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  • phoronix
    started a topic ALSA: Audio Compression Offloading, Power Savings

    ALSA: Audio Compression Offloading, Power Savings

    Phoronix: ALSA: Audio Compression Offloading, Power Savings

    Besides lots of graphics talks at the GStreamer 2012 Conference, the Advanced Linux Sound Architecture (ALSA) was talked about with a status report and mentions of some features soon to be landing in future Linux kernel releases...

    http://www.phoronix.com/vr.php?view=MTE3MTQ

  • Ancurio
    replied
    Can X11 fight dinosaurs with bare hands?

    Leave a comment:


  • NomadDemon
    replied
    i have xonar dx1 on my personal pc with 2 tosil newmildton 80. i think its ok, but my maudio delt1010LT in studio is 10 times better.

    cant compare xonar to integrated shit or with shit creative. its still way better.

    Leave a comment:


  • gens
    replied
    you will RealNC, when they write the driver part for that card that uses that part of the chip(most support openAL)


    fireface(~1281 Euro):


    Dynamic range DA: 116 dB RMS unweighted, 119 dBA (unmuted)
    THD DA: < -103 dB (< 0.0007 %)
    THD+N DA: < -100 dB (< 0.001 %)
    Crosstalk DA: > 110 dB


    xonar DX(~72 euro):

    Output Signal-to-Noise Ratio (A-Weighted):
    116dB for front-out, 112dB for other channels dB
    Input Signal-to-Noise Ratio (A-Weighted):
    112 dB
    Output THD+N at 1kHz:
    0.00056% (-105dB) for Front-out
    Input THD+N at 1kHz:
    0.0004% (-108dB) for Line-in


    im sorry i cant test them, i dont have the money for a good digital oscilloscope (id be jumping around for joy if i got one)

    to defend the price of you card, its made for low latency routing, lots of throughput, high output impendance etc.
    stuff that dosent matter that much when your playing a game or lissening to your 96k/24bit audio collection
    also the THD on the RME is probably over the whole spectrum
    but i remember xonar


    sorry iv been aggressive, i see you know a lot more about electroacoustics and such then almost all the people i meet, but its still a science and i dont like people that say "your wrong, its not like that" then dont put any real "science" part behind it
    also i hold you for not admiting the importance of phase in 3D positioning, as it is the most part of... 3D audio positioning (even calling me dumb for pushing it when you know room acoustics and multi driver speakers can mess it up)
    (i hope you are not the person that thinks gold plated 99% silver speaker cables make any difference, if you are we have nothing to talk about)

    about the bass you were right, but since bass is kinda direction agnostic(it spreads like the plauge), it has low barring on this topic

    (note, i didnt know RME put a new line since the last time i checked)
    reason why good sound cards are possible cheap now is because transistor(and chips with that) manufacturing technology has gotten more precise making transistors more linear, thus reducing their THD

    transistor base(as in B on the package) design changed a bit with that too lowering transistor input capacitance, making it easier to make lower noise circuits

    less noisy D/A converters + rly high speed opamps = you know the rest
    and its getting cheaper


    if you got an osciloscope, some time and some money, you could test the xonar DG's stereo output (other channels are far lower end)

    i sound a bit like an asus advertisement, but i found only few under 1000Euro cards that can hold up to those numbers (and i trust asus not to fake them since i checked the datasheets on the D/A converters and opamps used; they could still easily fck up the filters and general pcb design, but its a big firm)


    on topic a bit:

    this is great news, it will reduce the cpu/memory usage by some and hopefully remove some jitter from heavier games that use said audio compression
    hope this gets on more drivers

    Leave a comment:


  • gens
    replied
    you will RealNC, when they write the driver part for that card that uses that part of the chip(most support openAL)


    fireface(~1281 Euro):


    Dynamic range DA: 116 dB RMS unweighted, 119 dBA (unmuted)
    THD DA: < -103 dB (< 0.0007 %)
    THD+N DA: < -100 dB (< 0.001 %)
    Crosstalk DA: > 110 dB


    xonar DX(~72 euro):

    Output Signal-to-Noise Ratio (A-Weighted):
    116dB for front-out, 112dB for other channels dB
    Input Signal-to-Noise Ratio (A-Weighted):
    112 dB
    Output THD+N at 1kHz:
    0.00056% (-105dB) for Front-out
    Input THD+N at 1kHz:
    0.0004% (-108dB) for Line-in


    im sorry i cant test them, i dont have the money for a good digital oscilloscope (id be jumping around for joy if i got one)

    to defend the price of you card, its made for low latency routing, lots of throughput, high output impendance etc.
    stuff that dosent matter that much when your playing a game or lissening to your 96k/24bit audio collection
    also the THD on the RME is probably over the whole spectrum
    but i remember some xonar's tests being rather flat too


    sorry iv been aggressive, i see you know a lot more about electroacoustics and such then almost all the people i meet, but its still a science and i dont like people that say "your wrong, its not like that" then dont put any real "science" part behind it
    also i hold you for not admiting the importance of phase in 3D positioning, as it is the most part of... 3D audio positioning (even calling me dumb for pushing it when you know room acoustics and multi driver speakers can mess it up)
    (i hope you are not the person that thinks gold plated 99% silver speaker cables make any difference, if you are we have nothing to talk about)

    about the bass you were right, but since bass is kinda direction agnostic(it spreads like the plauge), it has low barring on this topic

    (note, i didnt know RME put a new line since the last time i checked)
    reason why good sound cards are possible cheap now is because transistor(and chips with that) manufacturing technology has gotten more precise making transistors more linear, thus reducing their THD

    transistor base(as in B on the package) design changed a bit with that too lowering transistor input capacitance, making it easier to make lower noise circuits

    less noisy D/A converters + rly high speed opamps = you know the rest
    and its getting cheaper


    if you got an osciloscope, some time and some money, you could test the xonar DG's stereo output (other channels are far lower end)

    i sound a bit like an asus advertisement, but i found only few under 1000Euro cards that can hold up to those numbers (and i trust asus not to fake them since i checked the datasheets on the D/A converters and opamps used; they could still easily fck up the filters and general pcb design, but its a big firm)


    on topic a bit:

    this is great news, it will reduce the cpu/memory usage by some and hopefully remove some jitter from heavier games that use said audio compression
    hope this gets on more drivers
    Last edited by gens; 08-31-2012, 04:03 PM.

    Leave a comment:


  • RealNC
    replied
    On the Xonar D1 I have here, I can enable a thing called "Dolby Headphone" on Windows (no idea whether that's a DSP thing or just pure software.) And it actually works; when I first tried it, I was expecting some crappy proccessing done to get some form of cheap "surround" illusion, like that "Creative CMSS-3D" thing that never worked. But in fact I was surpised to be able to hear sounds coming from several directions even though the headphones are plain stereo.

    I don't think we'll ever see that on Linux?

    Leave a comment:


  • ninez
    replied
    Originally posted by gens View Post
    so your just telling me you have rly expensive audio equipment and therefore know better then anybody else ?
    No, i did not say that and please don't put words in my mouth, completely misrepresenting my position. :\ i didn't write that since i own expensive equipment that i am somehow better than everyone else - so STFU with fallacious nonsense like that.

    Originally posted by gens View Post
    Originally posted by from very end of paper above
    Combining headphones and a subwoofer for the ideal game audio system

    The part of real world audio headphones can't deliver is the part which comes in through the skin as much as
    through the ears- those energetic roars, rumbles, and booms that shake the furniture and give that certain
    something to the disaster movies we all love.

    These low frequencies aren't directional (the wavelengths are too big to interact with the head and ears) so the gamer can use headphones and a subwoofer together without hurting positional quality. This could be the ideal game audio system.
    So basically, (you say) headphones deliver across the board and are better than any speaker, except (as i pointed out) for the fact that lower-end frequencies don't really come through them, and more importantly (which i will point out now) really low-frequencies are felt more than they are heard - and even this article says for the best experience use a sub-woofer with headphones...interesting.

    Headphones give some extra detail (due to reasons you have pointed out), and they do solve the 'gap' problem between speakers, but that doesn't make them better. In a properly acoustically treated room, with a high-end media/theater/studio surround-sound setup - the experience is much richer, to continue to argue that headphones are better than any speaker is silly, when you consider everything that is involved. I personally find headphones to be a good reference / starting point, but a good set of studio monitors in a decent space is better at the end of the day, and you do miss out if only using headphones.

    Originally posted by gens View Post
    if you look at the specs, the xonar cards i recommended are better on paper then RME and such expensive cards
    (the explanation is... electronics what i doubt you know anything about so i dont wanna confuse you)
    (rightmark says they are better in tests too..)
    if you really think xonar cards are really that good - you live in a fantasy world. they are pretty low end.

    Originally posted by gens View Post
    check out Audio Power Amplifier Design Handbook by Douglas Self
    the part named "Misinformation in Audio" will tell you about some nonsense you see people talk around

    speakers i talked about are special by the fact they are full ranged single driver speakers shaped like a tear(or an egg i guess) to avoid coloring the sound by removing the bouncing of waves off the speakers rims
    nobody was arguing any point on the specific type of speakers you were talking about.

    Originally posted by gens View Post
    headfones also should have more dynamic range and also important hold the phase steady (as they have only one light driver(easier to control with less current, less mass) and not two or 3 that cant be perfectly phase balanced)
    Except they don't have more frequency range and this is why in any studio, you will see expensive studio monitors being used for mixing. headphones are good to a point but limit much of the low frequency range and you tend to not lose much of the body of the sound, for a trade-off or slightly more detail... and we've already been over this.

    Originally posted by gens View Post
    if you rly want to know i do have a shitty sound card, but i have also professional grade big ass concert speakers (they costed a lot, but since i made most the work myself, they still cost a lot(not that the price guarantees quality)) with rly high dynamic range and sensitivity(i can get you papers on them, not that you showed any papers that prove i sayd anything wrong)
    i dont have money for a sound card, but il get a xonar DS for ~40$ that sounds better then your RME (not that anybody can notice the difference)
    Did i say you didn't own some big rig PA? (nope). Again, you live in a fantasy world to think xonar's are good soundcards (in particular you think they are amongst the best it would seem) - when in reality, they are one step up from onboard soundcards. and by the way here is the RME card that i own;

    http://www.rme-audio.de/en_products_fireface_800.php#5

    Please explain to me how ANY xonar actually touches this card (they don't), not in quality, performance or stability/reliability... not to mention you can't even use a xonar in a professional studio and certianly they don't touch RME in terms of quality or features.

    As far as showing white papers, anyone with any background in music production knows that headphones are limiting ,they are good for basic mixing, but eventually you will want to be using proper speakers. So ya, you are wrong to think headphones are better than even the 'best' speakers.

    Originally posted by gens View Post
    you have a studio or you just like black heavy stuff ?
    25+ years of being a musician and used to be an engineer - collected a lot of gear lots of studio equipment, rackmounts, instruments, etc.Other gear for both jamming/playing live and/or recording as well.

    Originally posted by gens View Post
    PS Sennheiser http://www.sennheiserusa.com/around-...id-size_504765
    freq response: 17-22,500 Hz not enough ?
    mind also i think they test against AES standard, meaning 17-22,500Hz +- 3dB what rarely any monitor can do
    ..and yet, in any studio you will will probably be using much higher-end headphones than these (low-end pro grade) and will still want to use your studio monitors as headphones are not good enough, when you need to hear everything, in particular the low-end.

    sorry but no dice and besides we are getting waaayy off topic, continuing is sort of pointless. You think headphones are better than any speaker/sound system, when in reality they don't deliver in the bottom-end and thus don't deliver those particular frequencies properly in the 3d space to be heard via those headphones that are better than any speaker.

    I for one know that sound/music/etc is something that is not only heard but felt, to say that headphones are better than any speaker is ridiculous and it seems you are arguing this point just to argue.

    Leave a comment:


  • gens
    replied
    so your just telling me you have rly expensive audio equipment and therefore know better then anybody else ?

    whitepapers like this one ?
    http://www.fp3d.com/papers/WhyHeadphones.pdf

    if you look at the specs, the xonar cards i recommended are better on paper then RME and such expensive cards
    (the explanation is... electronics what i doubt you know anything about so i dont wanna confuse you)
    (rightmark says they are better in tests too..)

    check out Audio Power Amplifier Design Handbook by Douglas Self
    the part named "Misinformation in Audio" will tell you about some nonsense you see people talk around

    speakers i talked about are special by the fact they are full ranged single driver speakers shaped like a tear(or an egg i guess) to avoid coloring the sound by removing the bouncing of waves off the speakers rims

    headfones also should have more dynamic range and also important hold the phase steady (as they have only one light driver(easier to control with less current, less mass) and not two or 3 that cant be perfectly phase balanced)

    if you rly want to know i do have a shitty sound card, but i have also professional grade big ass concert speakers (they costed a lot, but since i made most the work myself, they still cost a lot(not that the price guarantees quality)) with rly high dynamic range and sensitivity(i can get you papers on them, not that you showed any papers that prove i sayd anything wrong)
    i dont have money for a sound card, but il get a xonar DS for ~40$ that sounds better then your RME (not that anybody can notice the difference)

    you have a studio or you just like black heavy stuff ?

    PS Sennheiser http://www.sennheiserusa.com/around-...id-size_504765
    freq response: 17-22,500 Hz not enough ?
    mind also i think they test against AES standard, meaning 17-22,500Hz +- 3dB what rarely any monitor can do
    Last edited by gens; 08-31-2012, 01:17 PM.

    Leave a comment:


  • ninez
    replied
    Originally posted by gens View Post
    wait, means you only have 96khz music and you only play games that have 96khz sound etc...
    no, in the example i gave (using jackd) both the card and all applications are using 96khz - no resampling. The next part of the example used alsa-to-jack plugin ~ which would resample. The same would be true of games, and music. But my 1st example was to show that you aren't always resampling, as you said.

    Originally posted by gens View Post
    S/N ratio(and hum, that is directly related to it) is important for consumer grade too if you ask me
    for example i got big ass rly sensitive speakers that amplify the hum a lot, on the other hand bad amps put in small speakers amplify it a lot(not because they are better/stronger or whatever but because small speakers dont have a dynamic range to speak off so you turn them up a lot)
    i agree it is important, but less important than what a proaudio / audiophile would want/need.

    Originally posted by gens View Post
    S/N ratio is clearly faked on motherboard sound cards like your IntelHDA since in that case it depends on your power supply(ever heard wierd hissing when copyng a file?)
    on other cards i see it faked by shady test conditions like "96db SNR at 3khz and -9db" what is best for the card, but not standard
    all published data on hardware should be tested by a set standard, in case of audio either ISO or AES
    I only use professional grade audio interfaces (ie: i currently use RME and echoaudio)... IntelHDA (and onboard cards, in general) are crap - so i can't comment on noise you may hear using one. regardless, i was more interested in you actually showing the techniques, comparisons, testing you used to verify these vendors are FOS, but obviously you didn't actually do this.

    Originally posted by gens View Post
    emulation ?
    yes, emulation. 3d sound via a stereo signal, as opposed to a room with multiple sound sources...

    Originally posted by gens View Post
    our ears pick up a lot more dynamic range(they are so sensitive that 0dB is when its so quiet that you cant hear anything else cuz your heart is too loud) then our brain can process
    then our brain "calculates" the position of the source of sound based on phase difference(watch a documentary about sharks, its best explained there)
    I don't need to, i already know this stuff. plus, there are better white papers, articles, etc floating around the web on the subject.


    Originally posted by gens View Post
    20.4 surround or whatever figure they think up next to sell you crap cant work as good as headfones since your room acoustics will mess it all up (to set it up properly you need special speakers(i dont mean expencive, but rly special as in i seen one company that makes them and one school that made a few to teach students acoustics) also a lot of calculations and software control of phase, or you could just use good headphones that eliminate the room part out of the equation)
    I guess you've never heard of acoustic treatment before, eh? (which is common in any studio space, professional hi-end media room, etc). It is true that headphones will give you a 'room-less' listening experience - which can be helpful but ultimately headphones fall short, when it comes mixing or listening. ~ they are a good guide, but you will always have to listen to what you are mixing, eventually under proper studio monitors or speakers for the 'full experience' and full frequency range.

    Originally posted by gens View Post
    to make it clear to you: "good headphones are A LOT better then the best speakers!" cut they sit directly on your ears, and they have rly light membranes(less sound coloration due to better control of the "driver"(the membrane+coil))
    To make it clear to you, I own $300+ headphones and $2000 studio monitors ~ and although i tend to mix using both, speakers offer something VERY important that headphones do NOT - headphones tend to limit or exaggerate the frequency range. ~ this is problematic, since you are limiting what you are actually hearing by wearing them. You miss out on so much of the body of the sound, for a slight trade-off/increase in detail... So honestly, i completely disagree with you here. Headphones are not a lot better then the best speakers....

    Originally posted by gens View Post
    as for the loudness war part, lots of people told me a song is crap encoded cuz its quiet
    "remastering" is usually done by experienced people that know what they do, and they do it for money because publishers want their songs to be louder then the competitions on some average hi-fi stereo system
    that has even more of an effect on encoding lossy audio like mp3 cuz of the psychoacoustic thing i explained earlier
    I wasn't arguing that point. (i actually agree with you here). What i was arguing was that the 'loudness war' had anything to do with encoding (which AFAIK it doesn't), But came to be via professional audio engineers in studios, largely when digital audio recordings became popular (but even arguably before that, in the days of vinyl).

    Originally posted by gens View Post
    also your special 96khz software setup probably still resamples everything to 48khz in software since its probably what your card eats so using it too play youtube takes at least 2 resamplings, bout a bit loosy
    (not that you can hear the difference anyway)
    No, it does not resample to 48khz, i am not using some cheap sound card like you are probably used to using.
    Last edited by ninez; 08-30-2012, 05:00 PM.

    Leave a comment:


  • gens
    replied
    wait, means you only have 96khz music and you only play games that have 96khz sound etc...

    S/N ratio(and hum, that is directly related to it) is important for consumer grade too if you ask me
    for example i got big ass rly sensitive speakers that amplify the hum a lot, on the other hand bad amps put in small speakers amplify it a lot(not because they are better/stronger or whatever but because small speakers dont have a dynamic range to speak off so you turn them up a lot)

    S/N ratio is clearly faked on motherboard sound cards like your IntelHDA since in that case it depends on your power supply(ever heard wierd hissing when copyng a file?)
    on other cards i see it faked by shady test conditions like "96db SNR at 3khz and -9db" what is best for the card, but not standard
    all published data on hardware should be tested by a set standard, in case of audio either ISO or AES

    funny thing is that digital audio sources should have rly good figures, but assholes save money on simple filters(that go on the power supply of the opamp on the soundcard board)

    emulation ?
    our ears pick up a lot more dynamic range(they are so sensitive that 0dB is when its so quiet that you cant hear anything else cuz your heart is too loud) then our brain can process
    then our brain "calculates" the position of the source of sound based on phase difference(watch a documentary about sharks, its best explained there)

    20.4 surround or whatever figure they think up next to sell you crap cant work as good as headfones since your room acoustics will mess it all up
    (to set it up properly you need special speakers(i dont mean expencive, but rly special as in i seen one company that makes them and one school that made a few to teach students acoustics) also a lot of calculations and software control of phase, or you could just use good headphones that eliminate the room part out of the equation)

    to make it clear to you: "good headphones are A LOT better then the best speakers!" cut they sit directly on your ears, and they have rly light membranes(less sound coloration due to better control of the "driver"(the membrane+coil))

    as for the loudness war part, lots of people told me a song is crap encoded cuz its quiet
    "remastering" is usually done by experienced people that know what they do, and they do it for money because publishers want their songs to be louder then the competitions on some average hi-fi stereo system
    that has even more of an effect on encoding lossy audio like mp3 cuz of the psychoacoustic thing i explained earlier

    also your special 96khz software setup probably still resamples everything to 48khz in software since its probably what your card eats so using it too play youtube takes at least 2 resamplings, bout a bit loosy
    (not that you can hear the difference anyway)

    PS i like prodigy, but put a song from them in audacity

    Leave a comment:

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