Sound emission and collection device, and sound emission and collection method
US9807215B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 2015 |
| Grant date | Oct 31, 2017 |
| Priority date | — |
| Expiry date | Apr 14, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2203/509
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A sound emission and collection device includes a speaker, a filter processing a sound emission signal, microphones, echo cancellers cancelling regression sound signals of the sound emitted by the speaker from the sound collection signals of the corresponding microphones, a first integration section integrating adaptive filter coefficients taken out from the plurality of echo cancellers, a reverberation time estimation section estimating the reverberation time for each frequency band in the space in which the speaker and the plurality of microphones are present on the basis of the integrated adaptive filter coefficient, and an arithmetic operation section specifying a frequency band having a long reverberation time from the sound emission signal based on the estimated reverberation time, calculating a filter coefficient for suppressing power of the specified frequency band, and setting the filter coefficient to the filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.