JPS5941976A - Controlling circuit of video camera - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for a video camera equipped with a fader circuit, and particularly to a control device for controlling an external device such as a video tape recorder VTR connected to a video camera. The present invention relates to a control circuit for a video camera in which switching and setting of the operation mode of the fader circuit is performed by operating a common switch.

[Background technology and its problems]

Generally, in a video system in which the video output obtained from a video camera is recorded on a VTR, operability can be improved by remotely controlling the operation of an external device such as a VTR connected to the video camera from the camera body. I'm trying to improve. In addition, when performing continuous shooting with a video system such as the one mentioned above, in order to smoothly continue the valley cut image, a fader function is provided to perform fade-in control to gradually brighten the subject image and fade-out control to darken it. Equipped with a video camera. In general, the fader function provided in a video camera is often used selectively depending on the content of the image to be shot, and the fader mode for controlling the fade in/fade out mentioned above, The fader circuit is mounted on the video camera body as a fader circuit whose operation is controlled by a mode controller that can freely switch between a normal mode in which photography is performed without performing the above control.

Conventionally, in video cameras equipped with a remote control function for external devices and a fader function as described above, a so-called start/stop switch for external control and a phego switch for switching modes of the fader function are independently provided. There is. By operating the fader switch, a 11j1 signal (pulse) is supplied to the mode controller M1)C in the video camera to alternately switch between fader mode and normal mode.

In addition, by operating the star 1-stop switch,
An external control signal (pulse) is supplied to the magnetic recording tape drive unit in V T t+ to run and stop the direct recording tape.

By the way, when shooting in fader mode with a video camera having the above configuration, first switch the mode from normal mode to fader mode by turning on the fader mode switch, and then start the start strategy. The disadvantage is that the operation is complicated and undesirable because the magnetic recording tape must be switched in small steps to start and stop the magnetic recording tape and to perform fade-in or fade-out.

[Purpose of the invention]

In view of the above-mentioned problems in video systems, the present invention unifies the operation mode switching operation of the fader circuit, which has conventionally been performed independently, and the remote control operation of an external device, so that a predetermined operation can be performed with a single operation. An object of the present invention is to improve the operability of a video camera by supplying video output according to the operation mode to an external device, for example, V'I''R.

[Summary of the invention]

The present invention is operated by a mode controller.
In a video camera equipped with a fader circuit, a switch for commanding normal mode operation of the mode controller and a switch for commanding fader mode operation are provided, and the OR output of the command signals from each of the switches is used as an external control signal. This paper proposes a fljll X1 circuit for a video camera, which is characterized by output.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3.

1 is a video camera to which the present invention is applied, and this video camera 1 has a normal start/stop switch 2 (hereinafter referred to as 1 normal switch) and a fader start/stop switch 3 (hereinafter referred to as ``fader switch''). .

Further, 4, 5.6 are video signal output terminals, audio signal output terminals, and external control signal output terminals provided in the video camera 1, and each of these output terminals 4.5.6 is a video signal transmission line 7. , an audio signal transmission line 8 and an external control signal transmission line 9 to respective input terminals 11, 12, and 13 of the video table recorder 10.

To explain the inside of the video camera 1 using FIG. 2, first, 20 is a video signal amplifier, and this video signal amplifier 20 amplifies the video signal from the camera unit 21 and converts the amplified video signal into a gain Adder 2 via fljlJ control circuit 22
Supply to 3. The adder 23 adds the horizontal and vertical synchronizing signals supplied from the synchronizing signal input terminal 24 to the video signal to form a composite video signal. Then, this composite video signal is output from the video signal output terminal 4.

25 is an audio signal amplifier that amplifies the audio signal from the microphone 26 and supplies the amplified audio signal to the audio signal output terminal 5 via the gain control circuit 27.

Reference numeral 30 denotes a control circuit to which command signals generated by operating the normal switch 2 and fader switch 3 are supplied.

This control circuit 30 outputs the logical sum output of the command signals from each of the switches 2 and 3 as an external control signal from an external control signal output terminal 6, and
The operation mode (normal mode/fader mode) specified by the operation 1 activates the trowel mode controller 31.

The mode controller 31 in this embodiment is configured to alternately repeat the normal mode and fader mode each time a mode control signal is supplied from the control circuit 30. In the normal mode, the mode controller 31 controls the operation of the fader circuit 32 so as to maintain the respective gains of the aforementioned gain control side j circuits 22 and 27 constant. Then, in the case of the remote controller, a fader signal for controlling each gain of the valley gain control circuit 22.27 is outputted from the fader circuit 32, and the gain of each gain control circuit 22.27 is controlled. Increase or decrease the video signal and audio signal to fade out or fade in.

The upper SG fader circuit 32 is supplied with either the fake signal output from the fader circuit 32 or the synchronization signal supplied from the input terminal 24 in synchronization with the video signal and audio signal. There is.

Further, the motor controller 31 supplies a signal indicating the current mode (normal mode 1 or fader mode) to the electric arm view finder 33. In addition to notifying the viewer of the current mode, the control is performed using a predetermined output signal, that is, a hello level signal in the normal mode in this embodiment, and a H/A 1/HELL signal in the Fator mode as the mode signal M. It is supplied to the circuit 30.

In this embodiment, the normal switch 2 is connected in series between the ground and the positive power supply terminal, and supplies a command signal to the control circuit 30 as a falling pulse that becomes a low level when closed. . Similarly, the fader switch 3 also supplies a command signal as a falling pulse to the control circuit 30. 30B is a second command signal input terminal to which a command signal from the operation of the fader switch 3 is supplied. , 30C are mode signal input terminals to which the above-mentioned mode signal M having a logical value corresponding to the operation mode of the mode controller 31 is supplied.

The first command signal input terminal 30A is connected to a first NOlt gate 40 and a first integration circuit 41. Further, the second command input terminal 30B is connected to the second N O l
(, connected to the gate 42 and the second integrating circuit 43. The output sides of the first and second integrating circuits 41 and 43 output external control signals via diodes 48 and 49 in opposite directions, respectively. It is connected to the terminal 6. Therefore, the respective command signals supplied to the first and second command signal input terminals 3[IA, 30B, the logical sum output thereof is connected to the respective diodes 4B, 49. The signal is then output from the external control signal output terminal 6 as an external control signal.

Further, the first NOR cable 1 40 is connected from the mode signal input terminal 30C to the third N U It cable 1.
The mote signal M supplied via the inverter by 45
gated by. In addition, the second N
The gate 42 is gate-controlled by a mode signal M directly supplied from the mote signal input terminal 30C. The first and second N O 11 gates 40
．． 42, the mode controller 31 is in the normal mode 1-
When the first NO 1% gate is set to 40
When the mode controller 1-roller 31 is set to the fader mode, the first NOR gate 40 is opened and the second N gate 42 is opened. 0 1 (, the gate 42 is reciprocally controlled by the mode signal M supplied to the mode signal input terminal 30C so that the gate 42 is closed. The command signal is transmitted from the first and second NOR gate 1.
- 4th N selectively via 40, 42;

The signal is supplied to the R gate 46, and is supplied from the fourth N□R gate 46 to the mode controller 31 as a mode control signal MCP through the signal output terminal 30D. Here, when the mode controller 31 is set to the normal mode, the command signal generated by the operation of the normal switch 2 is output as a mode control signal since the first N 0 11 and gate 40 are closed. Instead, the mode controller 31
It is output as a mode control signal only when the mode controller 31 is set to the fader mode, and the operation mode of the mode controller 31 is inverted to set the normal mode. Similarly, a command signal generated by operating the fader switch 3 is output as a mode control signal when the mode control 31 is in the normal mode, and reverses the operation mode of the mode controller 31.

Next, the specific operation of the control circuit 30 will be explained. First, if the initial state, that is, the state before operating each of the switches 2 and 3 above, is the normal mode! Let me explain in detail.

In this embodiment, the electric h'J viewfinder 33 supplies a low level signal as the mode signal M to the control circuit 30 in the normal mode. Therefore, the low level mode signal M is supplied to the second NOR circuit 42, and the high level inverted output signal N3 inverted by the third NOR circuit 45 is supplied to the first NOR circuit 42.
It is supplied to circuit 40.

Furthermore, before the switching operation, the normal switch 2 and the fader switch 3 each supply high level signals to the first and second NOR circuits 40 and 42. therefore,
At this time, the output signals Nr and N2 of the first and second NOR circuits 40 and 42 are both at low level. Therefore, the output signal N4 of the fourth NOIt circuit 46 is at a high level.

In the initial state described above, first operate the normal switch 2 (
The case of ON, OFF operation) will be explained.

At this time, when the normal switch 2 is turned on, the switch signal 5WPI is delayed for a predetermined time by the first integrating circuit 41 and then supplied to the external control signal output terminal 6, and the magnetic marking tape in the VTR is supplied to the external control signal output terminal 6. Have them run. Further, at this time, the low level switch signal SwPl is supplied to the first N Q R circuit 40;
o) R circuit 40 cl' output signal N remains at low level. Therefore, the fourth NOR circuit 46 does not output the mode control signals γ and CP for operating the mode controller 31, and the mode remains in the normal mode.

Next, the case where the fader switch 3 is operated will be explained. At this time, the switch signal 5WP2 generated by turning on the fader switch 3 is sent to the Sufu-1-stop control signal output terminal 6 via the second integrating circuit 43, similar to when the normal switch 2 is turned on as described above. The magnetic recording tape is supplied to cause the magnetic recording tape within the VTR to run.

By the way, the first and second integrating circuits 41 and 43 are provided to prevent malfunctions, and for example, if an attempt is made to shoot in fader mode when the initial state is normal mode (fade-in, fade out, etc.)
The magnetic recording tape is fed and stopped after the mode has been completely converted so that the magnetic recording tape is not fed or stopped before the mode is changed from normal to fader.

At the same time, the low-level switch signal SwP2 is supplied to the second NOR circuit 42, so that the second NOR
Circuit 42 outputs a high level signal. Therefore, the fourth
The NOR circuit 46 receives the low level signal output from the first NOR circuit 40 and the second NOR circuit 42.
A high level signal output from the fourth N
The OR circuit 46 outputs a low-level pulse signal, ie, the mode control signal MCP. As a result, the normal mode is switched to the fader mode.

The mode controller 31 supplies an output signal to the fader circuit 32 and also supplies a mode display switching signal MTP to the electric view finder 33. As a result, the electric view finder 33 displays the fade mode, and the control circuit 30 receives a high-level mode signal M at the time of the fade mode.
supply.

As is clear from the above description, when the initial state is the normal mode, the low level motor signal M output from the electric viewfinder 33 causes the second N
011. When the gate of the circuit 42 is opened, a high level inverted output N obtained by inverting the mode signal M is generated.
3 closes the gate of the first NO14 circuit 40.

Therefore, the second N (JR circuit 4
When a switch signal 8wP 2 is supplied to 2, that is,
4th N 01 only when fader switch 3 is operated
The L circuit 46 supplies a mote control signal (MCI) to the mode controller 31 to switch from normal mode to fader mode.

Next, the case where the initial state is the fader mode will be explained.

At this time, the electric view finder 33 supplies the high-level mote signal M to the second N □ it circuit 42, and also supplies the low-level inverted output of the third N (J l(, signal N3 to the first N
Supply 40 ridges of OItu road. The normal switch 2 and the -da switch 3 both supply high level signals to the first and second NOit circuits 40 and 42. Therefore, the first and second N Oit circuits 4Ll,
42 and the fourth NOR circuit 42 also supply a low level output signal N4 to the circuit 46, and the fourth NOR circuit 46 outputs a high level signal.

First, a case will be described in which the normal switch 2 is operated in the above-mentioned state.

First, the switch signal 5WPI obtained by operating the normal switch 2 is supplied to the external control signal output terminal 6 via the first integrating circuit 41 after a predetermined period of time has elapsed.

At the same time, the low level switch signal Swl' 1 is supplied to the first NOR circuit 40. As a result, while the first N 01 (circuit 40) had been outputting a low level signal (before the switch operation), a high level output signal is output to the fourth N OIt, circuit 46. supply

Therefore, the fourth NOR circuit 46 outputs a low-level pulse signal, that is, the mode control signal MCP, and switches the mode of the mode controller 1-roller 31 from the fader mode to the normal mode.

Next, a case in which the fader switch 3 is operated will be explained. At this time, the switch signal 5WP2 is supplied to the external control signal output terminal 6 via the second integration circuit 43, as in the case described above. Then, the low-level switch signal SwP2 is supplied to the second NOR circuit 42, but since the gate of the circuit 42 is closed by the high-level mode signal M, the low-level signal SwP2 is also supplied to the second NOR circuit 42 as in the initial state. Output.

Therefore, the mode control signal MCP is not output from the fourth N01 (circuit 46), and therefore the mode remains the fade mode.

As is clear from the above description, the high level mode signal M output when the initial state is the kneader mode is the second
The gate of the NoTL circuit 42 is closed, and the low level inverted output signal N3 of the mode signal M is
Ol(, opens the circuit 4o. Therefore, the first N
Only when the normal switch 2 that supplies the switch signal 8wP+ to the OR circuit 40 is operated, the fourth N OIt
The circuit 46 outputs a mode control signal MCP to switch the fader mode to normal mode.

In the embodiment configured as described above, when the normal switch 2 is operated, the mode controller 31 operates in the normal mode and an external control signal is output from the external control signal output terminal 6, and when the fader switch 3 is operated, the mode controller 31 operates in the normal mode. Since it works in the fader mode and an external control signal is output from the external control signal output terminal 6, it is possible to designate any operation mode and perform continuous shooting by operating the above-mentioned switches 2 and 3 provided on the video camera 1. can.

That is, for example, when you first operate the normal switch, the video camera is set to the operating mode or normal mode, and at the same time the external control signal (start signal) is set to V.
Supplied to TR. Therefore, by operating the normal switch, photographing is started in the normal mode. Next, when the fader switch is operated, the operating mode of the video camera is set to fader mode, and at the same time, an external control signal (stop signal) is supplied to the VTR.

Therefore, at this time, the one-cut shooting ends with a fade-out. Further, when the fader switch is operated, photographing starts in fader mode, that is, it fades in, and then when the normal switch is operated, photographing ends in normal mode.

As mentioned above, according to the above-mentioned embodiment, continuous shooting in which fader mode and normal mode are arbitrarily combined is possible in 71-
This can be done extremely easily by selecting two switches: the cross-over switch and the fader switch.

〔Effect of the invention〕

As is clear from the above description, the present invention adopts the configuration of a normal start-stop switch, so that when shooting in fader mode, that is, when performing fade-in and fade-out, the above-mentioned fader All you have to do is operate the start/stop switch, and the operability can be greatly improved.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a video camera and video tape recorder to which the present invention is applied, FIG. 2 is a block diagram showing the internal configuration of the video camera in FIG. 1, and FIG. 3 is a logic diagram showing an embodiment of the present invention. It is a circuit diagram. 1...Video camera 2...Normal start/stop switch 3...Fader start/stop switch Patent applicant Sony Corporation representative Patent attorney Kodo Koike 1) Sakae Mura -

Claims (1)

[Claims] In a video camera equipped with a fader circuit whose operation is controlled by mode controllers 1 to 0-, a switch for commanding normal mode operation of the mode controller and a switch for commanding fader mode operation are provided, and
A control circuit for a video camera, characterized in that a logical sum output of command signals from each of the switches described above is output as an external control signal.