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
Ionic compound, anti-static pressure-sensitive adhesive and polarizer comprising the same
Active gate drive circuit
Heat retaining device
Vanilloid receptor ligands and use thereof for the production of pharmaceutical preparations
Radio communication device and sequence length adjusting method
Methods and apparatus to provide haptic feedback
Vehicle headlight
  Randomly Featured Patents
Fiber optic current meter with plastic bucket wheel
Anti-theft locking device for a vehicle steering wheel
Composition to enhance the bioavailability of curcumin
Projector stacking stand
Microwave heating apparatus
Preparation of petroleum pitch
Abrasion switch device for detecting low tire pressure
Open-end spinning apparatus with a spinning rotor driven by a single motor
Anaerobic microbial composition and methods of using same
Process for forming high-quality deposited film utilizing plasma CVD