Click a below Icon for demos about Noise Reduction with one microphone or two microphones:

Sound samples of Acoustic Echo Cancelling are available for Mobile and Automotive use cases:

Dual-Microphone Array-Technology works with microphones front and rear in the top of a phone, or two microphones side by side with Frontal Focus:

In Automotive use cases Dual-Microphone Array-Technology with Lateral Focus is very effective: