JPS5919206A - Magnetic recorder - Google Patents

Abstract

PURPOSE:To ensure an excellent S/N and a wide dynamic range of the sound signal, by supplying the FM modulated sound signal to a rotary magnetic head with no mixture with a video signal and recording the sound signal at a high recording level. CONSTITUTION:Left and right signals SL and SR are modulated by FM modulators 6 and 7 as well as 11 and 12 and turned into FM modulated left and right signals of different frequency deviation bands. The signals LF1 and RF3 supplied from BPFs 13 and 15 are mixed together by a mixing circuit 17. The signals LF2 and RF4 are also mixed in the same way. Each mixture output and video signal are supplied to mixing circuits 21 and 22 and then recorded. In this case, the gains of variable gain amplifying circuits 18 and 20 are controlled with a control signal P, and the level of each mixture output is considerably reduced compared with the video signal. Thus the interferece is reduced to the video signal. When the recording is carried out with no mixture with the video signal, only the mixture output is supplied to the circuits 21 and 22 by a control signal Q. Then the gains of the circuits 18 and 20 are controlled, and the mixture output is supplied to the head with a sufficiently high level compared with the recording with mixture of the video signal. Thus, both S/N and dynamic range are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an audio signal that is made into a signal that avoids frequency modulation that occupies a frequency band different from the frequency band of a video signal.
The present invention relates to a magnetic recording device capable of recording with a rotating magnetic head that forms all oblique recording tracks on a magnetic recording medium without mixing with a video signal. , Background Art and Problems When a color television signal is recorded on a magnetic tape, the carrier color signal and luminance signal that form the entire color video signal are separated, and the carrier color signal is frequency-converted to the lower frequency band side. The luminance signal is frequency modulated (hereinafter referred to as FM modulation) in the high frequency band side, and then both are mixed to create a recording track (hereinafter referred to as tilted track) arranged at an angle with respect to the running direction of the magnetic tape. ) with the distribution,
A recording track (hereinafter referred to as an audio track) in which the single audio word that was cut extends in the direction along the running direction of the magnetic tape.
In this recording format, a color video signal, that is, a low-frequency converted color sending signal and a high-frequency FM-modulated luminance signal are the mainstream. The oblique trunk that can be recorded is formed by two rotating magnetic heads supplied with these signals alternately scanning the magnetic tape at an angle with respect to the direction of travel of the magnetic tape. In order to increase the recording density and enable long-term recording, gaps are created between adjacent inclined tracks.
It has been proposed not to place a so-called guard band, but to make the ranks adjacent to each other.

In this case, crosstalk between adjacent inclined tracks becomes a problem during playback, but by making the azimuth angles of the two co-rotating magnetic heads different from each other, FM modulation is performed on the high frequency side during playback. The azimuth loss of the luminance signal due to crosstalk from adjacent tracks is minimized, and for the carrier chrominance signal that has undergone low frequency conversion and has a small azimuth loss effect, for example, its phase is changed to
Every seventh tilted track is recorded continuously, and the remaining tilted tracks are recorded in reverse every horizontal period, and a predetermined phase restoration is performed on the reproduced conveyed color signal. The problem of crosstalk is solved by eliminating crosstalk from adjacent tracks by passing it through a comb-shaped characteristic filter.1. When the fixed head supplied with the signal comes into contact with the running magnetic tape, for example, the audio signal is continuously formed on the upper end side of the magnetic tape. In the case where there are two kinds of audio signals, the left and right signals are supplied to separate fixed heads, and these two fixed heads form two parallel audio tracks.

By the way, the high density [W
The recording was started from 1-1 on the cheeks, (the magnetic tape and the rotation? Extremely low speed, (θ reeling, / , , 3J, · m /sec culm degree 9, therefore, i'i'i' · track ■ 1f-
Fixation to be achieved - 't11g between RAD and magnetic tape
” Preparation became extremely slow, and the record-type RL Oton was south 1.
1M of the word name is lowered by 1 generation and there is an adverse effect of 1V).
The color video signal is mixed with the rotating fH air head (IJ), which originally records the color video signal.
tr:il+-ra・'ri1]2(to record this signal to the color image(this). Due to the low phase speed of A magnetic recording and reproducing device has been proposed that reproduces
, 1υ1 According to this device, the relative speed between the recording and the magnetic tape is low (it is possible to prevent the deterioration of the quality of the recorded sound signal, and also to reduce the slowness of the recorded sound on the magnetic tape). Even when variable speed playback such as playback or speed replay is performed, the relative speed between the rotating magnetic head and the magnetic tape is (-1), and the relative speed between the rotating magnetic head and the magnetic tape is the same as during recording ( Since this does not change significantly compared to normal playback in which playback is performed with σt, there is a large difference (○
However, recording by such a device has the advantage of being able to record the endogenous voice that takes place overnight. The FM-modulated audio frequency band occupied by No. 1 is different from the frequency band of the color image signal, but the frequency band of the entire recording No. 1 is limited. Therefore, it is considered to be relatively close to the frequency range of the color video symbol. Therefore, the reproduced audio (
In order to achieve a good signal-to-noise ratio (hereinafter referred to as the S/N ratio) of the speech output and widen the dynamic range, the color video during playback is adjusted to the recording level of the FM-modulated audio signal. The interference with one word becomes significant, and the reproduced color video signal (low screen) is affected by beat disturbances, etc., which deteriorates the image quality. In order to reduce the interference, it was necessary to reduce the total recording level of the F'M modulated audio signal. However, the total recording level of the FM modulated audio signal is This will lower the S/N ratio of the signal output and cause a reduction in the dynamic range, making it impossible to obtain high-quality reproduced audio.

Purpose of the Invention As described above, the present invention mixes an FM-modulated audio signal with a video signal, supplies it to a rotating magnetic head 2, and records the mixture together with one video word on an inclined track formed on a magnetic recording medium. In this way, when recording audio signals using a magnetic recording device, the quality of the recorded audio signal is prevented from deteriorating due to the low relative speed between the recording head and the magnetic recording medium. In view of the fact that the recording level of the recorded audio f signal has to be reduced from the perspective of interference with the video signal, a single FM modulated audio word is supplied by a rotating magnetic headdress without being mixed with the video signal, and the recording level is sufficiently high. By recording on the inclined tracks formed on the magnetic recording medium as having a large recording level, the audio signal (with respect to It is an object of the present invention to provide a magnetic recording device capable of recording in such a manner that high-quality reproduced audio signal output can be obtained.

Summary of the Invention The magnetic recording device according to the present invention converts one audio word into an FM-modulated signal that occupies a frequency band different from the frequency band of the video @ layer code, and magnetically records it without mixing it with the video signal. It is designed to enable recording by being supplied to a rotating magnetic head that sequentially forms a plurality of recording tracks on a recording medium, and the FM-modulated audio signal is supplied to the rotating magnetic head without being mixed with a video signal. level, e.g. FM
When the gain of an amplifier placed between a modulator that generates a modulated audio signal and a rotating magnetic head is controlled, and this FM-modulated audio signal is mixed with a video signal and supplied to the rotating magnetic head. It is made to be sufficiently large compared to . -! In addition, preferred example 7 of the magnetic recording device according to the present invention
In this case, together with the FM-modulated audio signal at a sufficiently high level, a signal corresponding to the unmodulated carrier component of the FM-modulated luminance signal 6 in the video signal is
It is supplied to the rotating magnetic head as a recording bias signal for the FM modulated audio signal.

EXAMPLE Hereinafter, an example IC of the present invention will be described with reference to all the drawings.

FIG. 7 shows a main part of an example of a magnetic recording device according to the present invention. In this example, Ω-channel audio signals of stereo left and right signals are supplied as audio signals to be recorded, and these Ω-channel audio signals are magnetically converted into FM-modulated audio signals from Kintetsu 1 to Rinori. It is intended to be recorded on tape, and it is also possible to record these FM modulated audio signals together with color video signals.

In this example, a left signal SL and a right signal SR of stereo audio signals are supplied to the audio input terminals / and S, respectively.

This left one word SL passes through an automatic gain control amplifier circuit 3, a noise reduction circuit, and a pre-emphasis circuit 5 in order.
The signal is supplied to the first and Ω-th FM modulators B and 7, respectively. 'Furthermore, the right signal SR is similarly connected to the automatic gain control amplifier circuit g, the noise reduction circuit 9, and the pre-emphasis circuit 10.
3rd and 3rd FM modulator // and /
1) The first and second FM modulators B and 7 are supplied with a frequency f/ and a frequency fΩ higher than f/, e.g. f/=/-32 MHz, f,2=/ , 1175
MHz, carrier waves are FM-modulated with the left signal SL with the same frequency shift width, for example, about 700~/&0kHz, and the FM-modulated left signals with different frequency shift bands are sent to each output end. (hereinafter referred to as the left FM signal)
LF/and LF,2 are obtained. Also, the third and third FM modulators // and /2 (d, f, higher frequency f than 2)
3 and a frequency f9 even higher than fs, e.g. fs-
Ha Otsu 2! ; FM modulation of the carrier wave of fq=/, '775M, Hz in MHz with the same frequency shift band as above with the right signal SR, and a frequency shift band fitting at each output end. Right signal (hereinafter referred to as right FM IN) RF3 and IIF? is obtained1, where,
Frequency f,, fyu.

f7 and f& are selected such that the interval between adjacent Ω is such that the beat noise component between the left FM signal and the right FM signal after demodulation is outside the reproduced audio signal band,
In the above example, this interval is 730 kHz.1, λ left FM signals LF/and LF obtained in this way, 2 and Ω right FM signals RF3 and RFq(l-j
:, respectively, the corresponding bandpass filter /3°/4, 1
Pass all 5 and /6. These left FM signals LF/ and LF2 and right FM signals RF3 and 1% Fq have frequency spectra as shown in Figure 2 (the horizontal axis is frequency f), and each has a frequency shift band. Although they are located in different IC Ls at regular intervals, adjacent frequency shift bands are extremely close to each other, and the overall frequency band is relatively narrow.

The left FMI word LFt and the right FM signal RFJ from the bandpass filters /, J' and /S are mixed in a mixer circuit /7 and supplied to a variable gain amplifier circuit /g. Further, the left FM signals LF, 2 and the right FM signal RFg from the bandpass filters /11 and /B are mixed by a mixing circuit /9 and supplied to the variable gain amplifier circuit 20.

Then, the left FM signal LF/ from the variable gain amplifier circuit/g
The mixed output of the right FM signal RF, 7 is supplied to the mixing circuit 2/, and the left FM signal LF, 7 from the variable gain amplifier circuit 20 is supplied to the mixing circuit 2/.
The mixed output of 2 and the right FM signal RF signal is the mixed circuit 22VC.
Supplied.

On the other hand, the color video signal V is supplied to the video input terminal 23. , this color video signal V is supplied to a band pass filter 2, and a carrier color signal C is separated and obtained at its output end. This carrier color signal C is transmitted to the automatic level control circuit 23.
The output from the frequency conversion circuit 27 is taken out via a low-pass filter 27. As a result, from the low-pass filter 27,
The carrier color signal C has a color subcarrier frequency fc lower than the aforementioned frequency f/, e.g.
(Z) A low-frequency converted carrier color signal C' is obtained.The low-frequency converted carrier color signal C' is obtained when the killer switch section 2g is turned on. The output of the automatic level control circuit 2S is also supplied to the color killer circuit 30, and the output of the automatic level control circuit 2S is also supplied to the color killer circuit 30.
0, when the carrier color signal C is supplied from the automatic level control circuit 2Shio, the killer switch section λg passes all of the output of the low pass filter 27, and the automatic level control circuit 2S
When the carrier color 1 word C is not supplied from the low-pass filter 27, the output of the low-pass filter 27 is controlled not to be passed.

'1. In addition, the color video signal V from the video input terminal 23 is also supplied to the low-pass filter 3/, and a luminance signal L111 is separated and obtained at its output terminal. This luminance signal Lm
il-1: FM modulator 3 via automatic gain control circuit 32, pre-emphasis circuit 33 and clamp circuit 3.
Supplied to S. In this FM modulator 3, the luminance signal L
The leading edge of the synchronization signal of m has a frequency f8 sufficiently higher than the above-mentioned frequency ffi, for example, fs-tIMH2, and its white peak (maximum amplitude part) has a frequency higher than fs by a predetermined frequency, for example, 7.2MH2. f For example, f,=1 5, . FM modulation is performed so that 2MH2,
An FM-modulated luminance signal LM is obtained from its output end. The FM-modulated luminance signal LM is then supplied to the mixing circuits 2/ and 2.2 via the high-pass filter 3B and the switch 37 when turned on.

In this way, the left and right FM signals LF/+ LF, 2+
The outputs of the mixing circuits 2/22 to which the RFJ and RF+, the low frequency conversion carrier color signal C' and the FM modulated luminance signal LM can be supplied are sent to the rotating magnetic heads ITO and 22 via recording amplifier circuits 3g and 39, respectively. 11t/. These rotating magnetic heads l10 and g/ have different azimuth angles from each other, and alternately form inclined tracks having no guard bands on the magnetic tape 2/, and combine the output of the mixing circuit 2/2 with the output of the mixing circuit 22. 1°'' - the frequency f of the chrominance subcarrier of the low-pass transformed carrier chrominance signal C', as described above. is lower than the frequency f/, and the lower limit frequency f in the frequency deviation of the FM-modulated luminance signal LM
8 is made sufficiently higher than the frequency f4I, and the left FM fg
The signals LFl and LF, 2 and the right FMf signals RF, 7 and RFu extend to the upper limit side of the frequency band of the low-pass converted carrier color signal C' and to the lower side of the FM modulated luminance signal LM. and the left FM signals LFz and LF2, and therefore occupy a frequency band different from the frequency band of the video signal. Right FMI
Yoshigo RF,? and RFq are the video signals, i.e., in this case, the low-pass converted carrier color signal C' and the FM modulated luminance V
When recorded together with the signal LM, the switches 29 and 37 are both turned on by the control 1 word P from the control input terminal λ.

As a result, in the mixing circuit 2/, the left FM signal LF/ and the right F
Mf word RF,? The mixed output is the low frequency conversion carrier color signal C
' and FM modulated luminance signal LM, the mixed output is supplied to the rotating magnetic helladog θ via the recording amplifier circuit 3g, and the left FM signal L is
The mixed output of F. It is supplied and recorded on the magnetic tape. At this time, the control signal P from the control input terminal 4t2 is also supplied to the open side 1 end of the variable gain amplifier circuit /g and 20,
This control 1 word P controls the gains of the variable gain amplification circuit 1/g and -0, and mixes the left FM signal LF/ and the right FM signal RF3 supplied to the mixing circuits 2/ and 22. The output and the level of the mixed output of the left FM signals LF, 2 and the right FM signal RFz are made to be considerably smaller than the levels of the low frequency conversion carrier color signal C' and the FM modulated luminance signal LM. and the left FM signal LF/ during playback.
and LF, and the low frequency conversion carrier color signal C' of the right FM signals RF, y and RFq, and the FM modulated luminance m'' signal L
9. In this case, the left FM signal LF/and LF, and the right F are made to have as little interference as possible to M.
M@ No. RFJ and RFq and low frequency conversion carrier color signals C' and F
The frequency spectrum and level relationship between the M-modulated luminance signal LM and the M-modulated luminance signal LM are shown, for example, in FIG.
f and the vertical axis is level t). Here, the level of the low-pass conversion carrier color signal C' is lower than the level of the FM-modulated luminance signal LM by about /θdB, and the left FM signal LF/- and LF, 2* and the right FM signal The levels of RFJ and RFu are FM modulated and L is about dB lower than the level of the luminance signal LM, and
The level of the low-frequency conversion carrier color signal C' is lowered by about I)/3 dB, and the left FM signals LF/, LF, 2, and right F
M signals RF", ? and RFq are low-frequency conversion carrier color signals C
' and Kσ so as not to compress the frequency band of the FM-modulated luminance signal LM as much as possible. In addition, the left FM signal LF
/ and LF”, and right F'M signal RFJ and RF
A relatively small level difference may be provided between each of q as necessary.

On the other hand, the left FM signals LF/ and LF, and the right FM signals RF3 and RF, The state of recording without mixing is achieved by supplying the control signal Q to the control input terminal 412. When the control signal Q is supplied to the control input terminals 11 and 2,
This control signal Q turns off the switches 29 and 37. As a result, the low frequency conversion carrier color signal C' and the FM modulated luminance signal LM are not supplied to the mixing circuits 2/ and 2.2, and the left FM signal LF from the variable gain amplifier circuit /g and 20 is not supplied. Only the mixed output of / and the right FM signal RFJ and the mixed output of the left FM signal LF2 and the right FM signal RF will be supplied, respectively. / are supplied respectively. At this time, the control signal Q is also supplied to the control terminals of the variable gain amplifier circuit /g and 20, and the gains of the variable gain amplifier circuit /g and 20 are controlled by this control signal Q. Mixed output of FM signal LFt and right FM @ No. RF3, left FM signal LI"- and right FM IN No. R
1, for example, when the level of the mixed output with Fz is sufficiently large compared to the case where this L and others are mixed with video No. 18 and supplied to the rotating magnetic heads qO and 9/. Figure 3 C: Here, the level is set to OdB.1
Therefore, in this case, the left 1" M signal L F / and the right FM signal R are assumed to have sufficiently large levels, respectively.
Mixed output with F3 and left FM signal LF, 2 and right FMI
Only the mixed output with No. h RFQ is output from mixing circuit 2/and 2.
2, and the rotary magnetic head/! via the recording amplification circuit 1 3g and 39. 0 and 4/i are supplied respectively on the magnetic tape (recorded at the intersection q). It is possible to obtain an extremely high-quality reproduced audio signal with an excellent ratio and a sufficiently wide dynamino/clean range.4 FIG. 9 shows the main part of another example of the magnetic recording device according to the present invention. The example shown in Fig. 9 is shown in Fig. 3 ('The parts corresponding to each part in the exhaustive example are shown with the same numbers as in Fig. 3, and their detailed explanation is omitted. too,
In this example Ct, the switch 3 is provided between the video input terminal λ3 and the input terminals of the bandpass filter 2g and the low pass filter 3/, and the output terminal of the killer switch section 2g is Mixing circuit 2/ without using a switch
and 2.2, connected to each of the seven input terminals, and further,
The output terminal of the high-pass filter 3B is connected to each of the seven input terminals of the mixing circuit 2/22 via a level adjustment circuit tag. The control input terminal is connected not only to the control terminals of the variable gain amplifier circuits /g and 20, but also to the control terminal of the switch II3.

In such an example, the left signal SL and right signal SR of the stereo audio signal are supplied to the audio input terminal / and λ, respectively, and the color video signal V is supplied to the video input terminal 23, so that the above-mentioned results are obtained. Left FM signal LF/and LF obtained in the same way
, 2, and the right FMI words RFJ and RFq are recorded together with the video signal, i.e., the low-pass converted carrier color signal C' obtained in the same manner as described above, and the FM modulated luminance signal LM, Control from iJI input terminal '72■
1 signal P' turns on the switch lI3,
Further, the variable gain amplifier circuit /g and the gain of 20 are the third
In the example shown in the figure, the variable gain amplifier circuit /g and the control terminal 4 are controlled in the same way as when the control signal P is supplied to the control terminal 20.
, Furthermore, at this time, the level adjustment circuit tag is supposed to give an appropriate level to the FM-modulated luminance signal LM.1 In the example of FIG.
This is equivalent to the state in which one control word P is supplied to 1.2,
In the same way as in the example of FIG. 3 above, the left F M I;
g LF/ and right FM signal RF,? Mixed output with and left F
The mixed outputs of the M signal LF2 and the right FM signal RFq, the low frequency conversion carrier color signal C' and the FM modulated luminance signal, and the mixed outputs of the M signal are outputted to the rotating magnetic hesodogs 0 and ll/.
The left FM signals LFl and t, F, 2, and the right FM signal 11 are supplied to the magnetic tape and recorded on the magnetic tape.
i'M Yugo RF'? and RFg as a video signal, i.e.
Low-pass conversion carrier color signal C' and FM modulated luminance signal L
The state in which recording is performed without mixing with The signal Q' turns off the Q2 notch 73. As a result, the carrier color signal C cannot be obtained from the band west filter and the 2G, and the automatic level control mqjIE
The color signal C carried from the J path 25 is sent to the color killer circuit 30K.
Since the color killer circuit 30 is not supplied with X, the color killer circuit 30 is controlled so as not to pass all of the outputs of the killer switch section, 2g"f, and the low-pass filter 27. Therefore, the output terminal of the low-pass filter 27 is connected to the mixing circuit, 1, and with this the signals to 2/ and 22 will be interrupted.
Since the luminance signal Lm is no longer obtained from the low-pass filter 3/, and the luminance signal LIn is not supplied to the left of the FM modulator 3, the center frequency signal, that is, the FM modulated luminance, is output from the left of the FM modulator 3. A signal corresponding to an unmodulated carrier wave component in a single word LM. is obtained. This signal. is supplied to the mixing circuits 2/ and 22 through the high-pass filter 3 and the level adjustment 11'tlf, and outputs a mixture of the left I''M signal LF/ and the right 1?M signal RFJ and the left FM.
The mixed output of the signal LF, 2 and the right FM signal RF q is supplied to the rotating magnetic heads K0 and G/1, in this case the signal R. are the left FM signal LF/ and the right FM signal R
In this case, the control signal is set as a recording bias signal having a sufficiently high frequency for the mixed output with F3 and the mixed output of the left FM signal LF, 2 and the right FM signal RF, t. Q' is also supplied to the control end of the variable gain amplifier circuit /g and 20, and this control signal Q' controls the gain of the variable gain amplifier (bj path 7g and) θ.
The mixed output of the left FM signal LF/ and the right F''M signal RF, ? and the combined output of the left FM@signal LF2 and the right FM signal RFa are mixed with the image signal and rotated. The output voltage is sufficiently large compared to the case where the voltage is supplied to the magnetic heads q0 and 4/.Furthermore, in the level adjustment circuit llq,
Signal. The level of is adjusted so that it becomes the optimum recording bias signal for both mixed outputs, which have been set to a sufficiently high level in this way. Therefore, in this case, the left I"M, which is assumed to have a sufficiently large level,
Mixed output of signal LF/ and right FM signal RFJ and left FM
The mixed output of the signal LF'- and the right FM signal RF<z is a signal at an appropriate level as a recording bias signal. Together with the mixing circuit 2/and 22, the recording amplifier circuit 3g
and 39 to the rotating magnetic heads θ and G/, respectively, and a mixed output signal of both of them is output on the magnetic tape. Bias recording is performed alternately.

In this case as well, during reproduction, it is possible to obtain extremely high-quality reproduced audio [signal output] with an excellent S/N ratio and a sufficiently wide dynamic range.

In the above-mentioned embodiment, one voice of the Ω channel of the left signal SL and the right one word SR is obtained by FM modulation of the carrier waves selected at a predetermined frequency interval. The FM-modulated audio signals LFy + LF of adjacent RIs are sequentially arranged with different frequency shift bands KL and LFy + LF.
. At this time, the [d wave number shift bands of the FM-modulated audio signals recorded on the same inclined track are made not to be adjacent to each other, and the FM-modulated audio signals recorded on one adjacent inclined track are The carrier frequencies of the audio signals are made not to match, but as a result, the audio signal of the Ω channel can be recorded as an FM modulated signal by using only a relatively narrow frequency e and several bands. During playback, it is possible to obtain playback signals of the Ω channels that are sufficiently separated from each other, with interference caused by crosstalk components from adjacent tracks being extremely reduced.

APPLICATION EXAMPLE The magnetic recording device according to the present invention, unlike the above-mentioned example of λ, can record audio signals of /channel using seven or more FM
It can also be treated as a modulated audio signal,
For example, it can also function as a video and audio signal recording device that records one audio signal as seven FM-modulated audio signals together with a video signal.

! f. Also, the magnetic recording device according to the present invention has the function of mixing an FM modulated audio signal with the entire video signal and recording it on a magnetic recording medium as in the above-mentioned λ examples, and mixing the video signal with the video signal. It is possible to configure a single-word audio recording device that completely removes the function of recording an FM-modulated audio signal mixed with a video signal from a device that can selectively perform recording on a magnetic recording medium without any interference.

Effects of the Invention As is clear from the above description, the magnetic recording apparatus V according to the present invention can record audio signals on an all-magnetic recording medium at a sufficiently high relative speed between it and the recording head. Therefore, the quality of one recorded speech word does not deteriorate, and the level of the recorded speech signal can be set to a sufficiently high level suitable for its reproduction. It is possible to record an audio signal in which an extremely high-quality reproduced audio signal output having an excellent /N ratio and an expanded dynamic range can be obtained.

Furthermore, 812 recording, in which all inclined tracks are formed by a rotating magnetic head, has the advantage of extremely little wow and flutter during recording. Also, since the utilization rate of the magnetic recording medium is increased, the recording medium cost is reduced. 3.

[Brief explanation of the drawing]

FIG. 1 is a block connection diagram showing the main parts of an example of a magnetic recording device according to the present invention, and FIGS. 2 and 3 are frequency spectrum diagrams shown in FIG. Fig. 9 1 is a block connection diagram showing the main parts of another example of the magnetic recording device according to the present invention. In the figure, / and 1 are audio input terminals, A, ?, /
/. /2 and 3S are FM modulators, 7g and 20 are variable gain amplifier circuits, /7. /9. ．． 2/ and 22 are mixed circuits, U3
is the video input terminal, 2 is the frequency conversion circuit, 30il-1
: Color killer circuit 1.29.37 and evening, J+ is a switch, 41Ω is an open leg input terminal, Gθ and G/ are rotating magnetic heads1,

Claims (1)

[Claims] (1) Frequency modulate a carrier wave of a predetermined frequency with an audio signal to obtain a frequency modulated audio signal that occupies a frequency band different from the frequency band of the video signal, and use the frequency modulated audio signal as the video signal. The frequency-modulated audio signal is mixed with the video signal by being supplied to a rotating magnetic head configured to sequentially form a plurality of recording tracks on a magnetic recording medium for recording without mixing. When supplying the signal to the rotating magnetic head, the level of the frequency-modulated audio signal is lower than that when the frequency-modulated audio signal is mixed with the video signal and supplied to the rotating magnetic head. A magnetic recording device made of the following. (,2) The video signal includes at least a frequency-modulated luminance signal component, and the frequency-modulated audio signal is supplied to the rotating magnetic head without being mixed with the video signal, and the frequency-modulated audio signal is supplied to the rotating magnetic head without being mixed with the video signal. Claim 1, wherein the signal sound corresponding to the unmodulated carrier wave component in the frequency-modulated luminance signal is supplied to the rotating magnetic head as a recording bias signal for the frequency-modulated audio signal. magnetic recording device.