Let L/M denote the upsampling factor, where L > M. Upsample by a factor of L; Downsample by a factor of M; Upsampling requires a lowpass filter after increasing the data rate, and downsampling requires a lowpass filter before decimation. When the decimation factor is an irrational number, the filters intended for integer or fractional decimation can not be directly used. Polyphase filters are particularly well adapted for interpolation or decimation by an integer factor and for fractional rate conversions when the interpolation and the decimation factors are low. The decimation filter then returns an output signal y(n) with the new sampling frequency. > > Then I find many people talk about polyphase decimation filter, I wonder > if it is more efficient than what I'm doing? For an input sample arriving at time instant , the fractional interval is (8) For fractional decimation, the fractional interval for the lth in-put sample is (9) The impulse response in the generic model is now (10) 1. ( Dear Newbie, I have understood the theory concept of Fractional decimation rate converter. Hello everyone! H i(z): analysis lters x k[n]: subband signals F i(z): synthesis lters SIMO vs. MISO Typical frequency response for analysis lters: Can be marginally overlapping non-overlapping Description. The L:M Fractional Sample Rate Converter (F-SRC) architecture according to claim 10, wherein when the decimation factor of the low-pass and decimation filter is different from the up-sampling factor P of the up-sampler input block, a conversion rate is given by (LP)/(MPOUT), where POUT denotes the decimation factor of the low-pass and decimation filter in the case POUT≠P. 2, 4, or 8 Channels per JESD Lane; 10-Gbps JESD Interface; Supports lane rate up to 12.8 Gbps for short trace length (< 5 Inch) The digital decimation filter 16 is shown in more detail in the block diagram of FIG. The filter coefficients for this polyphase filter are suitable for a parabolic farrow combin er, and have been calculated based on a low-pass filter with cutoff at 0.25, and a passband at 0.75. Parabolic Filter The parabolic filter is a low-pass filter with a passband = 0.25 and a stopband = 0.75 . For such a multi-channel FIR, it is recommended [Ref 3] to use the hardware efficient systolic ... 3/4, 5/8, 5/6 are decimation ratios, 4/3, 8/5, 6/5 interpolation ratios. I have … Among them, linear interpolation filter has a simple implementation structure, only … decimation and interpolation). Upsampling and downsamping alter the size of the data set by an integer ratio of samples. o It is the antiimage filter that performs the interpolation, not the upsampler. In order to achieve a fractional sample rate, upsamplers and downsamplers need to be coupled together to change the data rate to a fraction of the input data rate. Firstly, the fractional power spectrum of the chirp-stationary signals which are nonstationary in the FD can be sensed effectively by the coprime DFrFT filter banks because of the linear time-invariant (LTI) property of the proposed system in discrete-time Fourier domain (DTFD), while the coprime DFT filter banks can only sense the power spectrum of the WSS signals. Combining the modified CIC filter idea and the programmable fractional CIC decimation idea we have obtained the efficient proposed decimator structure of Fig. The m inimum attenuation occurs at the edge o f the. samples the outputs of the polyphase filters sequentially at rate

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