It has been demonstrated in videos already, Nokia’s next step in Rich Recording: directional stereo recording in the upcoming Lumia 1520. Recently, Nokia published a White Paper from which I will share the following quotes:
“Nokia Rich Recording technology was made possible by developing an entirely new digital microphone technology to handle high sound pressure levels. The new microphone technology was called High Amplitude Audio Capture (HAAC) microphone and it was able to handle more than six times the sound pressure level compared to conventional smartphone microphone technologies.”
“Later, the HAAC microphone technology was made available for selected Lumia devices delivering distortion – free audio recording capability, but it was not until Lumia 1020 when the full featured Nokia Rich Recording was introduced to Lumia smartphones with the Nokia Pro Camera application. In Lumia 1020 , based on the feedback from Nokia 808 PureView, the audio bass management filter setting was exposed to users for controlling the low frequency cut – off in the recording . This setting allowed more advanced users to optimize the audio recording quality for different recording conditions.”
“Both Nokia 808 Pureview and Lumia 1020 capture the sound in omni – directional fashion . While the sound quality does not leave much to complain about, the sound is picked equally from all directions limiting the capabilities to emphasize the preferred subject in presence of distracting ambient sounds. The microphone components used in Nokia Rich Recording devices are inherently omni -directional. That is, each component picks the sound equally from all directions without the ability to focus in the direction of video capture. In Lumia 1520, a different approach was taken. We included four second generation, omni-directional, low-noise HAAC microphones to form two identical microphone pairs, one for each audio channel.”
“The signals from each microphone pair are then processed with Nokia capture processing algorithms in 32-bit arithmetics. The processing, combined with suitable acoustics implementation of the microphone pairs, outputs a directional, cardioid type, stereo recording pattern. With the unique combination of Rich Recording and four microphones, Lumia 1520 is capable of recording sounds in front of the camera, while attenuating the sounds from other directions. The sensitivity difference between the sounds in the front of the camera compared to the sounds in back of the camera can be up to 10dB in free-field conditions. In other words, the sounds in front of the camera can be recorded even twice as loud compared to the sounds in the back.”
So much for the quotes I chose from Nokia’s White Paper, written by Heiki Sassi and Ari Koski, on behalf of Nokia Lumia audio technology experts. Click on the image above to see the complete White Paper!