Sorry for being a bit slow, but now I’m starting to get the full picture of what you did.
Instead of nulling all FFT values above 22050 and doing an IFFT while keeping the length intact, you simply shortened the FFT to 22050 and then did the IFFT to get two steps in one go, filtering and decimation to 44.100.
That’s why you could not produce the HP version that I asked you to produce.
It would be simple with your Python model to compare your previous results by not decimating the FFT to 22050 but only nulling all values above that frequency and do the IFFT with the full length FFT.
Then again do the envelope subtraction of both signals still in the original sampling rate and see if and how it differs from your downsampled envelope image.
Hans
You mean they had a design review and chose the right part for each stage? Who'da thunk it...
The old records up until c. 1950 or so were band width limited at about 6 kHz because the tracking weights and carts damaged the HF above that so severely after a few plays it basically render then useless. It was only after the advent of better carts (still not at the quality of stuff produced after say the 1970’s) that the response was able to be extended. The big breakthrough came with the require to wider Bsnd width and better tracking demanded by quadraphonic systems.
Some of the best phono carts that were gentle on your plastic were made by Shure. Just like CD, the best drives are gone.... so is Shure carts. First the best models went and now all are gone;
Shure announced all phono cartridge models will be discontinued, but Shure's microphone and headphone production is unaffected. ... Shure currently lists six cartridge models -- M44-7, M97xE, M92E, SC35C, M44G, Whitelabel -- and inventory may last through summer, according to Brunner.May 2, 2018
-Richard
Shure announced all phono cartridge models will be discontinued, but Shure's microphone and headphone production is unaffected. ... Shure currently lists six cartridge models -- M44-7, M97xE, M92E, SC35C, M44G, Whitelabel -- and inventory may last through summer, according to Brunner.May 2, 2018
-Richard
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I think you mean some of the best FUD on stylus wear was spread by shure? Walton worked out that wear wasn't an issue in the late 50s as long as your effective tip mass was under 1mg
I think everyone started doing this Bill once the newer, lower tracking weight carts came along in the 50's with the advent of the 331/3 RPM LP's - but Sure probably led the pack from what I've read in some of the old adverts.
My cart has a recommended tracking weight of 1.4-1.8 g - I'm tracking at c. 1.5g (the Ortofon Red with the black Shibata stylus - good trick that!)
Richard, I owned a V15 once - got lost in one of my many moves. But, I'd say there are some seriously good carts around nowadays - improved magnetics, better manufacturing and styli greatly improved after the 70's.
Ortofon seem to be going great guns as just one example, and then there's the Japanese stuff (Excel who manufacture for others). I was pretty impressed with the Hana ML when I had it.
Given all the hoo ha about digital - and my expectation that 24/96 or 24/192 should be as close to perfection as is possible in a decent implementation - and what you can and cannot hear over the last 20 pages or so, I'm never ever going to take the trouble of designing a DAC, although I've made one or two abortive attempts including purchasing an XMOS dev kit.
Clearly even if its the best possible spec, someone will diss it because they can hear something at -120 dB. At least with vinyl, there's no expectation of perfection - just aural pleasure. Two entirely different things!
My cart has a recommended tracking weight of 1.4-1.8 g - I'm tracking at c. 1.5g (the Ortofon Red with the black Shibata stylus - good trick that!)
Richard, I owned a V15 once - got lost in one of my many moves. But, I'd say there are some seriously good carts around nowadays - improved magnetics, better manufacturing and styli greatly improved after the 70's.
Ortofon seem to be going great guns as just one example, and then there's the Japanese stuff (Excel who manufacture for others). I was pretty impressed with the Hana ML when I had it.
Given all the hoo ha about digital - and my expectation that 24/96 or 24/192 should be as close to perfection as is possible in a decent implementation - and what you can and cannot hear over the last 20 pages or so, I'm never ever going to take the trouble of designing a DAC, although I've made one or two abortive attempts including purchasing an XMOS dev kit.
Clearly even if its the best possible spec, someone will diss it because they can hear something at -120 dB. At least with vinyl, there's no expectation of perfection - just aural pleasure. Two entirely different things!
Everyone jumped on the bandwagon as they had quad cartridge tech that they needed to amortise! And I have an irrational affection for some of the silly low mass setups of the time. But the science says that anything lighter than an ortofon SPU won't wear your records out.
Well I agree with that - I've had no wear out issues from playing any of my LP's and some are 35 years old. They weren't played for 15 years odd, but after cleaning most of them are as good as new.
When does a turntable stylus need to be replaced? Most manufacturers recommend changing your stylus at around 800-1000 hours of record playing time. So if you're using your turntable for an a couple hours or so per day on average, ideally you should be changing the stylus every year (1000 hrs).
If you havent changed your stylus in more than 1000 hours rest assured you are damaging your plastic. I dont know what Worn Out plastic means but the distortion measurably increased on it with repeated playing.
Many cart are fairly costly to replace frequently as necessary. You can get a used Orto SPU for as low as $1100 USD.
Shure --
The average flat on a worn diamond spherical tip measured .00145". Even this amount of wear results in distortion, increased noise and excessive record wear. To obtain a flat of .00075" required 140 hours of use. To obtain a flat of .001" required 300 hours of use. To obtain a flat of .00125" required 700 hours of use. To obtain a flat of .0015" required 1,500 hours of average use; this degree of wear resulted in reduced tonal response, high noise level, greatly increased distortion and a considerable amount of record wear.
-Richard
If you havent changed your stylus in more than 1000 hours rest assured you are damaging your plastic. I dont know what Worn Out plastic means but the distortion measurably increased on it with repeated playing.
Many cart are fairly costly to replace frequently as necessary. You can get a used Orto SPU for as low as $1100 USD.
Shure --
The average flat on a worn diamond spherical tip measured .00145". Even this amount of wear results in distortion, increased noise and excessive record wear. To obtain a flat of .00075" required 140 hours of use. To obtain a flat of .001" required 300 hours of use. To obtain a flat of .00125" required 700 hours of use. To obtain a flat of .0015" required 1,500 hours of average use; this degree of wear resulted in reduced tonal response, high noise level, greatly increased distortion and a considerable amount of record wear.
-Richard
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All depends. The Gyger profiles are good for around 2500 hours.
And you can pay stupid money for cartridges. But there are affordable solutions as well (as much as vinyl can be)
Oh wow. So you get to replaces it every couple years then. You can replace the tip but the increased distortion on the plastic is cumulative. Just gets worse.
-Richard
You should see the racing cars, either Formula 1 or whatever else, and see the money spent per lap
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