## Forums Search for: Quantization

## Wave-to-Wave Recording. Noisy on Low Volume!

inWhy is it whenever I record from one wave file - at an extremely low volume - another wave file, I get noise? The process is completely...

Why is it whenever I record from one wave file - at an extremely low volume - another wave file, I get noise? The process is completely digital. There is no analog, no D-A, and no A-D. Why the #%!$@%!@# is their noise? Since this is not analog-to-digital, this is obviously *not* quantization noise. Quantization noise only occur during A-D conversion when the input volume and/or bit-resol...

## Vector Quantization query

inHi, I'm currently coding an adaption of the LBG vector quantization algorithm. At the point where you have attributed each vector to one of...

Hi, I'm currently coding an adaption of the LBG vector quantization algorithm. At the point where you have attributed each vector to one of the code vectors, you must calculate the centroid of those vectors to become the new centroid of the code vectors. My question is this. If no vectors have been attributed to that particular code vector, then do you simply leave the code vector a...

## Newbier question

inHi, What is the form of Quantization Noise as a function of time? A.L.

Hi, What is the form of Quantization Noise as a function of time? A.L.

## Vector Quantization using genetic algorithms

Hi everybody, I'm working on Image compression using VQ, does anyone have a C/C++ code for VQ implementation using GA? Appreciate your...

Hi everybody, I'm working on Image compression using VQ, does anyone have a C/C++ code for VQ implementation using GA? Appreciate your feedback

## need abook for......

inany one please know a clear book talks about (quantization,puls code modlution,encoding, chaneel capacity) any one know please

any one please know a clear book talks about (quantization,puls code modlution,encoding, chaneel capacity) any one know please

## help

i wish to do isolated digit recognition using hmms using matlab. if somebody can tell me the exact process flow after front end(mfcc) and vector...

i wish to do isolated digit recognition using hmms using matlab. if somebody can tell me the exact process flow after front end(mfcc) and vector quantization then i would be grateful.

## ENOB and bit dropping

inIf I have a 14 bit ADC with an ENOB of 12bits, can I simply drop two bits from each and every sample ? If so, have I further increased my...

If I have a 14 bit ADC with an ENOB of 12bits, can I simply drop two bits from each and every sample ? If so, have I further increased my quantization noise ? What are the benefits and penalties to this ?

## Arranging biquads

inHello all ! Considering IIR filtering with fixed-point DSP : How to arrange biquads to reduce roundoff or quantization noise ? If anyone...

Hello all ! Considering IIR filtering with fixed-point DSP : How to arrange biquads to reduce roundoff or quantization noise ? If anyone has resources, advices or links ! Thank you.

## VQ using lbg algorithm

Dear friends, I am working on AUTOMATIC SPEAKER RECOGNITION.I tried writing the code for Vector Quantization but was...

Dear friends, I am working on AUTOMATIC SPEAKER RECOGNITION.I tried writing the code for Vector Quantization but was unsuccessful.If you have the code for VQ please inform me

## GPS Quantization Levels

inHi, I have been pondering about this all day and I think I need some clarification. In current GPS systems the post-IF A/D uses 1-2 bits. ...

Hi, I have been pondering about this all day and I think I need some clarification. In current GPS systems the post-IF A/D uses 1-2 bits. Since in GPS signals the SNR is -19 how can this be enough resolution to recover the signal? I am sure it has to do with DS-SS but I have not been able to find a good source that can explain the choice of levels. If anyone has any clues please let me kn...

## Re: How do I Calculate Log Energy?

Yes, it was the 1/N factor I was remembering or not remembering as the case may be. Like I said, when I was introduced to this part of DSP, it...

Yes, it was the 1/N factor I was remembering or not remembering as the case may be. Like I said, when I was introduced to this part of DSP, it was given that 1/N is known to be needed to "close the loop", but there is no rational for where you include it. As to the other conversion factors, yes, they are there, but that is just a matter of the quantization levels established by

## Q format

inI am kind of new to DSP stuff....i want to convert 1/211 in to Q format. Can any one tell me how to find it. And I need to find the quantization...

I am kind of new to DSP stuff....i want to convert 1/211 in to Q format. Can any one tell me how to find it. And I need to find the quantization error in general for any number how do i do tha??? Thanks, Rohini.

## Re: Theoretically Highest Quality of PCM Audio

> > If I am given a 16-bit fixed-point number of uniform quantization, I > can surely say that the maximum theoritic dynamic range I can get...

> > If I am given a 16-bit fixed-point number of uniform quantization, I > can surely say that the maximum theoritic dynamic range I can get is > 96.329 dB Minor quibble... 96 dB is 6 dB per bit for 16 bits...the max signal is really +-32767 or +-15 bits, right? so its 90dB....

## Integer FFT

inHi all, I am new to the DSP area. Currently I am trying to understand the integer FFT algorithm. But after going through the document I am...

Hi all, I am new to the DSP area. Currently I am trying to understand the integer FFT algorithm. But after going through the document I am not clear about the uplifting and quantization of the twiddle co- efficient's by using which the multiplication operation is converted into the shift and addition operations. Eagerly waiting for reply. Thank you in advance.

## sigma-delta : unintuitive

inI am finding the sigma-delta adc difficult to understand. The only way, i feel, to reduce the quantization noise , given the bit-resolution ,...

I am finding the sigma-delta adc difficult to understand. The only way, i feel, to reduce the quantization noise , given the bit-resolution , is to sample non-uniformly. Is that what happens ? shankar

## fir coefficient quantization equation

inHello, I am looking for a closed form equation for coefficient bits, when passband ripple, stop band attenuation and number of...

Hello, I am looking for a closed form equation for coefficient bits, when passband ripple, stop band attenuation and number of coefficients are specified. Only for FIR filters. Regards Bharat

## quantization

inHi I have a 10-dimensional vector v(t)=(C1(t),C2(t),......,C10(t)) where Cj(t) is between 0 and pi for any t. I let t run from t=0 to t=T...

Hi I have a 10-dimensional vector v(t)=(C1(t),C2(t),......,C10(t)) where Cj(t) is between 0 and pi for any t. I let t run from t=0 to t=T and get a set S of vectors S={v(0),v(1),.....,v(T)} How do I map this set S into a discrete set D ? And how do I calculate the probability of any discrete vector in D? Thanks...

## expectations from a DFE ?

inHi, I've been experimenting with adaptive filters for channel equalization and I have a problem with decision feedback case. Initially I...

Hi, I've been experimenting with adaptive filters for channel equalization and I have a problem with decision feedback case. Initially I started with a T/2 fractional linear equalizer adapted with LMS and then converted this to delayed LMS with two delays. I am currently not adding any noise just trying to compensate for the ISI generated by the channel although there is quantization error a...

## non linear quantization

Hi there! Can anyone help or give reference about this problem: what quantification scheme will be used and how will it be implemented when...

Hi there! Can anyone help or give reference about this problem: what quantification scheme will be used and how will it be implemented when i try to render an image in a cellphone screen considering a certain correction intensity of a square function f(x)=255*sqrt(x/255) and x ranging from 0 to 255 which represents image intensity? i really do appreciate any input. thanks much, mous...

## How to automatically check if a filter meets specs

inHi, I'm trying to optimize the coefficients of a filter in Matlab. I have the code that generates zillions of H(z) for various quantization level...

Hi, I'm trying to optimize the coefficients of a filter in Matlab. I have the code that generates zillions of H(z) for various quantization level of coefficients etc...Now I would like the same script to tell me which ones of those filters still meet my specification (passband and stopband attenuation etc...). I usually use fvtool(H) to eyeball the frequency response, but now that I have so many...