Circuit for a demodulator for a radio data signal in a radio rec

Details Circuit for a demodulator for a radio data signal in a radio rec Circuit for a demodulator for a radio data signal in a radio rec

1994-05-20

1996-05-28

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

375333, H04L 2722

Patent

active

055219446

ABSTRACT:
In a circuit for a demodulator of a radio data signal in a radio receiver, the multiplex signal in digital form is mixed into the baseband, in two phase positions shifted 90.degree. with respect to each other, after band-pass filtering, together with a reference carrier generated at a sampling clock rate produced in the radio receiver, thus producing a first and a second mix signal. A first and a second auxiliary signal with, respectively, a sine waveform and a cosine waveform are produced. The first mix signal is multiplied by the first auxiliary signal, and the second mix signal by the second auxiliary signal. The results of these multiplications are added together, producing a first output signal. The first mix signal is multiplied by the second auxiliary signal, and the second mix signal by the first auxiliary signal, and the results subtracted from each other, thus producing a second output signal. The phase position of the auxiliary signals is controlled in such a manner that the first output signal corresponds to the radio data signal (RDS) shifted down into the baseband.

REFERENCES:
patent: 3949401 (1976-04-01), Hegeler et al.
patent: 4584534 (1986-04-01), Lijphart et al.
patent: 4635279 (1987-01-01), Nossen
patent: 4888793 (1989-12-01), Chanroo et al.
patent: 5175507 (1992-12-01), Roither
patent: 5278560 (1994-01-01), Hegeler et al.
patent: 5311555 (1994-05-01), Ichiyoshi

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