About Alango

Alango is a leading provider of voice processing technologies for mobile and other types of voice communications. Alango technologies are distinguished by high voice quality as well as their robustness to different types of noises and possible non-linear distortions in a voice communication system. Alango technologies are designed to provide maximum ease of integration into baseband software as well as other applications and computational environments. They require little fine-tuning for a specific acoustic environment or product. Besides, developed auxiliary procedures allow automatic estimation of acoustic parameters of a product and technology fine-tuning providing the best possible performance.

Significant Alango advantages are its flexibility in its business model and excellent support provided to technology licensees and equipment manufacturers.

Product Offering

Voice Communication Package (VCP)

The package includes:

• Acoustic Echo Cancellation with residual echo suppressor and comfort noise generator;
• Automatic Gain Control with fast release time and high robustness to noise;
• Noise Suppression; - Multipband Dynamic Range Compression for speech ineligibility enhancement;

There are Full, Lite and Compact versions of the package implementing different tradeoffs between MIPS, Memory and processing delay parameters. These versions cover all possible types of applications providing the best possible performance for available resources.

Technologies from the Voice Communication Package are very well integrated with each other sharing the same subband decomposition schemes and some computational blocks. However, if necessary, each of them can be used as a standalone technology.

Adaptive Directivity Microphone (ADM) technologies

These microphone array technologies allow building adaptive directional microphones of different directivity order utilizing 2 or more omnidirectional microphones. Applications include advanced mobile phones as well as more traditional applications for directional microphones., ADM provides the following advantages over conventional, acoustic directional microphones:

• Better SNR improvements;
• Much easier to build into a mobile device;
• Very low sensitivity to wind;
• No proximity effect;

There are two version of ADM technology:

• Low delay version for real life sound reinforcement systems with overall delay less than 4ms;
• Low MIPS version for mobile communications sharing the subband decomposition scheme with Voice Communication Package;

Noise Dependent Equalization (NDE)

Noise Dependent Equalization dynamically changes/equalizes the sound produced by a mobile communication device speaker according to user's environment. The objective of the technology is to modify the reproduced sound in way so that it is always intelligible but not annoyingly loud in changing noisy conditions. This is achieved by monitoring the intensity and spectral properties of the environmental noise and modifying the reproduced sound accordingly. This technology virtually eliminates the need for volume control on mobile communication devices such as mobile phones and hands-free car kit.

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