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| Sarana Chatushtai ： ウィキペディア英語版 |
Sarana Chatushtai
The Sarana Chatushtai is the only experiment according to Bharata Muni to obtain the correct physical configuration of Śruti swara arrangement to Shadja Grama Notes on a musical instrument (Sa, Ri, Ga, Ma, Pa, Dha, Ni corresponding to 4-3-2-4-4-3-2 totalling 22 Srutis in a Saptak). The 22 Srutis are the only notes which can be useful for music in an “octave”, in this view. The sections below describe the experiment.
==Sarana Chatushtai experiment on two similar sitars==
The two veenas or sitars having the same qualities in all respect can be used to perform the Sarana Chatushtai experiment . Establish the Shadjagrama on both the similar sitars as per the methodology explained in Natya Shastra chapter 28 to keep shruties distance wise for the respective notes of the shadjagrama. Now we can measure the sruti value and hence provide 22 frets starting from the 5th sruti of second note "Re". The assumption here which needs to be made to realize Bharata Muni's shruti of first datum note being the sound of free string Sa, requires the assumption of 4 virtual shruties of Sa which are actually obtained in the higher octave after Ni. This assumption though not explicitly stated in the Natya Shastra needs to be made as was discovered by Avinash Balkrishna Patwardhan and is required to prove the Sarana Chatushtai experiment. The shruti distances as per the compression factors are calculated for all the 34" length of the string. 18 frets are required to reach up to the end note Ni of the saptak in both the instruments. When finally both the instruments are set in the Shadjagrama, one sitar is to be kept as "Achala" (Achala means that which does not change) i.e. the string tuning of this instrument remains unchanged during the entire experiment, whereas the other sitar is named as "Chala" i.e. the changes in tuning strings during the experiment are to be performed on this sitar (Chala means that which could change). The Panchama note of this Chala sitar is to be lowered by one "Pramana-Shruti" that is to bring this sitar in the Madhyamagrama. The procedure of Bharata states that the Achala sitar Re note is first played as Sa note and the Pa note of the Chala sitar is lowered down in sound to be played as Ma note of the Achala sitar's Re note(assumed as Sa note).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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