In this post, I will try to come up with and test a simple microphone design which can produce certain directional cues to enhance the spatial feel of stereo audio recordings, particularly the forward up and down sensation.
Stereo recordings are normally based on volume level difference and time difference between the microphones. Typical used techniques include ORTF, M/S setup eventual combined with a baffle between the microphones (such as a Jecklin disk).
Information about elevation is however largely missing with these stereo methods. In principle, it is not directly possible to tell if a sound comes from above, down, front or back. Binaural microphone techniques (using anatomical ears and dummy head etc.) are able to provide full directional sensation by reproducing the delicate spectral coloring (HRTF) from the human ear and head/body, which tells the brain about the direction of the sound. But this method has a few drawbacks in terms of personal differences and dominating resonances which need post equalization.
So, here I will try to develop a simpler microphone shape which can mimic the up/down directional sensation of the binaural method to improve the forward up and down sensation of my nature recordings.