by Antimatter Research

A cleaner sounding microphone for your typical webcam that allows for better speech-recognition and teleconference, is hackable, and based on a chipset that is capable of being Alexa

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of $6,900 goal

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Product Choices



ONE Acusis unit, fully assembled, tested, and ready for you to use. Includes one 6' microUSB cable verified to work with Acusis.


Ultra Acusis (2 pack)

This one's ready to share, or if you just like having an extra. TWO Acusis units, fully assembled, tested, and ready for you to use. Includes two 6' microUSB cable verified to work with Acusis.


Mega Acusis (5 pack)

This one is for you, your friends, and your pet; or if you just like having few extras. FIVE Acusis units, fully assembled, tested, and ready for you to use. Includes five 6' microUSB cable verified to work with Acusis.


Recent Updates

As Featured In

Hackster News

"The Acusis is built around the XMOS XVF3000 voice processor, a single chip solution that supports up to four PDM microphones, USB and audio output, as well as on-board DSPs for beamforming and echo cancellation."

Geeky Gadgets

"Acusis microphone enables improved speech-recognition and teleconference"


“Needed a conference mic for a large room. Didn’t want to spend much at all. Tried other cheap mics, got terrible results.

$300 Mic? No budget. $80? Sure!"

“A quality far-field microphone with beamforming and effective acoustic echo cancellation. Acusis is by far the best microphone I’ve tested with these capabilities.”

“It needed to hear everybody in the room, even ones a bit far away. It should adjust the gain for them automatically. This was accomplished well.
It even has some visible LEDs showing that it is picking up a conversation from a participant in the meeting from a certain location in the room. I didn’t even know it had that! It means people know when they are being heard or not and can adjust their tone and volume to be loud and clear. BONUS!
This did all that."

"Im using it outdoors. Linear array in combination with binaural ear mic/phones. Only the mics on my ears are for cancellation and the array is for far field pickup. Telephoto camera camera in middle of mic with display on reverse aide. Its like a set of audio binoculars. Birds sound as if they are right in front of me. Or as i like to say, im up in the trees with the birds."


Acusis Echo-cancellation featuring Raspberry Pi
Acusis and Alexa with Raspberry Pi
Bil Herd talks about Acusis
What-if ASMR with Acusis
Factory Test Instructions in Mandarin

What is Acusis?

Acusis is a simple-to-use, complete solution for improving the audio quality of your speech-recognition or video communications project.

It solves two common issues, all in a single device that hooks up to your project with standard USB protocols.

  1. Far-field reception: Acusis is designed to hear someone speak in a

conversational voice from across the room.
2. Echo cancellation: Acusis is designed to remove the "echos" of the sound your device is producing from what gets picked up by your microphone.

Also, Acusis is a linear array rather than circular, which makes it great for mounting on a monitor or TV.

If you’re building a project using a microphone today, or you just want better audio for your video chats or podcasts, Acusis is a great solution.

Why Acusis?

Acusis solves two really important problems for anyone building an audio/speech project:

Far-Field Reception

Acusis is designed to capture normal speaking volume from across a room, due to its advanced beam-forming microphone array. The microphones form a "phased-array", working together to listen in the direction of the speaker. You may notice that the microphones are placed with varying spacing, that’s to help with beamforming. The spacing between a microphone pair is best for one frequency, so having different spacing helps cover more frequencies. Learn more about beamforming.

Echo Cancellation

Acusis is designed to remove the "echos" of the sound your device is producing from what get picked up by the microphone, significantly reducing feedback in the case of voice/video conferencing, and keeping your speech recognizer from hearing the audio you are creating. All you have to do is make sure your audio output is passed through Acusis and it will make sure it doesn’t feed that audio back to you.

Putting It Together

You attach Acusis to your computer/Raspberry Pi/custom system via USB. It will connect to your device as a USB microphone and a USB speaker. The reason it appears as a speaker is because to remove echos from the microphone input, it needs to receive the audio you are producing.

You can get audio to it two ways. One is to send audio to it as your primary audio output and connect your external speaker to Acusis’ line-level audio output. In this mode all of the sound is passed through to your speaker.

If you can’t put Acusis between your device and your speaker, you can usually configure your device to output audio to two devices at the same time, one output being Acusis, the other being the speakers you want to use.

On a Mac, you do this with "Audio MIDI Setup", and it’s pretty straight-forward. Other platforms have either built-in or third-party solutions (we’ll post solutions on our site).

We built Acusis to be attached to the front of a webcam; that’s why it has a circular opening in the center. Just use some double-sided tape and you’re good to go. At some point in time, we may introduce velcro attachments, stay tuned!

Acusis is built on a really cool component, the XMOS XVF3000. The XMOS is a single chip that lets us hook up four PDM microphones, USB, and audio output. Internally, it has an array of DSPs for running algorithms for beamforming and echo cancellation.

You can use Acusis out-of-the-box as a really good microphone. You can also hack on it yourself by downloading the SDK from XMOS, writing your own code, and using and XTAG programmer.

The audio processing is monophonic-only, which is fine for most applications of video conferencing or speech recognition. A stereo version may come later.

We designed the board to work without an enclosure to maximize the quality of microphone reception. There are mounting holes available if you decide to make an enclosure yourself.

Quick Installation

Use Cases

Podcast App

Awhile back we built a voice-controlled application that ran on a Chrome browser in Linux and played podcasts. Our normal microphone picked up the podcast audio and fed it back into the speech recognition engine, which was pretty annoying since it filled up our logs with transcriptions of the podcasts. With Acusis, only our voices are heard, since the podcast audio output is cancelled by the XMOS DSP.

Video Chat

We’ve attached Acusis to our wall-mounted video chat system to make our audio communication better. We no longer need to yell at the microphone — Acusis hears quite well from across the room.

Hack and Learn

Grab a Logitech camera and/or an XTAG programmer accessory with Acusis and start building your projects now.

How to Hack

Unzip this file below for the latest release. Full release notes and install instructions are included in the zip, which will give you a start:

See our forum for further help on building your own image:

Good luck!

Features & Specifications

  • Power: USB Powered, < 1 W
  • Microphones: 4 PDM mics in linear array, adaptive beam-former
  • Chipset: XMOS XVF3000
  • AGC (Automatic Gain Control): Yes
  • Echo Cancellation: Full-Duplex, Barge-in Support, up to 50 dB attenuation
  • Noise Suppression: Up to 15 dB attenuation
  • Audio In: USB, appears to host as a speaker
  • Audio Out: 3.5 mm mono jack
  • Dimensions: 210 mm x 40 mm x 18 mm
  • Weight: 34 g


Re-Speaker Mic ArrayWebcam MicAcusis
Far-field MicrophoneYesNoYes
Automatic Echo CancellationNoNoYes
TV/Monitor MountNoYesYes
LED IndicatorsNoNoYes
Audio PassthroughNoNoYes
Designed to Fit Over a WebcamNoNoYes

We hope you enjoy using Acusis as much as we enjoyed making it!


Antimatter Research

We like to think of ourselves as a true full-stack company. We have a variety of skills ranging from chip design to PCBs to firmware, OS, applications, cloud, computer vision, and machine learning. We've worked with a variety of companies and contract manufacturers and can help with a project from inception to production.

Gladys Wong

Jim Baldwin

Peter Macdonald

Kevin Meier

Hedley Davis

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