<p>An audiofrequency signal is applied to a power amplifier having an output impedance of considerably less than an ohm that is coupled through a network comprising at least a capacitor that presents a low impedance to this audiofrequency signal and much higher impedance to energy at the 60 Hz power frequency to a power line to provide an amplified signal that is transmitted to a receiver separated from the transmitter by at least one distribution transformer and having a high pass filter for rejecting the 60 Hz power frequency and a number of harmonics thereof while transmitting the audiofrequency signal. The system is especially advantageous for using ordinary power lines for transmitting information in connection with automatic meter reading.</p>
申请公布号
CA1022081(A)
申请公布日期
1977.12.06
申请号
CA19740210509
申请日期
1974.10.01
申请人
AMERICAN SCIENCE AND ENGINEERING, INC.
发明人
JAGODA, NEIL H.;KUBIERSCHKY, KLAUS;BAKER, HOWARD S.