All of these techniques together provide a generous 10 dB noise reduction, whilst leaving the original signal relatively unscathed. Finally, it also reduces the bandwidth of the signal to the precise audible range hence, eliminating any noise falling outside the range. In addition, since the human hearing cannot detect sound lasting less than a millisecond, this IC uses compression techniques to minimize the noise level. This IC also uses white noise to mask sound, which is an interesting method not commonly found in simple filter circuits. Psychoacoustic techniques are also used widely in MP3 compression, where parts of the sound spectrum that are outside of the human hearing are removed, thereby reducing the size of the data footprint. These are some very clever and advanced tricks with much science behind making them far better than ordinary filters. This circuit works very well because it uses psychoacoustic techniques to reduce the noise level.
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