Audio2Midi¶

standard mode | Pitch category

Inputs¶

frame (vector_real) - the input frame to analyse

Outputs¶

pitch (real) - pitch given in Hz

loudness (real) - detected loudness in decibels

messageType (vector_string) - the output of MIDI message type, as string, {noteoff, noteon, noteoff-noteon}

midiNoteNumber (vector_real) - the output of detected MIDI note number, as integer, in range [0,127]

timeCompensation (vector_real) - time to be compensated in the messages

Parameters¶

applyTimeCompensation (bool ∈ {true, false}, default = true) :
whether to apply time compensation correction to MIDI note detection

hopSize (integer ∈ [1, ∞), default = 32) :
equivalent to I/O buffer size

loudnessThreshold (real ∈ [-∞, 0], default = -51) :
loudness level above/below which note ON/OFF start to be considered, in decibels

maxFrequency (real ∈ [10, 20000], default = 2300) :
maximum frequency to detect in Hz

midiBufferDuration (real ∈ [0.005, 0.5], default = 0.05) :
duration in seconds of buffer used for voting in MidiPool algorithm

minFrequency (real ∈ [10, 20000], default = 60) :
minimum frequency to detect in Hz

minNoteChangePeriod (real ∈ (0, 1], default = 0.03) :
minimum time to wait until a note change is detected (testing only)

minOccurrenceRate (real ∈ [0, 1], default = 0.5) :
rate of predominant pitch occurrence in MidiPool buffer to consider note ON event

minOffsetCheckPeriod (real ∈ (0, 1], default = 0.2) :
minimum time to wait until an offset is detected (testing only)

minOnsetCheckPeriod (real ∈ (0, 1], default = 0.075) :
minimum time to wait until an onset is detected (testing only)

pitchConfidenceThreshold (real ∈ [0, 1], default = 0.25) :
level of pitch confidence above which note ON/OFF start to be considered

sampleRate (integer ∈ [8000, ∞), default = 44100) :
sample rate of incoming audio frames

transpositionAmount (integer ∈ (-69, 50), default = 0) :
Apply transposition (in semitones) to the detected MIDI notes.

tuningFrequency (integer ∈ {432, 440}, default = 440) :
tuning frequency for semitone index calculation, corresponding to A3 [Hz]

Description¶

Wrapper around Audio2Pitch and Pitch2Midi for real time application. This algorithm has a state that is used to estimate note on/off events based on consequent compute() calls.

Source code¶

C++ source code

C++ header file