Overview
Acoustic echo (as shown below) is a common phenomenon that is encountered in many types of phone calls. It occurs when speaker output is
fed back to the microphone input. This will disturb the far end speaker as they hear their own voice but delayed. Acoustic echo cancellers (AEC) are
used in phones or in the network to minimize this distortion. Acoustic echo, unlike line echo, is dynamic during a call as people and speakers move about.
In the past, modeling and replicating acoustic echo has been quite complicated often requiring a sound chamber, head and torso, etc. GL has
simplified the process considerably by modeling the acoustic echo path and dynamically changing its characteristics. In effect, the echo path can be
made to vary in a manner similar to the real world. Also, the echo path can be specified to mimic a "small room", a "car", a "medium size conference room", etc.
Dynamism is introduced by slowly morphing the impulse response coefficients in a predetermined manner.
The above features have been incorporated into DSP operators within our DSP Operators in Windows Client Server (WCS) software. This software is
available with our T1 E1 product platforms, including USB T1 E1 Analyzer and
Universal T1 E1 Cards.
GL's new USB based T1 E1 Analyzer is the world's most powerful, full featured, and complete BERT, voiceband, data, signaling, and protocol analyzer on
the market. The Windows Client/Server DSP Operation module allows real-time as well as offline testing using DSP commands to perform functions such as
Amplification/Attenuation, Delay, Filter, File Tx/Rx, Logical operations, Echo Cancel, and so on.
Our DSP Operators in Windows Client Server (WCS) software offers following capabilities:
- Simulate acoustic echo into a mobile phone
- Generate dynamic (changing) acoustic echo
- Test acoustic echo cancellers in mobile phones and other signal processing devices
For comprehensive information, please visit Dynamic DSP Operation web page.
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