## Forums Search for: LPC

## LPC-10 vs. Texas Instruments LPC

inDoes anyone here possibly have detailed information on Texas Instruments implementation of the LPC algorithm for speech compression? I am in the...

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). From the data manuals I have, LPC-10 has 53 bits per frame plus a sync frame. TI LPC has 49 bits (n...

## Difference between LPC & LPC vocoder

inI'm doing a speech recognition project. Can LPC vocoder be use for speech rocognition? Can anyone help me with the differences between LPC and...

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 so sure about cross corelation as i've read somewehre, they say use auto correlation and covarian...

## using lpc to interpolate

inHi Could anyone help me on how to use lpc (linear prediction coeff) for interpolation ? I have a vector where some elements(samples) are...

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 wondered if I could use lpc to estimate replacements for those but I don't know how to incorporate the neighbouring (those before and after)samples to estimate the new ones. Matlab has a function called 'lpc' but I am a...

## 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...

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. N = 2560; [x,fs] = wavread('lpc.wav',N); % any speech signal can be used p=12; a = lpc(x,p...

## LPC spectra estimate

inI 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...

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 signal can be used p=12; a = lpc(x,p); X =fft(x); X = X(1:N/2+1)'; X = 10*log10(abs(X).^2); Z...

## LPC and LSF

inDear Firndz I have one querry regarding the LPC and LSF parameters Why we compute the LSF paramenter when we already had computed the...

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 can annalyis is that Numbers of LPC coefficent can be represented by the less neumber of LSF paramet...

## LPC Coefficients

inDear Readers, I am currently working on some "speaker recognition" software which will be using LPC coefficients for feature extraction. I...

Dear Readers, I am currently working on some "speaker recognition" software which will be using LPC coefficients for feature extraction. I have written an algorithm but have no means by which to test it because of lack of availability of existing LPC code. I would greatly appreciate it if someone could send me some input data, and output data for LPC (maybe 20 pieces?). I am using the c...

## 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...

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

inHi 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...

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 where one trace is missing and use the lpc to give an estimate of the missing trace. Thanks in adv...

## Speech modulation using LPC

inHi, 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...

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 my best to grasp it. Data -> LPC Decoder -> TX speech like signal -> Rx speech like signal -> LPC

## 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...

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 pitch detector rite? The pitch detector which is to detect voice, unvoiced is for the synthesis part....

## Formant detection

inHi, 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...

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 after counting LPC coefficients and some other coefficient G. My question is if somebody has an jav...

## LPC codec for dummies...

inHello everyone, firstly, this is my first post and I am completely new to DSP. I was previously only interested in graphics/trigonometry...

Hello everyone, firstly, this is my first post and I am completely new to DSP. I was previously only interested in graphics/trigonometry problems, however, I'm currently very interested in developing a LPC codec for my own hobby. I know this is a complex problem, and perhaps not the realm of an enthusiast, but I hope it is never too late to learn. I have read several papers; Park-LPC-tuto...

## 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...

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 MFCC? bcos after trainned them with neural network. THe result i got compared to MFCC, LPC vocoder sh...

## LPC using cumulants

inHi All, I want to implement LPC using cumulants (instead of LPC using autocorrelation ) algorithms in C. Where can I find that algorithms. some...

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 and voice reconstruction

inHello everybody. I'm doing some programs that treat human speech. As part of my project, I want to do a module that extracts the LPC...

Hello everybody. I'm doing some programs that treat human speech. As part of my project, I want to do a module that extracts the LPC coefficients of a piece of speech, and I'd want to find an algorithm to reconstruct a waveform that could sound, aproximately, as the original sound that I take my LPC coefficientes from. I've recorded my voice, saying a vowel, for example, something li...

## Windowing problem before LPC

inWhy window the signal before computing LPC coefficients? What is the whys of windowing? I know windowing can prevent spectrum leakage,but...

Why window the signal before computing LPC coefficients? What is the whys of windowing? I know windowing can prevent spectrum leakage,but LPC is none of business of FFT, so it has no spectrum leakage. Any comments would be appreciated!

## Where to find the description for LPC -10 algorithm

inDear 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...

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-1015/NATO-STANAG-4198 based 2400 bps linear prediction coder (LPC-10) was republished as a Federal ...

## LPC Matlab demo, help needed for 16khz signal

inHello I have 16KHz signal, i want to use "LPC Analysis and Synthesis Model in Matlab" "dsplpc" to perform a simulation of LPC. I am having...

Hello I have 16KHz signal, i want to use "LPC Analysis and Synthesis Model in Matlab" "dsplpc" to perform a simulation of LPC. I am having problem in defining frame length and buffer size, the output is not of good quality and it sounds like a signal sampled at 8Khz. I found that the signal behaves to be WSS at about 310 samples using the spectrogram utility. So then I used samples / ...

## LPC in physiological sense

inWe can attain the all pole system function of speech from linear prediction(LP). But how to correspond it with the digital model...

We can attain the all pole system function of speech from linear prediction(LP). But how to correspond it with the digital model in physiological sense? Where can i download such literature discussing the relation between them in detail? questions: 1. what is the counterpart of the lpc all pole model in physiological sense? 2. what is the counterpart of the input of lpc all pol...