Fidelity on channel9

Channel9 has a video up right now with Hakon Strande, one of my team’s program managers, talking about next generation audio devices.Most of the video is about HD Audio, the new audio hardware spec from Intel.  They also spend several minutes in the video talking about audio fidelity on Windows in general (not good), and…

0

Why is everything in audio measured in dB?

Short answer: Because the ear measures things in dB.The decibel is nothing more than a ratio between two numbers.  (The unit was originally just a bel, but for audio it was more convenient to use tenths of a bel, hence the SI ‘deci’ prefix)  Mathematically, the number of decibels between two numbers is (20 *…

6

Audio Fidelity: Dynamic Range

I want to talk about noise for a minute.  We all know what noise is, and that we don’t want it in our audio.  Unfortunately, noise is always present, whether we want it or not.  In pseudo-technical terms, noise is random unstructured variations in a signal.  In a digital signal, that variation comes from quantization,…

4

What’s all this ‘fidelity’ stuff about anyway?

Nearly everybody has heard the term “high fidelity”.  Most understand that fidelity is a desirable thing to have, and many believe that the word ‘fidelity’ is synonymous with ‘quality’. In any casual (non-technical) setting, they are the same.  But what does an audio engineer mean when he speaks about fidelity?Audio quality is a subjective measurement…

3

L"Hello, World" // Enter the Audio Fool

Perhaps it’s some kind of initiation ritual.  An obligatory indoctrination task that each new blogger must go through.  An arcane tradition whose origins are soon to be lost to the recesses of time.  Surely the only reason we do it is because tradition demands it, but I prefer to think of it as the online…

0