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Noise Problem Indicated in Computer Sound Cards Used as Hi-Fi Recording Devices

Matusiak M.

Journal of Applied Computer Science Methods

2010

Vol. 2 No. 2

191--199

A sound reception is one of important human perceptions and a contact with the surrounded world. Now computer devices are the main equipment to almost perfectly record and playback a wide range of sounds. Music or sound cards play the central role in this process. The Author has tested several cards concentrating the attention specially on their external versions but internal versions were also investigated for comparison. Usually specially constructed external sound cards are better than much compromised internal versions built directly other electronic circuits on the computer mainboard. It was proved during experiments measuring noise parameters – not always. A simplicity of the construction and other digital circuits closeness create difficult conditions for a noiseless action but in a popular class equipment only. Three external cards, one of PCI interfaces E-MU - 0404 for studio recording and two of USB interface, potentially worse designed by Creative Labs - Sound Blaster Connect and by Lexicon - Alpha. All Hi-Fidelity requirements are performed by each card but noise levels are different. Conclusions are shortly presented here: 1. Built-in sound cards, specialized for Hi-Fi recording are better with noise parameters than external USB devices 2. The newer built-in card (Dell Studio laptop) is only a little bit worse than special professional card by Creative Professional (E-MU 0404) 3. USB cards include additional preamps (very useful) but present in noise charts ad-ditional interferences (peaks) and its noises are a few dB bigger 4. Newer USB cards (Lexicon Alpha) are much better than older (Sound Blaster Connect). The noise difference is up to 10 dB (abt. 3 times) Results are clearly shown using tables, charts and mathematical formulas derived from own experiments.