Women are said to have a shrill and high-pitched voice, whereas men produce a flat and low-pitched sound.
This is due to their shorter vocal cords. Thus, the pitch is directly related to frequency, and frequency is the number of vibrations in one second.
The higher the frequency, the more shrill and high-pitched is the sound produced.
For example, the sound produced by a flute is more shrill than the sound produced by a drum, tabla or dholak. The sound produced by a jet plane has a high pitch because of the high frequency of its rotating blades.
Frequency and pitch are related to each other. The higher the pitch and the more shrill the sound
Hence, Shrill is another word for high-pitched sound.