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is a software only product providing core speech
processing resources that run on a host PC’s CPU – eliminating
the need for a dedicated digital signal processing (DSP) resource card.
Prosody S operates in a voice over IP environment and is accessed via
Aculab’s generic API.
Traditionally, media processing functions have been accomplished using
dedicated DSP resources on a card located in a PC expansion slot. This
approach benefits from having a well defined set of performance characteristics.
It has the advantage of being highly scalable if the cards are well
designed and minimise the interactions with the host processor and the
host is left alone to execute the application program. The only drawback
of this approach has been a high entry cost for small-scale solutions.
For up to 120 channels of IP telephony, the power of today’s host
processors makes it feasible to run all the necessary speech processing
functions on the same server as the host application. Prosody S has been
specifically engineered such that the traditional problems sometimes
associated with IP telephony – such as drop-outs and delays – are
minimised when used in IVR-type applications.
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Prosody S is also available as a media processing resource for use
with the Envox 6.1 Communications Development Platform and VBVoice,
the Rapid Application Development environment product from Pronexus.
Prototyping of your product can be very fast indeed using these
application generation platforms, rather than the lower level
coding that would otherwise be employed.
Prosody S supports a number of speech processing features in common
with the Prosody DSP resource card, including:
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G.711 playback and record in either A-law or µ-law
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Silence detection and elimination for recording
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DTMF generation and detection
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Simple tone handling with user defined tones
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Automatic gain control (playback and record)
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Volume control (playback and record)
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Support for Aculab ASR and TTS
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Optimised two-party conferencing, which can
be used to mix the inputs from two separate parties and record
them to a single file
IP media session software is proven technology with our IP telephony
hardware and is included with Prosody S. Features include:
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SIP and H.323 protocol support
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Adaptive jitter buffer
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RTP
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DTMF over IP packets – RFC 2833 for SIP
and via User Indication for H.323
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Voice activity detection and discontinuous transmission
(DTX)
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Record termination on silence
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Two IP calls may be switched together (‘tromboned’)
using the Media Point API, while A-law and µ-law coding
conversions are performed if necessary between the two calls
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On a typical current specification machine 120
IP channels are supported with the following speech processing:
- 60 conference and 60 record channels
- 120 half-duplex play and record channels
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Aculab installation and configuration utilities
(AIT/ACT) available when using Version 6 telephony software or
later
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Support for Windows XP/2000/Server 2003 operating
systems
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Prosody S can co-exist with Prosody cards in
the same server, allowing an application to separately handle
calls in both IP and TDM environments.
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Prosody S is not dependent upon proprietary
processor features and is suitable for use with AMD and Intel
devices
New features will be added on a regular basis to address
opportunities identified with our customers. For your additional
requirements please contact your Account Manager.
Prosody S is available to purchase under a software licence agreement
via your Account Manager - when purchasing licences you have
the option of ordering Prosody S software on a CD or downloading
it via the Aculab installation tool (AIT).
Aculab consider support a key part of the product and as such
our technical support services are included in the price – unlike
most competitive offerings.
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