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:
Jul. 07, 1981
Filed:
Oct. 16, 1978
Ronald J Surprenant, Anaheim, CA (US);
Lear Siegler, Inc., Santa Monica, CA (US);
Abstract
An automatic gain repeater for varying the amplification of AC signals transmitted through a telephone subscriber loop in accordance with the impedance of such subscriber loop is described. The automatic gain control circuitry includes controllable variable gain amplifiers connected in series circuit arrangement with the subscriber loop. The gain of the amplifiers is varied, in a continuous manner, in accordance with the subscriber loop line impedance such that the overall transmission line loss is a constant predetermined value. Gain of the amplifiers is accomplished by means of a control signal generated in a loop extender circuit that is coupled to the subscriber loop. Impedance networks coupled to gain repeater hybrid transformers provide minimum operating power loss with maximum power transfer between the automatic gain repeater circuit and subscriber loop while maintaining adequate transhybrid loss between the two directions of transmission and matching input impedance.