SOUND LEAKAGE REDUCTION AND ACOUSTIC OUTPUT DEVICES Russian patent published in 2023 - IPC H04R9/06 H04R1/28 

FIELD: acoustics.

SUBSTANCE: sound leakage reduction device includes an energy conversion structure, a vibration structure, and a housing. The housing comprises a vibration cavity and at least one resonant cavity. The acoustic transducer is located in the vibration cavity and is connected to the vibration structure. The resonant cavity communicates with the vibration cavity through one connection hole. The volume of each resonant cavity may be less than the volume of the vibration cavity. In this case, the volume ratio between the volume of each resonant cavity and the volume of the vibration cavity is at least 0.1.

EFFECT: reduced sound leakage into outer space.

9 cl, 18 dwg