Abstract: A transmitter modulates an input voice signal to transmit an RF signal. A receiver demodulates a received RF signal to output an output voice signal. A voice level comparator compares a level of an input voice signal obtained by collecting a voice by a microphone with a VOX sensitivity level. A transmission determination unit instructs the transmitter to transmit the input voice signal, when the level of the input voice signal is equal to or greater than the VOX sensitivity level, based on a comparison result by the voice level comparator. A VOX sensitivity level calculator calculates the VOX sensitivity level in a predetermined period until just before the receiver completes outputting the output voice signal, based on an ambient sound collected by the microphone.

Abstract: A transmitter modulates an input voice signal to transmit an RF signal. A receiver demodulates a received RF signal to output an output voice signal. A voice level comparator compares a level of an input voice signal obtained by collecting a voice by a microphone with a VOX sensitivity level. A transmission determination unit instructs the transmitter to transmit the input voice signal, when the level of the input voice signal is equal to or greater than the VOX sensitivity level, based on a comparison result by the voice level comparator. A VOX sensitivity level calculator calculates the VOX sensitivity level in a predetermined period until just before the receiver completes outputting the output voice signal, based on an ambient sound collected by the microphone.

Abstract: A spectrum analyzer is configured to display, on a display, reception signal intensity of each of multiple frequencies. A smoothing unit is configured to smooth signal intensity data of each of the multiple frequencies to produce smoothed data. A peak frequency detection unit is configured to detect, as a peak frequency, a frequency at a position indicating a maximum value in the smoothed data closest to a contact position that a touch sensor detects. A reception frequency determination unit is configured to determine a reception frequency of a radio wave that a receiver for a voice call receives based on the peak frequency.

Abstract: A spectrum analyzer is configured to display, on a display, reception signal intensity of each of multiple frequencies. A smoothing unit is configured to smooth signal intensity data of each of the multiple frequencies to produce smoothed data. A peak frequency detection unit is configured to detect, as a peak frequency, a frequency at a position indicating a maximum value in the smoothed data closest to a contact position that a touch sensor detects. A reception frequency determination unit is configured to determine a reception frequency of a radio wave that a receiver for a voice call receives based on the peak frequency.