Systems and methods for improving performance in a digital amplifier by adding an ultrasonic signal to an input audio signal
US7649410B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2007 |
| Grant date | Jan 19, 2010 |
| Priority date | — |
| Expiry date | Mar 27, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2201/3236
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Systems and methods in which an ultrasonic signal is introduced into an audio signal before the audio signal is amplified by a switching amplifier. The added ultrasonic signal (e.g., a tone at half the amplifier's switching frequency) shifts the signals input to a set of power switches so that they do not switch nearly simultaneously. The ultrasonic signal causes the output current to be well defined to eliminate dead time distortion at low signal levels. Adding the tone ultrasonic signal causes the distortion to shift to an amplitude greater than zero. Signals that exceed this amplitude will experience the distortion, but the distortion will be less noticeable than in lower-amplitude signals. Signals that do not exceed this amplitude will not experience the distortion at all. Adding an ultrasonic signal may also draw energy away from the switch frequency and its harmonics to interference with AM radio reception.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.