0.1.2 WaveMix

libraries/WaveMix/CHANGELOG.md

@@ -6,6 +6,19 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 
+## [0.1.2] - 2022-03-26
+
+### Added
+- add **setOffset(offset)** and **getOffset()**
+- add example
+
+### Changed
+- updated **mix()** code
+
+### Fixed
+- set gain explicit in constructor.
+
+
 ## [0.1.1] - 2022-03-26
 
 ### Added

libraries/WaveMix/README.md

@@ -38,9 +38,12 @@ The weights do not need to be normalized, so one can use e.g **setWeight(7, 13)*
 - **void  setPercentage(float percentage)** sets the weight for channel A preferably to 0 <= percentage <= 100. 
 Channel B will have 100 - percentage.
 - **void  setGain(float gain)** sets the gain factor.
-An important use of gain is to amplify weak signals but one can also use it as a modulator of a signal. 
+An important use of gain is to amplify weak signals but one can also use it as a modulator of a signal.
 See examples.
 - **float getGain()** return the gain set.
+- **void  setOffset(float offset)** sets the offset for the output signal. 
+Typical used to align the zero level.
+- **float getOffset()** return the current offset used.
 - **float mix(float s1, float s2 = 0)** returns the weighted average of signal1 and signal2. 
 Signal2 is made optional to allow single signal processes e.g. modulation by **setGain()**.
 
@@ -71,32 +74,28 @@ When the gain is negative, the output is effectively inverted.
 ## Future ideas
 
 
-#### 0.2.0
+#### N channel variant.
 
-- make a N channel variant.
+- add **setValue(uint8_t channel, float value)** allow update of channels at a different frequency.
-  - add **setValue(uint8_t channel, float value)** allow update of channels at a different frequency.
+- add **getValue()**, read the current output given the value of the channels. OR
-  - add **getValue()**, read the current output given the value of the channels. OR
+- add **getValue(uint8_t mask = 0xFF)**, read the current output given the value of selected channels.
-  - add **getValue(uint8_t mask = 0xFF)**, read the current output given the value of selected channels.
+- add **setMask(uint8_t mask = 0xFF)**, select channels. ease of use?  **getValue(mask)** still needed?
-  - add **setMask(uint8_t mask = 0xFF)**, select channels. ease of use?  **getValue(mask)** still needed?
+- add **getMask()**, read back \_mask;
-  - add **getMask()**, read back \_mask;
+- note that **mix()** can be implemented with the above functions.
-  - note that **mix()** can be implemented with the above functions.
+- add **setWeight(uint8_t channel, float weight)** need internal array of weights and \_sum
-  - add **setWeight(uint8_t channel, float weight)** need internal array of weights and \_sum
+- add **float getWeight(uint8_t channel)** Normalized or not?
-  - add **float getWeight(uint8_t channel)**
+Not normalized allows easier increment per channel. Needs a **float getTotalWeight()**.
-  - add constructor **WaveMix(uint8_t channels = 8)** with parameter to set the nr of channels?
+- add constructor **WaveMix(uint8_t channels = 8)** with parameter to set the number of channels? \[NO\]
-  - or do we need **WaveMix2()**, **WaveMix4()**, **WaveMix8()**, or even **WaveMix16()**, **WaveMix24()**, **WaveMix32()** class?
+- or do we need **WaveMix2()**, **WaveMix4()**, **WaveMix8()**, or even **WaveMix16()**, **WaveMix24()**, **WaveMix32()** class?
 
 **WaveMix4()** and **WaveMix8()** seems to be realistic in terms of performance.
 **WaveMix8()** can be used for 2-8 channels, using a uint8_t mask.
-More channels will be much slower, so upon request the 16 and 32 variant?
+More channels will be much slower, so upon request the 16 and 32 variant? other variants can be obtained by masking.
 
 
 #### Medium
 
-- add **void setOffset(float)** 
+
-- add **float getOffset()**
-- add top clipping
-  - add **setMaximum(float)**
-  - add **setMinimum(float)**
 - performance test.
 
 
@@ -113,5 +112,16 @@ More channels will be much slower, so upon request the 16 and 32 variant?
   - add **increment(float)**
   - add **decrement(float)**
   - percentages? hard for multichannel?
+- default parameters
+  - gain = 1.0
+  - percentage 50%
+  - offset = 0.0
+  - **reset()** needed?
 
 
+#### wont
+- add top clipping
+  - add **setMaximum(float)**
+  - add **setMinimum(float)**
+  - needs an enable/disable per limit. 
+    becomes more complex than let the user constrain the output.

libraries/WaveMix/WaveMix.cpp

@@ -1,7 +1,7 @@
 //
 //    FILE: WaveMix.cpp
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.1
+// VERSION: 0.1.2
 // PURPOSE: Arduino library to mix two signals (A and B) with an adaptive weight.
 //     URL: https://github.com/RobTillaart/WaveMix
 //
@@ -14,6 +14,8 @@ WaveMix::WaveMix()
 {
   _weight[0] = 0.5;
   _weight[1] = 0.5;
+  _gain      = 1.0;
+  _offset    = 0.0;
 }
 
 
@@ -34,10 +36,13 @@ void WaveMix::setPercentage(float percentage)
 
 float WaveMix::mix(float s1, float s2)
 {
+  float total = 0;
   if (_gain == 0) return 0;
-  if (_weight[0] == 0) return s2 * _gain;
+  if (_weight[0] != 0) total += (_weight[0] * s1);
-  if (_weight[1] == 0) return s1 * _gain;
+  if (_weight[1] != 0) total += (_weight[1] * s2);
-  return ((_weight[0] * s1) + (_weight[1] * s2)) * _gain;
+  total *= _gain;
+  if (_offset != 0) total += _offset;
+  return total;
 }
 
 

libraries/WaveMix/WaveMix.h

@@ -2,7 +2,7 @@
 //
 //    FILE: WaveMix.h
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.1
+// VERSION: 0.1.2
 // PURPOSE: Arduino library to mix two signals (A and B) with an adaptive weight.
 //     URL: https://github.com/RobTillaart/WaveMix
 //
@@ -10,7 +10,7 @@
 
 #include "Arduino.h"
 
-#define WAVEMIX_LIB_VERSION               (F("0.1.1"))
+#define WAVEMIX_LIB_VERSION               (F("0.1.2"))
 
 
 class WaveMix
@@ -28,12 +28,16 @@ public:
   void  setGain(float gain) { _gain = gain; };
   float getGain() { return _gain; };
 
+  void  setOffset(float offset) { _offset = offset; };
+  float getOffset() { return _offset; };
+
   float mix(float s1, float s2 = 0);
 
 
 private:
   float _weight[2] = { 0.5, 0.5 };
   float _gain      = 1.0;
+  float _offset    = 0.0;
 
 };
 

libraries/WaveMix/examples/waveMix_demo_noise_offset/waveMix_demo_noise_offset.ino

@@ -0,0 +1,36 @@
+//
+//    FILE: waveMix_demo_noise_offset.ino
+//  AUTHOR: Rob Tillaart
+// PURPOSE: demo
+//     URL: https://github.com/RobTillaart/WaveMix
+//
+
+
+#include "WaveMix.h"
+
+WaveMix wm;
+
+float n = 0;
+
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println(__FILE__);
+  Serial.print("WAVEMIX_LIB_VERSION: ");
+  Serial.println(WAVEMIX_LIB_VERSION);
+
+  wm.setPercentage(95);
+}
+
+
+void loop()
+{
+  Serial.println(wm.mix(sin(n), random(1000) * 0.001) * 100);
+  n = n + 0.05;
+  delay(10);
+  wm.setOffset(int(n/20));  // just a demo
+}
+
+
+// -- END OF FILE --

libraries/WaveMix/keywords.txt

@@ -13,6 +13,9 @@ setPercentage	KEYWORD2
 setGain	KEYWORD2
 getGain	KEYWORD2
 
+setOffset	KEYWORD2
+getOffset	KEYWORD2
+
 mix	KEYWORD2
 
 

libraries/WaveMix/library.json

@@ -15,7 +15,7 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/WaveMix.git"
   },
-  "version": "0.1.1",
+  "version": "0.1.2",
   "license": "MIT",
   "frameworks": "arduino",
   "platforms": "*",

libraries/WaveMix/library.properties

@@ -1,5 +1,5 @@
 name=WaveMix
-version=0.1.1
+version=0.1.2
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
 sentence=Arduino library to mix two signals (A and B) with an adaptive weight.