Patent ID: 7301449
Filing Date: 2007-11-27
Classification: G08B,H04M

Abstract:
1. A signal detecting system using telephone lines for signal transmission, including at least one detecting device, at least one alarm device, and at least one telephone line, wherein the at least one detecting device and the at least one alarm device transmit signals, which are detected by the at least one detecting device, through the use of the at least one telephone line, each detecting device including: an RF receiver, for receiving an outer RF signal; a filter, for proceeding a filtering process on the outer RF signal; a signal amplifier, for receiving the filtered RF signal and, after amplifying and processing the RF signal, outputting the RF signal; a direct converting receiver, for receiving the amplified and processed RF signal and converting the RF signal into a baseband signal; and a level converter, for comparing the baseband signal with a predetermined level, and when the baseband signal is greater than the predetermined level, outputting the baseband signal; and each of the alarm devices including a controller and a warning device, wherein the controller and the warning device are electrically connected with each other, and when the level converter of the detecting device outputs the baseband signal, a controller of the alarm device, through telephone lines, is activated, and the warning device of the alarm device is activated at the same time as the controller.