A programmable-delay line.
A relatively simple circuit is described which delays audio signals in 5 microseconds steps from 0 microsecond to 4000 microseconds. Delays are programmed via twelve TTL-level data lines. The magnitude response is flat and the phase response is linear from DC to 5 kHz. The gain of the circuit is fixed and independent of the selected delay. Delays are accurate to within 1 microsecond of the programmed value. The device is a nice alternative to other methods which have diverse shortcomings.
D000161:Acoustic Stimulation / Q000379:methods*; D001698:Biomedical Engineering; D003201:Computers; D006320:Hearing Tests / Q000379:methods*; D006801:Humans