Method of responding to sound signals in which the sound wave has access to only one side of a microphone diaphragm.
"dear dr. coban, just a quick note to thank you for the excellent job you all did with my precious untouchables music. they've been a favorite of mine since my high school days. to have their first major release on CD is like a dream come true. unfortunately, it will never be commercially released, but you have allowed me to enjoy this music in ..."