A Mic Array That Actually Fits Into Your Designs

Interacting with computers through natural spoken language — just as we would with another person — has long been a dream of techies. This idea has been explored in countless works of science fiction over the years, perhaps most famously in Star Trek. Today, this dream has nearly been realized. Thanks to advances in AI, especially large language models, we can verbally communicate with computers, and agentic systems can even take control of these machines to fulfill complex requests.

However, you need to have some decent hardware in place for a good experience with a voice assistant. Good microphones, in particular, are essential. Without clear audio to work with, these systems go haywire — and I don’t remember a computer ever telling Captain Kirk “I’m not sure how to help you with that.”

The new reSpeaker Flex from Seeed Studio was designed for cases like this. It is equipped with an array of four high-quality microphones and was built specifically to pick up voices with clarity. Priced at just under $50, the reSpeaker Flex is suitable for everything from robots and smart terminals to interactive devices embedded in everyday environments.

At the core of the system is the XMOS XVF3800 voice processor, which enables a suite of advanced on-device audio processing features. These include acoustic echo cancellation for full-duplex communication, noise suppression to filter out background and mechanical sounds, and de-reverberation to reduce echo in enclosed spaces. Together, these capabilities ensure that voice input remains clear and intelligible, even in noisy or dynamic environments.

The device also incorporates multi-beamforming technology, allowing it to focus on a speaker’s voice while minimizing surrounding noise. Complementing this is direction-of-arrival detection, which can determine where a sound is coming from in real time. In robotics applications, this means a machine can not only hear a command, but also turn toward the person speaking, creating a more natural and responsive interaction.

The microphone array is physically separated from the main processing board and connected via a flexible cable. This allows developers to position the microphones closer to the user — such as on a robot’s head or the edge of a display — while keeping the processing hardware neatly tucked away inside the device.

To accommodate different use cases, the reSpeaker Flex supports both circular and linear microphone array configurations. The circular version offers 360-degree voice pickup and is well-suited for robots or open environments, while the linear version provides a 180-degree front-facing field ideal for kiosks and digital signage.

The system can reliably detect wake words from distances of up to five meters, with some scenarios extending even further thanks to beamforming enhancements. This makes it viable for large rooms, public installations, and multi-user environments where proximity can’t be guaranteed.

Designed with developers in mind, the reSpeaker Flex offers plug-and-play USB connectivity for platforms like Raspberry Pi and NVIDIA Jetson, along with I2S support for microcontrollers. Its compatibility with ecosystems such as Home Assistant and ESPHome further streamlines integration into smart home and IoT projects. You can pick one up today directly from Seeed Studio.