| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem in which audible noise having a frequency component of an audible range is generated when an electromagnetic wave emitted from a radio communication device that transmits in the form of a burst enters into an instrument through a cord or the like of an external microphone and a signal that is pseudo-envelope-detected by a voice amplifier circuit or the like mixes in a voice processing circuit.SOLUTION: To reduce audible noise while continuing radio communication, a reverse phase signal of the audible noise having a frequency component of an audible range is generated by a high frequency circuit of the own device by synchronizing with a transmission burst of a radio signal and added to an envelope-detected voice signal. |
