| 摘要 |
A method, apparatus and an article of manufacture having thereon a computer program, all for reducing data in groups of N values per group. The largest X values of the N values of each group is found. All but the largest X values of each group is set equal to zero. Respective ones of the N values produced are averaged to produce N average values. The largest Y of the N average values are set equal to a first binary value, and a remainder of the N average values are set equal to a second binary value. In one application, a signal is divided into a series of frames. For each frame, a spectrum of the signal is divided into a series of N frequency segments and the N values represent the amplitudes of the frequencies in the signal. Broadcast content is recognized.
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