| 摘要 |
Communications equipment is tested for perceptually relevant distortions introduced by the equipment by generating indications of the extent to which such distortion would be perceptible to a human observer, and processing high-level application data received with the input stimulus and/or generated locally relating to the intended content of the input stimulus. This allows the perceptual relevance of different distortion types to be weighted in the final output from the perceptual layer according to the nature of the signal being transmitted. The high-level information may be of a general nature, defining the type of information content in the input signal (e.g. music or speech) or may be highly defined, e.g. the input signal accompanying a video input specifying which of a limited set of objects in a virtual world is to be depicted, such that a reference copy of the image, or characteristic features of such objects can be retrieved from a store. The high-level application data may be used for other purposes, e.g. to select a coding process suitable for the nature of the information content.
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