Signalwhite

Signalwhite is a term used in signal processing and audio engineering to denote a form of synthetic noise used for testing and calibration. In general usage, signalwhite refers to a signal whose power spectral density is approximately flat across a defined bandwidth, analogous to white noise.

The term combines “signal” with “white” from white noise and is used in documentation and software to distinguish test sources from purely deterministic signals. Its exact definition can vary by context, but it commonly signifies a broad-spectrum, noise-like signal intended to excite a wide range of frequencies in a system under test.

Generation and properties commonly involve sampling a random process, such as a uniform or Gaussian distribution, to create a sequence of samples. The signal may be filtered to achieve a target bandwidth and amplitude distribution and can be produced as a streaming source or finite bursts. Implementations often include controls for sample rate, duration, and amplitude envelope to manage transients and long-term stability.

Applications of signalwhite include characterizing frequency response, dynamic range, and linearity of audio devices and communication systems. It is used for calibrating ADCs and DACs, testing loudspeakers, evaluating room acoustics, and validating measurement chains.

Variants and related terms: while inherently a white-noise based signal, some implementations provide band-limited, pink, or colored variants to suit specific testing needs. In practice, the term signalwhite is context-dependent and may refer to any broadly flat-spectrum test signal within a defined band.

See also: White noise, Pink noise, Signal processing, Calibration.