Abstract:
본 발명은 수중의 두 지점에서 수신되는 음파 신호를 헤드폰과 같은 스테레오 채널을 통해 수중 환경 그대로 재생할 수 있도록 하기 위한 스테레오 수중 음향신호의 공기 중 재현을 위한 신호처리방법 및 이를 이용한 신호처리장치에 관한 것으로, 본 발명에 따르면, 수중의 음향을 물 밖에서도 동일하게 느낄 수 있도록 하기 위해 수중 음향신호를 공기 중에서 그대로 재현하는 기술내용에 대하여는 제시된 바 없었던 종래의 수중 음향신호 처리방법들의 문제점을 해결하여, 수중에서 존재하는 음원의 입사각을 숫자나 그래프로 확인하지 않고 공기 중에서 청취하여 추정함으로써, 수중 작업시 선상에서 수중의 소리를 듣고 수중 소음원의 위치를 용이하게 파악할 수 있도록 구성되어 수중 소음원의 위치파악 및 인식능력을 높일 수 있는 동시에, 원격제� �� 무인잠수정(ROV) 등과 같은 원격 제어로봇을 이용한 수중 작업시 작업 효율을 증대시킬 수 있으며, 유인 잠수정이나 잠수함 등에 적용하여 잠수정이나 잠수함 내부에서 용이하게 수중 소음원의 위치를 파악할 수 있는 스테레오 수중 음향신호의 공기 중 재현을 위한 신호처리방법 및 이를 이용한 신호처리장치가 제공된다.
Abstract:
PURPOSE: An underwater supersonic camera for a precise underwater survey and an operation method thereof are provided to use low frequency and high frequency in the underwater survey in order to supplement shortcomings and add-on the advantages. CONSTITUTION: An underwater supersonic camera for a precise underwater survey which has two operating frequencies is comprised of the followings: a high frequency generator(21) generating an electricity signal; a high frequency power amplifier(22) amplifying the electric power of the electricity signal; a high frequency sending sound transducer(23) which generates a high frequency sound wave by using the amplified electricity signal; a high frequency receiving sound transducer(24) receiving the high frequency sound wave which has been being reflected by underwater object and generates the electricity signal; a high frequency low noise amplifier(25) amplifying a weak electricity signal; a high frequency low noise amplifier which selects and filters only the high frequency area in which will be provided to a high frequency signal collector(28) among the electricity signal; a high frequency time-variable amplifier(27) which changes an amplification ratio according to time in order to make the amplification ratio of a short distance signal small and the amplification ratio of a long distance signal huge; the high frequency signal collector forming the data in which is able to be processed by sampling the electric signal; a signal processor(30) performing the beam forming process by using the collected data; and an ultrasonic image display apparatus(40) displaying the ultrasonic image. [Reference numerals] (11) Low frequency signal generator; (12) Low frequency power amplifier; (13) Low frequency sending transducer; (14) Low frequency receiving transducer; (15) Low frequency low noise filter; (16) Low frequency band pass filter; (17) Low frequency time-variable amplifier; (18) Low frequency signal collector; (22) High frequency power amplifier; (23) High frequency sending transducer; (24) High frequency receiving transducer; (25) High frequency low noise amplifier; (26) High frequency band pass filter; (27) High frequency time-variable amplifier; (28) High frequency signal collector; (30) Signal processor; (40) Ultrasonic image display apparatus; (AA) High frequency signal generator
Abstract:
PURPOSE: An apparatus and method for transmitting additional information in a preamble in a packet data communication using differential modulation are provided to increase a data transfer rate by rotating the preamble, which is predetermined according to the classification of a packet, by phase. CONSTITUTION: A phase rotator(110) outputs a phase rotation amount corresponding to additional information to be applied to a transmission target packet. A transmission multiplier(120) multiples a phase rotation amount, which is outputted from the phase rotator, and the preamble to be transmitted. A symbol mapper(130) converts a header and payload data to be applied to the transmission target packet into a symbol. A multiplexer(140) selectively outputs an output signal of the transmission multiplier and an output signal of the symbol mapper through an output terminal. A differential symbol converter(150) converts a symbol string outputted from the multiplexer using preset differential modulation. [Reference numerals] (110) Phase rotator; (130) Symbol mapper; (140) Multiplexer; (150) Differential symbol converter; (AA) Preamble symbol row; (BB) Packet additional information; (CC) Header and payload