HumDetector¶

standard mode | Audio Problems category

Inputs¶

signal (vector_real) - the input audio signal

Outputs¶

r (matrix_real) - the quantile ratios matrix

frequencies (vector_real) - humming tones frequencies

saliences (vector_real) - humming tones saliences

starts (vector_real) - humming tones starts

ends (vector_real) - humming tones ends

Parameters¶

Q0 (real ∈ (0, 1), default = 0.1) :
low quantile

Q1 (real ∈ (0, 1), default = 0.55) :
high quatile

detectionThreshold (real ∈ (0, ∞), default = 5) :
the detection threshold for the peaks of the r matrix

frameSize (real ∈ (0, ∞), default = 0.4) :
the frame size with which the loudness is computed [s]

hopSize (real ∈ (0, ∞), default = 0.2) :
the hop size with which the loudness is computed [s]

maximumFrequency (real ∈ (0, ∞), default = 400) :
maximum frequency to consider [Hz]

minimumDuration (real ∈ (0, ∞), default = 2) :
minimun duration of the humming tones [s]

minimumFrequency (real ∈ (0, ∞), default = 22.5) :
minimum frequency to consider [Hz]

numberHarmonics (integer ∈ (0, ∞), default = 1) :
number of considered harmonics

sampleRate (real ∈ (0, ∞), default = 44100) :
the sampling rate of the audio signal [Hz]

timeContinuity (real ∈ (0, ∞), default = 10) :
time continuity cue (the maximum allowed gap duration for a pitch contour) [s]

timeWindow (real ∈ (0, ∞), default = 10) :
analysis time to use for the hum estimation [s]

Description¶

This algorithm detects low frequency tonal noises in the audio signal. First, the steadiness of the Power Spectral Density (PSD) of the signal is computed by measuring the quantile ratios as described in [1]. After this, the PitchContours algorithm is used to keep track of the humming tones [2].

References:

[1] Brandt, M., & Bitzer, J. (2014). Automatic Detection of Hum in Audio Signals. Journal of the Audio Engineering Society, 62(9), 584-595.

[2] J. Salamon and E. Gómez, Melody extraction from polyphonic music signals using pitch contour characteristics, IEEE Transactions on Audio, Speech, and Language Processing, vol. 20, no. 6, pp. 1759–1770, 2012.

Source code¶

C++ source code

C++ header file