| 摘要 |
In order to adaptively control the level of an alarm which warns of imminent or impending communication interruption, an error information signal and data frame energy, which are both derived during the decoding of an incoming signal, are used. If the incoming signal is deteriorated to an extent that communication interruption is imminent, an alarm signal is issued and superimposed on a voice signal. The level of the alarm signal is controlled in accordance with the detected frame energy.
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