229873 ⎘
Television systems; Analogue secrecy systems; Analogue subscription systems; Systems rendering the television signal unintelligible and subsequently intelligible; Systems operating in the amplitude domain of the television signal by inverting the polarity of active picture signal portions
Control device, medical observation system, control method, and computer readable recording medium
#2Secure control and operation of drones
#3System, method, and computer program product for inverting a polarity of each cell of a display device