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Difference between LPC & LPC vocoder

I'm doing a speech recognition project. Can LPC vocoder be use for speech rocognition? Can anyone help me with the differences between LPC and LPC vocoder? I'm looking at the code which i found in the net and it seems that LPC method were used in LPC vocoder and it is dealing with pitch. I'm not...

LPC-10 vs. Texas Instruments LPC

Does anyone here possibly have detailed information on Texas Instruments implementation of the LPC algorithm for speech compression? I am in the process of writing an LPC-T1 and LPC-10 encoder/decoder library in C# and I have Andy Fingerhut's LPC-10 code (which is in C, converted from Fortran). ...

warped lpc cepstrum

Hi, I'm wondering if I can use standard LPC -> Cepstrum recursion proposed by Atal for warped LPC. What kind of error do I produce if it is wrong? Cheers, Kosta ...

lpc on seismic traces

Hi Need help to use matlab's lpc (linear prediction coefficients) on a set of seismic traces. If data is given in a matrix where each column represents a seismic trace (time is the vertical axis and space the horizontal) how do I use matlab's lpc ? I am in particular interested in cases wher...

Formant detection

Hi, I'm trying to implement an algorithm in Java for detecting the formants in a speech segment. I've found an information, that is a good way to detect it is from spectral envelope, which I can get as power spectrum from LPC. So what I need is to count the power spectrum for LPC, which I get af...

LPC and LSF

Dear Firndz I have one querry regarding the LPC and LSF parameters Why we compute the LSF paramenter when we already had computed the LPC coefficeint. As far as I know all the relevent info is embeded in the LPC coefficent then why we compute the LSF parameters ? Only on thing I ca...

LPC using cumulants

Hi All, I want to implement LPC using cumulants (instead of LPC using autocorrelation ) algorithms in C. Where can I find that algorithms. some formulas or c code. ...

lpc vocoder.clarification needed.pls

Hi i'm using lpc vocoder for my speech recognition. If i'm doing only alphabet A-Z, I only need the encoder part. Is that correct? As i know, lpc vocoder determine the lpc analysis and pitch detector. If i wan to get the coefficients only for my neural network recognition, I dun need the pi...

New to MFCC & LPC vocoder. Pls help

I'm new to speech recognition. I would like to ask after generating MFCC, we get the coefficients. What do these coefficients means? Do they represent the amplitude of the speech signal accordingly? Can LPC vocoder use for speech recognition? Is this method better than LPC and LPCC? or even MF...

LPC spectra estimate

LPC spectra should correspond with the envelope of DFT spectra. I plot LPC spectra with matlab. The LPC spectra keep the same shape with the envelope of DFT spectra. But it is larger with a offset than the DFT envelope. Why? Where it go wrong? Here is the matlab script which illustrate it...

Teaching Assistant seeking help.

Dear Sirs I am a teaching assistant at MSU, and have volunteered to create new labs for the ECE Senior Design class. I would like to make the intial project a real-time LPC encoder/decoder. I would have the students play with the pitch value, so they would learn about LPC and also get excited a...

Question about LPC analysis and noise suppression in speech

Hello, I conducted an experiment in MATLAB related to noise suppression. I have a noisy speech segment X=S+N where S is clean speech and N is noise. I did LPC analysis of a frame of X and obtained an estimate of a noisy excitation (residual) signal u_noisy. I also did LPC analysis of a...

Re: LPC Coefficients

Hi, I am using an autocorrelatoin method using the Levinson recursion. The algorithm I am using is adapted to java from some non-java code I found in a book. Do you know anywhere that I might find another basic LPC algorithm to test my own. Thanks, Tom wrote in message news:1107...

LPC spectra estimate

I plot LPC spectra with matlab. The LPC spectra keep the same shape with the envelope of DFT spectra. But it is larger with a offset than the DFT envelope. Why? Where it go wrong? Here is the matlab script which illustrate it. N = 2560; [x,fs] = wavread('lpc.wav',N); % any speech signa...

RLS and LPC comparison

Hi All, I have implemented a 10th order Recursive Least Squares filter on Matlab for speech and am comparing the weights thus obtained with the weights using the LPC function. Then I am comparing the speech quality using PESQ MOS values for various speech files. I run my RLS for lambda=...

LPC for Analysis of 2 Speech Signals

Hi All, I am trying to find the best way to analyze 2 speech signals from 2 different speakers and come up with a 'match percentage' as to how close they were (ie, did the speakers say the same thing). I have been reading that LPC is great for encoding the basic parameters of speech, but mo...

Where to find the description for LPC -10 algorithm

Dear all, I have downloaded the source code for LPC-10 algorithm. But it maybe a little difficult for me to understand the source. So I want to find some materials about this algorithm. These two papers will be helpful, but I can't find them on Internet. 1) The U.S. DoD's Federal-Standard-1...

Regarding LPC to LSF conversion

Hi All, I into iLBC codec.I understood the basics that why the LPC coefs are transformed into LSF theortically, but I find it difficult to understand mathematically. Pls help me with the maths associated with it and links if any. Pradeep ...

Speech modulation using LPC

Hi, I am trying to produce a speech based signal from arbitrary values by using LPC technique. My goal is to convert any data into speech like signal, send it to remote end and then reconstruct the data from the speech signal. I am basing my ideas from a paper. I am new to DSP but I am trying...

speech to LPC coefficients

hello can anyone post me a C code for converting the original speech to its LPC coefficients and then to the LSP. Or just tell me the procedure to do it ..thanks This message was sent using the Comp.DSP web interface on www.DSPRelated.com ...

Re: using lpc to interpolate

Kamran wrote: > Rune Allnor wrote: > > > > Kamran wrote: > > > > > Hi > > > > > > > > > Could anyone help me on how to use lpc (linear prediction coeff) > > > for interpolation ? I have a vector where some elements(samples) are way > > > off what is reasonable and wonder...

LPC Question

In LPC we estimate a 10th order all pole model of quasi-stationary speech. The predicted speech is then y(k)=-a1y(k-1)-a2y(k-2)....-a10y(k-n) Is the 'gain' estimated at all ie the variance of the driving noise of the AR model? Also is this really a predictor? It is not a Wiener predictor ...

Re: Windowing problem before LPC

On Mar 16, 11:08=A0pm, Vladimir Vassilevsky wrote: > hyeewang wrote: > > Why window the signal before computing LPC coefficients? =A0 > > > What is the whys of windowing? =A0I know windowing can prevent spectrum > > leakage,but LPC is none of business of FFT, oh? > > so it ha...

gaussian mixture model

i really need help. i'm doing a voice morphing project and is in need of help with the gaussian mixture model method. i know i will need to process an audio file into lpc datas and then using the lpc format to create a codebook. however, i do not know what comes after that. what am i to do so...

GMM morphed.

Hi all, can anyone help me with this? If i were to carry out a Gaussian Mixture Modelling on an LPC data, after that using the resultant i undergo some level of morphing. would i still need to do any reverse GMM on the morphed data in order to get back an LPC format? If yes, can someone roughl...

Re: unclipping

On 3/4/12 8:12 PM, glen herrmannsfeldt wrote: > I have a digitized WAV file about 71 minutes long (actually, 10 > files totaling 71 minutes) with three samples clipped, I believe > not all consecutive. only three isolated samples? they're at 0x7FFF or 0x8000 ? > > I can't actually he...

Speech identyfication...

Hi!!! I have problem with speech identyfication. I use LPC algorithm and extract reflection coeficient (rc). I have this 10 rc and try to identify the person using it. The problem is how I can do this with this rc??? I used Euklides distortion measures but I do not know what can I do next with ...

Re: Please Recommend Book on Audio/Speech

The modem speech coding is based on the LPC algorithm in the time domain , multiband algorthim in the frequency domain. LPC based speech codecs are EVRC, QCELP13, AMR series, and ITU-T G.723.1, G.729 series. multiband speech codec are IMBE, and AMBE. The audio coding is based on FFT, MDCT bas...

LPC cowfficient freeze

In recent past there was a suggestion thrown to me to freeze the LPC coefficient to save computation cycles and the "rational" is speech is stationary in nature! The application is a vocoder. I was shocked and still remain shocked but if you guys have an o...

STUPIDENT::Re: LPC in physiological sense

HyeeWang wrote: > On Jul 24, 2:36 pm, HyeeWang wrote: > > > The all pole model is as follows. > > H(z) = G/(1-sum(ak*z.^k)) > > where, a is the lpc coefficients. > > > > The physiological digital model is : exitation system + vocal tract > > system + radiation system. > > ...

Question: linear predictive coding, spectral estimation

Hi I have a question about LPC-analysis. I have a frame of 256 speech samples which I assume is the output of an IIR-filter and I do LPC-analysis of the frame to obtain the coefficients of the IIR-filter. I want to do a comparison of the non-parametric power spectrum (by use of FFT) and ...

Re: too many combinations: Transition probability etc.

John wrote: > I am trying to do some statistics, but I don't know how to solve the problem > I am working on. > > I have N speech segments and I perform a 10th order LPC-analysis of each > segment and get a 10-dimensional LPC-vector A(j)=[a1(j),a2(j),....a10(j)] > for j=1 to N. > ...

Re: Speaker recognition software

hi guyz , im just a starter on speaker recognition using LPC , need some real tuts on it and any guidance regarding the programming in c - language. any advice would be helpful, thatd be helpful for the original author of the post 2. so if u have anythn to share plz do. email me on...

Voice conversion

Hi, I'm doing a project on Voice Morphing in JAVA. And I am new in DSP stuff. I am wondering if you could help me with the concepts behind this. Voice morphing converts the words of the source speaker to be spoken with the voice of the target speaker. e.g. input : Source speaker says "Hello" ...

Re: fastest way of calculating the roots of a polynomium??

John wrote: > > Why do you want them? If it is to check for stability, that is > > It is not to check for stability....It is because I am more interested in > finding the roots than the LPC-coefficients. If I have the roots I can > quickly calculate the LPC-coefficients if I want t...

Re: Block Processing Issue

> What type of signal are you filtering? A noise degraded speech signal x=s+n where s is clean speech and n is colored, gaussian noise. > How important is continuity? I don't know to be honest. Maybe you can tell me why you ask that particular question? > How/why are the coefficie...

Question regarding LPC Difference equation

Hi, I was going through the Source filter model of speech production given in "Digital Speech" by author Kondoz. The LPC sysnthesis filter looks like : H(z) = G / A(z) where, A(z) = 1 - SUM{a[j]*z^-j} ; j running from 1 to 10 for speech synthesis. If we transform the above ...

pitch synthesis and lpc codebooks and excitation signal

I am trying to use gsm network to send secure data encoded as voice. For this purpose during my initial research I used 8 bits as lpc codebook index and 4 bits as pitch index. I used these 12 bits to produce 160 samples of voice like data. I am new to dsp so using my limited knowledge I generated...

Re: Power Spectral density

Real_McCoy wrote: > "Stan Pawlukiewicz" wrote in message > news:dkiffa$ic7$1@newslocal.mitre.org... > > > Lars Hansen wrote: > > > > > > Fourier transform of a random process is another random process :) > > > > > > > > what you need to do is perform the above several dozen times (a...

Re: regarding white noise

> I want to know why white noise floor is added to the autocorrelation > function in the lpc analysis. I'm not an expert with LPC, but I know with adaptive dsp, you need to keep the inverse of the autocorrelation matrix stable. This is especially true with highly self-correlated signals. ...