ECE 4180 - Final Project Team
/
WalkieTalkie
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Dependencies: mbed 4DGL-uLCD-SE mbed-rtos nRF24L01P
Diff: Microphone.cpp
- Revision:
- 33:5d86c111d9bc
- Parent:
- 8:0222df74596e
--- a/Microphone.cpp Mon Apr 23 16:05:32 2018 +0000
+++ b/Microphone.cpp Wed Apr 25 15:39:03 2018 +0000
@@ -2,7 +2,7 @@
#define UINT8_MAX 255
Microphone::Microphone (PinName pin):
- _pin(pin)
+ _pin(pin), dc(.67 / 3.3)
{}
float Microphone::read()
@@ -18,5 +18,11 @@
uint8_t Microphone::getData()
{
// This can be better but this should work for now
- return (read() - (0.67/3.3)) * UINT8_MAX;
+ const static float alpha = 0.99999f;
+ float sample = (float)read();
+
+ dc = alpha*dc + (1.0f - alpha)*sample;
+
+ sample = 0.5f + (sample - dc)* 33.0f;
+ return sample * UINT8_MAX;
}
\ No newline at end of file