Fir filter apparatus, audio apparatus and fir filter program
US8145693B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 22, 2009 |
| Grant date | Mar 27, 2012 |
| Priority date | — |
| Expiry date | Sep 21, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0223
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A coefficient compensating unit 33 calculates based on a loop point and a cross-fade point of impulse response coefficient data renewed compensation impulse response coefficients specified for a cross-fade period defined between the cross-fade point and an end point of the impulse response coefficient data, and stores the calculated impulse response coefficients in a compensation coefficient memory 34, wherein the cross-fade point corresponds to a beginning point of the cross-fade period in which a cross-fading is performed to smoothly connect the end point with the loop point. A product-sum operation unit 36 reads audio signal data from an audio signal buffer 35 and reads from the compensation coefficient memory 34 impulse response data including the compensated impulse response coefficients specified for the cross-fade period, and multiplies the audio signal data by appropriate impulse response coefficients to obtain multiplication data and accumulates the multiplication data, outputting the accumulated data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.