JPH0482383A - tv camera - Google Patents

Abstract

PURPOSE:To preclude the possibility of unexpected transmission of a voice signal by an intercom microphone by discriminating whether a camera control unit is in the connection state or in the non-connection state so as to apply switching control. CONSTITUTION:When a camera control unit 22 is connected to a CCU connection terminal 11 and used, since a changeover switch 3 selects automatically a 1st control signal of a 1st control signal generating section 1, an amplifier 5 is switched into the operating state and the inoperating state by manual switching control of a remote control switch 6A. Then the voice signal by an intercom microphone 21 is fed to the camera control unit 22 when the remote control switch 6A is closed and when the remote control unit 6A is opened, the voice signal by the intercom microphone 21 is not outputted externally.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a television camera to which a camera control unit and an intercom microphone can be connected.

B. PRIOR TECHNOLOGY In general, in a television camera in which a camera control unit is externally connected, for example, as shown in FIG. Cam microphone (
21) to enable voice communication between the operator of the camera control unit (22) externally connected to this television camera (20) and the operator of the television camera (20), that is, the cameraman. It looks like this. The television camera (20) also has a video tape recorder (23) connected to the television camera (20) that remotely controls the start/end of a recording operation in order to record the image output video signal. A remote control switch (24) is provided for this purpose.

In the conventional television camera (20) to which the intercom microphone (21) and camera control unit (22) can be connected in this way, the remote control switch (24) is connected to the trigger terminal as shown in FIG. A flip-flop 7 block (25) connected to the remote control switch (24) forms a control signal whose polarity is reversed each time the remote control switch (24) is operated, and this control signal is sent to the video tape recorder (23).
), and also controls the operation of an amplifier (26) that amplifies and outputs the audio signal from the intercom microphone (21).

C Problems to be Solved by the Invention By the way, as mentioned above, the video tape recorder (2)
In the conventional television camera (20), the operation of the amplifier (26) that amplifies and outputs the audio signal from the intercom microphone (21) is controlled by the control signal for remote operation control (3). Intercom microphone (21
), it became unclear whether the audio signal output system was currently on or off, and the audio was often transmitted inadvertently.

Therefore, in view of the actual situation of conventional television cameras as described above, the present invention is a television camera to which a camera control unit and an intercom microphone can be connected, and which is designed to prevent vibrations in which audio signals from the intercom microphone are inadvertently transmitted. This provides a television camera that is free from distortion.

D. Means for Solving the Problems The present invention provides a television camera to which a camera control unit and an intercom microphone can be connected, and which determines whether the camera control unit is in a connected state or in a disconnected state. a first control signal generating means for generating a first control signal by opening and closing a switch;
The second control signal whose polarity is reversed each time the control signal becomes one polarity.
Switching is controlled by a second control l signal generating means for generating a control signal, and a discrimination output from the discrimination means, and in the connected state, the first siI control signal is selected, and in the disconnected state, the second control signal is selected. Control! A signal switching means for selecting a signal and the first or second control signal selected by the switching means are controlled into an activated state and an inactive state, and in the activated state, the audio signal from the intercom microphone is amplified. The apparatus is characterized in that it includes an amplifying means for outputting, and a control signal output terminal for outputting the first or second control signal selected by the switching means to the outside.

E. Effect In the television camera according to the present invention, the first control signal generating means generates the first control signal by opening and closing the switch. Further, the second control signal generating means generates a second control signal whose polarity is inverted each time the first control signal generated by the first control signal generating means has one polarity.

Then, the determining means determines whether the camera control unit is in a connected state or in a non-connected state, and the signal switching means is controlled to switch based on the determined output. As a result, the signal switching means selects the first control signal in a connected state where the camera control unit is connected, and selects the second control signal in a disconnected state where the camera control unit is not connected. According to the first or second control signal selected by the switching means, the amplification means for amplifying and outputting the audio signal from the intercom microphone is controlled into an active state and a non-active state.

Further, the first or second control signal selected by the switching means is outputted from the control signal output terminal to the outside.

F. Embodiment Hereinafter, embodiments of the television camera according to the present invention will be described in detail with reference to the drawings.

For example, as shown in FIG. 1, the television camera according to the present invention includes first and second control signal generating sections (1).

(2), these first and second control signal generators (1) (
2), a signal changeover switch (3) that selectively outputs the first control signal and the second control signal generated by the unit, a determination processing unit (4) that determines the connection state of the camera control unit, and an intercom microphone. The device includes an amplifier (5) that amplifies and outputs the audio signal generated by the audio signal.

The television camera (10) shown in FIG. 1 is the same as the conventional television camera (20) shown in FIG. 2 to which the conventional intercom microphone (21) and camera control unit (22) can be connected. is applied, and the camera head (HEAD) such as the imaging unit and this camera head (
It consists of a camera adapter (CA) that has a built-in interface with an external device (HEAD) and an external device.

and the first and second control signal generating sections (1),
(2) and the signal changeover switch (3) are provided in the camera head (HEAD), and the discrimination processing section (4) and the amplifier (5) are provided in the camera adapter (CA).

In the video camera (lO) of this embodiment, the first
The control signal generator (1) includes a resistor (6B) connected between the power terminal (+V) and the ground, and a remote control switch (6A).
) consists of a series connection circuit. This first control signal generating section (1) generates a first control signal in response to opening/closing of the remote control switch (6A).

That is, this first control signal generating section (1) has a logic "H" when the remote control switch (6A) is opened.
Then, with the remote control switch (6A) closed, a first control signal that becomes logic "L" is generated.

The remote control switch (6A) is disposed on the camera head body, the imaging lens barrel, etc. so as to be manually operable.

Further, the second control signal generating section (2) is constituted by a flip-flop (7) whose trigger input terminal is supplied with the first control signal generated by the first control signal generating section (1). be done. This second control signal generator (2) generates a second signal whose polarity is inverted every time the remote control switch (6^) is closed, that is, every time the first control signal becomes logic "L". Outputs a control signal.

Here, the camera head (HEAD) constituting this video camera (10) is provided with a control section (8) that controls the operation of an image pickup section and a video signal processing section (not shown) using a microcomputer. .

The signal changeover switch (3) is connected to the discrimination processing section (4) provided in the camera adapter (CA).
The switching control is performed by the control section (8) based on the discrimination output of the first and second control signal generation sections (1).
, (2) and selectively outputs the first control signal and the second control signal generated by switching.

Further, the above-mentioned discrimination processing section (4)
It is composed of a microcomputer that decodes control data that is serially transmitted, for example, from a camera control unit (22) connected to a CCU connection terminal (11) provided in the camera control unit (CA). Then, this discrimination processing unit (
4) determines whether or not there is control data serially transmitted from the camera control unit (22) to the CCU connection terminal (11).
Connect the camera control unit (22) to the connection terminal (11).
) is in a connected state or in an unconnected state, and the output of the determination is given to the control unit (8) on the camera head (HE^port) side together with the decoding output of the control data.

The control section (8) on the camera head (HEAD) side controls an imaging section (not shown) and a video signal processing section (not shown) based on the decoding output of the control data given by the discrimination processing section (4) on the camera adapter (CA) side. It also controls the switching of the signal changeover switch (3) based on the discrimination output of the discrimination processing section (4).

In addition, in this TV camera (10), the control unit (8) sets the sensitivity using the sensitivity setting switch (9) in a disconnected state where the camera control unit (22) is not connected to the CCU connection terminal (11). A receiver is attached to control the sensitivity switching of the imaging section.

The signal changeover switch (3), which is switched and controlled by the control unit (8) based on the discrimination output of the discrimination processing unit (4), has a camera control unit (22) connected to the CCU connection terminal (11). In the connected state, the first control signal generator (1) generates the first control signal.
and select the control signal of ccUt'! Connection terminal (
In the disconnected state where the camera control unit (22) is not connected to the camera control unit (22), the second control signal generator (
Select the second control signal according to 2). The first control signal and the second control signal selectively output through the signal changeover switch (3) control the amplifier (5) provided in the camera adapter (CA). Input terminal and control output terminal (12)
output to the outside via.

The control output terminal (12) is connected to this television camera (1
A control input terminal of a video camera (23) that records the imaging output signal obtained by 0) is externally connected.

The amplifier (5) also includes an intercom microphone (21).
) is externally connected to the intercom microphone input terminal (13
) and an intercom microphone output terminal (14) to which the intercom microphone input terminal of the camera control unit (22) is externally connected. The amplifier (5) is controlled to switch between an operating state and a non-operating state by the first control signal or the second control signal selectively outputted via the signal changeover switch (3), and When the signal is logic r L J, it is activated and the audio signal from the intercom microphone (21) is amplified and output from the intercom microphone output terminal (14).

In the television camera (10) having such a configuration, the CC
Connect the camera control unit (2) to the U connection terminal (11).
2), the changeover switch (3) automatically selects the first control signal generated by the first control signal generation section (1), so that the first control signal generation section (1) does not generate the first control signal. The remote control switch (6) constituting part (1)
The amplifier (5) can be switched between an active state and a non-active state by the manual opening/closing operation of A). The audio signal from the intercom microphone (21) is sent to the camera control unit (22) when the remote control switch (6A) is closed;
When the remote control switch (6^) is open, the audio signal from the intercom microphone (21) is not output to the outside.

Therefore, when the cameraman of the television camera (10) connects the camera control unit (22) to the ccU connection terminal (11) and uses the camera control unit, the cameraman transmits the audio signal from the intercom microphone (21) to the camera control unit. (22) can be sent to the operator. Since the amplifier (5) is activated in conjunction with the closing operation of the remote control switch (6A), the cameraman can always recognize whether or not an audio signal is being output. There is no possibility that the audio signal from the intercom microphone (21) is accidentally transmitted.

In addition, when this television camera (10) is used without connecting the camera control unit (22) to the CCU connection terminal (11), the changeover switch (3)
) automatically selects the second control signal from the second control signal generation section (1), so the remote control switch (6A) constituting the first control signal generation section (1)
The second control signal whose polarity is inverted each time the closing operation is performed can be outputted from the control signal output terminal (12). The second control signal output from the control signal output terminal (12) is transmitted to the television camera (10) in order to record the imaging output video signal of the television camera (10).
This signal is used as a remote control signal for remotely controlling the start/end of a recording operation by a video tape recorder (not shown) connected to a video tape recorder (not shown).

Therefore, the cameraman must use the remote control switch (6A)
The video tape recorder can be remotely controlled by manually operating a so-called push-button switch.

G. Effects of the Invention As described above, in the television camera according to the present invention, the determining means determines whether the camera control unit is in the connected state or in the disconnected state, and the signal switching means uses the determined output. In the connected state where the camera control unit is connected, the signal switching means selects the first control signal generated by the first control signal generating means by opening and closing the switch, and the intercom Since the amplifying means for amplifying and outputting the audio signal from the microphone is controlled between an activated state and an inactive state by the first control signal, the transmission state of the audio signal from the intercom microphone is switched by opening and closing the switch. Therefore, there is no chance that the audio signal from the intercom microphone will be transmitted inadvertently.

Further, in a disconnected state in which the camera control unit is not connected, a second control signal generated by a second control signal generator in response to a first control signal by the first control signal generating means is generated. is selected by the signal switching means, so that the second control signal whose polarity is inverted each time the first control signal becomes one polarity can be outputted to the outside from the control signal output terminal. Thereby, the external device can be remotely controlled by opening and closing the switch.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the main configuration of a television camera according to the present invention. FIG. 2 is a block diagram showing the system configuration of an imaging system using a general television camera to which a camera control unit and an intercom microphone can be connected. FIG. 3 is a block diagram showing a conventional configuration of a control system for a signal line of an intercom microphone in a television camera to which a conventional camera control unit and an intercom microphone can be connected. (1)・・・・・・・・・・・・ (2)・・・・・・・・・・ (3)・・・・・・・・・・ (4)・・・・・・・・・・・・・ （５）・・・・・・・・・ （６＾）・・・・・・・・・ （１０）・・・・・・・・・ （１１）・・・・・・・−・・（12）・・・・・・・・・・ (13)・・・・・・・・・・ (13)・・・・・・・・ First control signal generation Section Second control signal generation section Signal changeover switch Discrimination processing section Amplifier Remote control switch Television camera CCU connection terminal Control signal output terminal Intercom microphone input terminal Intercom microphone output terminal

Claims (1)

[Claims] A television camera to which a camera control unit and an intercom microphone can be connected, comprising: a determining means for determining whether the camera control unit is in a connected state or in a disconnected state, and a switch; a first control signal generating means that generates a first control signal by opening and closing the first control signal; and a second control whose polarity is reversed each time the first control signal generated by the first control signal generating means becomes one polarity. Switching is controlled by a second control signal generation means for generating a signal and a discrimination output from the discrimination means, and the first control signal is selected in the connected state, and the second control signal is selected in the disconnected state. It is controlled into an activated state and a non-activated state by a signal switching means to select, and the first or second control signal selected by this switching means, and amplifies and outputs the audio signal from the intercom microphone in the activated state. A television camera comprising an amplifying means and a control signal output terminal for outputting the first or second control signal selected by the switching means to the outside.