JPH0591385A - Integrated video camera - Google Patents

Abstract

(57) [Abstract] [Purpose] VT included in the output audio signal of the microphone
To obtain a video-integrated camera that eliminates vibration noise from the R mechanical section and obtains a good S / N audio signal that does not include vibration noise. [Structure] A unit 4 for detecting only a vibration component applied to the microphone 1 is provided separately from the microphone 1 for picking up an audio signal, and an output signal of the unit 4 is subtracted by a subtractor 5
Is subtracted from the output signal of the microphone 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video-integrated camera, and more particularly to an audio signal recording system.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram of a microphone for collecting sound and its audio signal recording circuit in a conventional video-integrated camera. In the figure, 1 is a microphone for collecting sound, 2 is
Is an amplifier, and 3 is a VTR section.

Next, the operation will be described. The microphone 1 converts the collected sound into an electric signal, and the amplifier 2
The input audio signal is amplified and input to the VTR unit 3, and the audio signal is recorded on a video tape (not shown).

[0004]

Since the microphone and the audio recording circuit of the conventional video-integrated camera are configured as described above, the vibration of the drive mechanism of the VTR unit propagates to the microphone and is picked up. Since it is converted into an electric signal and recorded together with the voice, the S / N of the reproduced voice signal is lowered.

Further, in order to reduce the mixing of such vibration noise, an anti-vibration mechanism such as hanging the microphone with a rubber material is provided, which is an obstacle to downsizing and cost reduction.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a video-integrated camera capable of removing vibration noise contained in an audio signal without providing a vibration isolation mechanism. To aim.

[0007]

A video-integrated camera according to the present invention is a unit for detecting a vibration component for detecting only a vibration component applied to the microphone and converting it into an electric signal in addition to a microphone for collecting sound. And means for subtracting the output signal of the unit from the output signal of the microphone.

[0008]

The output signal of the unit according to the present invention becomes a signal having the same component as the vibration noise converted into an electric signal by vibrating the microphone. Therefore, a signal obtained by subtracting the output signal of the unit from the output signal of the microphone becomes an audio signal with good S / N that does not include vibration noise.

[0009]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 4 denotes a vibration component detecting unit, which is attached to, for example, the housing of the microphone 1 and detects only the vibration component propagating from the VTR section 3 or the like to the microphone 1 and converts it into an electric signal. 5 is a subtractor.

Next, the operation will be described. Unit 4
Detects a vibration component applied to the microphone 1 and converts it into an electric signal. The subtracter 5 subtracts the output signal of the unit 4 from the output signal of the microphone 1, outputs an audio signal containing no vibration noise to the amplifier 2, and the amplified audio signal is input to the VTR unit 3 and is recorded on a video tape. To be recorded.

Embodiment 2. In the first embodiment described above, the output signal of the unit 4 for detecting the vibration component is subtracted from the output signal of the microphone 1 as it is. However, in order to further increase the removal efficiency of the vibration component, the vibration component may be feedback-controlled. .. A block circuit diagram of this embodiment is shown in FIG. In the figure, 6 is a vibration noise inspection unit, 7 is a level adjusting unit, and 8 is a phase adjusting unit.

Next, the operation will be described. The output signal of the subtractor 5 is input to the vibration noise monitoring unit 6, and the level adjustment signal and the phase adjustment signal that minimize the vibration noise are sent to the level adjustment unit 7 and the phase adjustment unit 8 to output the output of the unit 4. After the signal level and phase are adjusted, the subtracter 5
And is subtracted from the output signal of the microphone 1.

Embodiment 3. In the third embodiment shown in FIG. 3, the signal processing system is a digital signal in order to simplify the operation of the control unit of the second embodiment. As shown in FIG. The A / D converter 10 converts the output signal of the unit 4 into digital data by the A / D converter 9.
Convert it into digital data, and perform level adjustment, phase adjustment and feedback control by digital signal,
The A / A converter 11 restores the original analog signal, and then inputs the audio signal to the VTR unit 3.

Example 4. The fourth embodiment shown in FIG. 4 is applied to a stereotype, and includes a microphone 1 and a subtractor 5
Further, a signal system constituted by the amplifier 2 and the left and right channels is provided, the unit 4 for vibration detection is shared for both channels, and its output signal is subtracted from the output signals of the left and right channels. Unit 4
May be provided for each channel.

[0015]

As described above, according to the present invention, a vibration detection unit for detecting the vibration applied to the sound collecting mycorophone and converting it into an electric signal is provided, and the unit detects the vibration from the output signal of the microphone. Since the vibration noise component is removed by subtracting the output signal, the vibration noise component can be removed from the audio signal picked up by the microphone, and an audio signal with good S / N can be obtained.

Further, since the mechanism for preventing vibration (for example, rubber suspension) which has been conventionally provided is not required, the structure can be simplified, and the size and cost can be reduced.

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a block circuit diagram showing a second embodiment of the present invention.

FIG. 3 is a block circuit diagram showing a third embodiment of the present invention.

FIG. 4 is a block circuit diagram showing a fourth embodiment of the present invention.

FIG. 5 is a block circuit diagram showing a configuration of a conventional technique.

[Explanation of symbols]

 1 Microphone for collecting sound 3 VTR section 4 Unit for vibration detection 5 Subtractor 6 Vibration noise monitoring section 7 Level adjusting section 8 Phase adjusting section 9 A / D converter 10 A / D converter 11 D / A converter

Claims (1)

[Claims] 1. A microphone for collecting sound, a unit for detecting only a vibration component applied to the microphone and converting it into an electric signal, and means for subtracting the output signal of the unit from the output signal of the microphone. Video integrated camera.