Phase controlling phase of local subcarrier signal to correspond

Details Phase controlling phase of local subcarrier signal to correspond Phase controlling phase of local subcarrier signal to correspond

1991-02-14

1993-08-31

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

Frequency or phase modulation

4551803, 455214, 455263, 455265, 455304, 455312, 329325, 329336, 329359, 329360, 381 4, 381 13, H04B 116

Patent

active

052416879

ABSTRACT:
Apparatus for demodulating information signals frequency-modulated on an RF carrier signal carrying spectral components within the audio frequency range, a pilot carrier signal having an imparted phase shift from the phase of the transmitted pilot carrier signal, and amplitude-modulated spectral components having another imparted phase shift in a subcarrier channel frequency range above the audio frequency range. The apparatus includes a demodulator for demodulating the frequency-modulated information signals to provide a detected composite signal which includes a detected pilot carrier characterized by an imparted phase shift due to the effects of multipath reception, and detected amplitude modulated spectral components exhibiting another multipath induced phase shift. The apparatus also includes a source of a local subcarrier signal, a phase controller coupled to the source for controlling the phase of the local subcarrier signal to corresponding substantially to that of the transmitted pilot carrier signal, and a combiner for combining the local subcarrier signal with the detected composite signal to recover the information signal carried by the amplitude modulated spectral components.

REFERENCES:
patent: 3328529 (1967-06-01), Heald
patent: 3701948 (1972-10-01), McAuliffe
patent: 3714595 (1973-01-01), Denenberg et al.
patent: 4002991 (1977-01-01), Ogita
patent: 4633496 (1986-12-01), Ohtaki et al.
patent: 4821322 (1989-04-01), Bose
patent: 4881274 (1989-11-01), Tazaki et al.
patent: 5046129 (1991-09-01), Short

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