Drive circuit, device, and method for suppressing noise, and use
US7279964B2 · kind B2 · utility
25Cited by
3References
20Claims
0Family size
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Key dates
| Filing date | Jul 30, 2003 |
| Grant date | Oct 9, 2007 |
| Priority date | — |
| Expiry date | Jul 29, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/372
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A low-frequency PWM-modulated signal and a high-frequency, unmodulated signal for generating a high-frequency PWM-modulated signal is employed directly for driving an output stage of a device for noise suppression. The low-frequency signal and the high-frequency signal is advantageously provided by a microcontroller which already has an AD converter on the input side. The microcontroller furthermore already makes a PWM output signal with a high bit width available which has the high resolution necessary for driving the loudspeaker.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.