Low Register Tuning Accuracy with PianoSens
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- Опубліковано 12 вер 2024
- PianoSens.com Tuners generally agree with me that the benefits are significant for tuning accuracy with PianoSens in the upper register of the piano where acoustic false beats are eliminated with the sensor vs the mic. However, astonishingly there are huge variances tuning in the low register due to suppressed partials with the mic. These variances I show can be as much as 1 cent.
Paul,
Yes, I suspect that is the case. Considering the fact that a soundboard panel (not installed in the case) typically will vibrate actively at no lower than about 49hz (roughly an octave above A0), and when installed in the piano case that base frequency (unloaded) jumps up to nearly 60hz generally speaking.
So except in the case of an extremely large instrument, the ability to reproduce those low fundamentals should be quite impossible. Or if able to, quite inaudible to our ears or microphones. Therefore our brain "fills in" the missing stuff and we "hear" those low frequencies.
Even though (at this time) I am a dedicated analog/aural tuner, I have long suspected that acoustic anomalies including absence of various partials in certain notes has an adverse effect on my ability to tune some notes accurately. My proof of this is when I can't hear the 6:3 octave partials clearly (down low) and I try to "ghost" it and it's not there. One note above it's fine, but on this note it's gone. I have to use another interval or "fake it" to the best of my ability.
I'm looking forward to trying this thing out. When Steve told me it has a headphone jack that sealed the deal for me. I see this as an innovation with numerous potentials.
Peter Grey Piano Doctor
This also proves that there IS a fundamental of the note, not that it is absent. This is a misconception that there is no fundamental in the lower bass notes. The piano may not be able to respond to the string movement due to the design, and thus not create the fundamental frequency into sound.
The fundamental isn’t audible but yeah it’s always there in some extent.
On a great concert grand, the fundamental is about 9 dB down in the lowest notes, and that is VERY audible. My research and measurements prove that and there is an unfortunate 'myth' of the so-called missing fundamental. I have shaken up people with my measurements and results. It's hard to change people's opinions even with the measurements and proof.
@@PianoSens-ey8jb 9db doesn't sound like much but human hearing sensitivity diminishes very fast in the sub 100Hz range. So realistically it's probably "audibly" 20 or 30dB lower compared to your second and third harmonics.
And missing fundamental IS a thing... its just the concept that you can trick someone into thinking a note is lower than it actually is by synthesizing a note that begins on a 1st, 2nd, or higher overtone.
It is extremely apparent in the time domain view as the periodicity occurs and is very easy to see, the periods are the fundamental. So, the 'missing fundamental' is a myth propagated by people who are not signal processing engineers and who have not done their homework and not done careful measurement experiments on a large concert grand. I have a whole slide set on this subject. Everyone is simply 'wrong' who have not studied it as I have. Sadly.@@Jwellsuhhuh
I understand, but what I mean is that missing fundamental is still a concept applicable to synthesized sounds, despite obviously not applying to the vast majority of acoustic signals like pianos.
Also keep in mind that everyone has differing perspectives on the matter that are all equally relevant and appropriate. Most people tend to prioritize what their own ears hear, despite them being very inconsistent and variable from person to person. Because what the ear hears is arguably what's most important. Yes the measurements can tell you a whole different story but its hard to generalize those uncompensated findings to the unpredictable world of human hearing.@@PianoSens-ey8jb