Kalman Filter

Started by Senthil_Avionics in comp.dsp11 years ago 3 replies

Dear Sir/Madam, Why the noise used in Kalman filter is assumed to be White noise? Any particular reason? Regards, Senthil Kumar...

Dear Sir/Madam, Why the noise used in Kalman filter is assumed to be White noise? Any particular reason? Regards, Senthil Kumar S, Assistant Professor, Hindustan University, Chennai.


Adding noise to ADC input to increase accuracy

Started by dwjbosman in comp.dsp11 years ago 2 replies

Dear all, I have just been reading about the use of oversampling in a decimator to enhance the resolution of a sampled signal. The idea is...

Dear all, I have just been reading about the use of oversampling in a decimator to enhance the resolution of a sampled signal. The idea is to sample a signal containing 0.5LSB white noise at samplerate of N times the Nyquist rate. It is then possible to extract log4(N) extra bits of resolution by summing N samples. However there is another scheme which can provide much more of an increase...


noise removal from audio signal using cepstral analysis

Started by enricophpdsp in comp.dsp11 years ago 6 replies

hello, i have an audio signal mixed with white noise. How do i use the cepstrum technique to remove the noise from it. please tell me from...

hello, i have an audio signal mixed with white noise. How do i use the cepstrum technique to remove the noise from it. please tell me from where should i start. i want to know the basics of cepstrum and how can i use it to fullfill my purpose. please guide me about the literature which i should read. thanks


Non-harmonic data in speech

Started by Raeldor in comp.dsp11 years ago 2 replies

Are there any good techniques to either remove or detect the amount of non-harmonic data (white noise?) in speech? I really want to remove or...

Are there any good techniques to either remove or detect the amount of non-harmonic data (white noise?) in speech? I really want to remove or detect the 's', 'z' etc. sounds in the sample. Is this possible? Thanks Rael


This is daft FIR power

Started by HardySpicer in comp.dsp11 years ago 22 replies

suppose a first order FIR filter H(z)=1+az^-1 has white noise of unit variance (zero mean) ) passed through it. Then the output power...

suppose a first order FIR filter H(z)=1+az^-1 has white noise of unit variance (zero mean) ) passed through it. Then the output power (variance) will be (1+a^2) X1 which is always greater than the input power?


Oversampling technique need help...

Started by glias in comp.dsp10 years ago 26 replies

Hello all, I have IR preamp with a gain of 64dB, the output noise is about 50mV peak to peak for a signal of 4V peak peak (max) and the bandwidth...

Hello all, I have IR preamp with a gain of 64dB, the output noise is about 50mV peak to peak for a signal of 4V peak peak (max) and the bandwidth is 350kHz. I have a AD7626 (16 bits 10MSPS ADC) which is largly suffisient for my aplpication. I would want to know what would be the best method to filter the noise (which is white noise and 1/f noise which come from the IR detector) in my band of i...


AR parameter estimation

Started by abraham007 in comp.dsp10 years ago 4 replies

Hi all i am working on reverberation rejection algorithm based on AR prewhitening. According to my understanding i can model a time-domain...

Hi all i am working on reverberation rejection algorithm based on AR prewhitening. According to my understanding i can model a time-domain signal (say A) using AR method and if i pass a unit variance white noise through the filter based on AR parameters, i should get a signal approximate to original signal(A). I have tried to implement same theory in MATLAB using ar, armcov etc for AR pa...


Band limited Gaussian White noise generation

Started by veccia in comp.dsp10 years ago 28 replies

I need to generate a Gaussian White Noise which has the frequency content of less than a constant frequency, cut-off frequency, for running...

I need to generate a Gaussian White Noise which has the frequency content of less than a constant frequency, cut-off frequency, for running a vibration exciter. I thought to generate this signal in frequency domain with the frequency content that I need and then transform it to time domain by means of ifft. The point is that I need to have control over the time domain content of my signal, more sp...


Unit pulse for White noise

Started by valtih1978 in comp.dsp10 years ago 16 replies

Do you know that there is one-to-one correspondence between frequency and time domain images of a function? Some people say that white noise...

Do you know that there is one-to-one correspondence between frequency and time domain images of a function? Some people say that white noise has white noise in frequency domain. However, we know that white noise has a frequency spectrum of constant "1". It is not a Guassian. The sum of all sines in freq domain is a Unit response! Why do they use all these complex random generators to pr...


Pulse in white noise

Started by HardySpicer in comp.dsp9 years ago 19 replies

What is the best filter for a pulse in white noise? I remember in the depths of the past reading something about a filter with a reverse- time...

What is the best filter for a pulse in white noise? I remember in the depths of the past reading something about a filter with a reverse- time impulse response of the pulse which you convolve it with, but this is just an integrator. Hardy


Transfer function of an acoustic response of an open cavity

Started by evawoo in comp.dsp9 years ago 1 reply

Hello guys, I'm having problems with understanding what I have read from an SAE international paper. There they did an measurement called :...

Hello guys, I'm having problems with understanding what I have read from an SAE international paper. There they did an measurement called : Acoustic response test of an open cavity, where they evaluate the acoustic response of a cavity with small orifice by a transfer function of the system. The measurement consists of two steps. In the first step, white noise is emmitted by a loudspeaker...


Kalman Filters and Pink Noise

Started by Tim Wescott in comp.dsp9 years ago 4 replies

Oddball question. Or maybe just a plea for comments. I'm kind of getting painted into a corner, and the color of the paint is pink. It's...

Oddball question. Or maybe just a plea for comments. I'm kind of getting painted into a corner, and the color of the paint is pink. It's looking like I need to estimate pink noise with a Kalman filter. Anyone done anything remotely like this? Know of anyone who has? Did they survive? The method that I know of for simulating pink noise involves running white noise through a fil...


Time domain representation of colored noise

Started by Prateek B S in comp.dsp9 years ago 9 replies

I understand that the time domain representation of white noise looks like impulses. How do colored noises like brown, pink etc. look like when we...

I understand that the time domain representation of white noise looks like impulses. How do colored noises like brown, pink etc. look like when we perform an inverse Fourier Transform on them ? What could be some sources of colored noise that may affect speech signals? I am currently working on a project that involved removing noise from speech signals. Any help would be greatly app


Impulse response to periodogram

Started by Anonymous in comp.dsp8 years ago 3 replies

Is this obvious - not sure. Of course I can pass white noise through the impulse response then calculate periodogram in the usual way from the...

Is this obvious - not sure. Of course I can pass white noise through the impulse response then calculate periodogram in the usual way from the time series. But is there a simpler way?


Optimal filter(s) to remove white noise

Started by Anonymous in comp.dsp8 years ago 12 replies

Hi everyone, I' have stumbled upon some interesting info while looking for Digital signal processing...

Hi everyone, I' have stumbled upon some interesting info while looking for Digital signal processing litterature. http://www.analog.com/static/imported-files/tutorials/MT-017.pdf "Many scientists and engineers feel guilty about using the moving average filter. Because it is so very simple, the moving average filter is often the first thing tried when faced with a problem. Even


Bispectrum

Started by Anonymous in comp.dsp8 years ago 2 replies

I am trying to understand Bispectrum by doing some simple examples. I have looked at most of the literature but few of them give any simple...

I am trying to understand Bispectrum by doing some simple examples. I have looked at most of the literature but few of them give any simple examples. Suppose I have an FIR filter (NMPhase). Then it's z-transfer function spectrum I can find easily suppose a(z^-1)=1+a1z^-1 and it is driven with zero-mean non-Guassian white noise unit variance. P(z^-1)=a(z^-1)a(z) It's Bispectrum - is it ...


OT. How to become a forensic audio expert

Started by Anonymous in comp.dsp8 years ago 8 replies

Step 1 Buy adobe audition Step 2 Mix white noise together with a beeping sound Step 3 Run the built- in noise removal...

Step 1 Buy adobe audition Step 2 Mix white noise together with a beeping sound Step 3 Run the built- in noise removal program Step 4. Appear multiple times on CNN to explain how, if the flight 370 beacon were still operating, they could pull it out if the noise. Or, if they ever find the black box, they could enhance the cockpit alerts. I want this job. Bob


Max absolute value of colored Gaussian noise

Started by Tim Wescott in comp.dsp7 years ago 33 replies

I need a number, and I'm feeling lazy; has anyone worked this out recently? I want to know the distribution of the maximum of the absolute...

I need a number, and I'm feeling lazy; has anyone worked this out recently? I want to know the distribution of the maximum of the absolute value of a vector of samples of a colored, zero-mean Gaussian process. Or, stated another way, I want to shove white noise into a filter, then examine a finite chunk of the filter output for it's maximum absolute value. Anyone know the answer? ...


Wrong results in periodogram code in Matlab

Started by wobbler28 in comp.dsp7 years ago 3 replies

Hi, I am learning about spectral analysis, now I want to solve a periodogram problem in Matlab but I'm getting wrong results, don't...

Hi, I am learning about spectral analysis, now I want to solve a periodogram problem in Matlab but I'm getting wrong results, don't know why. I'm working with an AR random process: x(n)=e(n)+(summation from k=1 to N of) (?_k* x(n?k)) e(n) is a white noise signal and ?_k are five given coefficients I plotted the power spectrum in Matlab for ? from 0 to ?. Then I generated the


Difference between sperically isotropic noise and spatially white noise

Started by maheshwarS in comp.dsp6 years ago 4 replies

I am reading about noise reduction techniques using arrays and I came across both these terms, I tried googling it up to find the...

I am reading about noise reduction techniques using arrays and I came across both these terms, I tried googling it up to find the difference between them. It would be so nice if someone can help me with this... :) --------------------------------------- Posted through http://www.DSPRelated.com