Comfort noise generation
US9734834B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 2015 |
| Grant date | Aug 15, 2017 |
| Priority date | — |
| Expiry date | Nov 6, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/002
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system for generating comfort noise for a stream of frames carrying an audio signal includes frame characterizing logic configured to generate a set of filter parameters characterising the frequency content of a frame; an analysis filter adapted using the filter parameters and configured to filter the frame so as to generate residual samples; an analysis controller configured to cause the residual samples to be stored in a store responsive to receiving an indication that the frame does not comprise speech; and a synthesis controller operable to select stored residual samples from the store and cause a synthesis filter, inverse to the analysis filter and adapted using filter parameters generated by the frame characterizing logic for one or more frames not comprising speech, to filter the selected residual samples so as to generate a frame of comfort noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.