Indicator for headroom extension system for tape recorders

摘要

A visual indicator for a tape or cassette recorder, which includes a noise-reduction system which in addition to varying the amplitude level of the recorded signal also varies the high frequency pre-emphasis and the bias current applied to the tape. Decreasing the bias current when high amplitude, high frequency signals are present increases the headroom available on the tape. The visual indicator provides an indicator of the amount of headroom when recording.