ස්‍රැති (සංගීතය)
ශ්‍රුති ( සංස්කෘත "ඇසූ දෙය", "ශබ්ද " ; śruti ලෙසද ලියා ඇත) යනු ඉන්දියානු සම්භාව්‍ය සංගීතයේ සුසර කිරීමේ පද්ධතියේ කුඩාම විරාමය යි.

Shruti types 
Canonically there are 22 shrutis in an octave although systems with more or fewer śruti have been proposed. Here they are given in terms of just intonation, although many authors assume schismatic temperament implicitly.

There are infinite ratios, and therefore kinds of shrutis, in Indian music as there is full freedom; yet the classical values described are

 Chatuh shruti : 9/8
 Tri shruti : 10/9
 Dwi shruti : 16/15
 Single or Mono shruti (pramana shruti): 81/80.

Furthermore, there are Antar-shruti which give distances between two Swaras (notes):

 2:1 is taken as distance from S to S' (or r to r', R to R', g to g', etc.), and was placed on "4th śruti"
 3:2 is taken as distance from S to P (i.e. fro 1st to 5th tone), and was placed on "17th śruti"
 4:3 is taken as distance from S to m, and was placed on "13th śruti"
 5:4 is taken as distance from S to G, and was placed on "9th śruti"
 6:5 is taken as distance from S to g, and was called teevra in old ages as moving Ga towards Re makes Re shuddha.

Shrutis in Hindustani Music 
The table lists the 22 shrutis canonically defined in Hindustani music, defined as intervals from the swara Shadja. Shadja is assumed to be equivalent to the note A. Their width is given as frequency ratio or in cents. A comparison with intervals in Western music (5-limit tuning) is also provided.

This table does not reflect contemporary Indian point of view on Srutis in Hindustani music.

Further reading 
 Lentz, Donald A. Tones and Intervals of Hindu Classical Music. University of Nebraska-Lincoln, 1961.
 Deva, B Chaitanya The Music of India: A Scientific Study.
 Rao, Suvarnalata Acoustical Perspective on Raga Rasa Theory.

References

External links 
 http://www.22shrutiharmonium.com A 22-shruti harmonium by Dr. Vidyadhar Oke
 www.soundofindia.com Article on shrutis by Jeyanthe Ratnakumar
 Sound samples of Indian shrutis and their names
 A software implementation of 22 Srutis with 12 Indian Classical Instruments

සංගීතය