JP3010742B2 - Rotating head type magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary head type magnetic recording / reproducing apparatus, and more particularly to a multi-mode video information and a multi-mode video information reproducing apparatus.
The present invention relates to a system for recording or reproducing audio information accompanying or related thereto .

[0002]

2. Description of the Related Art In recent years, as a next-generation television system, a high-definition television in which the number of horizontal scanning lines is increased to twice or more that of a conventional television system has attracted attention. In Japan, experimental broadcasting is performed based on the Hi-Vision system having 1125 scanning lines and developed mainly by the Japan Broadcasting Corporation.
For the full-fledged diffusion of Hi-Vision, not only a receiver for receiving Hi-Vision but also a home VTR for recording broadcast is essential. In addition to a receiver for receiving high-definition television, a home VTR for recording broadcasts is essential. In high-definition broadcasting, digital audio with excellent sound quality is transmitted in accordance with the high-quality image quality. Therefore, in a home high-definition VTR corresponding to a next-generation television represented by high-definition television, it is required that sound can be digitally recorded.

[0003] Further, as a consumer's need, when a home-use high-definition VTR is introduced into the market, it is desired that the VTR be compatible with a conventional home-use VTR, especially a VHS type VTR which is currently the most widely used. It is. The compatibility referred to here means that if a high-quality VTR designed according to a certain format is on the market,
That is, the tape recorded by the HS system can be reproduced in some form.

[0004] Conventionally, as a method of recording a digital audio signal, a so-called PCM audio signal, in a home VTR, a tape wrap angle of 180 ° or more with respect to a cylinder, which is employed in 8 mm video, is used.
An overlap PCM system for recording M audio signals in an overlap area of a tape is known. However, when this system is applied to another home VTR, for example, a VHS system VTR, a change in the tape winding angle causes a different recording pattern on the tape, which causes a problem that compatibility with the conventional system is lost. .

As a means for solving the above problem, as disclosed in Japanese Patent Application Laid-Open No. 63-171402, a PCM audio signal is modulated by a carrier having a lower frequency than a video signal, and the modulated audio signal is modulated. It is known that a video signal is recorded below the video signal in the thickness direction of the tape by using a dedicated audio head having a different azimuth angle from the video signal head. According to such a so-called deep recording method, PCM audio can be recorded without changing the recording pattern of the conventional video signal.

[0006]

However, the above-mentioned deep recording method has a problem that a dedicated head is required for recording and reproducing the audio signal. In a home high-definition VTR as described above, for example, when compatibility with a VHS system VTR is to be maintained, a head to be mounted on a cylinder includes a video head and a sound head for recording and reproducing a high-definition television signal. The number of heads, video heads and audio heads for recording / reproducing the current television signal becomes very large, resulting in an increase in cost and a particularly serious problem. Furthermore, as the number of heads on the cylinder increases, the impact error due to tapping of the heads increases, resulting in distortion on the playback screen, and the image quality is significantly degraded especially in recording and playback of high-definition television signals that require high image quality. This causes a problem.

In view of the above-mentioned problems of the prior art, the present invention provides a VTR capable of supporting a plurality of modes, the number of heads on a cylinder which has been increased to ensure compatibility with a conventional home VTR. It is an object of the present invention to provide a VTR in which the technical means for reducing the number of heads is reduced, the cost increase is suppressed as much as possible, and the above-described image quality deterioration due to the increase in the number of heads is reduced.

[0008]

In order to achieve the above object, the present invention has the following configuration. That is, the magnetic tape
Record information on tape or reproduce information from magnetic tape
Rotating magnetic recording and reproducing apparatus,
Image information and first audio information accompanying the first video information.
A first mode for recording or reproducing information, and a second mode for recording or reproducing information.
Information, and second audio information accompanying the second video information.
Record or play back and switch to the first mode
And a second mode.
Recording or reproducing the first video information,
A first magnetic head whose absolute value forms a first angle;
The first audio information is recorded or recorded in the first mode.
Plays back and, in the second mode, the second video
Recording or reproducing image information and the second audio information,
A second azimuth angle having an absolute value different from the first angle;
And a second magnetic head forming an angle.
You. If the azimuth angle is ± 6 °, for example,
The log value is 6 °.

[0009]

According to the above means, in the first mode, the voice
A head for recording or reproducing information and a second mode
To record or play back audio and video information
Mode, for example, the first mode
Compatibility with all VHS VTRs, and
A dual-mode VTR capable of recording and reproducing high-definition television signals as the mode can be realized with a simple configuration having a minimum of four heads.

At this time, since the number of heads on the cylinder can be reduced by the above-mentioned means, the deterioration of the image quality due to the impact jitter caused by so-called tape beating due to the increase in the number of heads is also reduced. It becomes possible.

[0011]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention, in which a high-definition signal is used as an example of a next-generation high-definition television signal, and an NTSC signal is used as an example of a current television signal.
1 shows the configuration of a VTR recording system capable of recording video signals and audio signals of respective signals.

In FIG. 1, reference numerals 1, 2, 3, and 4 denote input terminals for a Hi-Vision signal, which are input terminals for a luminance signal Y, color signals Pb and Pr, and a synchronizing signal S, respectively. 5 is a high-definition video signal processing circuit, 6 and 7 are input terminals of audio signal left channel L and right channel R, 8 is a PCM audio signal processing circuit, 9 is an addition circuit,
10 is a changeover switch, 11 is a recording amplifier, 15, 1
Reference numeral 6 denotes a magnetic head for recording or reproducing a Hi-Vision signal and a PCM audio signal, 12 an input terminal for an NTSC signal, 13 a processing circuit for the NTSC signal, 14 a recording amplifier, and 17 and 18 for recording or reproducing the NTSC signal. 19 is a magnetic tape, 20 and 21 are input terminals of a sub audio signal left channel L ′ and right channel R ′, respectively, 22 is a Hi-Fi audio signal processing circuit,
3 is a bias oscillation circuit, and 24 is an addition circuit.

FIG. 2 is a diagram showing an arrangement of a magnetic head on a rotary cylinder.

In FIG. 2, reference numeral 30 denotes a rotary cylinder, and other components are the same as those shown in FIG. Here, the azimuth angles of the magnetic heads 15 and 16 are + 30 ° and −30 °, respectively, while the azimuth angles of the magnetic heads 17 and 18 are + 6 ° and −6 °, respectively. Further, as shown in FIG. 2, the four heads are arranged at positions each making an angle of 90 ° with the cylinder rotation angle.

Referring to FIG. 1, the case of recording a high-vision signal will be described first. Luminance signal Y, color signals Pb, Pr, input from input terminals 1, 2, 3, 4 respectively.
And the synchronization signal S are output from the high-definition video signal processing circuit 5.
Sent to FIG. 3 shows a configuration example of the high-definition video signal processing circuit 5. In FIG. 3, reference numerals 51, 52, and 53 denote A / D converters for A / D converting the luminance signal Y and the chrominance signals Pb and Pr, respectively. Reference numeral 54 denotes a line-sequential color signal for converting the two color signals. 55, a timing signal generating circuit for generating each timing signal using the synchronization signal S as a reference for the time axis, and 56, having a predetermined capacity, for compressing and multiplexing the line-sequential color signal and the luminance signal on the time axis. Processing (Time
Compressed Integration-T
A memory 57 for CI processing) is an FM modulation circuit for FM modulating the video signal (referred to as a TCI signal) after the time axis compression multiplex processing. FIG. 4 shows one form of the TCI signal. The TCI signal is a video signal in which a negative sync signal, a burst signal for detecting a time axis error during reproduction, a line-sequential color signal and a luminance signal are multiplexed on the time axis as shown in FIG. This is a signal form that is often used for transmission and recording of high-definition television signals such as signals. The video signal processed by the high-definition video signal processing circuit 5 having the above configuration and function is input to the addition circuit 9.

On the other hand, the audio signal accompanying the Hi-Vision video signal is, for example, in the case of two stereo channels,
The signal is input from each of the left channel input terminal 6 and the right channel input terminal 7 and sent to the PCM audio signal processing circuit 8. FIG. 5 shows a configuration example of the PCM audio signal processing circuit. In FIG. 5, reference numerals 81 and 82 denote A / D converters for A / D-converting the audio signals input from the left channel input terminal and the right channel input terminal, respectively, and 83 denotes an error correction for the input digital signal. A digital signal processing circuit 84 for performing processing such as adding a code is a four-phase phase modulation circuit (QPSK modulation circuit) for converting the processed signal into a signal that can be easily recorded on a tape.
The audio signal processed by the PCM audio processing circuit having the above configuration and function is input to the addition circuit 9.

In the adder circuit 9, the analog adder circuit frequency-multiplexes the high-definition signal after the FM modulation and the PCM audio signal after the four-phase modulation. FIG. 6 is a diagram showing the arrangement of the multiplexed video signal and audio signal on the frequency axis. The video signal is FM-modulated as described above, and its frequency allocation is set to, for example, 20 MHz at the synchronization tip and 28 MHz at the white peak.
On the other hand, the carrier frequency of the modulated PCM audio signal is 2.
5 MHz, and the occupied bandwidth is ± 1.3 MHz. By adopting such a frequency arrangement, it is possible to record the video signal and the PCM audio signal with the same head by reducing the interference between the video and the audio to a level at which there is no practical problem. Next, this addition signal is sent to the recording amplifier 11 via the changeover switch 10. The recording amplifier 11 amplifies the input signal to a level suitable for recording, and supplies the recording signal to the magnetic heads 15 and 16.

As described above, the magnetic heads 15 and 16 have azimuth angles of + 30 ° and -30 °, respectively. At this time, when the cylinder 20 has a relatively small diameter, that is, for example, the diameter is the same as that of the VHS type VTR 62.
mm, when a high frequency signal as described above is recorded at a normal rotation speed (1800 r / min), the relative speed between the tape and the head is as low as 5.8 m / sec. As a result, the wavelength is as short as 0.2 μm, making it difficult to obtain a sufficient SN ratio. For this reason, in this embodiment, the recording wavelength is reduced by increasing the rotation speed of the cylinder to four times (7200 r / min) the normal rotation speed and increasing the relative speed between the tape heads to 23.4 m / sec. Wavelength shift is prevented, and SN degradation is prevented. In the VTR of this embodiment, the wavelength corresponding to the white peak of the video signal is about 0.83 μm, which is a sufficiently practical value for recording and reproducing a high-vision signal requiring a high SN ratio.

FIG. 7 is a diagram showing a track pattern on a tape at the time of recording a Hi-Vision signal. With the quadruple rotation of the cylinder, one field of the video signal is divided into four portions (referred to as segments) in units of horizontal scanning lines, and each segment is recorded on a corresponding track. As a result, one field is dispersedly recorded on a total of four tracks. Such a recording method is called a segment recording method, and its detailed technical contents are disclosed in, for example, JP-A-61-029283. In FIG. 7, the first field is dispersedly recorded on four tracks indicated by 1, 2, 3, and 4, and the second field is recorded on four tracks indicated by 1 ', 2', 3 ', and 4'. Tracks are recorded in a distributed manner. Further, + and-in the figure indicate the positive and negative head azimuth angles corresponding to the track. In the segment recording method, video signals in one continuous field are dispersedly recorded on a plurality of tracks.
There is a problem that a temporal discontinuity occurs in a reproduced video signal of one field due to a head change occurring between tracks. To solve this problem, as described in detail in the above-mentioned publication, the blacking period of about 1 to 2H (the video signal is not recorded) at the entrance and the exit of each track, that is, at the joint of each segment. A period is provided, and head switching is performed during the blanking period, so that no loss or temporal discontinuity of the video signal occurs at all in the recording / reproducing process.

As described above, in this embodiment, when recording or reproducing a Hi-Vision signal (Hi-Vision mode), both the video signal and the PCM audio signal are obtained by using only the two magnetic heads 15 and 16. Can be recorded.

Next, in this embodiment, the case of recording or reproducing a current television signal, for example, an NTSC signal, will be described again with reference to FIG. An NTSC signal to be recorded on the VTR is input from an NTSC signal input terminal 12 and sent to an NTSC video signal processing circuit 13. NT
In the SC signal processing circuit 13, the luminance signal and the chrominance signal included in the input NTSC signal are separated, the luminance signal is subjected to FM modulation, and the chrominance signal is frequency-converted to a low frequency side. FIG. 8 is a diagram showing the frequency arrangement of each signal in the S-VHS system. FIG. 8A schematically shows the spectrum of a luminance signal after FM modulation and the spectrum of a frequency-converted color signal. Thereafter, the FM-modulated luminance signal and the frequency-converted color signal are sent to the recording amplifier 14. The recording amplifier 14 amplifies the signal to a predetermined level suitable for recording, and the signal is amplified by the NTSC video signal recording / reproducing head 1.
7 and 18 and recorded on the magnetic tape 19. The heads 17 and 18 have azimuth angles of + 6 ° and −6 °, respectively, which are different from the azimuth angles ± 30 ° of the high-vision heads 15 and 16 described above.

Next, an audio signal accompanying or related to the NTSC signal is recorded as follows based on a PCM audio recording system of the S-VHS standard and an FM audio recording system, a so-called Hi-Fi audio recording system. That is, the main audio signals L and R of the left and right channels input from the analog audio input terminals 6 and 7 are first converted to the PCM audio signal processing circuit 8.
Is input to As shown in FIG. 5, in the PCM audio processing circuit, the input two-channel main audio signal is converted into a digital signal by an A / D converter in exactly the same manner as in the processing of the audio signal accompanying the Hi-Vision signal. , A code for error correction is added thereto, and then QPSK modulation (four-phase modulation) is performed. The QPSK signal thus obtained is sent to the adding circuit 24. On the other hand, the analog audio input terminal 20,
Left and right two-channel sub audio signal L ′ input from
And R ′ are input to the Hi-Fi audio signal processing circuit 22. In the Hi-Fi audio signal processing circuit, the input 2
The sub audio signals of the channels are respectively 1.3 MHz,
FM modulation is performed using 1.7 MHz as a carrier center frequency. The FM audio signal thus obtained is sent to the adding circuit 24. The 11 MHz bias signal generated by the bias oscillation circuit 23 is further input to the addition circuit 24. This bias signal is for recording both the PCM audio signal and the Hi-Fi audio signal by a bias recording method.
The interference between the audio signal and the Hi-Fi audio signal is suppressed, and S
This is effective in obtaining a reproduced signal having a good N ratio. As a result, the PCM audio signal, the FM audio signal,
Three signals of the bias signal are input, and these three signals are frequency-multiplexed. FIG. 8B shows the frequency allocation of each signal after the frequency multiplexing. The signal output from the adding circuit 24 is sent to the recording amplifier 11 via the ten changeover switches. In the recording amplifier 11, the input signal is amplified to a predetermined level suitable for recording,
The data is recorded on the magnetic tape 19 by the magnetic heads 15 and 16.

FIG. 9 shows a track pattern on a magnetic tape in the S-VHS system. In the figure, a diagonal rectangular part drawn by a solid line is a track on which a video signal is recorded, and a part drawn by a dotted line is a track on which an audio signal is recorded. In the SP mode, the track width of the video track is 58 μm, and the track width of the audio track is often selected to be about 28 μm. At this time, the azimuth angles of the video signal heads 17 and 18 are ± 6 °, the azimuth angles of the audio signal heads 15 and 16 are ± 30 °, and the audio head is one track with respect to the video head. It is arranged to record the signal a minute ahead. FIG. 10 is a diagram schematically showing the magnetization state of the magnetic layer in the deep recording method. FIG.
0, the PCM audio signal and the Hi-Fi
It can be seen that the audio signal is recorded on the deep side with respect to the thickness direction of the magnetic layer of the magnetic tape, and the video signal is recorded on the surface layer side.

FIG. 11 is a diagram showing a configuration of a reproduction system in the VTR of this embodiment.

In FIG. 11, parts having the same part numbers as those shown in FIG. 1 indicate the same parts.

Now, it is assumed that a tape or cassette on which a Hi-Vision signal is recorded has been inserted into this VTR. At this time, the identification of the tape or cassette inserted into the VTR is performed by means such as detection of the spectrum of the signal recorded on the tape, identification of the shape of the cassette half, or detection of the identification hole provided in the cassette half. The playback system is set to the high definition playback mode. The reproduction mode detection means 100 detects the reproduction mode. In the Hi-Vision playback mode, the number of rotations of the cylinder is quadrupled, that is, 720 times.
0 r / min is set, and reproduction is performed using the magnetic heads 15 and 16. The Hi-Vision signal reproduced from the magnetic tape 19 by the magnetic heads 15 and 16 is amplified to a predetermined level by the reproduction preamplifier 110 and sent to the switch 111. Changeover switch 1
Reference numeral 11 is switched according to the detection result of the reproduction mode detection means 100, and the switch is switched upward in the high-definition mode. Switch 111
Is sent to a separation circuit 112, where it is separated into a Hi-Vision signal recorded on the high frequency side and a PCM audio signal recorded on the low frequency side. The high-vision signal is sent to the high-vision video signal reproduction processing circuit 114, while the PCM audio signal is sent to the PCM audio signal reproduction processing circuit 115. In the two signal processing circuits, predetermined processing is performed on the input signals, and the luminance signal Y from the output terminal 117 of the high-definition video signal reproduction processing circuit 114 and the terminals 118 and 119
, The color signals Pb and Pr from the terminal 120, and the synchronization signal S from the terminal 120.
Is output. The PCM audio signal reproduction processing circuit 11
5 output terminals 121 and 122 output a left channel audio signal L and a right channel audio signal R, respectively.

Next, the operation when a tape (cassette) on which an NTSC signal is recorded is inserted into the VTR according to the S-VHS system will be described. In this case, first, the type of signal recorded on the tape is identified by the reproduction mode detecting means 100, and it is detected that the signal is an NTSC signal. The rotation speed of the cylinder is 1
The speed is set to 800 r / min, and the magnetic heads 15 and 16 reproduce the PCM audio signal and Hi-Fi audio signal recorded on the deep layer of the tape from the tape 19, and send these signals to the reproduction preamplifier 110. The reproduction preamplifier 110 amplifies the input signal to a predetermined level and sends it to the changeover switch 111. In the S-VHS mode, the changeover switch 111 is down, and the reproduced signal is sent to the separation circuit 113. The separation circuit 113 separates the PCM audio signal and the Hi-Fi audio signal from the reproduced signal, and separates the PCM audio signal reproduction processing circuit 11
5, which is sent to the Hi-Fi audio signal processing circuit 116. In these two processing circuits, predetermined processing is performed on the input signals, and the main audio signals L and R are output from the main audio signal output terminals 121 and 122 from the PCM audio signal reproduction processing circuit 115. You. Also, Hi-Fi
The sub-audio signals L ′ and R ′ are output from the sub-audio signal output terminals 123 and 124 from the audio signal reproduction processing circuit 116. On the other hand, the NTSC video signal is transmitted to the magnetic heads 17, 1
After being reproduced by the reproduction preamplifier 130 and amplified to a predetermined level by the reproduction preamplifier 130, it is subjected to predetermined processing by the NTSC video signal reproduction processing circuit 131 and output to the video signal output terminal 132.

As described above, in the VTR of this embodiment, the operation mode of the VTR is determined according to the type of the video signal input to the VTR or the type of the video signal recorded on the magnetic tape during recording and reproduction. It is possible to record and reproduce the video signal and the audio signal for any of the HDTV signal and the current television signal.

FIG. 12 is a diagram showing the configuration of a recording system according to another embodiment of the present invention. In FIG. 12, parts having the same part numbers as those in FIG. 1 are parts having the same function. In FIG. 12, the TCI signal output from the high-definition video signal processing circuit 5 is further input to a time axis compression circuit 101, where time axis compression processing is performed according to a predetermined compression ratio. On the other hand, the PCM audio signal output from the PCM audio signal processing circuit 8 is also temporarily input to the time axis compression circuit 102, where it is subjected to time axis compression processing. These two time axis compression circuits 101 and 102
The output signal is a two-input switch 103
And time-division multiplexed.

FIG. 13 is a waveform diagram schematically showing the above-described time axis compression and time axis multiplexing processing. (A) of FIG.
The portion indicated as a video signal for one track indicates the time length of the TCI signal to be recorded in one track, and corresponds to a rotation angle of the cylinder of 180 °. The TCI signal is time-axis-compressed by the time-axis compression circuit 101 at a compression ratio of 5/6 as shown in FIG. Therefore, the length of the compressed TCI signal is equivalent to 150 ° in the cylinder rotation angle. On the other hand, as a result of compressing the time axis of the TCI signal as described above,
An empty space is formed in a portion of one track at a cylinder rotation angle of 30 °. P output from the time axis compression circuit 102
The CM audio signal is compressed so that it can be recorded in this 30 ° portion. That is, the compression ratio of the PCM audio signal is 1/6.
Becomes At this time, the modulation method of the PCM audio signal is
The most suitable digital modulation method is selected in consideration of the data transmission rate after compression, the frequency and the wavelength of the signal recorded on the tape, and the like, without being limited to the four-phase phase modulation method as shown in FIG. FIG. 13C shows T after the time axis compression.
FIG. 5 shows a recording signal after a CI signal and a PCM audio signal are time-division multiplexed. In FIG. 12, the time axis multiplexed signal is output from the changeover switch 103 and sent to the recording amplifier 11 via the changeover switch 10. The other components in FIG. 12 operate exactly the same as in FIG.

FIG. 14 is a diagram showing a recording pattern on a tape of a Hi-Vision signal and an accompanying or related audio signal in the embodiment described above. In FIG. 14, each track is divided into two parts, and the head entry side is a recording area for video signals, while the hatched part on the head exit side is an area for recording audio signals. The numbers shown in the tracks indicate the segment numbers in one field, and are 1, 2, 3, 4
Represents each segment in the first field as 1 ′, 2 ′,
3 'and 4' indicate each segment in the second field. (+) And (-) written in the track indicate the azimuth angles of the head corresponding to the track d. If the video signal and the audio signal are recorded by the area division method as shown in FIG. 14, it is possible to support a so-called post-recording function in which only the audio signal is recorded later on the recorded tape.

FIG. 15 is a diagram showing another embodiment for realizing the after-recording function. The time axis compression ratio of the time axis compression circuit 101 in FIG. 12 is 1, that is, the time axis compression is performed for the TCI signal. No time axis compression circuit 102
4 shows a recording pattern on a tape when the compression ratio is set to, for example, 1/9. In one track in FIG. 15, the video signal recording area corresponds to a cylinder rotation angle of 180 °, and the PCM audio recording area indicated by oblique lines corresponds to 20 °. This PCM audio recording area can be secured by using a linear audio recording area in a VHS VTR as shown in the figure, and PCM audio recording by a so-called overlap method can be realized. Also, according to this method, VHS system VTR
, It is not necessary to change the lead angle of the cylinder, and therefore, the overlap recording can be realized while maintaining the compatibility with the VHS system VTR.

As described above, in the present embodiment, when recording and reproducing a Hi-Vision video signal and a PCM audio signal accompanying the same, the magnetic heads 15 and 16 having an azimuth angle of ± 30 ° are used and the NTSC When recording and reproducing a video signal, a PCM audio signal associated therewith, and a Hi-Fi audio signal, a magnetic head having an azimuth angle of ± 6 ° for a video signal according to the standard of the S-VHS system VTR. The magnetic heads 15, 1 having an azimuth angle of ± 30 ° are used for audio signals.
6 is used. With such a configuration, recording and reproduction of a high-definition signal and NTS
For recording and reproducing the audio signal of the C signal by the deep recording method,
The same head having the same azimuth angle and track width can be used. As a result, the four magnetic heads 1
With a very simple configuration of 5, 16, 17, 18
Video signals and audio signals in two modes, HDTV and NTSC, can be recorded and reproduced.

[0035]

As described above, according to the present invention, the circuit
Head mode magnetic recording / reproducing device
Of video information and accompanying audio information
Recording and reproduction can be realized with a small number of heads by the same mechanism . Further, as the number of heads on the cylinder decreases, the jitter of the impact induced by the so-called tape beating can also be reduced, so that there is an effect of improving the image quality of the reproduced image.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a recording system showing an embodiment of the present invention.

FIG. 2 is a diagram illustrating the arrangement of heads on a cylinder.

FIG. 3 is a configuration diagram of a high-definition video signal recording processing circuit.

FIG. 4 is a diagram showing a form of a TCI signal.

FIG. 5 is a configuration diagram of a PCM audio signal processing circuit.

FIG. 6 is a diagram showing a frequency arrangement of each signal in a high definition mode.

FIG. 7 is a diagram showing a track pattern on a tape at the time of Hi-Vision recording.

FIG. 8 is a diagram illustrating a frequency allocation of each signal in the S-VHS mode.

FIG. 9 is a diagram showing a track pattern on a tape in S-VHS.

FIG. 10 is a sectional view of a tape magnetic layer.

FIG. 11 is a configuration diagram of a reproduction system showing one embodiment of the present invention.

FIG. 12 is a configuration diagram of a recording system showing another embodiment of the present invention.

FIG. 13 is a diagram illustrating a time axis multiplexing process of a video signal and an audio signal.

FIG. 14 is a diagram showing a track pattern on a tape when recording a Hi-Vision signal according to another embodiment of the present invention.

FIG. 15 is a diagram showing a track pattern on a tape when a Hi-Vision signal is recorded in another embodiment of the present invention.

[Explanation of symbols]

1 ... luminance signal Y input terminal, 2 ... color signal Pb input terminal,
3 ... color signal Pr input terminal, 4 ... synchronization signal S input terminal, 5
... High-definition video signal processing circuit, 6 ... Main audio signal Lc
h input terminal, 7: main audio signal Rch input terminal, 8: PC
M audio signal processing circuit, 9 addition circuit, 10 changeover switch, 11 recording amplifier, 12 NTSC video signal V
video input terminal, 13 ... NTSC video signal processing circuit,
14 ... recording amplifier, 15, 16 ... magnetic head for recording / reproducing audio signal, high definition video signal, 17, 18 ... NTS
C video signal recording / reproducing magnetic head, 19 ... magnetic tape,
Reference numeral 20 denotes a sub audio signal L'ch input terminal, 21 denotes a sub audio signal R'ch input terminal, 22 denotes a Hi-Fi audio signal processing circuit, 23 denotes a bias oscillation circuit, and 24 denotes an addition circuit.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-119514 (JP, A) JP-A-63-171402 (JP, A) JP-A-59-218606 (JP, A) JP-A-61-1986 145701 (JP, A) JP-A-2-132601 (JP, A) JP-A-3-24897 (JP, A) JP-A-3-156701 (JP, A) JP-A-4-85705 (JP, A) Hira 4-86178 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B 5/52-5/53 G11B 5/02

Claims (1)

(57) [Claims] 1. A method for recording information on a magnetic tape,
Rotary head type magnetic recording / reproducing device for reproducing information from tape
A first video information and a first video information associated with the first video information.
A first mode for recording or reproducing the audio information, a second video information, and a second mode associated with the second video information.
Record or reproduce the audio information of the first mode and
And a switchable second mode, in which the first video information is recorded in the first mode.
Or regenerate, the absolute value of the azimuth angle forms the first angle.
One magnetic head and the first audio information in the first mode.
Or play and the second mode in the second mode.
Recording or reproducing video information and the second audio information
And the absolute value of the azimuth angle is different from the first angle.
A second magnetic head which forms a second angle, re-rotary head type magnetic recording and characterized in that it comprises a
Raw equipment.