Started by in Matlab DSP12 years ago

Hi How do we add noise at bandpass? my system parameters are Fc=12KHz, Fs=48KHz, B=4KHz and rate 1/2 convolution code. So how do we...

Hi How do we add noise at bandpass? my system parameters are Fc=12KHz, Fs=48KHz, B=4KHz and rate 1/2 convolution code. So how do we generate bandpass noise and scale with appropriate factor? Your help will be greatly appreciated. Thanks Chintan

## bandpass sampling

Started by in Matlab DSP19 years ago

hi, i need to plot the bandpass signal sampling waveforms. (something like fig 2.9 ,pg 37 in understanding digital signal...

hi, i need to plot the bandpass signal sampling waveforms. (something like fig 2.9 ,pg 37 in understanding digital signal processing by richard g.lyons) i dunno how to do it.. can anyone help me...

## how to transform from analog Bandpass filter ----->equivalent Lowpass filter

Started by in Matlab DSP14 years ago

Transformation from analog Lowpass filter to Bandpass filter is obtained by following steps 1 - desing low pass filter having specifications of...

Transformation from analog Lowpass filter to Bandpass filter is obtained by following steps 1 - desing low pass filter having specifications of bandpass filter 2 - obtain transfer function of lowpass filter 3 - subsitute s' = [(s^2+wo^2)/s] into Lowpass Tansfer fn to obtain banspass Transfer fn. but how can we transform a BP filter to Lowpass filter in analog domain..... if anyone ha...

## need help bandpass filter in simulink

Started by in Matlab DSP17 years ago

Hi,I have a couple of questions see if anyone can help: There are about the simpowersystems of simulink. 1. I couldn't find the...

Hi,I have a couple of questions see if anyone can help: There are about the simpowersystems of simulink. 1. I couldn't find the block reference for "discrete 2nd-order variable-tuned fliter(BANDPASS FILTER)". in this block, there are two input-ports, F and in? what

## Problem in Bandpass filter, passband reappear after half sampling frequency

Started by in Matlab DSP18 years ago 3 replies

Hi all, I am beginner in digital filter design. Currently, I am designing a bandpass filter cut-off at 500hz and 1.8khz, with...

Hi all, I am beginner in digital filter design. Currently, I am designing a bandpass filter cut-off at 500hz and 1.8khz, with sampling frequency 6k Hz. I use butterworth filter with order 6 according to the specification. However, when I try to plot the signal, there is

## Sampling Bandpass signals

Started by in Matlab DSP20 years ago 2 replies

Hi everybody, I have some question about sampling bandpass signals. There is sampling theorem for this kind of signals, the...

Hi everybody, I have some question about sampling bandpass signals. There is sampling theorem for this kind of signals, the sampling rate must be two times the frecuency of the max information component instead of the max frecuency afther modulation. If you play with the

## BandPass FIR filter using Windowing

Started by in Matlab DSP11 years ago 2 replies

I am working on a school project, and I need to create a Linear phase, causal, digital Bandpass FIR filter using windowing methods. with the...

I am working on a school project, and I need to create a Linear phase, causal, digital Bandpass FIR filter using windowing methods. with the following specifications. Sampling fs= 24khz Passband freq= p1= 2*pi*4000, and p2= 2*pi*8000 rad/sec stopband freq= st1=2*pi*3000 st2=2*pi*9000 rad/sec Minimum stopband attenuation = 40db having the lowest possible filter length. I fou...

## Bandpass Filter

Started by in Matlab DSP13 years ago 1 reply

Hello Everybody, I want to design a bandpass filter using Matlab. Roughly I know how to use remez but in my case I have the following...

Hello Everybody, I want to design a bandpass filter using Matlab. Roughly I know how to use remez but in my case I have the following data: Center Frequency = 44.1e3; Band Width = 1837.5e3; Which means that I know the center frequency and both the cutoff frequencies but I don't have the passband frequencies. So how can I design the filter in matlab since the command needs 4 frequencie...

## Filter Design(Complex Bandpass Filter)

Started by in Matlab DSP13 years ago

Hello; I need some help regarding complex bandpass filter design. The task is to design a complex BPF with passband at 8-12MHz and stopbands at...

Hello; I need some help regarding complex bandpass filter design. The task is to design a complex BPF with passband at 8-12MHz and stopbands at -16-7MHz and 13-16MHz. The idea is to design with through complex modulation of proper lowpass prototype filter. I was wondering how to include the negative frequencies if i design it using firpm/remez function. The LPF has passband at -2 to 2MHz and stop...

## analog filter order for cheby1

Started by in Matlab DSP17 years ago 1 reply

Hi My target filter is a bandpass analog filter. With N=7, cheby1 returns a 14th B(s), A(s). But if the target is a LPF or HPF,...

Hi My target filter is a bandpass analog filter. With N=7, cheby1 returns a 14th B(s), A(s). But if the target is a LPF or HPF, the results are 7th order B(s),A(s). Could somebody explain why bandpass filter design using cheby1 doubles the order on B(s) and A(s)? Thanks

## Bandpass filter 2dFFT

Started by in Matlab DSP11 years ago

Hi there, I have a 2d data, with space x time (longitude and time). I need to do a bandpass filter while taking windows on both dimensions....

Hi there, I have a 2d data, with space x time (longitude and time). I need to do a bandpass filter while taking windows on both dimensions. Dimension 1 is space and dimension 2 is time. For space, my window should be between 5.4 to 7, and for time is 1.5 to 4. I started as: data=data(:,:); %1:180 x 1:225 [Ns,Nt]=size(data); Ts=1/4; % each unit of space is 0.25 of a degree Tt=10/...

## Bandpass filter

Started by in Matlab DSP11 years ago

Hi there, I have a 2d data, with space x time (longitude and time). I need to do a bandpass filter while taking windows on both dimensions....

Hi there, I have a 2d data, with space x time (longitude and time). I need to do a bandpass filter while taking windows on both dimensions. Dimension 1 is space and dimension 2 is time. For space, my window should be between 5.4 to 7, and for time is 1.5 to 4. I started as: data=data(:, :); %1:180 x 1:225 [Ns,Nt]=size( data); Ts=1/4; % each unit of space is 0.25 of a degree T...

## ELLIPTIC FILTERS - HELP REQUIRED

Started by in Matlab DSP17 years ago

Hello I am trying to construct an N-th order bandpass digital elliptic filter using the command: [B,A] = ELLIP(N,Rp,Rs,Wn)...

Hello I am trying to construct an N-th order bandpass digital elliptic filter using the command: [B,A] = ELLIP(N,Rp,Rs,Wn) where Wn is a two- element vector, Wn = [W1 W2] with 0.0 < Wn < 1.0, with 1.0 corresponding to the Nyquist frequency. The parameters Rp

## Frequency divider

Started by in Matlab DSP18 years ago 2 replies

Hi Guys, My question has something to do with frequency multiplier and divider in a PLL. For example, before a QPSK is fed into...

Hi Guys, My question has something to do with frequency multiplier and divider in a PLL. For example, before a QPSK is fed into a PLL, i have to pass the signal through a 4th power device and bandpass it. I could do this by muliplying 4 times. However, i am not sure how to

## filter constants

Started by in Matlab DSP13 years ago

In the following Matlab routine: == %*********************************************** % BandPass...

In the following Matlab routine: == %*********************************************** % BandPass Filter %*********************************************** Wn = [1.5, 9]/(Fs/2); [b,a] = ellip(6,0.1,40,Wn); data = filter(b,a,fr_in); %*********************************************** %******************************************* % Plot the rms of the compressed data %*********************...

## Help using butterworth filters

Started by in Matlab DSP15 years ago 1 reply

Hello, I'm currently taking an Electrical Engineering class but I'm a Mathematics Graduate student so I'm missing some of the screws that put...

Hello, I'm currently taking an Electrical Engineering class but I'm a Mathematics Graduate student so I'm missing some of the screws that put this whole shebang together so I'm having some trouble with some probably very basic things for all of you. Anyways, I'm trying to construct 7 butterworth bandpass filters but they're not coming out how I want them to. I'm used to using the fir1 filter

## FIlter Design

Started by in Matlab DSP17 years ago 1 reply

Hi I am implementing FIR Filtrs in Matalb. I have basic doubts in this. Actually i know the cutoff frequencies and the Q factor...

Hi I am implementing FIR Filtrs in Matalb. I have basic doubts in this. Actually i know the cutoff frequencies and the Q factor for my filter design. I want to implement Lowpass, Bandpass and Higpass Filters(FIR). Can you pl somebody help me out in giving the suggetions.

## Calculating Attenuation factor for Butterworth filter

Started by in Matlab DSP13 years ago

Hi, I was wondering if any one can help me or point to any references which can help me calculate the attenuation factor of a third...

Hi, I was wondering if any one can help me or point to any references which can help me calculate the attenuation factor of a third order Butterworth Bandpass filter. Thanks Kaanth.

## Simple butter filtering question!

Started by in Matlab DSP12 years ago 1 reply

Hello everyone, I was wondering if anyone could give me their insight to this problem. I am trying to understand how to use a bandpass filter...

Hello everyone, I was wondering if anyone could give me their insight to this problem. I am trying to understand how to use a bandpass filter in butter to pass only a certain band of frequency. This works for a simple cosine with one frequency, but with a summation of cosines.. dt=.001; %sampling rate Fs=1/dt; %sampling freq HalfFs=Fs/2; t=-10:dt:10; m=cos(2*pi*49*t)+cos(2*pi*50*t); ...

## frequency transformation for filter design

Started by in Matlab DSP11 years ago 1 reply

Hello, I am designing some bandpass filters, starting from a normalized low-pass Butterworth approximation. I have the nominator and the...

Hello, I am designing some bandpass filters, starting from a normalized low-pass Butterworth approximation. I have the nominator and the denominator of the transfer function. With: tf(nom,den); I get the transfer function. How can I change the variable s to variable s1=Q*(s/w+w/s)? On the other hand, how can I change the order of teh values in a vector? For example if I have ...