| 摘要 |
A communication apparatus comprises a sound volume controller in which a speech signal is discriminated from background noise of a transmitting audio signal and the sound volume control is performed when no speech signal is present in the transmitting audio signal. The sound volume controller comprises an averaging circuit for averaging an amplitude of the transmitting audio signal, a discriminator for discriminating a speech signal of the transmitting audio signal by comparing the transmitting audio signal with the averaged amplitude, and a controller for controlling an amplitude of a receiving audio signal when no speech signal is present in the transmitting audio signal. A level of the averaged amplitude is determined by comparing the averaged amplitude with at least one predetermined reference level, and the amplitude of the receiving audio signal is varied according to the level of the averaged amplitude when no speech signal is present.
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