Browse Prior Art Database

Delta Code

IP.com Disclosure Number: IPCOM000073709D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Schindler, HR: AUTHOR

Abstract

This is delta modulation encoder having a comparator digitzier 13-21 for providing signal indication 20 for each analog signal sample magnitude 10 exceeding the sum of successive differences between prior analog signal sample magnitudes and a reference. The digitizer provides yet another signal indication 21 for each magnitude equal to or less than the sum. A feedback path 2, 3 is responsive to successive comparator digitizer signal indications 20, 21 for forming an input 31, consisting of the digitizer output signal difference with respect to a constant reference summed through an integrator 30. The feedback path 2, 3 includes circuits 34, 35, 37 for exponentially and cyclically varying the reference level at a first time rate of change.

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Delta Code

This is delta modulation encoder having a comparator digitzier 13-21 for providing signal indication 20 for each analog signal sample magnitude 10 exceeding the sum of successive differences between prior analog signal sample magnitudes and a reference. The digitizer provides yet another signal indication 21 for each magnitude equal to or less than the sum. A feedback path 2, 3 is responsive to successive comparator digitizer signal indications 20, 21 for forming an input 31, consisting of the digitizer output signal difference with respect to a constant reference summed through an integrator 30. The feedback path 2, 3 includes circuits 34, 35, 37 for exponentially and cyclically varying the reference level at a first time rate of change. Other circuits 32, 33, 34, and 37 responsive to a succession of identical digitizer signal indications exponentially vary the reference level at a second time rate of change. This variation occurs for the duration of the succession of identical digitizer signal indications.

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