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VQA™
Voice Quality Assurance (VQA™) technology blends Ditech Networks’ core
competency of hybrid and acoustic echo cancellation with an advanced set of
voice quality improvement features to create a clear calling experience for users
of any phone or handset in any ambient environment. Integrated into Ditech’s voice
processor platforms, VQA technology enables service providers to select the right
mix of features to improve, measure, and manage the user’s experience
of voice quality in their networks.
Ditech’s VQA technology delivers the most advanced voice enhancement features on the market:
| Bidirectional Noise Cancellation |
Eliminates background noise from a caller’s environment by up to an industry-leading
21 dB while maintaining voice quality. Maintains a provisionable comfort noise floor for an excellent conversational quality. |
| Bidirectional Acoustic Echo Control |
Adaptively converges on nonlinear echoes from handsets and handsfree units arriving with network delays
of up to 400 ms, canceling echoes with path losses as strong as an industry-leading 15 dB, without double-talk clipping. |
| Bidirectional Level Control |
Automatically adjusts voice volume to a comfortable listening level as determined by the network operator
and the listener’s environment, with the ability to amplify only speech, not the background noise, for improved
signal-to-noise ratio. |
| Enhanced Voice Intelligibility |
Dynamically tunes incoming speech’s spectral characteristics in response to the noise
characteristics of the listening environment, allowing the listener to more easily distinguish and understand
the human voice in loud environments. |
| Hybrid Echo Cancellation |
Completely eliminates wireline-network-induced hybrid echo with tail delays of up to an
industry-leading 192 ms, guaranteeing echo coverage for converged networks. |
| Voice Quality Monitoring |
Provides continuous, non-intrusive measurement and reporting of a full range of voice quality metrics on every call. |
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Speech Before and After Processing with Ditech’s VQA™ Technology
» VQA™ – Technical Specifications
