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1. (WO1992010882) SEAMLESS FREQUENCY HOPPING SYSTEM
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1992/010882 International Application No.: PCT/US1991/006347
Publication Date: 25.06.1992 International Filing Date: 05.09.1991
Chapter 2 Demand Filed: 29.06.1992
IPC:
H04B 1/713 (2011.01)
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
B
TRANSMISSION
1
Details of transmission systems, not covered by a single one of groups H04B3/-H04B13/123; Details of transmission systems not characterised by the medium used for transmission
69
Spread spectrum techniques
713
using frequency hopping
Applicants:
ALLIED-SIGNAL INC. [US/US]; Law Department (C.A. McNally) P.O. Box 2245 Morristown, NJ 07962-2245, US
Inventors:
RICHEY, Manuel, Franklin; US
HAND, Rex, Alan; US
STEPHENS, G. Byron; US
Agent:
MASSUNG, Howard, G.; Allied-Signal Inc. Law Dept. (C.A. McNally) 101 Columbia Road P.O. Box 2245 Morristown, NJ 07962-2245, US
PASCHBURG, Donald, B.; Allied-Signal Inc. 101 Columbia Road P.O. Box 2245 Morristown, NJ 07962-2245, US
Priority Data:
624,80505.12.1990US
Title (EN) SEAMLESS FREQUENCY HOPPING SYSTEM
(FR) SYSTEME A SAUTS DE FREQUENCE SANS COUPURE
Abstract:
(EN) A seamless frequency hopping system utilizes a programmable digital signal processor with interface circuitry in conjuction with a frequency hopping radio to incorporate the concepts of audio time compression, hop by hop automatic gain control and time repeating squelch to improve the sound of frequency hopped analog communication. Incoming uncompressed audio is first sliced into time segments that each correspond to one frequency hop. The uncompressed audio is then compressed to a certain percentage of its original length in time. A dead time as well as a pilot signal is added to the front of the audio. The processed audio signal is then sent to the radio where it is modulated and broadcast. A second radio receives the incoming signal and demodulates it to once again become an audio signal.
(FR) Système à sauts de fréquence sans coupure utilisant un processeur de signal numérique programmable comprenant un circuit d'interface associé à une radio à sauts de fréquence pour intégrer les concepts de compression du temps audio, la commande automatique de gain saut par saut et le dispositif de silencieux à répétition dasn le temps, afin d'améliorer le son d'une communication analogique à sauts de fréquence. On divise tout d'abord un son entrant non comprimé en plusieurs tronçons temporels qui correspondent chacun à un saut de fréquence. On comprime ensuite le son non comprimé pour qu'il ne représente plus qu'un certain pourcentage de sa longueur temporelle de départ. On ajoute un temps mort ainsi qu'un signal pilote à l'avant du son. Le signal audio traité est ensuite transmis à la radio qui le module et le diffuse. Une deuxième radio reçoit le signal d'entrée et le démodule pour qu'il redevienne un signal audio.
Designated States: AU, BB, BG, BR, CA, FI, HU, JP, KP, KR, LK, MC, MG, MW, NO, PL, RO, SD, SU
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
AU1991091237