The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 11, 1976
Filed:
Apr. 18, 1975
Joseph Henry Condon, Summit, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
An analog input signal to a delta modulation coder is differentiated prior to being combined in an integrator with the output of a precise first negative feedback circuit to produce an error signal. An amplified and integrated form of the error signal is combined in a resistive-capacitive crossover circuit with the output of a fast, but coarsely integrating, negative feedback circuit to overcome delay in the response of the first-mentioned, i.e., slow, feedback circuit. The crossover circuit output is applied to a low gain comparator having a ground reference and used to drive a first clocked threshold circuit for producing a digital signal representation. A Q output of the latter circuit drives the fast feedback path; and a Q output controls a further clocked threshold circuit which drives the slow feedback path, as well as providing a retimed delta modulated output signal train. A delta modulation decoder which is compatible with the described coder is also shown.