We Need To Talk About Ones And Zeroes

@deep_333 

where some dudes are telling him that there is no musical information below 30hz (facepalm) and a sub getting down to 10hz is meaningless...

The organ in the Sydney Town Hall has a 64-foot pipe which can be felt if not heard at about 10-Hz.  Stuart pianos from Australia can go down to 16-Hz.

Some organs that don't have the space or money for long pipes make use of your 'doppler' effect to produce low notes from two high-frequency (above audble) pipes.  It is really an interference effect, not true doppler which is caused by a speed difference between a source and a listener ...

Richard, i wasn’t just referring to individual instruments like a huge organ that went infrasonic on its own.

I was referring to the same ’interference’ (if we need to use a word) effect that happens on the supertweeting end also occurs on the infrasonic end.

i.e. the case of a 10 hz tone perhaps from 90 hz and a 100 hz tone played together, a 15 hz tone from other pairings and so on....i.e infrasonic ranges that could be affected from frequencies that are typically attributed to the audible range.

Strangely enough, this type of phenomenon was first described to me sometime in the 90s by a Hindustani musician when he was attempting to explain some attributes of a raag he played....I am sure the guy had never seen a measurement tool in his life...stuff that gets passed down to them by word of mouth from his teacher and the one before him and the one before him...I am a violin player and i was always baffled by the sound of their instruments (don’t have another lifetime to spare for learning their things unfortunately).

I visualize it to be an audible "spread" of sorts stemming from tones in supposedly both audible & inaudible ranges

One could ’never be too sure’ like those measurement guys on a certain other forum...y’know. They are so certain about everything and what they do not know yet may not exist apparently (scientists n all!).

The organ in the Sydney Town Hall has a 64-foot pipe which can be felt if not heard at about 10-Hz.  Stuart pianos from Australia can go down to 16-Hz.

Some organs that don’t have the space or money for long pipes make use of your ’doppler’ effect to produce low notes from two high-frequency (above audble) pipes.  It is really an interference effect, not true doppler which is caused by a speed difference between a source and a listener ...

@jeffbij re "Even a CD player has safeguards to guard against read errors, it’s called oversampling."

CD error correction is based in Cross Interleave Reed Solomon coding.

Oversampling is primarily used to allow shallower slope anti-aliasing filters.

Wonder if other instruments benefit similarly from super tweeters.

I’ve read that similar to adding sub bass units, super tweeters add and support upper ranges.  Maybe someday I’ll try a Enigma Acoustics Sopranino or a Fyne Audio’s new SuperTrax supertweeter.

@yoyoyaya 

Unfortunately, I am old enough to remember the launch of CD.  An astonishing 10 bits (roughly) are used for every 1 bit of the signal.  The claim is that errors can be detected and corrected for up to 4,000 consecutive bit errors, and there is no obvious discontinuity if 7,000 bits are wrong. As a demonstration, a 1/8 inch hole was drilled right through a CD and it played with no apparent adverse effects.

Philips knew the benefits of four-times oversampling from the get go which is why its early CD players sounded better than the competition.  Oversampling allows much gentler filters to be used.

Philips also recognised the difficulty of trimming resistors in their resistance ladder DACs, and only bothered to decode the most significant 14 bits.

PCM advocates should understand that none of this matters with Direct Stream Digital, where the low pass filter is in the mega-Hertz region and every bit is equally important.