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The DXR.1 is a digital audio compression device designed for broadcasters. It employs the ITU G.722 international standard to send and receive 7.5 kHz audio at transmission rates of 56/64 kb/s. It is also capable of providing a full 15 kHz bidirectional feed on 112/128 kb/s circuits, such as BRI ISDN, fractional T1 or satellite links.
The DXR.1 is rack mountable, with balanced, line level input and output. Additionally, proper input levels and sync status are indicated on the front panel. A service unit or terminal adapter is needed to interface this codec to your data circuit.
DB25 (25 pin) connectors using the EIA530 protocol are included as a standard data port. An optional cable converting EIA530 to X.21 or V.35 is available.
NOTE: The DXR.1 requires a Terminal Adapter with an Inverse Multiplexer (IMUX) to send 15 kHz on a BRI ISDN line. In the United States, there is an IMUX standard called BONDING, which is featured in reasonably priced TAs made by Adtran, UDS Motorola, and others.
The DXR.1 works on any synchronous 56, 64, 112 or 128 kb/s digital transmission system, including ISDN, Switched 56, Dedicated Digital Service (DDS), Fractional T1, digital satellite links, and wireless modems.
For part-time audio feeds, dial-up BRI ISDN or Switched 56 digital lines are ideal since they are billed at a low monthly cost, plus per minute usage which is not much more than standard analog lines. Basic Rate Installation (BRI) ISDN is available throughout the world. SW56 is a North American "precursor" to ISDN and both services work with one another.
The DXR.1 provides a cost saving alternative to satellite feeds or dedicated circuits. It is ideal for applications requiring high quality (7.5 or 15 kHz) mono audio. Since they have very little processing delay, the DXR.1 is the best choice for live programming such as talk, news, and sports, where real-time cueback is essential. Other applications include network distribution, studio-to-studio links, and STLs.
Also, since G.722 is an international telephony standard, these Comrex codecs provide compatibility with a large established base of users worldwide.
Pulse code modulation, used by most digital audio devices, requires large amounts of bandwidth (or high data rates) for transmission. Techniques have been developed to eliminate redundant information carried within the digitized bit stream. Among the most popular of these is Adaptive Differential Pulse Code Modulation (ADPCM).
The G.722 algorithm employed in the DXR.1 is an international ITU standard which uses ADPCM to achieve a 4:1 data reduction, allowing more audio information (or wider bandwidth) to be sent along a DS0 digital channel.
The DXR.1 incorporates 64X oversampled Sigma Delta Analog to Digital and Digital to Analog converters. The G.722 Algorithm is run on two ADSP-2101 Digital Signal Processors. They use a statistical synchronization technique which is continually updated by the decoder. Audio is sampled and reconstructed at 16 kHz (7.5 kHz mode) or 32 kHz (15 kHz mode) with 16 bit quantization. These codecs automatically adapt to 56, 64, 112, or 128 kb/s transmission channels.
For more information on this product, please visit the Comrex website.
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