Choose microphone, should mix according to use occasion the requirement of pair of sound quality, combine the characteristic of all sorts of microphone, consider integratedly to choose. For example, the recording of high quality and broadcast, main demand acoustic quality is good, should choose capacitance type microphone, aluminous area microphone or advanced microphone of the type that use a group; When making general enlarge news, choose common the type that use a group can; Often move when speaking person position or be apart from with amplifier when the speech bigger, if card pulls OK to sing, should choose the microphone with home remedy tropism, inferior sensitivity, wait in order to reduce interference of small impurities sound. Microphone of use capacitance type needs phantom power supply, there is voltage of demonstrative power supply inside the technical parameter of microphone commonly, want to choose the phantom power source of appropriate voltage, what sound console deploys is 48V phantom power supply commonly.
In use still should notice:
1, impedance matchs
When use microphone, the outputs impedance and amplifier input impedance of microphone is both and identical it is first-rate matchs, if break,deserve to compare in 3: 1 above, can affect transmission result. When receiving 50 Ω microphone to input impedance to be 150 Ω amplifier for example, although output can increase close 7Db, but the sound of frequency of on any account can get apparent loss.
2, jumper
The output voltage of microphone is very low, to escape damage estrangement is disturbed, jumper must as far as possible short, the microphone of high quality should choose Shuang Xinjiao to combine metallic screen line, general microphone can use Chan Xinjin to belong to screen line. Length of transmission line of microphone of tall impedance type is unfavorable more than 5 meters, otherwise high will remarkable loss. Can extend even the line of low block microphone to 30m- - 50m.
3, working space and say effect nearly
Normally, the working space between microphone and mouth is in 30cm- - 40cm is advisable, if be apart from too far, criterion the echo increases, noise grows relatively; Working space is too close, because signal is too strong and the meeting is lack fidelity, low frequency sound is overweight and the definition that affects a language. Because directivity microphone is existing,this is " tells effect " nearly, namely close quarters is sowed when telling, low frequency sound can get rising apparently. Nevertheless, sometimes does the singer use " to say effect nearly of purpose? "Make sing the effect more wonderful, pleasant.
4, the angle between acoustical source and microphone
Every microphone has its effective point of view, general tone source should aim microphone center line, both slant part is larger, high loss is bigger. When using microphone sometimes, contain " grand chirp " sound, at this moment microphone deflexion a few angle, can reduce a few.
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