Method and apparatus to encode and decode multi-channel audio signals
AssigneeKoninklijke Philips Electronics N.V.
InventorAlbertus Cornelis Den Brinker
Life of this patent
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Abstract
An encoder (100) for encoding a multi-channel audio signal comprises a prediction processor (101) for generating two residual signals for two signal components of the multi-channel signal by linear prediction which is associated with psycho-acoustic characteristics and which specifically uses psycho-acoustic prediction filters; a rotation processor (105) for rotating the combined signal of the two residual signals to generate a main signal and a side signal, in which the energy of the main signal is maximized and the energy of the side signal is minimized; an encoding processor (109) for encoding the main and preferably the side signal; and an output processor (111) for generating an output signal data, prediction parameters and rotation parameters.
Claims18
A signal encoder for encoding a multi-channel signal comprising at least a first signal component and a second signal component, the signal encoder comprising:
- predicting means for generating a first residual signal of the first signal component and a second residual signal of the second signal component by linear prediction of the first signal component and the second signal component, the linear prediction being associated with psycho-acoustic characteristics;
- rotation means for generating a main signal and a side signal by rotation of a combined signal comprising the first residual signal and the second residual signal, the main signal having a higher signal energy than the side signal;
- first encoding means for encoding the main signal to generate encoded main data;
- and
- output means for generating an output signal comprising the encoded main data.
A signal decoder for decoding a multi-channel signal, the signal decoder comprising:
- receiving means for receiving a multi-channel signal;
- rotation means for generating a first residual signal and a second residual signal by rotation of the multi channel signal;
- and
- synthesis means for generating an output multi-channel signal by linear prediction in response to the first residual signal and the second residual signal, the linear prediction being associated with psycho-acoustic characteristics.
A method of encoding a multi-channel signal comprising at least a first signal component and a second signal component, the method comprising the steps of:
- generating a first residual signal of the first signal component and a second residual signal of the second signal component by linear prediction of the first signal component and the second signal component, the linear prediction being associated with psycho-acoustic characteristics;
- generating a main signal and a side signal by rotation of a combined signal comprising the first residual signal and the second residual signal, the main signal having a higher signal energy than the side signal;
- encoding the main signal to generate encoded main data;
- and
- generating an output signal comprising the encoded main data.
A method of decoding a multi-channel signal, the method comprising the steps of:
- receiving a multi-channel signal;
- generating a first residual signal and a second residual signal by rotation of the multi-channel signal;
- and
- generating an output multi-channel signal by linear prediction in response to the first residual signal and the second residual signal, the linear prediction being associated with psycho-acoustic characteristics.
A computer-readable storage medium having recorded thereon a data stream comprising encoded data for a multi-channel signal, the data stream comprising:
- linear prediction parameters indicative of a linear prediction of a first signal component and a second signal component of the multi-channel signal;
- a rotation parameter indicative of a rotation value between a main signal and a combined signal comprising a first residual signal associated with the linear prediction of the first signal component and a second residual signal associated with the linear prediction of the second signal component;
- and
- encoded main data of the main signal.
Dependencies are inferred from the claim text.