Failure detection device for vehicle speaker
US9060218B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 14, 2012 |
| Grant date | Jun 16, 2015 |
| Priority date | — |
| Expiry date | Oct 11, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2499/13
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A failure detection device for a vehicle speaker includes a signal generator, an amplifier, a coupling capacitor, a detection circuit, and a determination section. The signal generator generates a sound signal corresponding to a sound outputted from the speaker. The amplifier amplifies the sound signal generated by the signal generator. The coupling capacitor supplies the sound signal amplified by the amplifier to the speaker. The detection circuit directly or indirectly detects a terminal voltage on a terminal of the speaker. The determination section determines whether an open-circuit occurs in the speaker based on a phase difference between a phase of the sound signal and a phase of the terminal voltage. The terminal of the speaker is coupled to the coupling capacitor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.