Patent ID: 7724162
Filing Date: 2010-05-25
Classification: H03H

Abstract:
1. Circuit for converting the sample rate of a digital signal, the circuit comprising an integer factor sample rate conversion circuit, wherein the benefits of a symmetrical or asymmetrical impulse response on the one hand and those of a polyphase realization on the other hand are combined, the circuit further comprising an input for applying said digital signal, a conversion filter having either a symmetrical or anti-symmetrical impulse response and a polyphase realization, the conversion filter implemented as a plurality of subfilters in parallel, each subfilter having a symmetrical or anti-symmetrical response derived from a combination of the conversion filter polyphase components, the combination including multiplying the digital signal only with factors of 1 and −1, combining means for combining said applied digital signal input signals of said plurality of subfilters or for combining output signals of said plurality of subfilters into a digital signal with converted sample rate, after multiplying the applied digital signal input signals of said plurality of subfilters or after multiplying the output signals of said plurality of subfilters, with factors 1 or ½, an output for outputting said digital signal with converted sample rate.