Estimating Musical Time Information from Performed MIDI Files
نویسندگان
چکیده
Even though originally developed for exchanging control commands between electronic instruments, MIDI has been used as quasi standard for encoding and storing scorerelated parameters. MIDI allows for representing musical time information as specified by sheet music as well as physical time information that reflects performance aspects. However, in many of the available MIDI files the musical beat and tempo information is set to a preset value with no relation to the actual music content. In this paper, we introduce a procedure to determine the musical beat grid from a given performed MIDI file. As one main contribution, we show how the global estimate of the time signature can be used to correct local errors in the pulse grid estimation. Different to MIDI quantization, where one tries to map MIDI note onsets onto a given musical pulse grid, our goal is to actually estimate such a grid. In this sense, our procedure can be used in combination with existing MIDI quantization procedures to convert performed MIDI files into semantically enriched score-like MIDI files.
منابع مشابه
On the Computer Recognition of Solo Piano Music
We present work towards a computer system for the automatic transcription of piano performances. The system takes audio files containing polyphonic piano music as input, and produces MIDI output, representing the pitch, timing and volume of the musical notes. The aim of this work is not to reduce the performance data to common music notation, but to extract the performance parameters for a quan...
متن کاملAn Audio Signatures Indexing Scheme For MIDI Format Music Files
A This paper describes a method of content indexing for Multimedia Databases using binary signatures for MIDI format archives. The analysis scheme focuses on the primary audio objects of the Multimedia environment, applies a reduction mechanism and extracts characteristic patterns forming motifs (musical themes). Binary signatures are associated with these audio segments they describe. For each...
متن کاملA Robust Retrieval System of Polyphonic Music Based on Comparison of Chord Sequences
Retrieval systems for polyphonic music rely on the automatic estimation of the similarity between two musical pieces. In the case of symbolic music, existing systems consider a monophonic reduction based on melody or propose algorithms with high complexity. In this paper, a new approach is presented. Musical pieces are represented as a sequence of chords estimated from groups of notes sounding ...
متن کاملExtraction of Musical Performance Parameters from Audio Data
We present a system for the automatic extraction of musical content from audio signals containing polyphonic music. The system works off-line, taking data from audio files and producing MIDI output, representing the pitch, timing and volume of the musical notes. The initial signal processing stage is based on a STFT enhanced by a tracking phase vocoder, which interprets stable frequency compone...
متن کاملFrom Music to Visuals – and Back 2D Fourier Transform applied on Music Piano Roll Plots
When a 2D Fourier Transform is applied to piano roll plots which are often used in sequencer software, the resulting 2D graphic is a novel music visualization which reveals internal musical structure. This visualization converts the set of musical notes from the notation display in the piano roll plot to a display which shows structure over time and spectrum within a set musical time period. Th...
متن کامل