SINGLE SIDEBAND AM-FM MODULATION SYSTEM
First Claim
1. Single sideband AM-FM modulation means comprising a sub-carrier frequency signal generator, means connected to amplitude modulate said sub-carrier signal, a radio frequency signal generator, means to frequency modulate said radio frequency signal with said modulated sub-carRier signal, to create multiple sidebands, frequency multiplying means connected to said frequency generator, and narrow bandpass filter means tuned to a frequency between two of said multiple sidebands so as to pass one sideband of said modulated signal.
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Abstract
A sub-carrier signal is amplitude modulated. This sub-carrier AM modulated signal is then used to frequency modulate a radio frequency carrier. The radio frequency is then multiplied. One sideband in the modulated radio frequency signal is passed through a bandpass filter and then transmitted.
150 Citations
2 Claims
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1. Single sideband AM-FM modulation means comprising a sub-carrier frequency signal generator, means connected to amplitude modulate said sub-carrier signal, a radio frequency signal generator, means to frequency modulate said radio frequency signal with said modulated sub-carRier signal, to create multiple sidebands, frequency multiplying means connected to said frequency generator, and narrow bandpass filter means tuned to a frequency between two of said multiple sidebands so as to pass one sideband of said modulated signal.
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2. Apparatus as in claim 1 wherein said bandpass filter means is a narrow filter, of substantially 5 KHz.
Specification
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Current AssigneeWilliam A. Hayes
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Original AssigneeWilliam A. Hayes
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InventorsHayes, William A.
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Primary Examiner(s)Safourek, Benedict V.
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Application NumberUS05/140,792Time in Patent Office635 DaysField of Search332/16,17,44,45 325/45,126,137,138,145,146US Class Current455/102CPC Class CodesH04B 1/68 for wholly or partially sup...
