Abstract
For a long time articulatory modeling of vocal tract and speech production organs have been widely researched. This paper firstly introduced the natural speech production process. Then the paper presents the methods for articulatory measurements, geometrical synthesis of articulation and synthesis of speech sounds. The measurement methods are divided to static and dynamic methods according to whether they are capable of capturing movement or not. In surveying geometrical synthesis the paper concentrates especially on movement parametrisation and trajectory generation. Central topics in speech sound synthesis are the transmission line method. Finally the possible future directions are given.