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Telephone channels and PCM analysis
The analog to digital converter (ADC) used in a telephone system outputs 8 bit words. The digital words are transmitted as a serial stream to form a PCM voice signal. The analog voice signal voltage always lies between -1.0 V and + 1.0 V.
a. Assuming that ADC is linear, what is the step size between quantization levels?
b. The PCM signal is converted back to an analog waveform. What is the quantization signal to noise ratio (SNR)?
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