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 âas-isâ 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! 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