docs : adding docs

@@ -8,7 +8,7 @@ from scipy.fft import fft, fftfreq
 import math
 import time
 
-TARGET = "decibel" # frequency, decibel
+TARGET = "frequency" # frequency, decibel
 EFFECT = "pitch_shift" # pitch_shift, low_filter
 
 RATE = 44100
@@ -94,6 +94,29 @@ class Effector:
             "low_filter": self.low_filtered_sounds
         }
 
+        # save all augumented_sound to folder
+        for i in range(EFFECT_LEVEL):
+            pydub.AudioSegment(
+                data=self.augumented_sound["echo"][i].tobytes(),
+                sample_width=2,
+                frame_rate=RATE,
+                channels=1
+            ).export("./augumented_sound/echo/echo_{}.wav".format(i), format="wav")
+        for i in range(EFFECT_LEVEL):
+            pydub.AudioSegment(
+                data=self.augumented_sound["pitch_shift"][i].tobytes(),
+                sample_width=2,
+                frame_rate=RATE,
+                channels=1
+            ).export("./augumented_sound/pitch_shift/pitch_shift_{}.wav".format(i), format="wav")
+        for i in range(EFFECT_LEVEL):
+            pydub.AudioSegment(
+                data=self.augumented_sound["low_filter"][i].tobytes(),
+                sample_width=2,
+                frame_rate=RATE,
+                channels=1
+            ).export("./augumented_sound/low_filter/low_filter_{}.wav".format(i), format="wav")
+
     def change_target(self, target):
         if target not in ["decibel", "frequency", "amplitude"]:
             raise Exception("Invalid target")
@@ -246,3 +269,9 @@ while stream.is_active():
 
 stream.close()
 pa.terminate()
+
+
+# 실시간 face-chat
+# 실시간 변형을 조금더 강조하면 좋을듯 합니다.
+# 추가적인 사용 예제나 스토리를 조금더 넣으면 좋을듯.
+# 실시간으로 
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