Acoustic input-output devices

An acoustic input-output device, comprising:

• a loudspeaker assembly configured to transmit sound waves by generating a first mechanical vibration;
• and
• a microphone configured to receive a second mechanical vibration of a voice signal source that is generated when the voice signal source provides a voice signal, the microphone generating a first signal and a second signal in response to the first mechanical vibration and the second mechanical vibration, respectively, wherein in a specific frequency range, a ratio of an intensity of the first mechanical vibration to an intensity of the first signal is greater than a ratio of an intensity of the second mechanical vibration to an intensity of the second signal;
• wherein
• a first angle formed by a vibration direction of the microphone and a direction of the first mechanical vibration is within a set angle range, and the first angle is within an angle range of 20 degrees to 90 degrees.