Farsi Speech Synthesis Using Pitch Frequency in Flite Software

This survey introduces a model and the implementation of a speech synthesizer in Farsi language using Flite software. In this approach, the mean and the standard deviation of pitch frequency of each voiced phoneme are first calculated by a database of Farsi sentences (Fars Dat). Then, the changes of each phoneme of the desired phrase are inserted into the software through the calculation of a value. The main feature of this synthesizer is its ability to change text to speech within Farsi pronunciation and in Farsi dialect. At the end of this paper, the results of this algorithm are compared to the changes of pitch frequencies extracted from the database of Farsi sentences. Some examples of the sentences from the database are also synthesized using our proposed method on Flite Software. The value of MOS test for understandability, naturalness and good sounding of those sentences are 4.4, 4.2, and 4.6 for the training set, respectively, and 4.2, 4.1, and 4.3 for the test set, respectively.