A "mark" that has the same polarity as the previous "mark" in the transmission of alternate mark inversion (AMI) signals.
Note: In some transmission protocols, AMI violations are deliberately introduced to facilitate synchronization or to signal a special event.

1. An electronic component that boosts the voltage or power level of a signal that is a linear replica of the input signal, but with greater power or voltage level, and sometimes with an impedance transformation. The output may also be a nonlinear analog function of the input signal, as in a signal compression device.
2. See fiber amplifier, optical… (Read More →)

1. See signal compression.
2. In video production, the imposition of a nonlinear transfer function on (i.e., the nonlinear processing of, to reduce the dynamic range of) signal amplitude values (e.g., as in gamma correction). [After SMPTE]

Distortion occurring in a system, subsystem, or device when the output amplitude is not a linear function of the input amplitude under specified conditions.
Note: Amplitude distortion is measured with the system operating under steady-state conditions with a sinusoidal input signal. When other frequencies are present, the term "amplitude" refers to that of the fundamental only.

A corrective network that is designed to modify the amplitude characteristics of a circuit or system over a desired frequency range.
Note: Such devices may be fixed, manually adjustable, or automatic.

See hit.

Deprecated term. See intensity modulation.

Keying in which the amplitude of a signal is varied among the members of a set of discrete values.

Modulation in which the amplitude of a carrier wave is varied in accordance with some characteristic of the modulating signal.
Note: Amplitude modulation implies the modulation of a coherent carrier wave by mixing it in a nonlinear device with the modulating signal to produce discrete upper and lower sidebands, which are the sum and difference frequencies of the carrier and… (Read More →)

Synonym compatible sideband transmission.