| 摘要 |
<p>A sound reproduction system for converting stereo signals on two input channels (92, 94), which may have been directionally encoded from a four or five channel original, into signals for multiple output channels (172, 174, 176, 178, LS, RS), including decoding apparatus (90) for enhancing the directionally encoded component of the input signals in the desired direction and reducing the strength of such component in channels not associated with the encoded direction, while preserving both the maximum separation between the respective left and right channels and the total energy of the non-directionally encoded component of the input channels in each output channel, such that the instruments recorded on the right and left input channels stay on the right and left sides of the output channels, respectively, and the apparent loudness of all the instruments in all the output channels stays the same regardless of the direction of the directionally encoded component of the input signals.</p> |
