Patent ID: 8463334
Filing Date: 2013-06-11
Classification: H04M

Abstract:
1. A telephone mouthpiece for use in a wireless telephone, the telephone mouthpiece comprising: an enclosure having a front wall with a plurality of through-holes formed therein to permit an acoustic signal to pass into the enclosure; a microphone having a front surface spaced apart from the front wall, the microphone fixed within the enclosure for converting the acoustic signal to an electrical signal, and a microphone boot configured to support the microphone within the enclosure, the microphone boot having a front portion defining an air cavity within the enclosure and adjacent the front wall, wherein the air cavity and plurality of through-holes are sized to cause the telephone mouthpiece to have a passband in a frequency range of 200 Hertz (Hz) to 7000 Hz, wherein the mouthpiece passband has a substantially linear response within a linear range of the mouthpiece such that at a first frequency within the passband, a change in the input sound pressure level S wherein the mouthpiece passband varies less than 3 dB in gain across the frequency range of 200 Hz to 7000 Hz, wherein the mouthpiece is coupled to a wideband codec and the wideband codec is coupled to a wideband vocoder, wherein the air cavity and the through-holes are sized to cause the telephone mouthpiece to have an acoustic resonance that is outside of the frequency range of 200 Hz to 7000 Hz and at least some of the plurality of through-holes have a through-length approximately equal to 1.5 millimeters and a diameter approximately equal to 1.0 millimeter.