## Forums comp.dsp

## Is there another name for Baseline Wander ?

inHi, I am interested in a baseband digital communications system (Gigabit Ethernet). The signal spectrum is baseband and there are...

Hi, I am interested in a baseband digital communications system (Gigabit Ethernet). The signal spectrum is baseband and there are isolation transformers at both ends of the channel (cat5 cable). So one of the channel impairments that the transceiver must deal with is baseline wander. ie if there are a long string of 0's (or 1's) the signal begins to look like DC (0Hz) and this will not pass th...

## Audio output distorted with any FFT windowing other than rectangular

inHi, For an experiment i have a simple application that takes a quadrature signal from a radio and then does the following: Complex FFT -> ...

Hi, For an experiment i have a simple application that takes a quadrature signal from a radio and then does the following: Complex FFT -> Inverse FFT -> Cartesian to Polar -> audio out If I tune the radio to an AM signal I can demodulate it perfectly well by this but it depends on how the FFT is processed. In the FFT routine, I apply a window and if it is anything other than a rectangular wind

## Random Vibration Controller

inI'm looking for some guidance on how random vibration control is performed. I've read that the reference signal is a PSD (power spectral density)...

I'm looking for some guidance on how random vibration control is performed. I've read that the reference signal is a PSD (power spectral density) rather than a time domain signal. And that the feedback from the accelerometer (time block of data) is converted to the frequency domain by an FFT, and compared to the reference spectrum to close the loop. Then an IFFT is performed to produce the driv...

## Polynomials - Interesting

inHere's something you may not know. Suppose you want to expand in a power series a polynomial. Let's take a simple one a0+a1z^-1 Then if...

Here's something you may not know. Suppose you want to expand in a power series a polynomial. Let's take a simple one a0+a1z^-1 Then if you write a lower triangular toeplitz matrix [ a0 0 a1 a1] so that the first column is the polynomial coefficients then it's inverse becomes (1/a0)[1 0 -a1/a0 1] ie the first column is the power series expansion - or division...

## Understanding DSP or The Scientist and Engineer's Guide to DSP ?

I'm learning about GNU Radio and software radios in general. However, I just have very rudimentary knowledge about DSP (did a really basic...

I'm learning about GNU Radio and software radios in general. However, I just have very rudimentary knowledge about DSP (did a really basic college course) and the mathematics related to it. I picked up DSP for Communications (related to the DSP course on Coursera), and could not understand the math properly. I want to get started with GNU Radio quickly. So I'm confused which book to start learn...

## Array indexing in Matlab finally corrected after 30 years!

inI was glad to hear that Mathworks has finally corrected their array indexing scheme to start with 0 instead of 1, so they're now compatible with...

I was glad to hear that Mathworks has finally corrected their array indexing scheme to start with 0 instead of 1, so they're now compatible with all the other languages out in the real world. Apparently they knew all along that array indexes actually start at zero, but a bug in the initial release of the code caused the 'off by one' problem. An admission of such a glaring math error would ...

## Demodu-sooners

inWhy are comms professionals concentrating their efforts on demodulators? Wouldn't it be better to get ahead of the game and start designing...

Why are comms professionals concentrating their efforts on demodulators? Wouldn't it be better to get ahead of the game and start designing demodu- sooners? -- Tim Wescott Wescott Design Services http://www.wescottdesign.com

## Acceleration signal and Kalman filter

Hello All Posting here after long time! I have acceleration data along with corresponding quaternions. The goal is to remove the bias...

Hello All Posting here after long time! I have acceleration data along with corresponding quaternions. The goal is to remove the bias from the acceleration by using quaternions. I found an implementation where accelerations ax and ay are converted to Euler angles (Phi and Theta) and quaternions are also converted to Euler angles (Phi, Theta and Psi). Then these Euler angles are pass...

## implementation of phase shifted carrier wave PWM on TMS320F28335

Hi, I want to implement phase shifted carrier wave PWM on TMS320F28835. I am using this PWM pulses (12 nos.) to three phase NPC Inverter...

Hi, I want to implement phase shifted carrier wave PWM on TMS320F28835. I am using this PWM pulses (12 nos.) to three phase NPC Inverter (DC-AC Converter). Currently I am comparing three sine reference waves with two 20kHz carrier waves (one in positive half and one in negative half). Here, Positive half of each sine reference wave is comparing with the carrier wave (triangular wave) in positiv...

## removing dc offset from 24-bit sound samples

inhi folks, is there freely available C code to remove DC offset from 24-bit sound samples? I have tried modifying code that was released by...

hi folks, is there freely available C code to remove DC offset from 24-bit sound samples? I have tried modifying code that was released by robert bristow-johnson for use with 16-bit sounds, but I'm unable to modify it correctly for use with 24-bit sounds. any leads would be appreciated. Arun Chandra COM 301 Performing Arts The Evergreen State College Olympia WA 98505