IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0310823
(2002-12-06)
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우선권정보 |
JP-2001-380206(2001-12-13) |
발명자
/ 주소 |
- Sakuma,Hirohisa
- Fujiwara,Jun
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
9 |
초록
▼
The present invention provides an acoustic transmitter for sequentially transmitting a plurality of pulse signals by sound. Each of the plurality of pulse signals is a signal of at least one modulated carrier wave, which has a predetermined frequency. The carrier wave of each of the pulse signals ha
The present invention provides an acoustic transmitter for sequentially transmitting a plurality of pulse signals by sound. Each of the plurality of pulse signals is a signal of at least one modulated carrier wave, which has a predetermined frequency. The carrier wave of each of the pulse signals has a mutually different frequency. The transmitter performs amplitude modulation and/or phase modulation based on transmission information, and modulation by a signal indicating a window function, for the carrier wave of each of pulse signals. Then the transmitter sequentially transmits the plurality of pulse signals by sound.
대표청구항
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What is claimed is: 1. An acoustic transmitter for sequentially transmitting a plurality of pulse signals by sound, each of said plurality of pulse signals being a signal of at least one modulated carrier wave, which has a predetermined frequency, the carrier wave of each of said plurality of pulse
What is claimed is: 1. An acoustic transmitter for sequentially transmitting a plurality of pulse signals by sound, each of said plurality of pulse signals being a signal of at least one modulated carrier wave, which has a predetermined frequency, the carrier wave of each of said plurality of pulse signals having a mutually different frequency, said acoustic transmitter comprising: a modulation unit, which performs amplitude modulation and/or phase modulation based on transmission information, and modulation by a signal indicating a window function, for the carrier wave of each of said plurality of pulse signals; and an acoustic transmission unit, which sequentially transmits said plurality of pulse signals modulated by said modulation unit by sound. 2. The acoustic transmitter according to claim 1, wherein when at least one of said plurality of pulse signals is a signal of a plurality of modulated carrier waves, said plurality of carrier waves have mutually different frequencies, and said modulation unit performs said modulation for said plurality of carrier waves based on individual pieces of transmission information respectively. 3. The acoustic transmitter according to claim 2, wherein said modulation unit further comprises a dividing unit, which creates said individual pieces of transmission information by dividing a piece of transmission information into the same number of partial pieces of information as the number of said carrier waves. 4. The acoustic transmitter according to claim 1, wherein said signal indicating said window function is a Gaussian window signal. 5. The acoustic transmitter according to claim 1, wherein: the modulation based on said transmission information by said modulation unit is phase shift keying, amplitude shift keying, or QAM; and said modulation unit converts said transmission information into a phase shift amount of said carrier wave in the case of said phase shift keying, converts said transmission information into an amplitude value of said carrier wave in the case of said amplitude shift keying, or converts said transmission information into an amplitude value and phase shift amount of said carrier wave in the case of QAM. 6. An acoustic signal transmission method for sequentially transmitting a plurality of pulse signals by sound, each of said plurality of pulse signals being a signal of at least one modulated carrier wave, which has a predetermined frequency, the carrier wave of each of said plurality of pulse signals having a mutually different frequency, said method comprising: performing amplitude modulation and/or phase modulation based on transmission information, and modulation by a signal indicating a window function, for the carrier wave of each of said plurality of pulse signals; and sequentially transmitting said modulated plurality of pulse signals by sound. 7. A program product for a computer installed in an acoustic transmitter for sequentially transmitting a plurality of pulse signals by sound, each of said plurality of pulse signals being a signal of at least one modulated carrier wave, which has a predetermined frequency, the carrier wave of each of said plurality of pulse signals having a mutually different frequency, said program product comprising: performing amplitude modulation and/or phase modulation based on digital data indicating transmission information for digital data representing the carrier wave of each of said plurality of pulse signals; and performing modulation by a signal indicating a window function for said digital data representing the carrier wave. 8. A program product for a computer installed in an acoustic transmitter for sequentially transmitting a plurality of pulse signals by sound, each of said plurality of pulse signals being a signal of at least one modulated carrier wave, which has a predetermined frequency, the carrier wave of each of said plurality of pulse signals having a mutually different frequency, said program product comprising: when the carrier wave is modulated using phase shift keying based on transmission information, converting said transmission information into a phase shift amount of said carrier wave, when the carrier wave is modulated using amplitude shift keying based on said transmission information, converting said transmission information into an amplitude value of said carrier wave, or when the carrier wave is modulated using QAM based on said transmission information, converting said transmission information into an amplitude value and phase shift amount of said carrier wave; and substituting said amount and/or value converted from said transmission information for one or more parameters of a formula that multiplies a formula expressing said at least one carrier wave by a formula expressing a window function, said one or more parameters being the phase shift amount of the carrier wave in the case of the phase shift keying, the amplitude value of the carrier wave in the case of the amplitude shift keying, or the amplitude value and the phase shift amount of the carrier wave in the case of QAM. 9. An acoustic receiver for receiving a plurality of pulse signals by sound, each of said plurality of pulse signals being a signal of at least one modulated carrier wave, which has a predetermined frequency, the carrier wave of each of said plurality of pulse signals having a mutually different frequency, said acoustic receiver comprising: an acoustic reception unit, which sequentially receives, as sound, said plurality of pulse signals after amplitude modulation and/or phase modulation based on transmission information, and modulation by a signal indicating a window function are performed for the carrier wave of each of said plurality of pulse signals, and converts the pulse signals into electric signals; and a demodulation unit, which performs Fourier transform for each of said plurality of pulse signals converted by said acoustic reception unit, reads a phase value and/or amplitude value at the frequency of the carrier wave of each pulse signal, and demodulates communication information based on the read value. 10. An acoustic reception method for receiving a plurality of pulse signals by sound, each of said plurality of pulse signals being a signal of at least one modulated carrier wave, which has a predetermined frequency, the carrier wave of each of said plurality of pulse signals having a mutually different frequency, said method comprising: sequentially receiving, as sound, said plurality of pulse signals after amplitude modulation and/or phase modulation based on transmission information, and modulation by a signal indicating a window function are performed for the carrier wave of each of said plurality of pulse signals, and converting the received pulse signals into electric signals; and performing Fourier transform for each of said converted plurality of pulse signals, reading a phase value and/or amplitude value at the frequency of said carrier wave of each pulse signal, and demodulating communication information based on the read value. 11. An acoustic communication device, which has an acoustic transmitter for sequentially transmitting a plurality of pulse signals by sound and an acoustic receiver for sequentially receiving said plurality of pulse signals by sound, each of said plurality of pulse signals being a signal of at least one modulated carrier waves, which has a predetermined frequency, the carrier wave of each of said plurality of pulse signals having a mutually different frequency, wherein said acoustic transmitter comprises: a modulation unit, which performs amplitude modulation and/or phase modulation based on transmission information, and modulation by a signal indicating a window function for the carrier wave of each of said plurality of pulse signals; and an acoustic transmission unit, which sequentially transmits the plurality of pulse signals modulated by said modulation unit by sound; and said acoustic receiver comprises: an acoustic reception unit, which sequentially receives the plurality of pulse signals transmitted by said acoustic transmission unit, and converts the pulse signals into electric signals; and a demodulation unit, which performs Fourier transform for each of said plurality of pulse signals converted by said acoustic reception unit, reads a phase value and/or amplitude value at the frequency of the carrier wave of each pulse signal, and demodulates communication information based on the read value. 12. An acoustic signal communication method performed by an acoustic communication device, which has an acoustic transmitter for sequentially transmitting a plurality of pulse signals by sound and an acoustic receiver for sequentially receiving said plurality of pulse signals by sound, each of said plurality of pulse signals being a signal of at least one modulated carrier waves, which has a predetermined frequency, the carrier wave of each of said plurality of pulse signals having a mutually different frequency, said method comprising: performing amplitude modulation and/or phase modulation based on transmission information, and modulation by a signal indicating a window function for the carrier wave of each of said plurality of pulse signals, in said acoustic transmitter; sequentially transmitting said plurality of pulse signals by sound, in said acoustic transmitter; and sequentially receiving said plurality of pulse signals transmitted by said acoustic transmitter, and converting the received pulse signals into electric signals, in said acoustic receiver; and performing Fourier transform for each of said plurality of converted pulse signals, reading a phase value and/or amplitude value at the frequency of the carrier wave of each pulse signal, and demodulating communication information based on the read value, in said acoustic receiver.
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