Hearing aid device having a microphone and neckband to detect the direction of source of sound

1. A hearing aid device, comprising:

a neckband, being worn on a neck of a user, the neckband defining a virtual datum plane and a first virtual plane parallel to each other, wherein

when the neckband is worn by the user, the virtual datum plane overlaps a coronal plane of the user, and a skin portion furthest from the virtual datum plane of a throat of the user is located on the first virtual plane, and the first virtual plane is distant from the virtual datum plane by a first distance; and

a first microphone, disposed on the neckband, and being distant from the virtual datum plane by a second distance,

wherein the second distance is less than the first distance,

wherein the neckband defines an upper edge and an outer edge side surface, and a sound receiving port of the first microphone faces the upper edge side surface,

wherein the neckband defines a second virtual plane parallel to the virtual datum plane, when the user wears the neckband, a left ear and a right ear of the user are located on the second virtual plane, and a distance between the second virtual plane and the first microphone if from 0.5 centimeters to 1.5 centimeters, so that a frequency response of the first microphone approximates to a standard frequency response corresponding to a head-related transfer function,

the hearing aid device further comprising:

a storage medium, disposed in an inner space of the neckband and storing the head-related transfer function; and

a processor, disposed in the inner space of the neckband, and coupled to the storage medium and the first microphone, wherein the processor converts a first sound signal received by the first microphone to a second sound signal corresponding to an ear position of the user through the head-related transfer function, wherein the inner space of the neckband is disposed at a rear portion of the neckband.

2. The hearing aid device as recited in claim 1 , wherein the neckband has an annular shape defining a left portion, a right portion, and the rear portion connecting the left portion with the right portion, and the virtual datum plane passes through the left portion and the right portion of the neckband and extends outwardly.

3. The hearing aid device as recited in claim 2 , wherein at least one of the left portion and the right portion is configured to have a first slot, and the first microphone is disposed in the first slot.

4. The hearing aid device as recited in claim 1 , further comprising:

a second microphone, wherein the first microphone and the second microphone are disposed in the neckband in a symmetrical manner.

5. The hearing aid device as recited in claim 1 , further comprising a microphone array, wherein the microphone array comprises the first microphone and at least one second microphone.

6. The hearing aid device as recited in claim 5 , further comprising:

the processor, coupled to the microphone array, wherein the processor is configured to determine a source of the first sound signal and to control one or more microphones in the microphone array to be enabled or disabled according to the source, so as to form a sound receiving wave beam directed to the source.

7. The hearing aid device as recited in claim 5 , further comprising:

an input end, receiving a control command; and

the processor, coupled to the input end and the microphone array, wherein the processor is configured to control one or more microphones in the microphone array to be enabled or disabled according to the control command, so as to form a sound receiving wave beam corresponding to the control command.

8. The hearing aid device as recited in claim 1 , wherein the first microphone is an omni-directional microphone.

9. A hearing aid device, comprising:

a neckband, being worn on a neck of a user, the neckband defining a virtual datum plane and a first virtual plane parallel to each other, wherein

when the neckband is worn by the user, the virtual datum plane overlaps a coronal plane of the user, and a skin portion furthest from the virtual datum plane of a throat of the user is located on the first virtual plane, and the first virtual plane is distant from the virtual datum plane by a first distance; and

a first microphone, disposed on the neckband, and being distant from the virtual datum plane by a second distance,

wherein the second distance is less than the first distance,

wherein the neckband defines an upper edge surface and an outer edge side surface, and a sound receiving port of the first microphone faces the outer edge side surface,

wherein the neckband defines a second virtual plane parallel to the virtual datum plane, when the user wears the neckband, a left ear and a right ear of the user are located on the second virtual plane, and a distance between the second virtual plane and the first microphone if from 2.5 centimeters to 3.5 centimeters, so that a frequency response of the first microphone approximates to a standard frequency response corresponding to a head-related transfer function,

the hearing aid device further comprising:

a storage medium, disposed in an inner space of the neckband and storing the head-related transfer function; and

a processor, disposed in the inner space of the neckband, and coupled to the storage medium and the first microphone, wherein the processor converts a first sound signal received by the first microphone to a second sound signal corresponding to an ear position of the user through the head-related transfer function, wherein the inner space of the neckband is disposed at a rear portion of the neckband.