Patent · US Active

Enhancing perceptual performance of SBR and related HFR coding methods by adaptive noise-floor addition and noise substitution limiting

US8255233B2 · kind B2 · utility

3Cited by

18References

12Claims

0Family size

Assignee

Dolby International AB · IE

Inventors

Lars G. Liljeryd · Solna, SE
Kristofer Kjoerling · Solna, SE
Per Ekstrand · Saltsjöbaden, SE
Frederik Henn · Bromma, SE

Key dates

Filing date	Sep 12, 2011
Grant date	Aug 28, 2012
Priority date	—
Expiry date	Sep 12, 2031

Classification

Technology area (CPC G)Physics
CPC primaryG10L25/18
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

Methods and an apparatus for enhancement of source coding systems utilizing high frequency reconstruction (HFR) are introduced. The problem of insufficient noise contents is addressed in a reconstructed highband, by using Adaptive Noise-floor Addition. New methods are also introduced for enhanced performance by means of limiting unwanted noise, interpolation and smoothing of envelope adjustment amplification factors. The methods and apparatus used are applicable to both speech coding and natural audio coding systems.

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