窗函数带宽计算器
使用此窗函数带宽计算器快速获得准确的计算结果。
Minimum 2 (Nyquist), typical 4-8 for practical systems
Minimum Sampling Rate (Nyquist)
40,000 Hz
Minimum Sampling Rate (Nyquist) vs Maximum Signal Frequency
公式
How to Determine Sampling Rate
The Nyquist theorem states the minimum sampling rate is twice the highest signal frequency.
Formulas
f_sample_min = 2 x f_max
f_sample_practical = Oversampling Ratio x f_max
In practice, engineers oversample (4x to 8x or more) because:
计算示例
Capture audio up to 20 kHz with 2x oversampling.
- 01Minimum (Nyquist): 2 x 20,000 = 40,000 Hz
- 02Practical rate: 2 x 20,000 = 40,000 Hz
- 03Data rate (16-bit): 40,000 x 16 = 640,000 bits/s = 640 kbps
常见问题
Why not just sample as fast as possible?
Higher sampling rates require more storage, bandwidth, and processing power. Choose a rate that balances quality and resources.
What oversampling ratio should I use?
For basic measurement: 2.5-3x. For precision: 4-8x. For sigma-delta converters: 64-256x.
Does higher sampling rate mean better quality?
Only if there is signal content above the current Nyquist frequency. For signals already band-limited, more resolution (bits) helps more than more speed.
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