METHOD AND APPARATUS FOR ENCODING AND DECODING HIGH FREQUENCY FOR BANDWIDTH EXTENSION

• US 20160240207A1
• Filed: 04/25/2016
• Published: 08/18/2016
• 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
• Granted Patent: US 9,761,238 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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

1-4. -4. (canceled)

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

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

a processor configured to perform;

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, in response to at least one of the first determining and the second determining, an excitation class for the current frame,

wherein the second determining is performed by thresholding the tonal characteristic.

6. The apparatus of claim 5, wherein the processing device is configured to determine whether the current frame corresponds to either the noisy signal or the tonal signal by comparing the tonal characteristic with at least one threshold.

7. The apparatus of claim 5, wherein the processor is configured to generate a speech class from among a plurality of excitation classes as the excitation class for the current frame, in response to the first determining.

8. The apparatus of claim 5, wherein the processor is configured to generate either a tonal music class or a non-tonal music class from among a plurality of excitation classes as the excitation class for the current frame, in response to the second determining.

9. The apparatus of claim 5, 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.