Matrix - 15kHz ISDN, PSTN and GSM Digital Audio Codec
The Comrex Matrix provides both ISDN and PSTN full duplex links of 15kHz, and interfaces to the cellular network to provide enhanced audio quality via a mobile phone connection. Fully compatible with all modes of the Vector and HotLine PSTN codecs, the Matrix provides a two-channel audio input mixer with additional tape input, comprehensive call handling and automatic interfacing to Matrix, Vector and HotLine codecs.
The Matrix accepts a plug-in ISDN module that provides three options for getting audio to and from a remote location via ISDN: Industry-standard G.722 on a single bearer; ISO/MPEG Layer III 15kHz bandwidth audio (also on a single bearer); and Comrex Turbo G.722 on two bearers, giving 15kHz full duplex audio with just a 6ms delay.
The Matrix can either connect directly to a suitable cellular telephone but also accepts a plug-in interface for a PCMCIA modem for a GSM mobile phone, over which it can send and receive surprisingly good audio quality via the cellular phone network. Being a plug-in module, the Matrix will be able to take advantage of new developments in cellular services as and when they become available, preserving the value of your investment.
With ultra low bit-rate algorithm broadcast at 15KHz over GSM - With the new GSM plug in module you can enjoy 10KHz on 9.6kbps or 15KHz on 14.4kbps. The module is the same size as the ISDN module, so all you you need to do is just pop the SIM into the slot of the module.
If you’ve got a Matrix, you’ve got options!
The Matrix is designed to accept optional modules which turn the powerful coding engine of the unit into a "future proof" investment. In the portable Matrix, the sturdy module is easily inserted into a channel in the base of the unit. The rackmount Matrix provides room within its 1U housing to accommodate an optional board which connects to the main board with a simple jumper cable. The Matrix’s fluid design, along with flash upgrade capability, allows virtually infinite potential as new circuits become available.
The ISDN Module
The ISDN module transforms the Matrix into a lightweight yet powerful ISDN codec with integrated terminal adapter. The codec engine includes 3 different algorithms. ISO/MPEG Layer III and G.722 are implemented for maximum industry compatibility, and Turbo G.722 yields 15 kHz, very low delay audio transmission. The terminal adapter is designed to work with virtually all international ISDN switch protocols and is available with either an "S/T" or a "U" interface.
GSM Operation
The Matrix provides an interface to GSM wireless phones and improves the quality of these feeds. The unit has a data port into which a GSM phone with an integrated modem may be connected.
TelCell Module
The TelCell module connects to the Matrix Portable Codec adding the ability to send and receive audio through the handsfree port of many mobile phones or standard telephone lines.
Although this module does not add any audio enhancement to the wireless or land line phone call, it makes a useful back-up tool. Adding professional microphones will often improve audio quality. Calls can be placed to regular telephone hybrids with this module (no Matrix is required on the receiving end of the call).
The Battery Kit
The battery kit includes a NiMH (Nickel Metal Hydride) battery, a charger and mounting bracket. The battery may be used as a primary power source to run the unit for up to 7 hours, or it can be used as an optional backup should AC power be interrupted during a broadcast.
The Audio Interface
The Matrix includes two mic inputs (one is mic/line switchable), one headphone output and one line level output on XLR, providing direct connection to mics and headphones or a mixer. An additional -10 dbu tape input allows connection to a minidisc or DAT player.
Phone Line Features
The Matrix adds several utilities which aid in ease of use and reliability on difficult phone lines. The unit automatically detects the optimal data rate and delivers the best audio possible. A MaxRate (Maximum Data Rate) can be set prior to connection, giving further assurance of stability. A quick rate drop feature sets a new MaxRate for reliability with only a 2 second loss of audio. Renegotiation can be disabled, preventing drop outs at inconvenient times. A quick rate drop or a full renegotiation can be performed at any chosen time by pressing a single button at either end of the call. Error correction is available. And even at 14.4 kb/s, the Matrix will deliver 7 kHz audio (see frequency response chart on page 4). Comrex has implemented every tool possible to aid you in delivering a seamless and uninterrupted broadcast.
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