Open Architecture Computer Telephony Servers and Tools  
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Automatic Call Administration Systems Using Aculab’s Prosody Card.
{Aculab's Prosody Card}

Chelston Specialise in implementations using Aculab's Telephony card, 'Prosody'. This Card provides developers with versatile, high density speech processing in an extremely compact and flexible form. A single Prosody card - occupying a single slot - can deliver up to 240 channels of duplex speech processing. Prosody is available in ISA and PCI formats.
Because Prosody uses high performance floating point DSPs (the SHARCTM from Analog Devices), Prosody processing is not restricted to "low-end" algorithms that might usually be expected from a speech processing card (tone detection, call progress, data compression ...). On the same platform, it offers a considerably broader set of "high-end" technologies including Automatic Speech Recognition, Fax processing and Text-To-Speech conversion (TTS). This high performance, together with Aculab's DSP software technology brings an extremely high density, and corresponding value for money to the full range of features. And because Prosody is a generic platform the whole feature set is accessible to applications via a single, generic API, and potentially in a very compact system.
Compared to traditional speech cards (multiple APIs, restricted functionality, high per-channel cost), and coupled with the fact that all of Aculab's DSP algorithms are provided free of charge, Prosody is an excellent investment for application developers and system integrators. From an extremely competitive initial investment, functionality can be added and systems can grow without further financing of hardware and application code. If there is a requirement for a specific algorithm, Prosody is an open platform, and will support third party code instead of - or as well as - Aculab's proprietary algorithms, affording complete flexibility to the developer.
For detailed API information, see the Prosody Documentation page. Below is a list of Prosody's capabilities - follow the links for more detail: BASIC SPEECH FUNCTIONS Record and Playback Tone Generation Tone Detection ADVANCED FUNCTIONS Call Conferencing Speech Recognition Echo Cancellation Aculab Text To Speech Lernout and Hauspie Text-to-Speech Conversion (TTS) Lernout and Hauspie Automatic Speech Recognition Fax Datacomms For information on other topics related to Prosody, have a look at the tabs at the top of this page.
For an interactive demonstration of Prosody's capabilities, telephone +44 1908 273989

Aculab's Prosody Card Features
  • Up to four floating point Digital Signal Processors (DSPs) per card
  • Playback and recording of speech with variable compression and speed
  • Fully programmable tone generation and detection, with support for pulse (10pps) detection
  • Speech recognition of digits and whole words
  • Three speech processing builds shipped as standard to balance advanced features and channel count
  • Matrix conferencing of up to 120 identifiable full duplex channels per card
  • Prosody's compression rates down to 16kbps and 12kbps open the path to very high performance speech processing applications.
  • Fast and slow playback is available at all data rates - 64kbps to12kbps - and is uniquely controllable though the range of half to twice base speed, without affecting pitch.
  • Record and playback at 64kbps, 48kbps, 32kbps and 24kbps using industry standard ADPCM.
  • Record and playback at 16kbps and 12kbps using Aculab's proprietary data compression algorithms.
  • Sampling rates and coding methods configurable on a channel-by-channel basis.
  • Pitch invariant fast/slow replay at between 50 to 200 percent of normal speed over all data rates.
  • Playback volume control and automatic gain control at all data rates.
  • Trimmed recording to eliminate periods of silence at all data rates.
  • Option of combining two playback channels per output.

 
See Also [BASIC Rate v Primary Rate & CARD Configurations] 


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