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Newsletter: GL Releases Real-Time Multi-Channel Audio Driver Software

Welcome to the 2nd March Issue of GL Communication's Newsletter providing information and insight into the latest product introductions and reviews.

The GL Real-Time Multi-Channel Audio Driver option allows almost any software, which normally sends/receives sound to a sound card, to redirect the audio streams to/from timeslots on a T1 or E1 line. This Real-Time Multi-Channel Audio Driver is an optional piece of software for GL's T1 and E1 Analysis cards, and works with almost any sound software such as Cool Edit 2000, Cool Edit Pro, Windows Media Player, etc. This Audio Driver may be installed on Windows 2000 and Windows XP systems.

Some of the advantages of using commercially available sound card software directly with GL's T1/E1 cards are:

  • Real-time views of multiple channels/timeslots simultaneously
  • Full featured audio editing features with DSP effects
  • Play, edit, mix audio streams
  • Apply special effects, e.g. noise reduction, fade, equalization, delay, echo, etc.
  • Convert to/from different file formats
  • Multi-channel record and playback
  • Real-time data analysis, spectral views, frequency and phase analysis, and statistics

The Audio Driver can work in a multi-channel mode with multi-channel sound software such as Cool Edit Pro. When used with Win 2000 OS, the GL Audio Driver allows Cool Edit Pro 2.0 to record up to 10 audio streams directly from 10 different timeslots from one or more T1 or E1 trunks. Likewise, up to 10 separate files loaded in Cool Edit Pro 2.0 can be played out, on up to 10 different timeslots among one or more T1 or E1 trunks. The number of different T1 or E1 trunks depends on the number GL Analysis cards installed in the PC. With sufficient CPU speed (~1 GHz or higher), and a good performance hard drive, you can even record 10 streams while playing 10 streams, using 2 instances of Cool Edit Pro 2.0. On Windows XP systems, up to 14 audio streams can be recorded or played. Cool Edit 2000 can access the Audio Driver to play or record only one stream from any one selected timeslot from any T1 or E1 trunk.

Once installed and enabled, the GL Real-Time Multi-Channel Audio Driver presents (exposes) to the Windows OS up to 14 virtual bi-directional (full-duplex) virtual Audio 'Devices', named GL Audio PCM Channels 01 to 14 (01 to 10 on Windows 2000 systems). Each GL Audio PCM Channel is associated with, or mapped to one of the timeslots (receive AND transmit) available from among the T1 or E1 trunks that are connected to the GL Analysis card(s) installed in the PC. Each full-duplex GL Audio PCM Channel is mapped to a desired T1 or E1 trunk\timeslot by a separate GL Audio Configuration "Patch Panel" application.

An application note has been provided describing the GL's Real-Time Multi-Channel Audio Driver in detail. Please review this application note and give us a call if you are interested in GL's products/software for this or other applications. We would be happy to consult with you on solutions to your testing needs and we look forward to hearing from you.

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