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Difference between revisions of "HD audio for background music distribution"

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(→‎ENA Amplifier as Audio Source)
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* In '''Station Main > Main Settings''' enter a directory number to use for the Line Input:
 
* In '''Station Main > Main Settings''' enter a directory number to use for the Line Input:
  
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* '''Enable the Line Input''': In [[ENA_Configuration_-_AlphaCom_mode#Line_Control|Amplifier Settings > Line Control > Line In]] section, set '''Line In Type''' = "Line Input", and set Impedance to High or 600 ohms (most common).
 
* '''Enable the Line Input''': In [[ENA_Configuration_-_AlphaCom_mode#Line_Control|Amplifier Settings > Line Control > Line In]] section, set '''Line In Type''' = "Line Input", and set Impedance to High or 600 ohms (most common).
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=== Configuration of ICX-AlphaCom server ===
 
=== Configuration of ICX-AlphaCom server ===

Revision as of 10:22, 13 September 2023

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Distribution of HD Audio to ENA Amplifiers

Background music is distributed by using the Audio Program feature of the ICX-AlphaCom. By default this feature is using the HD Voice codec G.722.

In installations where an even better audio quality for background music distribution over the PA system is required, it is possible to use the HD Audio codec PCM L16/48kHz.

The following devices support audio input feed using the PCM L16/48kHz codec:

The following devices can play (listen to) audio in PCM L16/48kHz format:



Note icon
  • The HD Audio stream is not going via the ICX-AlphaCom, the ICX-AlphaCom does not support this format. Only the signalling protocol is controlled by the ICX-AlphaCom.
  • Stations that doesn't support HD Audio will not receive any audio.
  • Although the "HD Audio" option is available in all Turbine devices ("Voice Engine Mode"), the echo cancelling is disabled when enabling "HD Audio". Hence the station will not be suitable for two-way communication. The "HD Audio" option is intended for Turbine kits used as PA Interfaces.



Requirements

Software
HD Audio is supported from:

  • ICX 1.0.3.0
  • AMC 12.5.3.1
  • Turbine 4.9.3.0

License:

Configuration

TKIE-2 as Audio Source

Log in to the web interface of the TKIE kit, and enable Advanced Configuration in the top right corner of the web interface.

Enable Line In:
To use the TKIE-kit as Audio Program source, enable Line In. A reboot of the TKIE kit is required for the change to take effect:

Enable Line In on the TKIE kit



Disable AGC (Automatic Gain Control):

Disable AGC



Set Audio Engine Mode = HD-Audio:

Enable HD-Audio



ENA Amplifier as Audio Source

Enter a directory number to use for the Line Input


Configuration of ICX-AlphaCom server

The "HD Audio" is transmitted from the Audio Source as Multicast data in the network. The ICX-AlphaCom must be configured to use Multicast for group audio.

In AlphaPro, Exchange & System > System > VoIP tab, enable Multicast:

Enable Multicast in ICX-AlphaCom


The Line Input channel of the ENA Amplifier (or the TKIE-2 kit) must register to a directory number in the ICX-AlphaCom server.

In AlphaPro, Users & Stations, enter a directory number for the Line Input and set the Noise Reduction to 0:

Create a Directory Number for "Line Input"



Create a feature code to become an Audio Source. From AlphaPro Directory & Features, press Insert and create a new directory number:

  • Feature 118 - Program Source
  • ID (Parameter 1) = Program channel 1-70
  • Parameter 2 = Group index 1- 255. Chooose a group which is not in use. Important: At least one station must be included in this "dummy" group.
  • Parameter 3 = 10 (PCM L16/48kHz codec)

The example below shows how to add directory number 6801 as the code to become the source of Audio Program #1.

A device dialing 6801 will become the source for Audio Program 1 (ID = Program channel). A station must be included in group 100.



Note icon The station added to the group doesn't have to be a real station, simply pick any unused station. Do not add an IP Dummy to the group, as it will prohibit the HD Audio setup.


A station/device dialing feature 118 becomes the program feeder. Add an event that sets the Line Input of the ENA Amplifier (or TKIE-2) as audio program source. Use the event 13 (Faulty Station), When Change To = OFF, and action: $DD L%1.dir L6801.

The ENA Line Input dials 6801 after registration, and becomes the source for program #1


The Audio Program Source must be allowed access to feature 118. To avoid any other station/device dialing the directory number for the feature, it is advisable to define a separate COS for this feature. Add feature 118 to this Class of Service (CoS #2 in the example below).

Make feature 118 "valid" in Class of Service 2


Assign the Audio Program Source to the Class of Service:

Setting Class of Service 2 for the audio source station/device


Note icon
  • The Directory numbers used to listen to program are the default numbers 801 - 806. The directory number for feature 118 (e.g. 6801) is NOT for listening, but used to set the source for the program channel.
  • In AlphaCom XE20/26, do not use feature 118 for Audio Program channel 1-6, as these channels are reserved.
  • In AlphaCom XE7, do not use feature 118 for Audio Program channel 5 and 6, as these channels are reserved.



Using Audio Programs

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