US 2022/0101862 A1Published application

Encoding and decoding method, decoding method, apparatuses therefor and program

AssigneeNippon Telegraph and Telephone Corporation

InventorsTakehiro MORIYA, Yutaka KAMAMOTO, Ryosuke SUGIURA

Life of this patent

Estimating the term…

Loading patent…

Abstract

A technique is provided that can reduce degradation of the sound quality due to a tandem connection of paired coding and decoding, and can reduce the operation processing amount and the required memory amount of a multipoint control unit. At a terminal of a communication network having a larger communication capacity in multipoint connection between terminals in a plurality of communication networks (e.g., a fixed phone line and a mobile phone line) having different communication capacities, a multichannel coding including a monaural coding scheme of the communication network having the smaller communication capacity is performed on the coding side, whereas decoding of a multichannel-coded code of one point, decoding of a monaural-coded code of one point, or decoding of a monaural-coded code of a plurality of points is performed on the decoding side in accordance with the input code.

Claims10

Dependent claims

A coding and decoding method for a terminal apparatus used for multipoint phone connection, the method comprising:

a coding step of, for a predetermined time period, obtaining a monaural code by coding a mixed signal of input sound signals of C channels (C is an integer of 2 or greater) by a first coding scheme, obtaining an extension code including a code representing information corresponding to a difference between the input sound signals of C channels, and outputting the monaural code and the extension code as codes representing a sound signal;
and
a decoding step of,
for a time period in which an input code representing a sound signal is a pair of a monaural code and an extension code corresponding to a sound signal of one point, obtaining a provisional decoded sound signal by decoding the monaural code included in the input code representing a sound signal which is the pair by a first decoding scheme corresponding to the first coding scheme, obtaining decoded difference information from the extension code included in the input code representing a sound signal which is the pair, and obtaining C decoded sound signals from the provisional decoded sound signal and the decoded difference information by regarding the provisional decoded sound signal as a mixed signal of the C decoded sound signals and regarding the decoded difference information as information corresponding to a difference between the C decoded sound signals, and outputting the C decoded sound signals,
for a time period in which an input code representing a sound signal is one monaural code corresponding to a sound signal of one point, obtaining one decoded sound signal by decoding the one monaural code by the first decoding scheme and outputting the one decoded sound signal, and
for a time period in which an input code representing a sound signal is k monaural codes corresponding to sound signals of k points (k is an integer of 2 or greater), obtaining k decoded sound signals by decoding each of the k monaural codes by the first decoding scheme and outputting the decoded k sound signals.

3 more elements

A decoding method for a terminal apparatus used for multipoint phone connection, the method comprising a decoding step of,

for a time period in which an input code representing a sound signal is a pair of a monaural code and an extension code corresponding to a sound signal of one point, obtaining a provisional decoded sound signal by decoding the monaural code included in the input code representing a sound signal which is the pair by a first decoding scheme, obtaining decoded difference information from the extension code included in the input code representing a sound signal which is the pair, and obtaining C decoded sound signals (C is an integer of 2 or greater) from the provisional decoded sound signal and the decoded difference information by regarding the provisional decoded sound signal as a mixed signal of the C decoded sound signals and regarding the decoded difference information as information corresponding to a difference between the C decoded sound signals, and outputting the C decoded sound signals,
for a time period in which an input code representing a sound signal is one monaural code corresponding to a sound signal of one point, obtaining one decoded sound signal by decoding the one monaural code by the first decoding scheme and outputting the one decoded sound signal, and
for a time period in which an input code representing a sound signal is k monaural codes corresponding to sound signals of k points (k is an integer of 2 or greater), obtaining k decoded sound signals by decoding each of the k monaural codes by the first decoding scheme and outputting the decoded k sound signals.

A coding and decoding apparatus provided in a terminal apparatus for multipoint phone connection, the apparatus comprising:

processing circuitry configured to, for a predetermined time period, obtain a monaural code by coding a mixed signal of input sound signals of C channels (C is an integer of 2 or greater) by a first coding scheme, obtain an extension code including a code representing information corresponding to a difference between the input sound signals of C channels, and output the monaural code and the extension code as codes representing a sound signal,
wherein the processing circuitry is configured to,
for a time period in which an input code representing a sound signal is a pair of a monaural code and an extension code corresponding to a sound signal of one point, obtain a provisional decoded sound signal by decoding the monaural code included in the input code representing a sound signal which is the pair by a first decoding scheme corresponding to the first coding scheme, obtain decoded difference information from the extension code included in the input code representing a sound signal which is the pair, and obtain C decoded sound signals from the provisional decoded sound signal and the decoded difference information by regarding the provisional decoded sound signal as a mixed signal of the C decoded sound signals and regarding the decoded difference information as information corresponding to a difference between the C decoded sound signals, and output the C decoded sound signals,
for a time period in which an input code representing a sound signal is one monaural code corresponding to a sound signal of one point, obtain one decoded sound signal by decoding the one monaural code by the first decoding scheme and output the one decoded sound signal, and
for a time period in which an input code representing a sound signal is k monaural codes corresponding to sound signals of k points (k is an integer of 2 or greater), obtain k decoded sound signals by decoding each of the k monaural codes by the first decoding scheme and output the decoded k sound signals.

2 more elements

A decoding apparatus provided in a terminal apparatus used for multipoint phone connection, the decoding apparatus comprising processing circuitry configured to,

for a time period in which an input code representing a sound signal is a pair of a monaural code and an extension code corresponding to a sound signal of one point, obtain a provisional decoded sound signal by decoding the monaural code included in the input code representing a sound signal which is the pair by a first decoding scheme, obtain decoded difference information from the extension code included in the input code representing a sound signal which is the pair, and obtain C decoded sound signals (C is an integer of 2 or greater) from the provisional decoded sound signal and the decoded difference information by regarding the provisional decoded sound signal as a mixed signal of the C decoded sound signals and regarding the decoded difference information as information corresponding to a difference between the C decoded sound signals, and output the C decoded sound signals,
for a time period in which an input code representing a sound signal is one monaural code corresponding to a sound signal of one point, obtain one decoded sound signal by decoding the one monaural code by the first decoding scheme and output the one decoded sound signal, and
for a time period in which an input code representing a sound signal is k monaural codes corresponding to sound signals of k points (k is an integer of 2 or greater), obtain k decoded sound signals by decoding each of the k monaural codes by the first decoding scheme and output the decoded k sound signals.

Dependencies are inferred from the claim text.

Facts

Application: 17/422,692Filed 7 Jan 2020
Priority: JP 2019-00630517 Jan 2019
Published: 31 Mar 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

G10L 19/008
Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals,…:…
G10L 19/005
Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals,…:…
G10L 19/18
Vocoder architecture: vocoders using multiple modes
H04L 65/70
Network streaming of media packets: media network packetisation