Abstract: A mobile communication apparatus usable for voice communication exchanging a received sound and a spoken sound is provided. The mobile communication apparatus includes a first section, a second section movably connected to the first section in an ordinary mechanical mode or an extra mechanical mode, a detector configured to detect the mechanical mode, a speaker included in the first section and configured to produce the received sound, and a microphone included in the second section and configured to pick up the spoken sound. The mobile communication apparatus includes an echo canceller configured to cancel an echo caused by leakage of the received sound, an AGC circuit configured to produce a gain-controlled signal, and a controller configured to provide the AGC circuit with a first input/output characteristic and a second input/output characteristic in the ordinary mechanical mode and in the extra mechanical mode, respectively.

Abstract: A mobile communication apparatus usable for voice communication exchanging a received sound and a spoken sound is provided. The mobile communication apparatus includes a first section, a second section movably connected to the first section in an ordinary mechanical mode or an extra mechanical mode, a detector configured to detect the mechanical mode, a speaker included in the first section and configured to produce the received sound, and a microphone included in the second section and configured to pick up the spoken sound. The mobile communication apparatus includes an echo canceller configured to cancel an echo caused by leakage of the received sound, an AGC circuit configured to produce a gain-controlled signal, and a controller configured to provide the AGC circuit with a first input/output characteristic and a second input/output characteristic in the ordinary mechanical mode and in the extra mechanical mode, respectively.