Resources Contact Us Home
Midlevel carrier modulation and demodulation techniques

Image Number 3 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
Error detection and recovery tool for logical volume management in a data storage system
Header rail for a shower screen or the like
Method of making a CIG target by cold spraying
Method of inspecting wafer
Mechanism for visible users and groups
High voltage fast recovery trench diode
Direct mode adapter based shortcut for FCoE data transfer
  Randomly Featured Patents
Musical instrument covering
Guidance and control for an autonomous soaring UAV
Evaporator boat for an apparatus for coating substrates
Projection exposure apparatus
Apparatus and process for forced lubrication piercing
Method and apparatus for fastening an eraser to a pencil
Color highlighting accessory for a monochromatic printer
In place gas cleaning of diffusion elements
Image sensing device
Transmitter for and method of transmitting a wideband digital information signal, and receiver