Did You Know...
...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7391976 | Optical acoustoelectric transducer An optical acoustoelectric transducer having a directivity pattern like a better 8 by receiving by a light-receiving element a reflected fraction of the light from a light-emitting device disposed at the center of a bottom plate that is parallel to a diaphrag... | 06/24/2008 |
| 7286767 | Optical transceiver over single communication link A method, apparatus, and system for optical communications. An optical transmit signal is generated in response to an electrical transmit signal. The optical transmit signal is coupled into a single communication link for transmission there over. An optical receive ... | 10/23/2007 |
| 7277642 | Fine displacement detection device by sound or the like A fine displacement detection device by sound or the like: which can easily align individual optical components; which disposes a light emitting element (13) and a light receiving element (14) on a substrate, emits light from the light emitting element... | 10/02/2007 |
| 7257327 | Wireless communication system with high efficiency/high power optical source An optical communication system is provided which includes an optical signal transmitter which communicates high bandwidth, high power frequencies. The optical signal transmitter includes a high efficiency/high power optical source such as an optical magnetron or a ... | 08/14/2007 |
| 7221875 | Diaphragm structure of light-sound converter An optical-acoustic transducer in which light is irradiated to a reflecting portion from a light emitter, and a reflected light from the reflecting portion is received with a light receiver to detect a position of a vibrating section, cantilevers are formed by perfo... | 05/22/2007 |
| 7212749 | Signal receiver having wide band amplification capability An Improved Signal Receiver Having Wide Band Amplification Capability is disclosed. Also disclosed is a receiver that is able to receive and reliably amplify infrared and/or other wireless signals having frequency bandwidths in excess of 40 MHz. The receiver of the ... | 05/01/2007 |
| 7079717 | Control circuit for IEEE 1394b optical transmission protocol An On-Off control circuit between the IEEE1394a and IEEE1394b compliant physical layer (PHY) output driver circuitry and the glass fiber optical physical medium dependent (PMD) sub-layer within the architecture of the IEEE 1394b standard addresses the stability issu... | 07/18/2006 |
| 7061609 | Measuring wavelength change An optical wavelength analyser including: an entrance slit (4) for receiving a light beam (3) including signals with various wavelengths and passing the beam at least partly; a diffractor (6, 7, 9) for receiving the passed beam and diffracting t... | 06/13/2006 |
| 6424441 | Method and apparatus for sensing an audio signal that is sensitive to the audio signal and insensitive to background noise A method and apparatus for sensing audio frequency-pressure modulation of the moisture content of the atmosphere caused by a moisture-laden audio source, such as a live human voice, is disclosed. A first light emitter is provided to generate a first light... | 07/23/2002 |
| 6301034 | Pulsed laser microphone A microphone and method of use in which pulsed laser light is directed against a reflective diaphragm which is vibrated by sound waves thereby modulating the pulsed laser light reflected from the diaphragm. The modulated, pulsed laser light is transmitted... | 10/09/2001 |
| 6154551 | Microphone having linear optical transducers Microphone having linear optical transducers. The present invention includes the use of linear optical transducers in several configurations to detect the motion of one or more conventional microphone diaphragms in proportional response to incident acoust... | 11/28/2000 |
| 6147787 | Laser microphone A microphone for detecting sound pressure waves includes a laser resonator having a laser gain material aligned coaxially between a pair of first and second mirrors for producing a laser beam. A reference cell is disposed between the laser material and on... | 11/14/2000 |
| 6014239 | Optical microphone An optical microphone includes a laser and beam splitter cooperating therewith for splitting a laser beam into a reference beam and a signal beam. A reflecting sensor receives the signal beam and reflects it in a plurality of reflections through sound pre... | 01/11/2000 |
| 5910855 | Passive acousto-optic modulator A passive acousto-optic modulator for the modulation of a light beam as a function of a variation in air pressure comprising a beam splitter arranged relative to the beam so as to produce a signal beam and reference beam, the beam splitter ideally compris... | 06/08/1999 |
| 5717774 | Photothermal acoustic device A photothermal apparatus is provided for controllably heating and cooling a gas in order to alter and thereby control the acoustic, mechanical or optical properties of the gas. For acoustic applications, the photothermal device may be used to heat and coo... | 02/10/1998 |
| 5694477 | Photothermal acoustic device A photothermal apparatus is provided for controllably heating and cooling a gas in order to alter and thereby control the acoustic, mechanical or optical properties of the gas. For acoustic applications, the photothermal device may be used to heat and coo... | 12/02/1997 |
| 5619583 | Apparatus and methods for determining the relative displacement of an object A microphone is disclosed which converts an audio signal directly into a digital representation by analyzing and digitizing the distortion imposed upon a signal, such as a string of regularly spaced pulses as a result of the displacement of a diaphragm, r... | 04/08/1997 |
| 5333205 | Microphone assembly A microphone assembly (134) includes a movable diaphragm (124) and a linear light gradient (130) which causes the movement of diaphragm (124) to be translated into a corresponding amplitude of light to be received at a photo-detector (116). Thereby provid... | 07/26/1994 |
| 5060308 | Firefighters mask communication system A communication system for attachment to a standard type of firefighter's face mask. Generally speaking, the communication system is mounted on opposite sides of the glass/plastic lens portion without affecting the integrity of the mask seal or the breath... | 10/22/1991 |
| 4689827 | Photofluidic audio receiver A photofliudic audio receiver for producing sound directly from light modulated at audio frequencies and amplifying the sound to deliver uniform frequency response over a wide audio frequency range, utilizing only fluidic and thermal devices. It includes ... | 08/25/1987 |
| 4566135 | Pressure transducer A pressure transducer as a microphone comprises a base body with a flat polished surface and a diaphragm contacting the flat surface at a plurality of spaced points. The base body consists of a material transparent for optical radiation, and is provided w... | 01/21/1986 |
| 4002897 | Opto-acoustic telephone receiver An opto-acoustic telephone receiver, for converting optical signals propagating in an optical fiber waveguide into audible acoustic signals, includes an optical absorption cell having a volume of the order of 10-.sup.3 cm3, acoustica... | 01/11/1977 |
