BITS PilaniPilani Campus

EEE G529T PART 3ANC LMS SIMULINK SPEECH

COLORED NOISEVikas Kalwani

EEE DepartmentBITS Pilani, Pilani

BITS Pilani, Pilani Campus

COLORED NOISE

White noise is a uniform mixture of random energy at every frequency

Any kind of filtered noise signal can be called 'colored noise', which is just to say

that it is not a pure white noise

Pink Noise is the most common colored noise encountered

I will talk about 4 colored noises – Pink, Brown, Blue and Violet

Power Law Noise

A signal with components at all frequencies, with a power spectral density per

unit of bandwidth proportional to 1/fβ

β = 1 : Pink Noise Power density falls off at 10 dB/decade (−3 dB/octave)

β = 2 : Brown Noise Power density falls off at 20 dB/decade (−6 dB/octave)

β = -1 : Blue Noise Power density increases at 10 dB/decade (3 dB/octave)

β = -2 : Violet Noise Power density increases at 20 dB/decade (6 dB/octave)

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PINK NOISE BROWN NOISE

COLORED NOISE

Slope: -10 dB/decade

Slope: -20 dB/decade

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BLUE NOISE VIOLET NOISE

Slope: 10 dB/decade

Slope: 20 dB/decade

COLORED NOISE

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VERIFICATION OF THE SLOPE OF VIOLET NOISE USING SIMULINK

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SIMULINK MODEL

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SIMULATION(FOR VIOLET NOISE)

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CURVES

Reduction in MSE

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RESULTS AND FUTURE WORK