This is a device that can change the frequency of the sound. It works like a tone changer. It can increase the frequency of the sound signal by 5Hz, destroying the conditions that produce whistling, thus suppressing the whistling. However, the use of the device has certain limitations, and the use of the device in the language sound reinforcement is very effective, and the damage to the sound is small, but the use of the concert and the instrumental music will have a distinct sound-changing feeling. . This is because the lower limit frequency range of the language is between 130~350Hz. Only the pitch change of 5Hz will not make people have a clear feeling of high pitch, but the lower limit frequency of vocal and instrumental music is about 20Hz, the pitch change of 5Hz has been noticed clearly by the human ears.
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