Inspired by ASR, I've started looking into the performance of various bits of equipment around the house and have come across a bit of a mystery. A certain 'audio recorder' (which shall go nameless for now in case this is all a misunderstanding on my part) is said by the manufacturer to be a 44.1K/16 bit device. As far as I can tell, though, it isn't behaving like one. I've done various recordings and feel the answer is in there if I knew how to interpret the data. If anyone knows how to do that and is up for it, I'd appreciate your take!
What you see in the attached images is a sine sweep captured by the mystery device as well as recordings of a high-pitched sine tone around 12 kHz using the same box and an RME ADI-2 FS interface. I haven't included a sine sweep recorded by the RME interface as it does exactly what you'd expect it to: continue up to Nyquist without drama or aliasing and dropping off once it hits the lowpass filter.
Oh, and I've also been in touch with the manufacturer who swears the sample rate is 44.1K and that there is an anti-aliasing filter in place around 20 kHz.
The attached images show:
1. A sine sweep recorded by the Mystery Device
2. A 12K sine tone recorded through an RME ADI-2 FS set to 44.1K (Interface A)
3. A 12K sine tone recorded by the Mystery Device, supposedly also at 44.1K (Interface B)
What you see in the attached images is a sine sweep captured by the mystery device as well as recordings of a high-pitched sine tone around 12 kHz using the same box and an RME ADI-2 FS interface. I haven't included a sine sweep recorded by the RME interface as it does exactly what you'd expect it to: continue up to Nyquist without drama or aliasing and dropping off once it hits the lowpass filter.
Oh, and I've also been in touch with the manufacturer who swears the sample rate is 44.1K and that there is an anti-aliasing filter in place around 20 kHz.
The attached images show:
1. A sine sweep recorded by the Mystery Device
2. A 12K sine tone recorded through an RME ADI-2 FS set to 44.1K (Interface A)
3. A 12K sine tone recorded by the Mystery Device, supposedly also at 44.1K (Interface B)