Electronic circuit, modulation method, information processing device, and information processing method
First Claim
1. An electronic circuit for amplitude-modulating digital data transmitted via an antenna including a resonance circuit, said electronic circuit comprising:
- a modulation circuit, having a first transistor, for amplitude-modulating a carrier wave applied to the base of said first transistor into an amplitude-modulated wave in accordance with a signal wave applied to the emitter of said first transistor and for supplying said amplitude-modulated wave to said antenna via the collector of said first transistor; and
a signal-wave generation circuit for inputting a first pulse signal in a rectangular waveform corresponding to said digital data, for generating said signal wave in such a manner as to correspond to a second pulse signal whose waveform is shaped so that the level at each rise time of each pulse of said first input pulse signal becomes higher than the high level in a steady state of said first signal and the level at each fall time of each pulse of said first input pulse signal becomes lower than the low level in the steady state of said first signal, and for applying said generated signal wave to the emitter of said first transistor.
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Accused Products
Abstract
A shaped-wave application section inputs a first pulse signal corresponding to transmission data output from a transmission data output section, and applies, to a modulation and amplification section, a signal wave corresponding to a second pulse signal such that the waveform of the first pulse signal is shaped. The pulse signal applied to the base of the transistor of the modulation and amplification section is amplitude-modulated into an amplitude-modulated wave in which the amplitude-modulated portion is strengthened, in accordance with the signal wave corresponding to the second pulse signal applied to the emitter thereof. The amplitude-modulated wave is supplied to an antenna section including a resonance circuit via the collector thereof, and is transmitted as an electromagnetic wave from the antenna section.
35 Citations
16 Claims
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1. An electronic circuit for amplitude-modulating digital data transmitted via an antenna including a resonance circuit, said electronic circuit comprising:
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a modulation circuit, having a first transistor, for amplitude-modulating a carrier wave applied to the base of said first transistor into an amplitude-modulated wave in accordance with a signal wave applied to the emitter of said first transistor and for supplying said amplitude-modulated wave to said antenna via the collector of said first transistor; and
a signal-wave generation circuit for inputting a first pulse signal in a rectangular waveform corresponding to said digital data, for generating said signal wave in such a manner as to correspond to a second pulse signal whose waveform is shaped so that the level at each rise time of each pulse of said first input pulse signal becomes higher than the high level in a steady state of said first signal and the level at each fall time of each pulse of said first input pulse signal becomes lower than the low level in the steady state of said first signal, and for applying said generated signal wave to the emitter of said first transistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A modulation method for use with a modulation circuit, having a transistor, which amplitude-modulates digital data transmitted via an antenna including a resonance circuit, for amplitude-modulating a carrier wave applied to the base of said transistor into an amplitude-modulated wave in accordance with a signal wave applied to the emitter of said transistor and for supplying said amplitude-modulated wave to said antenna via the collector of said transistor, said modulation method comprising the steps of:
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inputting a first pulse signal in a rectangular waveform corresponding to said digital data;
generating said signal wave in such a manner as to correspond to a second pulse signal whose waveform is shaped so that the level at each rise time of each pulse of said first input pulse signal becomes higher than the high level in a steady state of said first signal and the level at each fall time of each pulse of said first input pulse signal becomes lower than the low level in the steady state of said first signal; and
applying said generated signal wave to the emitter of said transistor.
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11. An electronic circuit for amplitude-modulating digital data transmitted via an antenna including a resonance circuit, said electronic circuit comprising:
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a modulation circuit, having a field-effect transistor, for amplitude-modulating a carrier wave applied to the gate of said field-effect transistor into an amplitude-modulated wave in accordance with a signal wave applied to the source of said field-effect transistor and for supplying said amplitude-modulated wave to said antenna via the drain of said field-effect transistor; and
a signal-wave generation circuit for inputting a first pulse signal in a rectangular waveform corresponding to said digital data, for generating said signal wave in such a manner as to correspond to a second pulse signal whose waveform is shaped so that the level at each rise time of each pulse of said first input pulse signal becomes higher than the high level in a steady state of said first pulse signal and the level at each fall time of each pulse of said first input pulse signal becomes lower than the low level in the steady state of said first pulse signal, and for applying said generated signal wave to the source of said field-effect transistor.
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12. A modulation method for use with a modulation circuit, having a field-effect transistor, which amplitude-modulates digital data transmitted via an antenna including a resonance circuit, for amplitude-modulating a carrier wave applied to the source of said field-effect transistor into an amplitude-modulated wave in accordance with a signal wave applied to the source of said field-effect transistor and for supplying said amplitude-modulated wave to said antenna via the drain of said field-effect transistor, said modulation method comprising the steps of:
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inputting a first pulse signal in a rectangular waveform corresponding to said digital data;
generating said signal wave in such a manner as to correspond to a second pulse signal whose waveform is shaped so that the level at each rise time of each pulse of said first input pulse signal becomes higher than the high level in a steady state of said first pulse signal and the level at each fall time of each pulse of said first input pulse signal becomes lower than the low level in the steady state of said first pulse signal; and
applying said generated signal wave to the source of said field-effect transistor.
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13. An information processing device for amplitude-modulating first digital information and transmitting the information, said information processing device comprising:
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modulation means, having a transistor, for amplitude-modulating a carrier wave applied to the base of said transistor into an amplitude-modulated wave in accordance with a signal wave which corresponds to said first information, the signal wave being applied to the emitter of said transistor, and for outputting said amplitude-modulated wave via the collector of said transistor;
first output means for outputting said carrier wave applied to the base of said transistor;
second output means for outputting a first pulse signal in a rectangular waveform corresponding to said first information;
signal-wave generation means for generating said signal wave in such a manner as to correspond to a second pulse signal whose waveform is shaped so that the level at each rise time of each pulse of said first pulse signal output from said second output means becomes higher than the high level in a steady state of said first signal and the level at each fall time of each pulse of said first pulse signal becomes lower than the low level in the steady state of said first signal, and for applying said generated signal wave to the emitter of said first transistor; and
antenna means, having a resonance circuit, for transmitting an electromagnetic wave based on said amplitude-modulated wave output from said modulation means to another information processing device. - View Dependent Claims (14, 15)
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16. An information processing method for use with an information processing device comprising a modulation circuit, having a transistor, for amplitude-modulating a carrier wave applied to the base of said transistor into an amplitude-modulated wave in accordance with a signal wave which corresponds to digital information to be transmitted, the signal wave being applied to the emitter of said transistor, and for outputting said amplitude-modulated wave via the collector of said transistor;
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an antenna, having a resonance circuit, for transmitting an electromagnetic wave based on said amplitude-modulated wave output from said modulation circuit to another information processing device, said information processing method comprising the steps of;
outputting said carrier wave applied to the base of said transistor;
outputting a first pulse signal in a rectangular waveform corresponding to said digital information;
generating said signal wave in such a manner as to correspond to a second pulse signal whose waveform is shaped so that the level at each rise time of each pulse of said first pulse signal becomes higher than the high level in a steady state of said first pulse signal and the level at each fall time of each pulse of said first pulse signal becomes lower than the low level in the steady state of said first pulse signal; and
applying said generated signal wave to the emitter of said first transistor.
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Specification