KR100219147B1 - Zoom mike apparatus for camcorder - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a sound signal processing system for a camcorder, in which a microphone for recording a comcorder is constructed using a gun type directional microphone cell, By adjusting the directivity, the reception sensitivity of the acoustic signal is increased or decreased. It also offers the advantage of eliminating external noise through the holes in the directional microphone cell.

Description

Zoom microphone unit of camcorder

FIG. 1 is a configuration diagram showing a zoom microphone device applied to the present invention; FIG.

Fig. 2 is a conceptual diagram for explaining a directional microphone cell used in a zoom microphone device; Fig.

DESCRIPTION OF THE REFERENCE NUMERALS

12: omnidirectional microphone cell 14: directional microphone cell

20: switching unit 30: loading / unloading motor

40: Microphone signal gain adjustment unit 50: Zoom control unit

60: A / V jack 70: Audio signal processor

80: Amplifier

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound signal processing system of a camcorder and, more particularly, to a zoom microphone of a camcorder for controlling a zoom state of a recording microphone, ≪ / RTI >

When shooting objects with a camcorder, when zooming in on an object at a distance, the image of the subject is largely enlarged. However, the resulting acoustic signal is not amplified so as to be suitable for zooming and raising, So that only the noise becomes larger. For example, when photographing a meeting scene, the photographer can zoom in on the current central character by using the zoom function of the camcorder, and intensively photograph the scene. However, the voice of a person who speaks is amplified and amplified in the same manner as the enlarged video signal, but only the surrounding acoustic signal is emphasized, so that only the noise is heard. That is, there is a problem that the voice of the speaker is not heard properly even if the image is greatly enlarged.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to solve the above-mentioned problems, and to solve the above problems, it is an object of the present invention to provide a directional microphone cell, And a zoom microphone device of a camcorder capable of down / down.

According to another aspect of the present invention, there is provided a sound processing system of a camcorder, comprising: microphone means for receiving an acoustic signal by variably adjusting a direction in which an acoustic signal added to an input video signal is received; A zoom control unit for outputting a directivity control signal to the microphone means and corresponding to a zoom up / down key signal applied from the outside in order to vary the receiving direction of the acoustic signal, and outputting a gain control signal to the microphone signal gain control unit, A microphone signal gain adjustment unit for variably adjusting a gain of an acoustic signal output from the microphone unit in response to a gain control signal applied from the microphone unit, and an audio signal processing unit for processing and recording the gain-controlled microphone signal by processing an audio signal The camcorder is in the zoom microphone device.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a configuration diagram showing a zoom microphone device applied to the present invention. In the first figure, the zoom microphone device of the present invention includes an omnidirectional microphone cell 12 that absorbs all ambient sounds and a directional microphone cell 14 that intensively absorbs sound in a specific direction. The output mic signals of the omnidirectional microphone cell 12 and the directional microphone cell 14 are applied to the switching unit 20 and the switching unit 20 switches one of the two microphone signals according to the switching selection signal of the zoom control unit 50 Select. The microphone signal gain adjustment unit 40 adjusts the gain of the microphone signal applied from the switching unit 20. [ The audio signal processor 70 processes the gain-adjusted microphone signal and outputs the microphone signal to the A / V jack 60 and the amplifier 80.

The operation of the present invention will be described in more detail with reference to FIG. The user operates the key input unit to input a zoom up key signal to the zoom control unit 50. [ Here, if the zoom control level of the zoom controller 50 is higher than a predetermined reference level, the omnidirectional microphone cell does not operate and the directional microphone cell operates. The zoom control unit 50 outputs a loading control signal to the loading / unloading motor 30 in response to a zoom up key signal. At this time, the directional microphone cell 14 is variably adjusted in length according to the driving of the loading / unloading motor 30. The zoom control unit 50 also outputs a switching selection signal to the switching unit 20 to select the output of the directional microphone cell 14. Therefore, the microphone signal gain control unit 40 receives the microphone signal of the directional microphone cell 14 applied from the switching unit 20. The microphone signal gain control unit 40 receives the zoom gain control signal from the zoom control unit 50 and adjusts the gain of the microphone signal of the directional microphone cell 14. [ For example, the microphone signal gain control unit 40 increases the gain of the microphone signal applied from the directional microphone cell 14 when the level of the zoom gain control signal applied from the zoom control unit 50 becomes higher. Therefore, as the gain of the microphone signal gain controller 40 increases, the gain of the audio signal in a certain direction increases and the noise around the microphone signal decreases. The audio signal processing unit 70 outputs the audio signal applied from the microphone signal gain control unit 40 to the A / V jack 60 and the amplifier 80. The signal-processed audio signal is output to the speaker via the A / V jack 60. On the other hand, the audio signal passed through the amplifier 80 is outputted to the recording head.

FIG. 2 is a conceptual diagram showing a directional microphone cell 14 applied to the present invention. As shown in FIG. 2, the directional microphone cell 14 uses a gun type microphone cell composed of an inner pipe Y in the outer pipe X so that the length can be adjusted. The directional microphone cell 14 can pull the inner pipe Y out of the outer pipe X and vary the entire length X + Y thereof. As the length of the entire pipe becomes longer, the directivity becomes stronger in this gun type microphone cell. That is, when zooming up, the overall pipe length (X + Y) of the zooming amplifier is gradually increased to increase the directivity, thereby increasing the reception sensitivity of the acoustic signal to a specific direction. Further, in the directional microphone cell 14 of the present invention, as shown in FIG. 2, there is a hole a in the outer and inner pipes. This hole converts the phase of the external noise, and combines the phase-converted external noise with the original external noise to cancel each other, thereby reducing the external noise. This hole also increases the number of holes as the outer pipe becomes longer (from A to A '). The more holes, the better the ability to block external noise.

As described above, according to the present invention, a microphone for recording a camcorder is constructed by using a directional microphone cell of a gun type, and the directivity of the directional microphone cell is adjusted by varying the overall length of the directional microphone cell, . It also offers the advantage of eliminating external noise through the holes in the directional microphone cell.

Claims (5)

1. A sound processing system of a camcorder, comprising: microphone means for variably adjusting a direction in which an acoustic signal added to an input video signal is received to receive an acoustic signal; A microphone control unit for outputting a directivity control signal to the microphone unit so as to correspond to a zoom up / down key signal applied from the outside in order to vary an acoustic signal reception direction of the microphone unit, and a gain control signal for outputting a gain control signal to the microphone signal gain control unit, ; A microphone signal gain control unit for variably adjusting a gain of an acoustic signal output from the microphone unit in response to a gain control signal applied from the zoom control unit; And audio signal processing means for processing and recording the gain-controlled microphone signal by processing an audio signal. 2. The apparatus of claim 1, wherein the microphone means comprises: an omnidirectional microphone cell for receiving all ambient sounds; A directional microphone cell for intensively receiving sound in a specific direction; And a switching unit for selecting an output of the omnidirectional microphone cell and the directional microphone cell according to a switching selection signal applied from the zoom control unit. [3] The directional microphone cell of claim 2, wherein the directional microphone cell is a gun type including an inner pipe in an outer pipe, and the inner pipe is drawn out of the outer pipe to adjust an overall length thereof A zoom microphone device of the camcorder. The zoom microphone device of claim 3, wherein the microphone unit further comprises a loading / unloading motor for outputting a driving signal to vary the overall length of the directional microphone cell. 4. The camcorder according to claim 3, wherein the directional microphone cell has a hole in the outer and inner pipes, the hole changing the phase of the external noise so as to synthesize the changed noise and the original external noise, Zoom microphone device.