Wednesday, September 27th 2006
Realtek Audio Codecs Not Rendering True EAX
Todays DailyTech top story says that Realtek Audio Codecs do not render true EAX, at least Analog Devices and Creative Labs claim that. Analog Devices and Creative Labs have made claims that Realtek's high definition audio solutions do not render EAX or EAX2 audio - at least not very well. While Realtek's audio drivers have the proper driver flags to enable EAX and EAX2 in supported games, the listening experience presents a different story. Listening tests demonstrated by Analog Devices and Creative Labs show that Realtek's high definition audio solutions render EAX and EAX2 incorrectly, removing the 3D positional audio aspects and immersion of EAX and EAX2 completely. There's also an issue with some motherboard reviews that use Rightmark 3D Sound for CPU utilization tests and award the onboard audio solution with the lowest utilization the superior solution when the onboard audio solution isn't fully rendering EAX/EAX2 audio. Analog Devices and Creative Labs testing show the Realtek high definition onboard audio showing very little CPU utilization in Rightmark 3D Sound's EAX2 CPU utilization test because it's not applying any EAX2 effects. Currently Realtek is the only known high definition codec manufacturer to render EAX and EAX2 incorrectly as IDT/Sigmatel does not support EAX or EAX2. It is unknown if previous C-Media audio solutions produced before it was acquired by Realtek produce similar results. Analog Devices and Creative Labs made no mention if add-in sound cards such as the recent Dolby Digital Live equipped C-Media CMI8768+ or CMI8778 are affected. Various manufacturers including ASUS, Universal abit, DFI, Gigabyte, MSI and others use Realtek audio solutions.
Source:
DailyTech
35 Comments on Realtek Audio Codecs Not Rendering True EAX
overcast; your being very naive. have you ever actually used a graphic equalizer?
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have you ever actually used a graphic equalizer?
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Yes, I use the X-Fi equalizer all the time, and I used to have one in a car for a system as well.
i wonder if ppl even know what eax stands for...
So far I have owned a creative 6700 6.1 Surround Sound Speakers and right now, I have Creative's Flagship speakers, the S750's.
I have a Onboard Nvidia Soundstorm Solution (MSI K7N2G-ILSR MOBO) and a Creative Audigy 2 ZS.
The nvidia Soundstorm does use a Realtek codec, but a codec is only Digital to Analogue Convertor and Analogue to Digital Convertor (DAC & ADC) in one little pacakge.
What matters most is the sampling rate. The more samples, means clearer sounds. Although, there is one limitation. The recording must have been made utilising a high sample rate, otherwise all that power is useless.
Speaking only on Audio clarity, Creative Audigy 2 ZS wins hands down. There's none of that annoying hiss, and the sounds produced does seem more clear.
As to whether you hear more sounds, thats complete BS. With both the Audigy 2 ZS and the Nvidia Nforce Soundstorm, I hear the same sounds, both on the S750'S and 6700's.
About the Voices - Imgine you have a 7.1 system. Thats 8 channels. If you play music and use CMSS to upmix, that basically means you are using 8 Voices.
That means the X-fi can only play 15 different sounds accross all speakers at once. With Eax, if something happens right infront of you, the centre, left and right speaker is active, with centre speaker being the loudest. That means three voices are being used already.
So theoretcially you could hear 127 different sounds right? Nope, not even close. Game designers have space constraints, and development budgets. Its hard to fit thousands of sounds on, besides, someone has to record the sounds etc, so its very costly. For game developers, its pointless having 127 different sounds going at the same time, because there are only 8 channels, the sounds become merged. Think of 127 people firing an automatic rifle from different positions.... you will not be able to distinguish one from the other.
EAX is just an API. There are many others such as Microsoft DirectSound, Sensaura etc.
An API is just a way for software to re-configure programmable hardware.
CPU Utilisation. There is no accurate way to measure CPU Utilisation, even manufacturers claims should be taken with a pinch of salt. With different hardware and software configurations, there can be an endless range of values. Use what works best for you. My soundstorm had lower CPU utilisation than the Auidgy 2 ZS.
Creative Software is absolutely pants. It looks and feels like a college student coded it.....whilst drunk. There are literally a dozen different "programs" for all the settings, and tabs and pop-up boxes and this and that. Its just way too cluttered and over worked. When a new feature is added, a new program is added, rather than trying to combine into one powerful package. Loading up all these programs take some considerable time too.
On the other hand, Nvidia's software is top notch. One program that loads in no time. All the features are grouped together in a few simple Tabs. One of the main features missing in the Creative software, is Db Level Meter for all the channels. I would like to SEE which channel is the loudest.
Creative are in financial debt. So its quite obvious to start rumours and point out useless facts in the hope that they can persuade the public that creative soundcards are the best.
Creative have been cutting costs anywhere they could. My S750's, which are the flagship speakers from creative, do not even feature a digital input, whilst on two occasions, my Subwoofer/Amp has died for no apparent reason, and a warranty replacement taking place. My faith in Creative products has now dwindled. I will not be purchasing any more creative products, as I am now forced to use my 6700 system, as the subwoofer unit is now DEAD. RIP Creative, you will not be missed!
/me waits for some creative fanboy\bitter creative buyer to jump in saying creative is this and that.
Audigy 2 zs. A great piece of kit, shame it isn't the same on the software side!
Creative 6700 Speakers. Good Value for the price.
Creative Gigaworks s750's. Quite literally the loudest Computer speakers I have heard. But they are not good value for money, as its missing a essential piece...Digital Input, otherwise speakers are great....well while they last.
Nvidia Soundstorm. Cheap, Affordable, Doesn't take up an extra PCI slot, if only it supported 7.1 speaker systems and had better clarity and SNR.