Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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 4 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
Developing device
Human embryonic stem cell methods and PODXL expression
Biaxially oriented film which could be thermally laminated with paper and other substrates
Method and apparatus for reducing cost of optical amplification in a network
Message processing method and apparatus based on the SIP protocol and an IP communication system
System and method for logical separation of a server by using client virtualization
Forming agent for gate insulating film of thin film transistor
  Randomly Featured Patents
Freewheel mechanism for bicycles
Fuel Cell
Automated sales system
Process for the formation of SiO.sub.2 films
Compounds and methods for inhibiting cancer metastasis
Multi-stage fluidized bed reactor for dehydrogenation of hydrocarbons
Use of ultrasonic energy to decrease the gel strength of waxy crude oil
Modular dust collector
Method for manufacturing a product for destroying harmful animals
Apparatus and method for pseudo-synchronous communication between clocks of different frequencies