3com Corporation

Harris Corporation

Hbc Solutions, Inc.

John Crawford LeVieux

Bruce L Trumbo

Rashad Barghouti

Farokh Parchekani

John Jay Kaufman

Arndt Mueller

Theodore Basil Staros

Larry Alan Stanton

Electronic component resource utilization for certain digital filters may be significantly reduced by using a method for determining a set of coefficient words using a smaller word size. The disclosed method and/or apparatus may be used to determine an initial set of coefficient words for a digital filter for a predetermined frequency, a predetermined quality factor ('Q'), and a predetermined sampling frequency, and determining a gain error value for the digital filter for the set of coefficient words. If the determined gain error value is greater than a predetermined threshold, the quality factor may be modified by multiple predetermined amounts. The set of coefficient words may be redetermined using the modified quality factors as often as necessary until the gain error drops below the predetermined threshold.

Method for reducing digital filter coefficient word size and apparatus therefor

The present disclosure provides a method and system for combining multiple coefficient words using only the magnitude bits of each of the coefficient words and using the sign bits of each of the coefficient words to modify the output of the combined magnitude bits. Using this method and/or system, it is possible to implement, for example, digital filters using larger coefficient word sizes without having to incur the inefficiencies and cost associated with using additional hardware resources, while maintaining an acceptable gain error in the filter response.

Method for combining binary numbers in environments having limited bit widths and apparatus therefor

In a phase-locked loop, multiple input clock references can each connect to a different interface card. Each interface card can include a phase comparator portion of a phase-locked loop. The phase comparators can produce a phase error signal for a phase-locked loop. One or more of the phase error signals can be transmitted across a bus, such as a time division multiplexed bus, to a system card. The system card can include a controlled oscillator portion of the phase-locked loop. The output of the system card can then sent back to one or more of the interface cards to complete the phase-locked loop.

System and method for partitioning a system timing reference among multiple circuit boards

A system and method for managing resources in a distributed xDSL modem pool arrangement including a first number of front-end modules and a second number of back-end modules. In a preferred embodiment, when a back-end module identifies that its associated call session has entered idle-mode, idle-mode processing is performed in a manner which reduces processing load and electrical power consumption but does not result in a loss of synchronization or require retraining. A repetitively transmitted single modulated symbol transmitted from a user terminal device coupled to the modem pool indicates idle periods in user data. In the preferred embodiment, the modulated symbol to be transmitted is selected such that its spectral properties match those of user data modulated symbols.

Distributed XDSL modem pool with front-end idle mode processing

A system and method for managing resources in a distributed Voice-over-IP (VoIP) speech coder pool arrangement including multiple speech coders each comprised of a first number of front-end modules and a second number of back-end modules. Each call session has assigned thereto a front-end module and a back-end module cooperatively functioning as a speech coder. In a preferred embodiment, voice samples are passed through the assigned front-end module to the back-end module where they are encoded and placed as speech frames on the IP network. As soon as absence of speech is detected by a Voice Activity Detector (which may or may not be shared by multiple front-end modules), processing is handed over to the front-end module freeing up the back-end module to sit idle resulting in reduced power consumption. In alternate embodiment, the freed-up back-end module is reassigned to a new VoIP call session for maximum resource utilization.

Growing community of inventors

Carlsbad, CA, United States of America

John Crawford LeVieux