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Science > Acoustics

autospectrum

Science; Acoustics

For FFT measurements, the Fourier transform of a time signal is complex as it has magnitude and phase. The autospectrum is the average of the squared magnitude. For 1/n-octave ...

CE marking

Science; Acoustics

A label to show an instrument conforms to the specification of a European directive.

noy

Science; Acoustics

A linear unit of noisiness or annoyance. 1 Noy is defined as the noisiness of a 1000 Hz tone at a SPL of 40 dB, 2 Noys is twice as noisy as a 1 Noy and half as noisy as 4 Noys.

null

Science; Acoustics

A low or minimum point on a graph. A minimum pressure region in a room.

Fourier transform

Science; Acoustics

A mathematical operation for decomposing a time function into its frequency components (amplitude and phase). The process is reversible, and the signal can be reconstructed from ...

noise floor

Science; Acoustics

A measure of the signal created from the sum of all noise sources and unwanted signals within a measurement system. Signals beneath the noise floor cannot be measured.