Read JBL SUB 140P (serv.man4) EMC - CB Certificate online
Report No：W-N-1010002-CY-01-1
Telecom Technology Center
5.1 Evaluation of sound quality
Sound Quality
The criterion of compliance with the requirement is a wanted
to unwanted audio signal ratio≧40 dB at a wanted audio
signal level of 50mW.
If the S/N ratio is less than 43dB,the performance criterion for
audio assessment is the actual S/N ratio minus 3dB.
For AM and FM car radios and for broadcast receiver cards for
computers the criterion is≧26dB at 500mW
to unwanted audio signal ratio≧40 dB at a wanted audio
signal level of 50mW.
If the S/N ratio is less than 43dB,the performance criterion for
audio assessment is the actual S/N ratio minus 3dB.
For AM and FM car radios and for broadcast receiver cards for
computers the criterion is≧26dB at 500mW
5.2 Evaluation of picture quality
Picture Quality
In the evaluation of picture interference the wanted test signal
produces a standard picture and unwanted signal produces a
degradation of the picture.
The criterion of compliance with the requirement is just
perceptible degradation by observation of the picture. The
screen shall be observed under normal viewing conditions, at a
viewing distance of six times the height of the screen
produces a standard picture and unwanted signal produces a
degradation of the picture.
The criterion of compliance with the requirement is just
perceptible degradation by observation of the picture. The
screen shall be observed under normal viewing conditions, at a
viewing distance of six times the height of the screen
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