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Hardware price drops very fast, except some company's AD cards ;-) ,now I found that E-MU Tracker Pre costs only US$149.95
(http://www.emu.com/products/product.asp?category=610&subcategory=611&product=17511), with excellent performance, for example:
1. Sample Rates: 44.1, 48, 88.2, 96, 176.4, 192kHz from internal crystal (no sample rate conversion)*
2. Bit Depth: 24-bit I/O, 32-bit processing
3. Frequency Response (min gain, 20Hz-20kHz): +0.0/-0.03dB
4. Dynamic Range (A-weighted, 1kHz, min gain): 112dB
5. Signal-to-Noise Ratio (A-weighted, min gain): 112dB
6. THD+N (1kHz at - 1dBFS, min gain): -102dB (.0007%)
7. EIN (20Hz-20kHz, 150ohm, unweighted): -127dBu
数年前,《Test & Measurement World》曾经对专业AD卡和一个普通声卡作过比较(参见:http://www.tmworld.com/article/CA187380.html)。该文比较了旧款16-bit , Creative Labs’ Sound Blaster AWE-32和NI公司的16-bit ADC National Instruments’ PCI MIO-16XE-10。 其结论是在对AD精度要求很高的THD测量中,两种卡的测试结果几乎完全相同。
声卡的缺点是:一般上不能测直流,做幅度的绝对测量时需要标定
[ 本帖最后由 TestGuru 于 2008-7-8 17:48 编辑 ] |
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