Introduction
This article investigates intrinsic noise, specifically ‘Pink Noise’ in (AVS) Audio Visual Systems. Intrinsic noise emerges from within an electronic circuit and creates a less than optimal response from the circuit to external inputs.
Pink Noise
When examining a system, the noise floor is the base level of its intrinsic noise. Anything that is identified as below the noise floor is classed as ‘buried in the noise.’ This would cover mostly white or broadband noise and when looking at the frequency domain, would be the flat part of the circuit’s intrinsic noise spectrum.
Pink noise, however, (also referred to as flicker, 1/ noise) rises out of the white noise and transpires below a certain value known as the ‘corner frequency’. Moreover, in lower operating frequencies, pink noise is more intense.
“White noise is defined as sound with equal power per Hz in frequency, pink noise is filtered to give equal power per octave or equal power per 1/3 octave. Since the number of Hz in each successive octave increases by two, this means the power of pink noise per Hz of bandwidth decreases by a factor of two or 3 decibels per octave.”
Pink noise materializes under conditions where the current is flowing. It’s the exhibition of charge carriers being captured arid released randomly.
- Bipolar transistors = due to contamination and imperfect surface conditions at the base-emitter junction.
- CMOS devices = associated with extra electron energy states at the boundary between silicon and silicon dioxide
Conclusion
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