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Appendix: Glossary - Asus Essence One Series User Manual

Hi-fi usb dac (digital-to-analog converter)
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Audio Precision
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B
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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 field, 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 filter, 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 device's ability to respond to a fixed input voltage, at different input
frequencies, and the difference in amplitude reproduced for each frequency. The flatter
curve at wider frequency range is better.
Dynamic Range
The difference, 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.
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