Transfer Characteristics
The transfer characteristics of a delta modulated system follows a signum function,as it quantizes only two levels and also one-bit at a time.
The two sources of noise in delta modulation are "slope overload", when steps are too small to track the original waveform, and "granularity", when steps are too large. But a 1971 study shows that slope overload is less objectionable compared to granularity than one might expect based solely on SNR measures.
Read more about this topic: Delta Modulation
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