|
认证分为Basic 和 premium
两种级别
premium
测试项目与标准:
|
Requirement
|
Value
|
Frequency
range at 48KHz and above (4)
|
|
THD+N
|
<= -80 dB FS
|
[20 Hz,20 KHz]
|
|
Dynamic range with
signal present
|
<= 90 dB FS A-weight
|
[20 Hz,20 KHz]
|
|
Magnitude Response
|
<=+- .25 dB ripple
(.5dB peak to peak delta), 1 dB at upper band edge, 3dB at
lower band edge
|
[20 Hz,20 KHz] (5)
|
|
Sampling frequency
accuracy
|
0.02%.
|
|
|
Line output cross-talk
|
<= -70 dB
|
[20 Hz,20 KHz]
|
|
Full scale output
voltage
|
>= 1 Vrms
|
|
|
Noise level during
system activity
|
<=-90 dB FS A-weight
|
|
|
Interchannel phase
delay
|
30
degrees or 12.5 microseconds, whichever is greater
|
[20 Hz,20 KHz]
|
|
