Calibration system for active noise cancellation and speaker apparatus
US10013965B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 16, 2017 |
| Grant date | Jul 3, 2018 |
| Priority date | — |
| Expiry date | Nov 16, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S7/301
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The disclosure is related to a calibration system for active noise cancellation and a speaker apparatus. The calibration system receives the signals with feedforward control or feedback control active noise cancellation. A gain adjustment element is used to adjust a gain of the signals, and a path selection switch is used to switch connection to a first operational amplifier or to a second operational amplifier. In addition to driving signals, the operational amplifier is also used to adjust a phase of the output signals. The calibration system is able to balance the gain of the signals with active noise cancellation and adjust the phase of signals of a left-channel circuit and a right-channel circuit through gain-phase adjustment. The related speaker apparatus is such as an earphone with the feedforward ANC control circuit, the feedback ANC control circuit, or a hybrid ANC circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.