Paketverlustverdeckung für Kritisch Abgetastete Filterbankbasierte Codecs mit Multisinusdetektion

Details

Veröffentlichungs-Nr.

EP3454336

Aktenzeichen

EP18193942

Anmeldetag

12. September 2018

Veröffentlichung

4. November 2020

Erteilung

4. November 2020

Rechtsraum

EP

IPC

G10L19/005// G10L25/12G10L25/18G10L19/02

Abstract

Systems and methods are described for concealing packet loss in a received audio stream. Candidate frequency lines may be identified within one or two previous frames of the audio stream. For two-frame concealment, gains may be calculated for each candidate frequency line between a first frame and a second frame, and candidate frequency lines may be selected based on the calculated gains. Different techniques may be used to select the candidate frequency lines, including a full-search method and a hybrid method based on selecting peaks from a pseudospectrum. Sub-band predictors may be selected from a database of predictor candidates based on the selected candidate frequency lines. Each predictor may be a function of frequency, and the selected predictors may be arranged as a matrix. The sub-band predictors may then be applied to corresponding blocks of the second frame to obtain sub-band coefficients used to reconstruct the lost frame.

Anmelder

Firmen

Dolby Laboratories Licensing Corporation
Dolby International AB
Dolby Laboratories Licensing Corp.

Land

🇺🇸 USA

Fachgebiete