Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1989-11-16
1993-07-20
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
455 10, 455266, H04B 110
Patent
active
052300986
ABSTRACT:
A relay receiver performs a heterodyne relay operation by using a receiving frequency converting portion, an intermediate frequency amplifying portion and an automatic gain controller. The variable band limiting portion limits an amplified signal output from the intermediate frequency amplifying portion to a band corresponding to the state of a band control signal, thereby transmitting an amplified signal. The band control portion is responsive to an automatic gain control signal outputted from the automatic gain controller, and outputs to the variable band limiting portion a band control signal for enabling the variable band limiting portion to limit the amplified signal to a narrow band in accordance with a decrease in the arriving level of the high frequency band received signal. Therefore, the frequency band of a communication signal amplified by the intermediate frequency amplifying portion is narrowed only when the arriving level of a received signal is low.
REFERENCES:
patent: 3035169 (1962-05-01), Griffith
patent: 3872387 (1975-03-01), Banach
patent: 3931576 (1976-01-01), Csicsatka et al.
patent: 4677687 (1987-06-01), Matsuo
patent: 4989264 (1991-01-01), Ohto
Reghinot, J. C., "Hyperfrequences et faisceaux hertziens", Toute L'Electronique, No. 500, Jan. 1985, pp. 50-55.
Patent Abstracts of Japan, vol. 6, No. 147 (E-123) Aug. 6, 1982 for JP-A-57-068-934 (Fujitsu) Apr. 27, 1982.
Patent Abstracts of Japan, vol. 8, No. 84 (E-239) [1521] Apr. 18, 1984 for JP-A-59 5714 (Matsushita) Jan. 12, 1984.
Patent Abstracts of Japan, vol. 10, No. 329 (E-452) [2385], Nov. 8, 1986 for JP-A-61-135-214 (NEC) Jun. 23, 1986.
Eisenzopf Reinhard J.
Fujitsu Limited
Urban Edward
LandOfFree
Relay receiver having a variable bandwidth does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Relay receiver having a variable bandwidth, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Relay receiver having a variable bandwidth will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1767785