Ari-Signaldetektionsschaltung

Signal detection circuit for broadcast road traffic information

Abstract

The circuit amplitude-modulates a 125 Hz data identification signal (DK) on a 57 kHz station identification signal (SK) and detects by a separate circuit (5), fed from the station identification signal detector (2) via a low-pass filter (3). The LP filter extracts the DC component and also provides an output for testing (4) the station identification.Another low-pass filter (7) extracts the DC component from the data identification signal for testing (8), subject to the output from a reset device (9) controlled by the station identification test result (C).

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