The Relationship Between Frequency and Sampling Rate

- Jul 20, 2018-

The sampling rate represents the number of times the original signal is sampled per second. The common audio file sampling rate is 44.1KHz. What does this mean? Suppose we have 2 sine wave signals, 20Hz and 20KHz, each of which is one second in length, corresponding to the lowest frequency and the highest frequency we can hear. We respectively sample 40KHz of these two signals, we can get What kind of result? The result is that the 20 Hz signal is sampled 40K/20 = 2000 times per vibration, while the 20K signal is only sampled twice per vibration. Obviously, at the same sampling rate, recording low frequency information is much more detailed than high frequency. This is also why some audiophiles accuse CDs of having digital sounds that are not real enough. The 44.1KHz sampling of CDs does not guarantee that high-frequency signals are better recorded. To record high-frequency signals better, it seems that a higher sampling rate is required, so some friends use a sampling rate of 48KHz when capturing CD tracks, which is not desirable! This actually has no benefit to the sound quality. For the tracking software, keeping the same sampling rate as the 44.1KHz provided by the CD is one of the guarantees of the best sound quality, instead of improving it. Higher sample rates are only useful when compared to analog signals. If the sampled signal is digital, do not try to increase the sample rate.



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