Method for inducing brainwaves by sound and sound adjusting device

A sound adjusting device, which is signally connected with a speaker device, wherein the speaker device comprising a first speaker and a second speaker, the sound adjusting device comprising:

• a signal input terminal, used for receiving first channel input signal and a second channel input signal;
• a sound processing unit, which is electrically connected to the signal input terminal, the sound processing unit comprising:
• a sound adjustment module, which is used for adjusting a volume gain of the first channel input signal to form a first channel output signal, wherein a formal of the volume gain of the first channel output signal is in a first wave format;
• the sound adjustment module adjusting a volume gain of the second channel input signal to form a second channel output signal, wherein a formal of the volume gain of the second channel output signal is in a second wave format, wherein the type of the first wave format is the same as that of the second wave format;
• and
• a signal output terminal, which is electrically connected to the sound processing unit for outputting the first channel output signal to the speaker device and playing through the first speaker, and outputting the second channel output signal to the speaker device and playing through the second speaker, wherein a maximum of the volume gain of the first channel output signal is M1, a minimum of the volume gain of the first channel output signal is M2, and −200 dbFS≤M1−M2≤0 dbFS;
• the maximum of the volume gain of the second channel output signal is M1, the minimum of the volume gain of the second channel output signal is M2, and −200 dbFS≤M1−M2≤0 dbFS.