August 1999
Intermediate to advanced
328 pages
8h 50m
English
Content preview from Voice Over IPBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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EVALUATING CODERS
In evaluating the performance of codecs, several factors come into play. A summary of these factors is shown in this list:
Frame size: Frame size represents the length of the voice traffic measured in time. It is also called frame delay. Frames are discrete parts of the speech, and each frame is updated based on the speech samples. The codecs covered in this chapter process a frame at a time. This traffic is placed in voice packets and sent to the receiver.
Processing delay: This factor represents the delay incurred at the codec to run the voice and coding algorithm on one frame. It is often simply factored into the frame delay. Processing delay is also called algorithmic delay.
Lookahead delay: Lookahead delay occurs when the ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.