# US 2021/0280201 A1 · Encoding device and encoding method

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- Number: US 2021/0280201 A1
- Document ID: US20210280201A1
- Status: Published application
- Kind: A1
- Application number: 17/256,899
- Filed: 2019-07-02
- Published: 2021-09-09
- Earliest claimed: 2018-07-03
- Assignees: Panasonic Intellectual Property Corporation of America
- Applicants: Panasonic Intellectual Property Corporation of America
- Inventors: Srikanth NAGISETTY; Hiroyuki EHARA; Rohith MARS; Chong Soon LIM; Toshiaki SAKURAI
- Web page: https://patentgrep.com/patent/US20210280201A1

## CPC

- G10L 19/04: using predictive techniques
- G10L 19/008: Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
- G10L 19/0212: {using orthogonal transformation}
- G10L 25/12: the extracted parameters being prediction coefficients
- G10L: SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING

## Abstract

This encoding device is able to encode an S signal efficiently in MS prediction encoding. An M signal encoding unit generates first encoding information by encoding a sum signal indicating a sum of a left channel signal and a right channel signal that constitute a stereo signal. An energy difference calculation unit calculates a prediction parameter for predicting a difference signal indicating a difference between the left channel signal and the right channel signal by using a parameter regarding an energy difference between the left channel signal and the right channel signal. An entropy encoding unit generates second encoding information by encoding the prediction parameter.

## Claims

### Claim 1

An encoder, comprising:
first encoding circuitry, which, in operation, encodes a sum signal to generate first encoding information, the sum signal indicating a sum of a left channel signal and a right channel signal constituting a stereo signal;
calculation circuitry, which, in operation, calculates a prediction parameter using a parameter relating to an energy difference between the left channel signal and the right channel signal, the prediction parameter being a parameter for predicting a difference signal indicating a difference between the left channel signal and the right channel signal; and
second encoding circuitry, which, in operation, encodes the prediction parameter to generate second encoding information.

### Claim 2 (depends on 1)

The encoder according to claim 1, further comprising:
prediction circuitry, which, in operation, predicts the difference signal using the prediction parameter and the sum signal to generate a prediction difference signal; and
third encoding circuitry, which, in operation, encodes a residual signal between the difference signal and the prediction difference signal to generate third encoding information.

### Claim 3 (depends on 2)

The encoder according to claim 2, wherein
the third encoding information includes an encoding result of encoding of a residual signal between the sum signal and a decoded sum signal obtained by decoding the first encoding information.

### Claim 4 (depends on 1)

The encoder according to claim 1, wherein
the parameter relating to the energy difference is a coefficient obtained by normalizing, by energy of a decoded sum signal obtained by decoding the first encoding information, a correlation value between the decoded sum signal and the difference signal.

### Claim 5 (depends on 1)

The encoder according to claim 1, wherein
the second encoding circuitry performs entropy encoding on the prediction parameter.

### Claim 6

An encoding method, comprising:
encoding a sum signal to generate first encoding information, the sum signal indicating a sum of a left channel signal and a right channel signal constituting a stereo signal;
calculating a prediction parameter using a parameter relating to an energy difference between the left channel signal and the right channel signal, the prediction parameter being a parameter for predicting a difference signal indicating a difference between the left channel signal and the right channel signal; and
encoding the prediction parameter to generate second encoding information.