Postfilter for layered codecs
First Claim
1. Decoder device for signals representing audio or speech, comprising:
- one or more processors;
an input for receiving parameters of coded signals;
a primary decoder connected to said input, arranged, when executed by one of the processors, to provide a primary decoded signal based on said parameters;
a primary postfilter connected to an output of said primary decoder and arranged, when executed by one of the processors, to provide a primary postfiltered signal;
a secondary decoder connected to said input in addition to said primary decoder, said secondary decoder being arranged, when executed by one of the processors, to provide a secondary decoded signal based on said parameters, said secondary decoded signal being different from said primary decoded signal;
a combiner arrangement, arranged, when executed by one of the processors, for combining said primary postfiltered signal and a signal based on said secondary decoded signal into an output signal;
said output signal being a weighted combination of said primary postfiltered signal and said signal based on said secondary decoded signal; and
an output for said output signal, connected to said combiner arrangement.
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Accused Products
Abstract
A scalable decoder device (50) for signals representing audio comprises a primary decoder (21) connected to an input (40). The primary decoder (21) is arranged to provide a primary decoded signal (23) based on received parameters (4). A primary postfilter (31) is connected to the primary decoder (23) to provide a primary postfiltered signal (32). A secondary enhancement decoder (45) is connected to the input (40) and arranged to provide a secondary decoded enhancement signal (44). The device further comprises a combiner arrangement (55), arranged for combining the primary postfiltered signal (32) and a signal (53) based on the secondary decoded enhancement signal (44) into an output signal (6) to be provided at an output (6). The combining is made with an adaptable strength relation between contributions from the two signals. A method for decoding coded signals representing audio operates in analogy with the scalable decoder device (50).
31 Citations
36 Claims
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1. Decoder device for signals representing audio or speech, comprising:
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one or more processors; an input for receiving parameters of coded signals; a primary decoder connected to said input, arranged, when executed by one of the processors, to provide a primary decoded signal based on said parameters; a primary postfilter connected to an output of said primary decoder and arranged, when executed by one of the processors, to provide a primary postfiltered signal; a secondary decoder connected to said input in addition to said primary decoder, said secondary decoder being arranged, when executed by one of the processors, to provide a secondary decoded signal based on said parameters, said secondary decoded signal being different from said primary decoded signal; a combiner arrangement, arranged, when executed by one of the processors, for combining said primary postfiltered signal and a signal based on said secondary decoded signal into an output signal; said output signal being a weighted combination of said primary postfiltered signal and said signal based on said secondary decoded signal; and an output for said output signal, connected to said combiner arrangement. - View Dependent Claims (2, 3, 4, 5, 6, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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7. The decoder device according to claim wherein said secondary decoder is a secondary reconstruction decoder, in turn comprising a secondary enhancement decoder, and being further connected to an output of said primary decoder;
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said secondary enhancement decoder being arranged, when executed by one of the processors, to provide a secondary decoded enhancement signal based on said parameters; and said secondary reconstruction decoder being arranged, when executed by one of the processors, to provide a secondary decoded reconstruction signal based on said secondary decoded enhancement signal and said primary decoded signal. - View Dependent Claims (8, 9)
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19. A method of decoding coded signals representing audio or speech, comprising:
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receiving, at an input parameters of a coded signal; decoding, using a primary decoder, said parameters into a primary decoded signal; postfiltering, using a primary postfilter, said primary decoded signal into a primary postfiltered signal; decoding, using a secondary decoder, said parameters into a secondary decoded signal, said secondary decoding being performed in addition to said primary decoding, said secondary decoded signal being different from said primary decoded signal; combining said primary postfiltered signal and a signal based on said secondary decoded signal into an output signal; said output signal being a weighted combination of said primary postfiltered signal and said signal based on said secondary decoded signal; and outputting said output signal. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification