Richard J Barron

US Patent:

6441764, Aug 27, 2002

Filed:

May 5, 2000

Appl. No.:

09/565102

Inventors:

Richard Barron - Cambridge MA
Alan V. Oppenheim - Lexington MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

H03M 112

US Classification:

341155, 375141, 37524011

Abstract:

An apparatus and method for subband signal coding, using algorithms of comparable complexity to conventional coders, that exploits a noisy analog signal at the decoder. It is assumed that the analog signal is the output of a channel through which the source is sent uncoded. By using the analog signal at the receiver, the required digital bit rate is able to be reduced while offering comparable fidelity to conventional coding systems that ignore the analog signal. Concepts from conventional subband coding, e. g. , subband decomposition, quantization, bit allocation, and lossless bitstream coding, are tailored to exploit the analog signal at the receiver such that frequency-weighted mean-squared error (MSE) is minimized. Because subband coefficients are coded, all results pertaining to perceptual masking are easily applied to this method of coding. The invention is directed to a signal coding solution for a hybrid channel that is the composition of two channels: a noisy analog channel through which a signal source is sent unprocessed and a secondary rate-constrained digital channel.

US Patent:

20030033611, Feb 13, 2003

Filed:

Aug 9, 2001

Appl. No.:

09/925615

Inventors:

Jerome Shapiro - Belmont MA, US
Brian Chen - Boston MA, US
Richard Barron - Cambridge MA, US

International Classification:

H04N007/173
H04N007/16
H04N007/00
H04N011/00

US Classification:

725/136000, 348/460000, 348/461000, 348/468000, 725/111000

Abstract:

A method and apparatus for information embedding modulation and information extraction demodulation are presented which use analysis and/or synthesis filter banks. Spectral control of the form of the composite signals arising from the embedding of digital embedded information signals into digital host signals is provided. Various implementations, including cable head-end and user-end systems using such modulators are presented. One aspect of the modulator allows for reduced noise spillover into adjacent communication channels in a multi-channel communication system. In some implementations the analysis and the synthesis filter banks form perfect reconstruction filter sets. In other implementations, block transforms are used as the filter banks.

US Patent:

20170093687, Mar 30, 2017

Filed:

Sep 30, 2015

Appl. No.:

14/871700

Inventors:

- McLean VA, US
Richard J. BARRON - Waltham MA, US

Assignee:

The MITRE Corporation - McLean VA

International Classification:

H04L 12/733

Abstract:

A method for routing data packets in a network comprising, at a first node of the network, establishing communication with a plurality of neighbor nodes in the network, determining a destination node for a data packet, determining a path for routing the data packet from the first node to the destination node, wherein the path comprises one or more relay nodes for relaying the data packet from the first node to the destination node, the one or more relay nodes comprising a first neighbor node of the plurality of neighbor nodes for receiving the data packet from the first node, identifying among the one or more relay nodes and the destination node a second neighbor node of the plurality of neighbor nodes, and in accordance with the identification of the second neighbor node, transmitting the data packet to the second neighbor node.