Correct phase interpolation to correct very minor error

RadioIQMixer_F32.cpp

@@ -20,6 +20,8 @@
  * Inputs are either real or I-Q per bool twoChannel.   Rev Apr 2021
  *
  * MIT License,  Use at your own risk.
+ *
+ *  Rev 28 Mar 2022 Correctedslight interpolation error.  RSL
 */
 
 #include "RadioIQMixer_F32.h"
@@ -78,7 +80,7 @@ void RadioIQMixer_F32::update(void) {
           a = sinTable512_f32[index];
           b = sinTable512_f32[index+1];
           // Linear interpolation and multiplying (DBMixer) with input
-          blockOut_i->data[i] = blockIn0->data[i] * (a + 0.001953125*(b-a)*deltaPhase);
+          blockOut_i->data[i] = blockIn0->data[i] * (a + (b-a)*deltaPhase);
 
           /* Repeat for cosine by adding 90 degrees phase  */
           index = (index + 128) & 0x01ff;
@@ -87,9 +89,9 @@ void RadioIQMixer_F32::update(void) {
           b = sinTable512_f32[index+1];
           /* deltaPhase will be the same as used for sin  */
           if(twoChannel)
-             blockOut_q->data[i] = blockIn1->data[i]*(a + 0.001953125*(b-a)*deltaPhase);
+             blockOut_q->data[i] = blockIn1->data[i]*(a + (b-a)*deltaPhase);
           else
-             blockOut_q->data[i] = blockIn0->data[i]*(a + 0.001953125*(b-a)*deltaPhase);
+             blockOut_q->data[i] = blockIn0->data[i]*(a + (b-a)*deltaPhase);
        }
     }
     else {   // Do a more flexible update, i.e., not doSimple
@@ -103,7 +105,7 @@ void RadioIQMixer_F32::update(void) {
           b = sinTable512_f32[index+1];
           // We now have a sine value, so multiply with the input data and save
           // Linear interpolate sine and multiply with the input and amplitude (about 1.0)
-          blockOut_i->data[i] = amplitude_pk * blockIn0->data[i] * (a + 0.001953125*(b-a)*deltaPhase);
+          blockOut_i->data[i] = amplitude_pk * blockIn0->data[i] * (a + (b-a)*deltaPhase);
 
           /* Shift forward phaseS_C  and get cos. First, the calculation of index of the table */
           phaseC = phaseS + phaseS_C;
@@ -115,9 +117,9 @@ void RadioIQMixer_F32::update(void) {
           b = sinTable512_f32[index+1];
           // Same as sin, but leave amplitude of LO at +/- 1.0
           if(twoChannel)
-             blockOut_q->data[i] = blockIn1->data[i]*(a + 0.001953125*(b-a)*deltaPhase);
+             blockOut_q->data[i] = blockIn1->data[i]*(a + (b-a)*deltaPhase);
           else
-             blockOut_q->data[i] = blockIn0->data[i]*(a + 0.001953125*(b-a)*deltaPhase);
+             blockOut_q->data[i] = blockIn0->data[i]*(a + (b-a)*deltaPhase);
         }
     }
     AudioStream_F32::release(blockIn0);   // Done with this