Wireless signal transmission systems, methods and apparatus
Patent 5410735 Issued on April 25, 1995. Estimated Expiration Date: 
June 13, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 13, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2287065 2508853 2831105 3590382 3697941 Low power consumption stereo transmitter and receiver system Portable video recording system employing camera and recording stations connected by a wireless link System for processing and transmitting audio signals received from a television set for reproduction by a high fidelity FM receiver Portable video recording system employing camera and recording stations connected by wireless links Remote control InventorsApplicationNo. 259339 filed on 06/13/1994US Classes:455/42, Frequency or phase modulation381/3, FM final modulation455/110, Angle modulation455/205, Frequency or phase modulation455/344, Combined with diverse art device455/351TransportableExaminersPrimary: Eisenzopf, Reinhard J.Assistant: Faile, Andrew Attorney, Agent or FirmForeign Patent References
International ClassH04B 001/00AbstractSystems, methods and apparatus are provided for conducting local wireless audio signal transmissions from a local audio signal source to a person within a local signal transmission area. In certain embodiments, the transmissions are conducted over the 900 MHz local transmission band to a portable receiver unit supported on the headband of a stereo headphone unit. The receiver unit serves to down convert the 900 MHz signal to a local frequency band which is received by an FM receiver of the receiver unit which serves to reproduce the audio signals therefrom which are, in turn, converted to acoustic signals by electroacoustic transducers of the headphone. A transmitter unit includes a ceramic resonator stabilized FM transmitter, as well a filter for suppressing high frequency noise in an audio modulation signal, a stereo audio multiplexing unit utilizing a 3fH subcarrier and an overmodulation detection unit. In certain embodiments, the receiver unit is powered by a rechargeable battery which is recharged from the transmitter unit.Other References
Field of SearchFrequency or phase modulationWith modification of frequencies of analog signal passed (e.g., pre-emphasis and de-emphasis) Mobile or portable Angle modulation Including distributed parameter structure With frequency multiplication or division With frequency control Including tuning In antenna circuit With saturable reactor Automatically controlled Distributed parameter device Automatic adjustment of tuning Frequency or phase modulation With synchronized or controlled local oscillator With particular discriminator or detector Combined with diverse art device Transportable Remote control of receiver RECEIVER CIRCUITRY Tuning Sound circuit Broadcast or multiplex stereo FM final modulation WITH INDICATOR, SIGNAL, OR ALARM WITH DISTRIBUTED PARAMETER RESONATOR | |
