Fraunhofer Sonamic®

Through Fraunhofer’s Symphoria, 3D sound in the automobile is a reality. Under the umbrella of Fraunhofer Sonamic, a new set of technologies expand the automotive sound product range to intelligent audio processing. This new set of technologies takes customer experience of in-car entertainment systems to a new level.

To learn more about Fraunhofer Sonamic please contact: amm-info@iis.fraunhofer.de. The audio experts at Fraunhofer are happy to find the best solution for you.

Sonamic Loudness

The number of in-vehicle media sources has significantly increased in recent years. Today, it is easy to play audio data from USB sticks, MP3 players or smartphones in the car. However, each audio source produces different levels of volume, which the driver must adjust. Adjusting the volume is inconvenient and also presents a safety risk by briefly distracting the driver from the road.

Fraunhofer Sonamic Loudness technology increases passenger comfort and safety by ensuring consistency of volume level while switching between radio channels, media sources or audio tracks. Sonamic Loudness technology also safeguards the dynamic range and sound of the music.

Sonamic Enhancement

To deliver very good audio quality, audio codecs should be used at sufficiently high bit rates. If this is the case, reaching the quality level of an audio CD or lossless codec is easily possible. However, to reduce transmission cost when used commercially, low or very low bit rates are applied which can lead to audible artifacts.

Thanks to intelligent and blind detection, Fraunhofer’s Sonamic Enhancement technology can significantly reduce those artefacts. This algorithm does not require any additional information about codecs or bit rates. All relevant audio codecs such as mp3, AAC, AC3 or codecs used within satellite radio can be processed. Therefore, it does not matter which type of content (music, speech or mixed) is played back. It also does not affect the channel (streaming, satellite radio, etc.) in which the audio content is received.

Sonamic TimeScaling

Seamless Switching for Hybrid Radio

 

With hybrid radio, passengers can continuously listen to a radio station during a car ride even when leaving the broadcast area. This works by combining a radio transmission with the accompanying web stream. Compared to a radio signal’s reception, a web stream can have a delay of 20 seconds or more. When switching to the web stream, portions of the delayed feed are either lost or played twice; both of which are irritating to the listener. Fraunhofer Sonamic TimeScaling synchronizes both signals with each other to produce a precise, indistinguishable transition.

This seamless switch works by having the system recognize in advance that the radio signal will soon be interrupted. The radio begins to calculate the existing offset to the web stream. The resulting value is needed to delay the signal in a way that is inaudible to the customer. Compensating this time difference allows seamless switching, which means passengers can continue to listen to the radio station far beyond the transmission area.

The process also works in reverse, when the system recognizes that the radio signal is strong enough again for good reception. This means it can seamlessly switch from the web stream to the radio signal while keeping the amount of mobile data used for Internet access to a minimum.