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CM 108AH Highly Integrated USB Audio I/O Controller www .cmedia.com.tw Copyright© C-Media Electro nics Inc. R ev . 2.1 ︱ P age 25/27 9.3 Mi crophone Input Frequ ency Response @ 4 8KHz Sample Rate Audio Prec isio n 09 / 2…

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CM108AH
Highly Integrated USB Audio I/O Controller
www.cmedia.com.tw
Copyright© C-Media Electronics Inc. Rev. 2.1︱ Page 24/27
9 Audio Quality Graphs
9.1 Line Out Frequency Response @ 48KHz Sample Rate (10K Ohm Loading)
Audio Precision 09/26/08 14:33:51
Vista-Frequency Response-M48k.at27
ColorSweep Trace Line Style Thick Data Axis Comment
1 1 Cyan Solid 1 Fasttest.Ch.1 Ampl!Normalize Left
1 2 Yellow Solid 1 Fasttest.Ch.2 Ampl!Normalize Left
-6
+1
-5
-4
-3
-2
-1
+0
-3.143
-0.01
d
B
r
A
20 20k50 100 200 500 1k 2k 5k 10k
19.998k
Hz
dx=-19.980 kHz
dy=-3.132 dB
9.2 Line Out THD+N @ 48KHz sample rate (10K Ohm Loading)
Audio Precision 09/26/08 14:27:07
Vista-D-A THD+N.at27
ColorSweep Trace Line Style Thick Data Axis Comm ent
1 1 Cyan Solid 2 Anlr.THD+N Ampl Left
1 2 Yellow Solid 2 Anlr.THD+N Ampl Left
-120
+0
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
d
B
r
A
20 20k50 100 200 500 1k 2k 5k 10k
Hz
CM108AH
Highly Integrated USB Audio I/O Controller
www.cmedia.com.tw
Copyright© C-Media Electronics Inc. Rev. 2.1︱ Page 25/27
9.3 Microphone Input Frequency Response @ 48KHz Sample Rate
Audio Precision 09/26/08 14:52:45 A-D FREQUENCY RESPONSE
Vista-A-D Frequency Response.at2c
ColorSweep Trace Line Style Thick Data Axis Comment Cursor1
1 1 Yellow Solid 1 DSP Anlr.Level A Left *-2.812 dBFS
1 2 Cyan Solid 1 DSP Anlr.Level B Left -2.812 dBFS
-3
-1
-2.8
-2.6
-2.4
-2.2
-2
-1.8
-1.6
-1.4
-1.2
-2.812
-1.423
d
B
F
S
20 20k50 100 200 500 1k 2k 5k 10k
20k20
Hz
dx=-19.980 kHz
dy=+1.389 dB
9.4 Microphone Input THD+N @ 48KHz Sample Rate
Audio Precision 09/26/08 14:51:13 A-D THD+N vs FREQUENCY
Vista-A-D THD+N.at2c
ColorSweep Trace Line Style Thick Data Axis Comm ent
1 1 Yellow Solid 1 DSP Anlr.THD+N Ampl A Left
1 2 Cyan Solid 1 DSP Anlr.THD+N Ampl B Left
-120
+0
-100
-80
-60
-40
-20
d
B
F
S
20 20k50 100 200 500 1k 2k 5k 10k
Hz
CM108AH
Highly Integrated USB Audio I/O Controller
www.cmedia.com.tw
Copyright© C-Media Electronics Inc. Rev. 2.1︱ Page 26/27
Reference
USB specification 1.1 and 2.0-compliant
USB audio device class specification 1.0-compliant
USB human interface device class specification 1.11-compliant