Dual microphone background noise reduction module for Windows
We need a dual microphone background noise reduction module to enhance speech signal for Windows XP/Vista/7 (32/64 bit) for language laboratory. This module need to reduce general lab noise (fan noise and computer noise) + neighbor students speech.
Each student wear a special headset with 2 microphones #2a & #2b on both ear pieces to record the general lab noise noise (fan noise, computer noise) + neighbor students speech and 1 microphone #1 to record the student's own speech.
Microphone #1 will be connected to a usb sound card (cmedia 6206 chipset).
Microphone #2a & #2b will be connected to an A/D input port on the computer.
The dual microphone background noise reduction module will use microphone #2a & #2b 's input as reference to filter similar noise inside the microphone #1's input so the system can record a clear and clean speech recording for teacher assessment.
Since we already have our own sound card driver so we just need a module to compare and filter the general lab noise (fan noise and computer noise) + neighbor students speech.
Note: general lab noise (fan noise and computer noise) in general not much but neighbor students speech quite much because students are sitting close.
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I would model the waveforms as linear combinations of 3 to 6 independent noise processes and output the one most strongly coupled to the selected microphone.