|
Audio Artillery Reviews, excitement, and desire for hardware and software |
|
LinkBack | Topic Tools | Rate Topic |
|
|||
How dumb do they think we are???
|
|
|||
http://www.x-fi.com/whatis/
There's a demo there..... but considering it's streaming how can they really expect to demo it's ACTUAL quality... or supposed quality at the very least. |
|
|||
The human ear can't detect any difference past the sample rate of 22,050Hz because the range of human hearing is around 20Hz to 20,000Hz. However, the Nyquist Theorem states that in order to produce an accurate representation of a given frequency of sound, each cycle of the sound's vibration must be sampled a minimum of two times. That is why the most widely accepted sample rate is 44,100Hz (exactly twice than what we can hear). You may ask why that is? And you may wonder why ASIO exists with a sample rate of 48,000Hz? And maybe why there is now 192,000Hz? We can't hear anything REMOTELY close to what these new sample rates are producing. Our eardrums can't vibrate fast enough to capture all those samples.
Here's another reason why higher is better: Higher sample rates CHANGE how you PERCEIVE frequencies. If you record something in 96kHz - then the whole perception of the audio frequency changes... and you start "feeling" the sound. Higher rates produce more of an "air" feel to the audio you are perceiving and add more "dynamic depth" that you can feel in your chest... The reason why I told you this is because I see now that all the new X-Fi cards have 192kHz stereo outputs and 96kHz sample rates... which is starting to become the new standard. Of course we can't hear anything past 20kHz, but we can surely FEEL the difference of 96kHz for example. So I wouldn't be ridiculing their diagram, because most of the idiots on this planet don't even have a clue as to what's going on. Their diagram is just a visual representation of the science involved in outputting audio at higher sample rates in all the new X-Fi cards. |
|
|||
Audio waveforms are commonly sampled at 44.1k samples/s (CD) or 48k samples/s (professional audio). This is usually sufficient for any practical purpose, since the human auditory system is capable of discerning sounds up to about 15-20 kHz.
The recent trend towards higher sampling rates, at two or four times this basic requirement, has not been justified theoretically, or shown to make any audible difference, even under the most critical listening conditions. Nevertheless, a lot of 96kHz equipment is now used in studio recording, and 'superaudio' formats are being promised to consumers, mostly as a DVD option. Most articles purporting to justify a need for more than 48 kHz state that the 'dynamic range' of 16-bit audio is 96dB, a figure commonly derived from the simple ratio of quantizing level to full-scale level, which is 216, or 65536. This calculation fails to take into account the fact that peak level is not maximum permitted sine-wave signal level, and quantizing step size is not rms noise level, and even if it were it would not represent loudness, without the application of the ITU-R 468 noise weighting function. A proper analysis of typical programme levels throughout the audio chain reveals the fact that the capabilities of well engineered 16-bit material far exceed those of the very best hi-fi systems, with the microphone noise and loudspeaker headroom being the real limiting factors and this is with originally high quality recorded wave files. Imagine running this thing on your 192 mp3s. All it does is act like those "enhancment" plugs that come with winamp. Analyzes the song freq wise and pumps in some high low and 3d. As my teacher said in audio school... you cant polish a turd. |
|
|