diff --git a/data_utils/audio.py b/data_utils/audio.py
index 3c671b69..1ad20bf3 100755
--- a/data_utils/audio.py
+++ b/data_utils/audio.py
@@ -88,7 +88,7 @@ class AudioSegment(object):
         :rtype: AudioSegment
         :raises ValueError: If the number of segments is zero, or if the 
                             sample_rate of any two segments does not match.
-        :raises TypeError: If every item in segments is not Audiosegment
+        :raises TypeError: If every item in segments is not AudioSegment
                            instance.
         """
         # Perform basic sanity-checks.
@@ -296,7 +296,7 @@ class AudioSegment(object):
         :type prior_db: float
         :param prior_samples: Prior strength in number of samples.
         :type prior_samples: float
-        :param startup_delay: Default 0.0 s. If provided, this function will
+        :param startup_delay: Default 0.0s. If provided, this function will
                               accrue statistics for the first startup_delay 
                               seconds before applying online normalization.
         :type startup_delay: float
@@ -401,7 +401,7 @@ class AudioSegment(object):
         self.subsegment(start_time, start_time + subsegment_length)
 
     def convolve(self, impulse_segment, allow_resample=False):
-        """Convolve this audio segment with the given filter.
+        """Convolve this audio segment with the given impulse_segment.
 
         Note that this is an in-place transformation.
 
diff --git a/data_utils/speech.py b/data_utils/speech.py
index 66f22b24..94ead1e8 100755
--- a/data_utils/speech.py
+++ b/data_utils/speech.py
@@ -75,11 +75,11 @@ class SpeechSegment(AudioSegment):
         :rtype: SpeechSegment
         :raises ValueError: If the number of segments is zero, or if the 
                             sample_rate of any two segments does not match.
-        :raises TypeError: If every item in segments is not Audiosegment
+        :raises TypeError: If every item in segments is not SpeechSegment
                            instance.
         """
         if len(segments) == 0:
-            raise ValueError("No audio segments are given to concatenate.")
+            raise ValueError("No speech segments are given to concatenate.")
         sample_rate = segments[0]._sample_rate
         transcripts = ""
         for seg in segments:
@@ -116,7 +116,7 @@ class SpeechSegment(AudioSegment):
         :rtype: SpeechSegment
         """
         audio = Audiosegment.slice_from_file(filepath, start, end)
-        return cls(audio.samples, audio.sample_rate, transcripts)
+        return cls(audio.samples, audio.sample_rate, transcript)
 
     @classmethod
     def make_silence(cls, duration, sample_rate):
@@ -128,7 +128,7 @@ class SpeechSegment(AudioSegment):
         :param sample_rate: Sample rate.
         :type sample_rate: float
         :return: Silence of the given duration.
-        :rtype: AudioSegment
+        :rtype: SpeechSegment
         """
         audio = AudioSegment.make_silence(duration, sample_rate)
         return cls(audio.samples, audio.sample_rate, "")