Nvision, Inc.

Miranda Technologies Inc.

Jeffrey S Evans

Charles S Meyer

Kevin J Shuholm

Robert W Hudelson

Donald S Lydon

A router has multiple channel inputs and multiple channel outputs and a switch core for selectively connecting at least two of the channel outputs to respective channel inputs. Each channel output is connected to an output signal path containing a FIFO register and the router is configured so that first and second channel outputs are connected to a pair of channel inputs respectively. The router configuration is changed so that the first and second channel outputs are connected to first and second channel inputs respectively. The FIFO registers in the output signal paths of the first and second channel outputs are forced to equal fullness.

Method of operating a router

A composite input signal having an audio component and a video component is routed from an input to an output by separating a stream of audio data words at an average frequency F1 from the video component and supplying the separated stream of audio data words sequentially to a FIFO input register. The output of the FIFO input register is polled at a frequency F2, greater than F1, and, in the event that an audio data word is available at the output of the FIFO input register, the audio data word is conveyed from the output of the FIFO input register to an input of a signal path. Otherwise a null data word is conveyed to the input of the signal path. The signal path thereby conveys a stream of data words that comprises both audio data words and null data words. The audio data words of the stream conveyed by the path are combined with the video component of the composite input signal.

Audio/video router

A routing switch includes a first router module having N signal input terminals, M signal output terminals, an expansion input terminal and an expansion output terminal and including a core for routing a signal received at any one of the N signal input terminals selectively to any one or more of the output terminals and for routing a signal received at the expansion input terminal selectively to any one or more of the N signal output terminals. The router further includes a second router module having N signal input terminals, M signal output terminals, an expansion input terminal and an expansion output terminal and including a core for routing a signal received at any one of the N signal input terminals selectively to any one or more of the output terminals and for routing a signal received at the expansion input terminal selectively to any one or more of the M signal output terminals. The expansion output terminal of the first router module is connected to the expansion input terminal of the second router module and the expansion output terminal of the second router module is connected to the expansion input terminal of the first router module.

Expandable router

An optoelectric converter for generating a binary electrical data signal from a binary optical data signal includes a semiconductor photodetector for receiving the optical data signal and generating an electrical current signal. An amplifier receives the current signal generated by the semiconductor photodetector and providing a voltage output signal. An equalizer receives the voltage signal generated by the amplifier and generates an equalizer output voltage signal. A DC restorer receives the equalizer output voltage signal and generates a DC restored voltage signal.

Optoelectric converter

An automatic power control circuit for a laser driver which is responsive to a data signal for driving a laser diode includes a low pass filter connected to receive the data signal and generate an output signal dependent on the DC content of the data signal. A circuit responsive to both an externally provided average power control signal and the output signal of the low pass filter controls supply of operating current to the laser diode.

Growing community of inventors

Grass Valley, CA, United States of America

Jeffrey S Evans