Shruthi

 Shruthi

In Carnatic music, shruti is the smallest interval of pitch that the human ear can detect and a musical instrument can produce. It is the foundation for creating melodies and ragas, and is considered to be the musical "pitch" or position of a note. Shruti is also known as the smallest frequency difference between any two notes that the ear can recognize.

śruti, (Sanskrit: “heard”), in the music of India and Pakistan, the smallest tonal interval that can be perceived. The octave, in Indian theory, is divided into 22 śrutis.

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https://www.youtube.com/watch?v=bkx9VDQ0BVY&list=PLEXR4iNvoBAjAmiqSZbLw8eczLyeCpcD2

https://www.sunadam.com/2016/03/14/introduction-to-shruti-the-foundational-pitch/

https://voxguru.in/blog/developing-a-good-sense-of-shruti