The invention is directed to a \u201cSelf-Reinforced Composite\u201d made of recycled thermoplastic polymers, methods and an apparatus for their manufacture. The index of refraction for all of the materials is preferably matched, such that reflections between interfaces are minimized. An incoming analog signal is converted to a digital signal and sampled a predetermined number of times at intervals greater than the maximum pulse interval to record a set of minimum signal values and a set of maximum signal values. The indexable words are then displayed to the user.