Directional microphone integrated into device case

A case for use with a portable electronic device having a microphone coupled to space outside the electronic device through a device opening,

• the case comprising:
• a first enclosed, elongated space extending within the case from a first case opening in an interior surface of the case along a first side of the case,
• the first case opening corresponding to the location of the device opening when the electronic device is located in the case,
• the first enclosed, elongated space being tapered to an increasingly smaller cross-section as it extends away from the first case opening, and
• a first edge of the first elongated space aligning along most of its length with an exterior surface of the case;
• a second case opening in the exterior surface of the case along the first edge of the first elongated space;
• a screen covering the second case opening along the length of the first elongated space, the screen providing an acoustic resistance between the first elongated space and air outside the case through the second case opening;
• a gasket located at the first case opening for coupling the first elongated space to the microphone of the electronic device through the device opening;
• a second enclosed, elongated space extending within the case,
• the second enclosed, elongated space being tapered to an increasingly smaller cross-section as it extends away from a first end of the second enclosed, elongated space,
• the total length of the second elongated space being the same as the total length of the first elongated space,
• the second enclosed, elongated space being on a second side of the case opposite the first side of the case, and
• a first edge of the second elongated space aligning along most of its length with the second exterior surface of the case;
• a fourth case opening in the second exterior surface of the case along the first edge of the second elongated space;
• and
• a second screen covering the fourth case opening along the length of the second elongated space, the second screen providing an acoustic resistance between the second elongated space and air outside the case through the fourth case opening.