| 摘要 |
PURPOSE: To facilitate the hearing a received voice at a location with high noise. CONSTITUTION: A noise signal analysis means 3 receiving a surrounding noise from a transmitter 10 analyzes noise frequency and detects sound volume. According to the result of analysis, a reception sound adjustment means 1 adjusts the sound frequency and sound volume of a received voice signal to easily hear output voice of a receiver 9. When a talker utters a voice, that is, a transmission voice is received from the transmitter 10, a sound volume discrimination means 4 to prevent malfunction of analyzing the transmission voice as a noise and when a transmission voice input is started, a voice control means 2 stores the state of the reception sound adjustment just before to control the reception voice adjustment means 1. |
