Inmathematics, an equaliser is a set of arguments where two or more functions have equal values.An equaliser is the solution set of an equation.In certain contexts, a difference kernel is the equaliser of exactly two functions.
Of course, all of this presumes an algebraic context where the kernel of a function is the preimage of zero under that function; that is not true in all situations.However, the terminology "difference kernel" has no other meaning.
In any universal algebraic category, including the categories where difference kernels are used, as well as the category of sets itself, the object E can always be taken to be the ordinary notion of equaliser, and the morphism eq can in that case be taken to be the inclusion function of E as a subset of X.
The generalisation of this to more than two morphisms is straightforward; simply use a larger diagram with more morphisms in it.The degenerate case of only one morphism is also straightforward; then eq can be any isomorphism from an object E to X.
The correct diagram for the degenerate case with no morphisms is slightly subtle: one might initially draw the diagram as consisting of the objects X and Y and no morphisms. This is incorrect, however, since the limit of such a diagram is the product of X and Y, rather than the equaliser. (And indeed products and equalisers are different concepts: the set-theoretic definition of product doesn't agree with the set-theoretic definition of the equaliser mentioned above, hence they are actually different.) Instead, the appropriate insight is that every equaliser diagram is fundamentally concerned with X, including Y only because Y is the codomain of morphisms which appear in the diagram. With this view, we see that if there are no morphisms involved, Y does not make an appearance and the equaliser diagram consists of X alone. The limit of this diagram is then any isomorphism between E and X.
It can be proved that any equaliser in any category is a monomorphism.If the converse holds in a given category, then that category is said to be regular (in the sense of monomorphisms).More generally, a regular monomorphism in any category is any morphism m that is an equaliser of some set of morphisms.Some authors require more strictly that m be a binary equaliser, that is an equaliser of exactly two morphisms.However, if the category in question is complete, then both definitions agree.
Hi, the equaliser on my smart TV has suddenly stopped working. I have tried resetting sound and taking back to factory settings. I contacted Samsung via chat and they had no solutions other than to pay for a costly 'repair'. The only thing that I can put it down to is the ITV app does not work on this model of TV and after I tried to use it the sound on my TV went crazy - loud, echoey and distorted. It also made the picture juddery and out of sync. I had to to do channel reset to get it back to normal. The equaliser definitely used to work! Any ideas? Thank you.
@janeyjaney: The Equaliser will be greyed out and unavailable when some Sound Modes are active. If you head to Settings > Sound > Sound Mode, and set this to 'Standard', you should then be able to access the Equaliser via Sound > Expert Settings > Equaliser. Please close any apps you have open when attempting these steps, as this can also restrict access to some picture and sound settings.
Hi Andrew, no it's not greyed out. Altering the equaliser settings makes no difference whatsoever. They used to work and I simply don't understand why they don't now. TV sounds rubbish without more bass.
I've just got a new pair of wireless earbuds. I see that Poweramp has equaliser presets for them, so I thought I'd use that.
The thing is, I use the preamp volume setting a lot, for fine volume control. The normal volume control of my phone is often too coarse for what I want. But now, if I alter the preamp volume a little, when the track finishes that gets discarded because Poweramp re-loads the presets for my earbuds (and that includes preamp).
Is there a way to load up the presets for my earbuds just once, and NOT reapply them every time the track changes?
Longer term, there is a Feature Request to allow EQ Presets to be assigned which contain just specific parameters. That would mean you could save a Preset with just the EQ adjustments but no defined Preamp value. You can vote for it here:
Just delete the Preset that's assigned to that device name (long-press on it in the Presets list and tap Delete). Might be an idea a save it again under a different name before you delete the device-assigned copy though, so you've still got the EQ settings available under a new name.
The Sonalksis SV-517 EQ is a seven band 'true analogue' equaliser. Choose from a variety of filter styles, modelling many classic and contemporary analogue responses. Whether you need to add some air to a vocal track, or sweeten an entire mix, the SV-517 EQ is massively flexible, making it suitable for both mixing and mastering environments.
The SV-517 EQ is not an 'esoteric' processor, rather it aspires to the highest quality ideals. As part of the 'SV' range of products from Sonalksis, it follows a design philosophy that aims to maintain traditional analogue processing qualities. Some of the filter circuits are attentively modelled from traditional analogue designs while others are completely new and unique offerings, but by bringing the technology into the digital domain you can simply select the style of filter most appropriate for your programme material.
The SV-517 is modelled on filter circuits where minimal distortion and maximum transparency are a priority. The main strength of this EQ is that the analogue modelling allows it to maintain a traditionally high quality clean but rounded sound, achieving transparency without sounding clinical, which can be a problem with 'digital' EQ's, which often resort to adding faux-distortion in the hope this will warm up the sound.
The SV-517 provides variable-slope high and low cut filters, with up to 24dB/oct cut-off, as well as 5 bands of parametric control with switchable low and high shelving sections. Additionally, you can choose from 3 styles of band-pass and 3 styles of shelving filter, each with a switchable asymmetrical cut/boost characteristic. In combination there are therefore 14 different styles of filter, across 7 filter bands. Each style of filter was carefully chosen for a particular sonic aesthetic. The filters are all minimum-phase just like traditional analogue designs, so you can achieve perfectly rounded high or low cuts free from subtle digital phase issues.
Could you please give some guidance on using the equaliser function and also allow it to be altered from the rose app on your phone to allow it to be altered from the listening position. Thanks, Ziggy
If your room has standing waves or too much bass - consider first, to move your speakers.
Rose has no option to correct the signal regarding standing waves.
one option might be, to buy something like MiniDSP with Mic and a software called Dirac.
The MiniDSP can then be put in chain between the Rose and your Amplifier.
Dirac will measure your room, detect in which range you have too much energy in your room, and correct the signal only in this range. with less energy, the standing wave should not react so strong in your room.
As all other playing devices would not profit from this, it is better to have the DSP between the Pre Amp and the Amp. But this might lead into more costs.
there are good products in the market, which do already contain features like Dirac.
Standing waves are given by your room - theres not so much you can do.
I have 2 active Bass Traps (PSI Audio, AVAA C20) which reduced most of the negative energy in my room - but they were expensive.
Rose will for sure not offer an app like an equalizer for their products.
Thats what I think about your problems.
Thanks for your thoughts, I have tried different speaker positions but still have excessive bass. I have bought the excellent Rose 201E which has a built in amp so would be unable to try your suggestion.
New with Muso 2 and found that there are no in-built equaliser options within Muso or its app. I usually stream my music using Spotify and Youtube Music, and sometimes play Internet Radio on Muso, which sounds great; however today I streamed one of the tracks from my music app on my phone with equaliser on, and the enhancement in quality and output is quite visible(audible?)
But I have found delving into graphic equalisers a bit puzzling as there is very little reviewing of them on the net and discussions are generally about their use for PA. not quality music listening. Most audio purists throw up their hands in horror at their use, something very silly as all sorts of gadgetry like this is used in making recordings in the first place.
But of course the AUMEO units are designed for portables so will most likely be used there. I recently acquired a SONY ZX100 and can hear the improvement in AQ over the A series (which are very very good) so my hearing is not completely shot, just seriously challenged sometimes.
I am currently using this open source app. I needed a means to get an EQ to sit in between Windows audio and my cisco softphone which I use on a daily basis
to speak with customers. Particularly calling customers who answer on cell phones / especially those from overseas. I can adjust the EQ on the fly.
OK, so now age 85, I have had the need for hearing assistance since working as a technician for big guns during the Korean thing. Before Post Polio Sequale weakened my diaphragm and flattened my vocal folds I was a long time singer. My awareness of audio equipment has paid great rewards in my ability to determine the best route for me in equipment.
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