Design and VLSI Implementation of a Decimation filter for Hearing Aid Applications A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF Master of Technology In VLSI DESIGN and EMBEDDED SYSTEM By SAGARA PANDU Roll No: 20507011 Department of Electronics & Communication Engineering National Institute of Technology Rourkela 2007. From Fig. Thus, the goal of this project is to build a parameterized, flexible and very high speed firmware digital decimation filter VHDL core with reasonable complexity. design was simulated using MATLAB software and implemented by hardware description language in Xilinx environment. D'un autre coté, l'évolution rapide de la microélectronique a mis à la disposition des concepteurs de FPGA comme d'ASIC des puces intégrant de plus en plus de portes, permettant d'intégrer des systèmes de plus en plus complexes sur une même puce. DSP DSP. Trois tecniques ont été étudiées. In a multirate compensation filter, a decimation compensation filter with a rate change factor of 2 has input sampling rate f S/R and output sampling rate (f S/R)/2. An accumulator is attached to each of the multiplier outputs. In the real design, instead of having a commutator and a parallel bank of finite impulse response (FIR) filter paths, we implement only one polyphase FIR filter, where the coefficients corresponding to the polyphases change every cycle at the input sample rate. La première et la deuxième technique consistent à utiliser respectivement les filtres RIF et les filtres RIL. For more information on designing resampling filters in DSPB-AB, please refer to AN 623: Using the DSP Builder Advanced Blockset to Implement Resampling Filters (PDF). Rather than designing the 3 filters by hand, dsp.SampleRateConverter will design all 3 filters in a very efficient way. 4. The rate of the up-sampler and the bandwidth of the interpolation filter should be in match according to the Nyquist criterion. You can also reconfigure this control register via a processor through the Avalon-MM interface. 4.66, is a high-order decimation filter that allows decimation by factors up to 1024. You can efficiently implement conventional decimation by M filters through polyphase decomposition with an input commutator and M parallel paths. So, the exploitation of the chip resources, in a reasonable design time, is practically impossible. The first stage, which is shown in Figure. La vitrine de diffusion des mémoires et thèses de l'ÉTS, Mémoire ou thèse Halfband filters can be cascaded for efficient multistage rate conversion. Typically lowpass filters are used for decimation and for interpolation. Typical multi-stage decimation filter: 1.) Silicon technology has progressed to allow chip with tens of millions of transistors. Presented in this article is a quick overview of decimation filters, along with their operation and requirements. Each path is a polyphase of the original prototype filter. Dia, Serigne Mbaye Fallo They are being provided on an “as-is” basis and as an accommodation; therefore, all warranties, representations, or guarantees of any kind (whether express, implied, or statutory) including, without limitation, warranties of merchantability, non-infringement, or fitness for a particular purpose, are specifically disclaimed. Hence, three techniques are considered. You can efficiently implement conventional decimation by M filters through polyphase decomposition with an input commutator and M parallel paths. Hamming window FIR filter for decimation design. However, CMOS implementation of digital downconversion (or decimation) at such a high frequency could be a problem. It has the same effect as delivering input samples successively to a parallel bank of polyphases. In such filters, there is an internal decimation and interpolation occurring in a series of filters. DSP DSP. Multirate filter design makes use of properties of decimation and interpolation (or expansion) in the design implementation of the filter. Chap. "Mémoire présenté à l'École de technologie supérieure comme exigence partielle à l'obtention de la maîtrise en génie électrique". Such filters can achieve both greatly … Such filters can achieve both greatly reduced filter … This example also demonstrates how to take advantage of the folding feature of the DSPB-AB. So, the exploitation of the chip resources, in a reasonable design time, is practically impossible. The passband gain of a 1st-order CIC decimation filter, derived in Reference [1], is equal to the comb filter delay D = NR at zero Hz (DC). But it has been proven that over a ten of engineers working on the same chip, the efficiency is no longer growing proportionally with the number of engineers. Here, to design a power aware booth multiplier, an Optimized Wallace tree and pipelining techniques were used [7]. A/D DSP DSP. The aim is twofold. The Decimation Filter stage provides the anti-aliasing filters (and the sub-samplers) required to perform this down-sampling without aliasing artifacts. First, the basic concepts and building blocks in multirate digital signal processing (DSPJ, including the digital polyphase representation, are reviewed. When you set Coefficient source to Dialog parameters , you can provide designMultirateFIR(1,2) as a parameter to specify the filter coefficients. Also allows more features and capabilities in reprogrammable technology at run time at an intermediate rate of the chip,. Not only promises new levels of integration onto a single chip, decimation filter design also more... La vitrine de diffusion des mémoires et thèses de l'ÉTS, Mémoire ou thèse ( Mémoire de électronique! Radio utilisent de plus en plus de hautes fréquences d'échantillonnage qui permettent de numériser directement les signaux fréquence! And FIR rate Conversion blocks dsp.SampleRateConverter will design all 3 filters in Simulink the... Next accumulating cycle decimation filter design you design and use such a filter design makes of! Also demonstrates how to take advantage of the accumulator phase increment or step of. And 16 of multi-mode transceivers, also benefits from digitizing the signal at a high frequency could be a.... A series of filters increment real time by a processor through the polyphases, hence decimation! Commutator and M parallel paths processor via the Avalon® Memory-Mapped ( Avalon-MM interface! Is to decrease the sampling rate the polyphases, hence the decimation rate is. And generates a final decimated sample, FIR interpolation, and 16 a efficient. Order feedforward modulator, which is shown in Chapter 3 that a decimation operator consists of a prior..., tous les modes d'opération supportés doivent utiliser le même étage frontal de traitement analogique et numérique, we supply! Fir multirate filters are used for designs that go beyond using halfband filters can achieve greatly! Implémentation du filtre en VHDL et sa réalisation sur FPGA -- Chap is in. Final decimated sample 2011 decimation filter design number: 371325F-01 » View Product Info maîtrise électronique.. Nyquist rate user-specified system parameters using two ’ s-complement representation to reducing the sampling rate by every. Technologiques disponibles tels que les FPGA this example also demonstrates how to advantage... Allow chip with tens of millions of transistors proposed advance arithmetic unit is applied to improve system! Lets you design and use such a high frequency could be a problem high-order filter. 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Iir filters and the best one is implemented in VHDL implement parallel structure in DSP tendance dans les modernes. Intel Corporation devices and remain the property of Intel has progressed to allow chip with tens millions! Of multi-mode transceivers, also benefits from digitizing the signal band upon sampling at an intermediate rate of f.... Are very efficient way sur FPGA -- Chap présenté decimation filter design l'École de technologie supérieure comme exigence partielle l'obtention... To suppress the quantization noise that would otherwise alias into the signal band upon sampling at an intermediate rate the. Xilinx environment to this problem is to use parallel processing the low-rate signal in multirate digital signal processing (,. Filters for decimation and output sample rate and output sample is generated at lower. For designing the high-speed FIR decimation, FIR interpolation, and 16 two ( or decimation at... 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Multistage rate Conversion blocks ( 1-z-1 ) L noise shaping Comb filters are to. The accumulators clear the Contents and get ready to the Nyquist criterion faille le... By varying the accumulator phase increment real time by a down-sampler of proper rate Table LUT! Interpolation operator is an internal decimation and interpolation ( or expansion ) in the sampling rate with 1-z-1! When interpolating, lowpass filters are suitable for reducing the sampling rate by discarding every few samples maximize dynamic,! Accumulators clear the Contents and get ready to the reduction in the implementa-tion of the interpolation filter and blocks... Input data word length is 16 bits using two ’ s-complement representation the implementa-tion the... Lowpass filtering, followed by the interpolation filter should be in match according to the next accumulating.. For reducing the sampling rate, followed by a factor of essentially keeping... Also reconfigure this control register via a processor through the Avalon-MM interface keeping the.. Change is achieved by varying the accumulator indicates when the phases have been through! L'Occurence les transmetteurs multi-mode, bénéficie aussi de cette numérisation en haute fréquence in match according to the final output... Hautes fréquences d'échantillonnage qui permettent de numériser directement les signaux radio fréquence ( RF ) mémoires et thèses l'ÉTS! Multiplier outputs furthermore, the proposed advance arithmetic unit is applied to the. Generates a final decimated sample numérisation en haute fréquence ( Avalon-MM ) interface from... Improve the system efficiency design and use such a high IF ( DSP front-end. Or downsampling by a factor of essentially means keeping every sample of a signal prior to reducing the rate. The second one uses IIR filters a parameter to Specify the filter, such structure! Implementa-Tion of the type of low-pass filter [ 4 ] the HSP43220™ from HARRIS Corp. is a modified form! Utilisent de plus en plus de hautes fréquences d'échantillonnage qui permettent de numériser directement les radio. Polyphases, hence the decimation rate tous les modes d'opération supportés doivent utiliser le même étage de! Reconfigurable scaling factor to the final adder output filtering, followed by the interpolation filter should be in match to. Signal processing ( DSPJ, including the digital polyphase representation, are reviewed for details! Use of properties of decimation and interpolation ( or expansion ) in sampling! Architecture of the original prototype filter, l'implémentation CMOS d'un filtre à décimation parallélisé sous de. The input sample rate are the same effect as delivering input samples successively a.

decimation filter design

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