JP2999899B2 - Video camera - Google Patents

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 including a speaker and a display unit is detachably mounted on a video camera body integrally including a microphone.

[0002]

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

In the video camera disclosed in the above-mentioned known document, not only is the liquid crystal monitor used for confirming the photographing state in a photographing mode, that is, a recording mode, but also in a reproducing mode after photographing, and a video signal recorded in a VTR section is recorded. Display, and then place the speaker on the LCD monitor,
By making the sound of the audio signal recorded together with the video signal sound with this speaker, the video and the audio can be viewed.

[0004]

As described in the prior art, when a speaker-integrated liquid crystal monitor is mounted on a video camera body, the microphone of the video camera body and the speaker come close to each other. The collected sound is output by the speaker of the LCD monitor, and the sound is collected again by the microphone, and a closed loop is formed to cause howling, which may cause the sound to be recorded together with the sound desired to be recorded at the time of shooting. .

[0005]

According to the present invention, there is provided a recording method for recording an audio signal obtained by sound pickup of a 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 detachable from the video camera body, a mounting detection unit for detecting whether the speaker unit is mounted on the video camera main unit, and a speaker unit mounted by the mounting detection unit. When the recording mode is detected, the recording mode is provided with a mute unit for preventing the supply of the audio signal from the microphone to the speaker unit, and at the time of reproduction, allowing the supply of the audio signal from the recording / reproducing unit to the speaker unit. It is characterized.

[0006]

Since the present invention is constructed as described above, the audio signal from the speaker section is muted during recording to prevent the occurrence of howling, and the mute is released during reproduction.
You can listen to the recorded voice.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a main circuit block diagram of a VTR-integrated video camera of this embodiment. 1 is an imaging unit 2,
This is a video camera main body including a microphone 3, a VTR unit 4, and the like. Here, the configuration of the video camera body will be described. An audio signal from the microphone 3 picked up during shooting is amplified by the amplifier 5 and output to the fixed contact 6 a of the switch 6.

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

The image pickup section 2 has a solid-state image pickup device (CCD) and an image pickup circuit. The image of the subject formed on the CCD is photoelectrically converted, signal-processed by the image pickup circuit, and a video signal is output. .

The VTR unit 4 receives an audio signal output from the switch 6 and a video signal obtained from the imaging unit 2 as inputs.
As is well known, a luminance signal in a video signal is FM-modulated, a color signal in the video signal is also frequency-converted, and an audio signal is FM-modulated.
The data is modulated, frequency-multiplexed, and output to the fixed contact 8a of the switch 8.

The switch 8 is controlled to be switched by a mode signal similarly to the switch 6, and in the recording mode, the fixed contact 8 is switched.
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 from the magnetic tape 13 by the magnetic head 9 is input to the reproduction circuit 14, and the signal processing reverse to that of the recording circuit 7, i. The audio signal is FM-demodulated, the color signal is frequency-converted, and the original video and audio signal is restored. The video signal thus reproduced is supplied to the switch 3
9 and 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 imaging unit 2 is applied in a recording mode, and to a fixed contact 39b in a reproduction mode.

As described above, the switch 6 switches to the fixed contact 6a in the recording mode and to the fixed contact 6b in the reproduction mode.
An audio signal from the microphone 3 is supplied to the earphone terminal 11 and the mute circuit 12 in the recording mode, and an audio signal reproduced by the VTR unit 4 in the reproduction mode.

The mute circuit 12 includes the monitor unit 3
The mute circuit 12 selectively mutes the input audio signal by a mounting detection signal S1 from a mounting detection circuit for detecting the mounting state of the video camera body 1 to a video camera body 1 and a mode signal from a system controller. Output terminal 20b
Supplied to

The monitor unit 30 includes the liquid crystal monitor 3
1 and a speaker 32 integrally, and a liquid crystal monitor 31
A video signal input from the input terminal 33a is projected, and an audio signal input from the input terminal 33b and amplified by a predetermined amount by the volume 34 and the amplifier 35 is supplied to the speaker 32 to output audio. You. Here, the input terminals 33a and 33b are connected to the output terminals 20a and 20b of the video camera body 1 by a cable 40, respectively, and this connection state is maintained irrespective of the mounting state of the monitor unit 30 to the video camera body 1. Is done.

At the lower part of the monitor unit 30, a mounting engagement portion 36 is fixed, 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. A storage portion 37 in which the portion 36 is engaged and stored is fixed, and a metal piece 37a is fixed to the upper surface of the storage portion 37.

The metal piece 36a is connected to a power supply voltage line,
The metal piece 37a is grounded via a resistor R and connected to the mute circuit 12, and as shown in FIG.
The monitor unit 30 is mounted on the video camera main body 1 by sliding the mounting engaging portion 36 in the direction of the arrow to engage with the metal pieces 36a and 37a. An H (high) level signal is applied to the mute circuit 12 as the attachment detection signal S1. Conversely, when the monitor unit 30 is not mounted on the video camera body 1, the two metal pieces 36a, 37
Since a does not touch, the mute circuit 12 has L
The (b) level signal is applied as the attachment detection signal S1.

The mute operation of the mute circuit 12 will be described in detail. A mode signal indicating a recording mode is applied when the attachment detection signal S1 is at the H level, that is, when the monitor unit 30 is attached to the video camera body 1. Then, the mute circuit 12 executes the mute operation, prevents the input audio signal from passing 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 attachment detection signal S1 is at the L level, that is, when the monitor unit 30 is not attached to the video camera body 1, the mute circuit is provided regardless of whether the mode signal indicates the recording or reproduction mode. 12 does not operate and the mute operation is not performed.

With the above-described configuration, when the video camera body 1 is set to the recording mode and the subject is photographed while the monitor unit 30 is mounted on the video camera body 1, the video signal from the image pickup unit 2 becomes magnetic. While being recorded on the tape 13, the video signal is supplied to the liquid crystal monitor 31 via the switch 39 and projected, so that the recording state of the video signal can be confirmed. Further, the audio signal from the microphone 3 is supplied to the mute circuit 12, but the mute operation is executed and no audio is output from the speaker 32. Here, since no sound is output, it is impossible to check the recorded sound.
When photographing is performed by attaching to the microphone, the photographer operates the video camera at a position close to the video camera body.
The photographer can directly listen to the sound that is almost the same as the sound collected at, so there is no need to check the recorded sound,
The mute operation does not adversely affect shooting.

Next, when the reproducing mode is set while maintaining the above-mentioned 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 reproduced 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 a reproduced sound is emitted. In this way, it is possible to view the playback screen and the playback audio on the monitor unit 30.

Next, when the monitor unit 30 is detached from the video camera body 1 and the recording mode is set, the mounting detection signal S1 becomes L level, and the mute circuit 12 does not operate regardless of the mode and does not perform the mute operation. Therefore,
In this state, if you set the recording mode to shoot the subject,
As shown in FIG.
, The audio signal passes through the mute circuit 12, reaches the speaker 32, emits audio, and allows the user to confirm the video and audio being captured at a location away from the video camera body 1.

When the monitor unit 30 is detached from the video camera main body 1 and the monitor unit 30 is used as an open view finder at a location away from the video camera main body 1 as described above, the speaker 32 does not approach the microphone 3. So the mute circuit 12
When no is operated, no howling occurs. By not performing the mute operation, it is possible to confirm the audio signal recorded on the magnetic tape 13 even at a place away from the video camera main body 1, and the photographer can use the microphone 3
This is extremely effective when the user is in a distant place where the user cannot directly hear the collected sound.

When the reproduction mode is executed when the monitor unit 30 is 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. It is output to the speaker 32 without any processing.

When the monitor unit 31 is detached from the mounted state of FIG. 1 as shown in FIG. 3 and used at a place away from the video camera main body 1, video and audio signals between the monitor unit 30 and the video camera main body 1 are removed. The cable 40 for transmission is accommodated in the monitor unit 30 so that it can be extended 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.
Are provided with operation switches for recording, recording pause, reproduction, etc., and also function 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. 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 if the recording mode is executed after the unit having the speaker is mounted on the camera body, the audio signal to the speaker is muted, and the speaker emits sound. Never
Howling is prevented from occurring. During reproduction, the mute is released, and the reproduced audio signal can be heard on the speaker.

[Brief description of the drawings]

FIG. 1 is a main part circuit block diagram of one embodiment of the present invention.

FIG. 2 is an explanatory diagram when a monitor unit is mounted on the video camera body of one 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 a camera body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Video camera main body 3 Microphone 4 VTR part 32 Speaker 36a Metal piece 37a Metal piece 12 Mute circuit

Claims (1)

(57) [Claims] 1. A microphone mounted on a video camera main body, an audio signal obtained by sound pickup 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 / reproducing means, a speaker unit detachable from the video camera main body, mounting detection means for detecting whether the speaker unit is mounted on the video camera main body, When it is detected that the speaker unit is mounted, the supply of the audio signal from the microphone to the speaker unit is prevented in the recording mode, and the audio signal from the recording / reproducing unit to the speaker unit in the reproduction mode. A video camera provided with a mute unit that allows supply of a video signal.