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
Wine bottle
Ignition device in particular for an internal combustion engine, and method for manufacturing same
Real-time demand prediction in a fast service restaurant environment
Data recording apparatus with recording control based on defect block and control method thereof
Composite high reflectivity layer
Methods and systems for adapting a user environment
Quantifying the risks of applications for mobile devices
  Randomly Featured Patents
Shower curtain holding device
Deodorisation plant for fatty oils
Vertebral fixation device for the treatment of spondylolisthesis
Method and system for providing configuration of network elements through hierarchical inheritance
Synthetic peptides which contain sequences from factor VIIa, and the use thereof
Electrophotographic photoreceptors with charge generation by polymer blends
Optical disk device and tilt correction method for optical disk device
Antenna arrangement for a magnetic resonance apparatus
Retractable wheel lock
Hydrostatic drive system