| http://www.w3.org/ns/prov#value | - Still further, there is a need in the art for method and apparatus for performing such frequency analysis of analog signals and of digital signals, whether the digital signals are digitally encoded by a differential encoding scheme or a non-differential encoding scheme such as a linear encoding scheme, a u-law encoding scheme, an A-law encoding scheme, a pulse code modulation (PCM) encoding scheme
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