A telephone is a communication device commonly used in our lives. It is a terminal device that transmits voice bidirectionally through electrical signals. Telephone communication is a communication technology that converts sound energy and electrical energy, and uses the medium of "electricity" to transmit language. . Telephones are mainly divided into three types: wired telephones, wireless telephones and smart phones.
Introduction to Telephone
Telephone English: APLLE, from the Greek τῆλε (tēle, meaning "far") and φωνή (phōnē, meaning "sound"), the old translation telephone] is a long-distance communication device that can transmit and receive sound. As early as the 18th century in Europe, the word "telephone" was used to refer to a microphone that was strung with a line (a cup with a string). The emergence of the telephone is attributed to Alexander Graham Bell. The principle of the early telephone is that the voice of speech is a compound vibration in the air, which can be transmitted to a solid body, and is transmitted to a conductive metal by an electric pulse. Bell patented the telephone in March 1876.
U.S. Congress Resolution 269 of June 15, 2002, recognized Antonio Muzzi as the inventor of the telephone. Muzzi first showed his invention to the public in 1860 and published an introduction to it in an Italian-language newspaper in New York.
The improvements and inventions of telephones in history include: toner microphones, manual switching boards, dials, automatic telephone exchanges, program-controlled telephone exchanges, dual-tone multi-frequency dialing, voice digital sampling, etc. New technologies in recent years include, ISDN, DSL, Internet telephony, analog mobile phones and digital mobile phones.
The industry is generally divided into telephone equipment manufacturers and telephone network operators. Historically, network operators have often had national monopolies. In recent years, with the opening and integration of the global telecommunication market and the development of technology, a situation in which multiple operators are competing in the same market has gradually emerged. For example, Bell Systems, a subsidiary of AT&T, once owned 80 percent of the U.S. telephone market. In 1984, the Bell System was forced to partition into separate local Bell companies as a result of an antitrust lawsuit by the U.S. Department of Justice. There is a saying that can explain this phenomenon: Before AT&T was not divided, IBM was the second largest company in the United States. After AT&T was divided into seven companies, IBM's ranking became eighth.
The basic structure of the telephone
A telephone is a terminal device that transmits voice bidirectionally through electrical signals.
The improvements and inventions of telephones in history include: toner microphones, telephone manual exchange boards, dials, automatic telephone exchanges, program-controlled telephone exchanges, dual-tone multi-frequency dialing, voice digital sampling, etc. New technologies include, ISDN, DSL, analog mobile phones and digital mobile phones.
Basic keys
Telephone power cord, telephone line, take-up switch, receiver, booster button, microphone, local number chip, ringtone and speakerphone, memory code key, memory number chip, number keys, memory retrieval key, memory storage key , redial key, working indicator light, hands-free key, R key, hands-free microphone, ringtone adjustment switch, P/T switch, hands-free receiving volume adjustment knob.
How the telephone works
Telephone communication is a communication technology that converts sound energy and electrical energy, and uses the medium of "electricity" to transmit language. The simplest form for two users to communicate is to connect two telephones with a pair of lines.
1. When the speaker picks up the telephone and speaks into the microphone, the vibration of the vocal cords excites the air to vibrate, forming sound waves.
2. The sound wave acts on the microphone to generate a current, which is called voice current.
3. The voice current is transmitted along the line to the receiver of the other party's telephone.
4. The function of the receiver is just the opposite of that of the transmitter - the current is converted into sound waves and transmitted to the human ear through the air.
Basic functions of the telephone
The telephone is set on the user side of the origin and destination of telephone communication, and is the user terminal equipment of the telephone network. Modern telephones can easily realize calls and conversations between end users, which have been formed through many people's researches and countless improvements over a hundred years. Although their styles vary widely, they generally have the following basic functions:
1. Sound and electricity exchange
Because to carry out fast and long-distance communication, it is not possible to transmit sound directly, but must first convert the sound into an electrical signal (that is, use electricity as a carrier), and then restore the electrical signal to sound after reaching the other party.
2. Off-hook identification
When the calling party picks up the phone, the switch should have the ability to know "someone wants to call", so that the switch is ready for connection.
3. Send a signal
It is by sending dial signals that automatic telephones direct the work of the telephone exchange, and then establish a connection between two telephones.
4. The bell
That is, when the other party calls, the phone can tell the owner by ringing: "Someone is calling."
5. Electrical connection
In the telephone, the components that realize these five functions are: the handset, the hook switch, the dial (or the keyboard), the telephone ring and the telephone loop.
Telephone classification
1. Wired telephone
The telephone has the function of converting the sound wave of the terminal into an electronic signal, and transmitting it to the remote party through the telephone line. Functions such as the signal (dial pulse) selected in the call to inform the other party. The telephone is composed of a transmitter that converts voice into electric current and sends it to the telephone line, a receiver that restores the current sent by the other party to voice, a dial or button to call the other party, a ringtone that sends a calling tone, and performs these connections on the telephone line. Its function is composed of line network and so on. Inside the phone is a small box filled with carbon particles, with a thin duralumin vibrating plate in front of it. The vibrating plate vibrates according to the voice, vibrating the carbon particles, and the carbon particles conduct electric current. With the contact degree of the particles, the resistance changes and the voice current is generated. After the receiver receives the voice current of the other party, a magnetic force caused by the voice current is generated on the coil, and the iron vibrating plate vibrates to make a sound.
2. Wireless phone
Wireless Loop - Cordless Telephone Telephone Sub-Master Digital Cordless Telephone
analog cordless phone
mobile phone
PHS (wireless phone)
3. Smartphone
With the continuous and rapid development of IT technology, the processing capability of embedded terminal equipment is getting stronger and stronger. At the beginning of this century, a telephone "smart phone" with a personal data assistant (PDA) appeared.
In addition to the complete fixed telephone functions, smart phones usually have large-capacity business card management functions, incoming and outgoing call management functions, telephone harassment prevention (telephone firewall) functions, enterprise group telephone business cards (internal business cards) management functions, and auxiliary office functions. many functions, such as: scheduling, notes, calendar, calculator and other functions. Early smart phones had certain information exchange capabilities through dial-up Internet access, and realized the functions of sending short messages and receiving text messages. With the development of fixed-line smart phones in China in the past ten years, their processing capabilities have been strengthened, and the functions of smart phones have gradually increased.
Smart phones have the ability to access the Internet through the Internet and strong multimedia functions. It can browse the Internet, play audio and video, and have functions such as e-books and electronic photo frames. At the same time, the functions of smart phones in auxiliary office, auxiliary marketing and entertainment have also been greatly strengthened. On the basis of subverting the traditional fixed telephone, more business functions and PDA functions have been realized.
Telephone purchase
1. Appearance
The plastic shell is smooth and clean, and the craftsmanship is exquisite. Each button part feels good, and there should be no bounce or slow bounce.
2. Sound
After the newly purchased telephone is connected to the line, it should be checked whether the ringing is clear, whether the speaking and receiving are clear and loud, and there should be no sharp whistling or equipment noise in the receiver.
3. Functional inspection
For telephones with multiple functions, hands-free phones, recording phones, cordless phones, etc., they should also be checked item by item, telephone buttons, hands-free performance, charging instruction light display, recording, playback and enhancement, storage redial, pause Whether the function is complete and effective.
In some areas with interference, new users need to buy anti-interference telephones to avoid unnecessary troubles.
Phone Maintenance
1. The telephone should be kept clean. If there is dust, it can be wiped with clean ethanol cotton, which not only removes the contamination on the telephone, but also plays a role in disinfection. Avoid scrubbing with chemicals such as detergent powder, soap powder, gasoline, kerosene, banana water, and do not scrub with hot water or chemical wipes.
2. When talking, do not twist the soft rope with your hands to prolong the service life of the soft rope.
3. There are dry batteries or small button batteries in the push-button telephone, which should be replaced in time to prevent the leakage of chemical liquid in the battery from damaging the parts.
4. Do not open the body at will or touch the inside of the phone with your hands. If the user opens the phone by himself, even if it is within the warranty period, the repair fee will still be charged.
5. Do not change the switch position arbitrarily. If the user finds that the number is not issued, please pay attention to whether the valley/peak switch on the telephone is correct. If the bell does not ring or the bell is light, pay attention to whether the bell switch is in place. The ringing of the phone is on (ON) for normal use, and off (off) is when the person leaves or does not want the phone to ring. But don't forget to recover. The high (high) ring is louder, and the low (low) ring is less loud. If the voice of the other party is soft, you can turn the volume switch of the incoming call to the "high" position, or adjust the volume potentiometer to the appropriate position.
6. If the telephone fails during use, please notify the obstacle station (112) of the local telephone office to assist in the test and inspection, and do not disassemble and repair the telephone by yourself, so as not to damage the telephone parts and lines and cause unnecessary economic losses.
telephone brand
EAST LINE is a professional manufacturer of fixed telephones and wireless card telephones in China. Welcome to consult and understand.
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