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Audio Quality: Sample Rates, Bit-Depth, Human Physiology & The Golden Ears

studera800.jpgThere is a curious interface between science and the senses. Perception is often wrapped in psychological or emotional elements. This comes in many forms. It can be a group trying to share their impression of the taste of a particular wine. It can be people listening to music. Every persons experience of such things, being filtered by all that is us, both physically and mentally, is unique.

In a recent post I referred to a silly trend in very high sample rate music. This has been promoted by a variety of people, including HD Tracks, a music reseller that promises to provide “audiophile grade high-resolution recordings.” This term they use to generally describe digital recording a structure beyond the 44.1 KHz sampling and 16 bit linear word length defined by the CD format. They offer music at up to 24 bits and 192 KHz sample rate.

I’ve come to regard this trend as having very little merit. I came to this conclusion after many years dealing with digital audio production, after some experimentation and a lot of research. Like everything else on this site, I don’t profess to be any kind of expert, but I am happy to share my experience.

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Xiph.org Offers New CELT Demonstrations

Just before the holidays the folks at Xiph.org put up a nice demonstration page with a lot of detail about their CELT codec. Word of this new offering was announced on the IETF CODEC mailing list.

The samples and explanations provided are first rate. They clearly illustrate the merit in ultra-low-latency for some applications, as well as exemplify how CELT currently fares against other common codecs at a variety of bit-rates and with various types of source material.

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