Patent · US Active

Temporal interpolation of adjacent spectra

US9129608B2 · kind B2 · utility

0Cited by

8References

17Claims

0Family size

Assignee

Nuance Communications, Inc. · US

Inventors

Mohamed Krini · Ulm, DE
Gerhard Uwe Schmidt · Ulm, DE
Bernd Iser · Ulm, DE
Arthur Wolf · Neu-Ulm, DE

Key dates

Filing date	Mar 6, 2013
Grant date	Sep 8, 2015
Priority date	—
Expiry date	May 11, 2033

Classification

Technology area (CPC G)Physics
CPC primaryG10L2021/02082
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

Embodiments of the present invention exploit redundancy of succeeding FFT spectra and use this redundancy for computing interpolated temporal supporting points. An analysis filter bank converts overlapped sequences of an audio (ex. loudspeaker) signal from a time domain to a frequency domain to obtain a time series of short-time loudspeaker spectra. An interpolator temporally interpolates this time series. The interpolation is fed to an echo canceller, which computes an estimated echo spectrum. A microphone analysis filter bank converts overlapped sequences of an audio microphone signal from the time domain to the frequency domain to obtain a time series of short-time microphone spectra. The estimated echo spectrum is subtracted from the microphone spectrum. Further signal enhancement (filtration) may be applied. A synthesis filter bank converts the filtered microphone spectra to the time domain to generate an echo compensated audio microphone signal. Computational complexity of signal processing systems can, therefore, be reduced.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.