Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Patent
1994-06-13
1995-04-25
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Frequency or phase modulation
455110, 455205, 455344, 455351, 381 3, H04B 100
Patent
active
054107350
ABSTRACT:
Systems, 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 3f.sub.H 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.
REFERENCES:
patent: 2287065 (1942-06-01), Roberts
patent: 2508853 (1950-05-01), Bond et al.
patent: 2831105 (1958-04-01), Parker
patent: 3590382 (1971-06-01), Kenney
patent: 3697941 (1972-10-01), Christ
patent: 3934201 (1976-01-01), Majefski
patent: 3984625 (1976-10-01), Camras
patent: 4021737 (1977-05-01), Trask
patent: 4097893 (1978-06-01), Camras
patent: 4145720 (1979-03-01), Weintraub et al.
patent: 4259746 (1981-03-01), Sandstedt
patent: 4386436 (1983-03-01), Kocher et al.
patent: 4392022 (1983-07-01), Carlson
patent: 4434510 (1984-02-01), Lemelson
patent: 4484156 (1984-11-01), Khanna
patent: 4549179 (1985-10-01), Stendardo
patent: 4621374 (1986-11-01), Micic et al.
patent: 4685133 (1987-08-01), Iggulden
patent: 4694338 (1987-09-01), Tsinberg
patent: 4739413 (1988-04-01), Meyer
patent: 4771344 (1988-09-01), Fallacaro et al.
patent: 4847903 (1989-07-01), Schotz
patent: 4916532 (1990-04-01), Streck et al.
patent: 4939770 (1990-07-01), Makino
patent: 4980665 (1990-12-01), Schotz
patent: 4984296 (1991-01-01), Schotz
patent: 5012350 (1991-04-01), Streck et al.
patent: 5023933 (1991-06-01), Karkota, Jr.
patent: 5151668 (1992-09-01), Kim
patent: 5299264 (1994-03-01), Schotz et al.
"New 902-928 MHz Band Now Open!", Spec-Com Journal, Sep./Oct. 1985, cover page and p. 9.
Federal Register, vol. 50, Aug. 22, 1985, Final Rulemaking re addition of 902-928 MHz band to Amateur Radio Service Rules, pp. 33937 through 33940.
"Reference Data for Engineers: Radio, Electronics, Computer and Communications", Howard W. Sams & Co., Inc., 7th Edition, 1986, cover page, and pp. 1-5, 1-18 and 35-10 through 35-15.
"TVC-9 GaAs FET 33 cm ATV Downconverter", Spec-Com Journal, Sep./Oct. 1986, cover page and pp. 20-21.
Jerry Iggulden, Rule Making Petition to Federal Communications Commission, Sep. 11, 1985.
FCC Public Notice Report No. 1544, Oct. 21, 1985 (two pages) and certification that the same is a true and correct copy.
Hap Griffin, "HAM-TV, Amateur Radio's Visual Mode That Blends, Voice, Video, Photography & Experimentation!", A5 Amateur Television Magazine, Sep. 1984, pp. 6-9.
P. C. Electronics, Advertisement, A5 Amateur Television Magazine, Sep. 1984, cover/table of contents page and pp. 20-23.
Henry B. Ruh, "All About Amateur TV", QST Magazine, Jun. 1981, pp. 11-12.
E. Laird Campbell, "Amateur TV-The Easy Way", Qst Magazine, Nov. 1962, pp. 33-41 and 150.
1981 Radio Amateur's Handbook, published by the American Radio Relay League, cover page and pp. 14-28 to 14-33.
Fenton, Radio Electronics, Nov. 1987, p. 4.
"Cordless TV Headphones" SYNC catalog, Spring 1989, p. 5.
"Wireless TV Marriage Saver" DAK catalog Summer 1989, p. 1.
Electronic Circuits; Collins Raymond; 1980; p. 289 (figure 21-50).
"A Complete Single Chip AM/FM Radio Integrated Circuit" Okanobu et al., IEEE vol. CE-28, No. 3, Aug./1982; pp. 393-407.
Borchardt Robert L.
McGreevy William T.
Nawarange Ashok
Rodriguez Efrain L.
Eisenzopf Reinhard J.
Faile Andrew
LandOfFree
Wireless signal transmission systems, methods and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wireless signal transmission systems, methods and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wireless signal transmission systems, methods and apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1574901