The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 14, 1999
Filed:
Aug. 06, 1997
Tieying Duan, Maple, CA;
ATI Technologies, Thornhill, US;
Abstract
A 1:2 or 2:1 audio sampling rate conversion filter converts audio signals from a first sampled rate to a second sampled rate has a multi-coefficient subfilter for receiving a plurality of audio signal samples from buffer memory obtained by sampling at the first sampled rate, and for performing convolution on the plurality of audio signal samples to generate a multi-coefficient based convolution product. In combination with the multicoefficient subfilter, the audio sampling rate conversion filter has a single coefficient subfilter for only receiving a middle sample from the buffer memory and for performing convolution on the middle sample using a single middle coefficient to generate a single middle coefficient based convolution product. The multi-coefficient based convolution product and the single middle coefficient based convolution product are used to convert the audio signal samples obtained at the first sampled rate to audio signal samples corresponding to signal samples obtained as if sampled at the second sampled rate. A commutator in combination with the multicoefficient and single coefficient subfilters is used to achieve a reduction in the number of multiplications required by the filter to obtain suitable rate converted signal samples.