## Forums

## Fire Codes

inI was studying the schematic of a 1970's era washing machine sized disk drive [1] wondering how it performed ECC. Everything was built out...

I was studying the schematic of a 1970's era washing machine sized disk drive [1] wondering how it performed ECC. Everything was built out of simple SSI TTL circuitry. The disk controller had a 13-bit register that provided the "Error Position" and another 12-bit register that provided the "Error Pattern". I couldn't find any explanation for how this circuit worked in any of the disk drive...

## I/Q modulation and phase noise sensitivity

inHi, I am observing something that is very counter-intuitive to me: I/Q modulation is very susceptible to phase noise? In an experiment I...

Hi, I am observing something that is very counter-intuitive to me: I/Q modulation is very susceptible to phase noise? In an experiment I plot "phase noise" vs. "SNR" and see a constant slope of ~20dB/dec. I use a real baseband signal, multiply it by cos(2*pi*fc*t) and then multiply it again by cos(2*pi*fc*t + phi(t)) where phi represents the phase noise. Finally, a simple image filter. I...

## In memoriam - Vladimir Vassilevsky

inHi, In the Russian culture it's traditional to formally remember a deceased family member, or friend, 40 days after the day of their...

Hi, In the Russian culture it's traditional to formally remember a deceased family member, or friend, 40 days after the day of their passing. Today it's been 40 days since Vladimir Vassilevsky left this world. My memory of Vlad, as his friends called him, is that he was a highly skilled engineer. Over the years of exchanging signal processing ideas with Vlad I had the distinct...

## Automatic (no user-parameters) envelope/peak follower

inI'm looking for known algorithms that do envelope/peak following with no user-specified attack or release times. Specifically I'm interested in...

I'm looking for known algorithms that do envelope/peak following with no user-specified attack or release times. Specifically I'm interested in what kind of algorithms something like: http://i.stack.imgur.com/gT4dw.png could be using (based on how it looks like). --------------------------------------- Posted through http://www.DSPRelated.com

## MATLAB - Digital Filtering in Second Order Sections - Scale Values

inHi Everyone, I am struggling to manually apply the scale values to a digital filter I designed in MATLAB using fdatool. I generated the filter...

Hi Everyone, I am struggling to manually apply the scale values to a digital filter I designed in MATLAB using fdatool. I generated the filter (IIR band stop filter consisting of four second order sections) and exported it as an object. I can use MATLAB's "filter" function to filter my data correctly. As a precursor to implementing the filter in C and embedding it onto a hardware device, I...

## LFCC (Linear Frequency Cepstral Coefficients)

It is used to extract the features in audio signal. It has steps Signal Normalization, Compute FFT power spectrum, Compute autoregressive model...

It is used to extract the features in audio signal. It has steps Signal Normalization, Compute FFT power spectrum, Compute autoregressive model analysis, Convert LPC to cepstra , Apply DCT and Convert to cepstra, Apply lifter to matrix of cepstra, Calculate the deltas of a output mel sequence . Can anyone briefly explain about LFCC and it's steps? Thankyou

## Need help in determining entropy of four coins - skewed distribution

inAll, I used to be a student of channel capacity years back. Now I am trying to teach concepts of information, entropy and channel capacity to...

All, I used to be a student of channel capacity years back. Now I am trying to teach concepts of information, entropy and channel capacity to my high-school kid for a school math project. I am coming across a situation in which the entropy of an (unequiprobable) event is coming out to be GREATER than had it been equiprobable. I am clearly wrong somewhere. Where? Background: (re

## BPSK one-bit

inDear group, I would like to implement a BPSK demodulator with one-bit signal processing. I will use an Hard limiting IF and 1-bit A/D...

Dear group, I would like to implement a BPSK demodulator with one-bit signal processing. I will use an Hard limiting IF and 1-bit A/D converter. It is for coherent RADAR, so I have the clk. I can sampling at maximum for time BW. Any idea? Thank you. Best regards. -- -- *Claudio Muzzini*Mob. +39 3484321716 *Perfekt ist nicht genug.*

## Expected time average of a stochastic process

Hi, This is a small followup from "Model for jitter on oscillator for downconversion" but since I think I am on the right track now, I have...

Hi, This is a small followup from "Model for jitter on oscillator for downconversion" but since I think I am on the right track now, I have a specific question here. Suppose I have the following stochastic process: cos(w t + phi) where phi ~ N(0,sigma^2). Now I want to calculate the expected "normalized mean squared" error over one period: e = (\int_0^T (cos(w t) - c...

## Model for jitter on oscillator for downconversion

inHi, Would someone be able to help me with jitter modeling? Empirically I get the following relationship between "LO jitter" and normalized MSE...

Hi, Would someone be able to help me with jitter modeling? Empirically I get the following relationship between "LO jitter" and normalized MSE (NMSE; which is roughly -SNR in this case): http://snag.gy/VNmkU.jpg I generated this plot using a simple simulink model: x0 -> filter -> y0 x0 -> *cos(wc t) -> *sign(cos(wc t + jitter(t))) -> filter -> y1 jitter is a function wh