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COMPRESS (Continued)
The compression algorithms determine how the compressed values are computed.
Specifying AVG (average) computes the average value of the points in the interval as the compressed value.
Specifying POS (positive) selects the highest point in the interval as the compressed value.
Specifying NEG (negative) selects the lowest point in the interval as the compressed value.
Specifying NRM (normal) computes the compressed value of the interval using the Rosenfell algorithm,
which chooses between negative and positive peak values.
Specifying PK-PIT (peak-pit) computes the greatest peak-to-peak deviation within the interval as the com-
pressed value.
Specifying PK-AVG (peak average) selects the difference of the peak and average value of the interval as the
compressed value.
Specifying SMP (sample) selects the last point in the interval as the compressed value.
The program below compresses a full sweep to one-fifth its size. The result is moved to trace A for display.
OUTPUT 71a;"DISPOSE ALL;IP;Al;EM;S2;TS;"
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OUTPUT 71a;"TFLDEF NEWA,200;"
OUTPUT 7 la; "FUNCDEF C-P, ! "
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OUTPUT 718;"S2;TS;"
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UT 71a;"COMPRESS NEWSI,TRA,AVG;"
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OUTP
OUTPUT 71a;"MOV TRA,NEW>;"
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OUTPUT
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E N D
5 6 P r o g r a m m i n g
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