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README.md

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 # RadioDSP-Stm32f103
+
+                          THE RADIO DSP - PROJECT
+  
+   This project RadioDSP define a experimental open platform to build
+   Real Time filtering and audio digital signal elaboration from
+   a source audio signal in output form radio transceiver or receiver.
+   The RadioDSP firmware define some FIR filter and routines to perform
+   real time Noise Reduction based on various algorithm.
+   The target hardware platform is Stm32f103 - Arm Cortex-M3 based processor.
+  
+   The functions built in the RadioDSP are:
+    * Filter BPF CW  NARROW (300 HZ)
+    * Filter BPF CW  NARROW (700 Hz)
+    * Filter LPF SSB ( < 2400 Hz )
+    * Filter LPF SSB ( < 3500 Hz )
+  
+    * Noise Reduction (Exponential Moving Average   - 3 levels smoothing)
+    * Noise Reduction (Simple Moving Average        - 3 levels smoothing: 8,16,24 samples)
+  
+   NOTE: this is an experimental project and the functions can be changed
+   without any advise.
+  
+   Info to noise reduction algorithms: info: https://en.wikipedia.org/wiki/Moving_average
+  
+   Calculator used for FIR filters: https://www.arc.id.au/FilterDesign.html
+  
+   The RadioDSP use some parts of the ARM Cortex Microcontroller Software
+   Interface Standard (CMSIS).
+   The RadioDSP use some parts of STM32F103 examples by Yohanes Erwin and
+   others examples and projects free and available in the opensource
+   community.
+  
+   The RadioDSP openSource software is released under the license:
+                Common Creative - Attribution 3.0