Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Quadrature modulation apparatus, method, program, and recording medium










Image Number 8 for United States Patent #7944989.

An RF signal, which has been obtained by a quadrature modulation, is corrected without performing quadrature demodulation. There are included an in-phase multiplier, a quadrature multiplier, an adder, a power detector, and an error determining part. The in-phase multiplier outputs an in-phase conversion signal by mixing an in-phase local signal of a predetermined local frequency with an in-phase correction user signal obtained by adding an in-phase user signal to an in-phase correction signal of a sinusoidal voltage outputted from an in-phase correction signal output unit. The quadrature multiplier outputs a quadrature conversion signal by mixing a quadrature local signal, which is different in phase by 90 degrees from the in-phase local signal, with a quadrature correction user signal obtained by adding a quadrature user signal to a quadrature correction signal, which is different in phase by 90 degrees from the in-phase correction signal, from a quadrature correction signal output unit. The adder adds the in-phase conversion signal to the quadrature conversion signal. The power detector measures an output voltage of the adder. The error determining part determines, based on the measurement result of the power detector, the error of the quadrature modulation.








 
 
  Recently Added Patents
Sampling filter device
Case
Calendar integration methods and systems for presentation of events having combined activity and location information
Particulate filter with hydrogen sulphide block function
Modular authoring and visualization of rules using trees
Method of making an array of nucleic acid colonies
Protocol delay measuring device and protocol delay measuring method
  Randomly Featured Patents
Toggle bar link for conveyor and guideway pans and toggle bars, toggle bar sockets, safety elements, pans and assembly tools for toggle bar links
Low speed speech encoding method based on Internet protocol
Disc player
Method of creating a virtual traffic network
Cart for supporting a line marker
Process for the production of porous moulded articles containing alginate
Roller bottle for trans-membrane co-culture of cells and method for its use
Tray for paper beading apparatus
Beverage brewing system
Fuse assembly