Method and apparatus for encoding and decoding high frequency for bandwidth extension

Patent metadata

Field	Value
Publication number	US-9378746-B2
Application number	US-201313848177-A
Country	US
Kind code	B2
Filing date	Mar 21, 2013
Priority date	Mar 21, 2012
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

Disclosed are a method and apparatus for encoding and decoding a high frequency for bandwidth extension. The method includes: estimating a weight; and generating a high frequency excitation signal by applying the weight between random noise and a decoded low frequency spectrum.

First claim

What is claimed is:

1. A method of generating an excitation class, the method including:
receiving audio from an input device;
first determining, based on a result of signal classification, whether a current frame of the audio corresponds to a speech signal;
when the current frame does not correspond to the speech signal, second determining, based on a tonal characteristic, whether the current frame corresponds to one of a noisy signal and a tonal signal; and
generating, based on a result of the first determining and the second determining, an excitation class for the current frame,
wherein the excitation class for the current frame is one of a plurality of excitation classes,
wherein the plurality of excitation classes include a speech class, a tonal music class, and a non-tonal music class.

2. The method of claim 1 , wherein the second determining is performed by comparing the tonal characteristic with a threshold.

3. The method of claim 1 , wherein the generating the excitation class comprises generating, in response to the first determining, the speech class.

4. The method of claim 1 , wherein the generating the excitation class comprises generating, in response to the second determining, the tonal music class and the non-tonal music class.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Choo Ki-Hyun

Classifications

• G10L19/008 Primary

  Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing · CPC title

• G10L21/0388

  Details of processing therefor · CPC title

• G10L19/08

  Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters · CPC title

• G10L19/02 Primary

  using spectral analysis, e.g. transform vocoders or subband vocoders · CPC title

• G10L21/038

  using band spreading techniques · CPC title