Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [fir]

Anything related to Finite Impulse Response (FIR) digital filters, i.e. digital filters whose impulse response has strictly finite duration.

Anything related to Finite Impulse Response (FIR) digital filters, i.e. digital filters whose impulse response has strictly finite duration.

See also Wikipedia on FIR filters.

42 questions
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Code example for FIR/IIR filters in VHDL?

I'm trying to get started with DSP in my Spartan-3 board. I made a AC97 board with a chip from an old motherboard, and so far I got it to do ADC, multiply the samples for a number <1 (decrease volume) and then DAC. Now I'd like to do some basic DSP…
hjf
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Why does radar processing always require FIR filters?

Digital signal processing in radar applications is usually done using finite impulse response filters. Why is that the case? Wouldn't the use of an infinite impulse response filtering be much faster and feasible since we are talking about processing…
Ang Zhi Ping
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Does somebody know about a tool to design filters for DSPIC?

I have to make a filter with DSPIC33 and I want a program that design the filter (there are a lot), yet export code to DSPIC (in c, any compiler or assembly).
Tomas
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5
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FIR Lattice Filters

In DSP, sometimes the so-called Lattice Filters are use, having a structure like on this picture: I wonder what the advantages of the Lattice structure are, compared to other FIR filter types and what the applications of Lattice filters are.
T. Pluess
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3
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1 answer

Understanding digital filters, specifically their effects on time domain information, how to preserve the waveform of a signal being filtered?

According to Steven W. Smith, in his book: The Scientist and Engineer's Guide to Digital Signal Processing, when designing a digital filter, "Good performance in the time domain results in poor performance in the frequency domain, and vice versa",…
Albukhari
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Verilog FIR filter using FPGA

I am implementing an FIR filter in Verilog, using the DE2 board. For some reason the output out of the speakers is full of static, although it does appear to filter out some frequencies. Here is the code for the FIR: // Local wires. wire read_ready,…
algoBaller
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Is a IIR digital filter with a0=1 effectively a FIR digital filter?

I have been experimenting with several digital filters for my thesis recently, and while learning about the FIR and IIR kind, they seem to have similar output expressions. While using a Java class I found online to design a Butterworth IIR Filter's…
ravemir
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Strategy for approximating an FIR Filter with analog RLC components from Impulse Response

I have a measured digital/discrete finite impulse response from a system. As known from signal theory, this is in essence the sequence of filter coefficients of the corresponding FIR filter. I think in practice it should be possible to approximate…
Sky V
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FIR Filter on Cortex M0

Is it possible to implement basic DSP (such as an FIR Filter) on a Cortex M0 or is the architecture too limited?
beur_x
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Basic FIR Filter Question

We've just started learn about FIR filters in my DSP class. The homework question is: A particular FIR filter has coefficients {b(k)} = {3, 4, -4, -3} for k = 0, 1, 2, 3. Give the output y[n] when the input is x[n] = δ[n]. Am I correct that the…
whimsey
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How to scale output of FIR filter implemented in VHDL

For a DSP school project we need to implement sound effects in a SPARTAN 6 FPGA using VHDL. We tried to keep it simple and start off with a simple (100Tab) FIR filter. As coefficients we used those created by the MATLAB FDATool. The MATLAB output…
Devenda
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Array Sum Not Synthesizing

I'm writing a FIR filter in Verilog, but the circuit does not synthesize. I've tried many different things, but ultimately it doesn't seem to want to synthesize the sum of an array. I have tried splitting up the sum into 8 or 16 or 32 different…
user2704336
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Is it possible to compute delay with an IIR filter between peaks?

I am developing a project which receives accelerometer signals as input, which must then be analysed via peak-detection algorithms (among other techniques). In order to do so more effectively, I first filter the signal with a low-pass Butterworth…
ravemir
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DSP Fır filter speed

I've just started looking into DSP's. I have a few questions. We will apply Fir filter to the signal entering TMS320C6743. I want this filter to happen very fast. What does the speed of calculating the Fir filter depend on in the Dsp? Is it dsp…
Burak Guveli
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How can I prevent my IR sensor from sensing the sunlight?

I want to use an IR sensor for object detection. An LED will be turned on if an object is detected. But because of sunlight, it's malfunctioning (i.e. always getting logic 1). So, how do I omit the interference due to sunlight?
glibin dsilva
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