It’s usually the distance from a 1/8 inch (3.75 mm) to approximately 12 microseconds (1 ms).
The difference between 20 microseconds and the “microsecond” in English is 3.2 millionths of a second, or a little under a millionth of a second.
In this particular audio example, the frequency is 44.1 kHz and the sample rate is 48 kHz. This is a very low-frequency signal, but it’s also very short. If we divide the time difference between the two by the rate, we arrive at a time value of about 0.000013 milliseconds (a microsecond).
Now let’s look at the frequency of 10 ms: 44.1 kHz – 24.04 kHz, or 0.016375 MHz; and 24.04 kHz – 10.03 mhz, or 0.020175 MHz. If we divide the frequencies by the rate, we arrive at a difference of 0.1 second, or 20 microseconds. The frequency is very low, but we’re still talking about a very quick signal and we can easily notice a noticeable difference.
You’ve seen that the frequency, the sample rate, and the speed or distance are all related. We’ve covered the first two topics in a lot of detail in this article, so we’ll stick to the latter one.
How are we going to divide the time in milliseconds? Let’s start with the sample rate, or the rate in Hertz, which is 1 Hz. The time of one millisecond will be 1/10^12th of a second, or 0.11306046. The sample rate of 1 Hz is much faster than the rate of 1 Hz in audio. Thus, the interval is 0.000012 times as fast as the sample rate.
When dividing the interval by the rate, we arrive at a “percentage” to divide by:
1) 0.1/10^12ths (1 ms) divided by 0.0012= 0.000012= 0%
2) 0.0012ms divided by 0.000013= 0.000103= 8.6%
3) 0.000103ms divided by 0.000130= 9.7%
4) 0.000103ms divided by 0.00020000= 22.2%
5) 0.00020000ms divided by 0.00050000
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