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Audio definition and psychology II

FeaturedAudio definition and psychology II

Another aspect of when some manufacturers and media providers think methods to create more sales emerges materialized in technical specifications without respecting the logic nor the energy resources. That way 192kHz for audio sample rate (in one second) must be better than 44.1kHz, but newly is it?

According to the theory, there's a known system to reproduce audio and it's based on the so-called Nyquist sampling theorem, Nyquist-Shannon sampling theorem or simply “sampling theorem”. Decades ago some engineers tried to establish viable methods for converting analog signals to the digital domain. From Wikipedia: “In other words, a bandlimited function can be perfectly reconstructed from a countable sequence of samples if the bandlimit, B, is no greater than half the sampling rate (samples per second).”

For those not accustomed to these terms, the sample rate is the quantity of numbers (samples) for representing an audio signal in one second. A 44.1kHz signal has 44.100 different numbers in one second, and if you remember the last part of the above sentence, “no greater than half the sampling rate”, it means that with this resolution a 22.05kHz (half of 44.1kHz) signal could be reproduced, within mathematical exactness.

In other article we were talking about the maximum frequency that a human ear system perceives, and it should be below 22.05kHz. Then, the highest pitch for a grand concert piano is below 5kHz, so three times more, 15kHz, is really, really high.

Nevertheless different markets and brands were using sample rate resolution to claim the usual renovation of obsolete products, bringing more earnings, but also electronic waste and most of the time more energy demand for handling that extra resolution.

Some brands are using some curious sentences for marketing high resolution audio and we still encourage the A-B double blind listening tests. It was already done, without surprises. It's true that a trained mixing professional with high end equipment could perceive differences with more ease, but admitting that 95% of the time sounds the same and a little extra bright could be simulated with equalization or perhaps listening position.

You'll rediscover the music with HD Audio

It's difficult to handle sentences like this; is it really marketing?

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