| 摘要 |
1,255,224. Visual signalling. SANDERS ASSOCIATES Inc. 13 March, 1969 [18 March, 1968], No. 13243/69. Headings G4F and G4H. Apparatus for recognizing a coded pattern on the screen of a cathode ray tube comprises means for sensing the coded pattern, to generate a corresponding pattern of signals, and means responding to these signals to make a record. The sensing means may consist of a gun-shaped device adapted to be held in the hand and directed at one of a number of points 60, 62, 64 on the C.R.T. These may be associated with the answers to a question and the coded pattern may be a rapid sequence of flashes which is odd or even in number according as to whether the answer is wrong or right. A decoder detects a sequence indicating a right answer and energizes an oscillator to make a recording on a magnetic disc or tape. The disc or tape may be advanced by the operation of the trigger 32. Instead of using magnetic recording a current sensitive paper can be used, marked by the passage of current, or light sensitive paper marked by light, e.g. from a neon lamp. In another form a coded pattern of bits may be transmitted "1" being represented by 10 pulses, " 0 " by the absence of pulses for a similar period. A detector is provided to respond to a " 1 " signal and energize the oscillator and make a recording of the transmitted pattern. |
