Emotion adjustment system and emotion adjustment method

An emotion adjustment method, comprising:

• receiving, by a microphone, a user's voice;
• extracting, by a controller, a plurality of sound quality factors in response to processing the user's voice;
• calculating, by the controller, a depression index of the user based on at least one sound quality factor among the plurality of sound quality factors;
• identifying, by the controller, an emotional state of the user as a depressive state when the depression index is a preset value or more;
• determining, by the controller, the depressive state as a first state or a second state based on a correlation between at least two sound quality factors among the plurality of sound quality factors;
• transmitting, by the controller, a control command corresponding to the emotional state of the user identified as the first state or the second state;
• and
• performing, by a feedback device, an operation corresponding to the control command,
• wherein the plurality of sound quality factors comprises a sharpness, a roughness, and a fluctuation strength,
• wherein determining the depressive state as the first state or the second state comprises:
• calculating a noise index of the user's voice based on a correlation between the sharpness, the roughness, and the fluctuation strength;
• and
• determining the depressive state as the first state or the second state based on the noise index,
• wherein the noise index comprises a rattle index and a squeak index, and
• wherein determining the depressive state as the first state or the second state based on the noise index comprises:
• determining the depressive state as the first state or the second state based on a ratio between the rattle index and the squeak index.