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在许多自动化系统中,人们不仅需要用文字来显示信息,而且希望把这种信息用语言直接输出.用语言输出测量结果,会使人们感到十分方便,而且能提高效率和准确性,目前,语音合成主要有两种方式,即频域和时域两种.时域法即是对语音信号直接采样,通过A/D转换把采样值存人存贮器,然后按照输出语言的需要,适当地选取各种样本存贮,通过D/A变换来重建时域信号,则语音就被放出来了.存贮数据量的多少,取决于采样速率及量化的级数,总的来说数据量是很大的.频域法则是对语音信号进行频域变换后,再进行A/D采样存贮,经D/A转换放音,由于经过变换后的信号变化缓慢.所以数据率较低,存贮器需要量少.然而当合成单词数较少时,使用时域法将是最为有效,也是最省时间的方法.因此,作者针对现有语音电路情况,采用时域合成单词法,即满足了单词量不大的仪器仪表报讯需要,而且电路设计简单,具有新颖实用的特点.其基本原理是将所要录的语音进行译码,变成数字信号后,送入语音分配控制电路,该电路发出一控制信号,控制语音放音电路,使得语音放音电路能够正确地从语音存贮器中取出有用的语音并放出来,而对于无用的语音,则语音放音电路被控制信号屏蔽并进行快速检索.这样做是由人的耳杂的特点决定的,只有对语音按一般速度放音人才能听到声音.进
In many automation systems, people not only need to display the information in words, but also want to output the information directly in the language.Using the language to output the measurement results makes people feel convenient and can improve the efficiency and accuracy. At present, the voice Synthesis of two main ways, namely, the frequency domain and time domain 2. Time domain method is the direct sampling of voice signals, the sample value is stored by A / D converter memory, and then in accordance with the needs of the output language, properly Select a variety of sample storage, through the D / A transform to reconstruct the signal in the time domain, then the voice is released.According to the amount of data storage, depending on the sampling rate and the number of levels of quantification, in general the amount of data is Large.Frequency domain rule is the voice signal frequency domain transform, and then A / D sampling storage, the D / A conversion playback, because the signal after the change changes slowly, so the data rate is low, save However, when the number of synthesized words is small, the use of time domain method will be the most effective and time-saving method.Therefore, the author uses the method of time-domain synthesis of words to satisfy the existing voice circuits, The volume of instruments is not the need to report , And the circuit design is simple, with novel and practical features.The basic principle is to be recorded by the voice decoding, into a digital signal, into the voice distribution control circuit, the circuit sends a control signal to control the voice playback circuit So that the voice playing circuit can correctly extract the useful voice from the voice memory and release it, and for unwanted voice, the voice playing circuit is shielded by the control signal and perform quick retrieval. This is done by the human ear Miscellaneous characteristics of the decision, only the voice at a normal speed player can hear the sound