Abstract: A method and apparatus for using the primordial fear of dolphin of killer whales to separate dolphin from tuna. The sound of killer whale is recorded, digitized, edited and enhanced to produce digitally synthesized killer whale sounds. These digitally synthesized sounds of one or more feeding killer whale is played under water and in the vicinity of a mixed school of dolphin and tuna and as the dolphin leave said vicinity, catching the tuna in nets. A playback unit is selectively triggered on and off from a remote location.

Abstract: Improvements on the Parra "METHOD AND APPARATUS FOR SEPARATING DOLPHIN FROM TUNA" using the primordial fear of dolphin of killer whales to separate dolphin from tuna wherein the sound of feeding killer whale is recorded, digitized, edited and enhanced to produce digitally synthesized killer whale sounds. These digitally synthesized sounds of one or more feeding killer whale is played under water and in the vicinity of a mixed school of dolphin and tuna and as the dolphin leave said vicinity, catching the tuna in nets. According to the present invention, one or more of a plurality of playback units are selectively triggered on and off from a remote location to steer the dolphin to safety. The playback unit is carried in an elongated hollow tube having a weighted end and a recovery end, the weight causing the end it is on to go to a predetermined depth in the sea with the recovery end having a hook for aerial retrieval.

Abstract: A compact, sound activated device for repelling house cats from indoor surfaces and areas. When triggered from a remote location by a sharp audio signal such as that of a human handclap, the device produces a deterrent sound which repels cats from the area or surface upon which the device is placed. The deterrent sound is audible within the normal range of human hearing and terminates automatically after several seconds. The device, comprising a single housing, is battery powered and has external controls for regulating handclap sensitivity, deterrent sound volume level, and current flow from the battery.

Abstract: A relatively simple but highly effective circuit for producing ultrasonic signals which are utilized to repel pests and vermin. The frequency of the signals is sufficiently high to be undetected by humans and most domestic animals and pets.

Abstract: An electronic animal repellant apparatus includes a microphone for detecting environmental sound, a detection circuit for detecting the presence of a particular species of animal in the vicinity of the repellant apparatus, a timing and activation circuit, and a plurality of animal repellant or frightening devices. The microphone produces an input signal fed to the detection circuit that has a frequency content representative of the frequency spectrum of the environmental sound. The input signal is compared to a pre-determined frequency envelope characteristic of the sound spectrum of the particular animal species and a trigger signal is produced when the presence of the particular animal is detected. The detection circuit includes a band-pass filter and a negative feedback band-reject filter, each having readily removable and replaceable components for changing the pre-determined frequency envelope for different species of animal to be repelled.

Abstract: A system and method for developing acoustic underwater stimuli for guiding aquatic animals such as fish, to or from an underwater area. Fish captured from the underwater area are placed in a sound recording chamber and their sounds recorded. The spectrum of the recorded sound is analyzed and is used to vary a primary sound spectrum is accordance with predominate frequencies contained therein to create a sound believed to have the most efficient guidance effect on the fish since the fish are believed to be most responsive to sounds produced by the fish themselves. The captured fish are then placed in a behavior chamber preferably located in the underwater area. The created sound or stimuli is applied to behavior chamber to determine its effect on the fish contained therein and may be modified to arrive at the most effective sound. This sound then is applied to the underwater area and measured to ensure that is has been properly applied.

Abstract: A system and a method for counteracting marine fouling of e.g. a vessel hull (1) are provided.Electro-mechanical vibration transducers (2, 3) are arranged in pairs adjacent to fixed (clamped) nodal lines (4) on said hull (1), and are driven in an inverted phase relationship in order to provide a water particle movement in a hull parallel direction right outside said nodal lines (4) in addition to the hull perpendicular relative movements right outside said transducers (2, 3).The invention also comprises a combination of the mechanical system above and a special surface coating which counteracts fouling from other organisms than those influenced by said water particle movement in the infrafrequency range.

Abstract: Rodents are driven off and kept away from burrows in a subterranean area by driving cylindrical housing containing respective shock wave generators into the ground. The shock wave generators are each designed to produce at timed intervals, damped vibrations which radiate into the surrounding ground.

Abstract: A device for frightening noxious animals by means of ultrasonic signals which includes an electro-acoustic transducer, having elements for electronic oscillation generation controlled by a freely programmable micro computer. The micro computer and the elements for the electronic oscillation generation are so designed that time-varying acoustic signals are randomly generated.

Abstract: A device for modifying the behavior of fish, causing them to swim along a desired path, projects sequences of sound into the water, resulting in sound wave patterns which direct the fish along the desired path. The device includes a fish detector, which detects the monitors the activities of fish, an array of sound projectors and a controller. When fish are detected the controller generates sequences of signals which are applied to the projector array. The projectors project corresponding sounds into the water, producing the sound wave patterns. The detector monitors the activities of the fish and the controller, if necessary, adjusts the sound sequences until the fish are directed along the path. When the detector no longer detects any fish, the controller stops applying signals to the projector array, preventing approaching fish from habituating to the projected sounds.

Abstract: A method for controlling the population of marine and aquatic species in an area of water includes the development of data concerning the response of various species to stimuli in different environmental conditions, and the generation of stimuli in the control area to affect the species in that area and thus control the population. The stimuli are generally sonic waves, but other stimuli such as light, radio waves, and magnetism may also be employed in place thereof or in addition thereto. The system uses a feedback monitor and computer with data concerning species response to adapt the stimuli to changing species and conditions.

Abstract: An animal luring device is set forth wherein a microphone is operatively associated with a recording and play-back mechanism to initially record and then broadcast an animal sound through a selected frequency. The device is operative through an associated photovoltaic cell and circuitry arrangement.

Abstract: A portable electronic flea-repelling collar for domestic animals activated by a self-contained battery comprises a printed circuit board on which are mounted an electrical to ultrasonic transducer, an integrated circuit for deriving periodic electric pulses having relatively low duty cycle and an ultrasonic carrier and leads interconnecting the battery, transducer and integrated circuit. The period, amplitude, duty cycle and carrier frequency of ultrasonic pulses emitted by the transducer in response to electric pulses derived from the integrated circuit repel fleas from the animal. The integrated circuit is sandwiched between the printed circuit board and the transducer. The printed circuit board carries a spring clip that mechanically and electrically contacts a first electrode on a first face of the battery. A second electrode on a second face of the battery is urged by the spring clip against a contact area on the printed circuit board.

Abstract: Predator control sonic collar unit for protecting livestock when placed around the neck, comprising means for detecting startled motion, means for transforming the startled motion into an electrical impulse, and means for converting the electrical impulse into an audio alarm sound and/or visual alarm which repels an attacking predator.

Abstract: For scaring birds, at least two acoustic signals are generated whose frequencies are periodically modulated within a range between about 30 and 9000 Hz, the modulation period ranging between about 0.01 and about 5 seconds. The signals differ in the frequency modulation range, in the modulation period and/or in duration. The signals are emitted either in fixed or in arbitrary sequence.

Abstract: Fleas are repelled from a four-legged animal by compressional waves derived from an electric-compressional wave transducer driven by electronic circuitry powered by a battery. The battery, circuitry and transducer are mounted in a housing carried by a collar around the neck of the animal. The housing includes a first face having an aperture covered by a dust screen. A face of the transducer positioned behind the dust screen radiates compressional wave energy through the dust screen that is reflected from the ground beneath the animal back to the underneath portions of the animal. The duty cycle and frequency of ultrasonic pulses derived by the transducer cause the fleas to be repelled. A second face, opposite from the first face, abuts against the body of the animal and carries a frangible, spring-like plate having a pair of slots through which the collar extends.

Abstract: A low duty cycle relaxation oscillator periodically gates an ultrasonic frequency relaxation oscillator into an on state. The ultrasonic frequency oscillations are supplied to an electric-compressional wave transducer by way of a push-pull driver. The duty cycle and repetition rate of the relaxation oscillator and the ultrasonic oscillation frequency are such that compressional waves derived by the transducer incident on fleas in the region where the transducer is located repels the fleas. All active elements in the oscillator and driver are CMOS devices which draw only leakage current while in quiescent bi-level states and through current from a battery during transitions between the bi-level states. The drain from the battery is reduced by connecting a high impedance between the battery and the CMOS devices during a relaxation oscillator transition.

Abstract: A portable animal control unit includes circuitry incorporated in a miniature housing for generating an animal influencing modulated soundwave in the ultrasonic frequency range. A first oscillator produces an output signal for driving an ultrasonic transducer, the output signal having a center frequency in the ultrasonic range. A second oscillator produces an output control signal for modulating the frequency of the first oscillator, the modulation rate being determined by the center frequency of the second oscillator output signal and the amount of deviation of the second oscillator from the center frequency.

Abstract: Pests, such as fleas and ticks, are repelled from domestic animals, such as dogs and cats, by attaching an ultrasonic compressional wave energy source to the animal in such a position that a beam of the compressional wave energy is directed downwardly toward a surface on which the animal is located. Energy in the beam is reflected from the surface back to the animal. The energy has sufficient intensity, as reflected back to and incident on the animal, to repel the pests. The energy is pulsed on and off at a relatively low duty cycle at a rate above a predetermined minimum, such that during each pulse the envelope amplitude varies.

Abstract: A device for repelling animals is disclosed which is adapted for use with refuse and garbage containers to discourage entry therein by foraging animals. The device comprises:(a) a detector for remote-sensing the presence of an animal within its vicinity;(b) an ultrasonic sound generator for producing an animal-repelling ultrasonic sound wave; and(c) means for temporarily activating the ultrasonic sound generator when the detector has sensed the presence of an animal within its vicinity.

Abstract: An acoustic device for eliciting either attraction or repulsion behavioral responses in fish comprises a water tight enclosure having a radiating surface rigidly supported in one end thereof. Drive means for the radiating surface are provided with the capability of causing the radiating surface to vibrate at its resonant frequencies so that an acoustic signal is generated capable of a peak sound pressure level of at least 0.5 kPa (0 to peak) at a distance of 3 meters from the radiating surface. The signal generated has one fundamental frequency component in the range 20 to 1000 Hz and a plurality of resonant and harmonic frequencies associated with said fundamental frequency. The drive means, radiating surface and enclosure coact to generate an acoustic signal having characteristics such as resonant frequencies, peak pressures and temporal patterns which may be selectively optimized to produce the desired behavioral response.

Abstract: Ultrasonic pest control apparatus comprising an elongated housing having opposite ends, a sound generator carried by the housing adjacent one end thereof and including at least one transducer for providing output sound waves when driven by an electrical signal, the sound waves being directed outwardly from the end of the housing and having a frequency normally inaudible to humans and intolerable by pests such as rodents and the like, and an electrical connector element at the other end of the housing adapted to be inserted manually into a standard electrical outlet receptacle commonly found in buildings and the like. The connector can be of the prong type or of the threaded type commonly found on the base of electric lamps. The transducer preferably is driven in a manner such that the generated sound waves are a composite output in the form of a random pattern of harmonies.

Abstract: A high intensity ultrasonic sound generator for producing bursts of ultrasonic frequency and a method of controlling vermin and pests by projecting such bursts into a space from which such vermin and pests are desired to be eradicated. The apparatus has a transformerless power supply employing a voltage divider with a low leakage input capacitor and an output capacitor having a significantly larger capacitance than that of the input capacitor, and wherein the load is voltage dependent so that the greater the charge on the output capacitor, the greater the load and, therefore, the output capacitor is prevented from excessively charging. Ultrasound frequency is generated by two astable multivibrators one of which duty cycles the other and means are provided to vary the frequency within each burst and the burst interval.

Abstract: A method of and system for threatening noxious animals and insects or pests such as rats or mice, pigeons, cockroaches and the like in an area by sonifying the area with an ultrasonic energy. An electrical signal which randomly fluctuates in frequency in a certain range on a central frequency and contains an impacting part changing sharply in frequency from rapid drop to rapid rise is prepared and emitted from a transducer as mechanical ultrasonic oscillation.

Abstract: Apparatus for use as an ultrasonic pest repeller capable of having three different modes of operation for the purpose of generating ultrasonic signals for use in repelling all types of pests. The apparatus includes a circuit coupled at its output with one or more ultrasonic transducers and the circuit operates to generate electronic signals which are applied to the transducer or transducers for creating the ultrasonic signals in any one of three different modes of operation including a first mode in which a steady, modulated signal is generated, a second mode in which a dual pulse signal is generated with modulation of each pulse, and a third mode in which a signal is swept over a band of frequencies and is modulated simultaneously with the sweeping action. The circuit includes a rectifier for providing a DC regulated voltage.

Abstract: A device for generating and radiating ultrasonic sound waves for the control of pests such as rodents, insects and the like comprising a housing having at least two surface portions, an electrically operated sound generator carried by the housing associated with one of the housing surface portions for providing output sound waves directed outwardly from the one surface portion of the housing and in an ultrasonic frequency range normally inaudible to humans and intolerable by pests such as rodents, insects and the like, and a pair of spaced-apart prongs of electrically conducting material extending from the other of the housing surface portions and connected electrically to the sound generator and adapted for insertion manually into the socket of a standard electrical outlet receptacle commonly found in buildings and the like for supplying electricity to the sound generator and simultaneously supporting and holding the device.

Abstract: An acoustic vermin-repellent device comprises a trumpet-shaped main body, a first bowl-shaped reflection plate disposed in the vicinity of the small diameter end portion within the main body, a second bowl-shaped reflection plate disposed in the vicinity of the large diameter end portion within the main body so as to have its concave surface opposed to the concave surface of the first reflection plate, an acoustic generator attached to the concave surface of the second reflection plate so as to be directed to the concave surface of the first reflection plate, actuating means for causing the acoustic generator to fulfill its function, and a plurality of outlets formed around the second reflection plate for emitting out of the main body acoustic waves to be generated by the acoustic generator.

Abstract: A device which repels rodents by generating sound waves at a frequency offensive to rats and mice. The sound waves are generated by coils that are alternately energized and deenergized by a solid state control circuit. The circuitry includes two timing circuits which establish a three minute operating cycle during which the coils are energized at the desired 60 cycle per minute frequency for two minutes and are inactive for one minute. The sound waves are transmitted through the ground line of the electrical wiring system of a building, directly through the ground for control of below ground rodents, or through the building itself in the case of a wall mounted unit.

Abstract: Ultrasonic pest control apparatus comprising an elongated housing having opposite ends, a sound generator carried by the housing adjacent one end thereof and including at least one transducer for providing output sound waves when driven by an electrical signal, the sound waves being directed outwardly from the end of the housing and having a frequency normally inaudible to humans and intolerable by pests such as rodents and the like, and an electrical connector element at the other end of the housing adapted to be inserted manually into a standard electrical outlet receptacle commonly found in buildings and the like. The connector can be of the prong type or of the threaded type commonly found on the base of electric lamps. The transducer preferably is driven in a manner such that the generated sound waves are a composite output in the form of a random pattern of harmonies.

Abstract: A security device incorporates apparatus for producing a special alarm sound in response to a change in acceleration sensed with a special omnidirectional sensor and under the control of special SCR circuitry. The circuitry and sensor are especially adapted for the security application but have independent utility. The alarm generates two tones in the middle audio range, separated by 50 to 200 Hz. One of those tones is interrupted at a sub-audible rate of 3 to 8 Hz. The resulting alarm, at high volume levels, is of enhanced urgency, compelling a hearer to escape, the compulsion being of a degree not easily overcome by reason.

Abstract: A ground inserted rod supports at its upper end a base having a cup-shaped member in which is loosely received a motor housing. During motor operation an eccentric blade imparts random movement to the motor housing to cause same to impact the cup-shaped member to impart vibratory movement to the ground inserted rod for wave generation. A battery holder provides a self-contained power source such as a low voltage dry cell battery.

Abstract: A system for transmitting a parametrically pumped sonic signal through a transmission medium to a remote location is disclosed. The preferred system, which is particularly intended for use as a sonic weapon, comprises a sound source; means for separating the sound into a plurality of discrete frequency components including a fundamental component and at least one additional component, each additional component having a frequency twice that of the next lowest frequency component; means for adjusting the phase difference between each frequency component and the next lowest frequency component to substantially 90.degree.; means for colinearly focusing the components on the remote location; and means for rendering the transmission medium nonlinear between the focusing means and the remote location.

Abstract: Electromechanical apparatus producing random ultrasonic noise is disclosed for killing insects. A number of coils are provided, each having primary and secondary windings which are wrapped around a metal core. The windings are electrically interconnected to each other and to a power source. The current through the windings is controlled by a number of digital signals having random pulses and random intervals between pulses. The random pulses rapidly turn the current through the windings on and off. This causes the metal cores to vibrate extremely randomly thereby producing random noise.

Abstract: An energy-pulsating rodent-repelling device designed to discourage rodents, especially of the burrowing type, from inhabiting a general area above and below the ground surface within the vicinity of the operating device which includes a plurality of electrically energized coils mounted to a single probe which is inserted into the ground surface area known to be inhabited by the animals, whereby the coils are randomly energized in an inconsistent manner provided by a plurality of switches which create an irregular flow of sonic waves and physical vibrations that are imparted and transferred throughout the general surface and subsurface ground area, thereby causing a disturbing effect upon the rodents and encouraging them to leave the affected area without direct physical harm to them.

Abstract: Ultrasonic pest control apparatus comprising a pair of transducers, one in the form of a ring and the other in the form of a disc positioned within the ring, carried by a housing, a pair of oscillators operatively connected to the transducers, a timer controlling the oscillators, and a reflector extending from the housing. The oscillators apply to the transducers electrical signals having frequencies different from the natural frequencies of the transducers, and the timer controls the oscillator duty cycle. The generated sound waves are a composite output in the form of a random pattern of harmonics in the ultrasonic frequency range noramlly inaudible to humans and intolerable by pests such as rodents. A system includes a pair of units in opposed alignment whereby sound waves of one unit work against sound waves of the other. A gas-tight sealing arrangement associated with transducer and housing permits safe operation in explosive atmospheres.