Its function is to raise the high frequency and low frequency sound when the volume is low. Since the human ear has poor hearing sensitivity to high frequency sound, especially low frequency sound, it is required to perform auditory compensation for high frequency and low frequency at low volume, that is, it requires a large increase in low frequency and a certain increase in high frequency. In other words, when the volume is reduced, the decrease in the low frequency portion of the signal is less in the higher frequency portion. Equal loudness control satisfies this requirement, and equal loudness control is generally 8dB or 10dB.
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