Assertion: reference signal | /r/HasProperty | 1 khz at +4
Facets:
value: in audio engineering
type: OTHER
value: at +4
type: DEGREE
value: usually
type: TEMPORAL
Source sentences:
text: In audio engineering, the reference signal is usually a sine wave at a standardized nominal or alignment level, such as 1 kHz at +4 dBu (1.228 V RMS ).