Methods of forming a tapered evanescent coupling region for use with a relatively thin silicon optical waveguide formed with, for example, an SOI structure. Hence a discomfort feeling due to restraining around the head of the user can be reduced. The static synchronous compensation unit 202 comprises a plurality of static synchronous compensation modules 302 for compensating for the reactive power in the electricity system 100. At least a portion of the trailing edge of the log can remain uncovered either by having windows in the wrap or by the rigid cover only covering the leading edge of the log surface. The present invention includes extracting side information embedded in non-recognizable component of audio signal components and decoding the audio signal using the extracted side information.