Carrier regeneration circuit for polyphase modulation system

Details Carrier regeneration circuit for polyphase modulation system Carrier regeneration circuit for polyphase modulation system

1979-03-02

1981-03-10

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329112, 329124, 375 81, 375 86, H03D 318

Patent

active

042557135

ABSTRACT:
An n (=8, 9)-valued polyphase modulation system having circuit construction for carrier regeneration in which not only correct phase demodulation is effected but also any AM components of the regenerated carrier wave are effectively compensated for and in which the decision circuit is adapted to produce a signal output having no phase ambiguity which is coupled to a .pi./4 phase modulator unit of the carrier generator to serve as a drive signal therefor.

REFERENCES:
patent: 3845412 (1974-10-01), Rearwin et al.
patent: 3983499 (1976-09-01), Tan
patent: 4039961 (1977-08-01), Ishio et al.
patent: 4055727 (1977-10-01), Katoh
patent: 4099130 (1978-07-01), Yoshida
patent: 4109102 (1978-08-01), Yoshida et al.
patent: 4114710 (1978-09-01), Katoh et al.
patent: 4143322 (1979-03-01), Shimamura

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