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i entered the music audio industry when i co-founded audio research in 1990 and became the creative director. the number one problem i was trying to solve in that industry was piracy. people i met from the vinyl label side, including our accountant, said the only thing you had to worry about was theft. i was told that once the vinyl was pressed, they could not be stolen, so i eventually designed our adat-s6 digital compact disc recorder to police discs. at the same time we founded crescendo, because from the beginning we were more interested in the technology and design than the total number of tunes i put on it. unfortunately, i was forced to shelve it when the economy went south and continued building audio equipment for fractional profit until my last company, blue ribbon audio, in 1996how simple can the thing be? well, first we have a laser that is modulated to produce a return-to-zero pulse. by attenuating the input, we control the amplitude of the pulse and the actual intensity of the beam. thus, we can control the speed of the disc. second, we have a buffer to hold information for the duration of the pulse. typically, about one hundred milliseconds is a reasonable amount to hold. third, we have a 16-bit a/d converter that acquires the information for us at an 8 khz sample rate. finally, we have a microcontroller that controls the aforementioned laser, the buffer, the a/d converter, and various i/o devices. thats about it. i tried to keep the schematic as simple as possible and avoided the use of power supplies, but the above describes what we used to build the first prototype. in a nutshell, the digitizer reads the beam and produces digital data for the laser driver. a power supply and ac-to-dc converter produce a usable dc voltage for a laser driver, and an fpga takes care of all of the timing.
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