## Forums Search for: fir

## Cascading FIR

inHello I have two DSP connected in serial mode. Have FIR with 2000 coefficients . Need to recalc and divide coefficients of FIR by 1000 for 2...

Hello I have two DSP connected in serial mode. Have FIR with 2000 coefficients . Need to recalc and divide coefficients of FIR by 1000 for 2 DSP, so that in serial application give result of FIR with 2000 points. Delay of FIR here dont work, bcs FIR of each DSP is 1000 points maximum. Is this possible? WBR, Vasilius. --------------------------------------- Posted through http://...

## REMEZ FIR filter generation (FIR Design Algorithms)

inHello, i am looking for an algorithme in C in order to generate Parks-McClellan FIR filter. I found one...

Hello, i am looking for an algorithme in C in order to generate Parks-McClellan FIR filter. I found one at "http://www.menne-biomed.de/". I want to know if someone has already use this type of algorithme ? Is there another available ? Is generated FIR coeficients are good ? thanks for your help

## My own FIR coefficients for 21061 won't work

Hi again. There is "bandpass filter demo" in demonstration programs for 21061 EZ-Kit Lite. It works something like that: -- cut here...

Hi again. There is "bandpass filter demo" in demonstration programs for 21061 EZ-Kit Lite. It works something like that: -- cut here -- . . . #define NUM_TAPS 256 // uses fir.h file filled with 256 coefficients float pm coeffs[NUM_TAPS] = { #include "fir.h" }; float dm state[NUM_TAPS+1]; . . . // and spooky fir() function, from filters.h: tx_buf[1] = fir( rx_buf[1]...

## Looking for FIR in C for 21061 EZ-Kit

inHi there, Is this true, that's impossible to create properly working FIR using VisualDSP 3.0 for 21061 EZ-Kit ? I tried to run simple FIR...

Hi there, Is this true, that's impossible to create properly working FIR using VisualDSP 3.0 for 21061 EZ-Kit ? I tried to run simple FIR (using different codes, samplerates and coefficients), and only what I got is noise :( Is there anybody, who have a working FIR filter project written in C for 21061 EZ-Lite ? Thanks, Jarek

## software radio

inHi folks, I am looking for literature that describes either the TX or RX (or both) chains for a software radio with the following (ideal)...

Hi folks, I am looking for literature that describes either the TX or RX (or both) chains for a software radio with the following (ideal) constraint: the radio uses digital FIR filters (post ADC/pre DAC) that operate between 100MHz and 300MHz (maybe a singlerate FIR or an FIR that interpolates into this range or a decimation FIR that downsamples from this range). Failing that, any li...

## FIR filtering with differential design

inGreetings, I have to use a digital FIR filter on a transmitter side having root raised cosine characteristic. I understand we need to have...

Greetings, I have to use a digital FIR filter on a transmitter side having root raised cosine characteristic. I understand we need to have one FIR on I channel and one FIR on Q channel. What is it going to be if I have differential I and Q, meaning I+, I- and Q+, Q-. Do we need to implement one filter on each single ended signal, meaning a total of 4 filters? Let me know if you ...

## De Emphasis FIR Filter

inHi all, do you know if there is a way to make a de-emphasis filter a FIR filter. I already have a FIR filter implemented and I would like to...

Hi all, do you know if there is a way to make a de-emphasis filter a FIR filter. I already have a FIR filter implemented and I would like to just load it with coefficients of de-emphasis FIR. Can approximation of IIR filter be done with FIR filter? If I had an impulse and let it throught IIR filter and took the output, could that output be a FIR filter coefficients? Thank you in adv...

## replacing 8th order bessel with FIR

inwe use a filter chip we can't get any more, at least not reliably. it's an 8th order bessel. I want to replace it with an RC and then do...

we use a filter chip we can't get any more, at least not reliably. it's an 8th order bessel. I want to replace it with an RC and then do tight filtering in FIR in the uC, a 32 bit integer processor. I understand FIR is specified differently than analogue filters. Q: is there a rule of thumb to come up with an FIR that's "as good as" an 8th order bessel? Thanks, Jon.

## FIR Filter limitation (or not?)

inHello, I am quite new to the field of digital FIR filters (I always worked with the old-fashionned analog ones, but I digress). There is an...

Hello, I am quite new to the field of digital FIR filters (I always worked with the old-fashionned analog ones, but I digress). There is an important aspect to FIR filters that eludes me: A low pass digital FIR filter filters out all frequencies in the stopband (to the set attenuation). This is quite obvious. Now what remains unclear to me is that if the digital filter can only recover ...

## Design of FIR filter with Sharp Transition and High Stop Band Attenuation

inHi I have to design a FIR filter with very steep transition at cutoff and high stop ban attenuation. FIR bcoz I need linear phase. I have...

Hi I have to design a FIR filter with very steep transition at cutoff and high stop ban attenuation. FIR bcoz I need linear phase. I have matlab available. Fdatool is useless since its FIR dont have a good transition. In literature search I came by papers talking about Sharp transition FIR`s using Frequency response masking and multirate filters. I wanted to know if someone has any experien...

## FIR Filter Help

inHi, I would like to apply a FIR filter to my frequency sample array. Specifically, I want to use a band-pass filter against my data, but...

Hi, I would like to apply a FIR filter to my frequency sample array. Specifically, I want to use a band-pass filter against my data, but I'm pretty new to DSP and I'm not sure exactly how to integrate this. First, I have a complex array of frequency data (real, imaginary). Second, I've used a FIR design program to come up with the following information: -Rectangular window FIR filter ...

## FIR filter using only a hand calculator

inIs it possible to perform an FIR filter on 8 bit digital data using only the simplest tools? Like an 8bit MCU with very limited RAM? How can I...

Is it possible to perform an FIR filter on 8 bit digital data using only the simplest tools? Like an 8bit MCU with very limited RAM? How can I generate very low level code from an FIR filter so I can translate it into assembler for the MCU I am using? I am thinking of using the Atmel ATTINY13. An FIR filter is just a sequency of steps, albiet lots of steps, and even more steps if you cant ...

## Re: How to design FIR filter with matematical equation?

On May 23, 8:11 am, "c1910" wrote: > hi, > i'm very new with DSP FIR. > i need to make a Bandpass filter with FIR design. first, i use...

On May 23, 8:11 am, "c1910" wrote: > hi, > i'm very new with DSP FIR. > i need to make a Bandpass filter with FIR design. first, i use the AM > signal for the input, then i want to get the information signal by > filtering the AM signal. > The problem is to get the value of transfer function of the FIR filter, i > need a mathematical equation, > i don't know where to

## Re: How to design FIR filter with matematical equation?

On May 23, 8:11 am, "c1910" wrote: > hi, > i'm very new with DSP FIR. > i need to make a Bandpass filter with FIR design. first, i use...

On May 23, 8:11 am, "c1910" wrote: > hi, > i'm very new with DSP FIR. > i need to make a Bandpass filter with FIR design. first, i use the AM > signal for the input, then i want to get the information signal by > filtering the AM signal. > The problem is to get the value of transfer function of the FIR filter, i > need a mathematical equation, > i don't know where to

## Shifting FIR frequency centre

inYou design a linear FIR(symmetrical real coefficients) then you decide to move its frequency centre. The new FIR (complex) may not maintain...

You design a linear FIR(symmetrical real coefficients) then you decide to move its frequency centre. The new FIR (complex) may not maintain symmetry of its real part or imaginary part or both. Its groupdelay may show "spikes" around that of original FIR. Does that mean we lost linearity by shifting? Any response appreciated. Kadhiem

## IIR vs. FIR (complexity issues)

inHi, I would like to know on the implementation complexity issues beween FIR Filter vs. IIR Filter (Chebyshev). I know that IIR is more...

Hi, I would like to know on the implementation complexity issues beween FIR Filter vs. IIR Filter (Chebyshev). I know that IIR is more complex than FIR. But, in case of the FIR filter has higher order number than IIR, FIR can be more complex. If I have IIR Chebyshev 10th order vs. FIR with 59 Taps. Which one is the most complex one? Thanks, Berry

## Why not just make FIRs by hand?

inI'm looking to use the overlap-add FFT technique for doing FIR filtering and many of the examples I've seen use some more known FIR design...

I'm looking to use the overlap-add FFT technique for doing FIR filtering and many of the examples I've seen use some more known FIR design method such as the window method for designing the FIR that will be convolved with the input. However, To me it seems like in the overlap-add FFT technique it should be possible to define the FIR by hand by simply drawing the frequency response as values ...

## regarding Symmetric FIR

inHallo , In principle symmetric FIR can run at a speed half that of Normal FIR but it reqires 3 inputs at a time . I am...

Hallo , In principle symmetric FIR can run at a speed half that of Normal FIR but it reqires 3 inputs at a time . I am designing a Coprocessor , and my interface is such that i can only get 2 addresses at a time . What is the solution for me to get the 3rd address . Thanking you all in advance ....

## How to design FIR filter with matematical equation?

inhi, i'm very new with DSP FIR. i need to make a Bandpass filter with FIR design. first, i use the AM signal for the input, then i want to get...

hi, i'm very new with DSP FIR. i need to make a Bandpass filter with FIR design. first, i use the AM signal for the input, then i want to get the information signal by filtering the AM signal. The problem is to get the value of transfer function of the FIR filter, i need a mathematical equation, i don't know where to start and what equation or theory to use?! can you give me an equation to ...

## how to apply 2D FIR filter to an image using MATLAB?

inHi all, I have used remez function to design a 1D FIR filter and converted it to a 2D FIR filter using ftrans2. However, wat commands in matlab...

Hi all, I have used remez function to design a 1D FIR filter and converted it to a 2D FIR filter using ftrans2. However, wat commands in matlab can i use to apply this 2D FIR filter to my image? thks..