![]() ![]() Mostly, I use the chart when I tune my electronic kick drums which must have a correct pitch. In the following section I want to show you three applications of a frequency chart: Kick drum tuning What do we need such a chart for? Applications Consequently, a frequency chart tells you only the fundamental frequency of a certain pitch. The fundamental frequency of the sound is at 262 Hz. Let’s have a look at the spectrum analysis above. If you want to understand the advanced mathematics behind, I recommend the Wikipedia text about the Fourier transform (FT). The noise generator in any synthesizer would be an appropriate example. On the other hand, inharmonic partials make up for a noisy sound. A sound with harmonics appears clean and rich. If the frequencies of those partials are numerical integer multiples of the fundamental, they are called harmonics. Both together, fundamental frequency and overtones, are called partials. The deepest component of a tone is called fundamental frequency, while the components above it are known as overtones. Wait a minute?! Something must have gone wrong because there are many other frequencies within that sound, too…ĭon’t worry! Any sound is the sum of several frequencies. The Voxengo CurveEQ with a built-in spectrum analyzer And let’s analyze the sound which should be at 262 Hz… Now, let’s load a virtual piano into our DAW and let’s play a Middle C via the MIDI keyboard. Spectrum analysisĪ spectrum analyzer is a tool which shows you all the frequencies a sound contains. Let’s check this with the help of our DAW and its tools. For example, Middle C has a pitch of 262 Hz. Have a look at the chart in the picture above. It’s the 12th root of 2 which is 1,059.Ĭool! There we are! We have the magical number to calculate the frequency of any pitch. And, with that in mind, we can calculate the mathematical factor of a semitone. This means: It takes 12 semitones to get up an octave. What’s so special about this scale? It’s the distance between the pitches which is one semitone. all the 12 white and black keys on your keyboard). This is a scale which contains all available pitches (i.e. To calculate all the other pitches, we have to take a look at… The chromatic scale With that being said, it’s pretty easy to calculate all the A’s on your keyboard. So, the pitch of A4 on your MIDI keyboard is 880 Hz. If you jump up an octave, the frequency will be multiplied with the factor 2. Still, that leads to another question: What is the mathematical correlation between the different pitches on your keyboard? The answer to this question is pretty simple. ![]() This pitch (which corresponds to A3 on your MIDI keyboard) is also called concert pitch. The pitch of A above Middle C is tuned to 440 Hz. ![]() But how to find out the exact value? Lucky for us, in the 20th century some people decided to define a standard. According to this, a bass sound has a low frequency. This leads us to the following phenomenon: A sound with fast vibrations is perceived as a sound with a high frequency. It propagates as an audible wave of pressure.įrequency is a physical term that describes the number of vibrations per second. What is sound? Well, sound is defined as a vibration which propagates through the air or any other medium. To better understand this correlation, it’s important to have a look at some scientific terms first. Is there a correlation between a pitch and its frequency value? Yes, there is. Let’s start with an example: You hit a Middle C on your keyboard and wonder what frequency that might be. It is a table that contains the corresponding frequency for any pitch within the audible range (about 20 Hz to 20 kHz).īy the way: You can find the frequency chart above on my website. That’s when a frequency chart is a big help. More often than not you want to know the exact frequency of a certain pitch. A frequency chart I designed for my website
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