Skip to Main Content
IP Communications and Services for NGN
book

IP Communications and Services for NGN

by Johnson I Agbinya
December 2009
Intermediate to advanced content levelIntermediate to advanced
411 pages
12h 24m
English
Auerbach Publications
Content preview from IP Communications and Services for NGN
VoIP: Voice over Internet Protocol 303
Coding Delay
e first requirement for transmitting voice as packets is coding. e function is to
convert analog voice to digital data (coding), and the device or software used to do
this is called the coder. e coder also performs voice compression. Traditionally, if
voice is sampled at 8 kHz, and each bit is represented by 8 bits, then the bandwidth
of the channel to carry the sampled speech without compression must be 64 kilo-
bits per second. Hence, one voice channel has capacity:
CfQ
s
=∗
where f
s
is the sampling frequency and must be at least twice the highest frequency
content of voice (taken to be about 3.4 kHz), and Q is the quantization bits (num-
ber of bits per sample). Transmitting voice at
Become 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,
and much more.
Start your free trial

You might also like

Multimedia over IP and Wireless Networks

Multimedia over IP and Wireless Networks

Mihaela van der Schaar, Philip A Chou
Authorized Self-Study Guide Building Cisco Multilayer Switched Networks (BCMSN)

Authorized Self-Study Guide Building Cisco Multilayer Switched Networks (BCMSN)

Richard Froom - CCIE No. 5102, Balaji Sivasubramanian, Erum Frahim - CCIE No. 7549
Deploying IP and MPLS QoS for Multiservice Networks

Deploying IP and MPLS QoS for Multiservice Networks

John William Evans, Clarence Filsfils

Publisher Resources

ISBN: 9781420070910