| 摘要 |
A speed search (playback) technique whereby the audio portion of a recording of a TV or radio broadcast or other recorded audio or video with audio that contains primarily speech can be played at several times the rate at which it was recorded without changing the pitch. By also playing only those portions of the speech that are the loudest or otherwise selected and skipping over the other sections, the listener can listen for key words that will identify the subject matter while listening to the audio at many times the normal rate. This technique can be used to provide a random access video recorder with a speed search feature in which the viewer will be able to listen to the audio as he/she speed-searches the video. It can also be used in a BVR (Buffered Video Recorder) to listen to the audio from the buffer at a faster rate so as to catch up to a live broadcast. It can also be used in this last mode to watch two broadcasts in the time it would take to watch just one by conventional means.
|
