disabled. When the middle sensor is triggered, one of the outputs will be set to 1. Tallinn University of Technology March 2013 COUNTER Counter block does exactly what the name suggests, but with a little twist. The counter itself counts the amount of cars in the parking lot. The part beneath it subtracts that number from 5 and equals to the amount of free spaces. The amount of free spaces is needed to be outputted on the screen. The actual output of this function is whether or not to turn on the green light (and off the red light) in front of the parking lot. Tallinn University of Technology March 2013
normal tones. The better band-splitters shift these substitutions every few seconds or milliseconds. The result sounds something like a recording of a Mah-Jongg game played too fast. Masking systems bury the voice signal in noise. The music from a phonograph record can be electrically superimposed on the voice, drowning it out. The descrambler, which must have an identical disk precisely synchronized with that of the scrambler, subtracts the phonograph signal out, leaving the voice. These systems resemble null ciphers, which interlard the true message within a welter of spurious symbols. Another system is wave-form modification. A fluctuating electrical current operates upon the voice current to produce rapid and extreme variations in the amplitude of the transmitted speech. This sounds rather like a radio whose volume control is being turned up to full blast one instant and then down to a whisper the next. In the
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