Signal processing method and device of mems microphone and mems microphone
A signal processing method and device of a MEMS microphone and a MEMS microphone are disclosed. The method comprises: acquiring a first electrical signal obtained by converting a received optical signal by an optical sensor disposed near a sound hole of the MEMS microphone; acquiring a second electrical signal output by the MEMS microphone; and judging that the second electrical signal is an interference signal when within a substantially overlapping time range, the first electrical signal acquired reaches a preset first threshold value and the second electrical signal acquired meets a preset condition.
1. A signal processing method of a MEMS microphone, comprising:
acquiring a first electrical signal obtained by converting a received optical signal by an optical sensor disposed near a sound hole of the MEMS microphone;
acquiring a second electrical signal output by the MEMS microphone; and
judging that the second electrical signal is an interference signal when within a substantially overlapping time range, the first electrical signal acquired reaches a preset first threshold value and the second electrical signal acquired meets a preset condition.
2. The method according to claim 1 , wherein the preset condition that the second electrical signal meets comprises:
the second electrical signal reaches a preset second threshold value.
3. The method according to claim 1 , wherein the preset condition that the second electrical signal meets comprises:
performing speech recognition on the second electrical signal and obtaining a preset control instruction.
4. The method according to claim 3 , further comprising:
prohibiting execution of the preset control instruction.
5. The method according to claim 1 , wherein the step of judging that the second electrical signal is an interference signal when within a substantially overlapping time range, the first electrical signal acquired reaches a preset first threshold value and the second electrical signal acquired meets a preset condition comprises:
synchronously acquiring the first electrical signal and the second electrical signal;
starting time counting when the first electrical signal acquired at a same time point reaches a preset first threshold value and the second electrical signal acquired at the same time point reaches a preset second threshold value; and
judging that the second electrical signal is an interference signal when speech recognition is performed on the second electrical signal and a preset control instruction is obtained within a preset time period.
6. The method according to claim 5 , wherein the step of judging that the second electrical signal is an interference signal when speech recognition is performed on the second electrical signal and a preset control instruction is obtained within a preset time period comprises:
judging whether the second electrical signal matches a preset speech recognition model; and
if yes, determining that the speech recognition is performed on the second electrical signal and the preset control instruction is obtained.
7. The method according to claim 6 , further comprising:
shielding the interference signal.
8. The method according to claim 6 , further comprising:
prohibiting execution of the preset control instruction.
9. The method according to claim 5 , further comprising:
shielding the interference signal.
10. The method according to claim 5 , further comprising:
prohibiting execution of the preset control instruction.
11. The method according to claim 1 , further comprising:
shielding the interference signal.
12. The method according to claim 1 , further comprising:
outputting the second electrical signal when the first electrical signal does not reach the preset first threshold value.
13. A signal processing device of a MEMS microphone, comprising: a processor and a memory, wherein the memory stores computer instructions, and when the computer instructions are run by the processor, the method according to claim 1 is executed.
14. The signal processing device according to claim 13 , wherein the preset condition that the second electrical signal meets comprises:
the second electrical signal reaches a preset second threshold value.
15. The signal processing device according to claim 13 , wherein the preset condition that the second electrical signal meets comprises:
performing speech recognition on the second electrical signal and obtaining a preset control instruction.
16. The signal processing device according to claim 13 , wherein the step of judging that the second electrical signal is an interference signal when within a substantially overlapping time range, the first electrical signal acquired reaches a preset first threshold value and the second electrical signal acquired meets a preset condition comprises:
synchronously acquiring the first electrical signal and the second electrical signal;
starting time counting when the first electrical signal acquired at a same time point reaches a preset first threshold value and the second electrical signal acquired at the same time point reaches a preset second threshold value; and
judging that the second electrical signal is an interference signal when speech recognition is performed on the second electrical signal and a preset control instruction is obtained within a preset time period.
17. A signal processing device of a MEMS microphone, comprising:
a first acquisition module for acquiring a first electrical signal obtained by converting a received optical signal by an optical sensor disposed near a sound hole of the MEMS microphone;
a second acquisition module for acquiring a second electrical signal output by the MEMS microphone; and
a judgment module for judging that the second electrical signal is an interference signal when within a substantially overlapping time range, the first electrical signal acquired reaches a preset first threshold value and the second electrical signal acquired meets a preset condition.