Decoding of audio scenes
AssigneeDolby International AB
InventorsHeiko PURNHAGEN, Lars VILLEMOES, Leif Jonas SAMUELSSON, Toni HIRVONEN
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Abstract
Exemplary embodiments provide encoding and decoding methods, and associated encoders and decoders, for encoding and decoding of an audio scene which is represented by one or more audio signals. The encoder generates a bit stream which comprises downmix signals and side information which includes individual matrix elements of a reconstruction matrix which enables reconstruction of the one or more audio signals in the decoder.
Claims21
A method for decoding an audio scene represented by N audio signals, the method comprising:
- receiving a bit stream comprising M downmix signals and matrix elements of a reconstruction matrix;
- generating the reconstruction matrix using the matrix elements;
- and
- reconstructing the N audio signals from the M downmix signals using the reconstruction matrix, wherein approximations of the N audio signals are obtained as linear combinations of the M downmix signals with the matrix elements of the reconstruction matrix as coefficients in the linear combinations,
- wherein M is less than N, and M is equal or greater than one.
An apparatus for decoding an audio scene represented by N audio signals, the apparatus comprising:
- a receiver configured to receive a bit stream comprising M downmix signals and matrix elements of a reconstruction matrix;
- and
- an audio decoder processor configured to receive the matrix elements from the receiver and based on the matrix elements generate the reconstruction matrix, the audio decoder processor further configured to receive the reconstruction matrix from the reconstruction matrix generator and reconstruct the N audio signals from the M downmix signals using the reconstruction matrix,
- wherein approximations of the N audio signals are obtained as linear combinations of the M downmix signals with the matrix elements of the reconstruction matrix as coefficients in the linear combinations,
- wherein M is less than N, and M is equal or greater than one.
An apparatus for decoding an audio scene represented by N audio signals, the apparatus comprising:
- a receiver configured to receive a bit stream comprising M downmix signals and matrix elements of a reconstruction matrix, wherein the matrix elements are transmitted as side information in the bit stream;
- and
- an audio decoder processor configured to receive the matrix elements from the receiver and based on the matrix elements generate the reconstruction matrix, the audio decoder processor further configured to receive the reconstruction matrix from the reconstruction matrix generator and reconstruct the N audio signals from the M downmix signals using the reconstruction matrix,
- wherein approximations of the N audio signals are obtained as linear combinations of the M downmix signals with the matrix elements of the reconstruction matrix as coefficients in the linear combinations,
- wherein M is less than N, and M is equal or greater than one.
Dependencies are inferred from the claim text.