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Even though eight years have elapsed since the CD Player was first introduced to the audio market, the analog-versus-digital controversy continues unabated, with proponents of each camp firmly entrenched in their beliefs. FEDAC (Fluency DAC) is a digital-to-analog converter employing a new interpolation function which was developed based on studies done by Professor Toraichi and his team at Tsukuba University. As a D/A converter in CD players and other digital audio sources, the FEDAC has been highly acclaimed for it's capability to reproduce musical presence, depth, and ambience with vivid realism. The following describes the operating principle of the FEDAC. The cost and size reductions using digital processing technology are also described.