System and method for suppressing noise in digitally represented voice signals
US6097820A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 23, 1996 |
| Grant date | Aug 1, 2000 |
| Priority date | — |
| Expiry date | Dec 23, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L2021/02168
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A noise suppressor that increases a signal to noise ratio of time domain audio data and a method of increasing such signal to noise ratio. The noise suppressor includes: (1) frequency domain transformation circuitry that transforms a frame of the time domain audio data into a frequency domain, (2) noise background modeling circuitry, coupled to the domain transformation circuitry, that spectrally analyzes the frame to model an estimated noise background spectrum thereof, (3) a frequency domain suppression filter, coupled to the noise background modeling circuitry, that filters at least some of the noise background spectrum from the frame and (4) time domain transformation circuitry, coupled to the frequency domain suppression filter, that transforms the frame back into a time domain, the transformed frame having an increased signal to noise ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.