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US 8,255,212 B2Granted
Filter compressor and method for manufacturing compressed subband filter impulse responses
AssigneeDolby International AB
InventorLars Villemoes
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AssigneeDolby International AB
InventorLars Villemoes
Estimating the term…
A filter compressor for generating compressed subband filter impulse responses from input subband filter impulse responses corresponding to subbands, which include filter impulse response values at filter taps, includes a processor for examining the filter impulse response values from at least two input subband filter input responses to find filter impulse response values having higher values and at least one filter impulse response value having a value being lower than the higher values, and a filter impulse response constructor for constructing the compressed subband filter impulse responses using the filter impulse response values having the higher values, wherein the compressed subband filter impulse responses do not include filter impulse response values corresponding to filter taps of the at least one filter impulse response value having the lower value or include zero-valued values corresponding to filter taps of the at least one filter impulse response value having the lower value.
A filter compressor for generating compressed subband filter impulse responses from input subband filter impulse responses corresponding to subbands, which comprise filter impulse response values at filter taps, comprising:
A method for manufacturing compressed subband filter impulse responses from input subband filter impulse responses corresponding to the subbands, which comprise filter impulse response values at filter taps, comprising:
A non-transitory storage medium having stored thereon a computer program for performing, when running on a processor, a method for manufacturing compressed subband filter impulse responses from input subband filter impulse responses corresponding to the subbands, which comprise filter impulse response values at filter taps, comprising:
A non-transitory computer-readable storage medium comprising stored thereon a plurality of sets of subband filter impulse responses, each set of subband filter impulse responses together approximating a time-domain head related transfer function-related filter, wherein a filter impulse response of each of the time-domain head related transfer function-related filters is larger than the sum of the lengths of the subband filter impulse responses of the respective set of subband filter impulse responses, or wherein a filter impulse response of each of the time-domain head related transfer function-related filters is larger than the sum of the lengths of the complex-valued filter impulse response values of the subband filter impulse responses of the respective set of subband filter impulse responses, when the filter impulse response values are complex-valued.
Dependencies are inferred from the claim text.