System and method for transmission of information

System for authenticating users and devices in on-line transacti

System for automatic synchronization of blocks transmitting a se

System for coding two-dimensional information

System for compensating for incorrect duty factor when reading o

System for conducting a television audience survey

System for controlling polarity state of start-stop telegraph si

System for converting frequency band of picture signal

System for converting the number of lines of a television signal

System for detecting a marker signal inserted in an information

System for detecting digital data transmitted by modulating a ca

System for determining burst sending timing in TDMA communicatio

System for determining the contour of a plane form

System for enciphering and deciphering data

System for evaluating similar objects

System for identifying and correcting the polarity of a data sig

System for improving the evaluation of pictures comprising detai

System for in-service quantitative performance analysis of data

System for inputting a security code to a computer

System for locally enciphering prime data