SIGNAL ENCODING METHOD AND APPARATUS AND SIGNAL DECODING METHOD AND APPARATUS

• US 20170223356A1
• Filed: 07/28/2015
• Published: 08/03/2017
• Est. Priority Date: 07/28/2014
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: OH, Eun-mi, SUNG, Ho-sang, CHOO, Ki-hyun
• Granted Patent: US 10,194,151 B2
• Time in Patent Office: Days
• CPC Class Codes: G10L 19/0212 using orthogonal transformation
• CPC Class Codes: G10L 19/032 Quantisation or dequantisation of spectral components
• CPC Class Codes: G10L 19/167 Audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission or storage purposes
• CPC Class Codes: G10L 19/24 Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding
• CPC Class Codes: H03M 13/05 using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits H03M13/2906 takes precedence
• CPC Class Codes: H03M 13/156 Encoding or decoding using time-frequency transformations, e.g. fast Fourier transformation
• CPC Class Codes: H03M 13/31 combining coding for error detection or correction and efficient use of the spectrum without error detection or correction H03M5/14 , H03M5/145
• CPC Class Codes: H04N 19/124 Quantisation
• CPC Class Codes: H04N 19/196 being specially adapted for the computation of encoding parameters, e.g. by averaging previously computed encoding parameters processing of motion vectors H04N19/513
• CPC Class Codes: H04N 19/40 using video transcoding, i.e. partial or full decoding of a coded input stream followed by re-encoding of the decoded output stream

Abstract

A spectrum coding method includes quantizing spectral data of a current band based on a first quantization scheme, generating a lower bit of the current band using the spectral data and the quantized spectral data, quantizing a sequence of lower bits including the lower bit of the current band based on a second quantization scheme, and generating a bitstream based on a upper bit excluding N bits, where N is 1 or greater, from the quantized spectral data and the quantized sequence of lower bits.

Claims

1. A spectrum coding method comprising:

quantizing spectral data of a current band based on a first quantization scheme;

generating a lower bit of the current band using the spectral data and the quantized spectral data;

quantizing a sequence of lower bits including the lower bit of the current band based on a second quantization scheme; and

generating a bitstream based on a upper bit excluding N bits, where N is 1 or greater, from the quantized spectral data and the quantized sequence of lower bits.

2. The method of claim 1, wherein the first quantization scheme is based on scalar quantization.

3. The method of claim 2, wherein the scalar quantization uses a uniform quantization step size.

4. The method of claim 1, wherein the quantizing a sequence of lower bits is performed based on a difference between the spectral data and the quantized spectral data.

5. The method of claim 1, wherein the second quantization scheme is based on trellis coded quantization.

6. The method of claim 1, wherein a bandwidth of the spectral data is either a super wide band or a full band.

7. The method of claim 1, wherein the spectral data is obtained by performing modified discrete cosine transform and normalization on an input audio signal.

8. The method of claim 1, wherein the spectral data is coded in a normal mode.