Multiplex communications – Wide area network – Packet switching
Patent
1979-02-23
1981-02-10
Heyman, John S.
Multiplex communications
Wide area network
Packet switching
328140, 328167, 370 69, H03K 906, H03B 104
Patent
active
042504538
ABSTRACT:
A narrow band level detector for use in the frequency generating equipment of an FDM-system is described. The detector includes a product modulator one input of which receives a sine wave signal, the other input receiving an incoming signal containing the periodic signal which should be detected together with disturbing periodic signals. The sine wave signal has a determined amplitude and frequency and can be generated by an oscillator or by a phase locked loop. The output of the modulator is connected to a bandpass filter whose pass band substantially coincides with the sideband defined by the frequencies of the disturbing periodic signals. A first peak rectifier is via an amplifier connected to the output of the bandpass filter and a second peak rectifier is connected directly to the input of the detector to form a signal whose level corresponds to the maximum value of the signal from the amplifier and the detector input signal, respectively. These two signals are subtracted from each other in a subsequent adding circuit whose output signal level forms a value of the desired signal level.
REFERENCES:
patent: 3636446 (1972-01-01), Genter et al.
patent: 3659116 (1972-04-01), Sellers et al.
patent: 3750033 (1973-07-01), Fukata
patent: 3757236 (1973-09-01), Langan
patent: 3912916 (1975-10-01), Grun et al.
Heyman John S.
Telefonaktiebolaget L M Ericsson
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