Radio apparatus
First Claim
Patent Images
1. A radio apparatus comprising:
- a baseband signal generator to generate a baseband signal;
a sine wave substituting device to substitute a transition part of the baseband signal having a logic level switching from “
0”
to “
1”
or “
1”
to “
0”
with a multivalue signal of a sine wave;
a delta sigma modulator to modulate the multivalue signal into a binary signal;
a carrier wave generator to generate a carrier wave; and
a carrier wave modulator to modulate the carrier wave with the binary signal of the delta sigma modulator;
a power amplifier to amplify a transmission signal from the carrier wave modulator;
a band-pass filter to band-limit the amplified transmission signal; and
an antenna to output the band-limited transmission signal from the band-pass filter as a radio wave.
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Accused Products
Abstract
A radio apparatus includes a baseband signal generator to generate a baseband signal; a sine wave substituting device to substitute a transition part of the baseband signal in which a logic level switches from “0” to “1” or “1” to “0” with a sine wave represented with multi-values; and a delta sigma modulator to modulate the signal represented in the multi-values into a binary signal.
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Citations
16 Claims
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1. A radio apparatus comprising:
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a baseband signal generator to generate a baseband signal; a sine wave substituting device to substitute a transition part of the baseband signal having a logic level switching from “
0”
to “
1”
or “
1”
to “
0”
with a multivalue signal of a sine wave;a delta sigma modulator to modulate the multivalue signal into a binary signal; a carrier wave generator to generate a carrier wave; and a carrier wave modulator to modulate the carrier wave with the binary signal of the delta sigma modulator; a power amplifier to amplify a transmission signal from the carrier wave modulator; a band-pass filter to band-limit the amplified transmission signal; and an antenna to output the band-limited transmission signal from the band-pass filter as a radio wave. - View Dependent Claims (2, 3, 4)
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5. A radio apparatus comprising:
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a baseband signal generator to generate a baseband signal; a transition part substituting device to substitute a transition part of the baseband signal having a logic level switching from “
0”
to “
1”
or “
1”
to “
0”
with a multivalue sigmoid function;a delta sigma modulator to modulate the multivalue signal into a binary signal; a carrier wave generator to generate a carrier wave; a carrier wave modulator to modulate the carrier wave with the binary signal of the delta sigma modulator; a power amplifier to amplify a transmission signal from the carrier wave modulator; a band-pass filter to band-pass the amplified transmission signal; and an antenna to output the band-limited transmission signal from the band-pass filter as a radio wave. - View Dependent Claims (6, 7, 8)
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9. A radio apparatus comprising:
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a baseband signal generator to generate a baseband signal; a sine wave substituting device to substitute a transition part of the baseband signal in which a logic level switches from “
0”
to “
1”
or “
1”
to “
0”
with a multivalue signal of sine wave;a carrier wave modulator to generate a carrier wave and modulate the carrier wave with the baseband signal outputted by the sine wave substituting device; a delta sigma modulator to modulate an output signal from the carrier wave modulator into a binary signal; a power amplifier to amplify a transmission signal from the delta sigma modulator; a band-pass filter to band-limit the amplified transmission signal; and an antenna to output the band-limited transmission signal from the band-pass filter as a radio wave. - View Dependent Claims (10, 11, 12)
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13. A radio apparatus comprising:
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a baseband signal generator to generate a first baseband signal and a second baseband signal; a first sine wave substituting device to substitute a transition part of the first baseband signal having a logic level switching from “
0”
to “
1”
or “
1”
to “
0”
with a first multivalue signal of a sine wave;a first delta sigma modulator to modulate the first multivalue signal into a first binary signal; a first carrier wave generator to generate a first carrier wave; and a first carrier wave modulator to modulate the first carrier wave with the first binary signal of the first delta sigma modulator; a second sine wave substituting device to substitute a transition part of the second baseband signal having a logic level switching from “
0”
to “
1”
or “
1”
to “
0”
with a second multivalue signal of a sine wave;a second delta sigma modulator to modulate the second multivalue signal into a second binary signal; a second carrier wave generator to generate a second carrier wave; and a second carrier wave modulator to modulate the second carrier wave with the second binary signal of the second delta sigma modulator; an adder to synthesize a modulated carrier wave from a first transmission signal from the first carrier wave modulator and a second transmission signal from the second carrier wave modulator; a power amplifier to amplify the modulated carrier wave from the adder; a band-pass filter to band-limit an amplified transmission signal from the power amplifier; and an antenna to output the band-limited transmission signal from the band-pass filter as a radio wave. - View Dependent Claims (14, 15, 16)
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Specification