A broadside small array microphone beamforming unit comprises a first omni-directional microphone to generate a signal X1(t), a second omni-directional microphone to generate a signal X2(t), a first delay unit delaying the signal X1(t) to generate a signal X1(t−T), a second delay unit delaying the signal X2(t) to generate a signal X2(t−T), a first substrator subtracting the signal X1(t−T) from the signal X2(t) to generate a signal R(t)=X2(t)−X1(t−T), a second substrator subtracting the signal X2(t−T) from the signal X1(t) to generate a signal L(t)=X1(t)−X2(t−T), a third delay unit delaying the signal R(t) to generate a signal R′(t)=R(t−D), a gain function unit convoluting the signal L(t) with a gain function G(t) to generate a signal L′(t)=L(t)*G(t−i), and a substrator subtracting the signal L′(t) from the signal R′(t) to generate a signal B′(t)=R′(t)−L′(t).