Transmission apparatus, sending apparatus, and receiving apparatus, and transmission method
First Claim
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1. A transmission apparatus, comprising:
- modulation means for phase shift modulating a sub-carrier based on a digital data and outputting a modulated signal;
infrared emitting means for modulating an infrared-ray, being the main carrier wave, based on said modulated signal outputted from said modulation means and outputting the modulated infrared-ray resultant from the modulation;
light receiving means for receiving said modulated infrared-ray from said infrared emitt ing means and outputting a received signal corresponding to said modulated signal; and
demodulation means for demodulating said received signal outputted from said light receiving means and regenerating said digital data,wherein said modulation means includes transmission channel clock generating means for generating a transmission channel clock having a frequency 5/4 times the data clock based on said digital data, and outputting said modulated signal at the timing of said transmission channel clock, and furtherwherein said demodulation means includes data clock regenerating means for generating said data clock based on said received signal, and outputting said digital data at the timing of said data clock.
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Abstract
The transmitter QPSK-modulates the audio data, generates a transmission channel clock having a frequency 5/4 times the data clock based on the audio data, and outputs the modulated signal resulted from QPSK-modulation at the timing of the transmission channel clock. The infrared emitter emits infrared-rays based on the modulated signal. Digital data is thus efficiently transmitted by way of infrared-rays with suppressed complexity of data processing for modulation and demodulation.
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Citations
70 Claims
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1. A transmission apparatus, comprising:
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modulation means for phase shift modulating a sub-carrier based on a digital data and outputting a modulated signal; infrared emitting means for modulating an infrared-ray, being the main carrier wave, based on said modulated signal outputted from said modulation means and outputting the modulated infrared-ray resultant from the modulation; light receiving means for receiving said modulated infrared-ray from said infrared emitt ing means and outputting a received signal corresponding to said modulated signal; and demodulation means for demodulating said received signal outputted from said light receiving means and regenerating said digital data, wherein said modulation means includes transmission channel clock generating means for generating a transmission channel clock having a frequency 5/4 times the data clock based on said digital data, and outputting said modulated signal at the timing of said transmission channel clock, and further wherein said demodulation means includes data clock regenerating means for generating said data clock based on said received signal, and outputting said digital data at the timing of said data clock. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A transmission apparatus, comprising;
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modulation means for phase shift modulating a sub-carrier based on a digital data and outputting modulated signal; and infrared emitting means for modulating an infrared-ray, being the main carrier wave, based on said modulated signal outputted from said modulation means and for outputting the resultant modulated infrared-ray; wherein said modulation means includes transmission channel clock generating means for generating a transmission channel clock having a frequency 5/4 times the data clock based on said digital data, and outputting said modulated signal at the timing of said transmission channel clock. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. A receiving apparatus for receiving a digital data comprising:
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receiving means for receiving an infrared-ray and outputting a received signal corresponding to the infrared-ray; and demodulation means for demodulating said received signal outputted from said receiving means and regenerating said digital data; said demodulation means having data clock regenerating means for generating a data clock having a frequency 4/5 times the clock based on said received signal, and outputting said digital data at the timing of said data clock.
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48. A transmission method, comprising the steps of:
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phase shift modulating a sub-carrier based on a digital data and outputting a modulated signal; modulating an infrared-ray, being the main carrier wave, based on said modulated signal and outputting a modulated infrared-ray; receiving said modulated infrared-ray and outputting a received signal corresponding to said modulated signal; and demodulating said received signal and regenerating said digital data; wherein said step of phase shift modulating includes the steps of generating a transmission channel clock having a frequency 5/4 times the data clock based on said digital data and outputting said modulated signal at the timing of said transmission channel clock, and further, wherein said step of demodulating includes the steps of generating said data clock based on said received signal and outputting said digital data at the timing of said data clock. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70)
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Specification