Multichannel audio signal processing method and device
AssigneeElectronics and Telecommunications Research Institute
InventorsSeung Kwon Beack, Jeong Il Seo, Jong Mo Sung, Tae Jin Lee, Dae Young Jang, Jin Woong Kim
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Abstract
Disclosed are a multi-channel audio signal processing method and a multi-channel audio signal processing apparatus. The multi-channel audio signal processing method may generate N channel output signals from N/2 channel downmix signals based on an N-N/2-N structure.
Claims20
A method of processing a multi-channel audio signal, the method comprising:
- identifying a residual signal and N/2 channel downmix signals generated from N channel input signals;
- applying the N/2 channel downmix signals and the residual signal to a first matrix;
- outputting a first signal that is input to each of N/2 decorrelators corresponding to N/2 one-to-two (OTT) boxes through the first matrix and a second output signal that is transmitted to a second matrix without being input to the N/2 decorrelators;
- outputting a decorrelated signal from the first signal through the N/2 decorrelators;
- applying the decorrelated signal and the second signal to the second matrix;
- and
- generating N channel output signals through the second matrix.
A method of processing a multi-channel audio signal, the method comprising:
- identifying N/2 channel downmix signals and N/2 channel residual signals;
- generating N channel output signals by inputting the N/2 channel downmix signals and the N/2 channel residual signals to N/2 one-to-two (OTT) boxes,
- wherein the N/2 OTT boxes are disposed in parallel without mutual connection,
- an OTT box to output a Low Frequency Enhancement (LFE) channel among the N/2 OTT boxes is configured to:
- (1) receive a downmix signal aside from a residual signal,
- (2) use a Channel Level Difference (CLD) parameter between the CLD parameter and an Inter channel Correlation/Coherence (ICC) parameter, and
- (3) not output a decorrelated signal through a decorrelator.
An apparatus for processing a multi-channel audio signal, the apparatus comprising:
- a processor configured to perform a multi-channel audio signal processing method,
- wherein the multi-channel audio signal processing method comprises:
- identifying a residual signal and N/2 channel downmix signals generated from N channel input signals;
- applying the N/2 channel downmix signals and the residual signal to a first matrix;
- outputting a first signal that is input to each of N/2 decorrelators corresponding to N/2 one-to-two (OTT) boxes through the first matrix and a second output signal that is transmitted to a second matrix without being input to the N/2 decorrelators;
- outputting a decorrelated signal from the first signal through the N/2 decorrelators;
- applying the decorrelated signal and the second signal to the second matrix;
- and
- generating N channel output signals through the second matrix.
An apparatus for processing a multi-channel audio signal, the apparatus comprising:
- a processor configured to perform a multi-channel audio signal processing method,
- wherein the multi-channel audio signal processing method comprises:
- identifying N/2 channel downmix signals and N/2 channel residual signals;
- generating N channel output signals by inputting the N/2 channel downmix signals and the N/2 channel residual signals to N/2 one-to-two (OTT) boxes,
- the N/2 OTT boxes are disposed in parallel without mutual connection, and
- an OTT box to output a Low Frequency Enhancement (LFE) channel among the N/2 OTT boxes is configured to:
- (1) receive a downmix signal aside from a residual signal,
- (2) use a Channel Level Difference (CLD) parameter between the CLD parameter and an Inter channel Correlation/Coherence (ICC) parameter, and
- (3) not output a decorrelated signal through a decorrelator.
Dependencies are inferred from the claim text.