Audio signal processing circuit
US8447251B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 29, 2009 |
| Grant date | May 21, 2013 |
| Priority date | — |
| Expiry date | Apr 4, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2001/045
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An audio signal processing circuit comprising: a modulation circuit configured to output a modulated signal of a frequency corresponding to an input audio signal; a drive circuit configured to generate a driving current for driving the modulation circuit based on a control signal; an audio detection circuit configured to detect presence or absence of the audio signal input to the modulation circuit; and a control signal generation circuit configured to generate the control signal for generating the driving current in the drive circuit when the presence of the audio signal is detected and generate the control signal for stopping generation of the driving current in the drive circuit when the absence of the audio signal is detected for a predetermined period, based on a detection result of the audio detection circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.