Method for distinguishing an identification signal modulating a carrier signal and arrangement for carrying out the method

摘要

The signal to be demodulated is supplied via an A/D converter to a filter which selects a frequency band in the range of the carrier frequency. Several reference signals are used for demodulating two identification frequencies, the presence/absence of which is checked in a logic circuit. This comparison makes it possible to determine whether, for example, the television signal contains information on the mono/stereo/bilingual type of transmission. <IMAGE>