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NNLS Chroma analyses a single channel of audio using frame-wise spectral input from the Vamp host. The plugin was originally developed to extract treble and bass chromagrams for subsequent use in chord extraction methods. The spectrum is transformed to a log-frequency spectrum (constant-Q) with three bins per semitone. On this representation, two processing steps are performed:

•tuning, after which each centre bin (i.e. bin 2, 5, 8, …) corresponds to a semitone, even if the tuning of the piece deviates from 440 Hz standard pitch.
•running standardisation: subtraction of the running mean, division by the running standard deviation. This has a spectral whitening effect.

The processed log-frequency spectrum is then used as an input for NNLS approximate transcription (using a dictionary of harmonic notes with geometrically decaying harmonics magnitudes). The output of the NNLS approximate transcription is semitone-spaced. To get the chroma, this semitone spectrum is multiplied (element-wise) with the desired profile (chroma or bass chroma) and then mapped to 12 bins. The resulting chroma frames can be normalised by (dividing by) their norm (L1, L2 and maximum norm available).

One-year membership to the Pro Bono Society for 2022/2023.

Membership is open to all Queen Mary students.

pYIN (Probabilistic YIN) is a modification of the well-loved YIN algorithm for fundamental frequency (F0) estimation in monophonic audio.

This plugin's main features are:
• an implementation of pYIN for pitch tracking and
• a note-tracking algorithm based on the pYIN pitch track

The plugin is written in C++ and can be used by any Vamp host such as Sonic Visualiser and Sonic Annotator. It is also used in the melody annotation program Tony.

Bar and Beat Tracker analyses a single channel of audio and estimates the positions of bar lines and the resulting counted metrical beat positions within the music (where the first beat of each bar is "1", the equivalent of counting in time to the music). It is closely related to the Tempo and Beat Tracker, producing the same results for beat position as that plugin's "New" beat tracking method.

This transaction is intended for students studying a Science and Engineering Degree with Foundation Year. Once you have paid your deposit, please keep hold of the receipt as you will need to bring this to a clicker collection session.

If this payment is for a replacement clicker later in the year, then please bring your receipt to the Fogg Reception. After you have completed the Foundation Year, you will need to return your clicker, at which point you will receive your deposit back.

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Membership to the Student Advancement Society for 2022/23. Membership is open to all Queen Mary students. Members will be able to access members-only events, workshops, exclusive careers guides, mentorship, and the member’s hub on our website.

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