Modulator utilizing high and low frequency carriers

Details Modulator utilizing high and low frequency carriers Modulator utilizing high and low frequency carriers

1982-06-07

1984-11-06

Laroche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 16T, 332 22, 455102, H03C 154

Patent

active

044814909

ABSTRACT:
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.

REFERENCES:
patent: 3118117 (1964-01-01), King et al.

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