Hyperdeck's Mysterious Audio Recording Ability.

Hi all,

This phenomenon has gotten my scratching my head in disbelief. I thought that 32-bit audio recording was introduced by Sound Devices and Zoom. But my Hyperdeck exhibited this behaviour in its audio recording which I'm hoping to get an explanation.

We record our live video feeds from an ATEM 4K 1 M/E. Audio from our sound desk is send into the ATEM. Recording format is PRORES LT.

I took back the recordings in FCPX and when I looked at the waveforms, it was extremely low for spoken word. It was virtually flat!

However, when I increased the gain by another 20dB, I managed to recover the audio with no added noise at all!
It was absolutely clean and usable. I was hoping some one could explain to me how audio is recorded in the hyper deck that would allow such behaviour.

Thanks in advance!

Hey all,

Does anyone have any input on this? I’m curious as to know how this works.
Thanks!

If you are taking the SDI or HDMI video output from the ATEM into the HyperDeck, then any analog to digital conversion of the audio has already happened by the time the audio gets to the HyperDeck. I believe the ATEM outputs 24-bit / 48 kHz audio embedded with the video output, so the HyperDeck is simply recording the digital audio it is receiving.

So there's not any magic happening within the HyperDeck here. 24-bit audio does provide a decent amount of dynamic range though, which may be sufficient for boosting the audio in post.

If you are taking the SDI or HDMI video output from the ATEM into the HyperDeck, then any analog to digital conversion of the audio has already happened by the time the audio gets to the HyperDeck. I believe the ATEM outputs 24-bit / 48 kHz audio embedded with the video output, so the HyperDeck is simply recording the digital audio it is receiving.

So there's not any magic happening within the HyperDeck here. 24-bit audio does provide a decent amount of dynamic range though, which may be sufficient for boosting the audio in post.

Thanks Dave for your response. Appreciate the insight!