A technique that is used to sample voice waves and convert them into digital code. Delta modulation typically samples the wave 32,000 times per second, but generates only one bit per sample.

The Delta-Sigma Modulator is the core of the ADC and is responsible for digitizing the input analog signal while reducing noise through a couple of techniques, namely oversampling and noise shaping.

based on the oversampling ratio (OSR), enhancing both power efficiency and signal quality[1]. Another study introduced a discrete-time delta-sigma modulator that employs a cascoded floating ...

The AR36T05 is a soft macro low-power high-performance digital microphone interface modulator IP. The IP converts stereo/mono 1-bit pulse-density modulated (PDM) bit stream data from external ...

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It then uses Sigma-Delta modulation to encode the analog signal into a binary bitstream. You should really try this out. The picture above is from when I was testing it out since it only took a ...