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US 9,590,663 B2Granted
Radio apparatus
AssigneeHitachi, Ltd.
InventorsMasahiro Aono, Ken Takei
Life of this patent
Estimating the term…
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.
Claims16
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.
7 more elements
A radio apparatus comprising:
- 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.
6 more elements
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 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.
5 more elements
A radio apparatus comprising:
- 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.
13 more elements
Dependencies are inferred from the claim text.