Modulation system with carrier control
First Claim
Patent Images
1. The method of generating a modulated carrier signal, comprising the steps of:
- generating a carrier signal;
generating a modulation signal;
modulating said carrier signal with said modulation signal; and
concurrent with said step of modulating, adjusting the power of said carrier signal in proportion to the instantaneous power of said modulating signal so that the instantaneous power of said carrier signal is proportional to the power of said modulation signal which is available to modulate said carrier signal, said instantaneous power of said carrier signal being at least sufficient to avoid overmodulation by said instantaneous power of said modulating signal.
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Abstract
System for controlling the magnitude of an RF carrier signal that is concurrently being amplitude-modulated, whereby there is provided an amplitude-modulated signal that is compatible for reception either as a conventional AM signal or as an SSB signal. The instantaneous power of a carrier signal is adjusted in response to the instantaneous power of a modulation signal available to modulate the carrier signal. The carrier signal power is allowed to fluctuate between a maximum value and a minimum or no-modulation value, which may provide a minimum carrier level notwithstanding the absence of a modulating signal.
54 Citations
19 Claims
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1. The method of generating a modulated carrier signal, comprising the steps of:
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generating a carrier signal; generating a modulation signal; modulating said carrier signal with said modulation signal; and concurrent with said step of modulating, adjusting the power of said carrier signal in proportion to the instantaneous power of said modulating signal so that the instantaneous power of said carrier signal is proportional to the power of said modulation signal which is available to modulate said carrier signal, said instantaneous power of said carrier signal being at least sufficient to avoid overmodulation by said instantaneous power of said modulating signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. The method of generating a modulated carrier signal, comprising the steps of:
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generating a modulation signal, concurrently generating a carrier signal whose power is substantially proportional to the instantaneous power of said modulation signal in a predetermined relation, so that the power of said concurrently generated carrier signal is determined by the instantaneous power of said modulation signal and is at least sufficient to avoid overmodulation by the instantaneous power of said concurrent modulation signal; and modulating said carrier signal with said modulation signal. - View Dependent Claims (13, 14)
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15. Apparatus for generating a modulated signal, comprising:
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means operative to generate a carrier signal; means operative in response to a modulation signal to modulate said carrier signal; and control circuit means operatively connected to said carrier signal generating means and operative in response to the instantaneous power of said modulation signal to adjust the power of the carrier signal to a power which is in predetermined proportion to said instantaneous power of said modulation signal and which is at least sufficient to avoid being overmodulated by said instantaneous power of said modulation signal.
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16. Apparatus for generating a modulated signal, comprising:
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means for generating a carrier signal; means responsive to a modulation signal for modulating the amplitude of said carrier signal; and control means operatively associated with said carrier signal generating means and operative in response to the instantaneous power of said modulation signal to substantially instantaneously adjust the concurrent power of said carrier signal in a predetermined relation to the instantaneous power of said modulation signal, so that said concurrent carrier signal power is determined by said instantaneous power of said modulation signal and is at least sufficient to avoid being overmodulated by said instantaneous power of the modulation signal. - View Dependent Claims (17, 18, 19)
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Specification