Polar plot
The smart speaker is a quickly growing business in the current market of consumer electronic products in recent years. Most ID designs have a cylinder with a down-firing speaker that tries to radiate and spread sounds evenly in a 360-degree spatial effect to satisfy single or multiple users who will move around in the home. The array microphones with a proper algorithm are the same concept for receiving sound from users. The geometry of the diffuser and the distance between a diffuser and the speaker's diaphragm will influence how the sounds spread out and radiate in the environment.
![](upload/xheditor/4_1.png)
Applying COMSOL Multiphysics (a Finite Element Analysis tool) to build a simulation model, we then predict the Polar Plot of the spreading sound, guided by an optimized diffuser in front of the speaker.
![](upload/xheditor/4_2.png)
Generating the speaker in rated power selects a frequency to see the Sound Pressure Level spread out and radiate in the environment.
![](upload/xheditor/4_3.png)
Select the surrounding axis and the frequencies to analyze the Polar Plot.
![](upload/xheditor/4_4.png)
To analyze another surrounding axis.
![](upload/xheditor/4_5.png)
Kingstate can suggest effective solutions to increase the sound pressure level if a specific frequency needs improvement. All improvements can be verified before making actual samples by y bbuilding simulation models to compare the performance of original and improved diffusers.
![](upload/xheditor/4_6.png)
In this case, our customer wants to increase the loudness to 6 KHz; the simulation results confirm that the improvement works.