User guide

32
ASUS Essence One Series
Right
Audio Precision 07/15/11 10:48:30
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Appendix: Glossary
• NoiseLevel
The level of any undesired system noise signals over the audio spectrum, including AC
mains hum, white noises, stray magnetic eld, etc.
• SNR
Signal-to-Noise Ratio, the ratio of the maximum amplitude signal to the sum of the noise
energy. The higher, the better.
• THD+N
Total Harmonic Distortion plus Noise, measured by attenuating the fundamental signal
with a narrow band notch lter, then measuring the remaining signal which consists
of harmonics of various order. This implies the linearity of the audio converter and the
lower, the better.
• FrequencyResponse
A measure of a devices ability to respond to a xed input voltage, at dierent input
frequencies, and the dierence in amplitude reproduced for each frequency. The atter
curve at wider frequency range is better.
• DynamicRange
The dierence, usually expressed in dB, between the highest and lowest amplitude
portions of a signal which a device can linearly handle. Ideally it should be very close to
SNR value and the higher, the better.
• Crosstalk
Unwanted signal coupling from another channel of stereo or multi-channel
transmission. The lower value is better.