Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Midlevel carrier modulation and demodulation techniques










Image Number 9 for United States Patent #4989219.

Several techniques are disclosed for producing modulation of a carrier signal wherein each transition of the modulated carrier signal includes a midrange level and/or two midrange characteristics, the level and/or ratio of the two midrange characteristics representing data carried by that transition. A simplified method over that disclosed in parent application Ser. No. 590,281, filed Mar. 16, 1984 now U.S. Pat. No. 4,613,974 is disclosed herein, and is referred to as a "flipped sine wave" method of producing the modulated carrier signal. Another technique, referred to as a "third harmonic modulation" technique uses the phase relationship between a fundamental and its third harmonic to produce the modulated carrier signal. A technique for storing the modulated carrier on magnetic media and correcting for offset resulting therefrom or from attenuation and advance of the third harmonic relative to the fundamental to permit accurate demodulation is disclosed.








 
 
  Recently Added Patents
Progressively discovering and integrating services
Retransmission and retransmission request in data communication systems
Electronic hand-held device
LED drive circuit
Packet communication system and packet communication method, and node and user device
Low offset, fast response voltage controlled current source and controlling method thereof
Semiconductor device and method of adjusting characteristic thereof
  Randomly Featured Patents
Dental casting resin from acrylic monomer, acrylic resin, and vinyl chloride resin
Wireless communication device and method
Optical focusing system
Slide projector having a partitioned magazine
Player
Voltage-programming scheme for current-driven AMOLED displays
Dry transfer graphics article and methods of preparation and use thereof
Load limiting seat belt retractor
Square ashtray
Touch sensor array systems and display systems incorporating such