We are designing a electronics product with a microphone mounted on corner of a PCB. The PCB is placed in an ABS enclosure
A requirement is the mic should pick up sound/voice when somebody is speaking across the room or hallway. This works well when there is no enclosure installed. When the ABS enclosure with small holes to let the sound/voice enter is installed the distance at which sound is detected is greatly reduced. The mic is such that is is 30mm away from the enclosure
I am looking for ideas as to what can be changed in placement of MIC, enclosure design, sound guide tunnels etc to enable the system to pick up at level similar to when we have the enclosure.
All ideas are greatly appreciated.
A requirement is the mic should pick up sound/voice when somebody is speaking across the room or hallway. This works well when there is no enclosure installed. When the ABS enclosure with small holes to let the sound/voice enter is installed the distance at which sound is detected is greatly reduced. The mic is such that is is 30mm away from the enclosure
I am looking for ideas as to what can be changed in placement of MIC, enclosure design, sound guide tunnels etc to enable the system to pick up at level similar to when we have the enclosure.
All ideas are greatly appreciated.
Random thoughts:
Connect some of the holes to make slots, thus increasing the area for sound to enter.
If the mic is 30mm back from the opening, munt the mic up off the board to make it closer. You may need to support it with a small piece of something.
Or make a small cylinder from plastic tubing or something to slip over the mic element and cut to length to make a sound duct from mic up to the rear of the housing opening.
And maybe increase the gain of the audio input to compensate for the reduced signal level.
Connect some of the holes to make slots, thus increasing the area for sound to enter.
If the mic is 30mm back from the opening, munt the mic up off the board to make it closer. You may need to support it with a small piece of something.
Or make a small cylinder from plastic tubing or something to slip over the mic element and cut to length to make a sound duct from mic up to the rear of the housing opening.
And maybe increase the gain of the audio input to compensate for the reduced signal level.
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