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When using multiple microphones, respecting a 3-to-1 rule and placing microphones at least three times further from each other than they are from the source they are being used to pick up avoids cancellation and phase issues such as comb filtering when the microphone signals are mixed together. [11]
Radio call signs are a globally unique identifier assigned to all stations that are required to obtain a license in order to emit RF energy. The identifiers consist of from 3 to 9 letters and digits, and while the basic format of the call signs are specified by the ITU-R Radio Regulations, Article 19, Identification of stations, [5] the details are left up to each country's radio licensing ...
In audio engineering and sound recording, a high impedance bridging, voltage bridging, or simply bridging connection is one in which the load impedance is much larger than the source impedance. [ 1 ] [ 2 ] [ 3 ] The load measures the source's voltage while minimally drawing current or affecting it.
Similarly, comb filtering may result from mono mixing of multiple mics, hence the 3:1 rule of thumb that neighboring mics should be separated at least three times the distance from its source to the mic. [citation needed]
Provided that the microphones are reciprocal in behaviour, which means the open circuit sensitivity in V/Pa as a receiver is the same as the sensitivity in m 3 /s/A as a transmitter, it can be shown that the product of the transmission factors , , and the acoustical transfer impedance equals the electrical transfer impedance.
Two pins are used for the mono headphone signal and two pins for the unbalanced microphone signal. The 4-pin XLR connector is also commonly used on amateur radio microphones, but transferring unbalanced audio instead, and using the 4th pin (with the common ground) for a push-to-talk (PTT) circuit activated by a button on the microphone.
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A mult box is a device that allows a single audio source, such as a microphone, to be shared to multiple outputs for recording or broadcast. [1] A mult box is sometimes called a press box, but that term is usually reserved for the sports media's section of an arena. It may also be called a press mult box or press bridge. [2]