A polar pattern is a circular graph that shows how sensitive a microphone is in different directions. Each “circular” division represents 5dB of sensitivity, so you can see where the microphone picks up the strongest to the weakest sounds at different points. On the graph below, 0 degrees shows the direction the microphone is facing. 90 and 270 degrees are the sides of the microphone and 180 de...

In this paper, we introduce a noise robust speech recognition system for a voice-driven wheelchair. Our system has adopted a microphone array system in order for the user not to need to wear a microphone. By mounting the microphone array system on the wheelchair, our system can easily distinguish the user’s utterances from other voices without using a speaker identification technique. We have a...

Multi-microphone speech enhancement methods typically require a reference position with respect to which the target signal is estimated. Often, this arbitrarily chosen as one of microphones. However, it has been shown that choice microphone can have significant impact on final noise reduction performance. In paper, we therefore theoretically analyze selecting performance near-end being taken in...