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 receiving apparatus comprises an audio output unit, a volume operating unit outputting an operating value indicating a volume level of the audio according to a user operation, a lock controller switching between a non-locked state in which the volume level of the audio can be varied and a locked state in which the volume level is fixed, and a volume controller causing the audio output unit to output the audio having a volume level corresponding to the operating value in the non-locked state and the audio having a volume level corresponding to the lock value in the locked state, and switching the locked state to the non-locked state for a period of time on turning on a predetermined operating part and updating the lock value with the operating value, and switching the non-locked state to the locked state on turning off the predetermined operating part.

Abstract: A receiving apparatus comprises an audio output unit, a volume operating unit outputting an operating value indicating a volume level of the audio according to a user operation, a lock controller switching between a non-locked state in which the volume level of the audio can be varied and a locked state in which the volume level is fixed, and a volume controller causing the audio output unit to output the audio having a volume level corresponding to the operating value in the non-locked state and the audio having a volume level corresponding to the lock value in the locked state, and switching the locked state to the non-locked state for a period of time on turning on a predetermined operating part and updating the lock value with the operating value, and switching the non-locked state to the locked state on turning off the predetermined operating part.