High output impedance audio amplifier for noise rejection
US11166106B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 2020 |
| Grant date | Nov 2, 2021 |
| Priority date | — |
| Expiry date | Jun 1, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2430/01
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A hearable has an audio amplifier circuit coupled to a speaker as a load. The amplifier circuit has current source drive, which attenuates electromagnetically coupled noise of the speaker. In other instances, the amplifier circuit has a first amplifier mode and a second amplifier mode, wherein in the first amplifier mode the amplifier circuit becomes configured to drive the speaker as a voltage source, and in the second amplifier mode the amplifier circuit becomes configured to drive the speaker as a current source. Control logic varies the amplifier circuit between i) the first amplifier mode for larger amplitudes of the audio signal, and ii) the second amplifier mode for smaller amplitudes of the audio signal. Other aspects are also described and claimed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.