Organize and Share your Electronics the way you want. Sign-Up for a free account now. It takes only 30 seconds!

Digital White Noise Source

Digital White Noise Source

Digital noise is a series of (more or less) random low/high pulses. Analog noise is an analog signal without any (apparent) order. There exist several types of noise, the most important ones being “white” noise, “pink” noise and “brown” noise.
White noise (which is not the same as Gaussian noise) is characterized by a flat spectrum, i.e. the signal has equal power in any frequency band (up to some bandwidth). Futhermore, it must have zero autocorrelation. For digital noise, this means that the the sequence of LOWs and HIGHs is statistically uncorrelated. (Especially this means that there is no period which, of course, is not true for simple digital noise sources as the one presented here.)

There exists a fairly simple way to create digital white noise using a shift register with n bits. Each clock pulse shifts the content one bit to the right and while the rightmost bit gets lost, the leftmost is filled up with an XOR combination of two other bits (a and b) from the shift register. The period and pulse distribution characteristics of the noise source are determined by which two bits are chosen.

Visit Here for more.







 

More Articles to Read

Skill Sunday: Using Top Loading SD Card Holders
Skill Sunday: Using Top Loading SD Card Holders
DECA MAX®10 FPGA Evaluation Kit
DECA MAX®10 FPGA Evaluation Kit
An Arduino laser pinball machine
An Arduino laser pinball machine
CTCSS fingerprinting: A method for transmitter identification
CTCSS fingerprinting: A method for transmitter identification
TI DLP® Pico™ Technology for Aftermarket Head-up Displays
TI DLP® Pico™ Technology for Aftermarket Head-up Displays
Brute force computation for cheap log digital potentiometer
Brute force computation for cheap log digital potentiometer
Smart "Homer"
Smart "Homer"
A DIY Segway-style vehicle
A DIY Segway-style vehicle
Superbeta transistors inside: Die photos and analysis of the LM108 op amp
Superbeta transistors inside: Die photos and analysis of the LM108 op amp
Peeqo is a desktop bot that communicates through GIFs
Peeqo is a desktop bot that communicates through GIFs

Top


Shares