Bone conduction microphones

A bone conduction microphone, comprising:

• a laminated structure formed by a vibration unit and an acoustic transducer unit;
• and
• a base structure configured to load the laminated structure, at least one side of the laminated structure being physically connected to the base structure;
• wherein
• the base structure vibrates based on an external vibration signal, and the vibration unit deforms in response to the vibration of the base structure;
• and the acoustic transducer unit generates an electrical signal based on the deformation of the vibration unit, wherein a resonant frequency of the bone conduction microphone is within a range of 2.5 kHz-4.5 kHz;
• the vibration unit includes a suspension membrane structure, the suspension membrane structure is connected to the base structure through a circumferential side of the suspension membrane structure, and the acoustic transducer unit is located on an upper surface or a lower surface of the suspension membrane structure;
• wherein
• the acoustic transducer unit is a ring structure, and a thickness of the suspension membrane structure located in an inner region of the ring structure is greater than a thickness of the suspension membrane structure located in an outer region of the ring structure.