Hycom Incorporated

Andrew M Kameya

David M Motley

Naif D Salman

Raymond J Turner

A fast learn modem comprising a transmitter for generating a fast learn preamble and applying the preamble to a communication channel and a receiver for receiving the fast learn preamble from the communication channel. The fast learn preamble includes a single impulse and the timing, phase and equalization characteristics of the receiver are adjusted in response to the single impulse so that the receiver can receive and process data.

Single pulse fast learn modem

A phase tracking network comprising a phase correction network for correcting at least some of the phase error of an input signal to provide a phase corrected signal having components in first and second channels and a detector responsive to the phase corrected signal for providing a detected signal having first and second components in the first and second channels. An error calculator provides a phase correction signal back to the phase correction apparatus which responds to the phase correction signal to correct the phase error of the input signal. The phase error signal contains substantially no noise from the first channel at least when the first component of the detected signal is zero and contains substantially no noise from the second channel at least when the second component of the detected signal is zero. This is accomplished by utilizing the error calculator to provide a first control signal which represents a first fixed value, zero, and a second fixed value when the first component of the detected signal is ideally positive and not zero, ideally zero, and ideally negative and not zero, respectively. The error calculator similarly provides a second control signal for the second component of the detected signal.

Phase tracking network

A control system comprising a gain control circuit for adjusting the gain of an input signal to provide a gain controlled signal and an integrator for integrating the gain controlled signal to provide an output signal. A first circuit responds to a particular condition for changing the gain of the gain control circuit and a second circuit responds to that same condition for changing the output signal independently of the gain control signal to bring about a more rapid change in the output signal than could be brought about solely by changing the gain controlled signal.

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Costa Mesa, CA, United States of America

Andrew M Kameya