frame: fix typo reported by misspell
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@ -580,7 +580,7 @@ func (frame *Frame) correlate() {
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m *= 2
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// Notice that the integer division in mid = (left + right)/2 discards
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// the least significant bit. It can be reconstructed however, since a
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// sum A+B and a differance A-B has the same least significant bit.
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// sum A+B and a difference A-B has the same least significant bit.
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//
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// ref: Data Compression: The Complete Reference (ch. 7, Decorrelation)
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m |= s & 1
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