CSCE 3612 ch6-5

CSCE 3612 ch6-5 - Processes and operating systems Telephone...

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© 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. Processes and operating systems Telephone answering machine.
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© 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. Theory of operation Compress audio using  adaptive  differential pulse code modulation   ( ADPCM ). time time analog ADPCM 3 2 1 -1 -2 -3
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© 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. ADPCM coding Coded in a small alphabet with positive  and negative values. {-3,-2,-1,1,2,3} Minimize error between predicted value  and actual signal value.
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© 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. ADPCM compression system quantizer integrator inverse quantizer Σ encoder inverse quantizer integrator decoder samples
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© 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. Telephone system terms Subscriber line : line to phone. Central office : telephone switching  system. Off-hook : phone active. On-hook : phone inactive.
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© 2008 Wayne Wolf Overheads for Computers as Components Real and simulated subscriber line Real subscriber line: 90V RMS ringing signal;
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CSCE 3612 ch6-5 - Processes and operating systems Telephone...

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