Societa Italiana Telecomunicazioni Siemens S.p.a.

Italtel Societa Italiana Telecomunicazioni S.p.a.

Italtel Societa Italiana

Armando Colamonico

Marcello Donati

Manlio Saba

Direct conversion receiver for digital signals and method for

Base station for a mobile digital system with the frequency hopping

A frequency discriminator designed to respond to a selected incoming tone frequency comprises a pulse generator connected via an adjustable frequency divider to a binary 8-stage counter which generates eight relatively staggered pulse trains whose cadence varies with the setting of the divider. This setting can be varied, e.g. in a programmed manner according to a pattern of tone frequencies to be recognized, while incoming signals are applied to an eight-path filter driven by the staggered pulse trains. When the cadence of the pulse trains matches an incoming tone frequency, the filter emits an output exceeding a predetermined threshold.

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Milan, Italy

Armando Colamonico