Artificial intelligence (AI) speaker made of bio-inspired piezoelectric MEMS directional microphone for voice differentiation in a directional range of 0°-360°

Bio-inspired directional microphone (BDM) is the talk of the town regarding its better noise and subwavelength directivity performance as compared to conventional directional microphone. This paper reports on a novel application, i.e., the AI speaker using an array of three BDMs. Each BDM is placed in 120 interval; as a result, each diaphragm becomes prominent in each 60° of incidence of sound. Moreover, backside of all BDMs is open to imitate the directivity in cosine-dependency. The sensing signal of BDMs relative to the incoming sound is processed using in-house amplification circuit made of commercially available IC-AD22057. Then, an 8(Ω) speaker is added to reconstruct the sensing signal followed by a digital logic. An Arduino-based logic is adopted to select the maximum sensing out of all diaphragms followed by the cosine-dependency. The full package including BDMs, in-house circuit, digital logic, and speaker is experimentally tested in an anechoic chamber. The attained results verify the novelty of the developed device. The device is further displayed using two different music by placing at different angles and having different pressure level. The results are convincing to be incorporating in some AI based cutting-edge acoustic applications like robotic hearing-system