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Entries found for search: gain

amplifier gain : The amount of amplification that an amplifier provides is called its gain. The gain is a ratio of the input signal level to the output signal level and is simply a number. Commonly expressed in dBindB, one should not express the voltage gain of an amplifier in dBindB unless the input and output impedances are matched as the gain of a typical amplifier is not related to its power output capability. For instance, if an amplifier has a voltage gain of 10, it might be said that it has a gain of 20dB because it actually would raise the power level of a signal by 20dB if the input and output impedances were matched. In practice, however, this is very seldom the case, and the true power gain is usually very much different from what would be predicted by the voltage gain. See impedance matching.

gain : The output voltage of a device divided by its input voltage. Most passive devices have a negative voltage gain, and most active devices, especially amplifiers, have a positive voltage gain. Usually expressed in dBindB, this is correct only if the input and output impedances are the same, a condition not usually met. The square of a voltage ratio is a power ratio if the condition of matched impedances is met. See amplifier gain, impedance-matching.

gain-before-threshold : In a compressor or limiter, the decibel gain applied to signals below the threshold level, i.e., before the compression circuit.

gain control : The fader that controls the strength of the output signal of an amplifier. This term is misused on many amplifiers, since the gain remains constant, while the gain control actually adjusts the signal input level. Also erroneously called volume control on consumer equipment.

gain riding : Manual, real-time volume control during recording to prevent overload and distortion at loud levels, and to avoid noise problems at low levels.

gain stages : Electronic components (or sets of components) whose purpose is to provide signal amplification in an active device.

in-band gain : The standard for adjusting subwoofer response such that the subwoofer SPL, within the operating range of the loudspeaker, is louder than a full-range screen speaker in the same frequency range. All modern digital film sound formats use 10dB of in-band gain.

spectral gain intermodulation : The misuse of a (manual) compressor, set to high ratios and fast attack and release constants, producing loss of transients, loss of high-end, and other undesirable effects such as a kick drum ducking the vocals. The remedy for spectral gain intermodulation is to set a low threshold to bring low signals up, but also to be less extreme in the ratio, attack, and release settings. See also breathing.

unity gain : A device which neither attenuates nor amplifies a signal. Most signal processing devices have unity gain, which means that they neither amplify sound nor cause insertion loss, and therefore can be added into an audio system at various places without upsetting the overall gain of the system.

voltage gain : See gain.



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