Hi Expert,
I am debuging TLV320AIC3254 in sport DV,but after I tested the performance of TLV320AIC3254,I find the S/N value is distorted.
Could you help to check it and give some suggestions?
Thanks a lot.
The test report is as follows.
| Test Project |
■【Audio Test】 |
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| instrumentation： Audio Precision,loudspeaker box | |||||||||||||
| Test condition：Environmental noise＜30DB ，1KHZ,0DB sound source, the distance between sound source and product is 20cm，auido test software ：AP2007.3.30 |
| Test item | Specifications and standards | The test results | determine | |||||||||
| 1# | ||||||||||||
| 1. Sensitivity |
1.Make the horizontal distance between loudspeaker box and the Mic of DVT 30cm. 2.Play 1KHz/0dB sound source with loudspeaker box,adjustment output SPL and make it 72dBrA when 30cm far from the loudspeaker box.DVT REC the sound at the same time. 3.Connect DVT to Audio Precision 2722，and playback the video that recorded before. 4.Run the firmware of Audio Precision 2722 on PC，then we can get the output SPL. Sensitivity =20lg[Output Voltage(mV)/Input Voltage(mV)] =Output SPL(dB)-input SPL(dB) Criterion of Sensitivity:≥50dB(安霸)，≥48dB(联咏) |
50.606dB | OK | |||||||||
| 2. THD+N ratio |
1.Make the horizontal distance between loudspeaker box and the Mic of DVT 30cm. 2.Play 1KHz/0dB sound source with loudspeaker box,adjustment output SPL and make it 72dBrA when 30cm far from the loudspeaker box.DVT REC the sound at the same time. 3.Connect DVT to Audio Precision 2722，and playback the video that recorded before. 4.Run the firmware of Audio Precision 2722 on PC，then we can get the info of THD+N. Criterion of THD+N:＜5%(安霸)，＜7%(联咏) |
4.68% | OK | |||||||||
| 3. S/N (录音信噪比) |
1.Make the horizontal distance between loudspeaker box and the Mic of DVT 30cm. 2.Play 1KHz/0dB sound source with loudspeaker box,adjustment output SPL and make it 72dBrA when 30cm far from the loudspeaker box.DVT REC the sound at the same time. 3.Connect DVT to Audio Precision 2722，and playback the video that recorded before. • Run the firmware of Audio Precision 2722 on PC，and push F4 button when the 1KHz being playbacked.Then we can get the info of SNR Criterion of S/N:≤-30dB(安霸/联咏) |
-26.641dB | NG | |||||||||
Test Pictures:
