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
Electron beam manipulation system and method in X-ray sources
Systems and methods for documenting medical findings of a physical examination
System, method and computer program product for monitoring and controlling network connections from a supervisory operating system
Detachably integrated battery charger for mobile cell phones and like devices
Method and system for encrypting data in a wireless communication system
Down-drawable, chemically strengthened glass for cover plate
Connector with shielding device and method for manufacturing connector
  Randomly Featured Patents
Reversible color deck for rotary printing presses
Phase/frequency comparator
Methods of forming a tissue implant having a tissue contacting layer held under compression
Faceted vase
Method and apparatus which allows devices with multiple protocol capabilities to configure to a common protocol configuration
Image formation apparatus with supplemental light source
Complex oxide having n-type thermoelectric characteristics
Integrated magneto-optical having a magnetic head set back from an optical head
Accelerator for portland cement derived from fertilizer
5-Amino-1-phenyl-pyrazole-4-carboxylic acid derivatives and their use for controlling undesirable plant growth