Method and apparatus for alarm volume control using pulse width modulation
US7079036B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 2004 |
| Grant date | Jul 18, 2006 |
| Priority date | — |
| Expiry date | Oct 5, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B3/10
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
There is provided herein a first preferred arrangement of the instant invention, wherein an electronic patient monitor utilizes a computer CPU as an alarm signal generator, which CPU is preferably directly connected to a power amplifier and/or a speaker without an intervening (or subsequent) conventional volume control. The alarm signal is preferably expressed as a series of square waves. The volume of the alarm signal as heard through the speaker is controlled by varying the width of the square waves that represent the alarm signal with the duty cycle of the square waves being shortened to reduce the output alarm volume and lengthened to increase it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.