Title :
A continuously variable slope adaptive delta modulation codec system
Author :
Gregorian, Roubik ; Gord, John G.
Abstract :
The author describes a CMOS single-chip monolithic adaptive delta modulation coder/decoder (codec). The codec uses a 56 kHz sample rate and is implemented with novel switched-capacitor circuits. The simplicity and efficiency of the encoding/decoding scheme allows the inclusion of several other functions on the chip, including a dual-tone multifrequency generator and and an 8-step programmable attenuator. These features make it especially suitable for private automatic branch exchange (PABX) applications. Experimental results are presented that show the circuit meets the necessary systems requirement for all usual applications.
Keywords :
Codecs; Delta modulation; Digital integrated circuits; Field effect integrated circuits; Linear integrated circuits; Private telephone exchanges; Switched capacitor networks; Telephone equipment; codecs; delta modulation; digital integrated circuits; field effect integrated circuits; linear integrated circuits; private telephone exchanges; switched capacitor networks; telephone equipment; Attenuators; Codecs; Decoding; Delta modulation; Encoding; Headphones; Phase change materials; Pulse modulation; Switched capacitor circuits; Switching circuits;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.1983.1052019
