| Wireless Microphone |
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They can transmit, for example, in radiowaves UHF , VHF , FM , AM , and some cheap models, in Infrared light. The infrared microphones have the disadvantage that they require a line of sight between the microphone and the receiver, while more expensive radio frequency models don't. Some models operate on a single fixed frequency, and the most advanced models are capable to operate under a user selectable frequency to avoid interference and allow the use of several microphones at the same time. ADVANTAGES AND DISADVANTAGES The advantages are:
The disadvantages are:
TECHNIQUES The professional models transmit in radio frequency and are diversity (2 antennas to avoid phase cancellation), which eliminates dead spots and reflection of the radiowaves. Another technique used to improve the sound quality (actually, to improve the dynamic range), is Companding . Some models have adjustable Gain on the microphone itself, to be able to accommodate different level sources, such as loud instruments or quiet voices. The ability to adjust gain helps avoiding Clipping . Some models have adjustable Squelch , which silences the output when the receiver does not get a strong enough (or good enough) signal from the microphone instead of reproducing noise. When squelch is adjusted, the threshold of the signal quality or level is adjusted. |
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