| 摘要 |
An underwater modulator-demodulator (modem) apparatus for transmitting and receiving data at a high rate through water, said modem comprising: a) a transmitting section comprising: data source means, comprising digital data to be transmitted through water; serial-to-parallel data processing means, for splitting a serial data into n parallel channels; n-channel modulator means, for receiving data from said n parallel channels and for modulating the same with n pairs of ultrasonic carriers, thereby producing a modulated signal; and hydrophone means, for receiving said modulated signal from said n channel modulator, and for transmitting same into water; and b) a receiving section comprising: hydrophone means, for receiving a modulated signal from the water, and for conveying the same into an RF circuit; RF circuitry, for amplifying and shaping the received modulated signal, and for conveying the same into serial-to-parallel means; serial-to-parallel means, for receiving shaped data from the RF circuit, and for splitting the same into n parallel channels; n-channel demodulator means, for demodulating said shaped signal conveyed to the demodulator from said RF circuit, and for outputting n channels of digital data; and parallel-to-serial means for receiving n parallel channels of outputted data from the demodulator, and for combining the data into serial data. |
