JPH04219613A - Rotary head type magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To offer a rotary head type magnetic recording and reproducing system recording or regenerating a high-definition television signal, a current television signal and a sound signal on the same recording medium. CONSTITUTION:Both the azimuth angles and the truck widths between heads 15, 16 recording the high-definition television signal and heads 15, 16 recording the sound signal of the current television signal with a deep layer recording system are the same and those 2 kinds of heads are served also for both uses. On the other hand, the present television signal is recorded with exclusive heads 17, 18 and the sound signal of the high-definition television signal is superposed with the frequency and is recorded on the high-definition television signal recording heads 15, 16 together with the television signal. The recording and reproduction of the image and sound signal of the high-definition television and NTSC, etc.; the recording and regeneration of the image signal and sound signal based on the current television system can realize at the minimum head numbers. Also accompanying with the decrease of the head numbers on the cylinder, the jitter of an impact property is also reduced and the improvement of the image quality of the reproduced picture is realized.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a rotary head type magnetic recording and reproducing device, and in particular, it records or reproduces high-definition television signals, current television signals, and audio signals accompanying or related to these on the same recording medium. related to the system.

0002

2. Description of the Related Art In recent years, high-definition televisions with more than twice the number of horizontal scanning lines than conventional televisions have been attracting attention as next-generation television systems. In Japan, experimental broadcasting is being conducted based on the high-definition system, which has 1125 scanning lines and was developed mainly by the Japan Broadcasting Corporation. For the full-scale spread of high-definition, not only receivers for receiving high-definition but also home-use VTRs for recording broadcasts are essential. In high-definition broadcasting, digital audio with excellent sound quality is transmitted to match the high-definition image quality. Therefore, high-definition home VTRs compatible with next-generation televisions such as high-definition televisions are required to be capable of digitally recording audio.

Furthermore, as a consumer need, when a high-quality home VTR is introduced into the market, it is desirable that it be compatible with conventional home VTRs, especially VHS system VTRs, which are currently the most popular. It will be done. Compatibility here means that if a high-quality VTR designed according to a certain format is released on the market, this VTR will be
This means that tapes recorded using the HS system can be played back in some form.

Conventionally, as a method for recording digital audio signals, so-called PCM audio signals, in a home VTR, the tape is wound around the cylinder at an angle of 180° or more, as is used for 8mm video, and the PC
An overlap PCM method is known in which M audio signals are recorded in an overlap area of a tape. However, this method cannot be applied to other home VTRs, such as the VHS system.
When applied to TR, a problem arises in that changing the tape winding angle changes the recording pattern on the tape, making it incompatible with conventional methods.

As a means to solve the above problem, as described in Japanese Patent Laid-Open No. 171402/1982, a PCM audio signal is modulated by a carrier having a lower frequency than the video signal, and the audio signal after the modulation is A method is known in which the audio signal is recorded below the video signal in the thickness direction of the tape using a dedicated audio head that is separate from the video signal head and has a different azimuth angle. According to such a so-called deep recording method, it is possible to record PCM audio without changing the conventional recording pattern of video signals.

[0006]

However, the deep recording method described above has a problem in that a dedicated head is required for recording and reproducing audio signals. In the above-mentioned home high-definition VTR, in order to maintain compatibility with, for example, a VHS system VTR, the heads that should be mounted on the cylinder are the video head for recording and reproducing high-definition television signals and the audio head. As a result of the large number of heads, video heads and audio heads for recording and reproducing the current television signals, this becomes a cause of cost increase, which poses a particularly serious problem. Furthermore, as the number of heads on a cylinder increases, impact errors due to tape striking of the heads increase, which appears as distortion on the playback screen, which significantly degrades image quality, especially when recording and playing back high-definition television signals that require high image quality. The problem arises of

In view of the problems of the prior art, the present invention aims to realize recording and playback of digital audio in a high-definition VTR for home or semi-commercial use, and to
We present a technical means to reduce the number of heads on a cylinder, which had to be increased in order to ensure compatibility with TR, thereby minimizing cost increases and further reducing the above-mentioned deterioration in image quality due to an increase in the number of heads. The purpose is to provide a VTR with improved performance.

[0008]

[Means for Solving the Problems] In order to achieve the above object, we have developed both a head for recording high-definition television signals and a head for digitally recording the audio signals of current televisions using a deep recording method. The azimuth angle and track width are made the same, and these two types of heads are used in common. On the other hand, an audio signal accompanying or related to a high-definition television signal is frequency-multiplexed with the high-definition television signal and then recorded together with the television signal by a high-definition television signal recording head.

Furthermore, in order to realize a post-recording function for high-definition television audio, in addition to the audio signal that is frequency-multiplexed and recorded on the high-definition television signal, the video signal is time-base compressed, so that the head A dedicated area for audio recording is provided in the track area within 180 degrees in terms of rotational speed, or an extension thereof, and audio signals are digitally recorded in the dedicated area using the same head as the head for recording high-definition television signals. It is something.

0010

[Function] According to the above means, the head for deep recording digital audio signals and the head for high-definition television signals can be used together, ensuring compatibility with, for example, a VHS system VTR, and A dual-mode VTR capable of recording and reproducing high-definition television signals can be realized with a simple configuration of at least four heads.

[0011] Furthermore, at this time, since the number of heads on the cylinder can be reduced by the above-mentioned means, deterioration in image quality due to impact jitter induced by so-called tape beating, which accompanies an increase in the number of heads, is also reduced. becomes possible.

Furthermore, according to the above means, it is possible to provide a recording area exclusively for digital audio, and it is also possible to support an after-recording function for digital audio.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 the next generation high-definition television signal, and an NTSC signal is used as an example of the current television signal.
This figure shows the configuration of a VTR recording system that can record video and audio signals of each signal.

In FIG. 1, reference numerals 1, 2, 3, and 4 are input terminals for high-definition signals, and indicate input terminals for a luminance signal Y, color signals Pb, Pr, and synchronization signal S, respectively. 5 is a high-definition video signal processing circuit; 6 and 7 are input terminals for audio signal left channel L and right channel R, respectively; 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
6 is a magnetic head for recording or reproducing high-definition signals and PCM audio signals; 12 is an input terminal for NTSC signals; 13 is a processing circuit for NTSC signals; 14 is a recording amplifier; 17 and 18 are for recording or reproducing NTSC signals. 19 is a magnetic tape; 20 and 21 are input terminals for the sub audio signal left channel L' and right channel R'; 22 is a Hi-Fi audio signal processing circuit;
3 is a bias oscillation circuit, and 24 is an adder circuit.

FIG. 2 is a diagram showing the arrangement of the magnetic head on the rotating cylinder.

In FIG. 2, 30 is a rotating cylinder, and other parts 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 making an angle of 90 degrees with respect to the cylinder rotation angle.

Referring to FIG. 1, first, the case of recording a high-definition signal will be explained. Luminance signal Y, color signals Pb, Pr, input from input terminals 1, 2, 3, 4, respectively
and the synchronization signal S is the high-definition video signal processing circuit 5.
sent to. FIG. 3 shows an example of the configuration of the high-definition video signal processing circuit 5. In FIG. 3, 51, 52, and 53 are A/D converters for A/D converting the luminance signal Y and color signals Pb and Pr, respectively, and 54 is for converting the above two color signals into line-sequential color signals. 55 is a timing signal generation circuit that generates each timing signal using the synchronization signal S as a time axis reference; 56 is a timing signal generation circuit having a predetermined capacity, and time axis compression multiplexes the line sequential color signal and luminance signal. Processing (Time
Compressed Integration
57 is an FM modulation circuit for FM modulating the video signal (referred to as TCI signal) after the time axis compression multiplexing process. FIG. 4 shows one form of the TCI signal. As shown in FIG. 4, the TCI signal is a video signal in which a negative synchronization signal, a burst signal for detecting time-base errors during playback, a line-sequential color signal, and a luminance signal are multiplexed on the time axis, and is a high-definition signal. This is a signal format that is often used for transmitting and recording high-definition television signals. The video signal processed by the high-definition video signal processing circuit 5 having the above configuration and functions is input to the addition circuit 9.

On the other hand, the audio signal accompanying the high-definition 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 an example of the configuration of a PCM audio signal processing circuit. In FIG. 5, 81 and 82 are A/D converters for A/D converting audio signals input from the left channel input terminal and right channel input terminal, respectively, and 83 is an error correction unit for the input digital signal. A digital signal processing circuit performs processing such as adding a code, and 84 is a four-phase phase modulation circuit (QPSK modulation circuit) for converting the processed signal into a signal that is easy to record on a tape. The audio signal processed by the PCM audio processing circuit having the following is input to the adding circuit 9.

In the adder circuit 9, the analog adder circuit frequency-multiplexes the high-definition signal after FM modulation and the PCM audio signal after four-phase phase modulation. FIG. 6 is a diagram showing the arrangement of video signals and audio signals on the frequency axis after multiplexing. The video signal is FM modulated as described above, and its frequency allocation is determined to be, for example, 20 MHz at the synchronization tip and 28 MHz at the white peak. On the other hand, the carrier frequency of the PCM audio signal after modulation is 2.
5 MHz, and the occupied bandwidth is ±1.3 MHz. With such a frequency arrangement, the interference between video and audio can be reduced to a level that poses no practical problem, thereby allowing the video signal and the PCM audio signal to be recorded with the same head. Next, this addition signal is sent to the recording amplifier 11 via the changeover switch 10. Recording amplifier 1
1 amplifies the input signal to a level suitable for recording, and supplies the recording signal to the magnetic heads 15 and 16.

As mentioned above, the magnetic heads 15 and 16 have azimuth angles of +30° and -30°, respectively. At this time, if the cylinder 20 has a relatively small diameter, for example, the diameter is 62 mm, which is the same as that of a VHS type VTR.
mm, when recording a high-frequency signal like the one above at the normal rotation speed (1800 r/min), the relative speed between the tape and the head is as slow as 5.8 m/sec, so the shortest recording corresponding to the white peak is possible. As the wavelength becomes very short, 0.2 μm, it becomes difficult to obtain a sufficient signal-to-noise ratio. To this end, in this example, the cylinder rotation speed is set to four times the normal rotation speed (7200 r/min), and the relative speed between the tape heads is increased to 23.4 m/sec, thereby shortening the recording wavelength. This prevents wavelength shift and SN deterioration. In the VTR of this embodiment, the wavelength corresponding to the white peak of the video signal is approximately 0.83 μm, which is a sufficiently practical value for recording and reproducing high-definition signals that require a high S/N ratio.

FIG. 7 is a diagram showing a track pattern on a tape when recording a high-definition signal. As the cylinder rotates four times, one field of the video signal is divided into four parts (referred to as segments) using horizontal scanning lines as units, and each segment is recorded on a corresponding track. As a result, one field is distributed and recorded on a total of four tracks. This type of recording method is called a segment recording method, and for example,
1-029283 discloses its detailed technical content. In Figure 7, the first field is recorded in four tracks indicated by 1, 2, 3, and 4, and the second field is recorded in four tracks indicated by 1', 2', 3', and 4'. are recorded distributed over several tracks. Further, + and - in the figure indicate positive and negative head azimuth angles corresponding to the tracks. In the segment recording method, the video signal within one continuous field is distributed and recorded on multiple tracks, so when the head is switched between tracks, temporal discontinuity occurs in the reproduced video signal of one field. There's a problem. To solve this problem, as detailed in the above publication, the input and exit sides of each truck, i.e.,
By providing a blanking period (period in which no video signal is recorded) of approximately 1 to 2 hours at the joint between each segment, and switching heads during this blanking period, it is possible to avoid missing video signals during the recording and playback process. It is possible to prevent any temporal discontinuity from occurring.

As described above, in this embodiment, when recording or reproducing a high-definition signal (high-definition mode), only two heads, the magnetic heads 15 and 16, are used to record or reproduce both the video signal and the PCM audio signal. It is configured to be able to record.

Next, in this embodiment, the case where a current television signal, for example, an NTSC signal, is recorded or reproduced will be explained using FIG. 1 again. The NTSC signal to be recorded on the VTR is input from the NTSC signal input terminal 12 and sent to the NTSC video signal processing circuit 13. N.T.
The SC signal processing circuit 13 separates the luminance signal and chrominance signal contained in the input NTSC signal, and subjects the luminance signal to FM modulation and the chrominance signal to frequency conversion processing to the lower frequency side. FIG. 8 is a diagram showing the frequency arrangement of each signal in the S-VHS system, and (a) schematically shows the spectrum of the luminance signal after FM modulation and the 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 this signal is sent to the NTSC video signal recording/reproducing head 17,
18 and recorded on magnetic tape 19. head 1
The azimuth angles of heads 7 and 18 are +6° and -6°, respectively, which are different from the azimuth angles of ±30° of the high-definition heads 15 and 16 described above.

Next, audio signals accompanying or related to the NTSC signal are recorded as follows based on the PCM audio recording method of the S-VHS standard and the FM audio recording method, the so-called Hi-Fi audio recording method. That is, the main audio signals L and R of the two left and right channels inputted from the analog audio input terminals 6 and 7 are first input to the PCM audio signal processing circuit 8.
is input. As shown in Figure 5, the PCM audio processing circuit converts the input 2-channel main audio signal into a digital signal using an A/D converter, just as it processes audio signals accompanying high-definition signals. , an error correction code is added to this, and then QPSK modulation (four-phase phase modulation) is performed. The QPSK signal thus obtained is sent to the adder circuit 24. On the other hand, analog audio input terminal 20,
Sub-audio signal L' of left and right channels inputted from 21
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 1.3MHz and 1.
．． FM modulation is performed using 7MHz as the carrier center frequency. The FM audio signal thus obtained is sent to the adder circuit 24. The adder circuit 24 further includes a bias oscillation circuit 23.
An 11 MHz bias signal generated at is input. This bias signal is applied to the PCM audio signal and Hi
- This is for recording both signals of the Hi-Fi audio signal using the bias recording method, suppressing interference between the PCM audio signal and the Hi-Fi audio signal during the recording process, and producing a reproduced signal with a good S/N ratio. It is effective to obtain. As a result,
Three signals, a PCM audio signal, an FM audio signal, and a bias signal, are input to the adder circuit 24, and these three signals are frequency-multiplexed. FIG. 8(b) shows the frequency arrangement of each signal after frequency multiplexing. The signal output from the adder circuit 24 is sent to the recording amplifier 11 via ten changeover switches. In the recording amplifier 11, the input signal is amplified to a predetermined level suitable for recording, and 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, diagonal rectangular parts drawn with solid lines are tracks where video signals are recorded, and parts drawn with dotted lines are tracks where audio signals are 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 angle of the video signal heads 17 and 18 is ±6°, the azimuth angle of the audio signal heads 15 and 16 is ±30°, and the audio head is one track relative to the video head. The signal is arranged so as to record the signal in advance by a minute. FIG. 10 is a diagram schematically showing the magnetization state of the magnetic layer in this deep recording method. Figure 10
As shown in , it can be seen that the PCM audio signal and the Hi-Fi audio signal are recorded on the deeper side in the thickness direction of the magnetic layer of the magnetic tape, and the video signal is recorded on the surface side.

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

In FIG. 11, parts whose numbers match those shown in FIG. 1 indicate the same parts.

Assume now that a tape or cassette on which a high-definition signal is recorded is inserted into this VTR. At this time, the tape or cassette inserted into the VTR can be identified by means such as detecting the spectrum of the signal recorded on the tape, identifying the shape of the cassette half, or detecting the identification hole provided in the cassette half. The playback system is set to high-definition playback mode. The reproduction mode detection means 100 detects the reproduction mode. In high-definition playback mode, the number of rotations of the cylinder is four times that of 720.
The speed is set at 0 r/min, and reproduction is performed using the magnetic heads 15 and 16. The high-definition signal reproduced from the magnetic tape 19 by the magnetic heads 15 and 16 is amplified to a predetermined level by a reproduction preamplifier 110 and sent to a changeover switch 111. Changeover switch 1
11 is switched according to the detection result of the reproduction mode detection means 100, and the switch is turned upward in the high-definition mode. Changeover switch 111
The reproduced signal is sent to a separation circuit 112, where it is separated into a high-definition signal recorded on the high frequency side and a PCM audio signal recorded on the low frequency side. Of these, the high-definition signal is sent to a high-definition video signal reproduction processing circuit 114, while the PCM audio signal is sent to a PCM audio signal reproduction processing circuit 115. In the above two signal processing circuits, predetermined processing is applied to the input signals respectively, and the output terminal 117 of the high-definition video signal reproduction processing circuit 114 outputs the luminance signal Y, and the terminals 118 and 119 output the chrominance signal Pb. , Pr, and a synchronizing signal S is output from the terminal 120. In addition, the PCM audio signal reproduction processing circuit 115
A left channel audio signal L and a right channel audio signal R are output from output terminals 121 and 122, respectively.

Next, the operation when a tape (cassette) on which an NTSC signal is recorded according to the S-VHS system is inserted into this VTR will be described. In this case, first, the reproduction mode detection means 100 identifies the type of signal recorded on the tape and detects that it is an NTSC signal. The cylinder rotation speed is the usual 18
00 r/min, the magnetic heads 15 and 16 reproduce PCM audio signals and Hi-Fi audio signals recorded in 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 selector switch 111 is in the downward position, and the reproduced signal is sent to the separation circuit 113. The separation circuit 113 separates the PCM audio signal and Hi-Fi audio signal from the reproduced signal, and sends them to the PCM audio signal reproduction processing circuit 115,
The signal is sent to the Hi-Fi audio signal processing circuit 116. These two processing circuits each perform predetermined processing on the input signal, and the PCM audio signal reproduction processing circuit 11
5, main audio signals L and R are output from main audio signal output terminals 121 and 122. Additionally, the Hi-Fi audio signal reproduction processing circuit 116 outputs sub audio signals L' and R.
' is output from the sub-audio signal output terminals 123 and 124. On the other hand, the NTSC video signal is reproduced by the magnetic heads 17 and 18, and after being amplified to a predetermined level by the reproduction preamplifier 130, the NTSC video signal reproduction processing circuit 13
1, the signal is subjected to predetermined processing and output to the video signal output terminal 132.

As described above, in the VTR of this embodiment, the operating mode of the VTR is determined during both recording and playback according to the type of video signal input to the VTR or the type of video signal recorded on the magnetic tape. It becomes possible to record and reproduce video and audio signals for both high-definition signals and current television signals.

FIG. 12 is a diagram showing the configuration of a recording system in another embodiment of the present invention. In FIG. 12, parts whose part numbers match 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 once 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 signal output from the 2-input changeover switch 103
is input and time-axis multiplexed.

FIG. 13 is a waveform diagram schematically showing the above-described time axis compression and time axis multiplexing processing. Figure 13(a)
The portion indicated as one track video signal indicates the time length of the TCI signal to be recorded within one track, and corresponds to 180 degrees in terms of cylinder rotation angle. The above TCI signal is processed by the time axis compression circuit 101 (b) in FIG.
), the time axis is compressed at a compression rate of 5/6. Therefore, the length of the compressed TCI signal corresponds to 150 degrees in 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 created in a portion of one track corresponding to a cylinder rotation angle of 30 degrees. The PCM audio signal output from the time axis compression circuit 102 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. Note that the modulation method for the PCM audio signal at this time is not limited to the four-phase modulation method shown in Fig. 5, but can also be used in consideration of the data transmission rate after compression, the frequency and wavelength of the signal recorded on the tape, etc. The most suitable digital modulation method is then selected. FIG. 13(c) shows a recorded signal after time-axis multiplexing of the time-axis compressed TCI signal and PCM audio signal. In FIG. 12, this time-axis multiplexed signal is output from a changeover switch 103 and sent to a recording amplifier 11 via a changeover switch 10. The other parts in FIG. 12 operate exactly as in FIG.

FIG. 14 is a diagram showing a recording pattern on a tape of a high-definition signal and an audio signal accompanying or related thereto in the embodiment described above. Figure 1
4, each track is divided into two parts, and the head input side is a recording area for video signals, while the diagonally shaded part on the head output side is an area for recording audio signals. The numbers shown in the track indicate the segment numbers in one field, and 1, 2, 3, 4 indicate each segment in the first field, 1', 2', 3'
, 4' indicate each segment in the second field. Further, (+) and (-) written inside a track indicate the azimuth angle of the head corresponding to that track. If video signals and audio signals are recorded using the area division method shown in FIG. 14, it is possible to support a so-called post-recording function in which only audio signals are later recorded on a recorded tape.

FIG. 15 is a diagram showing another embodiment for realizing the above-mentioned post-recording function, in which the time-base compression ratio of the time-base compression circuit 101 in FIG. No, time axis compression circuit 102
The figure shows a recording pattern on the 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 180 degrees in cylinder rotation angle, and the PCM audio recording area indicated by diagonal lines corresponds to 20 degrees. This PCM audio recording area can be secured by using the linear audio recording area in the VHS system VTR as shown in the figure, and it is possible to realize PCM audio recording using the so-called overlap system. Furthermore, according to this method, there is no need to change the lead angle of the cylinder in the VHS system VTR, and therefore, overlap recording can be realized while maintaining compatibility with the VHS system VTR.

As explained above, in this embodiment, when recording and reproducing a high-definition video signal and an accompanying PCM audio signal, magnetic heads 15 and 16 with an azimuth angle of ±30° are used, and the NTSC When recording and reproducing video signals and accompanying PCM audio signals and Hi-Fi audio signals, according to the S-VHS VTR standard, a magnetic head with an azimuth angle of ±6° is required for video signals. 17 and 18, and for audio signals, magnetic heads 15 and 1 having an azimuth angle of ±30° are used.
6. With this configuration, recording and playback of high-definition signals and NTS
For recording and reproducing C-signal audio signals using the deep recording method,
It becomes possible to use the same head with a common azimuth angle and track width. As a result, four magnetic heads 1
With an extremely simple configuration of 5, 16, 17, and 18,
It is possible to record and reproduce video and audio signals in two modes: high-definition and NTSC.

[0037]

As explained above, according to the present invention, a rotary head type video signal recording and reproducing apparatus is capable of recording and reproducing high-definition television signals and audio signals accompanying or related thereto, and is capable of recording and reproducing high-definition television signals and audio signals accompanying or related to the same, as well as for recording and reproducing high-definition television signals and audio signals that are compatible with current televisions such as NTSC. Recording and playback of video signals and accompanying or related audio signals based on the
The same mechanism makes it possible to achieve this with a minimum number of heads. Furthermore, as the number of heads on the cylinder is reduced, impact jitter induced by so-called tape beating can also be reduced, resulting in the effect of improving the quality of reproduced images.

[Brief explanation of the drawing]

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 the form of a TCI signal.

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

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

FIG. 7 is a diagram showing a track pattern on a tape during high-definition recording.

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

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

FIG. 10 is a cross-sectional view of the tape magnetic layer.

FIG. 11 is a configuration diagram of a playback system showing an 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 showing time-axis multiplexing processing of a video signal and an audio signal.

FIG. 14 is a diagram showing a track pattern on a tape when recording a high-definition signal in another embodiment of the present invention.

FIG. 15 is a diagram showing a track pattern on a tape when recording a high-definition signal 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
ideo input terminal, 13...NTSC video signal processing circuit,
14...Recording amplifier, 15, 16...Magnetic head for recording and reproducing audio signals and high-definition video signals, 17, 18...NTS
C magnetic head for recording and reproducing video signals, 19...magnetic tape,
20...Sub audio signal L'ch input terminal, 21...Sub audio signal R'ch input terminal, 22...Hi-Fi audio signal processing circuit, 23...Bias oscillation circuit, 24...Addition circuit.

Claims (6)

[Claims] Claim 1: High-definition television signals, current television signals, and audio signals accompanying or related to these video signals,
In a device that records or plays back on a magnetic tape using a rotating head system, a head (
15, 16) and a head (17, 18) for recording or reproducing a current television signal, when recording or reproducing an audio signal accompanying or related to the current television signal, the high-definition television signal can be used. A rotating head type magnetic recording/reproducing device characterized by using heads (15, 16) for recording or reproducing. 2. The rotary head type magnetic recording and reproducing apparatus according to claim 1, wherein the high-definition television signal and the audio signal accompanying or related thereto are frequency-multiplexed and then recorded by the same head. . 3. The audio signal accompanying or related to the high-definition television signal is a digital audio signal, and the digital audio signal is modulated using a four-phase phase modulation method when being recorded on a magnetic tape. The rotary head type magnetic recording/reproducing device according to claim 2. 4. When recording the high-definition television signal and an audio signal accompanying or related thereto, one track is divided into two or more parts, and the high-definition television signal and the digitized audio signal are recorded. 2. The rotary head type magnetic recording and reproducing apparatus according to claim 1, wherein said audio signals are recorded in different areas on the tape by the same head. 5. The audio signal accompanying or related to the current television signal is a frequency modulated analog audio signal and/or a quadrature phase modulated digital audio signal, and the audio signal is recorded using a deep recording method. 2. The rotary head type magnetic recording/reproducing apparatus according to claim 1, wherein recording is performed in a deep part of a magnetic layer of a magnetic tape. 6. A head for recording or reproducing the high-definition television signal and audio signals accompanying or related thereto;
Claim 1, wherein the azimuth angle of the heads (15, 16) is ±30°, and the azimuth angle of the heads (17, 18) for recording or reproducing current television signals is ±6°.
6. The rotary head type magnetic recording and reproducing device according to 2, 3, 4 or 5.