JPH0321179A - Vcr device - Google Patents

Abstract

PURPOSE:To reproduce one program from a video tape on which different signals are simultaneously recorded by allowing the 1st and 2nd reproduced video signals to pass a delay circuit and a 2nd selection circuit. CONSTITUTION:The selection circuit 32 selects a combined signal for one frame and selects also the 1st reproduced signal from a delay signal to synthesize a signal for one frame. In the case of recording/reproducing one program, a tuner 34 out of two and a CHI video head 1 out of two are used.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a two-head helical VTR device.

[Prior Art] Conventionally, this type of VTR device has been equipped with one tuner, and has recorded programs selected by the tuner and transmitted by the station.

Next, a method for recording video signals using a conventional VTR device will be described with reference to the drawings. FIG. 3 is a functional block diagram of a conventional VTR device, and FIG. 4 is a tape pattern diagram of a videotape. In FIG. 3, an NTSC signal output from a tuner (not shown) is input to a converter/color component low-pass converter 9. As shown in FIG. This converter/color component low-frequency converter 9
In the NTSC signal, the luminance signal is FM modulated, and the color signal is low frequency converted. The combined signal output from the converter/color component low-pass converter 9 is sent to the CHI video head 1 and the CH2 video head 2 via the recording amplifier 10. Then, the CHI video head 1 and the CH2 video head 2 alternately divide the video signal of the composite signal into lengths of one field and record them on the video tape.

If it falls, in FIG. 4, CHI video head 1
transmits one field worth of video signal to CH of videotape 21.
Record on I-Video 1 rack 24. Then, the CH2 video head 2 transmits the video signal for the next 1 fill F to the CH2 video head 2.
It is recorded on the CH2 video 1 rack 25 next to the I video track 24.

In the next frame, CH1 video head 1 is
H1 video track 26, CH2 video head 2
records one field worth of video signals on each CH2 video track 27. In this way, the CH1 video head 1 and the CH2 video head 2 alternately record video signals on the video tape 21.

Furthermore, two control 1/roll signals are recorded in the control 1/roll 1 rack 28 in order not to indicate the star l of one frame.

Furthermore, the audio signal is recorded in the audio 1 rack. Here, the LCH of the audio signal is assigned to the CH 1 audio track 22, and the RCH of the audio signal is assigned to the CH 2 audio track 22.
- Recorded on rack 23.

The leftward arrow T in FIG. 4 indicates the running direction of the video tape 21, and the leftward arrow H indicates the rotating direction of the video head.

Next, let's talk about how to play video signals.

The signals reproduced by the CHI video head 1 and the CH2 video head 2 are sent to a CH]-reproduction amplifier 3 and a CH2 reproduction amplifier 4, respectively, and further pass through a channel equalizer 5 and a channel equalizer 6. The signal is sent to switcher 7. In the switcher 7, the signal for one field reproduced by the CHI video head 1 and the signal for one field reproduced by the CH2 video head 2 are connected together via the switching pulse generator 8 to generate a signal for one frame. make. In this way, the combined signals are sent to the demodulation circuit 11. In the demodulation circuit 11, this signal is regenerated into an NTSC signal.

[Problems to be Solved by Hitaku] The conventional VTR device described above has a drawback in that it cannot simultaneously record two different program programs on videotape. As a result, recording of one of the two program programs must be given up. Alternatively, the program must be recorded using two VTR devices.

The purpose of this release is to provide a VTR device which can simultaneously record two program programs and can also reproduce each program program individually.

[A Thousand Steps to Solve the Problem] In order to achieve the goal of "2-1", the VT according to this invention
The R device has the following characteristics.

That is, the present invention provides a VTR device that performs fT of a first video head and a second video head that performs helical scanning, which includes a first tuner that outputs a first video signal, and a first tuner that outputs a second video signal. a second tuner that adjusts the phase of the vertical synchronization signal of the first video signal and the vertical synchronization signal of the second video signal, and outputs a first output signal and a second output signal. a first selection circuit that sends the first output signal to the first video head during recording and sends the second output signal to the second video head during playback; a delay circuit that delays a first reproduced video signal from the first video head and a second reproduced video signal from the second video head; and a delay circuit that delays a first reproduced video signal from the first video head and a second reproduced video signal from the second video head; video signal, selects one of them (hereinafter referred to as a first selection), receives the delayed first playback video signal and the second playback video signal, and selects one of them (hereinafter referred to as a first selection); Similarly, one of them is selected (hereinafter referred to as the second selection), and the playback video signal selected in the first selection and the delayed playback video signal selected in the second selection are combined. and a second selection circuit that alternately outputs.

Here, the first output signal is the first video signal whose phase has been matched in the vertical synchronization circuit. Also,
The second output signal is a second video signal whose phase has been matched in the vertical synchronization circuit.

[Operation] In order to simultaneously record two program programs on one videotape using one VTR device, two video signals received by two tuners may be separately sent to two video heads.

In this invention, a vertical synchronization circuit performs phase alignment between the vertical synchronization signal of the first video signal from the first tuner and the vertical synchronization signal of the second video signal from the second tuner. Thereafter, the first selection circuit sends the phase-matched first output signal and second output signal to the first video head and the second video head, respectively. The first video head and the second video head simultaneously record the first output signal and the second output signal on the video tape, respectively.

Furthermore, in order to reproduce one program program from a videotape on which two program programs are simultaneously recorded, it is sufficient to separate the two reproduction signals simultaneously reproduced from the videotape and reproduce them according to the program program.

In this invention, the first reproduction signal from the first video head and the second reproduction signal from the second video head are sent to the delay circuit and the second selection circuit.

The second selection circuit selects one of the two playback signals from the two video heads (first selection)
. Also, one of the two delayed reproduction signals from the delay circuit is selected (second selection) in the same manner as the first selection.

Then, the reproduction signal selected in the first selection and the reproduction signal selected in the second selection are output alternately. These reproduction signals are then reproduced as video.

[Example] Next, embodiments of the invention will be described with reference to the drawings.

FIG. 1 is a functional block diagram of an embodiment of the present invention.

The VTR device of this embodiment has the function of simultaneously recording two program programs on videotape. In order to realize this function, the VTR device of this embodiment differs from conventional VTR devices in that it uses two tuners 3 and 3.
4 and 35, a distributor 33 that distributes the RF signal to the two tuners 34 and 35, a vertical synchronization matching circuit 36 that adjusts the phase of the vertical synchronization signal of each signal from the tuners 34 and 35, and a vertical synchronization matching circuit 36. A selection circuit 37 that selects and outputs the output signal from the circuit 36, a 1/2 counter 38 that outputs a signal for selecting the signal of the selection circuit 37, and a CH1 video head 1 and a CH2 video head 2. a delay circuit 3 which delays the signal; and a selection circuit 3 which selects and outputs the delayed signal and the original reproduced signal.
2, the signal reproduced by CHI video head 1 and CH
2. What is the external switching signal 40 that instructs the selection circuit 32 to switch with the signal reproduced by the video head 2? In FIG. 1, the same reference numerals are used for parts that are the same as those of a conventional VTR device.

Next, the recording method of the VTR device of this embodiment will be explained.

An RF signal input from an antenna (not shown) is distributed by a distributor 33 to a tuner 34 and a tuner 35 . Here, it is assumed that different program programs are selected in the tuner 34 and the tuner 35. tuner 34
, 35, the different NTSC signals are connected to the parallel synchronous matching concave path 3.
Output to 6. In the vertical synchronization matching circuit 36, the vertical synchronization signal of the NTSC signal from the tuner 34 (hereinafter referred to as the first NTSC signal) and the NTSC signal from the tuner 35 are
The phase of the C signal (hereinafter referred to as second NTSC signal) and the vertical synchronization signal is matched. Then, the vertical synchronization matching circuit 36 outputs the first NTSC signal and the second NTSC signal whose phases have been matched to the selection circuit 37. At the same time, the vertical synchronization matching circuit 36 also outputs 60H as a vertical synchronization signal component. The signal z is output to the 1/2 counter 38.

The 1/2 counter 38 generates a 30Hz signal, outputs this signal to the control 1 roll head 39 as a control signal recording, and records the first NTSC signal and the second NTSC signal.
It is output to the selection circuit 37 as the signal selection m.

The selection circuit 37 uses the 30Hz signal to select the first NTSC signal for one field and the second NNTSC signal for one field.
The TSC signal is switched and output to the converter/color component low-pass conversion section 9. In the converter/color segment low-pass converter 9,
The signal undergoes the aforementioned conversion and is output to the recording amplifier 10. After passing through the recording amplifier 10, the first NTSC signal becomes CH
1 video head 1, the second NTSC signal is CH2
The video head 2 records the video onto a videotape.

The CHI video head 1 sends the first 11 NTSC signals for one field to the CH1 video 1 rack 24.
CH2 video head 2 is the second NTS for one field.
Record the C signal on CH2 video 1 rack 25 (4th
(see figure).

In addition, the audio signal of the program selected by the tuner 34 is sent to the audio rack 22 of the tuner 34.
The audio signal of the program selected in step 5 is recorded on the CH2 audio 1 rack 23 (see FIG. 4).

Next, a method for reproducing a song recorded using the recording method described in "2" will be explained. Here, we will explain the case where a program selected by the tuner 34 is reproduced.

A reproduction signal for one field (hereinafter referred to as a first reproduction signal) reproduced by the CHI video head is sent to the switcher 7 via the CHI reproduction amplifier 3 and the channel equalizer 5. Similarly, the reproduction signal for one field reproduced by the CH 2 video head 2 (hereinafter referred to as the second reproduction signal 3) passes through the CH 2 reproduction amplifier 4 and the channel equalizer 6 to the switch 12. Sent to 7.

In the switcher 7, the first reproduced signal and the second reproduced signal are combined to create a signal for one frame. This signal will be called a combined signal. Figure 2(a)
A schematic diagram of the output signal (combined signal) of the switcher 7 is shown in FIG. 1a, 1b, IC, 1d are the first reproduction signal, 2a,
2b and 2c represent second reproduction signals. Now, if we pay attention to only the first reproduced signal or the second reproduced signal of this combined signal, we find that one field is missing. This combined signal for one frame is output to a delay circuit 31 and a selection circuit 32. In the delay circuit 31,
This combined signal for one frame is output to the selection circuit 32 after being delayed by 262.5H. This signal will be called a delayed signal. Delay circuit 3 is shown in Fig. 2(b).
1 shows a schematic diagram of the output signal (delayed signal) of No. 1. Selection circuit 3
2, the external switching signal 40 selects the first reproduction signal from the combined signal for one frame, and also selects the first reproduction signal from the delayed signals. Then, the first reproduced signal selected from the combined signal and the first reproduced signal selected from the delayed signals are combined to combine signals for one frame. FIG. 2(C) shows a schematic diagram of the output signal of the selection circuit 32.

Here, the first reproduced signal selected from the delayed signals is a signal that compensates for one field missing.

Then, this one frame worth of signals is output to the demodulation circuit 1].

In the demodulation circuit 11, this one frame signal is converted into NT
Convert to SC signal.

In addition, the audio signal is CH 1 audio 1 rack 22
will be played back.

As a result of the above, one of the two program programs is played.

In the VTR device of this embodiment, when recording and reproducing one Bankawa program, the tuner 34 of the two tuners and the CH1 video head of the two video heads are used. This makes it possible to record and reproduce only one program, similar to conventional VTR devices.

[Effects of the Invention] As explained above, the present invention allows the first selection circuit to select the first video signal and the second video signal output from the first tuner and the second tuner. A video signal is sent to a first video head, and a second video signal is sent to a second video head. Therefore, signals of two program programs can be recorded simultaneously on one videotape. Furthermore, by passing the first reproduced video signal reproduced by the first video head and the second reproduced video signal reproduced by the second video head through the delay circuit and the second selection circuit,
The first reproduced video signal or the second reproduced video signal can be reproduced. As a result, one program can be played back from a single videotape that records two programs simultaneously.

[Brief explanation of the drawing]

1 is a functional block diagram of an embodiment of the present invention, FIG. 2(a) is a schematic diagram of the output signal (combined signal) of the switcher 7 of this embodiment, and FIG. 2(b) is a schematic diagram of this embodiment. The output signal of the delay circuit 31 (
2(C) is a schematic diagram of the output signal of the selection circuit 32 of this embodiment. FIG. 3 is a functional block diagram of a conventional VTR device. FIG. 4 is a tape pattern of a videotape. It is a diagram. ■...CHI video head (first video head) 2
...CH2 video head (second video head) 31
... Delay circuit 32 ... Selection circuit (second selection circuit) 34 ... Tuner (first tuner) 35 ... Tuner (second tuner) 36 ... Duplex synchronous matching circuit ( vertical synchronization circuit)
37... Selection circuit (first selection circuit) patent distributor
Kuchimoto Denki Co., Ltd. Agent Patent Attorney Toshiyuki Suzuki 6 Procedural amendment (method)

Claims (1)

[Claims] A VTR device having a first video head and a second video head that performs helical scanning, including a first tuner that outputs a first video signal and a second tuner that outputs a second video signal. a second tuner; and a vertical synchronization device that aligns the phases of the vertical synchronization signal of the first video signal and the vertical synchronization signal of the second video signal and outputs a first output signal and a second output signal. a first selection circuit for sending the first output signal to the first video head and the second output signal to the second video head during recording; and a first selection circuit for sending the first output signal to the first video head and the second output signal to the second video head during recording; a delay circuit that delays a first playback video signal from the video head and a second playback video signal from the second video head; and a delay circuit that delays the first playback video signal and the second playback video signal. receive, select one of them (hereinafter referred to as the first selection), receive the delayed first playback video signal and the second playback video signal, and similarly to the first selection, One of them is selected (hereinafter referred to as the second selection), and the reproduced video signal selected in the first selection and the delayed reproduced video signal selected in the second selection are output alternately. A VTR device comprising a second selection circuit.