Antenna alarm detection system
First Claim
1. An antenna alarm detection system comprising:
- first and second antennas;
transmission means for transmitting a control signal and speech communication information;
switching means for alternately switching and outputting the control signal transmitted from said transmission means to said first and second antennas in a predetermined cycle in a non-speech communication state in which only the control signal is transmitted;
detection means for detecting reflected power of each of transmission signals from said first and second antennas; and
alarm output means for comparing the detected reflected power with a predetermined reference value, and outputting an alarm signal on the basis of the comparison result.
1 Assignment
0 Petitions
Accused Products
Abstract
An antenna alarm detection system includes first and second antennas, a transmission section, an antenna switch section, a reflected power detection section, and a comparing section. The transmission section transmits a control signal and speech communication information. The antenna switch section alternately switches and outputs the control signal transmitted from the transmission section to the first and second antennas in a predetermined cycle in a non-speech communication state in which only the control signal is transmitted. The reflected power detection section detects the reflected power of each of transmission signals from the first and second antennas. The comparing section compares the detected reflected power with a predetermined reference value, and outputs an alarm signal on the basis of the comparison result.
18 Citations
9 Claims
-
1. An antenna alarm detection system comprising:
-
first and second antennas; transmission means for transmitting a control signal and speech communication information; switching means for alternately switching and outputting the control signal transmitted from said transmission means to said first and second antennas in a predetermined cycle in a non-speech communication state in which only the control signal is transmitted; detection means for detecting reflected power of each of transmission signals from said first and second antennas; and alarm output means for comparing the detected reflected power with a predetermined reference value, and outputting an alarm signal on the basis of the comparison result. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. An antenna alarm detection system comprising:
-
first and second antennas; transmission means for transmitting a control signal and speech communication information; switching means for alternately switching and outputting the control signal transmitted from said transmission means to said first and second antennas in a predetermined cycle in a non-speech communication state in which only the control signal is transmitted; detection means for detecting reflected power of each of transmission signals from said first and second antennas; alarm output means for comparing the detected reflected power with a predetermined reference value, and outputting an alarm signal when the detected reflected power is larger than the predetermined reference value; and first and second reception means for receiving reception signals output from said first and second antennas; and coupling means for outputting a transmission signal from said transmission means through a bidirectional signal line, and outputting reflected signals of transmission signal sent from said first and second antennas through said bidirectional signal line to said detection means; and control means for, in a speech communication state in which speech communication information is transmitted/received, comparing a received field intensity of a reception signal input through said first antenna with a reflected field intensity of a reception signal input through said second antenna, and controlling said switching means to switch said transmission means to one of said first and second antennas which exhibits a higher received field intensity; wherein said transmission means transmits speech communication information one of said first and second antennas to which said transmission means is switched; and wherein said switching means connects said coupling means to one of said first and second antennas through said bidirectional signal line. - View Dependent Claims (8, 9)
-
Specification