3com Corporation

Darrin J Gibbs

Todor Cooklev

Kenneth S Morley

Mark L Gray

Jeffrey L Jones

Ryan A Kunz

Gary H Stout

John Marshall

Ken Morley

A communication system embodying the invention has a communication channel with at least two ends, one end of the channel being connected to a transmission device with relatively limited computational capacity and an other end of the channel being connected to a computer having relatively large computational capacity. The transmission device includes a signal source node; a set of M&minus;1 delay buffers connected in series and defining a set of M progressively delayed signal nodes, M being a positive integer, one end of the series of M delay buffers being connected to the signal source node; a set of M parallel downsampling operators connected to the M progressively delayed signal nodes; and, a parallel-to-serial converter having M parallel inputs and a single serial output, the M parallel inputs being connected to the outputs of the M parallel downsampling operators and the single serial output being coupled to the one end of the communication channel. A set of M parallel filter coefficient multipliers having respective inputs and outputs and corresponding to the respective coefficients H (z ) of an anti-aliasing filter H(z)&equals;&Sgr; z H (z ) is implemented in the computer to minimize the computational requirements for the transmission device to simple tasks.

Video signal processing method and apparatus for internet appliances or embedded systems

A method and system for performing speech recognition for an internet appliance using a remotely located speech recognition application. The invention includes an internet appliance that is connected through a network with either a stand-alone computer or a server computer located at the Internet Service Provider. Verbal commands directed to an internet appliance are received as analog signals and converted to digital signals. The digital signals are remotely translated into a set of instructions by a dedicated hardware device or a software program that operates a speech recognition application at either a stand-alone computer or server computer located at an Internet Service Provider in a form recognizable by the internet appliance. The internet appliance receives and executes the translated instructions.

Method and system for performing speech recognition for an internet appliance using a remotely located speech recognition application

Continuously variable slope delta modulation coding uses a thresholder having an analog input and a digital output representing the relationship between a signal amplitude at the analog input and a predetermined threshold. An integrator has an output and one input connected to the output of the thresholder and a second input that receives a step size value, the output of the integrator corresponding to a product of the thresholder output and the step size value. An adder has one input that receives an analog input signal that is to be encoded and a second input connected to the output of the integrator. The output of the adder is coupled to the analog input of the thresholder. A step size controller is responsive to an analog signal level related to the analog input signal for varying the step size value in response to variations in the analog signal level.

Method and apparatus for continuously variable slope delta modulation coding of signals

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South Jordan, UT, United States of America

Darrin J Gibbs