diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 3b530f5f..72feea4c 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -5,7 +5,7 @@ sc_usb_audio Change Log
 -----
     - ADDED:      UserBufferManagementInit() to reset any state required in UserBufferManagement()
     - ADDED:      I2S output up-sampling (enabled when AUD_TO_USB_RATIO is > 1)
-    - ADDED:      PDM Mic decimator output rate can now be controlled independently (via MICS_TO_AUD_RATIO)
+    - ADDED:      PDM Mic decimator output rate can now be controlled independently (via AUD_TO_MICS_RATIO)
     - CHANGE:     Rename I2S input down-sampling (enabled when AUD_TO_USB_RATIO is > 1, rather than via I2S_DOWNSAMPLE_FACTOR)
     - RESOLVED:   Crosstalk between input channels when I2S input down-sampling is enabled
     - RESOLVED:   Mic decimation data tables properly sized when mic sample-rate < USB audio sample-rate
diff --git a/module_usb_audio/audio_io/audio_io.xc b/module_usb_audio/audio_io/audio_io.xc
index ab768d6d..b7b020c5 100755
--- a/module_usb_audio/audio_io/audio_io.xc
+++ b/module_usb_audio/audio_io/audio_io.xc
@@ -501,7 +501,7 @@ unsigned static deliver(chanend c_out, chanend ?c_spd_out,
 #endif
 
     unsigned audioToUsbRatioCounter = 0;
-    unsigned micsToAudioRatioCounter = 0;
+    unsigned audioToMicsRatioCounter = 0;
 
 #if (AUD_TO_USB_RATIO > 1)
     union i2sInDs3
@@ -821,7 +821,7 @@ unsigned static deliver(chanend c_out, chanend ?c_spd_out,
 #endif
 
 #if (NUM_PDM_MICS > 0)
-                if ((MICS_TO_AUD_RATIO - 1) == micsToAudioRatioCounter)
+                if ((AUD_TO_MICS_RATIO - 1) == audioToMicsRatioCounter)
                 {
                     /* Get samples from PDM->PCM converter */
                     c_pdm_pcm <: 1;
@@ -833,11 +833,11 @@ unsigned static deliver(chanend c_out, chanend ?c_spd_out,
                             c_pdm_pcm :> samplesIn[readBuffNo][i];
                         }
                     }
-                    micsToAudioRatioCounter = 0;
+                    audioToMicsRatioCounter = 0;
                 }
                 else
                 {
-                    ++micsToAudioRatioCounter;
+                    ++audioToMicsRatioCounter;
                 }
 #endif
             }
@@ -1328,7 +1328,7 @@ chanend ?c_config, chanend ?c
 
 #if NUM_PDM_MICS > 0
                 /* Send decimation factor to PDM task(s) */
-                c_pdm_in <: curSamFreq / MICS_TO_AUD_RATIO;
+                c_pdm_in <: curSamFreq / AUD_TO_MICS_RATIO;
 #endif
 
 #ifdef ADAT_TX
diff --git a/module_usb_audio/devicedefines.h b/module_usb_audio/devicedefines.h
index 51981abc..c9a195c5 100644
--- a/module_usb_audio/devicedefines.h
+++ b/module_usb_audio/devicedefines.h
@@ -136,17 +136,16 @@
 #endif
 
 /**
- * @brief Ratio of the PDM microphone decimator sample rate to the I2S sample
- *        rate. Up and down-sampling will be enabled as necessary when the rates
- *        differ.
+ * @brief Ratio of the I2S sample rate to the PDM microphone decimator sample
+ *        rate.
  *
- * Default: 1 i.e. PDM microphone decimator and I2S are running at the sample rate.
+ * Default: 1 i.e. I2S and PDM microphone decimators are running at the same sample rate.
  */
-#ifndef MICS_TO_AUD_RATIO
-#define MICS_TO_AUD_RATIO (1)
+#ifndef AUD_TO_MICS_RATIO
+#define AUD_TO_MICS_RATIO (1)
 #else
-    #if (MICS_TO_AUD_RATIO != 3) && (MICS_TO_AUD_RATIO != 1)
-        #error Unsupported PDM microphone decimator to I2S sample rate ratio
+    #if (AUD_TO_MICS_RATIO != 3) && (AUD_TO_MICS_RATIO != 1)
+        #error Unsupported I2S to PDM microphone decimator sample rate ratio
     #endif
 #endif
 
diff --git a/module_usb_audio/pdm_mics/pdm_mic.xc b/module_usb_audio/pdm_mics/pdm_mic.xc
index 326823b4..7a6fc91d 100644
--- a/module_usb_audio/pdm_mics/pdm_mic.xc
+++ b/module_usb_audio/pdm_mics/pdm_mic.xc
@@ -17,7 +17,7 @@
 #include "mic_array.h"
 #include "xua_pdm_mic.h"
 
-#define MAX_DECIMATION_FACTOR (96000/(MIN_FREQ/MICS_TO_AUD_RATIO))
+#define MAX_DECIMATION_FACTOR (96000/(MIN_FREQ/AUD_TO_MICS_RATIO))
 
 /* Hardware resources */
 in port p_pdm_clk                = PORT_PDM_CLK;