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The size of an interval between two notes may be measured by the ratio of their frequencies.When a musical instrument is tuned using a just intonation tuning system, the size of the main intervals can be expressed by small-integer ratios, such as 1:1 (), 2:1 (), 5:3 (major sixth), 3:2 (perfect fifth), 4:3 (perfect fourth), 5:4 (major third), 6:5 (minor third).
In 13 limit tuning, there is a tridecimal 2 / 3 tone (13:12 or 138.57 cents) and tridecimal 1 / 3 tone (27:26 or 65.34 cents). In 17 limit just intonation, the major diatonic semitone is 15:14 or 119.4 cents ( Play ⓘ ), and the minor diatonic semitone is 17:16 or 105.0 cents, [ 19 ] and septendecimal limma is 18:17 or 98.95 cents.
The ratio of frequencies of two notes an octave apart is therefore 2:1. Further octaves of a note occur at 2 n {\displaystyle 2^{n}} times the frequency of that note (where n is an integer), such as 2, 4, 8, 16, etc. and the reciprocal of that series.
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In the United States and other countries where television uses the 59.94 Hz vertical scanning frequency, video is broadcast at 29.97 frame/s. For the film's motion to be accurately rendered on the video signal, a telecine must use a technique called the 2:3 pull down (or a variant called 3:2 pull down) to convert from 24 to 29.97 frame/s.
Investigators are exploring whether two apparently unrelated murders ... The ‘murder gang’ of computer whizzkids linked to the killings of a Border Patrol agent and a landlord 3,000 miles apart.
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Common tones are also called connecting tones, and in part-writing, are to be retained in the same voice. Chords which are four or five degrees apart have one common tone. Chords which are three or six degrees apart have two common tones. Chords which are one or seven degrees apart have no tone in common. (Woodruff 1899, p. 61)