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JPS57191579A |
PURPOSE: To cnsiderably reduce the influence of noise, to easily change sensing range, and to simplify the constitution of a device by providing a preamplifier on a transmitter and receiver side by utilizing a level switch and a capacito...
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JPS57190410A |
PURPOSE: To reduce the calorific value of sound and photo-couplers and to achieve precise coupling by insulating input and output sides of a digital electronic circuit through the sound and photo-couplers. CONSTITUTION: When a signal is ...
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JPS57174951A |
An electroacoustic transducer apparatus which prevents oscillations as a result of acoustic coupling between an acoustic-wave transmitter and a receiver. The transmitter and receiver each comprise an electro-acoustic transducer network. ...
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JPS5750099B2 |
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JPS5748080Y2 |
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JPS57162636U |
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JPS57160078A |
Problems of resolution and focussing arise in the near field in systems employing radiation, including ultrasonic systems. These problems can be alleviated by suppressing the plane waves in the combination of plane waves and edge waves u...
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JPS57158575A |
PURPOSE: To clearly indicate a working limit of a battery by a simple constitution, by periodically intermitting the recording of a receiving recorder, when a battery voltage detecting circuit of a detecting transmitter has dropped to a ...
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JPS57156749A |
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JPS57152245A |
PURPOSE: To disconnect a weight from a body dipped in water by an ultrasonic wave by throwing into water an ultrasonic-wave signal transmitter constituted of an ultrasonic wave transmitter driven with an oscillating circuit, and a batter...
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JPS57143746U |
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JPS57134523U |
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JPS57501358A |
An ultrasonic communication system capable of wireless installation and supervised operation is achieved by communicating each information bit as two distinct ultrasonic frequencies separated in frequency enough to assure that the signal...
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JPS57121343A |
PURPOSE: To remove restrictions due to the change of the resonance frequency of ultrasonic waves on materials of an oscillator, by switching the value of the coil in an ultrasonic wave transmitting and receiving circuit by a switch. CONS...
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JPS57120826A |
PURPOSE: To easily detect an ultrasonic driving pulse voltage by determining the electric current flowing from the voltage across the diodes of amplitude limiters. CONSTITUTION: The respective oscillators of an oscillator array 6 corresp...
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JPS57111481A |
PURPOSE: To prevent a sonar transmitter from being broken down due to cavitation by detecting the pitching angle of a ship and by inhibiting the transmission of an ultrasonic wave when the pitching angle is an angle of depression to the ...
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JPS5731717B2 |
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JPS57107643A |
PURPOSE: To avoid distance limit for a diver, by the communication of ultrasonic waves between the diver and a relay device and electromagnetic waves between the relay device and a person on land through the provision of the relay device...
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JPS5794256U |
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JPS5726450Y2 |
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JPS5778146U |
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JPS5776464A |
PURPOSE: To reduce electric power consumption by performing transmission to remote places only for a specified period of time after the transmission of underwater searching pulses, and performing transmission to remote places when search...
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JPS5776690A |
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JPS5775035A |
PURPOSE: To use the same transfer means to transfer more information, by providing a means which uses already provided cables and carrier waves to transmit and receive not only information due to the audible sound but also information du...
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JPS5721401Y2 |
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JPS5766271U |
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JPS5763796U |
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JPS5760853U |
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JPS5743681U |
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JPS5743646U |
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JPS5710621B1 |
An ultrasonic tracking and locating system in which an identification code number is programmed on a console keyboard to activate an encoder which transmits a plurality of coded pulses to a plurality of transceiver units located in the r...
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JPS5722064U |
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JPS56174275U |
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JPS5654693Y2 |
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JPS56151985U |
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JPS56145154U |
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JPS56135168A |
It is the aim of the exemplary disclosure to create a simple system with as great a variability as possible wherein a pulse generator for each ultrasonic transducer element comprises a digital frequency control member for controlling the...
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JPS56132851U |
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JPS56118198U |
A novel system for detecting frogman accidents is disclosed. The system comprises an electronic sending system which emits an regualar acoustical signal, provided that the submerged frogman periodicaly actuates a lever and a receiving sy...
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JPS56114178U |
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JPS5637872B2 |
A transmission cable for use with an ultrasonic device such as an ultrasonic machining device is provided. The transmission cable of the present invention comprises a plurality of fine metallic wires coupled between the output terminal o...
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JPS56113400U |
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JPS56108676U |
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JPS56105199U |
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JPS5699953U |
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JPS5693100U |
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JPS5683844U |
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JPS5679543A |
The underwater signalling and identification device comprises an emitter (5) having four submerged transducers (10 to 13) arranged to form a square and fitted in a water-tight case (25) placed above an opening (7) formed in the hull of a...
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JPS5676067A |
PURPOSE: To enable the control of correct delay time and a beam focusing without deterioration a combined performance of the circuit by a constitution wherein an appropriate delay time is added to each of multiultrasonic receiving signal...
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JPS5651660A |
The signal processing method is esp. for echo signals arising in ultrasonic fissure fault testing of materials. An analogue test signal from a detector is amplified in a linear preamplifier. After this amplification the test signal is di...
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