Digital Signal Processing
What is this video supposed to prove Nick?
ft/2 = 48kHz does not mean that on the disk with an inherent signal-to-noise ratio of less than 70dB and an equally inherent dynamic range of less than 40dB there is suddenly an upper corner frequency of 48kHz on the disk, which you would like to attribute to the AT91 pickup system, and which is also reproduced by the AT91.
Nevertheless, a nice try. If you look at your RTA (spectrum) and take a look at snapshots, you can get an idea of the real dynamics of the recording.
I don't like to say it and I don't want to argue with you personally, but with this video you are throwing sand in the eyes of an innocent person. You are making him believe something that is not true.
Apple & Pear comparison. But so be it.
Please compare two identical recordings, one with the non-actively cooled 47k and one with your equally non-actively cooled 150k load resistor or input resistor of the EQ amp. And make the raw data sets available to other forum members for analysis.
That would be kind of you.
Best regards,
HBt.
What is this video supposed to prove Nick?
ft/2 = 48kHz does not mean that on the disk with an inherent signal-to-noise ratio of less than 70dB and an equally inherent dynamic range of less than 40dB there is suddenly an upper corner frequency of 48kHz on the disk, which you would like to attribute to the AT91 pickup system, and which is also reproduced by the AT91.
Nevertheless, a nice try. If you look at your RTA (spectrum) and take a look at snapshots, you can get an idea of the real dynamics of the recording.
I don't like to say it and I don't want to argue with you personally, but with this video you are throwing sand in the eyes of an innocent person. You are making him believe something that is not true.
Apple & Pear comparison. But so be it.
Please compare two identical recordings, one with the non-actively cooled 47k and one with your equally non-actively cooled 150k load resistor or input resistor of the EQ amp. And make the raw data sets available to other forum members for analysis.
That would be kind of you.
Best regards,
HBt.
By 3.1915 times 47k (=150kOhm) alone, you don't lift, there is no change on the mechanical side or on the sound carrier (the record) itself.
Dear Nick,
Where does the constant peak at around 16kHz in the real-time spectrum actually come from? Which hardware did you use for digitization, which chipset, which settings ... etc.pp.
Please no video, sentences would be nice and data, hard facts.
Regards,
HBt.
Where does the constant peak at around 16kHz in the real-time spectrum actually come from? Which hardware did you use for digitization, which chipset, which settings ... etc.pp.
Please no video, sentences would be nice and data, hard facts.
Regards,
HBt.
Testrecord:
https://www.tacet.de/main/seite1.php?language=de&filename=production.php&bestnr=02101
Tell me Nick,
apart from your new promotional video, you guys are a kind of pensioners' regulars' table (means "Stammtisch") and you're the leader of the gang. Is that right?
You know, I have nothing against this leisure activity with extra income - I see big, new SUVs with Ukrainian license plates driving through my state capital every day (I'm a bit surprised, but what's the point) ... but' please just use a test record and a spectrum analyzer or at least a suitable oscilloscope to back up your advertising with comprehensible and credible data and information.
So it will be easy to get a suitable record and transport it to Kiev or wherever your meetings take place - you have a very extensive YouTube channel together, full to bursting.
The proof that your EQ enables a very simple MM system to reproduce sinusoidal oscillations of frequencies greater than or equal to 20kHz at almost full scale is still missing. Do you assume that the inner radii can still contain spectral components or even pure tones of more than 15kHz with significant levels (mechanical modulations)?
All the best,
HBt.
https://www.tacet.de/main/seite1.php?language=de&filename=production.php&bestnr=02101
Tell me Nick,
apart from your new promotional video, you guys are a kind of pensioners' regulars' table (means "Stammtisch") and you're the leader of the gang. Is that right?
You know, I have nothing against this leisure activity with extra income - I see big, new SUVs with Ukrainian license plates driving through my state capital every day (I'm a bit surprised, but what's the point) ... but' please just use a test record and a spectrum analyzer or at least a suitable oscilloscope to back up your advertising with comprehensible and credible data and information.
So it will be easy to get a suitable record and transport it to Kiev or wherever your meetings take place - you have a very extensive YouTube channel together, full to bursting.
The proof that your EQ enables a very simple MM system to reproduce sinusoidal oscillations of frequencies greater than or equal to 20kHz at almost full scale is still missing. Do you assume that the inner radii can still contain spectral components or even pure tones of more than 15kHz with significant levels (mechanical modulations)?
All the best,
HBt.
To the digitized sample song:
I have to say, everything in the spectrum above the 16kHz continuous peak and up to the fT/2 limit is quite interesting. Where do these spectral components come from? In some cases, they clearly range from -100dBu(fs) to greater than -80dBu(fs), which is interesting.
The usual frequency ranges of natural instruments, voices and noises are well known, so I wouldn't expect anything more up there - it's not audible to us humans anyway.
I have to say, everything in the spectrum above the 16kHz continuous peak and up to the fT/2 limit is quite interesting. Where do these spectral components come from? In some cases, they clearly range from -100dBu(fs) to greater than -80dBu(fs), which is interesting.
The usual frequency ranges of natural instruments, voices and noises are well known, so I wouldn't expect anything more up there - it's not audible to us humans anyway.
Because the eternal sand-in-the-eyes mentality really bothers me, I've now taken a very close look at an old digital copy (myself) of the following record:
PHILIPS 412 611-1
Gershwin
Rhapsody in Blue
An American in Paris
Piano Concerto in F
Pittsburgh Symphony Orchestra
André Previn
1985
Digital copy without editing 10/2011, System Denon DL-103 -> TASCAM.
I don't want to explain to anyone how to view and analyze the raw data, but you don't do it the way shown in the video above. Anyway, I don't want to start an argument, at this moment I'm only interested in the actual DYNAMIC of this LP and on my copy it's 56dB at best.
The disco record Nick examined(?) is said to achieve 86dB, sampled with the cheapest MM I know and with which I myself used in the 1980s.
Whoever believes it will be blessed.
That's also the end of the matter for me.
Kind Regards,
HBt.
PHILIPS 412 611-1
Gershwin
Rhapsody in Blue
An American in Paris
Piano Concerto in F
Pittsburgh Symphony Orchestra
André Previn
1985
Digital copy without editing 10/2011, System Denon DL-103 -> TASCAM.
I don't want to explain to anyone how to view and analyze the raw data, but you don't do it the way shown in the video above. Anyway, I don't want to start an argument, at this moment I'm only interested in the actual DYNAMIC of this LP and on my copy it's 56dB at best.
The disco record Nick examined(?) is said to achieve 86dB, sampled with the cheapest MM I know and with which I myself used in the 1980s.
Whoever believes it will be blessed.
That's also the end of the matter for me.
Kind Regards,
HBt.
Addition
Side Two "Piano Concerto in F major"
Second Set "Adagio"
It's better not to talk about the dynamics (or SNR) in the raw state, but after I took a fingerprint of the groove noise and hiss - with subsequent 70% noise reduction in post-processing and untouched -6dB leveling, my data set now easily achieves >86dB.
All in the classic CD audio format 16Bit / 44.1kHz. No Problem.
Side Two "Piano Concerto in F major"
Second Set "Adagio"
It's better not to talk about the dynamics (or SNR) in the raw state, but after I took a fingerprint of the groove noise and hiss - with subsequent 70% noise reduction in post-processing and untouched -6dB leveling, my data set now easily achieves >86dB.
All in the classic CD audio format 16Bit / 44.1kHz. No Problem.