A Hybrid VOX System Using Emulated Hardware Behaviors
This paper analyzes two well-known but complementary speech detection algorithms, and combines them to create a robust, low complexity method of speech detection. Software emulation of behaviors important in venerable hardware-based voice-operated switches is key to hybrid system performance. The authors test the hybrid system in the context of amateur radio, where speech and in-band data is accurately detected in real-time, even in the presence of significant noise. Speech detection plays an important role in applications where communication may be intermittent, or hands-free operation is desirable. Examples of this class of applications include emergency radio services, amateur radio, and communications for infrastructure maintenance and development.