Byte - March 1976 by Virginia Williamson

By Virginia Williamson

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Obv iously a bette r modul ating signal would be a sine or tri angul ar waveform. On th e other hand , "doctoring" the square wave with filters is attractive from an economic viewpoint . Such filter ing can onl y be carried so far before the resulting differenti al amplitude of the two mod ul atin g frequencies produces "pumping" of the record er automatic level control circuits and begins to diminish the signal-tonoise ratio and signal drop out margins of the higher of the two modul ating frequ enci es.

Th e comments are somew hat technical and are intended for the advanced ex peri menter or designer. Modulator Waveform The nonlin earity and skewed frequency response of most low cost cassette record ers impose serious limitati ons on th e waveform of the record ed signal. In severe cases, the waveform recovered from a square wave input may be so seriously "tilted" and "peaked" and fill ed with overshoots th at data recovery is impossible. Obv iously a bette r modul ating signal would be a sine or tri angul ar waveform.

Voting can be done with a RC network, or a shift register and a majority logic gate. The analog method is cheaper, but the shift register scheme is data rate independent. You can use your lockout to prevent data entry during recorder leader, start, and stop times. You can use your existing error flags on the UART output to automatically stop TVT data entry or playback if a parity, framing, or overru n error happens. As noted earlier, these flags can be used with your computer software. If you have a TVT that uses any con trol signal as a carriage return, add a decoder to detect only the valid CR signal as a return and ignore all other mach ine commands.

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