Did You Know...
...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 4527153 | Detectable element and sensor A detectable element is attached to an object for detecting the presence or passage of the object and comprises a capsule and a permanent magnet rotatably and vibratably mounted in the capsule. When the detectable element enters an alternating magnetic fi... | 07/02/1985 |
| 4520503 | Tone discrimination circuit A tone discrimination circuit for use with audible smoke or fire detectors or similar audible devices, which automatically emits an output electronic alarm signal, for notification of persons at remote locations, upon input of a proper audio tone from the... | 05/28/1985 |
| 4511917 | Determining agreement between an analysis signal and at least one reference signal A method and apparatus for determining concordance between an analysis signal with at least one reference signal. The smoothed signals or envelopes are formed of a signal which is to be examined and at least one reference signal. A pulse train is generate... | 04/16/1985 |
| 4509189 | Sound level indicating devices A sound level indicating device specifically designed for use by educators to use in teaching students the art of self-discipline when students are arranged in large groups in a large area with means for: (1) detecting noise; (2) distinguishing between no... | 04/02/1985 |
| 4506379 | Method and system for discriminating human voice signal Audible entertainment signals are also filtered to detect speech presence whereby only frequencies in the band 0-150 Hz, are applied to vibrate a listener's chair for special effects.... | 03/19/1985 |
| 4492107 | Acoustic power meter There is disclosed herein an acoustic or ultrasonic power meter which includes a liquid crystal cell for detecting acoustic energy and a control circuit for applying an electric field to said cell. The liquid crystal cell includes a liquid crystal materia... | 01/08/1985 |
| 4481504 | Sound level alarm which ignores transient sounds A sound level alarm device sequentially listens to the sound level of an enclosure or area for a first predetermined interval of time, and thereafter does not listen to the sound level of the area for another predetermined interval of time. The circuit so... | 11/06/1984 |
| 4479115 | Fan speed and/or fan failure detector A pressure transducer, such as a microphone, is placed in proximity to the blades of a fan, such as a fan used to cool electronic equipment. As each blade passes the transducer, a pressure wave is generated that is converted into an electrical pulse by th... | 10/23/1984 |
| 4476724 | Audiometer An audiometer which can be battery operated, is reliable and economical in current consumption has a digital control unit (10) which controls a LCD in matric form (11, 26). The digital control unit, in its simplest form, includes a data input stage (12) h... | 10/16/1984 |
| 4475232 | Fireman's safety apparatus The disclosure is directed to a steady state signal noise eliminator generally used with fire-fighting equipment including a pair of capacitance and resistance circuits series connected to the input having output signals representative of noise that is ph... | 10/02/1984 |
| 4472833 | Speech aiding by indicating speech rate is excessive Apparatus and method for aiding speech wherein a signal is provided, representative of detected speech, and is monitored to determine if the speech rate exceeds a predetermined value. If so, then an indication is provided to the speaker. The speech detect... | 09/18/1984 |
| 4464119 | Method and device for correcting speech A method of correcting the speech of a person affected by stammering comprises applying to the hearing organ of the person through an audio signal transmission channel his own speech delayed in time. The application of the speech is carried out in a frequ... | 08/07/1984 |
| 4461025 | Automatic background noise suppressor A circuit for suppressing background noise of a continuous nature while enhancing speech signals, or signals having the transient temporal qualities of speech, includes a signal multiplier which, in the preferred embodiment, receives the composite audio s... | 07/17/1984 |
| 4424511 | Noise monitor A noise level monitoring and indicating system includes plural microphones distributed about a classroom, bus, etc. and adapted to drive individual counters to indicate the number of times a minimum sound level has been exceeded by the signal from the ass... | 01/03/1984 |
| 4358738 | Signal presence determination method for use in a contaminated medium A signal presence detection method for use in systems where a multiplicity of types of noise is expected, wherein the spectral characteristics of the input wave is compared with corresponding characteristics of the expected noise wave and wherein the dete... | 11/09/1982 |
| 4346374 | Classroom noise alarm A noise alarm for use in a school classroom to detect sound exceeding a predetermined level and which actuates a two-tone audio alarm and a light-emitting diode to notify both the instructor and students when excessive noise has been detected. The noise a... | 08/24/1982 |
| 4319081 | Sound level monitoring apparatus Sound level monitoring apparatus for a deaf person comprises a microphone, a discriminator connected to the microphone to provide an output signal in response to the attainment of a predetermined sound level threshold in the ambient sound detected by the ... | 03/09/1982 |
| 4267561 | Color video display for audio signals Apparatus for producing a video display on a television receiver or equivalent from two channels of audio. The audio channels are fed through two banks of audio filters to separate the audio into descrete frequency bands. In the preferred embodiment, sixt... | 05/12/1981 |
| 4245136 | Monitor ampliphones An improved quadraphonic headphone arrangement in which a first audio signal is coupled to a speaker in each headphone and a second audio signal, usually monaural, is coupled to an amplifier and then to a second speaker in each headphone. Switching means ... | 01/13/1981 |
| 4195310 | Kinescope drive system for displaying audio signals An audio signal is connected to one of two orthogonal deflection means on a kinescope and the audio signal phase shifted by 90 degrees is connected to the other deflection means. The phase shift device shifts the phase by 90° at one or more given frequen... | 03/25/1980 |
| 4176375 | Apparatus for video display of audio frequency patterns An apparatus is disclosed for connection to the antenna input of a television receiver. The apparatus has an audio frequency input connection and includes means to convert an audio signal into a pleasantly varying form for display as a varying pattern on ... | 11/27/1979 |
| 4168508 | Audio-to-video converter-modulator An audio signal to color pattern display signal converter-modulator includes an input audio signal section, four frequency band filters, horizontal sync and sweep circuitry, vertical sync and sweep circuitry, a pulse width modulator section, a level conve... | 09/18/1979 |
| 4167752 | Color video display for audio signals A system for generating an aesthetically pleasing abstract display on the screen of a color television receiver in timed relation to an audio signal derived from music or the like employs a filter network to divide the audio signal into a plurality of sep... | 09/11/1979 |
| 4160875 | Security system A security system for use in homes, hotels, businesses, schools, streets, and other locations requiring a high degree of security but where it is important to insure the privacy of the protected individual.... | 07/10/1979 |
| 4135203 | Method and apparatus for generating complex visual patterns A method and apparatus for generating a complex visual pattern in conjunction with a two dimensional display having X and Y deflection means. The method comprises deriving two signals for application to the deflection means, each consisting of a DC compon... | 01/16/1979 |
| 4128846 | Production of modulation signals from audio frequency sources to control color contributions to visual displays Disclosed are apparatus and method for modulating color contributions in visual displays with audio modulating signals. Particular embodiments disclosed separate input audio frequency signals into modulating signals characterized by particular frequency r... | 12/05/1978 |
| 4118601 | System and a method for equalizing an audio sound transducer system A system and a method of electronically equalizing the composite transfer function of a sound system and a room which receives the sound generated by the sound system. A test signal, such as white or pink noise, is applied to the sound system and a microp... | 10/03/1978 |
| 4099025 | Methods and means for avoiding false indications of activity in a multimicrophone system Means and method of reducing the probability of false indications of microphone activity in a multimicrophone system incorporating means for sensing the activity of microphones. The microphone, which is truly active, will receive its signal from its user ... | 07/04/1978 |
| 4088836 | Acoustically responsive signal injection system for headphone users A gated oscillator is coupled to a set of headphones through a connector interposed between the headphone plug and a mating jack in a stereo receiver or other source of audio information. An acoustic pickup is coupled to the oscillator through circuitry w... | 05/09/1978 |
| 4081829 | Audio activated video display An interface unit for providing visual color display of objects on an unaltered TV receiver which are directly associated with the music on an audio source. Audio energy is derived from separate channels of a stereo system. This audio information is prese... | 03/28/1978 |
| 4068262 | Auxiliary variable coordinate sonic display system Method and apparatus for creating a dynamic image on a television receiver display screen reflecting mood and character of music. Methods of pattern generation and color modulation are described. The pattern as seen by a viewer is a derived X-Y coordinate... | 01/10/1978 |
| 4060803 | Security alarm system with audio monitoring capability A security alarm with audio monitoring capability including a remote location to be protected, a central monitoring station and transmission lines coupled therebetween. The remote location includes a circuit for generating a DC transmission signal of a fi... | 11/29/1977 |
| 4001880 | Audio to video translator An audio to video translator in which an RF oscillator having a frequency within the commercial television broadcast band is coupled to the antenna terminals of a commercial home television receiver and tuned to the selected channel with no other antenna ... | 01/04/1977 |
| 3990105 | Audio-visual convertor Apparatus for generating a display upon the screen of a television receiver which display changes with changes in the audio frequency signal is disclosed comprising a carrier signal source, a color subcarrier signal source, a horizontal synchronizing sign... | 11/02/1976 |
| 3940789 | Multicolor display for the visual-aesthetic portrayal of electric signals A multicolor visual display apparatus for stereophonic sound signals is disclosed. The display apparatus includes a conventional three gun color cathode ray tube, having a screen with a plurality of colored phosphor dot triads. Stereophonic signals are co... | 02/24/1976 |
