Portable electronic device
US8363857B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 20, 2007 |
| Grant date | Jan 29, 2013 |
| Priority date | — |
| Expiry date | Nov 28, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S7/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A portable electronic device includes a player, a speaker, a control circuit, a switch circuit, and a current limiter. The player is for outputting analog audio signals. The speaker is for transforming the analog audio signals into sound. The control circuit is for generating a first control signal when ambient light intensity is lower than a predetermined value. The switch circuit is for turning on and transmitting the analog audio signals to the speaker when receiving the first control signal. The current limiter is for transmitting the analog audio signals to the speaker when the switch circuit turns off, and for limiting a current flowing through the speaker.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.