Signal strength information dependent control of small electrodynamic transducers in audio systems
US7764796B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 28, 2003 |
| Grant date | Jul 27, 2010 |
| Priority date | — |
| Expiry date | Feb 11, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R25/356
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A control circuit for a signal strength information dependant frequency response adaptation of an audio signal for an electrodynamic transducer, with a signal strength information determinator for determining a signal strength information according to a level of the audio signal, and a frequency modifier for frequency selectively modifying the audio signal in response to the signal strength information. The electrodynamic transducer converts the audio signal into a low distortion sound signal for high levels of an audio signal and has a flat frequency response for low levels of an audio signal. A lower frequency range of the audio signal is modified with a gain that is different to a gain of a higher frequency range of the audio signal. A frequency separating the lower frequency range from the higher frequency range is shifted towards higher values for an increasing level of the audio signal and towards lower values for a decreasing level of the audio signal. A mobile telecommunication terminal can include an accordingly designed control circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.