Although acoustics is an ancient science with a history of at least many years, electroacoustics is still one of the younger disciplines. Since the invention of the electron tube, the means of processing and processing sound signals have been developed. Nevertheless, the development of Electroacoustics is extremely rapid. Electroacoustics is a science that studies the principle and technology of acoustic electric conversion and the storage, processing, transmission, measurement and utilization of acoustic signals. It involves a wide range of frequencies, ranging from very low frequency infrasound to several gigahertz (10) of ultra-high frequency ultrasound. Generally, electroacoustics belongs to the audible range.
In electroacoustic devices, electrical part, mechanical part and acoustic part coexist. For the electrical part, we have long been used to depicting it in the form of electrical circuits. Since many laws in electrical circuits have been summarized into relevant theorems and laws, it is generally unnecessary to start from the original calculus equation when solving electrical problems, so that the engineering calculation is greatly simplified.
So, is there a similar situation in mechanical and acoustic problems? Since the electrical parts of microphones and loudspeakers can be represented by electrical lines, can their mechanical and acoustic parts also be represented by electrical lines, and can their mechanical and acoustic parts also be described by what lines?
The answer is yes.
The mechanical system described in a way similar to electrical circuit is called mechanical analogy circuit or mechanical circuit, so the laws and theorems in electrical circuit are also applicable to mechanical circuit. This method of analyzing mechanical problems is called "force electric analogy" or "machine electric analogy". Similarly, there are "acoustic analogy route" or "acoustic circuit" and "acoustic electrical analogy".
Therefore, a loudspeaker or a microphone can be represented by a complete "force sound electric circuit" diagram, and the connection relationship between them and the electrical system can be depicted on a circuit diagram. The analysis of this electroacoustic device brings great convenience. The study of this analytical method is called electroacoustics.