as the frequency 3 phase and level of P3 and P4, respectively. Then, in the subtracting unit 54, out of the parts corresponding to each field period of the FM luminance signal Yf in the composite recording signal Sm, the part including the pilot signal component P1, the part including the pilot signal component P2, and the part including the pilot signal component P3 are extracted. and a cancellation signal P1 from those containing the pilot signal component P4, respectively.
゛, cancellation signal P2'', cancellation signal P3', and cancellation signal P4
' is subtracted, whereby the pilot signal components P1 to P4 included in the composite recording signal Sm are canceled by the cancellation signals P1' to P4''.

Pilot signal components P1 to P4 obtained from the subtraction unit 54
The composite recording signal Smc in which the signal is canceled is supplied to the audio signal trap section 56. The audio signal trap unit 56
It has a filter characteristic in which the frequency band including the M audio signal Af is a prohibited band, so that the audio signal trap unit 56 generates a synthetic record in which the pilot signal components P1 to P4 obtained from the subtraction unit 54 are canceled. Signal Sm
The FM audio signal Af included in C is removed. and,
The pilot signal components P1 to P4 obtained from the audio signal trap unit 56 are canceled and the FM audio signal A
The composite recording signal Smc' from which f has been removed is supplied to each of the HPF 57 and LPF 58.

The FM luminance signal Yf in the composite recording signal Smc' is extracted from the HPF 57, and it is sent to the luminance signal reproduction processing section 59.
supplied to In the luminance signal reproduction processing section 59, H
The FM luminance signal Yf from the PF 57 is subjected to various processes, and the luminance signal Y is sent back, and the luminance signal Y reproduced at the output terminal 60 is derived. Furthermore, the low frequency converted color signal Cc in the composite recording signal Smc'' is extracted from the LPF 58 and supplied to the color signal reproduction processing section 61. Various processes are performed on the gamut-converted color signal Cc to reproduce the color signal C,
The reproduced color signal C is derived to the output terminal 62.

The cancellation signal supply section 55 includes a cancellation signal formation section 66 that includes a frequency division counter that divides the output of the oscillation circuit 651, and a reset signal formation section that resets the frequency division counter that is built in the cancellation signal formation section 66. section 67, and a cancellation signal control section 68 for controlling the cancellation signal forming section 66. LPF 69 connected to the output end of cancellation signal forming section 66 and LPF 6
The level adjustment section 70 is connected to the output end of the output terminal 9. The oscillation circuit 65 includes a luminance signal reproduction processing section 59
The regenerated horizontal synchronization signal Hs is supplied from the oscillation output signal S with a constant frequency of, for example, 378 fH.
o' to the cancellation signal formation section 66, and the cancellation signal formation section 6
6, the oscillation output signal So' is divided in four ways by the built-in frequency division counter, and the frequencies Fl, F
2. Cancellation signals P1°, P2', P with F3 and F4
3° and P4′ are formed.

The reset signal forming section 67 is supplied with the reproduced vertical synchronizing signal Vs from the luminance signal reproducing processing section 59, forms a reset signal Sr'' synchronized with the vertical synchronizing signal Vs, and sends it to the cancellation signal forming section 66. Supply and cancellation signal forming unit 66
Reset signal Sr' for the frequency division counter built in
Apply a reset. Thereby, each of the cancellation signals P1° to P4' formed in the cancellation signal forming section 66 is FM! in the composite recording signal Sm. It is assumed that the phase reset process is performed with the field period of the i degree signal Yf.

The cancellation signal control section 68 is supplied with a timing pulse signal Pv' synchronized with the vertical synchronization signal Vs regenerated in the luminance signal regeneration processing section 59 from a terminal 71, and changes the high level and low level in synchronization with the timing pulse signal Pv'. A pulse signal Pa'' similar to the pulse signal Pa shown in FIG. A pulse signal Pb'' similar to the pulse signal Pb shown in FIG. 2 is formed, which synchronizes and alternates high and low levels with a period twice the period of the pulse signal Pa'. Cancellation signal forming section 6
6, thereby controlling the order in which the cancellation signals P1 to P4 are sent from the cancellation signal forming section 66. The sending order of the cancellation signals P1° to P4 is controlled according to the levels of the pulse signals Pa' and Pb'.
When both the pulse signal Pa' and the pulse signal Pb' take a high level, a cancellation signal P1'' is sent out, and when the pulse signal Pa' takes a low level and the pulse signal Pb'' takes a high level, a cancellation signal P2' is sent out, When the pulse signal Pa'' takes a high level and the pulse signal Pb' takes a low level, a cancellation signal P is generated.
3' is sent out, and the pulse signal Pa'' and the pulse signal Pb'
When both are at low level, a cancellation signal P4° is sent out. Therefore, the cancellation signals P1° to P4' are respectively sent out corresponding to four successive portions of the portions corresponding to each field period of the FM luminance signal Yf in the composite recording signal Sm, and this state is repeated.

Then, the cancellation signal P sent out from the cancellation signal forming section 66
1 to P4'' are supplied to the level adjustment unit 70 through the LPF 69, and in the level adjustment unit 70, the respective levels are adjusted to the levels of the pilot signal components P1 to P4 included in the composite recording signal Sm from the switch 53, respectively. The three frequencies and the levels obtained from the level adjustment section 70 are adjusted to be substantially equal to the respective levels of the pilot signal included in the composite recording signal Sm from the switch 53. Cancellation signal P1 made substantially equal to components P1 to P40 frequency 2 phase and level
°~P4' is supplied to the subtractor 54.

Moreover, the composite recording signal Sm obtained from the switch 53 is
It is also supplied to BPF72. The BPF 72 has a frequency band including the FM audio signal Af as a pass band, and the FM audio signal Af from the composite recording signal Sm is extracted by the BPF 72 and is transmitted to the audio signal reproduction processing section 7.
3. In the audio signal reproduction processing section 73,
The FM audio signal Af from the BPF 72 is subjected to various processes to reproduce the audio signal AU, and the reproduced audio signal AU is derived to the output terminal 74.

Further, the composite recording signal Sm obtained from the switch 53 is also supplied to the BPF 75. The BPF 75 has a pass band that includes all the pilot signal components P1 to P4, and the BPF 75 extracts the pilot signal components P1 to P4 from the composite recording signal Sm and converts them into tracking error signals. It is supplied to the forming section 76.

In the tracking error signal forming section 76, the BPF
Based on the pilot signal components P1 to P4 included in the composite recording signal Sm obtained from 75, the deviation of the scanning locus of the rotating magnetic discs 51a and 51b on the magnetic tape with respect to the center of each inclined recording track is tracked. An error signal St is formed. Then, the tracking error signal St formed by the tracking error signal forming section 76 is supplied to the tracking servo control section 77, and the tracking error signal St formed by the tracking error signal forming section 76 is
Tracking control is performed based on the tracking error signal SL.

(, -3 Modification) The level adjustment unit 70 constituting the cancellation signal supply unit 55 in the above-described reproduction system detects the levels of each of the pilot signal components P1 to P4 included in the composite recording signal Sm obtained from the switch 53. According to the level detection output signal obtained thereby, the respective levels of the cancellation signals P1° to P4' are automatically adjusted to match the respective levels of the detected pilot signal components P1 to P4. Good too.

Effects of the Invention H As is clear from the above explanation, the magnetic recording and reproducing apparatus according to the present invention can produce a recording carrier color signal, a recording luminance signal which is a frequency modulated signal occupying a frequency band higher than the frequency band of the recording carrier color signal, and A composite recording signal containing a pilot signal having a frequency close to the frequency band of the recording carrier color signal is frequency-multiplexed and is included, and the composite recording signal is recorded on the magnetic tape, and the composite recording signal is recorded on the magnetic tape. A composite recording signal is extracted, a pilot signal is obtained from the resulting composite recording signal, and a reproduced luminance signal and a reproduced color signal are generated based on the recording luminance signal and the recording carrier color signal included in the obtained composite recording signal. In order to obtain the pilot signal, in the reproducing system, a cancellation signal is subtracted from the composite recording signal extracted from the magnetic tape by the magnetic head unit, thereby canceling the pilot signal included in the composite recording signal from the magnetic head unit. Since the reproduced luminance signal and the reproduced color signal are obtained respectively based on the recording luminance signal and the recording carrier color signal included in the composite recording signal whose signals are canceled, the composite recording from the magnetic head unit in the reproduction system is performed. When obtaining the reproduced luminance signal and the reproduced color signal based on the signals, it is no longer necessary to provide a trap circuit to remove the pilot signal included in the composite recording signal from the magnetic head section. The frequency band of the recording carrier color signal included in the composite recording signal from the magnetic head unit is the target for pilot signal removal.

This makes it possible to avoid the inconvenience that the power consumption is reduced by the pull-up circuit.

As a result, a high-quality reproduced image without so-called "color bleeding" can be obtained based on the reproduced luminance signal and reproduced color signal obtained in the reproduction system.

[Brief explanation of the drawing]

FIG. 1 is a block connection diagram showing a recording system in an example of a magnetic recording/reproducing device according to the present invention, the second leap is a waveform diagram for explaining the recording system shown in FIG. 1, and FIG. 3 is a diagram according to the present invention. FIG. 4 is a conceptual diagram illustrating the manner in which pilot signals are recorded on a magnetic tape, and FIG. 5 is an explanation of recording signals on a magnetic tape. FIG. 6 is a block connection diagram showing a reproduction system in a conventional time recording and reproduction apparatus. In the figure, 33 is a luminance signal recording processing section, 35 is an addition section, and 36
39 is a color signal recording processing section; 41 is an audio signal recording processing section;
4 is a pilot signal supply unit, 42 and 65 are oscillation circuits, and 4
3 is a pilot signal forming section, 44 and 67 are reset signal forming sections, 45 is a pilot signal control section, 51a and 5
1b is a rotating magnetic head, 54 is a subtraction unit, 55 is a cancellation signal supply unit, 59 is a luminance signal reproduction processing unit, 61 is a color signal reproduction processing unit, 66 is a cancellation signal forming unit, 68 is a cancellation signal control unit, and 70 is a cancellation signal control unit. level adjustment section; 73 is an audio signal reproduction processing section; 7
5 is a BPF, and 76 is a tracking error signal forming section. Figure 4: Recording pattern of pilot signal Figure 5: Frequency spectrum of recorded signal

Claims (1)

[Scope of Claims] A color signal recording processing unit that obtains a recording carrier color signal occupying a predetermined frequency band, a recording luminance signal that is a frequency modulated signal occupying a frequency band higher than the frequency band of the recording carrier color signal. a pilot signal that obtains a pilot signal having a frequency close to the frequency band of the recording carrier color signal and in which a phase reset process is performed with a vertical period in the recording luminance signal; a signal synthesizing section that forms a composite recording signal in which the carrier color signal for recording, the luminance signal for recording, and the pilot signal are frequency-multiplexed and included; a recording system including a magnetic head unit for recording on a tape in a manner in which a plurality of recording tracks in which portions corresponding to each vertical period of the recording luminance signal in the composite recording signal are respectively recorded are formed in an array; A magnetic head unit extracts the composite recording signal from the magnetic tape on which the recording signal is recorded, and has the same frequency as the pilot signal, and has a phase with a vertical period in the recording luminance signal included in the composite recording signal from the magnetic head unit. a canceling signal forming unit that obtains a canceling signal for which reset processing is to be performed; subtracting the canceling signal from the composite recording signal from the magnetic head unit and including the result in the composite recording signal from the magnetic head unit; a pilot signal canceling section that cancels the pilot signal obtained from the pilot signal canceling section; a luminance signal reproduction processing section that obtains a reproduced luminance signal based on a recording luminance signal included in the signal obtained from the pilot signal canceling section; A reproduction device including a color signal reproduction processing unit that obtains a reproduced color signal based on a recording carrier color signal included in the signal, and a pilot signal reproduction unit that extracts a pilot signal included in the composite recording signal from the magnetic head unit. A magnetic recording/reproducing device comprising: a system;