Cascading filters with different sampling frequencies.

Started by Anonymous in comp.dsp16 years ago 14 replies

Hello, I have two filters, one designed for a sampling frequency of 16kHz and the other for a sampling frequency of 8kHz. The type and kind...

Hello, I have two filters, one designed for a sampling frequency of 16kHz and the other for a sampling frequency of 8kHz. The type and kind of filters (FIR/IIR, HP/LP/Notch) is irrelevant. I need to plot the overall transfer function of this cascaded pair. What changes do I have to make (in the 8kHz filter, I am assuming), if any at all, in order to cascade the two filters? Pointers to ...


filter problem

Started by elbib00 in comp.dsp16 years ago 4 replies

hi, if i have a transfer function for my filter in frequency domain, how m able to convert this transfer function to filter coefficients...

hi, if i have a transfer function for my filter in frequency domain, how m able to convert this transfer function to filter coefficients in matlab(m-file)? any help will be greatly appreciated. regards This message was sent using the Comp.DSP web interface on www.DSPRelated.com


Upsampling revisited.

Started by Anonymous in comp.dsp16 years ago 3 replies

Hello, I have some basic ideas related to upsampling to bounce off this group. I have a filter's transfer function, say H(z). I want to...

Hello, I have some basic ideas related to upsampling to bounce off this group. I have a filter's transfer function, say H(z). I want to know what H(z^2) means. I know that I had asked a similar question on a thread some weeks back, but I am revisiting the issue and would like to get inputs specifically on this question. Now I did a little research on my own and found that the samplin...


Zeros in right half plane

Started by kmietas in comp.dsp16 years ago 4 replies

Hi, Is there any method of designing a controller for such transfer function: P(s) = 0.47 * (s-0.005) / (s^2 + 0.4s + 0.42) ? I'd be very...

Hi, Is there any method of designing a controller for such transfer function: P(s) = 0.47 * (s-0.005) / (s^2 + 0.4s + 0.42) ? I'd be very grateful for any advice. I just don't know how to handle with RHP zeros. Best regards, Marcin This message was sent using the Comp.DSP web interface on www.DSPRelated.com


Nonlinear system

Started by aries44 in comp.dsp16 years ago 4 replies

In case of linear time invariant systems we can use convolution to represent the system or to find the system response. However if we have...

In case of linear time invariant systems we can use convolution to represent the system or to find the system response. However if we have a nonlinear system how can we find the system response or the transfer function of the system? any ideas? This message was sent using the Comp.DSP web interface on www.DSPRelated.com


A difficult deconvolution...

Started by tramoman in comp.dsp16 years ago 4 replies

Hello, I am trying to model the behaviour of a reactor vessel when some particles inside the container strike the inner wall using...

Hello, I am trying to model the behaviour of a reactor vessel when some particles inside the container strike the inner wall using FINITE ELEMENT MODELLING software. I reproduced several random particles hitting the wall at different times and position across the surface of the inside wall. Now I would like to get rid of the TRANSFER FUNCTION of the container from the random particles...


A difficult deconvolution...

Started by tramoman in comp.dsp16 years ago 5 replies

Hello, I am trying to model the behaviour of a reactor vessel when some particles inside the container strike the inner wall using...

Hello, I am trying to model the behaviour of a reactor vessel when some particles inside the container strike the inner wall using FINITE ELEMENT MODELLING software. I reproduced several random particles hitting the wall at different times and position across the surface of the inside wall. Now I would like to get rid of the TRANSFER FUNCTION of the container from the random particles...


1st order all pass filter implementation

Started by Huo Jiaquan in comp.dsp16 years ago 1 reply

Dear all, I am reading a piece of C code supposedly implementing a 1st order all pass filter of transfer function A(z) = (C+z^-1)/(1+C*z^-1)...

Dear all, I am reading a piece of C code supposedly implementing a 1st order all pass filter of transfer function A(z) = (C+z^-1)/(1+C*z^-1) with the output decimated by a factor of 2, where C* denotes the conjugate of C*. From the code I guess C is real, so we ignore the conjugate at the moment. The piece of code is as follows: temp0 = sub(shr(in[4*i+0], 2), mult(COEFF5_1, data0)); ...


Quantization of fixed point filter coefficients.

Started by Anonymous in comp.dsp16 years ago 1 reply

This post is a retake on the 'quantization of filter coefficients' issue. Let me present the issue in the following. I have designed a...

This post is a retake on the 'quantization of filter coefficients' issue. Let me present the issue in the following. I have designed a filter (notch, cut-off 55.7Hz) which is a bi-quad. The transfer function is : H(z) = 1 + (-1.992)*z^-1 + (0.994)*z^-2 -------------------------------- 1 - (-1.836)*z^-1 - (0.852)*z^-2 Now I am implementing this filter on a 16-bit fix...


deconvolution to obtain impulse response

Started by NU in comp.dsp16 years ago 2 replies

Hi All, I am working with injecting contrast/dye and measuring the resulting enhancement (resulting from the injection) in a patient. The...

Hi All, I am working with injecting contrast/dye and measuring the resulting enhancement (resulting from the injection) in a patient. The injection is a square input (e.g., 20 ml @ 4 ml/sec for 5 sec). Now, I measure the resulting enhancement (OUTPUT) at a certain location. Now, this output is related to injection via the transfer function of the patient. so, OUTPUT = TRANSFER FUNCT...


Parallel realization of high-order filters?

Started by dialectics in comp.dsp16 years ago 2 replies

Hi all, My (non-commercial) project requires a parallel implementation of a high order filter with poles close to the unit circle. I've...

Hi all, My (non-commercial) project requires a parallel implementation of a high order filter with poles close to the unit circle. I've discovered that I can have the filter set up as either zpk or second-order-sections, but if i ever try and expand the polynomial (e.g. with poly) or have the filter design return a rational polynomial transfer function, i get a bad error. For example,...


patent status for HRTFs

Started by Anonymous in comp.dsp16 years ago 7 replies

I'm a patent novice, wishing I could stay that way, and have been trying to determine to what the patent status is for using...

I'm a patent novice, wishing I could stay that way, and have been trying to determine to what the patent status is for using head-related transfer functions/impulse responses to synthesize binaural signals. It seems that Higashi's 1995 patent (#5,386,082) is the oldest enforceable patent related to using HRIRs to synthesize binaural signals. More recently, Moller et al.'s 2000 patent (#6,...


Frequency response from impulse response in Matlab 7.0 simulink

Started by mkugan80 in comp.dsp16 years ago 10 replies

Hi, I would like know how can I get frequency response from impulse response of a transfer function, let say 1/s+1 in Matlab 7.0 simulink....

Hi, I would like know how can I get frequency response from impulse response of a transfer function, let say 1/s+1 in Matlab 7.0 simulink. I would want to have a bode plot.What blocks am I suppose to use and what are the configuration? Thanking you in advance..


What's important about noise in high frequency domain?

Started by lucy in comp.dsp16 years ago 4 replies

Hi all, I read on a book stating that "if the amplitude characteristic of the transfer function of a system is antenuating at high frequency,...

Hi all, I read on a book stating that "if the amplitude characteristic of the transfer function of a system is antenuating at high frequency, then it is good for combating noise at high freqency" which seems to me is that the more antennuation at high frequency, the better in terms of noise performance... What does this mean? ( I have never designed a system so I have never thought ab...


z plane design

Started by student in comp.dsp16 years ago 3 replies

i'm designing a simple filter and cannot expand my transfer function properly to remove the j part (z-cos@-jsin@)(z-j) the last one i made...

i'm designing a simple filter and cannot expand my transfer function properly to remove the j part (z-cos@-jsin@)(z-j) the last one i made was (z-cos@-jsin@)(z-cos@+jsin@) which i was able to expand using trigometric identities to get z^2 -2zcos@ + 1 i've been reading Strouds futher engineering mathematics all day but cant find a solution this is prob something really simple i'...


Have i done this right? OFDM spectrum

Started by Ant_Magma in comp.dsp16 years ago

Guys, i've finished my basic ofdm model and i'm currently working on the synchronization & later the modelling of the power line...

Guys, i've finished my basic ofdm model and i'm currently working on the synchronization & later the modelling of the power line transfer function... But i just wanna check out with you guys first whether my spectrum is correct or not... This is my model (50kb), the AWGN SNR is set at 30... http://geocities.com/antonio_magma/model.jpg And this is my output Tx spectrum, averaged about ...


inverse laplace transform

Started by Bhaskar Thiagarajan in comp.dsp16 years ago 8 replies

Hi all I'm working on trying to model a non-linear system (described by a second order differential eqn) into a discrete IIR filter. I guess...

Hi all I'm working on trying to model a non-linear system (described by a second order differential eqn) into a discrete IIR filter. I guess I'm trying to follow the impulse invariance IIR filter design method. In the laplace domain, the transfer function looks like this H(s) = a^2/(s+a)^2 I tried looking up laplace transform tables to find the time domain form for this and the closes...


Need Help: Multirate Systems

Started by Sumit in comp.dsp16 years ago

hi folks, I need sum help regarding multirate systems. I am currently working on a project where we r developing a Transfer Function model...

hi folks, I need sum help regarding multirate systems. I am currently working on a project where we r developing a Transfer Function model for Kalman Filter (Actually EKF). We have developed a Kalman Filter for Avionics System of an autopilot. In this filter we have GPS (measurements for KF) running at 5Hz and inputs that is accelerometers and rate gyoros (INS) at 25 Hz. KF operates at fr...


PSD of Integral of White Noise

Started by wiza...@yahoo.com in comp.dsp12 years ago 26 replies

Question: I recall learning that if a linear time-invariant system is driven by a WSS stochastic process, the PSD of the output equals the PSD...

Question: I recall learning that if a linear time-invariant system is driven by a WSS stochastic process, the PSD of the output equals the PSD of the input multiplied by the square of the magnitude of the transfer function. So, if I have white noise with some PSD=C, and I pass this through an integrator, can I compute the PSD of the output by dividing C by w^2, to yield PSD OUT = C/w^2? ...


Convolution Question

Started by HelpmaBoab in comp.dsp16 years ago 4 replies

I have a transfer function of a channel which is given by abs ( cos((pi/2) . (f/fc) ) where fc is a constant freq and the freq f goes from...

I have a transfer function of a channel which is given by abs ( cos((pi/2) . (f/fc) ) where fc is a constant freq and the freq f goes from dc to 2fc. What would be the best way of simulating this ie passing a known signal through this channel.? I suppose I coudldtake an inverse FT to get the impusle response but it has an absolute value in it. Maybe I could multiply in the freq domain a...