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:
Sep. 14, 1993
Filed:
Feb. 14, 1992
Chun Loo, Ontario, CA;
Masahiro Umehira, Yokohama, JP;
Abstract
A group demodulator for FDMA/PSK input signals comprising a down-converter for the input signals to convert these signals into in-phase and quadrature-related signals which are applied through analog-to-digital converters to a digital transmultiplexer. The digital transmultiplexer converts the signals into a number of channels of PSK modulated data. The output of each analog-to-digital converter is applied to an automatic threshold controller which detects the statistical bias of the input signal amplitude. Each automatic threshold controller provides an analog reference signal which is applied to a reference input of the associated analog-to-digital converter. The reference signal corrects any DC offset error for the analog-to-digital converter and prevents degradation in energy per bit-to-noise density ratio.