H - Electricity – 03 – J
Patent
H - Electricity
03
J
325/80
H03J 7/18 (2006.01)
Patent
CA 1144989
PHF. 77-510. ABSTRACT: Command signal generator for a channel selection device in a mobile receiver for frequency or phase modula- tion which is mobile relative to fixed transmitter stations transmitting at mutually different frequencies. It is con- nected to the output of the frequency discriminator of the receiver and comprises means for forming a logic signal which indicates the presence or absence of noise, a gate which transmits the clockpulses when a logic signal indi- cates the presence of noise, means for counting the trans- mitted clockpulses and for supplying a command signal for controlling a channel selection device, either which dur- ing a sequence of n time intervals ? a number of pulses counted during each time intervals ? attains a first threshold, or when the number of pulses counted during a time interval ? attains a second threshold which is higher than the first threshold. Noise pulses are used for generating a command signal for controlling the automatic selection of the frequency by making itself independent to a large extent of the speed of the mobile body.
298339
Chastagnier Jean
Massip Jean C.
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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