Howling remover composed of adjustable equalizers for attenuating complicated noise peaks
US5729614A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1995 |
| Grant date | Mar 17, 1998 |
| Priority date | — |
| Expiry date | Sep 11, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an apparatus for amplifying a sound while suppressing a howling noise, a microphone collects a sound and converts the collected sound into a corresponding input signal. An amplifier amplifies the input signal to generate the sound through a loudspeaker. A plurality of equalizers are interposed between the microphone and the amplifier, each equalizer having a variable attenuation frequency for attenuatively filtering the input signal around the attenuation frequency. Detection is conducted for detecting a plurality of noise spectrum peaks of the howling noise contained in the collected sound. Then, an adjustment is conducted adjusting respective variable attenuation frequencies of the plurality of the equalizers correspondingly to the plurality of the detected noise spectrum peaks to thereby remove the howling noise from the generated sound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.