Red is the switch of the set-top box, and the box is the switch of the TV.
You can refer to the instruction manual. Or find someone who used to sell TV.
A TV remote controller is a device for remote control of machines. It can realize the function of TV channel switching.
Chinese TV remote controller
Function can realize the conversion of TV channels.
A device used to remotely control a machine.
Assembly of integrated circuit board and button
catalogue
1 Introduction
2 history
invent
develop
3 working principle
1 Introduction Editor
A TV remote controller is a device for remote control of machines. Modern remote controllers are mainly composed of integrated circuit boards and buttons for generating different information.
There is a CPU in it, which is the computer of the TV. The CPU inputs the password information of various menus of the TV set during manufacturing, and the remote control transmitter of the TV set can realize remote control of the TV set as long as it issues the corresponding password.
2 history editor
invent
The TV remote control is an out-and-out lazy invention. Nowadays, the remote control has many functions, and Samsung even introduced a smart remote control with built-in operating system.
But who invented the first remote control in the world and what did it look like? The answer is surprising,
196 1 year, RCA Victor produced the first wireless remote controller, which was fully functional from the beginning, similar to the basic functions of the current TV remote controller, including color, brightness, sound, channel switching and tuning functions, as well as remote control on and off. The appearance is also very simple. You can look at the pictures if you are interested.
develop
1950 the first wired/wireless remote controller was born.
The world's first wireless TV remote control
Until 1950, the idea of wired remote control finally came true.
Zenith (later acquired by LG), an American electrical appliance company, developed the first TV remote control. The product at this time is a wired remote control. Then 1955, the same company mentioned above invented a wireless remote control device called "Flashmatic". But this device can't tell whether the light beam comes from the remote control, and it must be aligned to control it. Because it is difficult to control in operation, it has not been recognized and promoted by the market.
1956 ultrasonic remote controller was born.
There are only four simple buttons on the ultrasonic remote control, volume mute, channel increase, channel decrease and switch.
1956, robert adler developed the zenith space command, which used ultrasonic waves to adjust the channel and volume, and the frequency of each key was different. However, this device may also be interfered by ordinary ultrasonic waves, such as animal sounds or ultrasonic waves that others can't hear, so it has great limitations in use.
196 1 Real wireless remote control
Real multifunctional wireless remote controller.
The remote control mentioned above can only adjust the volume and turn on and off the machine, and its function is very lacking.
Until 196 1 year, the idea of multifunctional remote control finally became a reality. RCA Victor Company from America produced the world's first wireless remote controller. Although this wireless remote control is shocking in appearance, it is as thick as a brick.
However, in terms of functions, it will never lose to some old remote control products, such as commonly used channel switching, sound size adjustment, color, brightness and other adjustment functions, which can be said to be the originator of remote control today.
A brief history of the development of TV remote control
The development stage of TV remote control in 1990s.
1950 The first wired remote controller was born.
1956 ultrasonic remote controller was born.
196 1 year, the real all-round wireless remote controller was born.
Next, let's take a look at the modern development history of remote control in the past 80 years. At this time, the remote control is close to the modern style products, and it is also the remote control that everyone contacts the most.
1980, low cost, which makes infrared remote control popular.
1980, when semiconductor devices for emitting and receiving infrared rays were developed, the infrared remote controller gradually replaced the ultrasonic control remote controller. Since then, the infrared remote controller was born.
Infrared remote control uses near infrared light to transmit remote control instructions with a wavelength of 0.76um~ 1.5um, and uses near infrared light as the remote control light source, because the peak wavelength of light emission and light reception of infrared emitting devices (infrared light emitting tubes) and infrared receiving devices (photodiodes, triodes, photovoltaic cells) is generally 0.8um~0.94um, and in the near infrared band, their spectra are just coincident, which can be very good.
The advantage of infrared remote control is also obvious, that is, the manufacturing cost is extremely low and it has been widely used so far.
However, in the subsequent gradual use, people gradually found that the traditional infrared remote controller has many shortcomings.
For example, with the TV screen gradually increasing, but the infrared receiving window is getting smaller and smaller, some new indoor lighting equipment and different TV installation methods will also interfere with the work of the infrared receiving window of the remote controller.
Therefore, in order to solve this problem, as a giant in the home appliance industry, Sony Corporation of Japan finally took action.
In 2007, Sony released the RF remote control.
In 2007, Sony took the lead in adopting a new type of RF remote controller in its BRAVIA series, which indicates that it will enter the wireless communication standard in the field of RF remote controllers in the future.
The RF remote controller not only changes the physical layer medium, but also changes the physical layer. The shape of the remote controller, the types of buttons and the types of controlled objects can be changed.
Sony TV released the world's first RF remote control. At that time, Sony TV came with two different remote controls, the new one on the left and the old one on the right.
So we also see that the shape of the remote control has changed from a traditional stick to a flat rectangle.
The reason why most infrared remote controllers are slender is that infrared rays need to point in the direction where the TV is located. The use of RF remote control directly transmits less radio waves and basically does not need to be directed at the TV.
Therefore, at present, most TV manufacturers have adopted the mainstream RF remote control technology.
3 working principle editing
The TV remote controller mainly relies on integrated circuits (also known as chips) to send instructions. The chip adopts 18 pin dual in-line package (DIP for short).
On the right side of the chip, you can see a diode, a transistor (black with three pins), a vibrator (yellow), two resistors (green) and a capacitor (dark blue).
There is also a resistor (green) and a capacitor (small brown disk) next to the battery contact. In this circuit, the chip can detect when the key is pressed.
Then, it encodes the key information in a form similar to Morse code, and the encoding of each key is different. The chip will send these signals to the transistor for amplification to enhance the signal.