The present invention provides an anti-snoring device based on an expansion type silencer, and proposes the technical solution from the respective of eliminating the effect in the causality of snoring. The anti-snoring device comprises an expansion chamber, a tube, and an active noise elimination module. The expansion chamber is connected to the active noise elimination module. The active noise elimination module further comprises a secondary sound source, a microphone, and a control module. The expansion chamber further comprises an opening for sealing and shielding the mouth and nose organ and forming an acoustic system of the expansion type silencer together with the sealed and shielded face skin. The tube is a respiratory airflow channel, and is an acoustic device having acoustic impedance different from that of the expansion chamber. In this way, the anti-snoring device provided in the utility model has the beneficial effects of being wide in applicability, large in noise elimination amount, wide in noise elimination bandwidth, small in size, light in weight, and low in electric energy consumption.

[Problem] To provide a technology capable of suppressing sound leakage to the outside of a room even when a user listens to audio in the room at a preferred sound volume. [Solution] This multi-channel audio device 1 performs sound output on audio playback signals from channels through respective playback speakers 2, and performs sound output on antiphase signals of the audio playback signals through an antiphase speaker 3. The attenuation rates and the delay times of the audio playback signals output from the respective playback speakers 2 at the installation position of the antiphase speaker 3 are stored in advance, and during the audio playback, the antiphase signals of the audio playback signals of the respective channels are attenuated on the basis of the respective attenuation rates, are delayed on the basis of the respective delay times, and are output as sound from the antiphase speaker 3.