Patent ID: 9626981
Date: 2017-04-18
CPC Classifications: G10L,H03M

Claim:
1. A system comprising: a delta-sigma analog-to-digital converter comprising: a loop filter having a loop filter input configured to receive an input signal and generate an intermediate signal responsive to the input signal; a multi-bit quantizer configured to quantize the intermediate signal into an uncompressed digital output signal; and a feedback digital-to-analog converter having a feedback output configured to generate a feedback output signal responsive to the uncompressed digital output signal in order to combine the input signal and the feedback output signal at the loop filter input; and a digital compression circuit configured to receive the uncompressed digital output signal and compress the uncompressed digital output signal into a compressed digital output signal having fewer quantization levels than that of the uncompressed digital output signal, wherein for each given sample of the uncompressed digital output signal, the digital compression circuit generates a corresponding sample of the compressed digital output signal based on at least a first quantization level transition between the given sample and a first previous sample sampled consecutively previous to the given sample and a second quantization level transition between the first previous sample and a second previous sample sampled consecutively previous to the first previous sample.