| 摘要 |
The environment surrounding an end-user device is analyzed. When a user of the device requests a download of a media presentation, the device uses the results of the environmental analysis to automatically request an alternative audio or video track for the media presentation. By choosing a better alternative before the download even begins, the device avoids user frustration and conserves resources. For example, a user requests a music video to be played on his mobile phone. By using its microphone, the phone analyzes its current audio environment and concludes that there is considerable background noise. Then when requesting a download of the music video, the phone requests an "enhanced-clarity" soundtrack to increase the odds that its user will be able to hear the music over the background noise. In some situations, the alternative track is rendered in addition to, rather than instead of, the default tracks of the media presentation.
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