CN2135221Y

CN2135221Y - Noise-proof sound-gathering microphone

Info

Publication number: CN2135221Y
Application number: CN 92228242
Authority: CN
Inventors: 方颖; 林祥芬
Original assignee: FUJIAN RADIO BROADCASTING AND TELEVISION UNIV
Current assignee: FUJIAN RADIO BROADCASTING AND TELEVISION UNIV
Priority date: 1992-07-16
Filing date: 1992-07-16
Publication date: 1993-06-02
Anticipated expiration: 2002-07-16

Abstract

The utility model relates to a noise-proof sound-gathering microphone, which is composed of a parabolic reflection surface for sound wave, an acoustic impedance matching device, an electret microphone core and an operational amplifier. The acoustic impedance matching device, the electret microphone core and the operational amplifier are arranged at the position of a focal point on the principal axis of the parabolic reflection surface for sound wave, and the trumpet-shaped opening of the acoustic impedance matching device faces the right front of the parabolic reflection surface for sound wave, a tangential plane at the position of the vertex of the parabolic reflection surface for sound wave is provided with a fixed hold handle, and three positions of the porch of the parabolic reflection surface for sound wave are fixed by support legs to form a whole. The utility model has the advantages of less noise, strong sound-gathering performance, high sensitivity, the convenience for an interview, simple processing technology, low cost, etc.

Description

Noise-proof sound-gathering microphone

Functions such as the utility model relates to a kind of novel microphone, has the noise of reduction and assembles main sound, and tonequality is good belong to the microphone class.

The use of microphone is very extensive, oratorical contest, concert, theatrical performances and TV, drama, broadcast, recording, journalist's interview or the like, all to use microphone, especially having under numerous interviewers' the occasion, many reporters fall over each other recording, when speech of acquisition target, and often noise is big, keynote is little, under environment like this, the poly-acoustic performance of noise control that how to improve microphone is a crucial scientific research task, also is numerous journalistic urgent hope.

The purpose of this utility model is: develop the microphone of a kind of noise control, poly-sound, with the poly-acoustic energy power of the noise control that improves existing microphone, improve microphone sensitivity, improve recording quality.

The technical scheme that realizes the purpose of this utility model is:

The poly-sound of noise control microphone comprises the Electret condenser microphone fuse, operational amplifier, acoustic impedance adaptation, sound wave parabolic reflector; Electret condenser microphone fuse and operational amplifier are positioned in the inside of acoustic impedance adaptation, the opening of acoustic impedance adaptation faces the sound wave parabolic reflector, and be positioned on its main shaft, the Electret condenser microphone fuse is positioned at the focus on the sound wave parabolic reflector main shaft, and the profile of acoustic impedance adaptation is outwards enlarge gradually tubaeform; The sound wave parabolic reflector is satisfied with equation (rectangular coordinate system) y ²=4fx wherein y is an ordinate, x is an abscissa, f is the focal length of parabolic reflector, the Electret condenser microphone fuse converts the acoustic signals of receiving to the signal of telecommunication, its anode is delivered to the reversed input terminal 2 of operational amplifier by capacitor C 1 series resistor R2, the signal negativing ending grounding, microphone fuse upper end connects power positive end by resistance R 1, the terminal 7 of operational amplifier connects power positive end, power positive end is also received terminal 3 by resistance R 4, and terminal 3 also passes through resistance R 5 ground connection, terminal 4 ground connection, terminal 2 is connected with terminal 6 by resistance R 3, and terminal 6 is by capacitor C 2 output signals.

Fig. 1 is the schematic side view of the poly-sound of noise control microphone structure

Fig. 2 looks schematic diagram for the master of the poly-sound of noise control microphone structure

Fig. 3 is the fundamental diagram of the poly-sound of noise control microphone

Wherein: 1-Electret condenser microphone fuse, the 2-operational amplifier, 3-acoustic impedance adaptation, 4-sound wave parabolic reflector, the 5-microphone is held bright, 6-spike, 7-lead-in wire

Now further structure of the present utility model is described by drawings and Examples.

Embodiment:

Make throwing sound wave parabolic reflector with aluminium by mould pressing method, its bore is 1 meter, subtended angle is 140 degree, its focal length is a f=0.357 rice by calculating as can be known, place, summit at the sound wave parabolic reflector links to each other with lever, three place's spike is arranged with fixed parabolic placement on the edge, and the acoustic impedance adaptation is together with Electret condenser microphone fuse and operational amplifier, be installed in the focus place on the parabolic reflector main shaft together, the output of operational amplifier is picked out by lead-in wire.

The poly-sound of the noise control that uses when in practicality the reporter being interviewed microphone can design to such an extent that bore is a little bit smaller, and for the microphone that is fixedly placed on the meeting-place, the bore of its parabolic reflector can design more greatly.

The utility model with the advantage that existing microphone is compared is:

1, noise is little, and poly-acoustic performance is good;

2, working sensitivity height;

3, make things convenient for acquisition;

4, processing technology is simple, and cost is few.

Claims

1, the poly-sound of noise control microphone comprises the Electret condenser microphone fuse, and operational amplifier is characterized in that, it also comprises the acoustic impedance adaptation, the sound wave parabolic reflector; Electret condenser microphone fuse and operational amplifier are positioned in the inside of acoustic impedance adaptation, and the opening of acoustic impedance adaptation faces the sound wave parabolic reflector, and are positioned on its main shaft, and the Electret condenser microphone fuse is positioned at the focus place on the sound wave parabolic reflector main shaft;

2, the poly-sound of noise control according to claim 1 microphone is characterized in that: the profile of acoustic impedance adaptation is outwards enlarge gradually tubaeform;

3, according to claim 1 or the poly-sound of the described noise control of claim 2 microphone, it is characterized in that the sound wave parabolic reflector, be satisfied with equation (rectangular coordinate system) y ²=4fx wherein y is an ordinate, and x is an abscissa, and f is the focal length of parabolic reflector.

4, gather the sound microphone according to claim 1 to the described noise control of claim 3, it is characterized in that the Electret condenser microphone fuse converts the acoustic signals that receives to the signal of telecommunication, its anode is delivered to the reversed input terminal 2 of operational amplifier by capacitor C 1 series resistor R2, the signal negativing ending grounding, microphone fuse upper end connects power positive end by resistance R 1, the terminal 7 of operational amplifier connects power positive end, power positive end is also received terminal 3 by resistance R 4, terminal 3 is also by resistance R 5 ground connection, terminal 4 ground connection, terminal 2 is connected with terminal 6 by resistance, and terminal 6 is by capacitor C 2 output signals.