SIGNAL PROCESSING APPARATUS AND SIGNAL PROCESSING METHOD, ENCODER AND ENCODING METHOD, DECODER AND DECODING METHOD, AND PROGRAM

• US 20170236530A1
• Filed: 05/02/2017
• Published: 08/17/2017
• Est. Priority Date: 04/13/2010
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Yamamoto, Yuki, Chinen, Toru, Honma, Hiroyuki, Mitsufuji, Yuhki
• Granted Patent: US 10,224,054 B2
• Time in Patent Office: Days
• CPC Class Codes: G10L 19/0204 using subband decomposition
• CPC Class Codes: G10L 19/0208 Subband vocoders
• 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 21/038 using band spreading techniques
• CPC Class Codes: G10L 21/0388 Details of processing therefor

Abstract

Methods and apparatus for performing signal processing. The signal processing comprises demultiplexing input encoded data into data including information for a segment including frames and coefficient information for a coefficient selected in the frames of the segment, and low band encoded data, decoding the low band encoded data to produce a low band signal, selecting a coefficient of a frame to be processed from a plurality of the coefficients based on the data, calculating a high band sub-band power of a high band sub-band signal of each sub-band constituting a high band signal of the frame to be processed based on a low band sub-band signal of each sub-band constituting the low band signal of the frame to be processed and the selected coefficient, and producing the high band signal of the frame to be processed based on the high band sub-band power and the low band sub-band signal.

Claims

1-23. -23. (canceled)

24. A decoder comprising:

a demultiplexing circuit configured to demultiplex input encoded data into high band encoded data and low band encoded data, wherein the high band encoded data includes segment information for segments,

wherein each of the segments includes a plurality of frames associated with a same coefficient,

wherein the segment information includes information of a number of segments, a length of each segment, and coefficient information for the plurality of frames;

a low band decoding circuit configured to decode the low band encoded data to produce a low band signal;

a selection circuit configured to select a coefficient from a plurality of the coefficients specified in the coefficient information included in the high band encoded data;

a high band sub-band power calculation circuit configured to calculate a high band sub-band power of a high band sub-band signal based on a low band sub-band signal of a plurality of sub-bands constituting the low band signal and the selected coefficient;

a high band signal production circuit configured to produce a high band signal based on the high band sub-band power and the low band sub-band signal; and

a synthesis circuit configured to synthesize the low band signal and the high band signal to produce an output signal.

25. A method of decoding, the method comprising:

demultiplexing input encoded data into high band encoded data and low band encoded data, wherein the high band encoded data includes segment information for segments, wherein each of the segments includes a plurality of frames associated with a same coefficient, wherein the segment information includes information of a number of segments, a length of each segment, and coefficient information for the plurality of frames;

decoding the low band encoded data to produce a low band signal;

selecting a coefficient from a plurality of the coefficients specified in the coefficient information included in the high band encoded data;

calculating a high band sub-band power of a high band sub-band signal based on a low band sub-band signal of a plurality of sub-bands constituting the low band signal and the selected coefficient;

producing a high band signal based on the high band sub-band power and the low band sub-band signal; and

synthesizing the low band signal and the high band signal to produce an output signal.