Acoustic communication device and acoustic signal communication method

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.

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.

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.