analog-to-digital conversion and digital-to-analog conversion (with dsp)
DESCRIPTION
Analog-to-digital Conversion and Digital-to-analog Conversion (with DSP). ES-3. 8R. V 1. V OUT. 4R. V 2. 2R. V 4. R. V 8. 8R. A very simple (…too simple!) Digital-to-analog converter. A simple Analog-to-digital converter. Analog Input. +. -. scitec.uwichill.edu.bb. - PowerPoint PPT PresentationTRANSCRIPT
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Analog-to-digital ConversionandDigital-to-analog Conversion(with DSP)ES-3
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A very simple (too simple!)Digital-to-analog converter
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A simpleAnalog-to-digital converterscitec.uwichill.edu.bb Analog Input+-
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scitec.uwichill.edu.bb Analog InputA simpleAnalog-to-digital converter+-3.5v0v0 0 0 0 0 0 0 0high0 0 0 0 0 0 0 11v0 0 0 0 0 0 1 02v0 0 0 0 0 0 1 13v0 0 0 0 0 1 0 04vlow0 0 0 0 0 0 1 13v0 0 0 0 0 1 0 0Improve accuracy: scale the DAC
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Nyquist Sampling RateThe sampling of data must be at least twice the rate as the maximum frequency of the analog signal: fs>2fmaxV(t)Time, tUse a low pass filter with fc = fmax to remove harmonics sine
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Nyquist Sampling RateThe sampling of data must be at least twice the rate as the maximum frequency of the analog signal : fs>2fmaxV(t)Time, t
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Digital Signal Processing
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Running average of 10 pts
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Digital FilteringRemoving Noise and Interference from a Digital Signal
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FFT of a noisy sine wave and its digitally filtered signal
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DSP Example
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Simple Notch Filterto remove 60 Hz interferencet (s)Vin(n)fS = 1440 samples per second1/60 s60 Hz sineVout(n) = Vin(n) + Vin(n - fs / 2fnotch) = Vin(n)+Vin(n-12)This adds the sample that is 1800 out of phase at 60 Hz
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Matlab demoes3_60Hz.m
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