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
White light emitting diode (LED) lighting device
Multilevel directory assistance apparatus and method
Coating composition, and a process for producing the same
Method and device for reliable estimation of network traffic
Field emission cathode structure
Method for fabrication of a semiconductor device and structure
Valved, microwell cell-culture device and method
  Randomly Featured Patents
Peach tree named `Snow Peak`
Packaging unit
Hydrophilic, highly swellable hydrogels
Process for the production of 4-(trialkylammonium)-acetoacetarylides
Gas sensor
Servo motor controller using position interpolation
Two-level pressurization valve controlled by a fuel metering unit
Quick coupling
Disc brake system