Acoustic vibration sensor
An acoustic vibration sensor, also referred to as a speech sensing device, is provided. The acoustic vibration sensor receives speech signals of a human talker and, in response, generates electrical signals representative of human speech. The acoustic vibration sensor includes at least one diaphragm positioned adjacent to a front port and at least one coupler. The coupler couples a first set of signals to the diaphragm while isolating the diaphragm from the second set of signals. The coupler includes at least one material with acoustic impedance matched to the acoustic impedance of human skin.
1. A sensor for generating electrical signals, comprising:
at least one diaphragm positioned adjacent a front port; and
at least one coupler configured to couple a first set of signals to the diaphragm and reject a second set of signals by isolating the diaphragm from the second set of signals, wherein the coupler includes at least one material having an acoustic impedance matched to an impedance of human skin.
2. The sensor of claim 1 , wherein the coupler is coupled to skin of a human talker and the first set of signals include speech signals of the talker and the second set of signals include noise of an airborne acoustic environment of the talker.
3. The sensor of claim 1 , wherein the coupler includes a first protrusion on a first side of the coupler that contacts a surface of the human skin and a second protrusion on a second side of the coupler that contacts the diaphragm.
4. The sensor of claim 1 , wherein a first side of the coupler contacts the human skin and a second side of the coupler couples to the diaphragm via at least one layer of gel material.
5. The sensor of claim 1 , wherein the coupler comprises at least one material including at least one of silicone gel, dielectric gel, thermoplastic elastomers (TPE), and rubber compounds.
6. The sensor of claim 1 , further comprising electret material coupled to receive acoustic signals from the talker via the coupler and the diaphragm, wherein the electret material is used to convert the acoustic signals to the electrical signals.
7. An acoustic sensor, comprising:
a first port on a first side of an enclosure;
a second port on a second side of an enclosure;
at least one diaphragm positioned between the first and second ports; and
a contiguous coupler having a first portion that couples a first side of the diaphragm to skin of a human talker and a second portion that isolates the first side of the diaphragm from an airborne acoustic environment of the human talker, wherein the coupler includes at least one material having an acoustic impedance matched to the impedance of skin.
8. The sensor of claim 7 , further comprising electret material coupled to receive acoustic signals from the talker via the coupler and the diaphragm, wherein the electret material is used to convert the acoustic signals to electrical signals.
9. The sensor of claim 7 , wherein the coupler comprises at least one material including at least one of silicone gel, dielectric gel, thermoplastic elastomers (TPE), and rubber compounds.
10. The sensor of claim 7 , wherein the coupler includes a contact device comprising a first side that contacts the skin and a second side that contacts the diaphragm.
11. The sensor of claim 7 , wherein the second port couples a second side of the diaphragm to the airborne acoustic environment.
12. A communication system, comprising:
at least one signal processor; and
at least one acoustic sensor that couples electrical signals representative of human speech to the signal processor, the sensor including at least one diaphragm positioned between a first port and a second port of an enclosure, the sensor further including a contiguous coupler comprising at least one material having an acoustic impedance matched to the impedance of skin, wherein the coupler includes a first portion that couples a first side of the diaphragm to skin of a human talker and a second portion that isolates a first side of the diaphragm from an airborne acoustic environment of the human talker.
13. The system of claim 12 , further including a portable communication device that includes the acoustic sensor, wherein the portable communication device includes at least one of cellular telephones, satellite telephones, portable telephones, wireline telephones, Internet telephones, wireless transceivers, wireless communication radios, personal digital assistants (PDAs), personal computers (PCs), headset devices, head-worn devices, and earpieces.