Audio amplifier and power supply voltage switching method
US9571040B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 6, 2013 |
| Grant date | Feb 14, 2017 |
| Priority date | — |
| Expiry date | Jun 5, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/511
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An audio amplifier is provided with: an amplifier circuit; a power supply circuit that generates a plurality of power supply voltages; a power supply relay that selects one of the power supply voltages as the power supply voltage supplied to the amplifier circuit; a switching condition determiner that determines whether the switching condition of the power supply relay is satisfied; a silent section detector that detects a silent section of the audio signal which is equal to or greater than the operation time of the power supply relay; and a switching instruction unit for providing the power supply relay with an instruction for switching the power supply voltage during the silent section when the switching condition is satisfied and the silent section is detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.