U.S. Philips Corporation

Wilhelmus A Van Gurp

Wilhelmus A Zwijsen

Antonius F Van Keeken

Maurice Bouland

Eddy M Van Damme

An F.M. demodulation circuit can be rendered insensitive to amplitude, level and waveform variations of the frequency-modulated carrier signal by using a frequency-demodulator (33,37) tuned to half the frequency of the carrier and preceded by a divide-by-two divider (21).

F.M. Demodulator with waveform correction circuit

In a PAL-SECAM color television receiver comprising a transcoder for converting a SECAM signal into a signal which is processable by a PAL decoder, and a systems change-over switch which can be operated by a SECAM identification circuit for automatically adapting the receiver to the reception of or SECAM signals, a blocking circuit which can be operated by a identification signal is used, which blocking circuit in the event a signal is received blocks the output signal from the SECAM identification circuit so that also in the event that a disturbed PAL signal is received said output signal does not adjust the systems change-over switch to the incorrect position.

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Eindhoven, Netherlands

Wilhelmus A Van Gurp