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1. (WO2017193877) PULSE DENSITY MODULATION SWITCHING CIRCUIT AND METHOD AND STORAGE MEDIUM

Pub. No.:    WO/2017/193877    International Application No.:    PCT/CN2017/083273
Publication Date: Fri Nov 17 00:59:59 CET 2017 International Filing Date: Sat May 06 01:59:59 CEST 2017
IPC: G06F 17/10
Applicants: SANECHIPS TECHNOLOGY CO., LTD.
深圳市中兴微电子技术有限公司
Inventors: ZHAO, Hengzheng
赵恒正
LI, An
李安
Title: PULSE DENSITY MODULATION SWITCHING CIRCUIT AND METHOD AND STORAGE MEDIUM
Abstract:
A pulse density modulation switching circuit, pulse density modulation switching method and storage medium, the circuit comprising: a cascade integrator (11), a downsampling decimator (12) and a cascade comb filter (13); the cascade integrator (11) is configured to receive a pulse density modulation (PDM) audio signal, accumulate the pulse density modulation (PDM) audio signal, and output to the downsampling decimator (12) the pulse density modulation (PDM) audio signals accumulated by an integrator at each level; the downsampling decimator (12) is configured to decimate the accumulated pulse density modulation (PDM) audio signals at a predetermined interval; and the cascade comb filter (13) is configured to receive the pulse density modulated (PDM) audio signals as decimated by the downsampling decimator (12) and subtract the extracted pulse density modulated (PDM) audio signals to obtain a pulse code modulation (PCM) audio signal. The present circuit simplifies the complex structure of original cascade comb filters, thereby facilitating the implementation of hardware circuits and reducing the amount of occupied resources.