Multifunctional headphones for simultaneously listening to audio signal and ambient sound has control circuit that operates activation/deactivation units to automatically balance audio signals

摘要

Ear pieces are comprised of classis loudspeakers connected to a control circuit having an audio signal mixer whose input is connected to at least an audio line of a reproduction device and a microphone to catch environmental sound. An amplification stage reproduces the signals from the loudspeakers simultaneously. The control circuit is programmed to automatically balance the audio signals by operating activation/deactivation units.