The size of some circuits belies their usefulness. This circuit detects whether two pulses occur within a given time interval of each other. A monostable, which is thought to be the anathema of digital design, is not explicitly used.
The latch provides a persistent result of whether the input frequency becomes higher than some preset value. A time interval of about 3 microseconds corresponds to the capacitor value shown, but this can be easily changed, of course.
Though Huffman coding is typically 15% more efficient than
Shannon-Fano trees, the corresponding subroutine has been added to the Huffman coding section anyway.
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