Dieter Mehnert

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Normal strains of Saccharomyces cerevisiae do not use alpha-aminoadipate as a principal nitrogen source. However, alpha-aminoadipate is utilized as a nitrogen source by lys2 and lys5 strains having complete or partial deficiencies of alpha-aminoadipate reductase and, to a limited extent, by heterozygous lys2/+ strains. Lys2 mutants were conveniently(More)
Improving the naturalness of synthetic speech is an essential task in developing a text-to-speech (TTS) system. Mainly, it depends on the quality of the prosody model which is utilized in the TTS system. For our TTS system called DreSS (Dresden Speech Synthesizer), we compared three different methods for generating the F0 contour to each other as well as to(More)
A new mutation introducing a one-carbon requirement (e.g., formate) for the glycine-supplemented growth of a serine-glycine auxotroph (ser1) was correlated with a lack of glycine decarboxylase activity. The presence of oxalate decarboxylase activity or glyoxylate decarboxylase activity did not overcome the one-carbon requirement. Another mutation(More)
The synthesis of near-to-natural F0 contours is an important issue in text-to-speech and crucial to the naturalness and intelligibility of synthetic speech. In earlier studies of the first author a model of German intonation was developed that is based on the quantitative Fujisaki-model. The current paper addresses a perception experiment comparing a(More)
The fundamental experimental findings on speech and musical sounds date back to the pre-electronic era. It is interesting to estimate the accuracy of the mechanical measurement tools which have been used in that time. For this purpose, the authors performed measurements at historic acoustic resonators and at some prototypes of MAREY’s capsules. The results(More)
The early history in experimental phonetics and speech technology is featured by numerous sophisticated devices which we can study today in a number of historic collections which are located mainly at universities. In many cases, however, it is not easy to understand how these devices have been applied in an optimal way. Illustrations and historic(More)
The historic acoustic-phonetic collection (HAPS) of the TU Dresden documents the history of experimental phonetics and speech technology with a remarkably high degree of completeness. Due to some construction work, the collection could move to new and improved showrooms in the Barkhausen Building. This paper is a slightly extended version of the welcome(More)