General Electric Company

United States of America As Represented by the Secretary of the Air Force

Jack B Williams

Christopher E Marchant

Stephen Wanuga

Michael M Fitelson

Robert D Berlin

Richard W Heckelman

A monolithically integrated circuit is described for multiplexing parallel electrical data into a serial bit stream for transmission by fiber optics to a remote utilization apparatus and for demultiplexing a serial bit stream received from a fiber optics transmission path from a remote source. The integrated circuit uses a separate fiber for transmission and for reception, and in the transmission mode, encodes the data, which is clocked by on chip clocking into a self-clocking three-level code. The integrated circuit utilizes GaAs as the substrate material and is capable of transmitting data at bit rates in excess of 1/2 gHz.

Monolithically integrated electro-optical multiplexer/demultiplexer

The present invention relates to pipeline processors having testing means for identifying malfunctioning modules and for testing the self-testing means themselves. The testing employs the parity check principle and provides an on-line test of memory modules and an off-line test at the processor clock rate of both memory and arithmetic modules. The means for testing include a parity encoder associated with each module and a comparator which couples parity 'comparison values' to a priority encoder, operating at the high speed clock rate of the pipeline processor. The test results are then supplied to a RAM, also operating at the clock rate of the pipeline processor. With the test results in the memory, a microcomputer is provided to search the memory at a slower rate for the highest priority failed module. Means are also provided for parity checking the testing means such as the test vector generator, as well as the pipeline processor

Self-testing pipeline processors

A recursive signal processing apparatus is disclosed which utilizes the slow fluctuations in position of a signal in a recurring intensity-modulated scan for signal enhancement by effectively performing an integration along the signal's past length.

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Liverpool, NY, United States of America

Jack B Williams