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
Isolated hole detection and growth
Road delineator
Tubular film, device and method for producing the same
Method and apparatus for providing geospatial and temporal navigation
Method for precoding using a block diagonal matrix
Integrated circuit package with input capacitance compensation
Bipolar photovoltaic array grounding apparatus and method
  Randomly Featured Patents
Center cinch and release of buttress material
Apparatus, and associated method, for providing router advertisement information to a mobile node in a radio IP system
Liquid crystal display panel with marks for checking cutting precision by visual inspection
Wet-laid, non-woven fabrics
Hemerocallis plant named `Robbobmar`
Bicycle drive chain
Fan and controlling device thereof
Bottle
Bottle closure for sales promotion
Anti-glitch circuit for voice-coil-motor servo operation in disk drive systems