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:
Aug. 22, 1978
Filed:
Aug. 23, 1977
Applicant:
Inventor:
Steven R Cook, Columbia, MD (US);
Assignee:
Digital Switch Corporation, McLean, VA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
179 / ;
Abstract
A pulse code modulation, time division multiplex conferencing system for providing to each party channel a signal indicative of the linear sum of the samples from all other party-channels, such signals are generated by accumulating the sum of all samples from all party-channels, then generating an output signal to a particular party channel by subtracting from the sum the contribution of the particular party-channel. The cumulative sum is updated upon receipt of each new sample. Provisions for conferencing channels in a plurality of sequentially aligned frames are also disclosed.