Matches 1 - 50 out of 105 1 2 3 >
Match Document Document Title
7091832 Acoustic detection of machinery malfunction  
A sound variation indication apparatus includes a comparison element, an interval checker, and an indication generator. The comparison element receives an audio signal and compares it to a check...
7006641 Driving circuit, electro-mechanical-acoustic transducer, and portable terminal apparatus  
A circuit of the present invention is a driving circuit for driving a vibrator having a mechanical vibration system which resonates at a resonance frequency. The driving circuit outputs to the...
6885295 Reversing alarm  
A reversing alarm for a vehicle emits an audible signal in the form of pulses of broad band sound when the vehicle is put into reverse gear. The broad band sound allows persons in the vicinity to...
6788188 Multi-function electronic horn warning system  
A multi-function electronic warning horn system comprises a couple of horns ( 1, 2 ) and a microprocessor ( 6 ), integrated in an electronic module ( 16 ) comprising a voltage adjuster ( 13 ), an...
6701094 Battery-powered IR transmitter having constant power output  
In a battery operated IR transmitter having at least one IR LED energized by a source of voltage for passing current during transmission of pulses of data, the IR transmitter includes an energy...
6686833 Compound acoustic actuator drive circuit and portable information terminal  
In a signal generation circuit for a compound acoustic actuator that generates a sound and a vibration in response to a frequency of a signal input to the compound acoustic actuator, the signal...
6559758 Multi-tone warning sounder  
A sounder device includes a piezoelectric resonant transducer, an amplifier and a coupling transformer to drive the transducer, an electronic signal produced to provide an input signal to the...
6396402 Method for detecting, recording and deterring the tapping and excavating activities of woodpeckers  
An apparatus for deterring woodpeckers from tapping on and excavating within a utility pole or the like includes a housing having mounting flanges for direct attachment to the pole so as to receive...
6359549 Electronic sound generator with enhanced sound  
A sound generator includes a memory bank storing user-selectable recorded sounds, a microprocessor that can quasi-randomly time-delay at least one of the recorded sounds, and a mixer that can...
6255937 Notifying device using alternating drive signals  
A notifying device adapted to give notification with both sound and vibration includes a notifying unit 2 which comprises a first vibrator drivable at an audio-frequency with a first drive signal...
6211774 Electronic horn and method for mimicking a multi-frequency tone  
An electronic horn for mimicking a multi-frequency tone includes a wave signal generator for generating an input signal and a complex signal generator for generating a complex signal across a...
6198405 Driver circuit and method of operating the same  
A driver circuit 1000 for driving functional devices, such as an LED 1020-1023, a buzzer 1060, a voltage converter or an EL-lamp, and a method of operating the driver circuit are provided. The...
6160245 Variable volume signaling device for an appliance  
An appliance is provided with a feedback system which audibly signals both the activation of user input controls and when the appliance reaches a certain operational stage. The system functions to...
5939992 Safety apparatus for electric appliances  
A safety apparatus for electric appliances which includes a sensor for sensing that an electric appliance is operating. An alarm coupled with the sensor, whereby an alarm is initiated. A manually...
5818328 Method and system for providing improved wireless audio transmission  
A method and system for providing improved confined area audio amplification is provided. Designed to meet the requirements of classrooms, conference rooms and offices, this new invention provides...
5726634 Smoke alarm with high and low pitched tones  
A smoke alarm with high and low pitched tones including a conventional smoke detector adapted to activate upon the detection of smoke associated with fire. A first high tone buzzer is included for...
5714926 Method and means for preventing trespassing  
Method and means for preventing trespassing and/or unauthorized staying in an area outdoors or indoors, e.g. in a building, part of a building, in vehicles, vessels, etc., sound signals with...
5675312 Piezoelectric warbler  
An electronic audio circuit operates a piezoelectric audio transducer to produce a two-tone warbling audio output. The electronic circuit includes an integrated circuit double timer and integrated...
5675311 Frequency sweeping audio signal device  
An audio signal is generated that sweeps from a lower frequency to a higher frequency in a substantially linear function. The circuit used to produce this sweeping audio frequency has a stable...
5619179 Method and apparatus for enhancing electronically generated sound  
A sound generator includes independent and identical generators for the left and right sound channels. In one embodiment, identical sound synthesizer ICs contain the same library of sound loops. By...
5416463 Method and apparatus for producing a sound from a handheld enclosure  
A portable electronic bar code reader having an improved mechanism for producing sounds. The mechanism includes two piezoelectric disks, each positioned in a separate Helmholtz resonator tuned to a...
5175528 Double oscillator battery powered flashing superluminescent light emitting diode safety warning light  
A flashing safety warning light in which a superluminescent light-emitting diode (SLD) light source is driven by an oscillatory drive signal at a visually imperceptible but highly efficient...
5084695 Umpire's counter  
An umpire's counter is provided with a housing having a top face and a bottom face. On the side of the housing between the faces, inputs for advancing a balls display, a strikes display, an outs...
5012221 Emergency vehicle audible warning system and method  
An emergency vehicle audible warning system and method for improving emergency vehicle mission effectiveness and reducing the undesirable side effects of emergency vehicle audible warning systems....
4949068 Motorcycle sound simulator for a child's toy  
A device for simulating the sound of a motorcycle as a child's toy in which the simulated sound is composed of at least two rectangular waves partially out of phase with each other, mixed and...
4812746 Method of using a waveform to sound pattern converter  
A method of using a waveform to sound pattern converter that produces an audible image of a time dependent signal by digitizing the signal to produce a plurality of discrete level signals, and...
4719452 Audio signal generator  
Audio frequency signal generator to generate signals in a selected band of audio frequencies to generate a noise having an amplitude pattern which simulates the noise generated by a selected...
4689609 Electronic horn with spiral deflecting walls coupled to a truncated cone structure  
An electronic horn of compact dimensions. Oscillator circuits coupled to a mixing node produce a multiple frequency signal used to drive a horn transducer. One horn replaces the two horns used in...
4665383 Security system with monitoring and warning circuits  
A central protection system suitable for the protection of a building from fire and other hazards includes a set of environmental sensors and circuitry for interrogating the sensors. The system...
4646063 Electronic siren with remote multiplexed control head  
The invention is a control apparatus for use in an electronic siren circuit which generates a plurality of siren and intelligible audio outputs. The control apparatus includes a control module of...
4631517 Frequency-matched signal device for persons with impaired hearing  
A frequency-matched signal device for persons with impaired hearing, including an activating member (1,2,3), a signal generator (4) activated thereby for producing an electrical signal with a...
4626799 Warble signaling device  
There are three oscillator circuits which oscillate at different frequencies, each oscillator circuit including a gate having an input and an output. The output of the first gate is connected to an...
4567806 Sound generator  
The sound generator applies an envelope to the note signal. Current to the sound producing element is controlled by a series transistor whose base is driven with a signal having a frequency...
4558305 Multiple tone signaling device  
A multiple tone signaling device provides a piezoelectric transducer, first, second and third oscillator circuits, a first input terminal for enabling either or both of the first and second...
4554411 Intercom system  
A communication system includes a master control with optional inside, door or patio remote units, door chime, phone coupler, or programming such as radio, phonograph, tape player or the like. The...
4516113 Digital tone generator for tone sequences  
Semiconductor circuits for the automatic generation of tone sequences of different tones. A bistable switch having a control input activated by start signal controls a voltage stabilizing circuit...
4488145 Resonant sounder device for producing multiple warning sounds  
The present invention produces at least two sound signals such as warning signals or actuating signals by one sounder having a resonant frequency, wherein one of the sound signals is indicated by...
4486742 Multifrequency piezoelectric horn system  
A multifrequency piezoelectric sound-generating system is provided with a piezoelectric vibrator for generating audible sound at two or more resonance frequencies, an oscillator circuit connected...
4473821 Personal acoustic alarm system  
The personal acoustic alarm unit produces an audible alarm signal in the audio range to alert persons in the area of the signal transmitter. This audio alarm signal is formed by a plurality of...
4437088 Electrical simulation of percussive bell  
An electronic circuit for simulating the sound of a percussive bell struck at a predetermined repetition rate. A realistic electronically generated sound is produced by appropriately modulating two...
4421952 Multi-frequency busy signal synthesizing circuitry  
Circuitry for synthesizing a busy or reorder tone comprised of a first tone having a frequency of 770 Hz and a second tone having a frequency of 1150 Hz is described. The inventive synthesizing...
4401975 Electrical synthesis of mechanical bell  
Circuit means for synthesizing the sound of a mechanical bell by combining the three most significant frequencies of the bell to be synthesized and modulating these with a decaying exponential...
4363028 Electronic siren  
An electronic siren-public address system with remote control capability. The siren-public address system employs a push-pull power amplifier wherein the output transistors are driven into...
4338593 Rodent control apparatus and method  
Apparatus and method for producing ultrasonic sound waves used to disperse rodents including negative feedback damping of a tuned band-pass filter output circuit. An electrical signal is frequency...
4337460 Hand-held sound effects device  
A hand-held electronic sound generator, comprising a one or more oscillators and a noise generator, each acting singly, mixed or gated in combination to produce a variety of interesting sounds. The...
4303908 Electronic sounder  
An electronic sounder employs a pair of piezoelectric oscillators tuned to different frequencies to provide loud raucous sound. The sounder is especially suited for providing audible indications of...
4293851 Sound actuator  
A horn and actuator circuit particularly useful in connection with selective actuation of a horn located onboard a model railroad train as the train transverses a selected section of track wherein...
4287510 Electronic signal generator with periodically varying frequency  
An astable multivibrator with an R/C coupling network establishing a nominal operating frequency in the KHz range works into a chain of binary divider stages stepping down that frequency to the...
4284845 Pest eliminator  
A device for freeing an area of birds, insects, or other pests which simultaneously emits two separate audio frequencies which are shifted periodically. The device comprises two separate...
4263665 Ultrasonic intrusion alarm system  
An intrusion alarm system for use such as in homes including an ultrasonic motion detector having means for selectively actuating switch means for a light and a sound alarm. The circuit includes a...
Matches 1 - 50 out of 105 1 2 3 >