Non-causal postfilter
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorStefan Bruhn
Life of this patent
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Abstract
A decoder arrangement comprising a receiver input for parameters of frame-based coded signals and a decoder arranged to provide frames of decoded audio signals based on the parameters. The receiver input and/or the decoder is arranged to establish a time difference between the occasion when parameters of a first frame is available at the receiver input and the occasion when a decoded audio signal of the first frame is available at an output of the decoder, which time difference corresponds to at least one frame. A postfilter is connected to the output of the decoder and to the receiver input. The postfilter is arranged to provide a filtering of the frames of decoded audio signals into an output signal in response to parameters of a respective subsequent frame.
Claims20
A decoder arrangement, comprising:
- a receiver input for parameters of frame-based coded signals;
- a decoder connected to said receiver input, arranged to provide frames of decoded audio signals based on said parameters;
- a postfilter connected to an output of said decoder and arranged to provide an output signal based on said frames of decoded audio signals;
- wherein at least one of said receiver input and said decoder is arranged to establish a time difference between the occasion when parameters of a first frame (x(n)) is available at said receiver input and the occasion when a decoded audio signal of said first frame (y(n)) is available at said output of said decoder, which time difference corresponds to at least one frame;
- the postfilter further arranged to receive said first frame of the decoded audio signals (y(n)) essentially simultaneously as the parameter of a respective subsequent frame (x(n+1));
- wherein said postfilter is connected to said receiver input;
- and,
- wherein said postfilter is arranged to provide a filtering of said first frame of the decoded audio signals (y(n)) into an output signal (yout(n)) using said parameter of the respective subsequent frame (x(n+1)).
A decoding method, comprising the steps of:
- receiving parameters of frame-based coded signals;
- decoding said parameters into frames of decoded audio signals;
- wherein at least one of said step of receiving and said step of decoding causes a time difference between the occasion when parameters of a first frame (x(n)) is available after reception and the occasion when a decoded audio signal of the first frame (y(n)) is available after decoding, which time difference corresponds to at least one frame;
- receiving, at a postfilter, said first frame of the decoded audio signals (y(n)) essentially simultaneously as the parameter of a respective subsequent frame (x(n+1));
- postfiltering said first frame of the decoded audio signals (y(n)) into an output signal (yout(n)) using said parameter of the respective subsequent frame (x(n+1));
- and,
- outputting said output signal.
Dependencies are inferred from the claim text.