Impedance compensation circuit in a speaker driving system
US4969195A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 28, 1989 |
| Grant date | Nov 6, 1990 |
| Priority date | — |
| Expiry date | Apr 28, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/002
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an impedance compensation circuit of a speaker driving system, an ideal impedance state of the speaker can be equivalently formed by the equivalent impedance means, and is compared with an impedance state of an actual speaker. On the basis of the comparison result, a positive feedback gain in the speaker driving means is controlled. Therefore, even when the internal impedance of the speaker or the impedance of the connecting cable varies, or when the internal impedance of the speaker is changed upon a change in temperature, the motional impedance of the speaker can always be driven and damped with a constant driving impedance. For this reason, in the negative-impedance driving system, an ideal speaker control state can always be realized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.