Telecommunications – Receiver or analog modulated signal frequency converter – Measuring or testing of receiver
Patent
1994-08-29
1996-04-09
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Measuring or testing of receiver
4552264, 4552491, 455308, H04B 116, H04B 1700
Patent
active
055070221
ABSTRACT:
An electric field level detecting apparatus includes an intermediate-frequency signal generator, an intermediate-frequency amplifier, an analog voltage generator, an analog/digital converter, N converting tables, and a control circuit. The variable attenuator receives an intermediate-frequency signal from the intermediate-frequency signal generator as an input and changes a passing attenuation value in accordance with an attenuation value set to be changed at N steps (N: arbitrary natural number) by a first control signal. Each of the N converting tables prestores a relationship between a digital voltage and an electric field strength of a radio frequency reception signal corresponding to the attenuation value set in the variable attenuator and converts the digital voltage from the analog/digital converter into an electric field level signal indicating a corresponding electric field strength to output the electric field level signal. The control circuit outputs the first control signal for setting the attenuation value of the variable attenuator to be changed at N steps on the basis of the digital voltage from the analog/digital converter to select one of the converting tables in accordance with the attenuation value set in the variable attenuator.
REFERENCES:
patent: 5163163 (1992-11-01), Sato
patent: 5351271 (1994-09-01), Coquerel
patent: 5390365 (1995-02-01), Enoki et al.
Eisenzopf Reinhard J.
NEC Corporation
Pham Chi H.
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