Abstract: An improved motorcycle intercom communications system between the motorcycle driver and passenger providing for stereo of listening from a radio, cassette player, or the like in each of both right and left helmet speakers wherein intercom communications may be had through microphones always activated located proximate the mouth of both driver and passenger, where when initiating speaking over the microphone, the stereo output of both right and left speakers of the driver's and passenger's helmets is terminated completely and the intercom conversation is heard in full. Upon the termination of the intercom conversation, the invention circuitry returns both sides of speakers to the pre-existing level of stereo output. The above is accomplished by dividing all sounds which come in over the microphone into a low frequency range and an audio speaking range wherein the output of a low frequency range filter is constantly sampled and compared with the energy output of the audio speaking range of frequencies.

Abstract: An improvement to motorcycle intercom communications between the motorcycle driver and passenger providing for stereo listening in each of both right and left helmet earphones wherein intercom communications may be had through microphones always activated located proximate the mouth of both driver and passenger where when initiating speaking over the microphone, the stereo output of one side of the earphones is reduced by approximately one/half while the stereo output of the other side earphones is terminated completely and the intercom conversation is heard in full over that single side of earphones. Upon the termination of the intercom conversation, the invention circuitry returns both sides of earphones to the pre-existing level of stereo output.