| 摘要 |
<p>An audio enhancement system (20) and method of use with a sound system for producing primary sound from at least one main loudspeaker (23) located at a main position. The audio enhancement system (20) comprises at least one wireless transmitter (30-N), time delay circuitry (36-N), and plural augmented sound producing subsystems (32-N). Each sound subsystem (32-N) is a portable unit arranged to be carried by a person located remote from the main loudspeaker (23) and includes a wireless receiver (48) and an associated transduce device, e.g., a pair of stereo headphones (60). The transmitter broadcasts an electrical signal which is representative of the electrical input signal provided to the main loudspeaker (23). The broadcast signal is received by the receiver (48) and is demodulated and amplified to drive the transducer (60 or 62) so that it produces augmented sound substantially in synchronism wit the sound arriving from the main loudspeaker (23). To achieve that end the time delay circuitry (36-N) delays the electrical signal which is provided to the transducer (60 or 62) for a predetermined period of time corresponding generally to the time period it takes for the primary sound to propagate through the air from the main loudspeaker (23) to the remote location at which the person is located.</p> |
