Abstract: In a portable electronic device with camera, a radio wave detection circuit detects specific radio waves, and when the radio wave detection circuit detects the specific radio waves, a control circuit prohibits close-up photography by a camera.

Abstract: Disclosed is a video/audio transmitter which frequency-converts a video input signal and an audio input signal into a signal on one channel in a frequency band for a television broadcast and transmits the frequency-converted video input signal and the frequency-converted audio input signal. The video/audio transmitter includes an antenna, an FM reception circuit, a frequency synthesizer, an FM reception circuit, a video transmission circuit, and an operation mode designation circuit. An unused channel among broadcast channels in other frequency bands is searched for using the FM reception circuit. Next, a video input signal and an audio input signal are frequency-converted into a signal in a searched unused channel.

Abstract: In a portable electronic device with camera, a radio wave detection circuit detects specific radio waves, and when the radio wave detection circuit detects the specific radio waves, a control circuit prohibits close-up photography by a camera.