Audio Setup

Most Burli workstations need little setup for local (foreground) audio playback and manual recording. However you may wish to change the audio format and sample rate the workstation uses. And in computers with multiple audio cards or multi-channel audio cards, you may need to specify the audio device(s) Burli should use.

Playing Device

Select a device from the list. If there is only one device, Burli will automatically select it for you. Note that you cannot share background recording and foreground playback functions on one sound card. So, if you have set up background recordingyou must choose a different sound card for foreground playback.

If you have a sound card in the computer that does not appear in this drop down list, check that the latest WDM drivers are properly and that the card appears in Windows’ Device Manager.

Recording Device

Select a device from the list. If there is only one device, Burli will automatically select it for you. Note that you cannot share background and foreground recording on one sound card. So, if you have set up background recording you must choose a separate sound card for foreground functions.

If you have a sound card in the computer but it does not appear in this drop down list, check that the latest WDM drivers are properly installed and that the card appears in Windows’ Device Manager.

In most single-sound card Burli workstations, there is only one device and it is used for both local playing and recording. These settings only need to be adjusted in workstations where there are multiple audio devices or a multi-channel audio card is being used.

If you want to have the ability to record all audio that is “heard” on a workstation (YouTube, Web Streams, Script Audio, etc.) without having to go through a mixer, Windows 7 and 8 provide this functionality but not by default. The sound device is called “Stereo Mix” and can be easily enabled with the following steps:

  • Click on the Start Menu

  • Enter “mmsys.cpl” <enter>. This takes you to the Control Panel of Sound Devices.

  • Click on Recording tab

  • Right-Click in the pane and select “Show Disabled Devices”

  • Find “Stereo Mix” and then Right-Click to select “Enable”

  • Go to the Audio Tab in Burli and choose “Stereo Mix” for the recording device.

Recording Format

Select either Linear (PCM) or MP2 compression as the recording format for this workstation. If you select MP2, also specify a bitrate (between 64 and 384 kbit). Burli defaults to linear (PCM) audio.

Samples

Select a sample rate. The higher the sample rate the better the audio quality but the larger the audio files. If network bandwidth or audio storage is a concern then select a lower sample rate (we do not recommend lower than 22050 for broadcast quality). Most newsrooms use 44100 Hz (same as CDs) and Burli defaults to this setting.

Record in Stereo

Check this box if you wish this workstation to record in stereo. All Burli audio functions work in either mono or stereo. For technical reasons MP2 audio is almost always record in stereo, even if the waveform appears to be mono. If you truly require mono MP2 for some reason, contact Burli Support as there will be other special settings you need to apply. Burli defaults to mono recording. Because of limitations in Windows audio drivers, this mono channel is usually the left channel rather than a mono sum of both left and right channels.

Mute Line-in when not recording

Many computer sound cards pass audio through the sound card from line in to line out, even when the computer is idle. While this is often useful for monitoring audio sources, this can sometimes cause problems with feedback loops and audio bleed in on-air studios and at workstations where reporters also voice their stories.

This function mutes the line-in jack to the foreground sound card, preventing audio from getting into the computer, except when the workstation is actively recording. The mute is automatically re-applied when recording stops.

System Standards

We strongly recommend using the same audio format and sample rate throughout your newsroom on all Burli workstations. While Burli does converts common sample rates and formats when needed, audio quality suffers from the conversion and some editing functions (such as the Wave Wizard) do not accept multiple sample rates in one mix.

If you are part of a broadcast chain or intend to share your audio files with other newsrooms over a WAN using Burli’s Virtual Newsroom, we recommend consulting with other newsrooms and settling on a consistent audio format. This is not absolutely necessary but avoiding constant format conversions will improve audio quality and speed sharing of data.

Global Audio Settings

If the local format settings are not editable (greyed out) it means they have already been set system-wide. A system administrator can force Burli to use the same foreground audio format on all workstations that are pointing to the same root data path. A local over-ride exists for workstations that must use another setting.

The global audio settings are defined in the configuration file main.ini. The syntax is:

[Startup]
GobalAudioSettings=[LINEAR|MP2],[MONO|STEREO],[SAMPLERATE],[MP2KBITRATE]

Here, for example, is the setting for 48 KHz MP2 stereo at 192kbit:

GlobalAudioSettings=MP2,STEREO,48000,192

The MP2KBITRATE parameter is not required if the audio format is linear, for example:

GlobalAudioSettings=LINEAR,MONO,32000

If global audio settings are specified in main.ini, then the Format, Samples, and Record in Stereo controls are disabled at ALL workstations that use the same root data path. Note that the GlobalAudioSettings option never overrides background audio capture settings; these are always configured manually.

A registry override is available if foreground audio settings on a particular workstation should differ from the global settings. On that workstation, go to this key in the registry:

HKEY_LOCAL_MACHINE
Software
Burli
RadioStar
Audio
Device1

In this key, create or edit a DWORD field named:

EnforceLocalSettings

Set the value to 1 to enforce local settings (ignore global settings). The default value for this field is 0.

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