Resources Contact Us Home
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
High performance strained source-drain structure and method of fabricating the same
Notification systems and methods that consider traffic flow predicament data
Automated incorporation of expert feedback into a monitoring system
Image pickup device with a plurality of pixels and an AD conversion circuit
Haloalky -substituted amides as insecticides and acaricides
Light emitting device power supply circuit, and light emitting device driver circuit and control method thereof
Electronic package with fluid flow barriers
  Randomly Featured Patents
Apple tree named `Big Red Gala`
Non-disruptive migration of coordinator services in a distributed computer system
Magnetic field sensor measuring a direction of a magnetic field in a plane and current sensor
Flood barrier
Impregnation of a lignocellulosic material
Scalable presence distribution system and method
System and method for processing booting failure of system
Barrel cam shift mechanism
Decorative arrangement for a child's shoe