Audio Terminology And Definitions Dictionary
Near Field The region within approximately two meters of the loudspeakers. Listening tests conducted in the
near field reveal different aspects of a loudspeaker's performance compared with listening in the far
Negative Feedback An amplifier circuit configured so that the output signal is fed back to be compared with the
input signal and any error signals cancelled. Easier to imagine than to achieve the desired results without
unwanted side effects.
Random, unwanted signals that are largely unrelated to the
original signal. Typical examples in audio include hiss and static. Examples on
the video side may include "snow" on an analog television screen or "mosquito noise" in a digital display.
Any technology designed to reduce steady-state
noise (usually analog tape hiss) in the audio reproduction chain. Dolby
Laboratories developed the first commercially successful professional noise
reduction system, Dolby A, in the mid1960s.
Television Systems Committee. The body that establishes standards for television
broadcast and reception in America and Japan (as well as a few other places).
NTSC is also used to describe any hardware or software that conforms to NTSC
standards. Sometimes jokingly called "Never the Same Color" due to technical
difficulties occasionally encountered in accurately broadcasting or receiving
have several meanings. In the acoustic world, a null is the absence of sound
caused by out-of-phase wavefronts that cancel each other.