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
Method and computer system for automatic vectorization of a vessel tree
Regenerative power storage system mounted on DC electric railway car
Graphical planner
Flat panel crystal display employing simultaneous charging of main and subsidiary pixel electrodes
Triazine ring-containing polymer and film-forming composition comprising same
Error protection for pipeline resources
Method for using extended security system, extended security system and devices
  Randomly Featured Patents
Method and device for measuring heights of patterns
Truck cargo box enclosure
Substrate bias circuit
Speed control system for a ceiling fan motor
Stored program controlled digital public exchange
Low power, high resolution timing generator for ultra-wide bandwidth communication systems
System, method and computer program product for providing content to a terminal
Freestanding plastic container for controlled combustion of alcohol-based lighter fluid
Laser beam machining apparatus
Process for continuous spinning of hollow-fiber membranes using a solvent mixture as a precipitation medium