Multichannel signal processing method, and multichannel signal processing apparatus for performing the method

Patent metadata

Field	Value
Publication number	US-10638243-B2
Application number	US-201916290469-A
Country	US
Kind code	B2
Filing date	Mar 1, 2019
Priority date	Feb 17, 2015
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

Provided are an encoding method of a multichannel signal, an encoding apparatus to perform the encoding method, a multichannel signal processing method, and a decoding apparatus to perform the decoding method. The decoding method may include identifying an N/2-channel downmix signal derived from an N-channel input signal; and generating an N-channel output signal from the identified N/2-channel downmix signal using a plurality of one-to-two (OTT) boxes. If a low frequency effect (LFE) channel is absent in the output signal, the number of OTT boxes may be equal to N/2 where N/2 denotes the number of channels of the downmix signal.

First claim

What is claimed is:

1. A multichannel signal processing method performed by a processor of multichannel signal processing apparatus comprising:
identifying, by the processor, an N/2-channel downmix signal derived from an N-channel input signal; and
generating, by the processor, an N-channel output signal from the identified N/2-channel downmix signal using a plurality of one-to-two (OTT) boxes implemented by a first program code performed in the processor,
in response to the number of channels of the output signal exceeding a predetermined number of channels, decorrelators implemented by a second program code performed in the processor are reused,
wherein N denoting the number of channels of the output signal is an even number more than 1.

2. The multichannel signal processing method of claim 1 , wherein, if a low frequency effect (LFE) channel is absent in the output signal, a maximum number of N/2 decorrelators are used.

3. The multichannel signal processing method of claim 2 , wherein an OTT box from which an LFE channel is output, each of the plurality of OTT boxes generates a 2-channel output signal using 1-channel downmix signal and CLD.

4. The multichannel signal processing method of claim 1 , wherein the number of a plurality OTT boxes to be used for generating the N-channel output signal is equal to N/2.

5. The multichannel signal processing method of claim 1 , wherein an OTT box from which an LFE channel is not output, generates a 2-channel output signal using residual signal, 1-channel downmix signal, CLD and ICC.

6. The multichannel signal processing method of claim 1 , wherein the generating of the N-channel output signal includes generating the N-channel output signal using a pre-decorrelator matrix M 1 and a mix matrix M 2 .

7. The multichannel signal processing method of claim 1 , wherein each of the plurality of OTT boxes generates the N-channel output signal using a channel level difference (CLD).

8. A multichannel signal processing method performed by a processor of multichannel signal processing apparatus comprising:
decoding, by the processor, an N/2-channel downmix signal encoded based on a first coding scheme; and
generating, by the processor, an N-channel output signal from the N/2-channel downmix signal based on a second coding scheme,
in response to the number of channels of the output signal exceeding a predetermined number of channels, decorrelators implemented by a program code performed in the processor are reused,
wherein N denoting the number of channels of the output signal is an even number more than 1.

9. A multichannel signal processing apparatus comprising a processor to implement a multichannel signal processing method, wherein the processor is configured to
identify an N/2-channel downmix signal derived from an N-channel input signal, and
generate an N-channel output signal from the identified N/2-channel downmix signal using a plurality of one-to-two (OTT) boxes implemented by a first program code performed in the processor, and
in response to a low frequency effect (LFE) channel being absent in the output signal, a maximum number of N/2 decorrelators implemented by a second program code performed in the processor are used,
wherein N denoting the number of channels of the output signal is an even number more than 1.

10. The multichannel signal processing method of claim 9 , wherein the number of a plurality OTT boxes to be used for generating the N-channel output signal is equal to N/2.

11. The multichannel signal processing apparatus of claim 9 , wherein an OTT box from which an LFE channel is not output generates a 2-channel output signal using residual signal, 1-channel downmix signal, CLD and ICC.

12. The multichannel signal processing apparatus of claim 9 , wherein an OTT box from which an LFE channel is output,
each of the plurality of OTT boxes generates a 2-channel output signal using 1-channel downmix signal and CLD.

13. The multichannel signal processing apparatus of claim 9 , wherein the processor is configured to generate the N-channel output signal using a pre-decorrelator matrix) M 1 and a mix matrix M 2 .

14. The multichannel signal processing apparatus of claim 9 , wherein each of the plurality of OTT boxes generates the N-channel output signal using a channel level difference (CLD).

Assignees

• Electronics & Telecommunications Res Inst

Inventors

• Beack Seung Kwon
• Seo Jeong Il
• Sung Jong Mo
• Lee Tae Jin
• Jang Dae Young
• Choi Jin Soo

Classifications

• H04S2420/03

  Application of parametric coding in stereophonic audio systems · CPC title

• H04S3/02

  of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other · CPC title

• H04S1/007 Primary

  in which the audio signals are in digital form (data reduction aspects thereof based on psychoacoustics G10L19/02) · CPC title

• H04S2400/07

  Generation or adaptation of the Low Frequency Effect [LFE] channel, e.g. distribution or signal processing · CPC title

• H04S2400/03

  Aspects of down-mixing multi-channel audio to configurations with lower numbers of playback channels, e.g. 7.1 -> 5.1 (H04S2400/01 takes precedence) · CPC title