Energy lossless-encoding method and apparatus, audio encoding method and apparatus, energy lossless-decoding method and apparatus, and audio decoding method and apparatus

• US 10,878,827 B2
• Filed: 07/30/2019
• Issued: 12/29/2020
• Est. Priority Date: 10/21/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Choo, Ki-Hyun, Oh, Eun-Mi
• Primary Examiner(s): Tzeng, Feng-Tzer
• Application Number:
  US16/526,430
• Publication Number:
  US 20190355367A1
• Time in Patent Office: 518 Days
• CPC Class Codes: G10L 19/00 Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis in musical instruments G10H
• CPC Class Codes: G10L 19/0017 Lossless audio signal coding; Perfect reconstruction of coded audio signal by transmission of coding error G10L19/24 takes precedence
• CPC Class Codes: G10L 19/0204 using subband decomposition
• CPC Class Codes: G10L 19/032 Quantisation or dequantisation of spectral components
• CPC Class Codes: G10L 19/035 Scalar quantisation
• CPC Class Codes: G10L 21/00 Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility G10L19/00 takes precedence

Abstract

A lossless encoding method is provided that includes determining a lossless encoding mode of a quantization coefficient as one of an infinite-range lossless encoding mode and a finite-range lossless encoding mode; encoding the quantization coefficient in the infinite-range lossless encoding mode in correspondence with a result of the lossless encoding mode determination; and encoding the quantization coefficient in the finite-range lossless encoding mode in correspondence with a result of the lossless encoding mode determination.

Claims

1. A method for coding an envelope of a signal including at least one of audio and speech, the method comprising:

determining a coding method among a first coding method and a second coding method for encoding differential quantization indices of bands in a frame;

encoding the differential quantization indices using the determined coding method; and

generating a bitstream to be sent for decoding into reconstructed signal including at least one of audio and speech,

wherein the determining the coding method comprises;

determining the first coding method when at least one differential quantization index is not represented by a specific range; and

when the differential quantization indices are represented by the specific range, selecting one Huffman coding mode from a context based Huffman coding mode and a resized Huffman coding mode in the second coding method, based on a comparison result of a bit consumption for encoding the differential quantization indices,

wherein in the context based Huffman coding mode, a context of a current band is obtained by using a differential quantization index of a previous band, and a differential quantization index of the current band is Huffman encoded based on the context of the current band,

wherein in the resized Huffman coding mode, the context of the current band is not obtained, and the differential quantization index of the current band is Huffman encoded without the context of the current band,

wherein in the context based Huffman coding mode or the resized Huffman coding mode, bits representing each of the differential quantization indices are split into upper bits and a lower bit and the upper bits are Huffman encoded, and the lower bit is processed by bit packing without Huffman encoding, and

wherein the upper bits and the lower bit do not comprise a bit indicating the determined coding method among the first coding method and the second coding method, and a bit indicating the one Huffman coding mode from the context based Huffman coding mode and the resized Huffman coding mode.

2. The method of claim 1, wherein the coding method is determined on a frame by frame basis.

3. The method of claim 1, wherein the differential quantization indices are associated with energy of the signal.

4. A method for decoding an envelope of a signal including at least one of audio and speech, the method comprising:

receiving a bitstream including encoded differential quantization indices of bands in a frame from an encoding side;

determining a decoding method among a first decoding method and a second decoding method based on a bit indicating the decoding method among the first decoding method and the second decoding method included in the bitstream;

decoding the encoded differential quantization indices by using the determined decoding method; and

generating reconstructed signal including at least one of audio and speech based on the received bitstream,

wherein the first decoding method is allowed when at least one differential quantization index is not represented by a specific range,

wherein when the differential quantization indices are represented by the specific range, one Huffman decoding mode from a context based Huffman decoding mode and a resized Huffman decoding mode in the second decoding method is selected for decoding the differential quantization indices,

wherein in the context based Huffman decoding mode, a context of a current band is obtained by using a decoded differential quantization index of a previous band, and an encoded differential quantization index of the current band is Huffman decoded based on the context of the current band,

wherein in the resized Huffman decoding mode, the context of the current band is not obtained, and the encoded differential quantization index of the current band is Huffman decoded without the context of the current band,

wherein in the context based Huffman decoding mode or the resized Huffman decoding mode, upper bits representing each of the encoded differential quantization indices are decoded by Huffman decoding and a lower bit representing each of the encoded differential quantization indices is unpacked without the Huffman decoding,

wherein a bit consumption for decoding the differential quantization indices in the selected one Huffman decoding mode is less than a bit consumption for decoding the differential quantization indices in other Huffman decoding mode, and

wherein the upper bits and the lower bit do not comprise the bit indicating the determined decoding method among the first decoding method and the second decoding method, and a bit indicating the one Huffman decoding mode from the context based Huffman decoding mode and the resized Huffman decoding mode.