Resources Contact Us Home
Information recording and reproducing apparatus using sectors divided into a plurality of frames and having means for proper storage of the frame data

Image Number 8 for United States Patent #4805046.

An information recording and reproducing apparatus records and reproduces information on and from an optical recording disk having a sector recording format of frame structure in which data in each sector are divided into a plurality of frames, and a data head identification mark is affixed to the head of each of the frames, so as to prevent propagation of a demodulation error due to failure of word synchronization attributable to pull-out of a PLL during data reproduction. In the apparatus, one frame pulse is generated for each of the frames on the basis of a sector identifier detection signal and a frame data demodulation start signal, and, according to the result of counting the frame pulses, the frame numbers of frame data demodulated and stored in a sector buffer memory are accurately detected. The frame pulse is generated on the basis of the sector identifier detection signal until the data head identification signal is first detected, and, once the data head identification signal is detected, the frame pulse is generated on the basis of the data demodulation start signal. Therefore, even if the data head identification signal of a frame cannot be detected resulting in dropout of data in that frame, the succeeding frame data can be stored at the assigned addresses in the sector buffer memory.

  Recently Added Patents
Factor IXa crystals, related complexes and methods
Flat panel display device and method of fabricating the same
Dry-cooling unit with gravity-assisted coolant flow
Tone enhancement bracket
Polymeric compositions including their uses and methods of production
Polypeptides and immunizing compositions containing gram positive polypeptides and methods of use
Level-shift circuit, electro-optical device, and level shift method
  Randomly Featured Patents
Shaft seal device for submersible motor
Screen cylinder for screening high consistency pulp
Process for preparing phthalocyanine compounds
Bearing for a timepiece train
Two tier gazebo
Streaming system and streaming method
Image display apparatus
Auto sensing home base station for mobile telephone with remote answering capabilites
Production of diesel fuel from vegetable and animal oils
Method for making dried powdered fruit or vegetable salad