5.Digital - DigitalSignaling Digital EarlySystems...

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Digital Signaling
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Digital Early Systems Morse code, telex Digital Signal Processing Compatibility with computers Coding and post processing Nature Increased bandwidth demand Less susceptible to noise Compatible with multiple sources
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Pulse Code Modulation Pulse Amplitude Modulation Periodic pulses of fixed duration Amplitude coded Waveform http://cnyack.homestead.com/files/modulation/modpam.htm Pulse Width Modulation Periodic pulses of constant amplitude Pulse width coded Waveform http://cnyack.homestead.com/files/modulation/modpwm.htm Pulse Position Modulation Pulse timing coded Waveform http://cnyack.homestead.com/files/modulation/modppm.htm
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PAM Circuits Modulation Detection Peak detection, AM http://www.tpub.com/content/neets/14184/css/14184_175.htm  
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Analog and Digital Conversion A/D Sampling Rate Aliasing Nyquist Quantization Step size or error Binary encoding Line coding D/A
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Sampling
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Aliasing and DSP
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Nyquist Rate
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Quantization Resolution Error (Noise) (V max  - V min ) / 2 B S/N http://cnx.rice.edu/content/m0051/latest/
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Companding Finer Step for Small Signal μ -law
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A/D Circuit Ramp Successive Approximation Flash
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Delta Modulation Transmit the Difference Single Bit A/D Over Sampling
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Delta Modulation
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Sigma Delta Modulation Delta Difference Sigma Sum of previous difference http://www.numerix-dsp.com/appsnotes/APR8-sigma-delta.pdf http://www.mwrf.com/Articles/Print.cfm?ArticleID=10586
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D/A Circuit R-2R Weighted Sum
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5.Digital - DigitalSignaling Digital EarlySystems...

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