Small tutorial on CIC lters J. Arzi E-mail : contact AT tsdconseil.fr December 1, 2015 Foreword CIC lters are much used in applications where one needs to change the sampling frequency in a big ratio, for instance for decimation (reduction of the sampling rate: oversampled acquisition systems, ADC ) or interpolation (DAC). Unlike IIR filters, it is always possible to implement a FIR filter using coefficients with magnitude of less than 1.0. Basically a decimator is a digital low pass filter, which also include the operation of sample rate reduction. Fixes and Tutorials for the Decimation Mod. By continuing to use this site, you are agreeing to our use of cookies. A CIC filter consists of an equal number of stages of ideal integrator filters and comb filters. The lowpass filter consists of two polyphase filters - one for the decimator and one for the interpolator. The DFSDM information about CIC filters, refer to Eugene B. Hogenauer, “An economical class of digital filters for decimation and interpolation,” IEEE Transactions on Acoustics, Speech and Signal Processing, pp. This guide is useful especially for newcomers to 3D modelling in general. A Decimation Filter is one of the most used filters in signal processing and noise avoiding sustems. The efficiency gain of this mode l … The basic functionality of the DFSD M is to implement a di gital filter. decimation filter that together produce a high-resolution data-stream output. In this recipe, you will learn about point density, densification and decimation. Welcome to the 3DF Zephyr tutorial series. Part 1 will explore the basic topology and funcion of the t DS modulator, and Part 2 will explore the basic topology and function of the digital/decimation filter module. 155-162, April 1981. (The overall gain of the FIR filter can be adjusted at its output, if desired.) • Decimation includes digital low pass (anti-aliasing) filter followed by a decimator – The operation is equivalent to utilizing an analog anti-aliasing filter at fc = FS /2M and sampling a converter at Fd= FS /M, where M = decimation count (i.e. Half band filters are useful digital filters that have symmetric impulse responses and generally about half their impulse response consists of 0 (zero) thus allowing for fewer multiplications. Digital and Decimation Filter The output of the sigma-delta modulator is a 1-bit data stream at the sampling rate, which can be in the megahertz range. 1.1 Decimation and Interpolation 1.2 Digital Filter Banks Digital Filter Banks A digital lter bank is a collection of digital lters, with a common input or a common output. 1.3 Digital filter The DFSDM peripheral (digital filter for sigma- delta modulators) processes the digital part of the A/D conversion. DS converters: An overview This is an important consideration when using fixed-point DSPs, because it makes the implementation much simpler. Each polyphase filter runs at th e reduced sample rate of F s / M where M is the decimation (i nterpolation) factor and F s is the sampling rate of the orig-inal filter. Decimation ﬁltering is commonly accomplished using FIR (ﬁnite impulse response), rather than IIR, ﬁlters. The digital data stream is provided by an external sigma-delta modulator. 2) • Decimation is used to: 1.Decrease the ADC data rate to reasonable levels for data capture The purpose of the digital-and-decimation filter (Figure 9) is to extract information from this data stream and reduce the data rate to a more useful value. FIR ﬁlters have a linear phase response, which can be of considerable importance in some applications. This two-part article will look closely at the DS ADC’s core. 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