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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