Glossary definition of 'SINAD'
(Signal In Noise And Distortion) This is the reciprocal of THD+N
and is expressed in dB. Whereas THD+N is the ratio of the noise and distortion to the signal (small is better), SINAD is the ratio of the signal to the noise and distortion (big is better). If the THD+N is -90dB, SINAD under the same conditions would be 90dB. SINAD is more common in communications and broadcast, whereas THD+N is more common in the audio industry.