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. 11, 1978
Filed:
Sep. 28, 1977
Frank A Perkins, Melbourne, FL (US);
Harris Corporation, Cleveland, OH (US);
Abstract
Non-linearities imparted by an acoustic coupling instrument for interfacing data signals from a modem to a telephone line are compensated. Both the output of the modem and that of the non-linearity introducing instrument are monitored. The two output signals therefrom are compared and an error signal representative of the degree of non-linearity of the line signal is generated, and this error signal is then appropriately scaled and stored in a memory as a correction signal. Stored correction signals are read out of the memory in response to address signals defined by the characteristics of the signals from the modem, and are added to the modem output signals before they are imparted to the non-linear coupling instrument. The added correction signals effectively compensate for the non-linearity of the acoustic coupler, thereby removing the unwanted distortion from the telephone line signal. The contents of the memory are dynamically adjusted so that the system effectively adapts itself to the non-linearity of the instrument.