Active Noise Cancelling for Radio

The core of noise cancellation technology for our radios is a mechanism that analyzes signals on a DSP chip, using a front microphone for voice and a rear microphone for noise. The DSP chip separates voice and noise in the frequency domain and generates a signal that cancels only the noise component. This technology enables the extraction of clear voices even in noisy environments, achieving a noise reduction effect up to 20-30dB. In addition, ingenuity has been applied to suppress artificial digital noise while preserving the naturalness of the voice.

Specialized noise, such as sirens and PASS alarms frequently encountered at fire and ambulance sites, has been difficult to eliminate with conventional technology. Our technology automatically identifies and powerfully suppresses these sounds through spectral analysis. In particular, even for noise in the frequency band that overlaps with voice, high-precision detection and removal are possible based on a characteristic frequency distribution. As a result, voice is transmitted clearly even in emergency situations, improving the safety and efficiency of operations.

With the automatic function that adjusts the intensity of noise cancellation based on the presence or type of noise, our system reduces the effect of processing in quiet environments to prevent degradation of sound quality. It also features comprehensive customization functions, allowing users to fine-tune settings such as noise suppression levels and microphone sensitivity according to their usage environment. These functions enable optimal voice communication in various settings, from construction sites to medical facilities.