Echo cancellation method for bone conduction earphone and bone conduction earphone

• Main Authors: SUN QINLONG, TANG GUOWEN
• Format: Patent
• Language: Chinese; English
• Published: 19.11.2021
• Subjects: DEAF-AID SETS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS; PUBLIC ADDRESS SYSTEMS

The invention relates to an echo cancellation method for a bone conduction earphone. The echo cancellation method comprises the following steps: respectively arranging a main microphone and an auxiliary microphone at different positions on the bone conduction earphone; inputting white noise directly facing the main microphone, and obtaining a pickup frequency response curve SPL10 of the main microphone; inputting white noise directly facing the auxiliary microphone, and obtaining a pickup frequency response curve SPL20 of the auxiliary microphone; calculating a frequency response difference curve SPL_NC of the main microphone and the auxiliary microphone, wherein SPL_NC=SPL10-SPL20; setting a bone conduction earphone head model, and outputting a sweep frequency signal of a fixed level B through an audio generator; acquiring a frequency response curve SPL10-1 of the main microphone for the sweep frequency signal and a frequency response curve SPL20-1 of the auxiliary microphone for the sweep frequency signal;