The 0400 Series
The 0400 Series
Analog and PDM MEMS Directional Microphone
The 0400 series are directional MEMS microphones with a dipole pickup pattern for acoustic background noise rejection and superior sound isolation. The highly directional polar pattern exists across the audbile signal range for a full, high-fidelity sound. This directionality allows for clear pickup of the desired signal with minimal signal processing even in noisy environments.
The 0400 series is available in both Analog and Digital.
Specifications
Directionality Pattern | Dipole |
|---|---|
Directivity Index | 4.8 dB |
SNR | 63.5 dBA |
AOP | 134 dB SPL |
Current Consumption | 115 µA |
Package | 3.50 x 2.65 x 1.31 mm3 |
Output | Single-Ended or Differential |
Product Benefits
Superior background noise rejection | |
|---|---|
Two microphones can be paired to enable full 360º beam steering and sound localization | |
High dynamic range | |
Can replace traditional omnidirectional arrays | |
Applications
Boom Headsets | Speakerphones |
|---|---|
Webcams | Gooseneck Microphones |
AR Glasses | OTC Hearing Aids |
VR Headsets | Wireless Headsets |
Our Unique MEMS Design
Consistent Directionality
The 0400 series of microphones provides incredibly consistent directionality from 20Hz – 20kHz, something that can be very difficult with traditional omnidirectional arrays.
Small Footprint
By bringing the power of omnidirectional microphone arrays into a single microphone, the 0400 series reduces the real estate and power consumption needed in end devices.
Directional SNR
Where omnidirectional microphone arrays must sacrifice SNR to obtain directionality, the 0400 series gives the best of both worlds. Built from the hardware up to be naturally directive, there is no added cost to the SNR.
Software Compatible
Pairs of 0400 series microphones can be used in conjunction with software to enable a variety of features – beamforming, voice tracking, stereo recording, and more!
An omnidirectional microphone listens to every direction equally, providing uniform sound sensitivity. Omnidirectional microphones require the use of multiple microphones and software to provide directionality. A directional microphone is built to be directional, with natural noise rejection from off-axis sources. Using both microphones together can be a powerful combination to maximize flexibility. To learn more about combining directional and omnidirectional microphones check out this article on combining microphone polar patterns.
Our microphones are inherently directional. They provide directionality in the hardware alone, without any need for software. However, we have also built expertise in algorithms to further enhance the performance and features of our microphone. To learn more, check out our software page.
Each application has different needs. A dipole brings the most rejection on the sides, while cardioids favor noise rejection in the back. Check out these demo videos to learn more!
With a distance factor of almost 1.75, a dipole microphone can listen ~75% farther than an omnidirectional microphone of similar SNR.
Directional microphones have two sound ports, one in the front and one in the back. It is not always obvious how to design the acoustic ports in a product. There are many ways to bring the acoustic ports of the microphone to different surfaces in a product. Our app note AN300 helps illustrate some of the most common methods we see.
No, all directional microphones have a non-flat frequency response. When we calculate the SNR, we take this into account by looking at the signal-to-noise ratio at each individual frequency, integrated across the audible spectrum. This is equivalent to taking the SNR post-equalization of the microphone.
Application Notes
Attributes of Directional MEMS Microphones
AN-110 walks through key attributes of Soundskrit’s directional microphones such as directionality, SNR, acoustic path length, and more.
Creating Different Polar Patterns in Beamforming
AN-220 examines how omnidirectional and dipole microphones can be combined using beamforming to create variable polar patterns.
Integration Guide for Directional MEMS Microphones
AN-300 introduces the key integration considerations of Soundskrit’s directional MEMS microphones and builds intuition on using these microphones in products.
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