Invention Application
- Patent Title: Efficient Combined Harmonic Transposition
- Patent Title (中): 有效的组合谐波转置
-
Application No.: US13321910Application Date: 2010-05-25
-
Publication No.: US20120065983A1Publication Date: 2012-03-15
- Inventor: Per Ekstrand , Lars Villemoes , Per Hedelin
- Applicant: Per Ekstrand , Lars Villemoes , Per Hedelin
- Applicant Address: NL Amsterdam Zuid-oost
- Assignee: DOLBY INTERNATIONAL AB
- Current Assignee: DOLBY INTERNATIONAL AB
- Current Assignee Address: NL Amsterdam Zuid-oost
- International Application: PCT/EP2010/057176 WO 20100525
- Main IPC: G10L19/00
- IPC: G10L19/00

Abstract:
The present document relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR), and to digital effect processors, e.g. so-called exciters, where generation of harmonic distortion adds brightness to the processed signal. In particular; a system configured to generate a high frequency component of a signal from a low frequency component of the signal is described, The system may comprise an analysis filter bank (501) configured to provide a set of analysis subband signals from the low frequency component of the signal; wherein the set of analysis subband signals comprises at least two analysis subband signals; wherein the analysis filter bank (501) has a frequency resolution of Δf, The system further comprises a nonlinear processing unit (502) configured to determine a set of synthesis subband signals from the set of analysis subband signals using a transposition order P; wherein the set of synthesis subband signals comprises a portion of the set of analysis subband signals phase shifted by an amount derived from the transposition order P; and a synthesis filter bank (504) configured to generate the high frequency component of the signal from the set of synthesis subband signals; wherein the synthesis filter bank (504) has a frequency resolution of FΔf; with F being a resolution factor, with F≧1; wherein the transposition order P is different from the resolution factor F.
Public/Granted literature
- US08983852B2 Efficient combined harmonic transposition Public/Granted day:2015-03-17
Information query