Telecommunications – Receiver or analog modulated signal frequency converter – Modulation distortion or cross talk correction or elimination
Patent
1978-04-25
1980-07-08
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Modulation distortion or cross talk correction or elimination
179 1GJ, 1791004ST, 328163, 455304, 455276, H04B 112
Patent
active
042119782
ABSTRACT:
A cross-talk component cancellation circuit is used in an angle-modulated wave signal transmission system for transmitting first and second angle-modulated wave signals of at least two channels, wherein a cross-talk component of the second angle-modulated wave signal is admixed in the first angle-modulated wave signal. The cross-talk component cancellation circuit comprises a phase inverter for phase inverting the second angle-modulated wave signal, a first circuit for mixing the second angle-modulated wave signal and the phase-inverted second angle-modulated wave signal in respective mixing quantities with the first angle-modulated wave signal, a circuit for varying the mixing quantity in which at least one angle-modulated wave signal out of the second angle-modulated wave signal and the phase-inverted second angle-modulated wave signal is mixed by the first mixing means, a second circuit for mixing the signal thus mixed by the first mixing means in respective specific mixing quantities with the second angle-modulated wave signal and the phase-inverted second angle-modulated wave signal thereby to produce third and fourth angle-modulated wave signals, a circuit for operating to produce as output from the third and fourth angle-modulated wave signals a control signal for variably controlling the mixing quantity of the mixing quantity varying means and to supply said control signal to said varying means, and a circuit for obtaining the first angle-modulated wave signal the cross-talk component of which has been cancelled by the first mixing means.
REFERENCES:
patent: 3864516 (1975-02-01), Kameoka et al.
patent: 4002840 (1977-01-01), Abe et al.
Bookbinder Marc E.
Victor Company of Japan , Limited
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