JPH06203302A - Magnetic recording device, magnetic reproducing device, magnetic recording and reproducing device and magnetic recording medium for video/audio - Google Patents

Abstract

PURPOSE:To eliminate a cross modulation distortion between reproduced audio signals and to obtain a video without crosstalk by recording a modulated audio signal in the depth layer part of the 1st recording area, recording a modulated video signal in its surface layer part and recording only the modulated audio signal in the 2nd recording area. CONSTITUTION:The same frequency allocation is generated by the 1st and 2nd recording processing means and a recording FM video signal is used for a 8MHz single chip level and a 10MHz white level and has an occupied band 2MHz to 16MHz. The azimuth angles of a magnetic head for recording an FM-modulated audio signal and a magnetic head for recording a PCM-coded audio signal are made at almost equal for example, 30 deg., and the azimuth angle of the head for recording the FM-modulated signal is made at +15 deg. and -15 deg., for example, thereby the crosstalk between tracks can be evaded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video / audio signal magnetic recording device, a video / audio signal magnetic recording medium, and a video / audio signal magnetic recording / reproducing device.

[0002]

2. Description of the Related Art Conventionally, as a high-density magnetic recording / reproducing method, a segment system in which one screen is divided and recorded / reproduced on a plurality of tracks is known. As a VTR for recording a high-definition signal, a "consumer high-definition VTR" is used. Television Society Technical Report VOL.15NO.50 is proposed. It is disclosed that this VTR records a video signal and a PCM-converted audio signal in separate areas on a magnetic tape.

[0003]

However, the PCM
In some cases, it may be desired to record an FM-modulated audio signal separately from the converted audio signal.
If the M-modulated audio signal is frequency-multiplexed and recorded in an area different from the video signal, there is a problem that the quality of the audio signal deteriorates due to the intermodulation distortion of both signals. On the other hand, bias recording can be considered as a means for suppressing this cross modulation distortion, but in the bias recording method, there is a problem that the bias signal cross-talks with the video signal and deteriorates the quality of the video signal, and thus it can be adopted. There wasn't.

Therefore, an object of the present invention is to solve the above problems and record and reproduce the PCM-converted audio signal and the FM-modulated audio signal without deteriorating the quality of the video signal and the audio signal.

[0005]

The present invention provides the following configurations in order to solve the above problems.

In a video / audio signal magnetic recording apparatus for simultaneously recording an input video signal and an input audio signal on a magnetic recording medium, a first recording audio signal obtained by at least modulating the input audio signal is first recorded. First audio signal recording means for performing prior recording using the first magnetic head in a deep portion of the area, and a recording video signal obtained by at least modulating the input video signal, and an azimuth angle different from that of the first magnetic head. A second recording audio signal obtained by at least modulating the input audio signal, and a video signal recording means for performing subsequent recording on the surface layer portion of the first recording area using a second magnetic head having A video / audio signal magnetic recording device comprising: second audio signal recording means for recording in the second recording area by using a third magnetic head.

A first reproducing audio signal is reproduced by outputting at least a signal reproduced from the deep portion of the first recording area of the magnetic recording medium by using the first magnetic head.
Audio signal reproducing means, and a video signal reproducing means for at least demodulating a signal reproduced from the surface layer portion of the first recording area of the magnetic recording medium using the second magnetic head to reproduce and output an output video signal. And a second audio signal reproducing means for at least demodulating a signal reproduced from the second recording area of the magnetic recording medium by using the third magnetic head and reproducing and outputting a second output audio signal. A video / audio signal magnetic reproducing device characterized by the above.

A video / audio signal magnetic recording / reproducing apparatus for simultaneously recording an input video signal and an input audio signal on a magnetic recording medium and reproducing the output video signal and the output audio signal from the recording medium at the same time First audio signal recording means for recording the first recorded audio signal obtained by modulating at least the first recording head in the deep portion of the first recording area by using the first magnetic head, and at least modulating the input video signal. Video signal recording means for subsequently recording the obtained recorded video signal on the surface layer of the first recording area by using a second magnetic head having an azimuth angle different from that of the first magnetic head, and the input audio signal. A second recording audio signal obtained by modulating at least the signal is recorded in the second recording area by using a third magnetic head.
Sound signal recording means and first sound signal reproducing for reproducing and outputting a first output sound signal by at least demodulating a signal reproduced from the deep portion of the first recording area by using the first magnetic head. Means and the second layer from the surface layer of the first recording area.
Video signal reproducing means for demodulating at least a signal reproduced by using the magnetic head and reproducing and outputting an output video signal, and at least demodulating a signal reproduced by the third magnetic head from the second recording area. A video / audio signal magnetic recording / reproducing apparatus comprising: second audio signal reproducing means for reproducing and outputting a second output audio signal.

A video / audio signal magnetic recording medium in which a modulated video signal and a modulated audio signal are recorded, and the modulated audio signal is recorded in a deep portion of the first recording area. A video / audio signal magnetic recording medium characterized in that a modulated video signal is recorded in a surface layer portion of the first recording area and a modulated audio signal is recorded in a second recording area. .

[0010]

FIG. 1 is a block diagram of a video signal recording apparatus according to an embodiment of the present invention, FIG. 2 is a conceptual diagram for explaining frequency allocation, and FIG. 3 is an arrangement of magnetic heads on a rotary drum. FIG. 4 is a conceptual diagram for explaining a magnetic tape pattern, and FIG. 5 is a block diagram of a video signal reproducing apparatus according to an embodiment of the present invention. Embodiments will be described below with reference to the drawings.

The outline of this embodiment is divided into two by dividing the video signal into two.
In addition to recording using a track, one dedicated track for audio signals is provided, a recording PCM in which the audio signal is converted into PCM is recorded, and an FM modulation is performed in the deep layer of one track related to the video signal. The audio signal is recorded. In addition, the recording P
Only the CM audio signal is rewritten.

A magnetic recording apparatus for recording / reproducing a high-definition signal will be described with reference to FIG. In the figure, a Y signal aa (luminance signal) and PB, PR signals b
b and cc (color signals) are supplied to the dividing means 1 via an A / D converter (not shown). Here, the Y, PB, and PR signals are signals conforming to the domestic high-definition signal standard,
It is a signal converted from the R, G, B signals by the following equation.

Y = 0.7154G + 0.0721B + 0.2125R PB = 0.5389 (-0.7154G + 0.9279B-0.2125R) PR = 0.6349 (-0.7154G-0.0721B + 0.7875R) The above dividing means 1 outputs Y signal aa (luminance signal). PB, PR
It plays a role of dividing the signals bb and cc into two systems. This division processing is performed for Y, PB, PR signals aa, bb, cc (HD
A signal corresponding to the MUSE signal in which the synchronizing signal and the lines related to the upper and lower sides of the screen are deleted from the TV signal) is generated, and this signal is divided into system signals. The first Y signal 1a, the first PB signal 1b, the first PR signal 1c and the second Y signal 1d, the second PB signal 1e, and the second PR signal 1f obtained by dividing in this way And are supplied to the first and second recording processing means AA and BB.

The first and second recording processing means AA, BB
Have the same configuration, the description of the second recording processing means BB will be omitted here, and the first recording processing means AA will be described. The first PB and PR signals 1b and 1c are supplied to the line-sequential conversion means 2, converted into the first line-sequential color signal, and then supplied to the TCI conversion means 3. On the other hand, the first Y signal 1a is also supplied to the TCI conversion means 3. And TC
The I conversion means 3 time-compresses the first line-sequential color signal and the first Y signal 1a, respectively, and then time-multiplexes both of them to obtain a first TCI signal D / not shown. It is supplied to the FM modulation means 4 via the A converter, where it is subjected to FM modulation to obtain a recorded FM video signal 4a. Then, the recording FM video signal 4a is amplified to a predetermined level by a recording amplifier (not shown), then supplied to the magnetic head A1 via the rotary transformer RT, and recorded on the magnetic tape T using this.

Next, the audio signal recording system will be described. In this embodiment, there are two systems, a signal processing system for recording using FM modulation and a signal processing system for PCM encoding and recording.

First, a signal processing system for recording using FM modulation will be described. A first audio signal dd for the R channel and a second audio signal ee for the L channel are supplied to recording noise reduction means 5 and 6 from a transmission line (not shown), respectively, and recording noise reduction processing such as emphasis is performed here. After that, predetermined FM modulation is performed by the FM modulators 7 and 8. Then, the recording FM audio signal 9a obtained by frequency-multiplexing the output signals of the FM modulators 7 and 8 by the adder 9 is amplified to a predetermined level by a recording amplifier (not shown), and then the magnetic head is passed through the rotary transformer RT. C1
And is recorded on the magnetic tape T using this.

On the other hand, in a signal processing system for recording using PCM encoding, the first audio signal dd for the R channel and the second audio signal ee for the L channel are A / A through a transmission line (not shown). It is supplied to the encoding means 12 via the D converters 10 and 11. The encoding means 12 combines both input signals and performs well-known encoding such as Reed-Solomon encoding. Then, the recording PCM audio signal 13a obtained by modulating the output signal of the encoding means 12 by the modulating means 13 such as 4-phase PSK or EFM is supplied to the selecting means 14.

The selecting means 14 supplies the recording PCM audio signal 13a to the magnetic heads D1 and D2 during normal recording, and supplies the recording PCM audio signal 13a to the magnetic heads E1 and E2 during post-recording. That is, the output signals 14a and 14b of the selecting means 14 are amplified to a predetermined level by a recording amplifier (not shown), and then the rotary transformer R
The magnetic tape T is selectively supplied to the magnetic heads D1 and D2 or the magnetic heads E1 and E2 via the magnetic tape T.
Are recorded respectively.

Now, the frequency allocation will be described with reference to FIG. 2. FIG. 1A shows the frequency allocation related to the voice signal, and the carrier of 1.3 MHz and 1.7 MHz shown in the figure. A recorded FM audio signal 9a relating to the L and R channels exists in a band of ± 150 KHz around the frequency, and a recorded PCM audio signal 13a exists in a band of ± 1 MHz around a carrier frequency of 3 MHz. .

On the other hand, FIG. 3B shows the frequency allocation relating to the video signal, and the same frequency allocation is used in the first and second recording processing means AA and BB. That is, the recorded FM video signal 4a is a deviation having a sync tip level of 8 MHz and a white peak level of 10 MHz and an occupied band from 2 MHz to 16 MHz.

The frequency allocation thus obtained is used for recording on the magnetic tape by using the above-mentioned magnetic head. Here, the arrangement of the magnetic head on the rotating drum will be described with reference to FIG. As shown in FIG. 1A, magnetic heads C2, D2, which have opposite azimuth angles at positions 180 degrees opposite the magnetic heads C1, D1, A1, B2.
A2 and B1 are attached.

The azimuth angles of the magnetic head C1 for recording the FM-modulated audio signal and the magnetic head D1 for recording the PCM-encoded audio signal are substantially the same azimuth angle, for example, +30 degrees. Is. Also,
The azimuth angles of the magnetic heads A1 and B2 for recording video signals are, for example, +15 degrees and -15 degrees.

Then, recording is performed in the order of the illustrated rotation direction in FIG. As a matter of course, the magnetic heads C1 and D1 may be double azimuth heads as shown in FIG.

The tape pattern formed with the magnetic head arrangement shown in FIG. 3A will be described with reference to FIG. The magnetic head C1 records the FM-modulated audio signal in the deep layer portion of the video track prior to the magnetic head B2, and then the video signal is overwritten on the surface layer portion by the magnetic head B2. On the other hand, PCM for audio-only tracks
The encoded audio signal is recorded using the magnetic head D1. Here, the lower end edge P of the track formed by the magnetic head C1 is formed to be located, for example, “2 μm” above the lower end edge Q of the video track, and the upper end edge R of the track formed by the magnetic head C1. Are formed so as to protrude above the upper edge S of the video track. The tracks are formed in this manner in order to prevent crosstalk between the two tracks, which occurs due to the azimuth angle directions of the magnetic head A1 and the magnetic head C1 being the same, and the use of the magnetic head D1. This is to enlarge the recording area of the recorded FM audio signal when the recorded PCM audio signal is not recorded. The head width of the magnetic head shown in FIG. 4 is shown to be substantially the same as the track width, but it goes without saying that it may exceed this.

Next, the video signal reproducing apparatus will be described with reference to FIG. The signal reproduced from the magnetic tape T using the magnetic heads A1 and B2 and the magnetic heads A2 and B1 (not shown) is supplied to a preamplifier (not shown) via a rotary transformer RT, amplified to a predetermined level, and then output. The signal is supplied to the first and second reproduction processing means CC and DD. Since the first and second reproduction processing means CC and DD have the same configuration, only the first reproduction processing means CC will be described.

The output signal of the preamplifier is supplied to the FM demodulation means 20 in the first reproduction processing means CC, and the FM demodulated signal is complemented with the TCI conversion means 3 via an A / D converter (not shown). Are supplied to the TCI inverse conversion means 21 having a physical relationship.

Then, the TCI inverse conversion means 21 expands the compressed line-sequential color signal and the compressed luminance signal respectively to reproduce Y signal and reproduced line-sequential color signal which are combined means 23 and line-sequential inverse conversion means. 22 and 22 respectively. The reproduced PB signal and the reproduced PR signal, which have been subjected to the line-sequential demodulation by the line-sequential inverse conversion means 22, are supplied to the synthesizing means 23. Then, the synthesizing means 23 having a complementary relationship with the above-mentioned dividing means 1 makes the first reproduction Y, PB, PR signals and the second reproduction Y relating to the first and second reproduction processing means CC, DD. , PB, PR signals respectively, and reproduced Y, PB, PR signals ff,
It outputs gg and hh to a transmission line (not shown).

Next, the audio signal reproduction system will be described. This embodiment has two systems, a signal processing system for reproduction using FM demodulation and a signal processing system for PCM decoding and reproduction.

First, a signal processing system for reproducing using FM demodulation will be described. A signal reproduced from the magnetic tape T by using the magnetic head C1 and the magnetic head C2 (not shown) is supplied to a preamplifier (not shown) via a rotary transformer RT, amplified to a predetermined level, and then the output signal thereof is 1. Three
± 150KH centered on MHz and 1.7MHz
Bandpass filter 2 for extracting each frequency component of z
The output signals 24a and 25a relating to the L and R channels obtained via the channels 4 and 25 are supplied to the FM demodulation means 27 and 28, respectively. Then, the L and R channels obtained by performing noise reduction such as de-emphasis on the signals obtained by FM demodulating the output signals 24a and 25a by the FM demodulation means 27 and 28, respectively, by the reproduction noise reduction means 27 and 28. The first L, Rch output audio signals ii, jj according to the above are output to a transmission line (not shown).

On the other hand, in the signal processing system for reproducing using PCM decoding, the magnetic head D1 is used instead of the magnetic tape T.
And a magnetic head D2 (not shown) are supplied to a preamplifier (not shown) via a rotary transformer RT to amplify the signal to a predetermined level, and then output the output signal to 3M.
A signal obtained through the bandpass filter 26 that extracts the frequency components of ± 1 MHz with the center frequency of Hz is supplied to the demodulation means 31. Then, the demodulation means 31 performs 4-phase PSK or EFM demodulation of the output signal of the bandpass filter 26, and the decoding means 32 performs well-known decoding such as Reed-Solomon decoding on the signal L. Second L and Rch output audio signals kk and ll related to R and R channels
Is output to a transmission line (not shown).

In the above-mentioned embodiment, when the cross-modulation distortion of the recorded FM voice signal 9a and the recorded PCM voice signal 13a does not pose a problem, the signals obtained by frequency-multiplexing both are used by the magnetic heads C1 and C2. Magnetic head D
Of course, 1 and D2 may be omitted. Further, when the crosstalk of the bias signal does not cause a problem, it goes without saying that the signal obtained by frequency-multiplexing may be bias-recorded.

In the above-described embodiment, a high-definition signal and a conventional video signal (for example, NTSC signal, PAL signal) are used.
In the case of recording / reproducing also as a signal), a known VHS system or S-VHS system configuration may be added to the configuration of the above-described embodiment. In such a case, configurations 5 to 13 and 24 to
It goes without saying that the magnetic heads C1 and C2 may be used in addition to being used as the magnetic head 34.

In the above-mentioned embodiment, since the recorded FM audio signal 9a and the recorded PCM audio signal may be signals having different frequency bands, it goes without saying that they may be information signals having different frequency bands. Is.

[0034]

As described above, according to the configuration of the magnetic recording apparatus for video and audio signals according to the present invention, in particular, the first recording audio signal obtained by at least modulating the input audio signal is stored in the first recording area. A first audio signal recording means for performing prior recording using the first magnetic head in a deep layer of the recording medium, and a recording video signal obtained by modulating at least the input video signal at an azimuth angle different from that of the first magnetic head. A second recording audio signal obtained by modulating at least the input audio signal by a video signal recording means for performing subsequent recording on the surface layer portion of the first recording area using the second magnetic head Since the second recording area has the second audio signal recording means for recording using the third magnetic head, the first and second recording audio signals can be recorded separately in different recording areas. Bias the intermodulation distortion between the second recorded audio signals No. can be suppressed without using a further, it is possible to prevent the crosstalk to the video signal of the bias signal, there is an effect that it provides a magnetic recording medium which records a high-quality video and audio signals.

As described above, according to the configuration of the video / audio signal magnetic reproducing apparatus of the present invention, it is possible to reproduce high-quality video and audio signals.

As described above, according to the configuration of the video / audio signal magnetic recording / reproducing apparatus of the present invention, it is possible to provide a magnetic recording medium on which a high-quality audio signal and video signal are recorded, and
There is an effect that a high-quality audio signal and video signal can be reproduced.

As described above, according to the configuration of the video / audio signal magnetic recording medium of the present invention, the modulated audio signal is recorded in the deep portion of the first recording area, and the first recording area is recorded. Since the modulated video signal is recorded in the surface layer part of and the modulated audio signal is recorded in the second recording area, when the video / audio signal magnetic recording medium is reproduced, Since it is possible to reproduce a video signal having no intermodulation distortion and no crosstalk of the bias signal, it is possible to provide a high quality audio signal and video signal.

[Brief description of drawings]

FIG. 1 is a block diagram of a video signal recording apparatus according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram for explaining frequency allocation.

FIG. 3 is a plan view for explaining the arrangement of magnetic heads on a rotating drum.

FIG. 4 is a conceptual diagram for explaining a magnetic tape pattern.

FIG. 5 is a block diagram of a video signal reproducing device according to an embodiment of the present invention.

[Explanation of symbols]

9a Recording FM audio signal (first recording audio signal) 13a Recording PCM audio signal (second recording audio signal) aa Y signal (input video signal) bb PB signal (input video signal) cc PR signal (input video signal) dd First audio signal (input audio signal) ee First audio signal (input audio signal) ff Playback Y signal (output video signal) gg Playback PB signal (output video signal) hh Playback PR signal (output video signal) ii First Lch output audio signal (first output audio signal) jj First Rch output audio signal (first output audio signal) kk Second Lch output audio signal (second output audio signal) ll Second Rch output audio signal (second output audio signal) A1, A2 magnetic head (first magnetic head) C1, C2 magnetic head (second magnetic head) D1, D2 magnetic head (third magnetic head) Head) T magnetic tape (magnetic recording medium, the video and audio signal magnetic recording medium)

Claims (4)

[Claims] 1. A video / audio signal magnetic recording apparatus for simultaneously recording an input video signal and an input audio signal on a magnetic recording medium, wherein a first recorded audio signal obtained by at least modulating the input audio signal is converted into a first recorded audio signal. A first audio signal recording means for performing prior recording using the first magnetic head in a deep portion of the recording area of, and a recording video signal obtained by at least modulating the input video signal,
The second magnetic head having an azimuth angle different from that of the first magnetic head is used, and a video signal recording means for performing subsequent recording on the surface layer portion of the first recording area and the input audio signal are modulated at least. A video / audio signal magnetic recording apparatus comprising: a second audio signal recording means for recording a second recording audio signal in a second recording area by using a third magnetic head. 2. A first reproducing audio signal is reproduced and output by at least demodulating a signal reproduced from the deep portion of the first recording area of the magnetic recording medium by using the first magnetic head.
Sound signal reproducing means, and a video signal reproducing means for demodulating at least a signal reproduced from the surface layer portion of the first recording area of the magnetic recording medium using the second magnetic head to reproduce and output an output video signal. And a second audio signal reproducing means for at least demodulating a signal reproduced from the second recording area of the magnetic recording medium by using the third magnetic head and reproducing and outputting a second output audio signal. A video / audio signal magnetic reproducing device characterized by the above. 3. A video / audio signal magnetic recording / reproducing apparatus for simultaneously recording an input video signal and an input audio signal on a magnetic recording medium and reproducing the output video signal and the output audio signal from the recording medium at the same time. First audio signal recording means for recording the first recorded audio signal obtained by modulating the signal at least in the deep portion of the first recording area by using the first magnetic head, and at least the input video signal. The recorded video signal obtained by modulation is
The second magnetic head having an azimuth angle different from that of the first magnetic head is used, and a video signal recording means for performing subsequent recording on the surface layer portion of the first recording area and the input audio signal are modulated at least. Second audio signal recording means for recording the second recording audio signal in the second recording area by using the third magnetic head, and the first magnetic head from the deep portion of the first recording area. And a signal reproduced from the surface layer portion of the first recording area by using the second magnetic head by demodulating at least the signal to be reproduced and reproducing and outputting the first output audio signal. And a video signal reproducing means for reproducing and outputting an output video signal by demodulating at least a signal, and a signal for reproducing a second output audio signal by at least demodulating a signal reproduced from the second recording area by using a third magnetic head. Second audio signal reproducing means for A video / audio signal magnetic recording / reproducing apparatus comprising: 4. A video / audio signal magnetic recording medium in which a modulated video signal and a modulated audio signal are recorded, wherein the modulated audio signal is recorded in a deep portion of the first recording area. The modulated audio signal is recorded in the surface layer part of the first recording area, and the modulated audio signal is recorded in the second recording area. recoding media.