Patent ID: 6208671
Filing Date: 2001-03-27
Classification: H03H

Abstract:
An asynchronous sample rate converter for converting a first sample rate Fs1 of a signal A to a second sample rate Fs2 comprising:an interpolation filter receiving as input the signal A having the first sample rate Fs1, the interpolation filter upsampling the sample rate to a sample rate UFs1, where the upsampling factor U is directly related to a ratio of Fs2/Fs1, the interpolation filter removing images during upsampling, the interpolation filter providing as output a signal B(n) having the upsampled sample rate UFs1;a resampler receiving as input the signal B(n) from the interpolation filter, the resampler resampling the signal B(n) to have a sample rate DFs2, where D is a downsampling factor, the resampler performing linear interpolation on the resampled signal, the resampler providing as output the linearly interpolated signal C(n) having the sample rate DFs2 wherein the resampler comprises a linear interpolator circuit that performs linear interpolation on the signal B(n) so that magnitude attenuation zeros are placed in a frequency spectrum of the signal B(n) at integer multiples of the sample rate DFs2; anda decimation filter receiving as input the linearly interpolated signal having the sample rate DFs2, the decimation filter downsampling the linearly interpolated signal C(n) having the sample rate DFs2 to a signal Z having the second sample rate Fs2.