ultrasound and infrasound 超声波 次声波

Multiple ultrasonic waves in the air can be converted into audible sound waves.
If this is possible, then:

• Audible sound waves could be transformed into speech.
• Speech could appear near certain animals.
• Speech could appear near certain objects.
• Speech could emerge at specific coordinates in the air.
• Speech could even emerge inside the human body.

If a certain type of ultrasonic wave is continuously present in the air, it would be possible to design a simple device that emits it.
It could also cause certain human-like sounds to have particular effects.

This is somewhat similar to what appears in certain novels, where rules can be simplified into easily triggered mechanisms.

多个超声波在空气中转可以听到的声波
如果可以
就可以
把可以听到的声波转成说话声
在一些动物附近转成说话声
在一些物体附近转成说话声
在空气中某个坐标出现说话声
在身体中出现说话声

如果空气中一直有某种超声波
就可以把某种发射超声波的做成简易设备
也可以使一些类人经常发出的声音有某种效果

也是类似某种小说中出现的把规则做成可以简易触发的