Bi-carrier modulator

Details Bi-carrier modulator Bi-carrier modulator

H - Electricity

03

C

332/67

H03C 1/02 (2006.01) H03D 7/16 (2006.01) H03D 7/14 (2006.01)

Patent

CA 1190612

ABSTRACT OF DISCLOSURE To minimize carrier leak in the modulation of voice frequencies to the desired line frequency for a carrier system, a first balanced modulator is operated at a low frequency where low carrier-leak modulators may be constructed and a second balanced modulator, directly coupled to the first, is employed The modulation frequency of said second modulator is very high compared to that of said low-frequency modulator. The sideband obtained from the second modulation stage is remote from said high-frequency carrier and a band-pass filter selects the desired sideband and substantially eliminates the high-frequency carrier and the other sideband. Thus, only a low amplitude of carrier leak is present which may cause interference with other channels.

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