Atomos Ninja V Problem With Audio Distortion On Its Microphone Input
Chapters for this video:
00:00 Read Me Notice
00:05 Microphone Recorded With The Ninja Via HDMI
02:28 Microphone Recorded With The Camera's Mic Input
03:55 Microphone Recorded With The Ninja's Mic Input
08:15 End Summary & More Information
12:13 End Title
In this video I'm showing a very clear example of audio distortion on the audio mic/line input on my Atomos Ninja V. The distortion would appear to only be an issue when using the Ninja's microphone input, as the embedded audio being sent over the HDMI input doesn't have this issue. Which it shouldn't as long as the source/camera microphone gain and level wasn't being overdriven, clipping or distorting.
It also appears that there's a limiter being applied, whether you want/need it or not, at the preamp stage. In fact, after thinking about it, it may be the case that preamp gain structure in the Ninja V is digital. As in, after the microphone input has been sampled by the mic input's analogue to digital convert, also know as A/D or A to D, then it is that digital signal that is being gained or attenuated in the digital domain.
If this is what is happening then it would mean that the preamp's analogue domain has a fixed gain and any attenuation or gaining is done digitally within the digital domain to the sampled audio signal. This is of course a bad scenario because once the analogue input/signal is overdriven, clipped or distorted. Then nothing you do after that point will have any affect to any distortion in the signal and any distortion in the distorted signal will just get quieter or louder with the gain structure and the distortion will remain and just get quieter and louder.
I don't know this for sure but I'm only suggesting it as there are other audio capable devices that use this method of processing what should be done in the analogue domain but in the digital domain. None the less, this method of gaining and processing audio has many issues.
Another reason why I suggest this type of digital manipulation is because of where the limiting seems to be acting and the fact that attenuating the Ninja's microphone level on the 'so called' preamp, doesn't make any difference to the distortion. This can be clearly seen in the video as I show the actual record level, which is nowhere near clipping as it does not overshoot 0db or exceed the dynamic range of the recording and the input level from the microphone wasn't too hot. As can be proven when using the microphone input on my Sony FDR-AX100 camera's 3.5mm mic input, which does not distort with the same mic.
There's also a chance that this could be an impedance related issue.
It's also worth noting that my Sony camera is about 8 years old and you may reasonably expect its microphone preamp to be inferior to the newer and more modern mic preamp on the Ninja V.
I will be linking this video with a support request to Atomos and ask them to clearly explain how the microphone and line level gain staging and structure work on the Ninja V. My hope is that this issue is just down to a defective single unit and that a replacement will remedy my issue.
Regardless of the response from Atomos and the outcome to my issue, positive or not. I will make a follow up video to this one once I have my answers from Atomos.
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