HC-55564 (cvsd) equivalent, continuously variable slope delta-modulator (cvsd).
* All Digital
* Requires Few External Parts
* Low Power Drain: 1.5mW Typical From Single 4.5V To 6V Supply
* Time Constants Determined by Clock Frequency;.
* Voice Transmission Over Data Channels (Modems)
* Voice/Data Multiplexing (Pair Gain)
* Voice Encryption/Sc.
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