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










Image Number 6 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
Data processing apparatus including reconfigurable logic circuit
Biaxially oriented film which could be thermally laminated with paper and other substrates
Multi-bank queuing architecture for higher bandwidth on-chip memory buffer
Optical fixing device and image forming apparatus
Semiconductor device
Method for measuring and improving organization effectiveness
Sample analyzing device
  Randomly Featured Patents
Device for the transfer of bobbins from a conveyor belt with a large loading capacity to a bobbin conveyor with a small loading capacity
Device and method for percutaneous myocardial revascularization
Quadrature-quadrature phase shift keying
Nonvolatile semiconductor memory device and method of manufacturing the same
Band applicator for applying a band about a sheet of material and a pot
Reduced pressure treatment system
Universal weakened strut support
Speed reducer, robot hand and robot
Decorative products created by lazing graphics and patterns directly on substrates with painted surfaces
Vehicle front body structure of a vehicle of framed construction