That would be T-E aka "ma-ybe" please 😀.
Otherwise, good question, I guess I do not care to look for those "interesting topics". Or perhaps I have a subliminal urge to mop the forum floor after the usual suspects are using it for improper purposes.
OTOH, I find the ASR forum boring, there is no fun to discuss over a quarter of dB in the SNR, if that's all what's left of audio science, then...
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I happen to think the Bybee Music Rail patent, falls entirely within conventional science and contains zero snake oil.
It appears Jack hired some EEs to diversify from putting all his eggs in one snake-oil filled basket.
Still, I find the USPTO has set the bar way too low.
I agree.
It also clearly shows that anything could be patented, I'm ready to place a bet I could patent today a differential stage, if carefully drawn, explained, and placed against prior art.
Thanks for the further info, KSTR. Of course it is the overlap that is problematic. The idea is both simple and wonderful!
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Bang and Olufsen built a speaker line with a "filler driver" between woofer and midrange, fed a very narrow band signal at the crossover frequency. HP and LP filters for the woofer and midrange were 12dB/oct with a Q of 0.5 and all drivers were connected in the same DC polarity. These speakers could reproduce a square wave.
For an active filter, a biquad could be used to generate LP, filler, and HP and the filler could be added to one of the other filter outputs, eliminating the extra driver.
I wish I could remember the names of the guy from B&O and the guy who developed the active filter version, but it's gone.
All good fortune,
Chris
For an active filter, a biquad could be used to generate LP, filler, and HP and the filler could be added to one of the other filter outputs, eliminating the extra driver.
I wish I could remember the names of the guy from B&O and the guy who developed the active filter version, but it's gone.
All good fortune,
Chris
We met at the 1976 Zurich AES, but I don't recall this particular session, and I don't think it made to the journal.
Bill, you know what, I order the XLR Vahalla’s from Ali Express and compare them to the real ones.
That could provide some nice measured and auditioned information.
Other than stranded cables, in the Valhalla’s the conductors are each separately isolated from each other.
I also have stranded XLR’s that can be used into the review
Let’s see what it might bring.
Hans
Thank you, that’s exactly what I had in mind.
You can use steep filters, not just 6dB/oct, preventing large overlaps.
Hans
Eric Baekgaard (1977)
I was searching to find commercial implementation of the x-over ideas of US4015089 (1977) Linear phase response multi-way speaker system and I found the Technics SB-7000 (1976) and SB-7070 (1978).
Has anyone heard those? Opinions?
George
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That's him! Thanks.
The Technics' look pretty conventional, unlike the patent?
Much thanks, as always,
Chris
ps: the other guy might have been Samuel Groner
The Technics' look pretty conventional, unlike the patent?
Much thanks, as always,
Chris
ps: the other guy might have been Samuel Groner
Hans, making a 'transient perfect' (can pass square waves when summed) filter, appears to always require an overlap, or a filler. Please read carefully the provided data, or try a computer simulation for yourself. There is 'no free lunch!'
John, I would not condemn a product as snake oil without clear intent of deception. Perhaps not well understood would be more appropriate for products like OCC silver interconnect wire.
I thought so; the Alexander amplifier CFA topology (patented at the time) is also claimed, fig. 4c.
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