Electronic driving circuit for directing an audio signal selectively to one of two speakers
US7463743B2 · kind B2 · utility
3Cited by
6References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 21, 2004 |
| Grant date | Dec 9, 2008 |
| Priority date | — |
| Expiry date | Jul 16, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A driving circuit selectively operates a hands-free loudspeaker and an earpiece speaker of a mobile terminal. The driving circuit includes a voiceband electronic circuit with a balanced output adapted for being switched between an in-phase and an opposite-phase mode, an interconnection function for connecting the earpiece speaker directly to the balanced output of the voiceband circuit, and an adder circuit for adding signals supplied by each port of the balanced output and for providing the sum-signal to the hands-free loudspeaker.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.