Polar plots use two-dimensional polar coordinate system, where each point is determined by distance from a fixed point and angle from a fixed direction. X-axis in Polar charts becomes a circle, and the x-axis ticks remind of clocks. These charts can be used for drawing some mathematical functions; they support area, line, spline and scatter series and all axes supported by those series. Also Polar charts can imitate radars.
This Chart shows the comparison between sensitivity diagrams of different microphones with the same type of sensitivity. There are a lot of different sensitivity types, but in this chart we compare microphones of the unidirectional sensitivity type. It has three series; each series represents a microphone sensitivity diagram. All series are areas, colored differently from others. These series can be managed by clicking at the legend items; areas will be switched on/off on a click.
As usual, X-axis is a circle with ticks placed along the axis with an interval of 30 degrees. Its range is from 180 to 0 for one half of a circle and back to 180 on the other half, so it’s being emphasized that the sound source is in front of 0° point. You can notice that our y-axis holds values in a range from -25 to 0 dB.
From this Chart we can see that the light blue area that represents the SMM58 microphone has the best sensitivity, being almost omnidirectional, and the brown-colored series shows the smallest sensitivity.