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...

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...

Hi, 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

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...

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://...

I was using the ADSP21161 which had the following signature for fir : float *fir ( const float dm input[], float dm output[], const...

I was using the ADSP21161 which had the following signature for fir : float *fir ( const float dm input[], float dm output[], const float pm coeffs[], float dm state[], int samples, int taps ); I was forced to switch to the ADSP21065L which has the following signature for fir : float fir ( float sample, const float pm coeffs[], float dm state[], int taps ); ...

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...

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...

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]...

Hello everyone... I am using a Narrow Digital FIR Bandpass filter to filter a signal at the output of an 8 bit ADC...I calculate the envelope...

Hello everyone... I am using a Narrow Digital FIR Bandpass filter to filter a signal at the output of an 8 bit ADC...I calculate the envelope at FIR ouput(I^2 + Q^2) using the complex outputs of the FIR bandpass filter..I want to express the FIR output envelope signal in terms of the power of the input signal...how to do it? What factors do i have to consider? My ADC full scale swing is 870 mV....

Hello all, I am trying to compute the inverse of an FIR filter: I tried to implement it with following steps: - take the FFT of the FIR...

Hello all, I am trying to compute the inverse of an FIR filter: I tried to implement it with following steps: - take the FFT of the FIR (h[n] -> H[Z] ) - compute complex 1/H[Z] (in the frequency domain) - invert back into the time domain. (IFFT) I was able to get the inverse FIR filter with above steps when the FIR filter is minimum-phase system. However, when I tried to implement w

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

Dear all, I have some doubts in the design of FIR filter...pls clarify 1.Can i set the clock frequency of the FIR filter at any frequency...

Dear all, I have some doubts in the design of FIR filter...pls clarify 1.Can i set the clock frequency of the FIR filter at any frequency i want but pretty much higher than the sample rate? for example :Fc=3.5khz Fs=8khz can i clock as any value > 8khz say 1Mhz(considering the max clock for target device) 2.For 256 taps ..Which is the best FIR filter de

Hi all, I have a set of samples for which I want to apply FIR filtering (assuming that filtering will be good). I know that...

Hi all, I have a set of samples for which I want to apply FIR filtering (assuming that filtering will be good). I know that digital filtering will give near precise filtering but I have little knowledge in FIR/IIR and I do not know where to apply which filter(yes, I googled ) . I need a small code segment that will do FIR filtering for my samples . I am using an 8051 microcontroll...

Hello, I am filtering a test signal (Tsig) with a FIR and then calculating the RMS error against a reference signal (Ref). The FIR adds a...

Hello, I am filtering a test signal (Tsig) with a FIR and then calculating the RMS error against a reference signal (Ref). The FIR adds a group delay to my test signal which needs to be compensated before I can calculate the error. For an FIR, I believe that delay compensation should be N/2, where N is the number of taps, or filter order. After looking carefully at the waveforms I se...

Hai, Is there any formula or general rule to set output width of FIR filter given its input ,coefficients width and number of taps.?? I red...

Hai, Is there any formula or general rule to set output width of FIR filter given its input ,coefficients width and number of taps.?? I red in some data sheet of FIR filter deisgn as: output width = input width+coefficient width+logN(base 2) In some other data sheet of FIR filter deisgn as: output width = 2*input width+logN(base 2) which of the above is correct??pls give some link ...

Hai all, Which FIR filter design method is used to design a non-symmetric LP FIR filter as the following method will give linear...

Hai all, Which FIR filter design method is used to design a non-symmetric LP FIR filter as the following method will give linear phase i.e.,symmetric coefficients 1.window 2.frequency sampling 3.equiripple Which is the best method to design a non-symmetric LP FIR filter? regards, faz

Greetings, 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 ...

Dear all, I would like to ask is there any way to have analytical estimation value of delay of minimum phase FIR filter based on the following...

Dear all, I would like to ask is there any way to have analytical estimation value of delay of minimum phase FIR filter based on the following assumptions: 1. we regard the position of largest magnitude coefficient as the delay, so for linear symmetric FIR filter the delay = (N+1)/2, where N is number of coefficient. 2. If we use same measure for minimum-phase FIR delay, how can we estimate...

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...

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 ...

I came across this online : "2.1.4 What is the delay of a linear-phase FIR? The formula is simple: given a FIR filter which has N taps, the...

I came across this online : "2.1.4 What is the delay of a linear-phase FIR? The formula is simple: given a FIR filter which has N taps, the delay is: (N - 1) / (2 * Fs), where Fs is the sampling frequency. So, for example, a 21 tap linear-phase FIR filter operating at a 1 kHz rate has delay: (21 - 1) / (2 * 1 kHz)=10 milliseconds." I think the formula should be (N-1)/(Fs). For example assum...

> > On 02/07/2011 10:02 PM, rashmi venugopal wrote: > > > is fir filter is benificial or the iir filter for the application to > > > measure...

> > On 02/07/2011 10:02 PM, rashmi venugopal wrote: > > > is fir filter is benificial or the iir filter for the application to > > > measure the total harmonic distortion in metering equipment. > > > and also reasons to select particular filter, > > > > > > fir requires more memory than iir,, but iir is not a linear phase,, > > > > Does linear phase matter if you just want to know power magnitude? FIR

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...

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.