Wikipedia:Reference desk/Archives/Miscellaneous/2024 May 29

= May 29 =

Is framing the bag and hanging it on the wall reusing it or recycling?
If you've been to Trader Joe's a couple times, the bag asks you this. 47.153.138.166 (talk) 02:06, 29 May 2024 (UTC)
 * I don't know how a bag would ask you something. However, per Recycling, what you're describing would be "reuse". Recycling typically involves breaking down the source into component materials. ←Baseball Bugs What's up, Doc? carrots→ 03:45, 29 May 2024 (UTC)
 * Technically, it would be repurposing. Reusing is simply employing something for its designated purpose multiple times, repurposing is finding a new use for it.--User:Khajidha (talk) (contributions) 11:27, 29 May 2024 (UTC)
 * Assuming the framed bag is "art", it seems like it would be upcycling. Matt Deres (talk) 17:42, 30 May 2024 (UTC)
 * OP, you're leaving out loads of context. The caption "Is framing the bag and hanging it on the wall reusing it or recycling?" appears in a speech balloon, spoken by one child to another during a picnic.  This image is considered a form of art.  I don't know the full story  (but I do know someone who does, so I might be able to get the inside scoop soon), but the whole thing follows a motif that they use in their packaging and local advertisements. Given what we know so far, Matt Deres' answer appears legit and relevant.  Since the bag is framed as art, the answer is upcycling, which is a form of reuse. Viriditas (talk) 20:27, 10 June 2024 (UTC)

Naively-cascaded biquad bandpasses vs Butterworth bandpass filters
What's the point of using Butterworth filter design for IIR filter bank spectrum analyzer if simply stacking biquads (w/ exact same properties for each stages) many times (which is what I've implemented in "Analog-style analyzer" mode on this filterbank-based audio spectrum project) is good enough? And what are advantages and disadvantages of naively cascading biquads over using "real" Butterworth bandpass filters for filter bank-based audio spectrum analyzers? And BTW, what is a name for IIR filter design where steeper rolloff is achieved simply by stacking the exact same filter over and over? 114.5.214.236 (talk) 05:50, 29 May 2024 (UTC)
 * Well a Butterworth filter is optimum with spectrum flatness. A design engineer may want to get the "best" out of something, or may just want to do it as cheap or simple as possible. Other consideration such as whether the components are available or stable, or delay is too much can also become relevant. If it's implemented in software then other aspects may come in, such as intellectual property, but component values will be irrelevant. Graeme Bartlett (talk) 22:30, 29 May 2024 (UTC)
 * @Graeme Bartlett True, but what I'm concerned about is more of choice of filter types (e.g. Butterworth, Bessel, and even Linkwitz-Riley) for filter bank-based spectral analysis like 1/3rd octave band spectrum analyzer. BTW, I go for the "cheaper" or more precisely, simpler route, which is simply stacking the bandpass filters many times because I'm not an audio engineer (at least a good one) and the result is just good enough anyway if you don't care about details of the bandpass filter's properties. 114.5.208.150 (talk) 23:44, 29 May 2024 (UTC)
 * Stacking will not optimise the edge roll-off and may have complicated phase shifting. But for your application it doesn't matter. So simpl;icity and cheapness are more important. Perhaps there is an IC that can do the job. If you can find it, it could be very cheap and simple. Graeme Bartlett (talk) 00:55, 30 May 2024 (UTC)
 * Yeah (considering stacking/cascading two time-domain filters is equivalent of squaring its frequency response) but obviously, since this question is related to this relevant CodePen project, I'm talking about this filter bank design implemented in software (which is digital obviously) strictly speaking. 114.5.211.132 (talk) 04:06, 30 May 2024 (UTC)

Tango (soccer ball)
Hello. If I remember correctly, for a certain period, the Tango was also the official ball of the old European Cup finals (the current Champions League). Since when and for how many years? Thank you very much. 93.148.11.229 (talk) 19:52, 29 May 2024 (UTC)


 * See Adidas Tango 41.23.55.195 (talk) 05:34, 30 May 2024 (UTC)