GapsDetector¶

streaming mode | Audio Problems category

Inputs¶

frame (vector_real) - the input frame (must be non-empty)

Outputs¶

starts (vector_real) - the start indexes of the detected gaps (if any) in seconds

ends (vector_real) - the end indexes of the detected gaps (if any) in seconds

Parameters¶

attackTime (real ∈ [0, ∞), default = 0.05) :
the attack time of the first order lowpass in the attack phase [ms]

frameSize (integer ∈ [0, ∞), default = 2048) :
frame size used for the analysis. Should match the input frame size. Otherwise, an exception will be thrown

hopSize (integer ∈ [0, ∞), default = 1024) :
hop size used for the analysis

kernelSize (integer ∈ [1, ∞), default = 11) :
scalar giving the size of the median filter window. Must be odd

maximumTime (real ∈ (0, ∞), default = 3500) :
time of the maximum gap duration [ms]

minimumTime (real ∈ (0, ∞), default = 10) :
time of the minimum gap duration [ms]

postpowerTime (real ∈ (0, ∞), default = 40) :
time for the postpower calculation [ms]

prepowerThreshold (real ∈ (-∞, ∞), default = -30) :
prepower threshold [dB].

prepowerTime (real ∈ (0, ∞), default = 40) :
time for the prepower calculation [ms]

releaseTime (real ∈ [0, ∞), default = 0.05) :
the release time of the first order lowpass in the release phase [ms]

sampleRate (real ∈ (0, ∞), default = 44100) :
sample rate used for the analysis

silenceThreshold (real ∈ (-∞, ∞), default = -50) :
silence threshold [dB]

Description¶

This algorithm uses energy and time thresholds to detect gaps in the waveform. A median filter is used to remove spurious silent samples. The power of a small audio region before the detected gaps (prepower) is thresholded to detect intentional pauses as described in [1]. This technique is extended to the region after the gap. The algorithm was designed for a framewise use and returns the start and end timestamps related to the first frame processed. Call configure() or reset() in order to restart the count.

References:: [1] Mühlbauer, R. (2010). Automatic Audio Defect Detection.

Source code¶

C++ source code

C++ header file