H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 1/40 (2006.01) H04B 15/00 (2006.01) H04M 9/08 (2006.01)
Patent
CA 2048650
A unique speakerphone for cellular telephones includes in the transmit audio path between microphone 112 and transmitter 118, a transmitter mute switch which disconnects the audio path to the transmitter from the microphone 112, and a transmit gain amplifier that is controlled to lower the feedback the microphone can pickup from the speaker 110. In the feedback path to the radiotelephone receiver 120 from the cellular base station 122 and the land line telephone system 124, the speakerphone includes the controlled amplifier 106 which is fed into the speaker mute gate, and the speaker 110 to close the feedback loop. De-emphasized audio is sampled by the A/D 102 on both the microphone-to- transmitter side of the loop and the receiver-to-speaker side of the loop. The microcomputer 104 is able to detect and eliminate howl, as well as determine whether howl exists, from the A/D sampling.
Binzel Charles P.
Kromenaker Susan C.
Lefebvre James D.
Gowling Lafleur Henderson Llp
Motorola Inc.
LandOfFree
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