英语翻译
要求翻译通顺，不要用在线翻译。需要交的，谢谢了Speech Synthesis is concerned with the generation of speech by computer.It is important to divide the general field into two areas which are frequently developed separately.
The first of these two areas is often referred to as low-level synthesis,i.e.the actual production of the sound which is to simulate the human acoustic speech signal.Within this area we are concerned with considerations such as the kind of model we want to adopt (spectrum synthesis,articulatory synthesis or synthesis in the time domain),the size of the units used to concatenate the speech utterance,and the signal processing techniques used in the different methods of generating the speech output.