Systems provide an audio/visual output to each of a plurality of listeners in a manner that permits individualized audio adjustment, wherein audio comprises a first signal that is substantially voice and a second signal that is substantially other than voice. The systems may include a video device, a...http://www.google.de/patents/US7337111?utm_source=gb-gplus-sharePatent US7337111 - Use of voice-to-remaining audio (VRA) in consumer applications
