Piezoelectric microphones
View Patent ↗Electronic devices and microphone devices are described.
1. A microphone device, comprising:
a first microphone disposed over a substrate and adapted to receive audio signals primarily from a first direction; and
a second microphone disposed over the substrate and adapted to receive audio signals primarily from a second direction, wherein the first direction and the second direction are opposing, wherein the first microphone comprises a first film bulk acoustic (FBA) structure and the second microphone comprises a second FBA structure.
2. A microphone device as claimed in claim 1 , further comprising a plurality of microphones.
3. A microphone device as claimed in claim 1 , wherein the audio signals from the first direction are speech signals and the audio signals from the second direction are ambient noise signals.
4. A microphone device as claimed in claim 3 , wherein the ambient noise signals are used to provide noise cancellation to an output signal of the first microphone.
5. A microphone device as claimed in claim 1 , wherein the audio signals from the first and second directions are speech signals.
6. A microphone device as claimed in claim 1 , wherein the substrate is disposed in a package.
7. A microphone device as claimed in claim 6 , wherein the package further comprises an acoustic barrier disposed between the first and the second microphones.
8. A microphone device as claimed in claim 6 , wherein the package includes a first sound input adapted to receive the audio signals from the first direction and a second sound input adapted to receive the audio signals from the second direction.
9. A microphone device as claimed in claim 1 , further comprising a cap structure over the second microphone, wherein the cap structure substantially isolates the second microphone from audio signals from the first direction.
10. A microphone device, comprising:
a first microphone comprising a first film bulk acoustic (FBA) device, wherein the first microphone is adapted to receive audio signals primarily from a first direction; and
a second microphone comprising a second FBA device, wherein the second microphone device is adapted to receive audio signals primarily from a second direction, wherein the first direction and the second direction are opposing.
11. A microphone device as claimed in claim 10 , further comprising at least a third microphone comprising a third FBA device.
12. A microphone device as claimed in claim 10 , wherein the audio signals from the first direction are voice signals and the audio signals from the second direction are ambient audio noise signals.
13. A microphone device as claimed in claim 10 , wherein the audio signals from the first and second directions are voice signals.
14. A microphone device as claimed in claim 10 , wherein the first microphone is disposed over a first substrate, and the second microphone is disposed over a second substrate.