Patent ID: 6928168
Filing Date: 2005-08-09
Classification: H04S

Abstract:
1. An audio system for spatially widening a stereophonic sound stage provided by at least two loudspeakers without introducing substantial spectral coloration effects, the system comprising: a pair of left and right loudspeakers to provide a stereophonic audio output, the left and right loudspeakers being spaced apart from one another; each of said loudspeakers having a single driver; a left channel audio input for inputting a left channel of an audio signal from an audio source to the left loudspeaker over a first direct signal path; a right channel audio input for inputting a right channel of an audio signal from the audio source to the right loudspeaker over a second direct signal path; a first filter stage along the first direct signal path intermediate the left channel audio input and the left loudspeaker for introducing a delay to the left channel of the audio signal before the left channel is output at the left loudspeaker; a second filter stage along the second direct signal path intermediate the right channel audio input and the right loudspeaker for introducing the delay to the right channel of the audio signal before the right channel is output at the right loudspeaker; a third filter stage intermediate the left channel audio input and the right loudspeaker along a first indirect signal path for adding a first low frequency cross-talk at frequencies below approximately 2 kHz derived from the left channel audio input to the delayed right channel of the audio signal; and a fourth filter stage intermediate the right channel audio input and the left loudspeaker along a second indirect signal path for adding a second low frequency cross-talk at frequencies below approximately 2 kHz derived from the right channel audio input to the delayed left channel of the audio signal.