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An audio signal is a representation of sound waves in a different form. Typically this is an electrical voltage, but these signals can be expressed through alternative mediums such as magnetic particles, when recorded onto analogue tape; or as RF waves, when broadcast through radio; or even as pulses of light, when transmitting through fiber optic cables like TOSLINK. An audio signal can be manipulated, stored, transmitted and reproduced in ways that a sound wave cannot. Microphones convert sound pressure waves into voltage, an electrical audio signal. Therefore you find the microphone sensitivity as millivolts per pascal. Loudspeakers or headphones convert an electrical audio signal into sound. Although many audio signals have their origin as a sound wave, devices such as synthesisers are designed to create audio signals. Electric energy flows through a circuit as voltage. The opposition to voltage is impedance. Impedance is measured in ohms. To measure electric energy in an audio signal, decibels are used in relation to either power (dBm) or voltage (dBu or dBv, and dBV). dBm was originally used, but is no longer as popular as the other units.
Herausgeber Frederic P. Miller
Herausgeber Agnes F. Vandome
Herausgeber John McBrewster