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:
Feb. 01, 1977
Filed:
Jul. 18, 1975
James Charles Candy, Convent Station, NJ (US);
Stanley Leon Freeny, Middletown, NJ (US);
William Herbert Ninke, Holmdel, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
Digital character signals are split into at least two bit groups of different binary significance. The first and most significant of the bit groups is registered and periodically sampled for conversion in a resistor network to an analog format. The bits of the second, or least significant, bit group are utilized to produce a signal train including in a character time a number of pulses determined by the value of the second bit group and which pulses are approximately evenly located in the interval of the character. Each pulse of the train, as it occurs, momentarily augments the most significant bit group. One embodiment is shown in which the signal train produced is successive overflow carries from a high speed accumulation operation initially utilizing the least significant bit group and a starting character and thereafter using the least significant bit group and the immediately preceding accumulation sum. In another embodiment the signal train is produced by a binary rate multiplier, and the least significant bit group is employed to select one of the plural multiplier output frequencies. Embodiments utilizing time compression are also shown.