Multiplex communications – Wide area network – Packet switching
Patent
1982-03-26
1984-05-08
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 76, 307511, H04J 106, H04H 500, H04M 132
Patent
active
044479018
ABSTRACT:
Dc voltages (E) of different levels are obtained at the output terminal of a phase comparator according to the broadcasting mode. A voltage comparator discriminates the broadcasting mode according to the level of the dc voltage. The voltage comparing circuit has two threshold voltages (EL), (EH) of different levels. The broadcasting mode is discriminated by detecting within which one of the three voltage ranges defined by the threshold voltages (EL), (EH) the dc voltage (E) falls. If E<EL, the dual-sound broadcasting mode is discriminated. If E<EH, the stereophonic mode is discriminated. If EL<E<EH, the monaural broadcasting mode is discriminated.
A subcarrier detector discriminates if the broadcasting mode is the monaural broadcasting mode or the multiplex broadcasting mode through detection of the subcarrier.
If a discrimination result indicating the monaural broadcasting mode is available from the subcarrier detector, a priority circuit outputs a discrimination signal representing the monaural broadcasting mode irrespective of the discrimination result from the voltage comparator.
REFERENCES:
patent: 3956710 (1976-05-01), Seitz et al.
patent: 4000476 (1976-12-01), Walker et al.
patent: 4016366 (1977-04-01), Kurata
patent: 4085288 (1978-04-01), Viswanthan
Olms Douglas W.
Scutch III Frank M.
Tokyo Shibaura Denki Kabushiki Kaisha
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