A/V Technical Test & Demonstrations
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Why these Tests?
Test YT A/V converter and player programs, and system components.
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WARNING: SOME TESTS CONTAINS HIGH LEVELS OF HIGH FREQUENCIES, OR SQUARE-WAVES AND MUST NOT BE PLAYED AT HIGH VOLUMES IF LOUDSPEAKERS DAMAGE IS TO BE AVOIDED. These videos/tests are private (for caution). They can be used only by a contact list of YT users. To use it, send me a message [
http://www.youtube.com/outbox?to_user=pjoef ], so I can send you a friend invite. If you accept, I can add you to "A/V TEST" contact list, and finally, you will be able to play all tests.
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Some "tips" to use these Tests: First, follow the instructions in the description of the video before use. Make test, listening and viewing at a quiet moment of the day and with the appropriate light. The defects of differences put in evidence by some tests are sometimes very subtile and can be hidden by ambient noise wich disturbe our auditive system. Make the tests after your electronic equipments has worked for about 10 minutes (to get the working temperature). Note the result. Make these tests again regularly (every 3 months for instance). Note results and compare with those already noted down.
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Maximum Cutting Level
00:39 1KHz 0dB L+R
0:20 ______________________________
Left/Righ Location and Channel Separation
01:19 [1] 1KHz 0dB Left
0:20 [2] 1KHz 0dB Right
0:20 ______________________________
Frequency Response
02:29 WARNING THIS TEST COULD BE USED BY REGISTERED USER ONLY!
[1] 20Hz/20KHz 0dB L+R
1:00 [2] 20Hz/20KHz -20dB L+R
1:00 ______________________________
Harmonic Distortion
05:08 WARNING THIS TEST COULD BE USED BY REGISTERED USER ONLY!
[1] 1KHz 0dB L+R
0:10 [2] 20Hz 0dB L+R
0:20 [3] 50Hz 0dB L+R
0:20 [4] 100Hz 0dB L+R
0:20 [5] 200Hz 0dB L+R
0:20 [6] 500Hz 0dB L+R
0:20 [7] 1KHz 0dB L+R
0:20 [8] 2KHz 0dB L+R
0:20 [9] 5KHz 0dB L+R
0:20 [10] 10KHz 0dB L+R
0:20 [11] 12KHz 0dB L+R
0:20 [12] 15KHz 0dB L+R
0:20 [13] 18KHz 0dB L+R
0:20 [14] 20KHz 0dB L+R
0:20 [15] 1KHz 0dB L+R
0:10 ______________________________
Signal~to~Noise Ratio
00:48 [1] Zero Digital Level "Infinite Zero" emphasis off
0:20 [2] Zero Digital Level "Infinite Zero" emphasis on
0:20 ______________________________
Transient Signal Response
01:40 WARNING THIS TEST COULD BE USED BY REGISTERED USER ONLY!
[1] Square Waves -6dB 400Hz
0:20 [2] Square Waves -6dB 1KHz
0:20 [3] Tonebursts -6dB 400Hz
0:20 [4] Tonebursts -6dB 4KHz
0:20 ______________________________
Intermodulation by Crosstalk
00:49 [1] 1KHz Left, 5KHz Right, 0dB
0:20 [2] 5KHz Left, 1KHz Right, 0dB
0:20 ______________________________
Intermodulation Distortion
01:25 WARNING THIS TEST COULD BE USED BY REGISTERED USER ONLY!
[1] 50Hz + 7KHz L+R
0:20 [2] 400Hz + 7KHz L+R
0:20 [3] 19KHz/20KHz L+R
0:20 ______________________________
D/A Converter Overload Effect
02:07 [1] 1KHz 0dB, L+R
0:20 [2] 1KHz +3dB, L+R
0:20 [3] 1KHz +6dB, L+R
0:20 [4] Music at Nominal Level
0:28 [5] Music with a 9dB Overload
0:28 ______________________________
Audible Differences in Quantization
00:56 [1] 16 bits Encoded Music
0:28 [2] 8 bits Encoded Music
0:28 ______________________________
Audible Differences in MPEG Audio Quality
01:53 [1] MPEG Layer II 48KHz 384Kbps Music
0:28 [2] MPEG Layer II 48KHz 256Kbps Music
0:28 [3] MPEG Layer II 48KHz 128Kbps Music
0:28 [4] MPEG Layer II 48KHz 64Kbps Music
0:28 ______________________________
1. AVI: 720x480 16:9 1.2 29.97 3.6 MB/s
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2. WMV: 720x480 16:9 1.185 0.236 MB/s
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3. MPEG: 400x228 16:9 1.2 0.277 MB/s
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