Digital sound: Sampling-rate synchronisation by variable delay

In a situation where a number of digital sound signals, all from sources operating at nominally the same sampling frequency, need to be processed, a variable delay technique may be used to synchronize the signals at the input to the processor. Experimental equipment is described which changes the sampling rate of a digital sound signal by using a variable delay which is automatically reset during program pauses. Listening tests indicate that the adjustment of sampling rates by a small amount using this technique can be achieved with little or no impairment to the sound signal.