Low-Cost Audio Delay Line Uses 1-Bit ADC.

This article describes the concept of an audio delay line. The voice or music to be delayed is analog-to-digital converted and fed into a shift register or any digital delay or storage medium. The delayed digital signal is fed into a digital-to-analog converter (DAC) and the result is delayed audio. The circuit shown is very low in cost, but it may not look much like a DAC. It is a one-bit oversampled analog-to-digital converter also known as a delta modulator.