960/853: Difference between revisions
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'''960/853''' is an interval extremely close to the Pythagorean major second [[9/8]], differing by the [[Unnoticeable comma|unnoticeable]] [[superparticular]] comma of 2560/2559. | '''960/853''' is an interval extremely close to the Pythagorean major second [[9/8]], differing by the [[Unnoticeable comma|unnoticeable]] [[superparticular]] comma of [[2560/2559]]. | ||
Sine tones with frequencies of 960Hz and 853Hz, sounded together, comprise the "Attention Tone" used by the U.S [[wikipedia:Emergency_Alert_System#EAS_header|Emergency Alert System]] over public broadcasting. Using these exact tones over broadcast media is [[wikipedia:Emergency_Alert_System#Tone_usage_outside_of_alerts|illegal in the United States]], in order to protect the integrity of the system. | Sine tones with frequencies of 960Hz and 853Hz, sounded together, comprise the "Attention Tone" used by the U.S [[wikipedia:Emergency_Alert_System#EAS_header|Emergency Alert System]] over public broadcasting. Using these exact tones over broadcast media is [[wikipedia:Emergency_Alert_System#Tone_usage_outside_of_alerts|illegal in the United States]], in order to protect the integrity of the system. | ||