Audio recordings for mobile devices are predominantly mono-channel, in part, because stereo transducers are too large to be mounted on hand-held devices. By using array signal processing and omnidirectional, dipole cardioid elements, two-channel stereophony can simulate a stereo microphone. In addition, 5.1 surround sound can also be realized with a special microphone arrangement. To synthesize the desired beam patterns, optimized beamformers were designed with the aid of least-square and convex optimization techniques. Two-channel stereophonic recording configurations (including a broadside array and a curved array) and a 5.1 surround sound configuration were developed and evaluated with objective and subjective tests. For two-channel stereophonic recording, the results show that the broadside array and curved array outperform the conventional M-S technique. The 5.1 array has achieved similar recording quality as conventional systems.
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