Adaptive Filter | ADPCM | ADSP | ADSP-2181 | Aliasing | AMR | Anti-Aliasing | ARMA | Autocorrelation | AutoCovariance | Beamforming | Bessel | Blackfin | Butterworth | C6713 | CCS | Chebyshev | CIC Filter | Circular Convolution | Code Composer Studio | Comb Filter | Compression | Convolution | Cross Correlation | DCT | Decimation | Deconvolution | Demodulation | DM642 | DSP Boards | DSP/BIOS | DTMF | Echo Cancellation | Equalization | Equalizer | ETSI | EZLITE (Ez-kit Lite) | FFT | FFTW | FIR Filter | Fixed Point | FSK | G.711 | G.723 | G.729 | Gaussian Noise | Goertzel | GPIO | Hilbert Transform | IFFT | IIR Filter | Interpolation | Invariance | JTAG | Kalman | Laplace Transform | Levinson | LPC | McBSP | MIPS | Modulation | MPEG | Multirate | Notch Filter | Nyquist | OFDM | Oversampling | Pink Noise | Pitch | PLL | Polyphase | QAM | QDMA | Quantization | Quantizer | Radar | Random Noise | Reed Solomon | Remez | Resampling | RTDX | Sampling | Sharc | TI C6711 | Undersampling | Viterbi | Wavelets | White Noise | Wiener Filter | Windowing | XDS510PP | Z Transform

Re: MATLAB code for Power Spectral Density

> > "ngeva0" wrote in message > news:E5ednYmLdYH7tQbeRVn-gg@giganews.com... > > > > > > > > > %Bandwidth > > > > > BW=1.5*Fs*numsample; > > where did you derive this from? > Fs/numsample is the width of each of the frequency bins in the FFT output > where does the 1.5 come f...

Re: scaling fixed point fft

Celeb Lover wrote: > I am not following the "headroom" discussion below (last paragraph). I > don't see that any scaling of the input downwards is necessary other than > a possible slight adjustment of the inputs that will completely avoid > overflows. So I do not see the necessity for the...

Proof regarding autocorrelation of a pulse in white noise

Let x[n] = s[n] + p[n] where s[n] is complex Gaussian white noise (GWN) and p[n] is a complex signal in the for Ae^{j2pi w + phi} where w is radian frequency and phi is a phase factor. I want to show that if I do the autocorrelation of x[n] (ie x[n]x[n-1]* , where * denotes the complex conj...

Re: Blackfin FFT precision

Ed wrote: > The 32 bit data types of the Blackfin processors should preserve more bits > of precision than a 16 bit fixed point processor, if the FFT routines make > use of the 32 bit data types. Can anyone comment on whether this is the > case, and how well the precision is maintained in...

1/f noise generation

Hi All, Is there anyone know how to generate 1/f noise for simulating the phase noise. Someone told me though passing a white noise to a FIR the noise can be generated. Any clue about the FIR? Thanks alot R. Y. ...

Discrete time PLL - mean time between slips

Hi guys, Can anyone point me to a paper/book describing the analysis of the discrete time PLL? All I could find are books describing the nonlinear analysis of the continuous time PLL -- an analysis that is based on nonlinear differential equations. A discrete time analysis avoids the dif...

Re: question about non-uniform sampling?

lucy wrote: > Hi all, > > Can non-uniform sampled signal be used to perfectly reconstruct the > original continuous time signal? > > What is the Nyquist sampling rate in the non-uniform case? > > Thanks a lot! > > -L I read about half the posts here so I hope I am not missin...

FM modulation with a PRN code.is it a way for generating white noise

My carrier freq is 1.575GHz.PRN code is generated by a 168bit length LFSR.So the code tends to be a random sequence.Clock to LFSR is 1 MHz.So I wanted to know that how the FM spectrum look like.here the modulating signal will be like sqaure wave with randomly varying duty cycle.Frequency spectru...

Re: Quantifying Signal Loss

Thanks, Rune. Now I can stop banging my head against the wall...for now. I am mostly working with vibrations of equipment induced by a range of road conditions. I have created several test data files (sine waves, white noise etc.) and having been turning 'knobs' to see the effects of the forem...

Time delay estimation question

I have read quite a few papers on teh subject and have a question. Suppose we have two sensors x1 and x2 x1(t)=s1(t)+n1(t) and x2(t)=a.s2(t-D)+n2(t) where n1(t) and n2(t) are uncorrelated white noise sources also uncorrelated with the two signals s1 and s2. I need to find the delay ...

Re: problem with reference signal in LMS algoritm

Ralph, The reference signal is not going to be another generated white noise signal. To work the two white noise signals would have to be correlated. The reference signal will commonly be a delayed version of the noisy input signal (which you said you tried). The delay would normally be a m...

Re: Simple AGC (automatic gain control) algorithm

Thanks a lot Tom! It really works, and it is really simple. I had some experiments in Matlab and have a couple of questions. How to make the level that I need? When I have spoint=1, then amplitude of signal is some 1.5 (pure sine wave at AGC input). What spoint stand for? Is it the DC (a...

Re: PM demodulation

I apologize for my quick presentation of the problem, I didn't want to overload the occasional reader with a in depth exposition of what I'm really doing because otherwise the lengths itself of the explanation would have scared him/her away. What I'm actually doing is a little bit different th...

Re: Automatic RF noise cancellation and audio noise measurement

Dave, Thanks for the info. In my case, the source seems to be a bank of 4 transformers on a pole about 300 feet away. Weirdest thing I had was S9 white noise from about 40 to 55 MHz with about 50% amplitude modulation at around 50 KHz. Turned out to be a 60 amp cartridge fuse in my fuse box ab...

Re: Coding for adjusting entropy

"James K." wrote in message news: ... > "Mahesh Godavarti" wrote in message > news:d4cb12a3.0308110238.111c965a@posting.google.com... > > Your understanding that is shown in your two questions is perfectly > exact to what I intended to ask previously in the reflector. However, > ...

Re: name of fft(log(fft())) algorithm?

"Fred Marshall" wrote in message news: ... > "Rick Lyons" wrote in message > news:3f3faede.82466578@news.west.earthlink.net... > > On 16 Aug 2003 02:36:52 -0700, akumar.elex@dauniv.ac.in (abhay kumar) > > wrote: > > > > > Ronald H. Nicholson, Jr. wrote in message > news:...

Re: How do you detect the broadband noise level?

jason_hsu@my-deja.com (Jason Hsu) wrote in message news: ... > The traditional diode detector does not distinguish between broadband > noise and narrowband signals. > > Is there a way to detect the overall broadband noise level? In this > coming semester, I will be working on an automat...

Fitting AR model to stohastic signal

Hi I have a sample of a Stohastic signal with very slowly variable mean, and would like to find AR model for it perhaps using Burg parameter estimation model (explained in book by Kay). I would like to try diffent model order until I get the Power spectral density of white noise driven AR mode...

Shannon's channel capacity with arbitrary noise!!

Hi all, It is not very common to discuss Shannon's channel capacity with an arbitrary noise. I guess we are more familiar with Shannon's channel capacity perturbed by white Gaussian noise. I also think there had been lot of discussions with Shannon's limit,Shannon capacity etc. previously. M...

Re: OT integral of odd function

Hi Eric. Eric> You can also make nice examples for FEC analogies with Eric> puncturing (deleting characters or words, and it's much easier Eric> if you know that there was a deletion rather than having to Eric> guess at their locations), and errored substitution, etc. When Eric> people ...

DC shift of the h(impulse response of the room) when using NLMS adaptive filtering

Anyone encountered this problem when using NLMS? The h shifts up after running for sometime, I noticed this for both white noise and color voice signals. What caused the shift and how to avoid it? thanks Andrew ...

Re: SNR of multiple sinusoids

"Dougal McDougal of that Elk" wrote in message news:4yJKf.151744$vH5.1305196@news.xtra.co.nz... > > "Fred Marshall" wrote in message > news:jOqdnXhBoYq5_GbeRVn-gg@centurytel.net... > > Here's a question that came up recently in a project I'm working on: > > > > Assume that you ...

Re: STFT vs Eigen analysis

Hi Rune. Rune> Eh... people who rely on the Matlab Signal Processing Toolbox Rune> would have to do something like this... I implement these things Rune> myself. I find I have to, to get the detailed control needed to Rune> get the job done. But then, there may be good reasons for this R...

Re: Is White Noise Necessarily Zero-Mean?

Hi, > This thread seems to be converging to agreement with Randy's > assertion that the common definitions of white noise seem not > to necessarily imply that the process has zero mean. Actually I (as well as dvsarw) was saying just the opposite. If the process is WN than it *must* be zer...

Re: OT? -- How far can linear supperposition be stretched

Richard Owlett wrote in message news: ... > [ CAVEAT any term enclosed by "..." is used EXTREMELY loosely ] > > Given: > 1. a non-periodic signal to be "characterized" > [ "analyzed" implies much too much precision ;] You want just a basic "feel" of what's going on? > ...

gaussian white noise using only integer arithmetic

Hi Guys, I need to generate gaussian white noise on an integer DSP. I have the fast Numerical Recipes generator but it has a log, a sqrt and divides in it. Does anyone know where I can find one or where I can read about how to write one? Thanks Dimiter ...

Re: Correlated antenna gain

taqai@hotmail.com (taqai) wrote in message news: ... > If we have a transmitter antenna and M receiver antennas > then it is well known that by using maximum ratio combining > an M-fold improvement in the SNR can be obtained. > > But what if the receiver antennas are correlated and the ...

Can DSP be programmed to help with my hearing problem ?

Can a DSP system help me? ... I have been diagnosed with severe tinnitus (ringing in the ears) and hyperacusis (sensitive to loud noises). After attending a play last night with earplugs in to prevent further injury and pain, and not being able to hear anything anyone was saying, I thought ther...

Dthering....

Hi, I've a question about dithering in the digital domain. Let's say I've to quantize a signal from 12 bits to 8 bits. 1) Does it make sense to apply dithering at all? 2) The noise (dithering) signal, must be real noise, or it is enough to be just an uncorrelated signal? For 2) I m...

easy estimate of bandwidth?

Hi all! I would like to have an fast, easy method to esimate the bandwidth (or kind of degrees of freedom) of a given piece of signal. Lets say, if there is a sine wave, that number should be very low (or zero), if there is white noise, it should be 1 (or something defined). Signal piece...

Re: Sick of sample-based "synthesis"!

glucegen@excite.com (Radium) wrote in message news: ... > Sample-based synths are stale and rigid. Any sound effect in action > will noticeably quantize and alias the music. They are a hell an > earsore for life-wanting instruments such as synth pads and synth fx. > The tone of synth pads a...

Rigorous definition of the Spectral Density of a random signal?

Hi, I know this question is not 100% relevant to this newsgroup, as I'm talking about continuous-time signals, and not DSP... But I couldn't find a more appropriate place to discuss this. Anyway, there was a big discussion in one of my classes about some characteristics of white noise, an...

Re: FFT normalization/scaling to db

These numbers are in the famous Harris paper listed in the FAQ. Have you looked there? Getting these numbers right is tricky. There are two kinds of normalization, one where you make the amplitude right for a sine wave and one where you make the noise power right for input white noise. ...

any good model for quantization error? how to design my quantization matrix?

Dear all, I am studying some problem of the quantization error in customed designed quantization matrix for JPEG(the quantization matrix was designed by me, so it is worse than standard JPEG in terms of quality). I am trying to design a filter to remove these error due to quantization. Current...

RBJ peaking filter -- off by 2 X

hi, i've been messing about w/ the peaking filters in RBJs eq cookbook and everything has been great. .... my test is to generate a bunch of white noise with a uniform distribution. and take before and after "frequency analyses" of the peaking filter (using a big blackmanharris window and ...

Re: How can I remove white noise from my signals?

Those algorithms for Speech Enhancement may be able to fix your problem. And if the noise is stationary, the simplest spectral substraction with a simple VAD will be OK. > Dear Colleagues, > > I have a problem. I have velocity signals x(t) recorded with an acoustic > Doppler velocimeter. Thes...

Re: lloyds mirror effect

rahul1 wrote: > hi all > i am interested in the lloyds mirror effect and its applications in > sonars. can someone kindly refer me to somewhere i could read up on it. > thanks > rahul > The basic effect is due to 2 signal paths of different lengths. When a broadband (e.g. white n...

Re: LPC question

Hi hanspi, Your reply to the question by jack on LPC has really interested me. I still dont get exactly what you are trying to tell. I think my interpretation of u(k) being equal to e(k) is wrong and I want to correct myself. Can you please elaborate on this concept of LPC please? Please exp...

Image Processing and Human Perception of Distortion

I have a very fundamental question about image processing and distortion. Suppose that we have two images: I[i,j] and J[i,j], where "i" ranges from 0 to 1919 and "j" ranges from 0 to 1199. Suppose that we create J[] from I[] by adding uniform white noise at each pixel of the image. Assume t...

Gaussian white noise code in C

Hello all, I'm in need of a C program which implements the Gaussian white noise algorithm in C. The program is to accept a binary file as input and alter it according to the algorithm. I'm affraid this project must run on Windoze :( Thank you in advance Jess ...