Correcting wrong orientation of H3-VR Ambisonic A recording for 5.1 rendering.

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SmallMountain
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Correcting wrong orientation of H3-VR Ambisonic A recording for 5.1 rendering.

Post by SmallMountain » Fri Jun 28, 2019 8:05 am

Hi.

I have a little problem regarding a recent recording I made. My H3-VR was suspended from 4 fishing lines over the performance space. Trouble is, I hung it facing the 'wrong way'/ It is easy enough to resolve this in the stereo and binaural derivations, but how do I resolve the problem for the 5.1 surround derivation (each derivation performed via the Zoom Ambisonics Player). I use Sound Forge Pro 11 for further editing. My guess would be that I should use SFP11 to swap channel 1 with channel 2 and channel 3 with channel 4 but what about channels 5 and 6. I suppose I could try a spectral analysis of those channels to determine which is the sub-bass and which the centre channel. What I would prefer, however, is to know how to save a 180-degree horizontal reorientation of the Ambisonic A format I recorded in.

Can anyone here offer a solution? What am I missing in the manual?

[I should, perhaps, have pursued my own route to a solution by carrying out a spectrum analysis before posting. It looks like its channels 3 that holds the centre channel, and channel 4 that holds the sub-bass when the 6 channels of a 5.1 resolution are opened in Sound Forge 11. However, I will leave the post here in the hope that others might benefit from it, or offer alternative solutions.]
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allebaug
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Re: Correcting wrong orientation of H3-VR Ambisonic A recording for 5.1 rendering.

Post by allebaug » Tue Jul 30, 2019 9:41 am

Thank you. Good info and diagnostic observation. Not a H3-VR owner, yet, and maybe, but 5.1 would be my objective format.
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SmallMountain
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Re: Correcting wrong orientation of H3-VR Ambisonic A recording for 5.1 rendering.

Post by SmallMountain » Tue Jul 30, 2019 1:30 pm

allebaug wrote:
Tue Jul 30, 2019 9:41 am
Thank you. Good info and diagnostic observation. Not a H3-VR owner, yet, and maybe, but 5.1 would be my objective format.
I should add that I am, in general, very pleased with the performance of the H3-VR. When conditions permit, I used a RØDE NT-SF1 with a Zoom F4 for ambisonic recording but on this occasion, the only practical possibility was to hang the H3-VR as indicated. I was put off buying the H3-VR at first, responding to a negative review which drew attention to the flexible mounting of the microphone insert cluster. However, on second thoughts I rejected the criticism since I could always mount the device via a shock-mount cage if vibration might be problematic. Of course, the H3-VR does not offer the degree of resolution found in the set-up costing more than four times the price, but for its price-point, it performs rather better than I had expected.

What I had to do to correct my 180-degree positioning error was to copy tracks 1, 2, 5 and 6 as separate mono files and then paste them back in the correct orientation.
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allebaug
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Re: Correcting wrong orientation of H3-VR Ambisonic A recording for 5.1 rendering.

Post by allebaug » Tue Jul 30, 2019 3:25 pm

We have similar set-ups, me an F4 and an F8, but with the Senn AMBEO mic. I recerd a lot of acoustic guitar and amateur recital recordings with the Fs, including videos, feeding the cameras a stereo output, but have extra tracks from an array of mics as needed. I don't get around to ambisonic often enough, and generation of 5.1 output would be my practical target. I am interested reading your details and problem resolution, and assessment of the recorder. I read that the resolution does not come out well until 2nd order ambisonic, with 8 mics, and better still with a one or more spot or area mics for prominent subjects.

Still, if, IF, I were to pop for an H3-VR, it would be paired with a 360 video camera. IF. Too many projects, ... still..? Thank you, again. Best,
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