Method and device for encoding and / or decoding spatial background noise in multi-channel input signals

Abstract

The present invention provides a method for encoding a multi-channel input signal containing N different channels, an encoding apparatus, and a non-temporary computer-readable medium. [Solution] The method 600 includes the steps of: 601 determining whether the current frame in a sequence of frames is an active or inactive frame using a signal and / or voice activity detector; 602 determining a downmix signal containing N or fewer channels based on a multichannel input signal; 603 determining upmix metadata, which is determined depending on whether the frame is active or inactive, and which includes a parameter set for generating a reconstructed multichannel signal containing N channels based on the downmix signal; and 604 encoding the upmix metadata into a bitstream.

Claims

1. A method for encoding a multichannel input signal containing N distinct channels, wherein N is a positive integer greater than 1, the input signal contains a sequence of frames, and the method provides for the current frame of the sequence of frames. The steps include determining whether the current frame is an active frame or an inactive frame using a signal and / or voice activity detector, The steps include determining a downmix signal containing N or fewer channels based on the multi-channel input signal, A step of determining upmix metadata, which includes a set of parameters for generating a reconstructed multichannel signal containing N channels, based on the downmix signal, wherein the upmix metadata is determined depending on whether the current frame is an active frame or an inactive frame. The steps include encoding the upmix metadata into a bitstream, A step of determining the covariance, in particular the covariance matrix, for the current frame of the multichannel input signal in multiple different frequency bands, wherein the number of frequency bands depends on whether the current frame is an active frame or an inactive frame. The steps include determining one or more parameters of the upmix metadata based on the covariance with respect to the current frame, including, method.

2. An encoding device configured to perform the method described in claim 1.

3. A non-temporary computer-readable medium that stores instructions for causing one or more processors to perform the operation of claim 1 when executed by one or more processors.

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