Beamforming method and microphone system in boomless headset

A microphone system applicable to a boomless headset with two earcups, comprising:

• a microphone array comprising Q microphones that detect sound and generate Q audio signals, wherein a first microphone and a second microphone of the Q microphones are disposed on different earcups, wherein a third microphone of the Q microphones is disposed on one of the two earcups and displaced laterally and vertically from one of the first and the second microphones;
• and
• a processing unit configured to perform a set of operations comprising:
• performing spatial filtering over the Q audio signals using a trained model based on an arc line with a vertical distance and a horizontal distance from a first midpoint of the first and the second microphones, a main time delay range for the first and the second microphones and coordinates of the Q microphones to generate a beamformed output signal originated from zero or more target sound sources inside a target beam area (TBA), where Q>=3;
• wherein the TBA is a collection of intersection planes of multiple surfaces and multiple cones;
• wherein the multiple surfaces correspond to multiple main time delays within the main time delay range, and angles of the multiple cones are related to multiple intersection points of the multiple surfaces and the arc line;
• and
• wherein the multiple surfaces extend from the first midpoint, and the multiple cones extend from a second midpoint between the third microphone and the one of the first and the second microphones.