1. A method of on-site speech broadcasting, comprising: receiving a text signal, wherein the text signal is automatically generated by an on-site text-generating device in response to a parameter in an industrial environment sensed by an on-site sensor of the on-site text-generating device reaching a predetermined value; converting the text signal to a speech signal by an on-site speech converting module disposed within an on-site speaker device separated from the on-site text-generating device; and playing the converted speech signal by using a speaker of the on-site speaker device to broadcast an alarm in the industrial environment, wherein the text signal is generated by automatically selecting the text signal from a plurality of text signals preset by an on-site user to correspond to the parameter reaching the predetermined value, wherein the on-site text-generating device further includes a human machine interface for automatically selecting a text from a plurality of texts without input of the on-site user, and a transmitting interface for transmitting the text signal, wherein the human machine interface comprises a processor for determining an event indicating a certain device in the industrial environment is abnormal based on the parameter sensed by the on-site sensor, and wherein the text of the plurality of texts corresponds to the event.
3. The method according to claim 1 , wherein the text signal comprises at least two languages.