Audio device and volume adjusting circuit for the audio device
US8320587B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 18, 2009 |
| Grant date | Nov 27, 2012 |
| Priority date | — |
| Expiry date | Dec 17, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2430/01
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An audio device includes an internal sound producer, an earphone jack, a detection circuit, a volume adjustor, and an amplifier. The detection circuit detects a connection between the earphone jack and an external sound producer, generates a first state signal when the connection is established, generates a second state signal when no connection is established. The volume adjustor is preset with first predetermined volume levels and second predetermined volume levels, generates first adjustment signals based on the first predetermined volume levels in response to the first state signal, and generates a second adjustment signal based on the second predetermined volume levels in response to the second state signal. The amplifier amplifies audio signals and adjusts the volume of the amplified audio signals according to the adjustment signals, then sends the amplified audio signals to the internal sound producer and earphone jack.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.