Hands-free speech communication device for an emergency call system

A hands-free speech communication device for an emergency call system, the hands-free speech communication device comprising:

• a housing disposed in a vehicle cabin;
• a speaker which is housed in the housing and outputs from a first surface of the housing a reception sound of a communication party;
• a microphone which is housed in the housing and collects sound from the first surface of the housing, the microphones including:
• a first omnidirectional microphone and a second omnidirectional microphone disposed at positions which are axisymmetric with a line segment as a symmetric axis, the line segment extending in a radial direction from a center of a diaphragm of the speaker;
• and
• a third omnidirectional microphone disposed at a position which is on the symmetric axis and is closer to the speaker than the first omnidirectional microphone and the second omnidirectional microphone are;
• and
• a sound processor including:
• a beam former which is connected to the first omnidirectional microphone and the second omnidirectional microphone and forms a bidirectionality in which directionality is strong in two directions each perpendicular to the symmetric axis and is weak in two directions each along the symmetric axis;
• and
• an echo cancel unit which is connected to the beam former and the third omnidirectional microphone and removes a sound signal having been output from the third omnidirectional microphone from a sound signal having been output from the beam former,
• wherein, on the first surface of the housing, there are provided a sound emission hole provided at a position facing the diaphragm of the speaker;
• a microphone housing recessed part which houses the microphone;
• a microphone cover which covers the microphone housing recessed part;
• and
• sound collection holes provided in the microphone cover, and
• wherein the hands-free speech communication device comprises a first microphone housing part, a second microphone housing part, and a third microphone housing part each of which is provided in the microphone cover to house each of the microphones such that the first microphone housing part, the second microphone housing part, and the third microphone housing part project from an inner surface of the microphone cover;
• and
• a cushion member both surfaces of which are given adhesiveness and which are provided to fix the microphone cover on the microphone housing recessed part,
• wherein a gap is provided between the microphone housing recessed part and the microphone cover.

A hands-free speech communication device for an emergency call system, the hands-free speech communication device comprising:

• a housing disposed in a vehicle cabin;
• a speaker which is housed in the housing and outputs from a first surface of the housing a reception sound of a communication party;
• a microphone which is housed in the housing and collects sound from the first surface of the housing, the microphones including:
• a first omnidirectional microphone and a second omnidirectional microphone disposed at positions which are axisymmetric with a line segment as a symmetric axis, the line segment extending in a radial direction from a center of a diaphragm of the speaker;
• and
• a third omnidirectional microphone disposed at a position which is on the symmetric axis and is closer to the speaker than the first omnidirectional microphone and the second omnidirectional microphone are;
• and
• a sound processor including:
• a beam former which is connected to the first omnidirectional microphone and the second omnidirectional microphone and forms a bidirectionality in which directionality is strong in two directions each perpendicular to the symmetric axis and is weak in two directions each along the symmetric axis;
• and
• an echo cancel unit which is connected to the beam former and the third omnidirectional microphone and removes a sound signal having been output from the third omnidirectional microphone from a sound signal having been output from the beam former,
• wherein, on the first surface of the housing, there are provided a sound emission hole provided at a position facing the diaphragm of the speaker;
• a microphone housing recessed part which houses the microphone;
• a microphone cover which covers the microphone housing recessed part;
• and
• sound collection holes provided in the microphone cover, and
• wherein the hands-free speech communication device comprises an air permeable cushion member which is to be fit in the microphone housing recessed part;
• and
• a first microphone housing part, a second microphone housing part, and a third microphone housing part provided on the cushion member such that the first microphone housing part, the second microphone housing part, and the third microphone housing part each house each of the microphones.

A hands-free speech communication device for an emergency call system, the hands-free speech communication device comprising:

• a housing disposed in a vehicle cabin;
• a speaker which is housed in the housing and outputs from a first surface of the housing a reception sound of a communication party;
• a microphone which is housed in the housing and collects sound from the first surface of the housing, the microphones including:
• a first omnidirectional microphone and a second omnidirectional microphone disposed at positions which are axisymmetric with a line segment as a symmetric axis, the line segment extending in a radial direction from a center of a diaphragm of the speaker;
• and
• a third omnidirectional microphone disposed at a position which is on the symmetric axis and is closer to the speaker than the first omnidirectional microphone and the second omnidirectional microphone are;
• and
• a sound processor including:
• a beam former which is connected to the first omnidirectional microphone and the second omnidirectional microphone and forms a bidirectionality in which directionality is strong in two directions each perpendicular to the symmetric axis and is weak in two directions each along the symmetric axis;
• and
• an echo cancel unit which is connected to the beam former and the third omnidirectional microphone and removes a sound signal having been output from the third omnidirectional microphone from a sound signal having been output from the beam former,
• wherein the microphone is disposed such that a diaphragm of the microphone vibrates in two directions each perpendicular to a vibration direction of the diaphragm of the speaker.