AM data multiplexing modulation apparatus
First Claim
Patent Images
1. An AM data multiplexing modulation apparatus comprising:
- an AM modulator for AM modulating a carrier having a frequency of fc by an analog signal;
a first modulator for modulating a carrier having a frequency of (fc+fα
) by a baseband digital signal generated by a baseband digital signal generator;
a sign inverter for inverting a sign of the baseband digital signal generated by the baseband digital signal generator;
a second modulator for modulating a carrier having a frequency of (fc-fα
) by an output signal from said sign inverter;
a first adder for adding an output signal from said first modulator to an output signal from said second modulator; and
a second adder for adding an output signal from said AM modulator to an output signal from said first adder.
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Abstract
An AM data multiplexing modulation apparatus for multiplexing a digital signal to an AM modulation signal without adversely affecting an AM sync detection output even if AM sync detection is performed. An AM modulator AM modulates a carrier having a frequency fc by an input signal, an orthogonal modulator 3 orthogonally modulates a carrier having a frequency (fc+fα) by a QPSK baseband digital signal generated by a QPSK baseband digital signal generator 2, a sign inverter and a complex conjugate unit change the sign of a signal having the same phase as a reference carrier of vector shift and corresponding to a dibit formed by the QPSK baseband digital signal generated by the QPSK baseband digital signal generator, another orthogonal modulator orthogonally modulates a carrier having a frequency (fc-fα) by an output of the complex conjugate unit, the outputs of the two orthogonal modulators are added by an adder, this addition result is added to the output of the AM modulator by another adder which outputs an AM data multiplexing modulation output.
12 Citations
6 Claims
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1. An AM data multiplexing modulation apparatus comprising:
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an AM modulator for AM modulating a carrier having a frequency of fc by an analog signal; a first modulator for modulating a carrier having a frequency of (fc+fα
) by a baseband digital signal generated by a baseband digital signal generator;a sign inverter for inverting a sign of the baseband digital signal generated by the baseband digital signal generator; a second modulator for modulating a carrier having a frequency of (fc-fα
) by an output signal from said sign inverter;a first adder for adding an output signal from said first modulator to an output signal from said second modulator; and a second adder for adding an output signal from said AM modulator to an output signal from said first adder.
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2. An AM data multiplexing modulation apparatus comprising:
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an AM modulator for AM modulating a carrier having a frequency of fc by an analog signal; a first balanced modulator for modulating a carrier having a frequency of (fc+fα
) by an ASK baseband digital signal generated by an ASK baseband digital signal generator;a sign inverter for inverting a sign of the ASK baseband digital signal generated by the ASK baseband digital signal generator; a second balanced modulator for modulating a carrier having a frequency of (fc-fα
) by an output signal from said sign inverter;a first adder for adding an output signal from said first balanced modulator to an output signal from said second balanced modulator; and a second adder for adding an output signal from said AM modulator to an output signal from said first adder.
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3. An AM data multiplexing modulation apparatus comprising:
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an AM modulator for AM modulating a carrier having a frequency of fc by an analog signal; a first orthogonal modulator for orthogonally modulating a carrier having a frequency of (fc+fα
) by a four-phase PSK baseband digital signal generated by a four-phase PSK baseband digital signal generator;a sign inverter for inverting the sign of a signal having the same phase as a reference carrier phase of vector shift and corresponding to a dibit formed by the four-phase PSK baseband digital signal generated by the four-phase PSK baseband digital signal generator; a second orthogonal modulator for orthogonally modulating a carrier having a frequency of (fc-fα
) by an output signal from said sign inverter;a first adder for adding an output signal from said first orthogonal modulator to an output signal from said second orthogonal modulator; and a second adder for adding an output signal from said AM modulator to an output signal from said first adder.
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4. An AM data multiplexing modulation apparatus comprising:
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an AM modulator for AM modulating a carrier having a frequency of fc by an analog signal; a first modulator for orthogonally modulating a carrier having a frequency of (fc+fα
) by 2 bits (an, bn) of a multi-phase (8-phase or more) PSK baseband digital signal (an, bn, cn, dn, . . . ) generated by a multi-phase PSK baseband digital signal generator, the phase of the carrier being controlled in accordance with a baseband digital signal (cn, dn, . . . ) of the third and higher bits of the multi-phase PSK baseband digital signal;a sign inverter for inverting the sign of the multi-phase PSK baseband digital signal (an, bn, cn, dn, . . . ) generated by the multi-phase PSK baseband digital signal generator; a complex conjugate unit for changing a dibit (-an, -bn) of two bits of the multi-phase PSK baseband digital signal with the sign thereof being inverted by said sign inverter, to a complex conjugate digital signal (-an, bn); a second modulator for orthogonally modulating a carrier having a frequency of (fc-fα
) by the complex conjugate digital signal (-an, bn) changed by said complex conjugate unit, the phase of the carrier being controlled in accordance with a baseband digital signal (-cn, -dn, . . . ) of the third and higher bits of the multi-phase PSK baseband digital signal with the sign thereof being inverted by said sign inverter;a first adder for adding an output signal from said first modulator to an output signal from said second modulator; and a second adder for adding an output signal from said AM modulator to an output signal from said first adder.
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5. An AM data multiplexing modulation apparatus comprising:
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an AM modulator for AM modulating a carrier having a frequency of fc by an analog signal; a first modulator for FSK modulating a carrier having a frequency of (fc+fα
+Δ
f) and a carrier having a frequency of (fc+fα
-Δ
f) by an FSK baseband digital signal generated by an FSK baseband digital signal generator;a sign inverter for inverting the sign of the FSK baseband digital signal generated by the FSK baseband digital signal generator; a second modulator for FSK modulating a carrier having a frequency of (fc-fα
+Δ
f) and a carrier having a frequency of (fc-fα
-Δ
f) by an output from said sign inverter;a first adder for adding an output signal from said first modulator to an output signal from said second modulator; and a second adder for adding an output signal from said AM modulator to an output signal from said first adder.
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6. An AM data multiplexing modulation apparatus comprising:
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an AM modulator for AM modulating a carrier having a frequency of fc by an analog signal; a first orthogonal modulator for orthogonally modulating carriers having frequencies of (fc+fn), where n is a natural number, by a four-phase PSK baseband digital signal generated by a four-phase PSK baseband digital signal generator; a sign inverter for inverting the sign of a signal having the same phase as a reference carrier phase of vector shift and corresponding to a dibit formed by the four-phase PSK baseband digital signal generated by the four-phase PSK baseband digital signal generator; a second orthogonal modulator for orthogonally modulating carriers having frequencies of (fc-fn), where n is a natural number, by an output from said sign inverter; a first adder for adding an output signal from said first orthogonal modulator to an output signal from said second orthogonal modulator; and a second adder for adding an output signal from said AM modulator to an output signal from said first adder.
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Specification
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Current AssigneeJVC Kenwood Corporation
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Original AssigneeKabushiki Kaisha Kenwood
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InventorsNagasaka, Hiroyuki, Suzuki, Shoichi, Shinoda, Atsushi, Shiraishi, Kenichi, Okazaki, Ryuichi, Takegahara, Toshiyuki
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Primary Examiner(s)Patel, Ajit
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Assistant Examiner(s)NGUYEN, BRIAN D
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Application NumberUS08/870,016Time in Patent Office803 DaysField of Search370/203, 370/204, 370/205, 370/481, 370/482, 370/480, 370/206, 370/207, 370/208, 370/209, 375/268, 375/269US Class Current370/208CPC Class CodesH04H 20/36 for AM broadcastsH04L 5/06 the signals being represent...
