Modulator utilizing high and low frequency carriers
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United States of America Patent
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-
Nov 6, 1984
Grant Date -
N/A
app pub date -
Jun 7, 1982
filing date -
Jun 7, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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