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159 results about "Source level" patented technology

Source level. The sound intensity, in decibels above a reference level, at a point which is a unit distance from a source and on an axis of the source.

Methods of and systems for continually measuring the range between mobile underwater vehicles carrying acoustical signal transmitters and remotely deployed synchronized underwater acoustical receivers provided with signal processing for continually determining such range during the underwater moving of the vehicle, and for measuring acoustic underwater transmission loss, geoacoustical properties and for other purposes

Invention relates to a novel method of and system for ranging between an acoustic source carried on an unmanned or autonomous undersea mobile vehicle (UUV or AUV) and preferably a plurality of hydrophone receivers remotely deployed from the vehicle in predetermined patterns, generally suspended from sonobuoys equipped with above-the-sea relay radio transmitting antennas, and with time synchronization provided amongst the source and the receivers, wherein the time delay from the transmissions of the source is measured by utilizing special signal processing, enabling range to be measured in close to real time by determining the product of the sound velocity and the measured time delay, and with the process continually and periodically being repeated throughout the duration of the vehicle run. Given the range, the system may then be used to measure the acoustical properties of and/or receiver system performance in the sea or other water body, such as transmission or propagation loss TL, channel impulse response, bottom geoacoustic properties, source level, receiver sensitivity calibration, sonar operator readiness and sonar receiver performance and the like. Further, in situ measured data can be assimilated with models to enable more accurate prediction of the ocean environment than could be obtained from either individually.
Owner:OCEAN ACOUSTICAL SERVICES ADN INSTR SYST OASIS INC

Demodulator circuit for the UHF (Ultrahigh Frequency) radio frequency identification label chip

The invention discloses a demodulator circuit for a UHF (Ultrahigh Frequency) radio frequency identification label chip. Aiming at the defect of smaller dynamic range brought by the substitution of a traditional grid-grounded MOS (Metal-Oxide Semiconductor) tube for a high-resistance resistor, the invention provides a demodulator circuit which comprises an overvoltage protection circuit and a mean value generating circuit. The demodulator circuit connects the grid of a first PMOS (P-Channel Metal Oxide Semiconductor) tube in the mean value generating circuit with the grid of a first NMOS (N-Channel Metal Oxide Semiconductor) tube in the overvoltage protection circuit, and the grid level of the first PMOS tube automatically varies with the source level thereof by the partial pressure action of a second PMOS tube and a second resistor when the source level of the first PMOS tube rises or falls so that the absolute values of a grid voltage and a source voltage of the first PMOS tube are kept stable, the first PMOS tube has stable equivalent resistance in a large dynamic range, and the demodulator circuit of the invention has greater dynamic input range compared with the traditional demodulator circuit.
Owner:四川电子科技大学教育发展基金会

Acoustic performance measurement method of underwater transmitting acoustic transducer under high hydrostatic pressure

The invention relates to the field of underwater acoustic transducer measurement and in particular belongs to the range of acoustic parameter measurement of an underwater acoustic transducer under thehigh hydrostatic pressure so that an accurate measurement realization problem of the acoustic parameters of an underwater acoustic transducer under the high hydrostatic pressure can be solved. In order to overcome defects in measurement using the hydrophone, the invention puts forward an acoustic performance measurement method of an underwater transmitting acoustic transducer under a high hydrostatic pressure. According to the method provided by the invention, in a light-transmitting pressure water tank, measurement is carried out by using an optical method to obtain a particle vibration velocity value of a specific position in a far field of a radiation sound field of the transducer; calculation is carried out to obtain a sound pressure measurement value at the position; and then acoustic parameters like a sending voltage response level and an acoustic source level of the underwater acoustic transducer under the high hydrostatic pressure are obtained. With the method provided by theinvention, no standard hydrophone or measurement hydrophone is needed; and because the method is a non-contact measurement method, no disturbance is caused on the sound field.
Owner:THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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