JP3241361B2 - Video camera with VTR - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an imaging device for obtaining a video signal and a video camera with a VTR including a recording / reproducing device for recording and reproducing the video signal.

[Summary of the Invention]

The present invention provides a time axis correction unit for correcting a time axis variation of an input video signal, a built-in time axis correction unit, an advanced synchronization signal generation unit for generating an advanced synchronization signal, and a signal obtained by imaging. An imaging unit that forms and outputs a video signal having a synchronization signal synchronized with the advanced synchronization signal; and an output signal of the imaging unit is recorded, and the recorded signal is reproduced in synchronization with the advanced synchronization signal. A recording / reproducing unit that outputs a video signal having a synchronization signal synchronized with the synchronization signal; and one of an output signal of the imaging unit and an output signal of the recording / reproduction unit, and inputs the input video signal to the time axis correction unit. The output signal of the imaging means and the output signal of the recording / reproducing means selected by the selection means are mutually supplied. By being phase locked,
Although the video signal from the recording / reproducing means and the imaging means are both selected by the selecting means and supplied to the time axis correcting means, the output image is not disturbed when the video signal is switched, and the time axis correcting means It is possible to obtain a video camera with a VTR that is extremely easy to operate without having to provide a manual selection switch.

[Conventional technology]

A camera-integrated VTR as a conventional video camera with a VTR will be described below with reference to FIG. still,
A camera-integrated VTR is disclosed, for example, in Japanese Utility Model Application Laid-Open No. Sho 62-14880. In FIG. 9, (1) shows a camera-integrated VTR, and (2) shows a time base collector (time axis correction circuit) connected to and used in the camera-integrated VTR (1).

Next, the configuration of the camera-integrated VTR (1) will be described. (3) is an imaging device, which is composed of an imaging element such as a CCD (charge coupled device), an optical system, an imaging circuit, and the like. Further, the imaging device (3) has a built-in horizontal and vertical synchronization signal / color subcarrier signal generation circuit.

(5) A recording / reproducing apparatus (VTR) comprising a tape guide drum provided with a rotating magnetic head and a servo circuit of a drum motor thereof, a tape running means and a servo circuit of a capstan motor thereof, a recording circuit, and a reproducing circuit. .

When the recording / reproducing device (5) is in a recording state, a luminance signal including a horizontal and vertical synchronizing signal and a color burst signal from the imaging device (3), a red difference signal and a blue difference signal, a rotary magnetic head switching signal, a drum After the reference signal and the like for the motor and the capstan motor are supplied to the recording / reproducing device (5), the luminance signal including the horizontal and vertical synchronization signals and the color burst signal, the red difference signal and the blue difference signal are recorded and processed. Are recorded on the magnetic tape so as to form inclined tracks.

Further, reproduction composite color video signal reproduced from the magnetic tape from the imaging composite color video signal and a recording and reproducing apparatus (5) from the imaging device (3) is switched is supplied to the changeover switch SW _1, the output tanshi OUT ₁ Is output to

Changeover switch SW _1, upon operating the play button of the recording and reproducing apparatus (5) to the reproduction state, the recording and reproducing apparatus (5) side,
When the stop button is operated to set a state other than reproduction such as a stop state, the state is switched to the imaging device (3). In addition, the switch SW ₁ may be switched manually.

Next, a time base collector (2) that can be detachably connected to the camera-integrated VTR (1) or connected via a cable will be described. The time base corrector (2) corrects a time axis fluctuation in the reproduced composite color video signal from the recording / reproducing device (5).

The time base collector (2) quantizes the reproduced composite color video signal into a memory by using a write clock formed based on the horizontal synchronization signal of the reproduced composite color video signal, and writes the data written in the memory into a reference synchronization signal. A known digital time base collector is configured to read and convert an analog signal based on a read clock formed on the basis of the read clock, and the write clock follows the time axis fluctuation of the reproduced composite color video signal. In the process of quantization by the write clock and writing to the memory, time axis fluctuations included in the reproduced composite color video signal are removed. In FIG. 9, the supply of the reference synchronization signal to the time base collector (2) is omitted. The time base corrector (2) corrects a phase change of a reproduced color video signal due to expansion and contraction of the tape, jitter, and the like during reproduction of the recorded magnetic tape, and eliminates image fluctuation of a reproduced image.

The time base collector (2) incorporates an advanced synchronizing signal (horizontal and vertical synchronizing signals) / color subcarrier signal reproducing circuit (2a).

Moreover, the advanced synchronization signal from the advanced synchronization signal / color subcarrier signal generating circuit of a time base corrector (2) (2a) is output to the output terminal OUT _2, which via an input terminal IN ₁ of the camera-integrated VTR (1) It is supplied to the recording / reproducing device (5), and a reproduced composite color video signal synchronized with the horizontal and vertical synchronizing signals is obtained from the recording / reproducing device (5). The reproduced composite color video signal output from the recording / reproducing device (5) is selected by the switch SW1 and supplied to the time base collector (2).

In the time base corrector (2), the time axis correction process involves a delay. However, since the reproduced composite color video signal is advanced by the delay time, the reproduced composite color output from the time base corrector (2) is reproduced. The video signal is synchronized with the reference synchronization signal.

By the way, when the imaging composite color video signal from the imaging device (3) is also supplied to the time base collector (2) to correct the time axis, the imaging composite color video signal is not synchronized with the advanced synchronization signal. in the switching SW _1, disturbed synchronizing the output image of the time base corrector (2), in particular the vertical synchronization disturbance occurs.

Therefore, when a composite color video signal from the camera-integrated VTR (1) is supplied to the time base collector (2), if the composite color video signal is a signal from the imaging device, the time base correction is not performed, and A manual changeover switch (9) for bypassing the signal is provided in the time base collector (2). This switch (9) comprises a movable contact a and fixed contacts b and c. The movable contact a is connected to the output terminal OUT ₃ and the fixed contact b is connected to the output terminal OUT of the camera-integrated VTR (1).
It is connected to the input terminal IN _31, which is connected to _a fixed contact c is connected to the output side of the time base circuit (not shown).

Further, the composite color video signal from the changeover switch SW ₁ of the camera-integrated VTR (1), through the output terminal OUT _1, is supplied to two input terminals IN _31, IN ₃₂ of time base corrector (2). Input terminal IN ₃₂ is connected to the input side of the time base corrector circuits.

When the switch SW ₁ is switched to the recording and reproducing apparatus (5) side, by switching the movable contact a of the switch (9) to the fixed contact c side, reproduced composite color video from the recording and reproducing apparatus (5) Signal, time base collector (2)
To perform time axis correction.

Also, when the switch SW ₁ is being switched to the imaging device (3) side, it switches the movable contact a to a fixed contact b side, as the composite color video signal from the imaging device (3) is not time-base correction I do.

Then, the output terminal OU of the time base collector (2)
From T _3, the composite color video signal is obtained from the image pickup device (3) or the recording and reproducing apparatus (5), so that the reproducing an image by supplying it to a monitor receiver.

[Problems to be solved by the invention]

In the above-described conventional apparatus, in order to avoid synchronization disturbance of the output image, in accordance with the switching of the switch SW ₁ corresponding to the switching of the playback mode and stop mode in the image pickup device (3), if Ne switched manual switch (9) In addition, the operation is complicated.

In view of the above, the present invention relates to a video camera with a VTR such as a camera-integrated VTR, in which the video signals from the recording / reproducing device and the imaging device are both supplied to the time axis correction device, and the reproduced and captured video is An object of the present invention is to propose a method in which the synchronization of an output image is eliminated when a signal is switched.

[Means for solving the problem]

A video camera with a VTR according to the present invention includes a time axis correction unit for correcting a time axis fluctuation of an input video signal, an advanced synchronization signal generation unit for generating an advanced synchronization signal built in the time axis correction unit, Imaging means for forming and outputting a video signal having a synchronization signal synchronized with the advanced synchronization signal from the obtained signal, and recording the output signal of the imaging means, and synchronizing the recorded signal with the advanced synchronization signal. Playback, recording and playback means to output as a video signal having a synchronization signal synchronized with the advanced synchronization signal, and select one of the output signal of the imaging means and the output signal of the recording and playback means,
The output signal of the imaging means and the output signal of the recording / reproducing means selected by the selection means are supplied to the time axis correction means as an input video signal, and the output signals of the recording means are synchronized with each other.

[Operation] According to the present invention described above, by the time axis correction means,
A time axis fluctuation of the input video signal is corrected, an advanced synchronization signal is generated by the advanced synchronization signal generation means, and a video signal having a synchronization signal synchronized with the advanced synchronization signal is formed from a signal obtained by imaging by the imaging means. The output signal of the imaging means is recorded by the recording / reproducing means, and the recorded signal is reproduced in synchronization with the advanced synchronizing signal, and is output as a video signal having a synchronizing signal synchronized with the advanced synchronizing signal. Output, selecting one of the output signal of the imaging means and the output signal of the recording and reproduction means by the selection means,
The output signal of the imaging unit and the output signal of the recording / reproducing unit, which are supplied to the time axis correction unit as an input video signal and selected by the selection unit, are phase-synchronized with each other.

〔Example〕

Hereinafter, the present invention will be described with reference to FIGS.
The eighth embodiment will be described in detail.
Parts corresponding to those of the conventional example described with reference to FIG. 9 are denoted by the same reference numerals, and redundant description is omitted.

FIG. 1 shows a first embodiment of the present invention, which will be described below. First, the camera-integrated VTR (1) will be described. (4) a synchronization / subcarrier generation circuit of the imaging device (3), which generates a water-based and vertical synchronization signal and a color subcarrier signal.

SW ₂ is a changeover switch for switching between an advanced synchronization signal from the input terminal IN _1, an external synchronization signal (horizontal and vertical synchronization signals) and an external color burst signal from the genlock input terminal IN _2, and an imaging device (3). To supply. (6)
Is the advanced synchronization signal detection circuit for switching and controlling the switch SW _2, usually when the switch SW ₂ a time base corrector which is switched to the input terminal IN ₂ side (2) is mounted on the camera-integrated VTR, the by detecting the advanced synchronization signal from the time base corrector (2), is switched to the input terminal iN ₁ side, the advanced synchronization signal to be supplied to the image pickup device (3).

Then, the sync / color subcarrier generating circuit (4) is an imaging device (3), depending on the switching state of the switch SW _2, the input terminal I
A synchronization signal synchronized to the advanced synchronization signal from the N _1,
Irofuku carrier signal, or outputs respectively synchronized with the synchronizing signal to the synchronizing signal and color burst signal from the input terminal IN ₂ and Irofuku carrier signal.

The time base collector (2) does not include the switch (9) as in the conventional example of FIG. 9, and the input / output sides of the time base collector circuit (not shown) are connected to the input terminal IN _3.
And it is connected to the output terminal OUT _3.

Next, the operation of the first embodiment will be described. When the time base corrector (2) is mounted on the camera-integrated VTR, advanced synchronization signal from the time base corrector (2) (horizontal and vertical sync signals) via the input terminal IN _1, switches SW ₂ and Advanced is supplied to the synchronizing signal detecting circuit (6), the advanced synchronization signal detection circuit (6), the switch SW ₂ is switched to the input terminal iN ₁ side, the advanced synchronization signal switch SW ₂
To generate a synchronizing signal (horizontal and vertical synchronizing signals) synchronized with the synchronizing / subcarrier generating circuit of the imaging device (3).

When the recording / reproducing device (5) is in a recording state, a luminance signal including a horizontal and vertical synchronizing signal and a color burst signal from the imaging device (3), a red difference signal and a blue difference signal, a rotary magnetic head switching signal, a drum Servo reference signals for the motor and the capstan motor are supplied to the recording / reproducing device (5), and the luminance signal including the horizontal and vertical synchronizing signals and the color burst signal, the red difference signal and the blue difference signal are subjected to recording signal processing. After that, recording is performed on the magnetic tape so as to form inclined tracks.

Also, when the recording / reproducing device (5) is in a state other than the reproducing mode and in the reproducing state, respectively, the reproduced composite color video signal from the imaging device (3) and the reproducing reproduced from the magnetic tape from the recording / reproducing device (5). composite color video signal is switched is supplied to the changeover switch SW _1, is output to the output terminal OUT _1. The composite color video signal from this output terminal OUT ₁ is
It is supplied to the time base corrector circuit through the input terminal IN _{3 of the} time base corrector (2) to correct the time axis, and the corrected composite color video signal is output to the output terminal OUT ₃
Is output to

Then, the composite color video signal from the imaging device (3) and the recording and reproducing apparatus (5) Because both are synchronized in the advanced synchronization signal from the time base corrector (2), by switching of the switch SW _1, time Synchronization disorder of the output screen of the base collector (2), in particular, vertical synchronization disorder does not occur.

In addition, the time base collector (2) is a camera-integrated VTR
When the switch is removed from (1), the switch SW ₂ is connected to the input terminal I.
Because switched to N ₂ side, is supplied to the sync / subcarrier generating circuit of the external synchronizing signal and external color burst signal is the imaging apparatus from the input terminal _{IN 2 (3) (4)} , the synchronization now to external synchronization signal A color subcarrier signal synchronized with the synchronized signal and the external color burst signal is generated.

In this case, the composite color video signal from the imaging device (3) and the recording and reproducing apparatus (5) is because both synchronized with the external synchronizing signal and external color burst signal from the input terminal IN _2, from the output terminal OUT ₁ image of the composite color video signal is disturbed synchronization by the switching of the switch SW _1, no particular that the vertical synchronization disturbance occurs.

Next, a second embodiment of the present invention will be described with reference to FIG. The camera-integrated VTR (1) in FIG. 2 uses the synchronization / subcarrier generation circuit (4) in the image-capturing device (3) of the camera-integrated VTR (1) described with reference to FIG. This is an example provided outside. In this case,
In subcarrier generating circuit (4), and generates a color subcarrier signal synchronized with the external color burst signal from the input terminal IN _2, always supplied to the image pickup device (3). Further, in the synchronization / subcarrier generating circuit (4), the input synchronizing signal synchronized with the external synchronization signal from the terminal IN ₂ is generated, and the synchronization signal, the switch SW ₃ and advanced synchronization signal from the input terminal IN ₁ The data is switched and supplied to the imaging device (3).

Next, a third embodiment of the present invention will be described with reference to FIG. (8) In camera-integrated VTR (1)
Is a burst gate circuit, (7) is this gate circuit (8)
Is a circuit for generating a gate signal to be supplied to. The advanced synchronization signal from the time base collector (2) is supplied to a gate signal generation circuit (7), and a burst sampling pulse is generated based on the advanced synchronization signal and supplied to the gate circuit (8). The color subcarrier signal from the advanced sync signal / subcarrier signal generation circuit (2a) of the time base collector (2) is output to the output terminal OUT ₄ of the time base collector (2) and the input terminal IN of the camera-integrated VTR (1). ₄ is supplied to a burst gate circuit (8) through, to obtain a color burst signal, after combining at this with advanced synchronizing signal adding circuit (9) to the switch SW _4. Then, the sync signal and color burst signal from the summing circuit (9) and the input terminal IN _2, and supplies the sync / subcarrier generating circuit of the image pickup device (3) (4) is switched to the switch SW _4, each of A synchronization signal and a chrominance subcarrier signal synchronized with the signal are generated.

Next, a fourth embodiment of the present invention will be described with reference to FIG. In the camera-integrated VTR (1), in synchronization provided outside the imaging device (3) / subcarrier generating circuit (4), respectively to the external sync signal and color burst signal from the input terminal IN ₂ s synchronized synchronization signals and A color sub-carrier signal is generated, and these signals are combined with an advanced synchronization signal / multi-carrier generation circuit (2) of a time base collector (2).
a synchronization signal and Irofuku carrier signal from a), to switch the switch SW _5, SW _6, which is controlled by the respective advanced synchronization signal detection circuit (6), and supplies to the image pickup device (3), to each of the signal A red difference signal and a blue difference signal including a horizontal and vertical synchronization signal of a synchronized imaging composite color video signal and a color burst signal, a rotating magnetic head switching signal, a servo reference signal for a drum motor and a capstan motor, and the like are generated. ing.

Next, a fifth embodiment of the present invention will be described with reference to FIG. In the camera-integrated VTR (1), the input terminal IN
₂ , when the external synchronization signal for genlock or the advanced synchronization signal from the time base collector (2) is selectively supplied, the voltage of the advanced synchronization signal becomes 2
To which the at ~4V _PP, a voltage of the genlock signal 0.28V
Because much lower and _PP, switching these synchronization signals at the switch SW _7, and supplied to a level attenuator (8) towards the advanced synchronization signal, and allowed lower the level, the level of the synchronizing signal for genlock After that, the synchronization / subcarrier generation circuit (4) of the imaging device (3)
To supply it. The switch SW ₇ is in addition to switch manually, provided advanced synchronization signal detection circuit, may be switched at the detected output.

Next, a sixth embodiment of the present invention will be described with reference to FIG. In the camera-integrated VTR (1), the input terminal I
The external sync signal and advanced synchronization signal from an external color burst signal or the input terminal IN ₂ from N _2, selectively synchronously provided outside the imaging apparatus / subcarrier generating circuit (4)
And a level attenuator (8), and a color / subcarrier signal synchronized with an external color burst signal from a synchronization / subcarrier generation circuit (4) to an image pickup device (3). external synchronization with the synchronizing signal sync signal and advanced synchronization signal advanced synchronization signals which are caused to decrease the level by the level attenuator (8) of from 4) is switched by the switch SW _8, and supplies to the image pickup device (3). Incidentally, the switch SW ₈ is switched by the detection output of the manual or the advanced synchronization signal detection circuit.

Next, a seventh embodiment of the present invention will be described with reference to FIG. In the camera-integrated VTR (1), the external synchronizing signal and external color burst signal or the advanced synchronization signal from the input terminal IN ₂ is supplied to the switch SW _9, by the switching of the switch SW _9, the former direct imaging device (3 ) Is supplied to the synchronization / subcarrier generation circuit (4) and the gate signal generation circuit (7), and the latter is supplied to the addition circuit (9). Further, to obtain a color burst signal is supplied to a burst gate circuit color sub-carrier signal from the input terminal IN ₄ (8), by a gate signal from the gate signal generating circuit made based on the advanced synchronization signal (7) The signal is supplied to an addition circuit (9) to be added to the advanced synchronization signal, and the added output is supplied to a synchronization / subcarrier generation circuit (4).

The switch SW ₉ is manually, or by switches in response to detection of the advanced synchronization signal.

An eighth embodiment of the present invention will be described with reference to FIG. In the camera-integrated VTR (1), the external synchronizing signal and external color burst signal or the advanced synchronization signal from the input terminal IN _2, the image pickup apparatus outside provided sync / subcarrier generating circuit (3) (4) and level is supplied to an attenuator (8) to the image pickup device (3) to switch the color subcarrier signal from the color subcarrier signal and the input terminal iN ₄ from the sync / subcarrier generating circuit (4) in the switch SW ₁₁ At the same time, the synchronization signal and the advanced synchronization signal from the synchronization / subcarrier generation circuit (4) are level-attenuated (8).
And supplies to the image pickup device (3) those allowed reduced levels by switching the switch SW ₁₀ by. In addition, switch SW
₁₀ and SW ₁₁ are switched manually or by a detection output of an advanced synchronization signal detection circuit.

In the above-described first to fourth embodiments and the fifth to eighth embodiments, when an advanced synchronization signal detecting circuit is provided, the time base collector (2) is integrated with a camera.
The switch S depends on whether it is mounted on the VTR (1) or not.
Since W ₂ ~SW ₁₁ automatically switching switched, there is no manual hassle of switching the switch.

Also, when using a camera-integrated VTR for news gathering or the like, it is very convenient because it does not take much time to reproduce the recorded image in the meantime.

In addition, by supplying an external synchronization signal and an external color burst signal to the time base collector (2), the time base collector (2) can be used in a genlock state, and the advanced synchronization signal and the color subcarrier signal from the time base collector (2) can be captured by the image pickup device ( In the case of supplying the image data to 3), the image pickup color composite video signal from the image pickup device can also be phase-locked, so that color matching between a plurality of image pickup devices becomes possible. No hue difference occurs.

In the above embodiment, the present invention is applied to a camera-integrated VTR.
Although the case where the present invention is applied has been described, the present invention can also be applied to a video camera with a VTR in which an image pickup device and a recording / reproducing device are detachably used or connected via a cable.

The time base collector (2) is a camera-integrated VT
R (1) may be provided integrally or detachably, or may be connected via a cable.

〔The invention's effect〕

According to the present invention described above, a time axis correction means for correcting the time axis of an input video signal, an advanced synchronization signal generation means for generating an advanced synchronization signal, which is built in the time axis correction means, can be obtained by imaging. An imaging unit that forms and outputs a video signal having a synchronization signal synchronized with the advanced synchronization signal from the signal, and records an output signal of the imaging unit and reproduces the recorded signal in synchronization with the advanced synchronization signal. A recording / reproducing unit that outputs a video signal having a synchronization signal synchronized with the advanced synchronization signal, and one of an output signal of the imaging unit and an output signal of the recording / reproducing unit, and selects one of the output signal and the time axis correction unit. A selection signal supplied as an input video signal, the output signal of the imaging means and the output signal of the recording / reproduction means selected by the selection means. Are synchronized with each other, so that the video signals from the recording / reproducing means and the imaging means are both selected by the selecting means and supplied to the time axis correcting means. There is no disturbance, and there is no need to provide a manual selection switch for the time axis correction means, so that a video camera with a VTR which is very easy to operate and has a simple configuration can be obtained.

[Brief description of the drawings]

1 to 8 are block diagrams showing first to eighth embodiments, respectively, and FIG. 9 is a block diagram showing a conventional example. (1) is a camera-integrated VTR, (2) is a time base collector, (2a) is an advanced synchronization signal / subcarrier generation circuit, (3) is an imaging device, (4) is a synchronization / subcarrier generation circuit, and (5) ) Is a recording / reproducing device, (6) is an advanced synchronization signal generation circuit, (7) is a gate signal generation circuit, (8) is a gate circuit, and (9) is an addition circuit.

Claims (1)

(57) [Claims] 1. A time axis correction means for correcting a time axis fluctuation of an input video signal, an advanced synchronization signal generation means for generating an advanced synchronization signal built in the time axis correction means, and a signal obtained by imaging. Imaging means for forming and outputting a video signal having a synchronization signal synchronized with the advanced synchronization signal; recording an output signal of the imaging means; and reproducing the recorded signal in synchronization with the advanced synchronization signal Recording / reproducing means for outputting as a video signal having a synchronization signal synchronized with the advanced synchronization signal; and selecting one of an output signal of the imaging means and an output signal of the recording / reproduction means, Selecting means for supplying to the correcting means as an input video signal, the output signal of the imaging means selected by the selecting means and the recording The output signal of the means, VTR with a video camera, characterized in that it is phase-synchronized with each other.