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Signal Model Based Synthesis of the Sound of Organ Flue Pipes

Hallgatói project
1998 - 1999

Local supervisor: Sujbert László
Local contact person: Márkus János
Official project supervisor: BME MIT DSP labor

Offering small, portable and more economical organs for home, studio and stage applications is a long-standing problem in the research of sound synthesis methods. The well-known PCM or Sampling synthesis, which records the sound, loops it and plays it back cannot take into account the stochastic parameters of the sound. During this project, another method has been developed, which models also these effects.

Signal model based synthesis could be a well-balanced compromise between computation efficiency and sound quality. As most of the musical instruments generate nearly periodic sound, the signal model is based on the discrete-time model of the periodic signals.

The final organ-model has been set during the experiments. The model has three part with three different function:

  • "generator" part (the periodic model and a noise generator)
  • "transient part" (responsible for the attack and decay transient behaviour of the sound, using independent IIR filters, as envelope-generators)
  • "other effects" part (includes the effect of the different position of the sound, the effect of the hall (reverberation), etc.)

During the project, the following methods have been developed:

  • An analysis program, which extracts the required parameters from measured sound samples
  • An off-line synthesis program, which converts MIDI files to WAVE files using the parameters
  • A real-time implementation of the model on a Digital Signal Processor

More information and demo recordings are available on the official homepage of the project.

Further information about the project:
Official homepage:
Department homepage:
Official email address: