| 发明名称 | Multi-band harmonic discrimination for feedback suppression | ||
| 摘要 | A method and audio signal processor for detecting feedback in an electrical amplification system divides a frequency spectrum into a plurality of frequency bands, classifies a tone present in an incoming audio signal into one of the plurality of frequency bands based on a frequency of the tone, selects a threshold value based on the frequency band into which the tone is classified, and disqualifies the tone from potentially being feedback if an amplitude of the tone is greater than an amplitude of a harmonic of the tone by less than the threshold value. The tone is deemed to be potentially feedback if the amplitude of the tone is greater than an amplitude of a plurality of harmonics of the tone by at least the threshold value. | ||
| 申请公布号 | US9351072(B2) | 申请公布日期 | 2016.05.24 |
| 申请号 | US201314071806 | 申请日期 | 2013.11.05 |
| 申请人 | Bose Corporation | 发明人 | Siegel Michael Arthur;Perkins Christopher J.;George Alexander Michael |
| 分类号 | H04B15/00;H04R3/02;H04R27/00 | 主分类号 | H04B15/00 |
| 代理机构 | Schmeiser, Olsen & Watts LLP | 代理人 | Schmeiser, Olsen & Watts LLP |
| 主权项 | 1. A method for detecting feedback in an electrical amplification system, the method comprising: dividing a frequency spectrum into a plurality of frequency bands; classifying, by a processor receiving an incoming audio signal, a tone present in the incoming audio signal into one of the frequency bands based on a frequency of the tone; selecting a threshold value with the processor based on the frequency band into which the tone is classified, the threshold value being different from at least one other threshold value associated with another one of the frequency bands; and disqualifying the tone from potentially being feedback if an amplitude of the tone is determined by the processor to be greater than an amplitude of a harmonic of the tone by less than the threshold value. | ||
| 地址 | Framingham MA US | ||