US Patent 8744069 Removing near-end frequencies from far-end sound

By-bandwidth voice-switching is performed during doubletalk between a near-end teleconference device and a far-end teleconference device. This may involve receiving far-end voice data from the far-end teleconference device. Near-end voice data is also received at the near-end teleconference device. Frequency subbands of the near-end voice data that having substantial energy are identified. Before playing the far-end voice data on one or more loudspeakers of the near-end teleconference device, frequency subbands from the far-end voice data frequency subbands thereof that correspond to the identified frequency subbands of the near-end voice data are attenuated and/or eliminated.