Title:
RECEIVED SIGNAL ATTENUATION CONTROLLER
Document Type and Number:
Japanese Patent JP2778546
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a received signal attenuation controller capable of reducing the attenuation of a received signal so as to prevent the attenuation due to thermal noise when the signal level of the received signal is small.
SOLUTION: A reception field intensity detection circuit 4 detects the signal level of an amplified received signal, that is, a field intensity value. When the detected field intensity value is threshold or below, a control circuit 5 outputs voltage value of zero to an attenuation circuit 2. When the value is the threshold or above the field intensity value detected in a reception field intensity detection circuit 4 is outputted to the attenuation circuit 2 as it is. Then attenuation circuit 2 changes attenuation in accordance with the output voltage value from the control circuit 5 to attenuate the received signal.
Inventors:
OKAMURA HIDETOSHI
Application Number:
JP21554895A
Publication Date:
July 23, 1998
Filing Date:
August 24, 1995
Export Citation:
Assignee:
NIPPON DENKI KK
International Classes:
H04B1/26; H03G3/30; H04B1/10; (IPC1-7): H04B1/26; H04B1/10
Domestic Patent References:
| JP5690011U |
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)
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