Acoustic porting for a portable communication device

1. A portable full duplex communication device, comprising:

a housing without external acoustical leak ports, the housing having a speaker and a microphone, the speaker having front and back surfaces; and

an earpiece enclosure having side walls and a back wall for enclosing the back surface of the speaker within the housing, the earpiece enclosure having an array of micro-ports on the back surface formed to minimize acoustic coupling between the speaker and the microphone.

2. The portable full duplex communication device of claim 1 , wherein the earpiece enclosure has an air volume of approximately 1 cubic centimeter (1 cc) and wherein each micro-port of the array of micro-ports has a diameter within 0.1 millimeters (mm) and 0.5 mm, each micro-port has a length within 0.1 mm and 0.5 mm, and wherein the array of micro-ports comprises between 10 and 100 micro-ports.

3. The portable full duplex communication device of claim 1 , further comprising:

a substrate within which is formed the array of micro-ports, the substrate comprising a material within which is formed the array of micro-ports to provide high mass inertance micro-ports.

4. The portable full duplex communication device of claim 3 , wherein the high mass inertance micro-ports have a predetermined range of parameters for a predetermined air volume.

5. The portable full duplex communication device of claim 4 , wherein the predetermined range of parameters comprises:

port diameter range, port length range, and number of ports range.

6. The portable full duplex communication device of claim 5 , the predetermined range of parameters provides echo minimization and a low audio frequency response, while the housing without external acoustical leak ports prevents fluid intrusion.

7. The portable full duplex communication device of claim 1 , wherein the array of micro-ports has a predetermined number and is dimensioned to have a predetermined length and a predetermined diameter drilled within a metal substrate to minimize echo between the speaker and the microphone while providing a predetermined low frequency response without the use of external acoustical leak ports on the housing.

8. The portable full duplex communication device of claim 1 , wherein the array of micro-ports comprises high mass inertance micro-ports.

9. The portable full duplex communication device of claim 1 , wherein the array of micro-ports comprises high mass inertance micro-ports forming an acoustic mass.

10. The portable full duplex communication device of claim 1 , wherein the array of micro-ports forms an acoustic mass.

11. The portable full duplex communication device of claim 10 , wherein the acoustic mass of the array of microports is a function of the length (L) and diameter (D) of the micro-ports.

12. A portable communication device, comprising:

a housing having an earpiece port and a microphone port;

a speaker coupled to the housing facing the earpiece port;

a microphone coupled to the housing facing the microphone port;

an earpiece enclosure comprising side walls and a back wall, the back wall having an aperture formed therein for mounting behind the speaker;

a substrate for mounting to the aperture of the earpiece enclosure, the substrate comprising an array of micro-ports; and

the array of micro-ports being formed to minimize echo between the speaker and the microphone while providing a predetermined low frequency response without the use of external acoustical leak ports on the housing.

13. The portable communication device of claim 12 , wherein the array of micro-ports is formed of high mass inertance micro-ports wherein the high mass inertance micro-ports are formed of a predetermined length and diameter.

14. The portable communication device of claim 12 , wherein each micro-port has a diameter within 0.1 millimeters (mm) and 0.5 mm and a length within 0.1 mm and 0.5 mm, and wherein the array of micro-ports comprises between 10 and 100 micro-ports.

15. The portable communication device of claim 14 , wherein the earpiece enclosure has an air volume of less than one cubic centimeter (1 cc).

16. The portable communication device of claim 12 , wherein the substrate having the array of micro-ports is insertable and removable from the earpiece enclosure.

17. The portable communication device of claim 12 , wherein the portable communication device is a full duplex communication device.

18. The portable communication device of claim 12 , wherein the substrate comprises metal substrate and the array of micro-ports formed therein are high mass inertance micro-ports formed of a predetermined number of ports, predetermined length and predetermined diameter.

19. The portable communication device of claim 12 , wherein the housing without external acoustical leak ports prevents fluid intrusion to the portable communication device.

20. A portable full duplex communication device, comprising:

a housing without external acoustical leak ports, the housing having a speaker and a microphone, the speaker having front and back surfaces; and

an earpiece enclosure having side walls and a back wall for enclosing the back surface of the speaker within the housing, the earpiece enclosure having an array of micro-ports on the back surface formed to minimize acoustic coupling between the speaker and the microphone, wherein the array of micro-ports is formed of a predetermined length and diameter, and wherein the predetermined diameter is 0.15 mm, and the predetermined length is 0.30 mm for an array of 40 micro-ports, and wherein the earpiece enclosure has an air volume of approximately one cubic centimeter (1 cc).

21. The portable full duplex communication device of claim 20 , wherein the housing without external acoustical leak ports prevents fluid intrusion to the portable full duplex communication device.