That voltage fluctuations and frequency variations spoil the fun of hi-fi digital sound systems is the complaint of many a music fan. PS Audio, a company based in Avon, Colorado, USA, has developed a device worth US $1,000 that delivers a pure waveform when plugged into the electricity mains. The device takes power from the mains and converts it from AC to DC and back again. The systems relies on a digital signal processor.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/music-freaks
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/down-earth
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/technology
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industrial-technology
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-states-america-us
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/electronics