Dictaphone Corporation.

Comtech Ef Data Corporation

Nms Communications Corporation

Kevin J Bruemmer

Charles C Linton

R Brough Turner

Aram Falsafi

James M Van Donsel

Andrei E Toma

Daniel F Daly

Michael R Matatia

Svetlana O Sokolova

Pascal Chamberland

Murtaza Amiji

Benoit Delorme

Paul Trudel

David Ouellet

Jean-Hugues Deschenes

Charles C Alleyne

A remote satellite modem, in conjunction with a mediation device configuration propagates frames over a cellular backhaul link so as to preserve PRC traceability by receiving a frame based signal, in which the frame based signal conforms to a hub timing signal operable to demarcate frames in the frame based signal, and identifies a start of frame in the received frame based signal, such that the start of frame is independent of the symbol timing of the hub timing signal. In response to the start of frame, the modem generates a timing packet corresponding to a remote timing signal, and forwards the timing packet and the frame based signal, in which the timing packet is for decoding the frame based signal corresponding to the hub timing signal using the remote timing signal.

Timing recovery scheme for satellite backhaul link

Wireless network demands continually increase as wireless service providers pursue additional service capabilities. In a cellular communication system, leased lines between remote cell sites and the corresponding Mobile Switching Offices (MSOs) remain a major operating cost. Bandwidth reduction by identification and elimination of payload data and control information which need not be fully replicated because it can be deduced from information accessible or previously transmitted allows fewer lines to support the same bandwidth. A wireless access gateway is operable to aggregate such redundant and regenerable data on a backhaul link between a wireless cell site and the corresponding mobile switching office (MSO) to provide low-latency, type specific lossless bandwidth reduction. The wireless access gateway identifies regenerable information and eliminates portions of the data which the device need not transmit because the data is redundant, or accessible or recreatable, at the receiving side. In this manner, the access device allows fewer lines to carry the reduced message traffic by transmitting only the non-recreatable data and eliminating message traffic for regenerable information.

Methods and apparatus for network signal aggregation and bandwidth reduction

For speech signals that represent a wave form and include a sequence of samples, a method is provided for modifying the time scale of the speech signals. The method includes estimating the number of the samples that constitutes a pitch period. The estimate is made by a plurality of pitch estimators that operate in parallel and process peak and/or valley measurements of the wave form. The method also includes combining a first group of samples with a second group of samples to form a combined group. Each group consists of the same number of sequential samples from the sequence of samples. The number of samples in each group is equal to the estimated number of samples that constitutes a pitch period. The second group of samples immediately follows the first group in the sequence of samples. According to another feature of the invention, the method includes determininq whether the time scale of the speech signals is to be compressed or expanded. If the time scale is to be compressed a combined group is periodically reproduced instead of the first and second groups. If the time scale is to be expanded, a combined group is periodically reproduced after reproducing the first group and before reproducing the second group.

Time scale modification of speech signals

Growing community of inventors

Southington, CT, United States of America

Kevin J Bruemmer