JPH06253186A - Video camera - Google Patents

Abstract

PURPOSE:To prevent the generation of howling which is generated when a sound collected by a microphone is collected again in the microphone by mounting a monitor unit with a speaker and monitor are integrated on a video camera main body and executing photographing while a camera is in a recording mode with the microphone at the side of the camera and the speaker are closely located. CONSTITUTION:As a detection means detecting the loading state of a monitor unit 30 to a video camera main body 1, the monitor unit 30 and metal pieces 36a and 37a are arranged on the video camera main body 1. When a unit 30 is loaded, the metallic pieces 36a and 37a come into contact with each other and the loading state is detected. In this case, a mute circuit 12 inserted into a signal line supplying the sound signal collected by the microphone 3 to a speaker 32 is operated to prevent the supply of sound signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video camera in which a monitor unit integrally provided with a speaker and a display unit is detachably attached to a video camera main body integrally provided with a microphone.

[0002]

2. Description of the Related Art Conventionally, in a video camera integrated with a VTR, the photographer needs to look into a small viewfinder to check the shooting condition of the subject, and this checking operation is a troublesome operation. . As a remedy for this, as disclosed in pages 84 to 87 of the magazine "HIVI" (published on December 20, 1992, Stereo Sound Co., Ltd.), a relatively large liquid crystal monitor of about 4 inches is used as a video camera. And attach this monitor to the open view
A method for facilitating the confirmation work by using it as a finder has been proposed.

In the video camera disclosed in the above-mentioned publicly known material, the liquid crystal monitor is used not only for confirming the photographing state in the photographing mode, that is, in the recording mode, but also in the reproducing mode after the photographing, to the video signal recorded in the VTR section. Display, and further arrange the speaker on the LCD monitor,
By making the speaker produce sound by the audio signal recorded together with the video signal, the video and audio can be viewed.

[0004]

When the speaker-integrated liquid crystal monitor is mounted on the video camera body as in the prior art, the microphone of the video camera body and the speaker are close to each other, and the microphone is used at the time of shooting. The collected sound is output by the speaker of the LCD monitor, this sound is collected by the microphone again, a closed loop is formed, howling occurs, and there is a fear that it will be recorded together with the desired sound to be recorded at the time of shooting. .

[0005]

DISCLOSURE OF THE INVENTION The present invention is a recording for recording an audio signal obtained by picking up the microphone in a recording mode on a recording medium, and reproducing the audio signal recorded on the recording medium in a reproduction mode. A reproducing unit, a speaker unit that can be attached to and detached from the video camera body, a mounting detection unit that detects whether or not the speaker unit is mounted on the video camera body, and the speaker unit is mounted by the mounting detection unit. When it is detected that the audio signal is supplied from the microphone to the speaker section in the recording mode, the muting means is provided to allow the audio signal to be supplied from the recording / reproducing section to the speaker section during reproduction. Characterize

[0006]

Since the present invention is configured as described above, the audio signal from the speaker section is muted during recording to prevent howling from occurring, and is muted during playback.
The recorded voice can be heard.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit block diagram of essential parts of a VTR-integrated video camera of the apparatus of this embodiment. 1 is the imaging unit 2,
It is a video camera main body that incorporates a microphone 3, a VTR unit 4, and the like. Here, the configuration of the video camera body will be described. A voice signal from the microphone 3 picked up at the time of shooting is amplified by the amplifier 5 and output to the fixed contact 6 a of the switch 6.

The switch 6 is switch-controlled by a mode signal from a system controller (syscon) not shown, and switches to the fixed contact 6a side in the recording mode and to the fixed contact 6b side in the reproduction mode. The output stage of the switch 6 is connected to the recording circuit 7 of the VTR section 4, and the line-out terminal 10, earphone terminal 11 and mute circuit 1 are connected.
Connected to 2.

The image pickup section 2 has a solid-state image pickup element (CCD) and an image pickup circuit. The image of the object formed on the CCD is photoelectrically converted, and the image pickup circuit performs signal processing to output a video signal. .

The VTR section 4 receives the audio signal output from the switch 6 and the video signal obtained from the image pickup section 2, and
As is well known, a luminance signal in a video signal is FM-modulated, a color signal in the video signal is frequency-converted, and an audio signal is FM-converted.
The signals are modulated, frequency-multiplexed, and output to the fixed contact 8a of the switch 8.

Like the switch 6, the switch 8 is switch-controlled by a mode signal, and in the recording mode, the fixed contact 8 is used.
Switching to the a side, the output signal from the recording circuit 7 is supplied to the magnetic head 9 and recorded on the magnetic tape 13. In the reproduction mode, the switch 8 is switched to the fixed contact 8b, and the reproduction signal reproduced by the magnetic head 9 from the magnetic tape 13 is input to the reproduction circuit 14 to perform signal processing reverse to that of the recording circuit 7, that is, the luminance and The audio signal is FM-demodulated, the color signal is frequency-converted, and the original video and audio signals are restored. The video signal reproduced in this way is switched
9 is output to the fixed contact 39b, is output to the output terminal 20a via the switch 39, and the audio signal is output to the fixed contact 6b.
Is output to.

The switch 39 is controlled by a mode signal and is switched to a fixed contact 39a to which a video signal obtained from the image pickup section 2 is applied in the recording mode and to a fixed contact 39b in the reproduction mode.

As described above, the switch 6 is switched to the fixed contact 6a side in the recording mode and to the fixed contact 6b side in the reproduction mode, so that the line-out terminal 10,
The earphone terminal 11 and the mute circuit 12 are supplied with the audio signal from the microphone 3 in the recording mode and the audio signal reproduced by the VTR unit 4 in the reproduction mode.

The mute circuit 12 includes the monitor unit 3
The input detection signal S1 from the mounting detection circuit that detects the mounting state of 0 on the video camera body 1 and the mode signal from the system controller selectively mutes the input audio signal. Output terminal 20b
Is supplied to.

The monitor unit 30 is a liquid crystal monitor 3
1 and a speaker 32 are integrally provided, and an LCD monitor 31
The video signal input from the input terminal 33a is displayed on the monitor, and the speaker 32 is supplied with the audio signal input from the input terminal 33b and amplified by the volume 34 and the amplifier 35 by a predetermined amount to output audio. It Here, the input terminals 33a and 33b are respectively connected to the output terminals 20a and 20b on the video camera body 1 side by a cable 40, and this connection state is maintained regardless of the mounting state of the monitor unit 30 with the video camera body 1. To be done.

A mounting engagement portion 36 is fixed to the lower portion of the monitor unit 30, a metal piece 36a is fixed to the bottom surface of the engagement portion 36, and a mounting engagement portion is mounted on the upper surface of the cabinet of the video camera body. An accommodating portion 37 for engaging and accommodating the portion 36 is fixed, and a metal piece 37a is fixed to the upper surface of the accommodating portion 37.

The metal piece 36a is connected to the power supply voltage line,
The metal piece 37a is grounded via a resistor R and is connected to the mute circuit 12, and as shown in FIG.
By sliding the engaging portion 36 for mounting in the direction indicated by the arrow to engage the monitor unit 30, the monitor unit 30 is attached to the video camera main body 1. In this attachment completed state, the metal pieces 36a and 37a are in contact with each other. An H (high) level signal is applied to the mute circuit 12 as a mounting detection signal S1. On the contrary, when the monitor unit 30 is not attached to the video camera body 1, both metal pieces 36a, 37
Since a does not touch, the mute circuit 12 has L
A (low) level signal is applied as the mounting detection signal S1.

The mute operation of the mute circuit 12 will be described in detail. When the mounting detection signal S1 is at H level, that is, when the monitor unit 30 is mounted on the video camera body 1, a mode signal indicating the recording mode is applied. Then, the mute circuit 12 executes the mute operation, blocks passage of the input audio signal to the output terminal 20b at the subsequent stage, and stops the mute operation when the mode signal indicating the reproduction mode is applied.

When the mounting detection signal S1 is at L level, that is, when the monitor unit 30 is not mounted on the video camera body 1, the mute circuit irrespective of whether the mode signal indicates the recording or reproducing mode. 12 does not operate and mute operation is not performed.

With the above configuration, when the video camera body 1 is set in the recording mode and the subject is photographed while the monitor unit 30 is attached to the video camera body 1, the video signal from the image pickup section 2 is magnetic. At the same time as being recorded on the tape 13, the video signal is supplied to the liquid crystal monitor 31 via the switch 39 and is displayed so that the recording state of the video signal can be confirmed. Further, although the audio signal from the microphone 3 is supplied to the mute circuit 12, the mute operation is executed and no audio is output from the speaker-32. Here, since the sound is not output, it is impossible to confirm the recorded sound.
When shooting with the camera mounted on the microphone, the photographer operates the video camera at a position near the main body of the microphone.
Since the photographer can directly hear the sound that is almost the same as the sound that is picked up in, it is not necessary to check the recorded sound.
The mute operation does not adversely affect shooting.

Next, when the reproduction mode is set while maintaining the mounted state, the video signal reproduced from the magnetic tape 13 is supplied to the liquid crystal monitor 31 via the switch 39, and the reproduction screen is displayed. On the other hand, the reproduced audio signal is supplied to the mute circuit 12, but the mute circuit 12 does not operate.
2 and the reproduced voice is emitted. In this way, the playback screen and the playback audio can be viewed on the monitor unit 30.

Next, when the monitor unit 30 is detached from the video camera body 1 to enter the recording mode, the mounting detection signal S1 becomes L level, the mute circuit 12 does not operate regardless of the mode, and the mute operation is not performed. Therefore,
In this state, if you switch to the recording mode to shoot the subject,
As shown in FIG. 3, the video signal during shooting is displayed on the liquid crystal monitor 31.
Is displayed, the audio signal passes through the mute circuit 12 and reaches the speaker-32, and the audio is emitted, so that the image and the audio being taken can be confirmed at a place away from the video camera body 1.

When the monitor unit 30 is detached from the video camera body 1 and the monitor unit 30 is used as an open viewfinder at a place apart from the video camera body 1 as described above, the speaker 32 is not close to the microphone 3. Therefore, the mute circuit 12
Howling does not occur even if is deactivated. Further, by not performing the mute operation, it becomes possible to confirm the audio signal recorded on the magnetic tape 13 even in a place away from the video camera body 1, and the photographer can use the microphone 3
It is extremely effective when you are in a remote place where you cannot directly hear the collected sound.

When the reproducing mode is executed with the monitor unit 30 not mounted, the video signal is displayed on the liquid crystal monitor 31 and the audio signal is muted by the mute circuit 12 as in the mounted state. Without being output to the speaker-32.

When the monitor unit 31 is detached from the mounted state of FIG. 1 and used in a place away from the video camera body 1 as shown in FIG. 3, the video and audio signals between the monitor unit 30 and the video camera body 1 are changed. The cable 40 for transmission is housed in the monitor unit 30 so that it can be extended up to about 10 m, and when it is extremely separated, the cable 40 can be replaced with a longer cable.

Further, as shown in FIG. 3, the monitor unit 30
An operation switch for recording, recording pause, reproduction, etc. is provided in the, and also functions as a remote controller for controlling the operation of the video camera body 1. The video camera body 1 is also equipped with a normal viewfinder 41. Further, when the usage method as shown in FIG. 3 is adopted, the video camera body 1 is fixed on a tripod.

[0027]

As described above, according to the present invention, even when the unit having the speaker is mounted on the camera body and the recording mode is executed, the audio signal to the speaker is muted and the audio is emitted from the speaker. Never,
Howling is prevented from occurring. Further, the mute is released during reproduction, and the reproduced audio signal can be heard through the speaker.

[Brief description of drawings]

FIG. 1 is a block diagram of a main circuit according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram when mounting the monitor unit on the video camera main body according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram when the monitor unit according to the embodiment of the present invention is used while being separated from the camera body.

[Explanation of symbols]

 1 Video camera main body 3 Microphone 4 VTR section 32 Speaker 36a Metal piece 37a Metal piece 12 Mute circuit

Claims (1)

[Claims] 1. A microphone mounted on a video camera body, and an audio signal obtained by picking up sound of the microphone in a recording mode is recorded on a recording medium, and an audio signal recorded on the recording medium is reproduced in a reproduction mode. Recording / playback means, a speaker unit that can be attached to and detached from the video camera body, a mounting detection unit that detects whether the speaker unit is mounted on the video camera body, and the mounting detection unit When it is detected that the speaker unit is attached, the supply of the audio signal from the microphone to the speaker unit is blocked in the recording mode, and the audio signal from the recording / reproducing unit to the speaker unit is reproduced in the reproduction mode. A video camera provided with a mute means for allowing the supply of the.