Fraunhofer Cingo^®

With Fraunhofer Cingo®, your mobile devices become true multidimensional sound theaters. Plug in your earphones or use the built-in stereo speakers for enveloping surround sound and 3D audio when enjoying your movies or music library.

But Cingo does more than enable an excellent surround sound listening experience over stereo speakers or headphones; it also provides existing stereo content with a more natural, clearer sound, and includes loudness optimization for listening in noisy environments. In addition to the existing stereo or surround content, Fraunhofer Cingo supports rendering of 3D audio content with formats that add a height dimension to the sound image.

Due to this unique combination of latest developments in audio technology, Fraunhofer Cingo delivers an exceptional level of audio quality, unmatched on mobile devices.

The powerful and innovative underlying signal processing was developed by the audio experts at Fraunhofer IIS, the home of mp3 and AAC.

On its way from the loudspeakers to our ears, sound is altered in several important ways. By the time it reaches us, it contains information about the listening environment as well as the actual musical or speech content. In addition, sound waves that arrive from different directions are shaped by our head and outer ear. Collectively, this information helps us to identify the distance and direction of a sound source.

When using headphones, this information is absent because the audio content is played back almost directly at our eardrums and therefore appears as if the sound is 'in' our head. This can lead to considerable discomfort during extended periods of listening.

But researchers have discovered that these changes in sound waves can be measured and modelled by digital filters. By applying those filters to audio signals when listening on small devices or headphones, we can achieve a spatial sound impression close to the one achieved with 'real' loudspeaker playback. This technology is called binaural audio processing and is just one feature of Fraunhofer Cingo.

Fraunhofer Cingo creates an immersive surround sound experience reminiscent of the one we all know and love from the cinema. Flexible and convenient, the technology works with any pair of regular headphones or built-in stereo speakers.

Virtual surround sound for headphones

With Cingo, each audio channel can be presented as a virtual sound source, for instance as a loudspeaker in a listening room, in such a way that it is heard from a specific location and distance. The sound appears to come from “outside the head” and from outside the headphones. As a result, when using Cingo, the listener is always sitting in the sweet spot.

Virtual surround sound for stereo loudspeakers

Dedicated speaker processing enables the virtual surround feature even when sound is played back over stereo loudspeakers, such as from a laptop, tablet or larger smartphone. In these instances, the sound appears to come from outside the device and feels bigger and more spatial. The result is an engaging and compelling immersive experience that brings the listener completely into the acoustic environment.

Loudness optimization

Within a noisy environment, such as the subway or a bus, or with devices where the loudspeakers or headphones simply cannot output sufficient volume, loudness processing can be tremendously beneficial. The loudness optimization feature of Cingo delivers a natural and clear sound even in the most challenging situations while preventing unpleasant distortion or any clipping which would lead to reduced audio quality. It is particularly useful for content that is very soft or of high dynamic range.

Device-specific equalization

The quality of headphones and loudspeakers can significantly limit the user’s audio experience.The equalization feature of Cingo, compensates for the lack of bass usually encountered with smartphones and tablets, and corrects any unpleasant resonance frequencies by optimizing your audio on-the-move. The innovative techniques involved were developed by studying and measuring the performance of a variety of different headphone models and loudspeakers on mobile devices.