Unidirectional microphone

A unidirectional microphone including a microphone unit which is of generally cylindrical shape, the microphone unit being mounted in a microphone unit containing portion and having a top surface, a bottom surface, and a side surface, a baffle plate disposed about the side of the microphone unit at one end, a housing having an opening surface larger than the baffle plate, the opening surface being substantially parallel to the top surface of said housing, a microphone unit-containing portion extending from said opening surface of the housing to a housing bottom for containing said microphone unit with said baffle plate, a front acoustic terminal at the top surface of said microphone unit, a rear acoustic terminal at the bottom surface of said microphone unit, a side acoustic terminal connected to the rear acoustic terminal, and baffle plate at the first opening surface of the housing, said unidirectional microphone further including:

• said microphone unit being positioned substantially at the center of said baffle plate;
• said opening surface extending in the width direction with respect to its center and forming a pair of gaps between said baffle plate and said microphone unit containing portion at both ends thereof;
• and
• a pair of passageways formed between the bottom of said microphone unit containing portion and said gap so that said rear acoustic terminal communicates with said side acoustic terminals.

A unidirectional microphone including a microphone unit which is of generally cylindrical shape, the microphone unit being mounted in a microphone unit containing portion and having a top surface, a bottom surface, and a side surface, a baffle plate disposed about the side of the microphone unit at its top end, a housing having an opening surface larger than the baffle plate, the opening surface being substantially parallel to the top surface of said housing, said microphone unit-containing portion extending from said opening surface of the housing to a housing bottom for containing said microphone, a front acoustic terminal at the top surface of said microphone unit, a rear acoustic terminal at the bottom surface of said microphone unit, a side acoustic terminal connected with the rear acoustic terminal, and said baffle plate at the opening of the housing, said unidirectional microphone further including:

• said microphone unit being positioned on either side of said baffle plate;
• said opening surface being longer;
• said baffle plate so as to form a gap between said baffler plate and said microphone unit containing portion located at either side thereof;
• said side acoustic terminal which comprises said gap;
• and
• a passageway formed between the bottom of said unit fitting portion and said gap so that said rear acoustic terminal communicates with said side acoustic terminal.

A unidirectional microphone including a microphone unit having a top surface, a bottom surface, and a side surface;

• a front acoustic terminal provided on the top surface of said microphone unit;
• a rear acoustic terminal provided on the bottom surface of said microphone unit;
• a baffle plate provided on a top end portion of the side surface of said microphone unit;
• an opening surface formed on a flat-faced plate, whose height is at same level as the top surface of said microphone unit;
• said flat-faced plate being formed by a display panel for a computer and said unidirectional microphone comprises at least one or more microphones provided on the flat-faced plate;
• a unit fitting portion for fitting said microphone unit therein, the unit fitting portion having a bottom surface and a slope formed from said opening surface toward the bottom surface;
• and
• a side acoustic terminal provided in said unit fitting portion for communicating a sound pressure to the rear acoustic terminal.