![]() ![]() This procedure was among the first that made synthetic speech sound more human. A unit selection algorithm found the best match for a particular sound. The method uses an extensive database of source sounds segmented into heterogeneous units. Text-to-speech generation followed the trend by replacing large vocoder machines with concatenative data-driven sound synthesis. ![]() The second half of the 20th century was marked by the development of computer-based systems. The second one uses that signal to produce a synthetic sound. The first part analyzes incoming speech signals from natural sound parameters. Many consider it as the basis for modern text-to-speech devices. Its users had to spend months training and still produced intelligible language only if paired with the context of a question.ĭudley’s second attempt at speech synthesis came in the form of a device called channel vocoder. Ten parallel resonators were responsible for covering all frequencies of the speech spectrum.īut, the system proved to be too difficult to operate. It was operated via a keyboard, which controlled various aspects of the sound. Homer Dudley introduced his “Voder,” which was the first electronic speech synthesizer. The 1930s introduced new ways on how to generate text-to-speech. Source: Wolfgang von Kempelen's speaking machine | Wikipedia Electrical Era His version produced vowels and consonants, as well as some words. Charles Wheatstone improved upon it in the 19th century. It could generate single sounds and some sound combinations. Soon after, in 1791, Wolfgang von Kempelen presented his Acoustic-Mechanical Speech Machine. Keep in mind that this instrument was an acoustic resonator, a mechanical device. The machine could produce five long vowels (/a/, /e/, /i/, /o/, /u/) artificially. The first device that resembled speech synthesis was built in 1779 by Christian Kratzenstein. ![]() Speech synthesis had three stages of evolution: mechanical, electrical, and digital. Let us first take a look at how text-to-speech came to be what it is today. Now, with the help of artificial intelligence, text-to-speech technology has reached new levels. Throughout history, several techniques were developed to make it sound more human. By simply clicking a button, digital devices can convert text into audio. Text-to-Speech generation has always been a long aspiration of the human race. ![]()
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