JPH05130547A - Multiple video signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To provide the VTR compatible with home VTRs and corresponding to the diversification of the input source by the recording and reproducing video signals of multiple channels with one VTR and reproducing the prescribed video signal from the tape recorded using the conventional VTR. CONSTITUTION:A plurality of pairs of rotary heads with the track width narrower than 1/2 of a recording track pitch and with the same azimuth relation are provided. Multiple video signals are processed by multiple recording processing means 7 and 8, a control signal in synchronism with the vertical synchronizing signal of either video signal is recorded on a control track, and the recording system is constructed to record by multiple rotary head pairs. The reproduction system is constructed to select a signal to be reproduced from the rotary head pair and provide the required signal output in a reproduction processing means 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plural video signal recording / reproducing apparatus capable of simultaneously recording plural video signals on the same tape and reproducing desired signals.

[0002]

2. Description of the Related Art In recent years, household VTRs have become extremely popular. However, when recording a television broadcast, it is not possible to record video signals of multiple channels at the same time with one VT.
It was impossible with R. This is due to recent BS broadcasts and C
The development of ATV makes it more inconvenient.

Conventionally, there is a method called field skip as a method of recording a plurality of video signals with one VTR. For example, there is JP-A-59-117383. The structure is shown in FIG. The video signals applied to the input terminals 21 and 22 are synchronized by the delay circuit 25 and the control circuit 26, and the switching circuit 24 obtains a composite signal in which the input signals are rearranged for each field, and the rotary head is passed through the recording circuit 29. Recorded by 30. During reproduction, a signal obtained by delaying the composite signal reproduced by the reproducing circuit 31 is produced by the delay circuit 32 and each video signal selected by the switching circuit 33 is obtained. However, such field skip recording has a drawback that the video information is intermittently reproduced because each video signal is recorded in each field, and the reproduced image becomes unnatural. There is a problem that the vertical resolution of the reproduced image is deteriorated even if the line skipping is performed for each line.

Further, as a method of recording all information instead of field skip, there is JP-A-63-280589 which records a plurality of video signals by using a plurality of head pairs. This method shows the tape pattern in FIG.
The R channel signal is recorded by a rotary head pair having an azimuth angle of ± θ, and the L channel signal is recorded by a rotary head pair having different azimuth angles of ± φ. In this case, although self-recording / reproduction is possible, when a tape recorded by this VTR is reproduced by a conventional VTR, only one channel can be reproduced, and there is a big problem in compatibility.

[0005]

The problem to be solved by the present invention is that a function which cannot be achieved by a conventional VTR, that is, a video signal of a plurality of channels is recorded and reproduced by one VTR, and is recorded by the VTR according to the present invention. For the purpose of providing a VTR capable of reproducing a desired video signal even with a conventional VTR, maintaining compatibility with many popular VTRs for home use and diversifying input sources. There is.

[0006]

In order to achieve the above object, the present invention has a plurality of recording processing means for converting a plurality of video signals into recordable signals, and a track width narrower than 1/2 of the recording track pitch. A first rotary head pair having a gap azimuth angle in an inverse relationship with each other and a relative position of 180 degrees, a second rotary head pair having the same azimuth relationship with the first rotary head pair and a relative position of 180 degrees, and A reproduction system in which a recording system is configured to include a means for recording a control signal synchronized with any of the vertical synchronizing signals of a plurality of video signals on a control track, and a reproduction signal obtained from a plurality of rotary head pairs is restored to a video signal. A reproducing system is configured to include a processing means and a servo means for reproducing a control signal recorded on a control track to control the rotary head pair and tape running. Is shall.

[0007]

According to the present invention, with the above-described structure, a plurality of video signals are simultaneously recorded by a plurality of rotary head pairs by dividing the track pitch of a conventional VTR into a plurality of tracks.
The azimuth angle of multiple rotary head pairs is converted to the conventional VTR for consumer use.
It is set the same as the above, and since the information synchronized with the vertical sync signal of any video signal is recorded on the control track, it is possible to simultaneously or selectively reproduce the video signals recorded in a plurality of, Moreover, if a tape recorded according to the present invention is applied to a conventional VTR, a plurality of video signals can be selectively reproduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. Reference numeral 1 is an input terminal of channel 1, 2 is a recording processing circuit, 3 and 4 are first rotary head pairs, and 5 is channel 2.
Input terminal, 8 is a recording processing circuit, 9 and 10 are second rotary head pairs, 16 is a control signal processing circuit, 17 is a recording servo system, 18 is a control signal recording / reproducing head, and these constitute a recording system. There is. The reproducing system selects and amplifies the signals of the rotary head pairs 3 and 4, a reproducing amplifier 14 that selects and amplifies the signals of the rotary head pairs 9 and 10, and a switching circuit 15 that switches the outputs of the reproducing amplifiers 11 and 14. It is composed of a reproduction processing circuit 12, a video output terminal 13, a control signal reproduction amplifier 19, and a reproduction servo system 20.

The relationship and operation of each component of the VTR having the above components will be described. Now, the video signal has two channels and is applied to the input terminals 1 and 5, respectively. 1
The video signal of the first channel inputted to the recording processing circuit 2
Then, the necessary processing for recording is performed. This is exactly the same as the recording process of the conventional home VTR, in which the luminance signal is subjected to processing such as emphasis and FM modulation, and the color signal is converted into a low frequency. The signal of the channel 1 that has passed through the recording processing circuit 2 is supplied to the rotary heads 3 and 4 having an azimuth angle of + θ and −θ and a track width narrower than ½ of the track pitch, and recorded on the tape like a conventional VTR. To be done. On the other hand, the signal of channel 2 is subjected to processing necessary for recording in the recording processing circuit 8. This processing is exactly the same as the recording processing circuit 2. The signal of the channel 2 that has passed through the recording processing circuit 8 is supplied to the rotary heads 9 and 10 where the azimuth angles are + θ and −θ and the track width is narrower than ½ of the track pitch to be recorded. When recording a video signal with a VTR,
It is necessary to record the control signal synchronized with the video signal on the control track on the tape. In the case of this embodiment, the control signal synchronized with the video signal of channel 2 is recorded on the control track on the tape by the control signal recording processing circuit 16 and the fixed control head 18. This control signal is used as a control signal for the reproduction servo system for controlling the cylinder and capstan during reproduction. This control signal is information synchronized with the vertical synchronizing signal of the input video signal, and the switching timing of the rotary head pairs 9 and 10 is controlled so as to come within the vertical blanking period of the video signal, and the screen switching by the head switching unit is disturbed. Is designed so that you cannot see. In this embodiment, the channel 2 video signal maintains this relationship, but the channel 1 video signal is usually not synchronized with the channel 2 video signal, and the vertical sync signal and the control head 18 are used for recording. Since the rotary heads 3 and 4 are switched outside the vertical blanking portion because they are not in a synchronous relationship with the control signal, a seam of images due to the head switching appears in the reproduced screen. However, recent V
In the TR technique, the splicing accuracy of the head switching unit is improved, and the image quality is almost acceptable, so that the image signal of channel 1 is also sufficiently acceptable in practical use. Of course, it is also possible to take the control signal from the signal of channel 1, in which case the video signal of channel 1 is reproduced completely seamlessly and the video signal of channel 2 is reproduced with a small amount of seam left on the screen.

The tracks on the tape recorded by the heads 3, 4, 9 and 10 are designed so as not to overlap, which will be described later.

In the reproducing system, the signal of channel 1 reproduced by the heads 3 and 4 is amplified and selected by the reproducing amplifier 11, and a continuous signal is output. Similarly, the signal of channel 2 reproduced from the heads 9 and 10 reaches the switching circuit 15 via the reproduction amplifier 14. The switching circuit 15 selects either the signal of channel 1 or the signal of channel 2 according to a user's command.
A reproduction processing circuit 12 performs reproduction processing (de-emphasis, FM demodulation, color frequency conversion, etc.) similar to that of a conventional VTR on the selected one of the signals, and outputs the reproduced signal to the output terminal 13. As described above, in the embodiment of FIG. 1, one VTR can simultaneously record the video signals of two channels, and at the time of reproduction, the signal of one channel can be selected and reproduced.

Next, the recording tracks on the tape of the rotary heads 3, 4, 9 and 10 will be described.

The embodiment of FIG. 1 records video signals of two channels, and in this case, the servo system of the VTR is set to the standard mode. For example, in the VHS-VTR, the track pitch in the standard mode is 58 μm, and it is set as the standard mode in the conventional VTR with the tape feeding speed of 3.3 cm. The track width of the rotary heads 3, 4, 9 and 10 is set to about 25 μm, which is narrower than ½ of the track pitch. Further, the azimuth angle is set to ± θ, which is the same as the conventional VTR, as described above. Then, the track pattern shown in FIG. 2 can be formed by setting the mounting angle and mounting step on the cylinder of the rotary head. In FIG. 2, Tp represents the track pitch in the standard mode. The video signals of channels 1 and 2 are track L within one track pitch by the heads 3 and 10 with a track width of about 1/2 and an azimuth angle of ± θ.
It is recorded as 1, R2, and then the azimuth angle is measured by heads 4 and 9.

[0014]

[Outer 1]

At θ, the signals of both channels are tracks R1 and L.
It is recorded as 2. The head number is shown below the track so that the relationship between the track pattern and the recording / reproducing head can be understood. In this case, the heads 3 and 4 are mounted on the cylinder at a position of 180 ° C.
It goes without saying that both 10 and 10 are mounted at a position of 180 ° on the cylinder.

When reproducing a tape recorded with such a track pattern, the servo system is also set to the standard mode, and the channel 1 signal is reproduced sequentially by the rotary heads 3 and 4 from the L1 and R1 track signals. Channel 2
Signal of L2 and R2 tracks are sequentially reproduced by the rotary heads 9 and 10. Therefore, the signal of the first or second channel can be reproduced by selecting the reproduction signal of either rotary head pair. The control signal described above is recorded on a control track other than the video track, as in the conventional VTR.

FIG. 3 shows the track pattern of FIG. 2 in more detail and shows the state of reproduction by a conventional VTR. The track pitch Tp in the standard mode has a head width (25 mm) which is narrower than 1/2 of the track pitch (58 μm).
CH. 1 and CH. 2 video signals of No. 2 are recorded at the same azimuth angle, and CH. 1 tracks L1, R1 and CH. In this case, the two tracks L2 and R2 have a guard band 6 of 8 μm to prevent crosstalk between the same azimuths. When the tape recorded in this way is reproduced by the self-device, since the recording head and the reproducing head are the same, it is possible to easily reproduce the signals of two channels.

Next, how the conventional VTR reproduces the tape having the track pattern thus recorded will be described. Conventional VTR has a standard mode head width of 45
It is set to ~ 50μm and is 1 / the track pitch.
It is wider than 2 and narrower than Tp. This head can move the head position with respect to the track pitch by adjusting the tracking shifter during reproduction. CH. In the 1-playback state, a head having a width of 49 μm was used for CH. The signal tracks R1 and L1 of No. 1 are located at the tracking position. For example, the head 21 picks up the signal of the R1 track with an azimuth angle of −θ, but does not pick up the signal of the L2 track with an azimuth angle of + θ due to azimuth loss. Therefore C
H. Can play 1 R1 track. The pair of heads 22 reproduces the L1 track and does not pick up the signal of the R2 track because the azimuth angle is + θ. Therefore C
The H1 and L1 tracks are reproduced. In this way, CH. If the reproducing head is provided at the position of one reproduction, even if the head is wider than the recorded track width, the CH. One signal can be selectively reproduced. On the contrary, the tracking head is used for CH. Head 23 is L when it comes to the position of 2 reproduction
The head 24 reproduces two tracks, the R2 track, and the signals of the adjacent other tracks L1 and R1 are not picked up. Therefore, CH. Two signals can be reproduced. As described above, if the recording tape pattern is set as in this embodiment, 2-channel selective reproduction by the conventional VTR is possible and compatibility with the conventional VTR can be secured.

In the embodiment, it is easy to construct one of the two rotary head pairs so that it also doubles as a long-time mode head. In the case of VHS-VTR,
The track width of the long-time mode head is 30 to 20 μm, which meets the above conditions. In this way, only one rotary head pair needs to be added as a 2-channel recording VTR, which is economical.

FIG. 4 shows an embodiment of a VTR including a two-channel recording / reproducing function, which is a conventional home-use VT.
It is configured to be more compatible with R. The difference from FIG. 1 is the changeover switches 45, 46, 4
7 and 48 are provided, in addition to the 2-channel recording mode, conventional V
The TR has the standard recording / reproducing mode (SP) which is the recording / reproducing mode and the long-time recording / reproducing mode (EP), and maintains the complete compatibility and the reproducing amplifiers 11 and 14.
Is connected to the reproduction processing circuits 41 and 42 and subjected to reproduction processing to output the video signals of channel 1 and channel 2 at the same time. The latter requires two reproduction processing circuits, but it can realize various characteristic functions such as supplying different reproduction signals to different TV monitors and outputting signals of other channels to a small screen in one screen.

In the embodiment of FIG. 4, the switches 45,46
Is connected to the 2CH side, the CH1 input is recorded by the heads 3 and 4 via the recording processing circuit 2, and CH. The input of 2 is recorded by the heads 9 and 10 via the recording processing circuit 8. At the same time, these are recorded on the tape in such a manner that the track pitch in the standard mode is divided into two as described with reference to FIG. Therefore, as described above, the heads 9, 10 and 13, 14 having a track width of about 25 μm are used. When the switches 45 and 46 are connected to the EP side, the VTR is in the long time mode and the CH. The video input of 1 is supplied to the heads 3 and 4 via the recording processing circuit 2, and E
It is recorded at the track pitch of P mode. Here, the rotary heads 3 and 4 are commonly used in the 2-channel recording / reproducing mode and the long time recording / reproducing mode, and the track width 25
Around μm satisfies this condition. When the switches 45 and 46 are connected to the SP side, CH. The image input No. 1 is supplied to the heads 43 and 44 through the recording processing circuit 2 and recorded on the tape at the standard mode track pitch. Heads 43 and 4
The track width of 4 is 45 to 50 μm. These E
In the P and SP modes, CH. The input of 2 is connected so as not to supply to any head. In the reproduction state, the switches 47 and 48 select the 2CH reproduction mode, the EP reproduction mode, and the SP reproduction mode.
It is preferable that these switches are automatically switched from the recorded tape control signal and video signal information. As described above, the present embodiment has the same standard recording / reproducing mode and long-time recording / reproducing mode as the conventional VTR.
Reproduction of tape recorded in R, SP and E of this VTR
Playback of a tape recorded in P mode on a conventional VTR can be performed without any trouble and compatibility can be maintained. Further, since it has a two-channel recording mode, simultaneous two-channel signal recording / reproduction, which was not possible with the conventional VTR, can be performed, and the tape recorded in this mode can be viewed with the conventional VTR.

As described above, according to the plural video signal recording / reproducing apparatus of the embodiment of the present invention, since the second channel is recorded between the recording tracks of the first channel, the plural tapes are recorded on the same tape. The above-mentioned signals can be selectively or simultaneously reproduced, and the control signal is configured to record in synchronization with either one of the two signals. Therefore, even in another VTR, each channel signal of the recording tape is recorded. Can be selectively played. Further, if the standard mode, the long time mode and the multi-channel recording mode are equipped in one VTR, more complete compatibility can be achieved.

[0023]

As is apparent from the above-described embodiments, according to the present invention, it is possible to simultaneously record / reproduce on a plurality of channels with a VTR which has been capable of recording a video signal on one channel in the related art. Therefore, for example, a video signal obtained from the BS tuner can be recorded in the first channel, and a video signal obtained from the VHF tuner can be recorded in the second channel, and even programs in which the broadcasting hours overlap are simultaneously recorded. Therefore, it is possible to provide a plural video signal recording / reproducing apparatus having a great effect that a reproduced signal can be selected and viewed later and the opportunity loss of listening to a program can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram of a plural video signal recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a relationship between a tape recording pattern and a head used in the apparatus.

FIG. 3 is a schematic diagram showing the details of the tape recording pattern and the positional relationship of heads when reproducing with a conventional VTR.

FIG. 4 is a block diagram showing a second embodiment of the present invention.

FIG. 5 is a block diagram showing the configuration of a conventional field-skipping multi-channel recording system.

FIG. 6 is a tape recording pattern recorded by another conventional multi-channel recording method.

[Explanation of symbols]

 2,8 recording processing circuit 3,4 rotary head pair 9,10 rotary head pair 11,14 reproduction amplifier 12,41,42 reproduction processing circuit 16 control signal recording processing circuit 17 recording servo system 18 control signal recording / reproducing head 19 control signal Reproducing amplifier 20 Reproducing servo system 6 Guard band 21,22,23,24 Rotary head 43,44 Rotary head pair 45,46 Recording system changeover switch 47,48 Reproduction system changeover switch

Claims (2)

[Claims] 1. A plurality of recording processing means for converting a plurality of video signals into recordable signals, a track width having a track width narrower than 1/2 of a recording track pitch, gap azimuth angles being in an inverse relationship to each other, and a relative position being 180 degrees. A first rotary head pair, a second rotary head pair having a relative position of 180 degrees in the same azimuth relationship as the first rotary head pair, and a vertical synchronization signal of any one of the plurality of video signals. And a control signal recorded on the control track, which constitutes a recording system including means for recording the control signal on the control track, and which reproduces the reproduction signal obtained from the plurality of rotary head pairs into a video signal. A plurality of video signal recordings, which comprises a reproducing system including a pair of rotary heads and servo means for controlling tape running. Raw devices. 2. A mode for recording a plurality of video signals at the same time, a standard recording mode for recording a single video signal, and a long-time recording mode, and selecting them at the time of recording. The multiple video signal recording / reproducing apparatus described.