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,
Start your free trial
ROLE OF DSPS IN PACKET-VOICE OPERATIONS
A DSP is a specialized processor that has been in use for many years in other telephony applications such as mobile/wireless networks. They are attractive for internet telephony because they are small, use relatively little power, and are very fast. Packet voice requires computational-intensive operations and special processing, and a standard microprocessor is not up to the task of performing these operations.
In addition, packetized voice requires considerable multiplication and addition functions in a very short period of time. A DSP is designed to support these types of functions. Multiplication operations to estimate the frequency spectrum of a signal are very computationally intensive, and are often ...