Abstract
A tutorial is presented with which the student first gets basic knowledge about the human speech production. It is explained that speech is generated by an air flow coming from the lungs which is, in the case of voiced sounds, periodically interrupted by the vocal cords and then modulated with the resonance rooms of the mouth and nasal tract. For voiceless sounds (like ‘‘f,’’ ‘‘sch’’) the vocal cords are open and the air flow excites the mouth and nasal tract with a noise-like pressure signal. It is therefore adequate to distinguish two components in the speech production: the excitation and the articulation component. In our tutorial, the two components are realized (simulated) by a technical system, known as linear predictive vocoder (LPC vocoder). Its principle is explained by a short text and some graphics and the analogy to the human speech organs is clearly shown. The main emphasis is put on the control parameters of the system—in the main the pitch frequency and the vocal tract parameters (prediction coefficients)—and the effect when.
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