Tài liệu Thực hiện tiếng nói qua IP (P1) doc
Tài liệu Thực hiện tiếng nói qua IP (P1) doc
... o¤ered over an IP network. The resulting architecture demands
VoIP GWs to convert the TDM-formatted voice signal into IP packets at
the ingress and vice versa at the egress. The VoIP GK controls ... international o‰ces, VoIP implementation may be
preferable because such corporations may already have a large operational IP
or overlay -IP network in place. The addition of VoIP service in...
Tài liệu Thực hiện tiếng nói qua IP (P3) docx
... as well.
The following variants of SIP have emerged during the past few years: SIP-,
SIP best common practice (SIP-BCP), SIPþ/SIP-T, and so on. However,
SIPþ/SIP-T appears to be the most useful ... and hardware-based SIP and IP phones were available.
For call routing over a large IP network, SIP may use the TRIP (telephony
routing over IP, a work-in-progress in IETF’s IPTel WG, RFC 2871)...
Tài liệu Thực hiện tiếng nói qua IP (P8) docx
... NETWORKS
119
the VoIP or IP- telephony service within a corporation are IP- PSTN MGWs or
VoIP GWs, VoIP call servers or call managers, IP phones, an uninterrupted
power supply (UPS), and Ethernet and IP switches ... using IP- based network. The IP- PSTN MGWs of Figure 3-8
are now replaced by the IP- PBXs. The VoIP GW and CC (Fig. 8-2) control the
resources in the VoIP line cards of t...
Tài liệu Thực hiện tiếng nói qua IP (P2) pdf
... congestion in the network.
Even though IPv4 is the most widely used version of IP in the world, the
IETF is already developing the next generation of IP (IPv6, RFC 1883; the
header format is shown ... legacy VoIP protocol. Figure 2-7 shows the protocol layers for real-time
services like VoIP using the H.323 protocol.
Other emerging VoIP protocols are IETF’s session initiation protocol (SI...
Tài liệu Thực hiện tiếng nói qua IP (P4) pptx
... 4
CRITERIA FOR EVALUATING VoIP
SERVICE1
In this chapter, I describe a set of important criteria that can be used to per-
form qualitative and quantitative measurements of IP phone or POTS phone
(black ... voice packets; (c) use multiple moderate-
speed WAN IP links for VoIP applications, and periodically monitor the utili-
zation of these links in order to route the VoIP calls and tra‰c i...
Tài liệu Thực hiện tiếng nói qua IP (P5) pdf
... Without
proper synchronization of the asynchronously operating IP- PSTN GWs and
other IP domain network elements like routers and SIP or IP phones, voice
quality and service reliability cannot be assured.
The ... and IP networks, IP network impairments, and ele-
ments of SS7 networks like SCP and STP. Other network elements include
(a) the network timing server, (b) software- and har...
Tài liệu Thực hiện tiếng nói qua IP (P6) ppt
... IP phones to high-end residential and enterprise markets.
IP- PBX, IP CENTREX, AND IP- BASED PBX TIE LINES
IP- PBXs are PBX devices that support the following:
a. Various IP telephony and/or VoIP ... Expected from
IP- PBX and IP- Centrex
Simultaneous support
of IP and POTS
(analog, digital,
ISDN-BRI) phones
Support of VoIP for both ac-
cess (IP phones) and trans-
port (inter-PBX...
Tài liệu Thực hiện tiếng nói qua IP (P7) ppt
... di¤erent sets of IP
addresses to guarantee the required quality of service; and
d. Deployment of IP version 6 (IPv6, IETF’s RFC 2460/1883) or IP version
4 (IPv4, IETF’s RFC 791) with IPSec infrastructure ... networks.
94
VoIP IN THE PUBLIC NETWORKS
an adjacent IP telephony GW, along with a VoIP call controller, must be
added.
The VoIP GW and the CC are interconnected to the same LAN t...
Tài liệu Thực hiện tiếng nói qua IP (P9) pdf
... on.
GUIDELINES FOR IMPLEMENTING VoIP
129
SIP-based VoIP service can be introduced in any operational IP network of
an enterprise by deploying the SIP server-based VoIP call controller (CC), call
manager, ... of plug-and-talk-based IP phones. These phones can support
VoIP service over IP- based networks equipped with a call controller (CC) and
MGW. As discussed in Chapter 6, IP phones c...
Tài liệu Nhận dạng tiếng nói bằng mạng Nơron docx
... tích tín hiệu tiếng nói
Phân tích tín hiệu tiếng nói bằng phương pháp LPC được thực hiện qua các
bước sau:
- Cải thiện tín hiệu (preemphasis):Tín hiệu tiếng nói s(n) được đưa qua hệ
thống số ... này dữ
liệu tiếng nói được đọc trong buffer dữ liệu của Windows.
- Đầu ra: kết quả cần nhận dạng
- Quá trình nhận dạng tiếng nói được thực hiện qua các bước:
+...