JPH11234541A - Income system for tv camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the income system where a sound is heard by a headset in volume compatible with environment noise by automatically increasing the sound volume from a speaker of the headset when the environment noise eve is high and decreasing the sound volume from the speaker of the headset when environment noise level is low. SOLUTION: The system is provided with a rectifier circuit 14 that rectifies and detects sound signals picked up by a microphone 15-2 of the operator headset 15 of a TV camera, and a monitor amplifier 11 that controls the sound level reproduced from a speaker 15-1 of the operator headset 15 of the TV camera according to the sound level detected by the rectifier circuit 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intercom device for a TV camera, and more particularly to a T-camera which reduces the influence of ambient noise.
The present invention relates to an intercom device for a V camera.

[0002]

2. Description of the Related Art In a broadcast TV camera, a cameraman controls an angle, a zoom, an aperture, and the like of a camera during shooting according to an instruction from a camera control unit. When an instruction or information (intercom) about such shooting is transmitted from a camera control unit to a cameraman, the TV
The camera and the camera control unit are connected to each other, and the cable for transmitting the video signal is provided with an up / down audio line, an intercom signal is superimposed on this line and transmitted, and the cameraman inserts a headset into the TV camera, Intercom voice communication was exchanged using a set.

FIG. 1 is an external view of a TV camera and a conventional TV camera intercom device connected to the TV camera. Headset 7 on camera control unit (CCU) 5 side
Signal from the microphone of the TV camera 1 via the line provided in the cable 4 for transmitting the video signal via the CCU 5 once to the camera adapter (C
A) The signal is input to 3 and transmitted to the speaker of the cameraman's headset 6 connected to the connector provided therein to be reproduced. Similarly, the audio signal input from the microphone from the cameraman's headset 6 is transmitted to the speaker of the headset 7 on the side of the CCU 5 along the reverse path and reproduced.

FIG. 4 shows a circuit configuration around a headset 6 for a cameraman of a conventional TV camera intercom apparatus. In FIG. 4, reference numeral 21 denotes a monitor amplifier for amplifying an intercom signal from the CCU side; 22, a manual adjustment volume for adjusting the gain of the monitor amplifier; 25, a headset; 25-1, a headset speaker; Reference numeral -2 denotes a headset microphone, and reference numeral 26 denotes a microphone output amplifier.

[0005] Incidentally, TV cameras are used in various environments. For example, it is often used in a concert hall or a place such as an F1 race where the surrounding environmental noise is relatively large and its noise level changes continuously. In such a case, conventionally, the microphone 25-2
Irrespective of the volume from the speaker, when the surrounding environmental noise is loud and busy, the volume of the speaker 25-1 of the headset 25 is adjusted manually by adjusting the adjustment volume 22, and when the surrounding is quiet, the speaker 25-1 is turned up. Was manually adjusted by adjusting the adjustment volume 22.

However, it is troublesome to manually adjust the volume of the speaker 25-1 one by one, and there is a problem that the user frequently uses the speaker 25-1 in an unfavorable state with the volume increased. On the other hand, when the surrounding environmental noise is loud, one's own utterance naturally increases, and the input level from the microphone 25-2 increases, and the speaker of the headset 7 on the CCU 5 side is more than necessary. Often heard at a loud volume.

[0007]

As described above, in the conventional TV camera intercom apparatus, the volume of the speaker of the cameraman's headset is manually adjusted, so that the adjustment suitable for the ambient environmental noise is troublesome. However, there is a problem in that the user can easily use the device at a loud volume without necessitating proper adjustment according to the ambient environmental noise. Also, when the ambient environmental noise is loud, the utterance tends to be loud, and there is a problem that an excessive volume is sent to the other party.

The present invention solves this problem, and automatically increases the volume from the speaker when the environmental noise is large, and automatically increases the volume from the speaker when the environmental noise is small in a relatively simple manner. An object of the present invention is to realize an intercom device for a TV camera capable of listening to a headset at a volume suitable for environmental noise by reducing the size.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a telephone conversation between a TV camera console and a TV camera operator who operates a TV camera in accordance with instructions from the TV camera console. In the intercom device for a TV camera to be performed, a transmission volume detection unit for detecting a volume input from a transmission unit used by the TV camera operator, and the TV camera operator according to the volume detected by the transmission volume detection unit. And a receiving sound volume control means for controlling a sound volume reproduced from the receiving means used by the receiving means.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an intercom device for a TV camera according to the present invention. FIG. 1 shows a configuration diagram of a TV camera, a camera control unit, and an intercom device for a TV camera such as a handset connected to the TV camera, to which the present invention is applied. Although FIG. 1 has been briefly described in the prior art, the basic configuration is the same in the present invention, so that it is repeated here.

In FIG. 1, 1 is a TV camera, 2 is a camera head unit (CHU), 3 is a camera adapter (C
A), 4 is a cable connecting the TV camera 1 and the camera control unit (CCU), 5 is a camera control unit (CCU), 6 is a cameraman's headset,
Reference numeral 7 denotes a headset on the CCU 5 side.

FIG. 2 shows a circuit configuration around a photographer's headset 6 in an embodiment of the intercom apparatus according to the present invention. In FIG. 2, reference numeral 11 denotes a monitor amplifier for amplifying an income signal from the CCU side, 12 denotes a manual gain adjustment volume for adjusting the gain of the monitor amplifier, 1
3 is an adder, 14 is a rectifier for rectifying the amplified microphone output, 15 is a headset, 15-1 is a headset speaker, 15-2 is a headset microphone, 16 is a microphone output amplifier, and 17 is a CCU. An input terminal 18 for the intercom signal from the side, and an output terminal 18 for the microphone signal.

The operation of the apparatus will be described with reference to FIGS. A cameraman on the TV camera 1 side adjusts the shooting direction, zoom, aperture, and the like of the TV camera 1 according to an instruction from the director on the camera control unit 5 side. Voice instructions and conversations from the director are available at the CCU.
Input to the microphone of the headset 7 on the
Via U5, the video is sent from the TV camera 1 to the CCU 5 via the audio line connected to the cable 4 and sent to the TV camera 1 via the speaker of the cameraman's headset 6 connected to the camera adapter 3 of the TV camera 1. Is output.

The monitor amplifier 11 shown in FIG. 2 is provided, for example, in the camera adapter 3. The intercom signal from the director coming from the CCU 5 is amplified by the monitor amplifier 11, and the headset 6 on the cameraman side is amplified.
It is output from the speaker 15-1 of (15). On the other hand, a reply or conversation from the cameraman is converted into an electric signal by the microphone 15-2 of the headset 6 (15) on the cameraman side, and is amplified by, for example, a microphone output amplifier 16 provided in the camera adapter 3. Is transmitted from the microphone output terminal 18 to the CCU 5 via the TV camera 1 and the cable 4, and is reproduced by the speaker of the headset 7 on the CCU 5 side.

By the way, when the environmental noise on the TV camera 1 side is loud, it becomes difficult for the cameraman to hear audio signals such as instructions from the director. Therefore, speaker 1
It is desirable to increase the volume from 5-1. In order to cope with this, in the present embodiment, the gain of the monitor amplifier 11 is increased by using the environmental noise taken from the microphone 15-2 to increase the volume from the speaker 15-1. That is, the output of the microphone output amplifier 16 is rectified by the rectifier circuit 14 to detect the level thereof, and the level signal and the output of the adjustment volume 12 are added by the adder 13. Control the gain.

When the environmental noise or the photographer's own utterance is loud, the volume of the intercom from the speaker 15-1 automatically increases. Conversely, when the environmental noise is low, the volume from the speaker 15-1 decreases. The volume is automatically controlled in the desired direction, so that the volume is always easy to hear regardless of the level of the environmental noise.

FIG. 3 shows a circuit configuration around a headset 6 for a photographer in another embodiment of the intercom device of the present invention. In this circuit, a variable attenuator 19 whose attenuation is varied by the output of the rectifier circuit 14 is inserted into the output of the microphone output amplifier 16 so that the output is attenuated when the output of the rectifier circuit 14 is large. In this way, it is possible to prevent the photographer's own utterance from increasing when the environmental noise is loud, so that an unnecessarily large volume is output from the speaker of the headphone on the CCU 5 side.

Instead of providing the variable attenuator 19, the output of the rectifier circuit 14 is negatively fed back to the microphone output amplifier 16 so that the microphone output amplifier 16
The same holds true for lowering the gain of.

By the way, the user who uses the feedback operation of the received sound volume against the environmental noise inevitably has a preference. Some photographers will find that it is desirable for the received sound volume to change significantly with changes in the environmental noise level, and some photographers will want to receive the sound at a constant volume regardless of the environmental noise level. In order to cope with such a user's preference, an attenuator is provided between the output of the rectifier circuit 14 and the adder 13, and the amount of attenuation of the attenuator is adjusted. By changing the ratio of the gain adjustment effect of the monitor amplifier 11 in this way, this can be realized.

[0020]

As described above, according to the first aspect of the present invention, a telephone call is made between a TV camera console and a TV camera operator who operates the TV camera in accordance with instructions from the TV camera console. In the TV camera intercom apparatus, a transmission volume detection unit that detects a volume input from a transmission unit used by a TV camera operator, and a TV camera operator uses the transmission volume detection unit according to the volume detected by the transmission volume detection unit. And receiving sound volume control means for controlling a sound volume reproduced from the receiving means. Thus, in a relatively simple manner, the sound volume from the speaker is automatically increased when the environmental noise is high, and the sound volume from the speaker is reduced when the environmental noise is low. T to hear the headset at the volume
An intercom device for a V camera can be realized.

According to a second aspect of the present invention, there is provided a transmitter for controlling a sound volume inputted from a transmitting means used by a TV camera operator in accordance with a sound volume detected by a transmitting sound volume detecting means in the intercom device for a TV camera. It is characterized by having a speech volume control means. This enables a relatively simple method to automatically reduce the volume from the speaker when environmental noise or utterance is loud, so that the volume of the TV camera is not sent to an opponent more than necessary. Intercom device can be realized.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an intercom device for a TV camera in which the present invention is used.

FIG. 2 is a block diagram showing a circuit configuration around a headset in the embodiment of the income device of the present invention.

FIG. 3 is a block diagram showing a circuit configuration around a headset in another embodiment of the intercom device of the present invention.

FIG. 4 is a block diagram showing a circuit configuration around a headset of a conventional intercom device.

[Explanation of symbols]

1: TV camera, 2: Camera head unit (CH
U), 3 ... Camera adapter (CA), 4 ... Cable, 5
... Camera control unit (CCU), 6 ... Headset for photographer, 7 ... Headset for CCU,
11: monitor amplifier, 12: gain adjustment volume, 13
... Adder, 14 ... Rectifier, 15 ... Headset, 15-
Reference Signs List 1 speaker, 15-2 microphone, 16 output amplifier, 17 input signal input terminal, 18 microphone signal output terminal, 19 variable attenuator, 21 monitor amplifier, 22 adjustment volume, 25 head Set, 25
-1 speaker, 25-2 microphone, 26 output amplifier.

Claims (2)

[Claims] 1. An intercom device for making a call between a TV camera console and a TV camera operator operating a TV camera in accordance with an instruction from the TV camera console, wherein a transmitting means used by the TV camera operator. Transmission volume detection means for detecting the volume input from the receiver, and reception volume control means for controlling the volume reproduced from the reception means used by the TV camera operator according to the volume detected by the transmission volume detection means. An intercom device for a TV camera, comprising: 2. A transmission volume control unit for controlling a volume input from the transmission unit used by the TV camera operator according to a volume detected by the transmission volume detection unit. Item 2. An intercom device for a TV camera according to item 1.