Microphone system, sound input apparatus and method for manufacturing the same

A microphone system, comprising:

• a housing, adapted to be placed in a reference position relative to a sound source;
• a first microphone, configured to receive sound from the sound source at a first position within the housing, and generate a first voltage signal in accordance with the sound received at the first position;
• a second microphone, configured to receive sound from the sound source at a second position within the housing, and generate a second voltage signal in accordance with the sound received at the second position;
• and
• a differential signal generator, configured to receive the first voltage signal and the second voltage signal, and generate a differential signal indicative of a difference between the first voltage signal and the second voltage signal, wherein:
• the first and second positions are arranged on a first line;
• and
• the first line perpendicularly intersects a second line that is extended from the sound source at a third position which is not between the first and second positions, and obliquely intersects a third line that is extended from the sound source at a fourth position which is between the first and second positions, when the housing is placed at the reference position.