Within Comsol Multiphysics is the ability to create room acoustics simulations.  This can be extremely helpful in shaping the sonic picture of any space.  For example, when designing a classroom, if the room is large and has a lot of reflective surfaces, a high reverberation time and low clarity can cause students sitting in the back to have trouble understanding the speaker.  By using a simulation, you can test out many acoustic configurations of a room before anything is physically built, saving both time and money, and creating an auditory experience tailored to the needs of the space.

Users build out geometry of the room, adding in carpets, panels, and all other objects.  Next, users define absorption coefficients of all materials across frequency bands and map them to different surfaces in the room.  After this, the Sabine reverb equation can be calculated as a parametric sweep is simulated.
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The room being designed in this case is a room-within-a-room.  This will be useful for testing consumer devices in a setting that replicates actual use scenarios. After doing RT60 measurements in Soundcheck 19, it was decided corner bass traps would be a beneficial addition to the room.  In Comsol, multiple different bass traps were simulated in different positions to determine best material, placement, and volume to reduce sound reflections in low frequencies with minimal impact in high frequencies.   

By: Shannon McConnell

Whether you’re in a teleconference, a live music setting, or simply working in an office, noise and room reverberation time can affect your ability to pleasurably listen.  With our new Noise Files Comparison Tool, you can hear and easily compare different kinds of noise to aid in self diagnosing issues quickly and efficiently.  For example, you can toggle between 60Hz, Bluetooth, GSM, and Wi-Fi noise interferences to help find the source of unwanted sounds.  Also included are different types of broadband and background noise such as pink noise, white noise, city traffic, and a crowded pub.
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Additionally, recordings of the in-house Head and Torso Simulator (HATS) playing back an IEEE standard speech file were taken in an anechoic chamber, an acoustically treated room, and a highly reverberant non-acoustically treated room. These can be compared to highlight the impact partial and full acoustic treatment has on speech intelligibility.  

We can also use this tool to create custom recordings of your product in different noise conditions, tuning configurations, or other impairments- for subjective evaluation without a trip to our lab. For dB-accurate reproduction we ship you a DAC and Reference Headphones with Comparison Tool files corrected for both the headphone response and binaural HATS Head Related Transfer Function (HRTF).
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By: Shannon McConnell