By Joshua A. Udall and Jonathan F. Wendel
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32 to speed up or slow down the UART receiver to match the data rate. Th e result is called a "self clocking" recording method . Table 2 shows us some standards for a set of signals that meet the specification of constant amplitude si ne waves or half sine waves that are zero crossing switchable and still give us the ability to extract self clocking digital information off a single audio cassette track. To record a one, we record 16 half sine waves of a frequency that is eight times the data rate.
As long as th e 2400 Hz signal is being rece ived , the o ne shot is co nstan tl y retriggered and does not time out. Thi s cau ses flip flop IC 5a to remain at th e high state interpreting th e data as a logic o ne. When the 1200 Hz sign al is received , its period is long enough to allow the o ne shot to tim e out. Flip fl op IC5a is immedi ately reset. It stays at the low state as long as th e 1200 Hz signa l is being received, because the one shot is ti med out whenever the next trigger ing edge occ urs.
If, however, the tape was prepared on precision tape recording equipment (such as may be used for mass production of cassettes fo r widespread di stribution), then pl ayed o n a consu mer quality tape pl aye r, the tolerance of the recovery circuit to a dec rease in tape speed will be diminished. Thi s may prov id e some arg ument for increasing the period of the one shot 5 percent. A characteristic of the data recovery circuit used is th at it causes an ap prox i· mate ly 6 percent marking bi as in the recove red waveform.
