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

• US 9,761,238 B2
• Filed: 04/25/2016
• Issued: 09/12/2017
• Est. Priority Date: 03/21/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Choo, Ki-hyun
• Primary Examiner(s): YEN, ERIC L
• Application Number:
  US15/137,030
• Publication Number:
  US 20160240207A1
• Time in Patent Office: 505 Days
• CPC Class Codes: G10L 19/008 Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
• CPC Class Codes: G10L 19/02 using spectral analysis, e.g. transform vocoders or subband vocoders
• CPC Class Codes: G10L 19/08 Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
• CPC Class Codes: G10L 19/18 Vocoders using multiple modes
• CPC Class Codes: G10L 19/20 using sound class specific coding, hybrid encoders or object based coding
• CPC Class Codes: G10L 19/22 Mode decision, i.e. based on audio signal content versus external parameters
• CPC Class Codes: G10L 21/038 using band spreading techniques
• CPC Class Codes: G10L 21/0388 Details of processing therefor

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.

Claims

1. An apparatus for generating an excitation class, the apparatus including:

a receiving unit configured to receive an audio signal from an input device; and

a processor configured to;

determine, based on a result of signal classification, whether a current frame of the audio signal corresponds to a speech signal;

generate a first excitation class information for the current frame, in response that the current frame corresponds to the speech signal;

when the current frame of the audio signal does not correspond to the speech signal, obtain a tonal characteristic of the current frame;

generate a second excitation class information for the current frame by comparing the tonal characteristic with a threshold; and

generate a bitstream including either the first excitation class information or the second excitation class information;

wherein the first excitation class information indicates that a class of the current frame is a speech class, and

wherein the second excitation class information indicates whether a class of the current frame is a first non-speech class or a second non-speech class.

2. The apparatus of claim 1, wherein the processor is configured to determine the second excitation class information for the current frame based on whether the current frame corresponds to either a noisy signal or a tonal signal, by comparing the tonal characteristic with the threshold, when the current frame of the audio signal does not correspond to the speech signal.