5
I.
IntroductIon
WHat VH2 does
VH2 is a powerful hardware-based telephone system designed for broadcast on-air telephone management. Unlike
legacy systems that interfaced to analog and digital dedicated phone lines, VH2 interfaces only to IP-based (VoIP or
Voice-over-IP) telephone circuits. By this we mean that all phones lines are delivered virtually over a single Ethernet
connection to the VH2.
The voice telephone industry has been moving toward IP voice service for many years already because it
streamlines connections, enhances management, and reduces costs. IP-based voice carries these benefits for the
broadcaster.
The VH2 (and VoIP in general) brings other advantages to broadcasters:
1
VoIP service is generally much less expensive than dedicated legacy phone lines.
2
VH2 implements a codec option (G.722) which delivers better fidelity (7KHz) than ordinary
phone calls. This mode will be automatically selected when possible.
3
VH2 utilizes a VoIP protocol called SIP, which allows integration with existing and future VoIP
gear (e.g. sharing lines and using extensions from PBXs).
4
VH2 can be easily interfaced to legacy PSTN, ISDN, T1 and E1 phone lines through the use of
external gateway devices.
about VH2 audIo ProcessIng
VH2’s main function is to make your on-air phone calls sound great. From an audio perspective, it
does this by:
•
Making sure the caller you select is presented in the best possible audio quality to your con-
sole.
•
Making sure that the caller can hear the studio host(s) clearly.
•
Making sure if multiple callers are on-air, that they can hear each other clearly.
•
Making sure callers with low or high levels are automatically equated (AGC).
A block diagram of VH2 audio connections is shown in the following figure. In this simple configuration, a feed of
the station’s program audio (pre-delay) is fed to the
HOLD AUDIO CH 1
port on the VH2. A studio “mix-minus” feed
is attached to the
INPUT CH 1
port, and the caller(s) audio (for delivery to a single console fader) is available on the
OUTPUT CH 1
port.
Содержание VH2
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