Sound generator circuit system and method
US6725109B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 2001 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | Oct 4, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A sound generator circuit configured for a handheld computer is disclosed. A method of producing a tone with a sound generator and handheld computer is also disclosed. The sound generator circuit includes a low pass filter having an input and an output. The input is coupled to a pulse width modulated (PWM) signal line. The sound generator circuit also includes a switching circuit coupled to the output of the low pass filter and being controlled by the output of the low pass filter. Further, the sound generator circuit includes a sound generator having a first and a second terminal. Further still, the sound generator circuit can include a high-pass filter coupled across the first and second terminals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.