Digital Alert Systems DASDEC II, Руководство пользователя

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Digital Alert Systems: DASDEC User Manual
After tuning and verifying reception, check the input levels on the Setup Audio > Decoder Audio page and
make sure they are rated as OK (or occasionally Elevated).
4.6.2 Decoder Audio: Alert Decoding Audio Configuration
The Decoder Audio page has three areas to configure: Alert Decoding Audio, Decoder Audio Monitoring, and
Alert Forwarding Audio Configuration. For Administrative users, a fourth configuration option, Sound System
status and configuration, appears at the bottom of this web page.
Each EAS decoder channel can be independently tuned for input sensitivity and can be enabled and disabled.
Decoder input can also be heard using the audio monitoring controls on this page. The audio output devices
used during alert forwarding are also configured from this screen.
To make changes effective on Setup Audio web pages, see NOTE under the Chapter 5.6 Setup > Audio.
1. Main and Auxiliary Audio Decoder Configuration
Each analog soundcard (Main, Auxiliary) has its own decoder status and configuration display table.
Soundcard name and associated Linux mixer device
The name of the soundcard and its associated Linux mixer device name are shown above the display table.
Audio Input Source: Internal/Radio or Line-In Jack
To the right of the soundcard name is a radio button control that indicates the analog audio input source for
the soundcard. This can be Internal Radio or Line-In Jack. The input source selection switch is VERY
important since it controls the origin of the audio input stream used as the EAS audio source. Typically this
will be set to the Internal/Radio setting for the Main Audio device. To connect external radio receivers, use
the Line-In Jack setting on the appropriate sound card device.
If Radio is selected, a link to the
Setup > Audio > Radio Tuners page is provided in the first column on the
display table as a convenience.
The standard DASDEC has three built-in radio receivers. Two are connected to the main audio device. The
third is connected through the Audio Input Source "Internal A" connection. A fourth audio source, from the
back panel screw connector terminal, is also routed through this input channel.
NOTE: the AES digital audio card does NOT support EAS decoding
. Each table
has a radio button selector for the Audio Input Source. Each soundcard supports two (2)
decoder channels. Decoders can be selectively enabled and disabled and the input
levels can be set. The interface is described below.
NOTE: It is VERY IMPORTANT to verify radio reception and decoder input levels
after tuning. Radio reception can be monitored using the provided Listen on:
buttons for each radio. When you select one of the speakers listed, audio from the
associated decoder for the radio will play-out of the chosen output. To stop the audio
play-out, click on the Turn Radio Monitoring Off button that will be displayed above the
radio tuning sections. Radio frequencies can be tuned while listening.
NOTE: DO NOT LEAVE THE MONITOR ON DURING NORMAL OPERATION
NOTE: The Decoder Audio Monitoring interface provided on the Setup Audio > Decoder
Audio page can also be used to listen to radios. It is less convenient than using the
buttons provided on the Radio Tuners page. It is necessary to use the Decoder Audio
Monitoring interface to listen to the fourth decoder input or to listen to decoders five and