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# Inverse Filter

37 Threads found on edaboard.com: Inverse Filter

## Find analytic description of low pass filtered signal

Hello, suppose there is a bessel filter (2nd order low pass) which has the following transfer function: TF_{Bessel}(s) = \frac{a_1}{a_1+b_1s+s^2} . I apply an input voltage of the form: V_{in}(s) = \frac{V}{s} I would like to find an anlytic description of the bessel output. Calculating the inverse laplace transform

## Using LMS based adaptive filter, howto implement the inverse system estimation scheme

Hello all, I am having a bit of trouble trying to implement this system in the figure to first have a binary signal go through a channel (which i've done) I then don't know what to do to get the new signal back to binary and how to do the training and decision directed parts. I am struggling to write the code in matlab to implement this. I have t

## Difference between Linear Frequency Cepstral Coefficients and Mel-frequency cepstral

The cepstrum is defined as the inverse Fourier transform of the log-magnitude Fourier spectrum. The Mel scale is roughly linear with Hertz scale to 1kHz then with increasing spacing approx. 50% per octave above this, according to human hearing perception. The MFCC scaled filter banks then become wider at higher frequency vs equal spaced for li

## FIR filter design problem

i wanted to know how FIR LPF filter are derived To get a basic idea, you can try a classical design method, called "direct synthesis": - perform an inverse fourier transform of the intended frequency response. Assume a pure real-valued function for simplicity. - apply a window (e.g. Hanning, Hamming, Blackman) to achieve a smoot

## Common Centroid Layout of DAC

Synopsis use something like this The pattern has the centroid inverse weight (1,2) with guarding (3) and sidebands 4~9 The weighted average improves accuracy from 10 to 12 bits and reduced size improves speed into microwave DAC speeds. It is like decimating a 1 D filter into 2D

## Nulling filter for removing an pulse

You'll remove the "echo" in the transfer function by a filter with the inverse transfer function. The echo cancellation filter will be however an IIR filter.

## IR couple? What should I take in account choosing ones?

max distance with minimum power can be traded off with speed of data and modulation. IR wavelength does not matter much as long as receiver bandwidth includes transmitter and you have a daylight blocking filter. Path loss is inverse squared, so smallest beam angle in emitter is desirable Power per bit can be computed as VI*t from transmitt

## How to visualize Cyclic Prefix in OFDM system

The fast explanation is that the FFT is a cyclic convolution. For example, people sometimes try to filter data by taking an N-point FFT adjusting coefficients, and then doing the inverse FFT. This would be nice if it always worked. But even a simple problem, like modeling a sample delay, is impossible. The FFT takes in N samples, and outputs N

## how to design bandpass filter with inverse charactersitcis of low pass filter

hello.. i need basic idea about predisotortion...i m going to work with low pass filter at the input side and output side bandpass filter ..maily in my stsytem contains random intereger generator,qpsk modulato ,raise cosine filter then i waill apply awgn channel after that block i want to make response linear so i will add bandpass (...)

## Open source filtering program

If you know how to do FFT in excel, then you know how to do the inverse-just select the "inverse" button in the dialog box.

## Filter characteristics

Hello Friends. Please help. I try to learn another's code, that had been written in assembler for ADSP 21062 digital signal processor. In this program I have fliter coeffs. How I can do inverse conversion????? Is it realy to get filter characteristics (Amplitude-freq characteristic, Phase-freq characteristic) by the filter coeffs????????

## I/Q modulation/demodulation using software dsp

Spectrum lab is excellent! I can see there is a plugin to demodulate I/Q. I have not used it extensively but I hope you could connect directly the outputs of an image reject mixer to the stereo input of a PC soundcard to recover and filter the audio. I would like to ask you if there is any plugin for the inverse process, i.e to create an audio

## Help selecting TVS for a simple inverse polarity circuit.

Hi, i need to protect a circuit input from inverser polarity feed without any meaningful voltage drop. I was thinking on the basic parallel TVS diode with a fuse and filter capacitor so i will get an extra surge protection and filtering. At a normal operation the circuit will powered by a 12V supply with a peak current of 14A, but a (...)

## what is pseudo filter?

I wish to know about pseudo filter and pseudo inverse filter..

I wonder how you want to apply the pwm modulated voltage to the ADC input, it would require a rather slow filter to achieve this without considerable errors. I think, that a programmable resistive voltage divider is a more promising option. To reduce the offset of a BJT operated as analog switch, you can connect it in inverse mode, but the curre

## Designing FIR without MATLAB.

A classical design method is based on the inverse fourier transform of the frequency repsonse, multiplied with a window function. I think, it's called "direct" synthesis or something similar.

## Inverse IIR Filter - computing the inverse of a filter

Refer the attached text for example of IIR inverse filter (Ex 5.5: IIRinverse)

## inverse chebyshev passive filter LC

Hi, inverse chebyshev passive filter are also called type ii chebyshev filter. plz check following it may help you, Digital Chebyshev filter Design help Chebyshev Type II filter order - MATLAB

## Cordic algorithm troubles

So I'm doing some digital signal processing. I have a a current and a voltage signal that I am multiplying together and then filtering through a lowpass filter to get a signal that equals A*B*cos(phi)/2. At this point I want to find phi, so I need the inverse cosine function. Unfortunatly I'm having troubles trying to write a cordic (...)

## Integer N PLL - lock times

Lock time is inverse proportional to PLL filter bandwidth. You should 2 things simultaneously -Locking time -Bandwidth Also, you have to find a optimum way between trade-off

## inverted transfere function

Good Morning Forum, i am a beginner in signal processing, so keep it easy on me. I have an transfere function of a system and i want to build an preconditioning filter that ereases the linear system. So I have heard that I can use the invererted transfere function. code in matlab?= invH = (H)^(-1); % making the inverse invh = ifft(invH

## Gaussian filter problem

Hi i am trying to filter a data set in matrix format using gaussian filter.i take the fourier transform of the data and then multiply with gaussian filter and take the inverse fourier transform of that. Now here is the function i have written(matlab) for gaussian filter design but seems to be not (...)

## satellite attitude determination using kalman filter problem

nikhil_bhadani, I would use a Digital Signal Processor (DSP) and Implement the Kalman algorithm in software. Implementing it in hardware would be a daunting task. Most DSPs have single instructions for matrix manipulation such as multiply, inverse, transpose, etc. Regards, Kral

## Designing a filter with linear transition area

i need to design a filter (any iir fir) with linear transition area(pass band to stop band)..... and also a high pass filter with the same...... any ideas...books what not.... Another thing......If a filter removes or attenuate (low attenuation) unwanted components.....how can i put it back...or amplify IT there an (...)

## Fourier transform representation

Hi, I have an image whose fourier transform is plotted. Now, my project is more related to optics of the eye. So, I have to induce a "defocus" by implementing a bessel filter and then the usual process (transform of filter * transform of image and then taking inverse transform to get the defocussed image). By defocussed, i mean, the image (...)

## What's the use of RLS and MLS algorithms?

The RLS (recursive least squares) algorithm is another algorithm for determining the coefficients of an adaptive filter. In contrast to the LMS algorithm, the RLS algorithm uses information from all past input samples (and not only from the current tap-input samples) to estimate the (inverse of the) autocorrelation matrix of the input vector bot

I am currently designing a LC ladder filter. I have already derived the filter transfer function from matlab. It's 5th order inverse-chebyshev filter. However, I have no idea how to implement it with LC ladder filter. what's the cirucit topology? How much the L and C value? (By the way, I want to (...)

## hey...How to use S-function in matlab??

hey...How to use S-function in matlab?? -------------------------------------------------------------------------------- I need to know how to use S-function in matlab to design a spacific filter with (inverse matrix) as transfer function???

## How to use S-function in matlab??

I need to know how to use S-function in matlab to design a spacific filter with (inverse matrix) as transfer function??? Added after 2 hours 4 minutes: I need to know how to use S-function in matlab to design a spacific filter with (inverse matrix) as transfer function??? Please I ne

solve your circuit in the s-domain get the the transfer function in s-domain then take inverse laplace you 'll get the time domain

## Why my Matlab hilbert transform is so noisy?

ihave written a MATLAB code for a hilbert transformer : first a half band filter is generated by sampling from raised cosine function in frequency domain and taking inverse fourie transformer, the hilbert transform is computed by subtracting .5 from transfer function and modulating the signal by e^jnpi/2 in the time domain and added with half of

## spectrum of the residual signal

hey i want to know what do you mean by spectrum of the residual signal is flat in speech context . to eloborate if i have a speech signal and if i perform LPC analysis on it to get the inverse filer, and i fiter the speech signal through this filter i will get a a residual which is periodic(quasi) impulse train for voiced case and a noisy wave

## What are the inverse models and where are they used?

Can any one pleease explain me what are inverse models and where they are used

## Help ME: PSoc Inverse RIAA filter guidelines.

Hi there. I am new to DSP and PSoC (Hell, then why I am thinking of doing something!!) Well, my idea is simple. I have a good turntable with moving magnet pickup. It was connected to Antique Pioneer amp which gave up. Now I plan to hook it to my Sony RV990D DVD system. First, I though of building a traditional Moving magnet preamp with RIA

## Who can tell me what is A-weight filter?

Weighting filters are used in audio S/N measurements. Basic shape of filter is inverse to human ear sensitivity characteristic. One of these shapes is A weighting filter (exists allso B, CCIF etc). Idea is to give more weight to frequency components at which ear is more sensitive. On web you can find a lot data about audio (...)

## how sound or noise are measured in decible?

1. Attached pdf will explain all about dB 2. Take in account that for acoustic measurements you must to use weight filter (A- curve, for example) that have frequency response inverse to human ear 2. Log calculation may be too heavy for small processor, so better to use hardware conversion - log amplifier (from Analog or TI)