Telecommunications – Receiver or analog modulated signal frequency converter – Measuring or testing of receiver
Patent
1997-05-07
2000-01-04
Vo, Nguyen
Telecommunications
Receiver or analog modulated signal frequency converter
Measuring or testing of receiver
455 671, 455423, H04B 1700
Patent
active
060119624
ABSTRACT:
A circuit for testing the function of mobile radio receiving installations is provided, wherein the circuit generates an HF-output signal that is used to test the system. A frequency mixer receives an oscillation signal (8) generated from within the superheterodyne receiver and an IF-carrier oscillation signal (32) generated from and oscillator (7) within the circuit. The frequency mixer generates an HF-output signal (12) that is dependent on the amplitude and frequency of the received oscillation signals. In alternative embodiments of the invention, the circuit of the invention is incorporated into the superheterodyne receiver, and the generated IF-carrier frequency 32 is eliminated and replaced with an IF-signal 22 produced by self-excitation of the superheterodyne receiver. With multi-antenna scanning diversity systems, additional switches and switching signals are included.
REFERENCES:
patent: 4188579 (1980-02-01), Yoshisato
patent: 4225969 (1980-09-01), Hong
patent: 4361904 (1982-11-01), Matsumura
patent: 4776032 (1988-10-01), Odate et al.
patent: 4984293 (1991-01-01), Cummings et al.
patent: 5015973 (1991-05-01), Kawakami et al.
patent: 5109535 (1992-04-01), Kume et al.
patent: 5625889 (1997-04-01), Chikkaswamy et al.
Hopf Jochen
Lindenmeier Heinz
Reiter Leopold
FUBA Automotive GmbH
Nguyen Duc
Vo Nguyen
LandOfFree
Circuit for testing the function of mobile receiving installatio does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Circuit for testing the function of mobile receiving installatio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit for testing the function of mobile receiving installatio will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1079727