Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Reading signal processing circuit in optical information reproducing apparatus










Image Number 3 for United States Patent #5164933.

In this invention, a reading signal detected by a photodetector is input into two differentiating circuits of different differential constants. The first differentiating circuit differentiates the reading signal with the differential constant larger than that of, for example, the second differentiating circuit and lowers the level of the noise component present as mixed in the reading signal. The first comparing circuit removes the noise component, for example, below the threshold value. The second differentiating circuit differentiates the reading signal with the differential constant converting the peak point of the reading signal, for example, of the above mentioned photodetector to a zero crossing point. The second comparing circuit compares the differential signal of the above mentioned differentiating circuit with the threshold value set, for example, on the zero level and makes the output signal rise, for example, in the center position of an information pit. A bivalued signal logical circuit obtains a bivalued signal made by bivaluing the reading signal from the respective output signals of the first and second comparing circuits.








 
 
  Recently Added Patents
2-aryl-4-quinazolinones and their pharmaceutical compositions
Photographic printing paper and method of making same
Digital media content distribution
Recovery of a hot-pluggable serial communication link
Monitoring system
Topical antibiotic composition for the prevention of Lyme disease
Methods and systems for managing electronic messages
  Randomly Featured Patents
Optical disc drive, timing signal generator, and information recording and reproduction method
Stop flow interference lithography system
Method for freeze granulation
Refractory brick for molding molten steel
Semiconductor integrated circuit and data processing system
Speaker suspension device
Wide tire tread
Detection of nucleic acid sequences by invader-directed cleavage
Method and device for manufacturing information carriers
Combination eating utensil