Resources Contact Us Home
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
Formation of an optical waveguide
Stable liquid VEGF antagonist formulations
Compositions and processes for forming photovoltaic devices
Method and apparatus for complementing an instrument panel by utilizing augmented reality
Expandable mobile device
Wearable display device
Providing policy-based operating system services in an operating system on a computing system
  Randomly Featured Patents
Armor-protection for a wall, for example a bombshelter or an armored vehicle
Optical recording medium and process for producing same
Payment entity for account payables processing using multiple payment methods
Cellular phone
Ceiling fan motors
Apparatus and method for medium access control in an optical packet-switched network and the network thereof
Process for upgrading heavy hydrocarbons employing a diluent
Diaphragm assembly
Remote control
Hair styling gel composition