The old-fashioned secret behind modern technology
Have you heard of Guglielmo Marconi? He is said to have invented radio at the end of the nineteenth century.
Until television became widespread, radio was one of the basic means of communication and entertainment.
The simple transistor radio may seem a little old-fashioned in these days of mobile phones, laptop computers, and iPods. However, radio waves, which are invisible and undetectable to humans, have changed the world completely.
When you use a mobile or cordless phone, a wireless network for your laptop, or switch TV channels by remote control, you are using radio waves.
So, how does it work?
Let's take a radio programme as an example.
Firstly, in the studio the voices and music are turned into electronic signals, called "voice waves ".
Next, they are made stronger by passing them through an amplifier. These stronger waves are called carrier waves' and they are passed to large aerials by the aerials send out these waves, which are now called radio waves. These are subsequently picked a receiving aerial, in this case, the one on your radio.
After this, the radio waves go through a reverse process. They are first turned back into voice waves, then passed through another amplifier, and finally sent out through speakers or headphones.
The result is your favourite music or the latest news!
The old-fashioned secret behind modern technology Have you heard of Guglielmo Marconi? He is said to have invented radio at the end of the nineteenth century. Until television became widespread, radio was one of the basic means of communication and entertainment. The simple transistor radio may seem a little old-fashioned in these days of mobile phones, laptop computers, and iPods. However, radio waves, which are invisible and undetectable to humans, have changed the world completely. When you use a mobile or cordless phone, a wireless network for your laptop, or switch TV channels by remote control, you are using radio waves. So, how does it work? Let's take a radio programme as an example. Firstly, in the studio the voices and music are turned into electronic signals, called "voice waves ".Next, they are made stronger by passing them through an amplifier. These stronger waves are called carrier waves' and they are passed to large aerials by the aerials send out these waves, which are now called radio waves. These are subsequently picked a receiving aerial, in this case, the one on your radio. After this, the radio waves go through a reverse process. They are first turned back into voice waves, then passed through another amplifier, and finally sent out through speakers or headphones. The result is your favourite music or the latest news!
การแปล กรุณารอสักครู่..
