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The internal electronic circuitry of an active noise-canceling mic attempts to subtract noise signal from the primary microphone. The circuit may employ passive or active noise canceling techniques to filter out the noise, producing an output signal that has a lower noise floor and a higher signal-to-noise ratio.
Presence is similar to ambience, but is distinguished by a lack of explicit background noise. Every location has a distinct presence created by the position of the microphone in relation to the space boundaries. A microphone placed in two different parts of the same room will record two distinct presences.
The self-noise or equivalent input noise level is the sound level that creates the same output voltage as the microphone does in the absence of sound. This represents the lowest point of the microphone's dynamic range, and is particularly important should you wish to record sounds that are quiet.
A throat microphone, also called a laryngophone, is a type of contact microphone that absorbs vibrations directly from the wearer's throat by way of single or dual sensors worn against the neck. The sensors, called transducers , can pick up speech even in extremely noisy or windy environments, such as on a motorcycle or in a nightclub .
Adaptive feedback cancellation originated during the evolution of the hearing aid. The hearing aid became digital, and as such feedback cancellation was needed. In 1980 a directional microphone was introduced in the digital hearing aid, and adaptive feedback cancellation was created to block external noise that the microphone picked up. Today ...
The use of a wireless microphone placed next to the person speaking eliminates the sounds between them and listener, which reduces the effects of reverberation from poor room acoustics, background noise around the listener, and background noise around the speaker (by using a directional microphone). [3]
Noise gates are useful when editing live recordings to remove background noise between passages or pieces of dialogue. However, care must be taken in setting the gates so they do not trigger due to spurious noises. For vocal applications on stage, an optical microphone switch may be used rather than a noise gate.
The wish to capture or avoid the collection of extraneous noise. This can be a concern, especially in amplified performances, where audio feedback can be a significant problem. Alternatively, it can be a desired outcome, in situations where ambient noise is useful such as capturing hall reverberation and audience reactions in a live recording .
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