Method and apparatus of an acoustic energy detection circuit for a pulse density modulation microphone
US10484005B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 10, 2019 |
| Grant date | Nov 19, 2019 |
| Priority date | — |
| Expiry date | Apr 10, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R19/016
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A PDM (pulse density modulation) signal energy detection circuit includes a digital-to-analog converter circuit for receiving a PDM digital input signal and producing an analog output signal based on the PDM digital input signal. The PDM signal energy detection circuit also includes a comparator circuit for receiving the analog output signal from the digital-to-analog converter circuit and producing a pulsed signal when a magnitude of the analog output signal exceeds a pre-set threshold. The PDM signal energy detection circuit also has a counter circuit for receiving the pulsed signal from the comparator circuit and producing an energy detection signal when a number of consecutive pulsed signals exceed a pre-set count.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.