JPH04321965A - Video signal recording device - Google Patents

Abstract

PURPOSE:To provide a video signal recording device which can prepare an editing base tape without an external signal source and can prevent the run-away of a motor at any time, in a recording device provided mainly for editing in broadcasting or business. CONSTITUTION:A signal discriminating device 13 to discriminate the presence of an input video signal, a switch 15, a reference signal generator 12 and a reference video signal generator 14 are provided, and when a normal video signal is not impressed to the input, the switch 15 is shifted by the output signal of the signal discriminating device 13, and based on the video signal synchronized with the reference signal generator 12 and generated by the reference video signal generator 14, the servo is applied and the signal is recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal recording apparatus.

0002

2. Description of the Related Art In recent years, programs used for broadcasting and business purposes are created by editing with a VTR based on several materials.

[0003] When performing editing work using a conventional VTR, first, a standard video signal is recorded on a raw tape together with a time code, and necessary materials are inserted and edited based on the tape.

[0004] A conventional VTR will be explained below. FIG. 2 is a block diagram showing the configuration of this conventional VTR. In FIG. 2, 1 is a video signal input terminal, 2 is a video signal recording circuit, 3 is a video head, 4 is a reference signal separator, and 5 is a video signal input terminal.
is a servo circuit, 6 is a rotational phase detector that detects the rotational phase of the head cylinder unit 10 on which the video head is mounted, 7 is a drive circuit that drives the head cylinder unit 10, 8 is a control signal recording circuit, and 9 is a control head , 11 is a switch, and circuit 12 is a reference signal generation circuit.

Regarding the VTR configured as described above,
The operation will be explained below. The video signal applied to the input terminal 1 is subjected to recording processing in a video signal recording circuit 2, and then recorded on a tape (not shown) by a video head 3. At the same time, the video signal applied to the input terminal 1 is guided to the reference signal separator 4, where reference signals such as a vertical synchronizing signal, a frame signal, and a color frame signal are separated. The switch 11 is connected to the terminal R side during recording,
These reference signals are provided to the servo circuit 5. A signal indicating the rotational phase of the head cylinder unit 10 detected by the rotational phase detector 6 is supplied to one input of the servo circuit 5, and the signal is compared in phase with a reference signal. By driving the head cylinder unit 10 via the drive circuit 7 with the output, the reference position of the video signal is controlled to be recorded at a fixed position on the tape, that is, the position where the head cylinder unit 10 is at the reference phase. At this time, the reference signal is processed by the control signal recording circuit 8, and a control signal is recorded on the tape by the control head 9 as a signal representing the tape position where the reference position of the video signal is recorded.

During playback, the switch 11 is connected to the terminal P side, and the servo circuit 5 is controlled by a reference signal generated by an internal reference signal generator 12 and a signal indicating the rotational phase of the head cylinder unit 10. The reference position of the video signal recorded on the tape is reproduced in synchronization with the output of the reference signal generator 12. In addition, by comparing the control signal reproduced from the control head 9 with the rotational phase of the head cylinder unit 10 to control tape feeding, and matching the reference position of the video signal recorded on the tape with the rotational reference phase, During playback, the playback video head is controlled to accurately trace the recording track.

[0007] In order to perform editing on a VTR configured as described above and create one completed program from multiple materials, color bar (CB) and black burst (B) must be used in advance.
A tape on which a reference video signal such as B) is recorded together with a time code (TC) is prepared as a base tape, and each material is inserted and edited onto the tape.

[0008]

However, in order to create a base tape for editing with the conventional VTR described above, it is necessary to prepare an external signal source for a reference signal. Additionally, if an abnormality occurs in the video signal applied to the video signal output terminal 1 during recording, or if a failure such as a disconnection or poor contact occurs in the connecting cable, the correct reference signal will not be supplied to the servo circuit 5, and the head This may cause the cylinder motor that constitutes the cylinder unit 10 to run out of control, causing a failure. Furthermore, if such a failure occurs during recording of the reference video signal, there is a problem in that recording must be performed again from the beginning.

[0009] The present invention solves the above-mentioned problems of the conventional art, and it is possible to eliminate the need for an external reference signal source, prevent abnormal operation of the cylinder motor under any circumstances, and create a base tape for editing quickly and without failure. The purpose of the present invention is to provide a video signal recording device that can perform the following steps.

0010

To achieve this object, the video signal recording device of the present invention is configured to record an internally generated reference video signal when no video signal is applied to the input.

Further, the video signal recording device of the present invention determines whether or not a video signal is applied to the input, and when the video signal is applied, the rotation of the rotary head for recording the video signal based on the input video signal is performed. and recording the input video signal on a recording medium while controlling the phase, and when the input video signal is not applied, the reference signal for controlling the rotary head is switched to an internally generated reference signal based on the discrimination signal, and
It is configured to record a video signal created in synchronization with the internally generated reference signal.

Furthermore, the video signal recording apparatus of the present invention is configured to control the rotation and phase of the head for reproducing the video signal based on an internally generated reference signal when reproducing the recorded video signal.

[0013]

[Operation] With the above-described configuration, the present invention determines the state even when the reference video signal is not applied, and internally generates the reference signal that controls the rotation and phase of the rotary head that records the video signal based on the determination result. By switching to the generated reference signal and recording by switching the video signal to be recorded to a video signal created in synchronization with the reference signal, it is possible to quickly create a base tape for editing.

[0014] Furthermore, even when no video signal is applied to the video signal input terminal or when an abnormality occurs in the signal source or cable, a normal reference signal is always supplied to the servo circuit by switching in the same manner based on the above-mentioned determination result. It is possible to prevent abnormal rotation of the cylinder motor and to create a normal editing base tape.

[0015]

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 the configuration of a video signal recording apparatus (VTR) in an embodiment of the present invention. Figure 1
2, the same components as in FIG. 2 are represented by the same reference numerals and perform the same operations. 13 is a signal discriminator, 14 is a reference video signal generator, and 15 is a switch.

The VTR of this embodiment configured as described above
The operation will be explained below. The video signal input terminal 1 is connected to a signal discriminator 13, which determines whether or not there is an input video signal. When a normal video signal is applied to the terminal 1, the output signal of the signal discriminator 13 connects the switch 15 to the terminal a side. Thereafter, the video signal applied to the terminal 1 is recorded in the same manner as in the embodiment shown in FIG.

When a normal video signal is not applied to the terminal 1, the output signal of the signal discriminator 13 is inverted, and the switch 15 is connected to the terminal b side. Meanwhile, a reference video signal is created by a reference video signal creator 14 in synchronization with the reference signal generated by the reference signal generator 12. This reference video signal has a composite synchronization signal and a reference burst signal created in synchronization with the output signal of the reference signal generator 12 (the burst signal may be omitted for recording only black and white signals).
A color bar (CB) signal or a constant level signal may be used. In particular, it is very easy to create a signal with a constant level. When this constant level is set as a black level, it becomes a black burst (BB) signal. The CB signal and BB signal created in this manner are supplied to the next stage via the b-side terminal of the switch 15, and are recorded in the same manner. This recorded signal can also be used as a reference signal for adjustment.

If the signal discriminator 13 is configured to separate the synchronizing signal and detect its presence or absence, even when an abnormal signal is applied to the terminal 1, it can be determined that there is no signal.

When reproducing the tape recorded in this manner, the switch 11 is connected to the terminal P side, and controls the servo circuit 5 based on the output signal of the reference signal generator 12 to perform the same operation as in the embodiment shown in FIG. The same is done. In this way, since the recording video signal is created when there is no input video signal by sharing the reference signal generator 12 used as a reference during reproduction, it can be done without significantly increasing the circuit scale.

[0021] Furthermore, when reproduction is performed in synchronization with an external video signal, the reference signal generator 12 may be configured to generate the signal in synchronization with the external video signal. In this case, if no signal is connected to the input terminal 1, an internal reference video signal synchronized with an external video signal can be recorded.

Furthermore, even if the external signal source fails or the cable is disconnected while the reference signal generator 12 is synchronized with an external video signal and the video signal is applied to the terminal 1 for recording, Since the reference signal generator 12 continues to generate the reference signal in a self-running manner continuously from the previous state, continuous recording can be continued simply by switching the switch 15 from terminal a to terminal b.

[0023]

As described above, the present invention detects the presence or absence of an input video signal, and when a normal video signal is not input, records the reference video signal generated internally to detect the signal source. You can create a base tape for editing without using it, or use it as a reference for adjustments.

Furthermore, according to the present invention, even if an external signal source fails or a cable is disconnected,
By constantly supplying a reference signal to the servo circuit, it is possible to prevent the cylinder motor from running out of control, and normal recording can be continued, making it possible to quickly create an editing base tape.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a VTR in an embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of a conventional VTR.

[Explanation of symbols]

1 Video signal input terminal 2 Video signal recording circuit 3 Video head 4 Reference signal separator 5 Servo circuit 6 Rotational phase detector 7 Drive circuit 10 Head cylinder unit 11, 15 Switch 12 Reference signal generator 13 Signal discriminator 14 Standard video signal generator

Claims (4)

[Claims] 1. A video signal recording device that records an internally generated reference video signal when no video signal is applied to an input. 2. The video signal recording device according to claim 1, wherein the internally generated reference video signal is a constant level video signal including a composite synchronization signal and a reference burst signal. 3. A device for recording a video signal, which determines whether or not a video signal is applied to an input, and when the video signal is applied, a rotary head that records the video signal based on the input video signal. While controlling the rotation and phase, the input video signal is recorded on a recording medium, and when no video signal is applied, the reference signal for controlling the rotary head is switched to an internally generated reference signal based on the discrimination signal, and A video signal recording device that records a video signal created in synchronization with the internally generated reference signal. 4. A device for recording a video signal, comprising: a rotary head that determines whether or not a video signal is applied to an input, and when the video signal is applied, records the video signal based on the input video signal; While controlling the rotation and phase, the input video signal is recorded on a recording medium, and when no video signal is applied, the reference signal for controlling the rotary head is switched to an internally generated reference signal based on the discrimination signal, and A video signal recording device that records a video signal created in synchronization with the internally generated reference signal, and controls the rotation and phase of the head based on the internally generated reference signal during playback.