Microphone
The present disclosure provides a microphone, comprising a vibration pickup assembly configured to generate vibration; at least two acoustoelectric conversion elements configured to respectively receive the vibration of the vibration pickup assembly to generate an electrical signal; at least one sampling module configured to convert electrical signals output by different acoustoelectric conversion elements of the at least two acoustoelectric conversion elements into digital signals, wherein, each of the at least two acoustoelectric conversion element has a resonant frequency, and a difference between resonant frequencies of two of the at least two acoustoelectric conversion elements is greater than 1000 Hz.
1. A microphone, comprising:
a vibration pickup assembly configured to generate vibration;
at least two acoustoelectric conversion elements configured to respectively receive the vibration of the vibration pickup assembly to generate an electrical signal;
at least one sampling module configured to convert electrical signals output by different acoustoelectric conversion elements of the at least two acoustoelectric conversion elements into digital signals, wherein,
each of the at least two acoustoelectric conversion element has a resonant frequency, and a difference between resonant frequencies of two of the at least two acoustoelectric conversion elements is greater than 1000 Hz; and
a shell structure, wherein the vibration pickup assembly is accommodated in the shell structure and generates the vibration in response to an external sound signal transmitted to the shell structure, and the vibration pickup assembly is connected with the shell structure through a peripheral side of the vibration pickup assembly.
2. The microphone of claim 1 , wherein the difference between the resonant frequencies of two of the at least two acoustoelectric conversion elements is greater than 3000 Hz.
3. The microphone of claim 1 , wherein the at least one sampling module uses different sampling frequencies to sample the electrical signals output by different acoustoelectric conversion elements.
4. The microphone of claim 1 , wherein a count of sub-bands corresponding to the at least two acoustoelectric conversion elements is no less than 5.
5. The microphone of claim 1 , wherein the vibration pickup assembly and the shell structure define at least one acoustic cavity, the at least one acoustic cavity includes a first acoustic cavity;
the shell structure includes at least one hole, the at least one hole is located at the first acoustic cavity, and the at least one hole guides the external sound signal into the first acoustic cavity,
wherein the vibration pickup assembly vibrates in response to a sound signal in the first acoustic cavity, and the at least two acoustoelectric conversion elements respectively receive the vibration of the vibration pickup assembly to generate the electrical signal.
6. The microphone of claim 1 , wherein the vibration pickup assembly generates vibration in response to a vibration of the shell caused by the external sound signal.
7. The microphone of claim 6 , wherein the vibration pickup assembly includes a first vibration pickup assembly, and the at least two acoustoelectric conversion elements are connected with the first vibration pickup assembly directly or indirectly.
8. The microphone of claim 6 , wherein the vibration pickup assembly includes a first vibration pickup assembly and a second vibration pickup assembly sequentially arranged from top to bottom, and the first vibration pickup assembly and the second vibration are connected with the shell structure through a peripheral side, the first vibration pickup assembly, the second vibration, and the shell structure defines a cavity, wherein at least partial structure of the first vibration pickup assembly and the second vibration pickup assembly generate vibration in responses to the external sound signal.
9. The microphone of claim 8 , wherein a vibration transmission assembly in a tubular structure is arranged between the first vibration pickup assembly and the second vibration pickup assembly, wherein the vibration transmission assembly, the first vibration pickup assembly, and the second vibration pickup assembly defines a cavity.
10. The microphone of claim 6 , wherein the vibration pickup assembly includes a first vibration pickup assembly, a second vibration pickup assembly, and a third vibration pickup assembly, the first vibration pickup assembly and the second vibration pickup assembly are set opposite to each other, a vibration transmission assembly in a tubular structure is arranged between the first vibration assembly pickup assembly and the second vibration pickup assembly, the vibration transmission assembly, the first vibration pickup assembly, and the second vibration pickup assembly defines a cavity;
the third vibration pickup assembly is connected between the vibration transmission assembly and an inner wall of the shell structure,
wherein the third vibration pickup assembly generates vibration in response to the external sound signal.
11. The microphone of claim 1 , wherein each acoustoelectric conversion element includes a cantilever beam structure, the cantilever beam structure is deformed based on a vibration signal to convert the vibration signal into an electrical signal.
12. The microphone of claim 11 , wherein different cantilever beam structures are distributed at intervals in the shell.
13. The microphone of claim 11 , wherein a size or material of the cantilever beam structure corresponding to each of the at least two acoustoelectric conversion elements is different.
14. The microphone of claim 13 , wherein the at least two acoustoelectric conversion elements include a first cantilever beam structure and a second cantilever beam structure, a length of the first cantilever beam in a direction perpendicular to a vibration direction of the first cantilever beam is greater than a length of the second cantilever beam in a direction perpendicular to a vibration direction of the second cantilever beam, and a resonant frequency corresponding to the first cantilever beam is lower than a resonant frequency corresponding to the second cantilever beam.
15. The microphone of claim 13 , wherein the at least two acoustoelectric conversion elements include a first cantilever beam structure and a second cantilever beam structure, a stiffness of the first cantilever beam structure is different from a stiffness of the second cantilever beam structure.
16. The microphone of claim 11 , wherein the cantilever beam structure is a piezoelectric cantilever beam.
17. The microphone of claim 1 , wherein each acoustoelectric conversion element includes a first cantilever beam structure and a second cantilever beam structure, the first cantilever beam structure is arranged opposite to the second cantilever beam structure, and the first cantilever beam structure and the second cantilever beam structure have a first distance, wherein the first distance between the first cantilever beam structure and the second cantilever beam structure changes based on a vibration signal to convert the vibration signal into an electrical signal.
18. The microphone of claim 1 , wherein the microphone includes at least one membrane structure, wherein the at least one membrane structure is located on an upper surface or a lower surface of the at least two acoustoelectric conversion elements.
19. The microphone of claim 1 , wherein the microphone includes at least one supporting structure, one end of the at least one supporting structure is connected with a first vibration pickup assembly of the vibration pickup assembly, and another end of the at least one supporting structure is connected with a second vibration pickup assembly of the vibration pickup assembly, and a free end of the at least two acoustoelectric conversion elements and the supporting structure have a second distance.