Circuit for PCM conversion of an analogic signal, with improvement in gain-tracking

摘要

The circuit comprises a filter to the input whereof said analogic signal is applied, a quantizer driven by the filter, a sampler at a desired frequency driven by the quantizer and a PCM encoder driven by the sampler. According to the invention, the circuit furthermore comprises circuital means for detecting the difference between the analog signal and the quantized one, and for injecting in feedback said difference in a stage of the filter in such a manner that the transfer function from the input of said circuital means for detecting the difference at the output of the filter corresponds to a low-pass filtering.