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Fix [2254919] Silence doesn't trim digitial silence correctly

--- a/ChangeLog

+++ b/ChangeLog

@@ -39,6 +39,8 @@

 Effects:

+  o Fix [2254919] Silence doesn't trim digitial silence correctly.  (robs)

+

 Other new features:

   o Added libSoX example #4: concatenating audio files.  (robs)

--- a/sox.1

+++ b/sox.1

@@ -2953,7 +2953,7 @@

 [\fIbelow-periods duration threshold\fR[\fBd\fR\^|\^\fB%\fR]]

 .SP

 Removes silence from the beginning, middle, or end of the audio.

-Silence is anything below a specified threshold.

+`Silence' is determined by a specified threshold.

 .SP

 The \fIabove-periods\fR value is used to indicate if audio should be

 trimmed at the beginning of the audio. A value of zero indicates no

@@ -3937,7 +3937,7 @@

 Allowed gap (in seconds) between quieter/shorter bursts of audio to

 include prior to the detected trigger point.

 .IP \fB\-p\ \fInum\fR\ (0)

-The amount of audio (in seconds) to preseve before the trigger point

+The amount of audio (in seconds) to preserve before the trigger point

 and any found quieter/shorter bursts.

 .RE

 .TP

--- a/src/silence.c

+++ b/src/silence.c

@@ -285,7 +285,7 @@

   else if (unit == 'd')

     scaled_value = linear_to_dB(scaled_value);

-  return scaled_value >= threshold;

+  return scaled_value > threshold;

 }

 static sox_sample_t compute_rms(sox_effect_t * effp, sox_sample_t sample)