card in PCI bus format offers a comprehensive selection of algorithms
that can run independently on its DSPs as well as the option of adding
a primary rate trunk module (PM). Solution providers can specify a PM
with one, two or four E1/T1 – software selectable – trunks.
Key media processing resources include record and playback with a range
of compressions, DTMF tone detection, matrix conferencing , echo cancellation
, fax, isolated word speech recognition and data transmission protocols.
Each media processing resource function can be used separately or in
combination to develop more sophisticated solutions, making Prosody the
clear choice for advanced speech processing development. In addition,
Aculab’s host based speech technologies ASR, TTS and SVI, using
Aculab’s generic API, are also available under a cost free licence
from software downloads for use with Prosody cards.
Specialist speech partner software is supported and Aculab's offering
includes an Audio Provider for Nuance core speech engine and the Nuance
Voice Platform. Prosody is also integrated with the VBVoice Rapid Application
Development environment from Pronexus and the Envox 6 Communications
Development Platform. In addition, Prosody PCI has been tested for use
with the Asterisk PBX software – for the channel drivers click
through to software downloads.
Using the ECTF H.100 CT card interconnection specification the Prosody
PCI card presents integrators with the highest density and widest range
of speech processing functions available. A single Prosody card occupying
a single slot can deliver up to 256 channels of media processing resources
and up to 124 E1/T1 bearer channels. The optional digital network access
support enjoys the full benefit of Aculab’s protocols and approvals
making solutions easy to work into international markets.
With Aculab’s generic, cross platform API, the learning curve
for developers looking to integrate Prosody PCI technology is greatly
reduced. Rather than dealing with new APIs, attention can be directed
on how to best use the widest range of speech processing functions
currently available (see table for details). Because Prosody can
perform all of these functions on a single card, stock holding
is greatly reduced.
Continuing to set industry firsts in speech processing, Aculab
offers a highly flexible DSP architecture, TiNG to provide developers
with the ability to select the functions they require for an
application. The principle of one DSP (or even one card) performing
only a single function is removed, allowing feature mixes to
be controlled by the developer.
Recognising that a diverse number of applications can be created
using Prosody, a utility tool is available that allows developers
to profile the features required in their total application. Selection
of the resource combination is under the developer’s control,
providing an optimised, concentrated and ‘fine tuned’ solution.
Such a flexible approach minimises costs and maximises competitive
When features are mixed in the same DSP, there is an overhead
for each algorithm to run, so the relationships between features
and channel counts are not linear, and some combinations will produce
better channel counts than others. The utility tool is used to
calculate optimum feature mix combinations.