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 there, I?m going to start my thesis work on Inertial navigation system for mobile Robot(Gyro-inclinometer),so i need to use filter...

Hi there, I?m going to start my thesis work on Inertial navigation system for mobile Robot(Gyro-inclinometer),so i need to use filter algorithm.I?ve some idea about kalman filter,but i would like to know which filter is most suitable to my project.What are the alternative adaptive filter techniques for Kalman filter?Could anyone please suggest me the filter techinque(or where can i find r...

I want to make bandpass filter from lowpass filter prototype. first i made lowpass filter and frequency translated using cosine function and...

I want to make bandpass filter from lowpass filter prototype. first i made lowpass filter and frequency translated using cosine function and i saw the freq. response of translated coefficient. but it differs from lowpass filter response. b = firceqrip(368, 4.3/(122.88/2), [0.1, 0.0018], 'slope', 0); fvtool(b); n=0:length(b)-1; cos_b = b.*(cos(((3*pi)/8)*n)); fvtool(cos_b) > lowp

I want to make bandpass filter from lowpass filter prototype. first i made lowpass filter and frequency translated using cosine function and...

I want to make bandpass filter from lowpass filter prototype. first i made lowpass filter and frequency translated using cosine function and i saw the freq. response of translated coefficient. but it differs from lowpass filter response. b = firceqrip(368, 4.3/(122.88/2), [0.1, 0.0018], 'slope', 0); fvtool(b); n=0:length(b)-1; cos_b = b.*(cos(((3*pi)/8)*n)); fvtool(cos_b) > lowp

Hi, Can anyone give introduction about POTSBAND Design filter? and what the purpose of this filter??? I found matlab code for this...

Hi, Can anyone give introduction about POTSBAND Design filter? and what the purpose of this filter??? I found matlab code for this filter, function [b,a]=bandfilter(fs, f1, f2) %POTSBAND Design filter for 300-3400 telephone bandwidth [B,A]=(FS) %Input: FS=sample frequency in Hz %Output: B/A is a discrete time bandpass filter with a passband gain of 1 %The filter meets the specifications o...

In GFSK we use a Gaussian filter to shape the baseband transmit data to reduce the occupied signal bandwidth. As we all know and love;...

In GFSK we use a Gaussian filter to shape the baseband transmit data to reduce the occupied signal bandwidth. As we all know and love; this introduces ISI. As I understand it the receiver matched filter is the reversed transmit filter, which in this case is again a Gaussian filter. However this matched filter doesn't "undo" the ISI, correct? If the Gaussian filter is the only thing tha...

Hello everybody, I have a microphone with a given internal frequency filter IF(x) that I found experimentally in lab. I have around 10 points...

Hello everybody, I have a microphone with a given internal frequency filter IF(x) that I found experimentally in lab. I have around 10 points defining this filter from 100 hz to 16 Khz. (I can improve the granularity if required) I want to apply a A weighting filter AF(x) on the source ofthe microphone. but the output will be wrong if I apply directly the A filter from the output of t...

Hi, I am trying to find a way to implement a FIR filter which can give allpass filter with quadratic phase response. The transfer function...

Hi, I am trying to find a way to implement a FIR filter which can give allpass filter with quadratic phase response. The transfer function I am trying to implement is : H = exp( j * alpha * w^2 ). Can some one suggest what is best filter design approach that can be used to find the filter cofficients. Most of the filter design methods concentrate on the amplitude response and linear ...

Hi, I have a question regarding filter coefficients for a Parks-McClellan filter. I'm trying to write a simple software loop for the filter...

Hi, I have a question regarding filter coefficients for a Parks-McClellan filter. I'm trying to write a simple software loop for the filter using its difference equation, but I've noticed a difference between the number of taps. For, say, a ten tap FIR filter designed using a Hamming window, there will be eleven filter coefficients C0, C1,...C10 which mulitply by the filter inputs x(n)...

Hi all, Its known that the delay for a FIR filter is (N-1)/2 where N is the length of the filter and the filter is symmetric. I am supposed...

Hi all, Its known that the delay for a FIR filter is (N-1)/2 where N is the length of the filter and the filter is symmetric. I am supposed to calculate the Mean Square Error between the input and output of the filter. Since the length of the output will be greater than the length of the input, I wanted to know how to relate the output of the filter to the input of the filter. i.e., if x(n...

Dear all, My task is to implement a very narrow high pass filter to remove a DC offset of a signal. So the cut off frequency of the filter is...

Dear all, My task is to implement a very narrow high pass filter to remove a DC offset of a signal. So the cut off frequency of the filter is very low. The filter must be linear phase. A first implementation was made using a double cascaded moving average filter. The filter seems to do its job very well. Unfortunately the group delay of the filter is too large. I have read some articles o...

Hi all: A paper gives a filter: [ -2 3 -6 3 -2 3 4 2 4 3 -6 2 48 2 -6 3 4 ...

Hi all: A paper gives a filter: [ -2 3 -6 3 -2 3 4 2 4 3 -6 2 48 2 -6 3 4 2 4 3 -2 3 -6 3 -2 ]/64 and uses its orthogonal filter to solve a problem, but the author did not give out what is its orthogonal filter exactly. I wonder is this filter a famous one and the orthogonal filter is notorious...

Hello, I'm now designing a IIR interpolation filter. The interpolation filter consists of a IIR lowpass filter stage and a Sinc filter...

Hello, I'm now designing a IIR interpolation filter. The interpolation filter consists of a IIR lowpass filter stage and a Sinc filter stage. I dont know how to compensate for the passband droop of the Sinc filter. Can you help me? Daniel This message was sent using the Comp.DSP web interface on www.DSPRelated.com

Hello, I've got after the FM demodulation (by derivative : (IdQ-QdI) / (I=B2+Q=B2)) a low pass filter. This filter is a IIR Butterwoth 4th...

Hello, I've got after the FM demodulation (by derivative : (IdQ-QdI) / (I=B2+Q=B2)) a low pass filter. This filter is a IIR Butterwoth 4th order. But I know that I can use a box car filter. But what is a box car filter ? Is it a FIR filter with rectangular window ? Or FIR filter with all the coefficients to value one ? I think that I just need to make an integration of my FM demo...

Hello... I created a polyphase filter filter based on F.Harris's book shared register design. This is a Decimation by 2, 100 tap, Fs...

Hello... I created a polyphase filter filter based on F.Harris's book shared register design. This is a Decimation by 2, 100 tap, Fs =100MHz, Low pass 20MHz - stop band 24MHz filter. Each MAC is 28-bit length, 14-bit ADC input, and the filter output is truncated. I also created a Xilinx distributed arith filter to compare using the same filter coefficients. ( For some reason I could no...

I was following the previous posts on Matched Filters. Very interesting. Some questions keep haunting me. These may be stupid. I dont...

I was following the previous posts on Matched Filters. Very interesting. Some questions keep haunting me. These may be stupid. I dont know. 1. If the Transmitter Filter (i.e., Pulse Shaping Filter) G_T(t) is symmetric, then the matched filter G_R(t) is same as the pulse shaping filter. Hence for Raised Cosine (RC) pulse shaping filter, the matched filter is also RC. For RRC pulse shaping, ...

Hi, When one designs a fractional rate change filter, when specifying the filter parameters do you design the filter at the interpolated rate...

Hi, When one designs a fractional rate change filter, when specifying the filter parameters do you design the filter at the interpolated rate or the decimated rate? For example if you have an input rate of Fs then interp by 64 decimate by 125 filter and the filter will be implemented in a P/Q polyphase fashion do you design the filter at the 64*Fs rate? Assuming that the signal is alr...

I am trying to figure out why all treatments of MLSE receiver for ISI channels use the idea of a matched-filter followed by a noise...

I am trying to figure out why all treatments of MLSE receiver for ISI channels use the idea of a matched-filter followed by a noise whitening filter? Isn't the latter a simple inverse of the former? In fact if we simply don't go into the matched-filter/whitening-filter duo, we can still derive what Proakis refers to as the "Equivalent Discrete-time White Noise Filter Model" for an ISI channel (a...

Hi, I have to implement an IIR filter. The filter is designed in MATLAB, fdatool. My problem would be, that I generate a C header file from...

Hi, I have to implement an IIR filter. The filter is designed in MATLAB, fdatool. My problem would be, that I generate a C header file from the filter I designed, but I don't know how to implement it. The filter is an order of 4. I know that we usually take the filter to parts of the order of 2, two ensure stability. My general problem would be, that in theory we devide the numerator, with the...

I need to implement a particular filter that has 240 taps and it works/designed for a sampling rate of 125kHz. I want to change the sampling...

I need to implement a particular filter that has 240 taps and it works/designed for a sampling rate of 125kHz. I want to change the sampling rate of the filter from 125kS/s to 250kS/s to match the the hardware I am using, which operates at 250kS/s if i run the filter as is (at 250kS/s), the spectrum of the filter is stretched by 2. Is there an easy way to modify the filter taps to change ...