Paul N Alexander

US Patent:

6487294, Nov 26, 2002

Filed:

Mar 9, 1999

Appl. No.:

09/264867

Inventors:

Paul F. Alexander - Potomac MD 20854

International Classification:

H04K 100

US Classification:

380270, 380 30, 713168

Abstract:

A secure satellite communications system for mobile users. The secure satellite communications system includes an orbiting communications satellite which performs the function of relaying communications to and from a plurality of earth stations. The secure satellite communications system provides a public key system for satellite communications systems to establish private communications. Communications messages are sent by a transmitting earth station encrypted by a public encryption procedure for a particular receiving earth station. The public encryption procedures are broadcast along with other system status and operational information on a common signaling broadcast channel. The receiving earth station utilizes a private decryption procedure to decrypt the received communications messages. The receiving earth station also validates the transmitted communications messages received by the receiving earth station by utilizing a cyclic redundancy check on the received communications messages.

US Patent:

6529547, Mar 4, 2003

Filed:

Sep 20, 1999

Appl. No.:

09/214065

Inventors:

Paul Francis Alexander - Potomac MD
David John - Buckinghamshire, GB

Assignee:

International Mobile Satellite Organization - London

International Classification:

H04Q 120

US Classification:

375224, 375219, 375220, 340605, 340620

Abstract:

Digital audio recording equipment is used to record modulated signals, such as the RF test signals generated by test modems. If the modulated signals are outside the audio frequency range, they are down-converted into the audio frequency range using a mixer, local oscillator and a filter. The digitally converted data are recorded onto a suitable medium, such as a DAT, CD or a computer memory. The data is then disseminated for reproduction by a suitable digital audio player. The reproduced audio signal may be up-converted to the desired radio frequency using a mixer, local oscillator and a filter. The reproduced signal may be used to test demodulators, codecs or transceivers. The signals output by the transceiver and the reproduced signal may be recorded on different channels of the digital audio recording equipment. The recording equipment may be used to capture RF signals for later analysis. The player may be used for reproducing modulated signals for broadcast.

US Patent:

20030012306, Jan 16, 2003

Filed:

Sep 17, 2002

Appl. No.:

10/244427

Inventors:

Paul Alexander - Potomac MD, US
David John - Buckinghamshire, GB

Assignee:

International Mobile Satellite Organization - London

International Classification:

H03K009/00

US Classification:

375/316000

Abstract:

Digital audio recording equipment () is used to record modulated signals, such as the RF test signals generated by test modems. If the modulated signals are outside the audio frequency range, they are down-converted into the audio frequency range using a mixer (), local oscillator () and a filter (). The digitally converted data are recorded onto a suitable medium, such as a DAT, CD or a computer memory. The data is then disseminated for reproduction by a suitable digital audio player (′). The reproduced audio signal may be up-converted to the desired radio frequency using a mixer (), local oscillator () and a filter (). The reproduced signal may be used to test demodulators, codecs or tranceivers. The signals output by the transceiver and the reproduced signal may be recorded on different channels of the digital audio recording equipment (). The recording equipment () may be used to capture RF signals for later analysis. The player (′) may be used for reproducing modulated signals for broadcast.

US Patent:

20180115626, Apr 26, 2018

Filed:

Oct 20, 2017

Appl. No.:

15/789471

Inventors:

- Acton MA, US
Piotr GALECKI - Lexington MA, US
Thuy FERNANDES - Acton MA, US
Paul ALEXANDER - Lexington MA, US
John SIEVERS - Lynnfield MA, US

International Classification:

H04L 29/08

Abstract:

Systems and methods are described herein for adaptively transcoding media in a communications network such that computer processing resources are effectively utilized to deal with varying traffic patterns in the communications network. A computing device receives a request to transcode content and determines a first amount of tokens based on a number of CPU cores associated with the computing device, and a currently used amount of tokens. The computing device determines a second amount of tokens associated with transcoding the content and when the first amount of tokens is less than the second amount of tokens, the computing device bypasses transcoding for the content or adjusts a transcoding parameter to reduce a number of tokens associated with transcoding the content.

US Patent:

20170359601, Dec 14, 2017

Filed:

Jun 9, 2017

Appl. No.:

15/618719

Inventors:

- Acton MA, US
Paul ALEXANDER - Lexington MA, US
Srinivasan VENKATRAMAN - Belmont MA, US

International Classification:

H04N 21/2343
H04N 21/4385
H04N 21/43
H04N 9/804
H04N 21/4402

Abstract:

Systems and methods of transcoding video sequences for delivery in a mobile network. A source video sequence including source video frames is received and a source video frame type associated with each of the source video frames is determined based on a differential between a composition time stamp (CTS) and a decoding time stamp (DTS) associated with each of the source video frames. A frame type ratio value for the target frame-types is calculated based on a longest mini-GOP length. A target frame size of each target video frame is determined based on the frame type ratio value and a target transcoding rate, and each of the target video frames in a target video track is encoded to the target frame size to form a target video sequence.