What is the principle of fax machine?

Question 1: What is the fax principle of a fax machine? Its working principle is to use the Internet to send faxes, which can save telephone charges. It has three working modes: using IP address to send from fax machine to fax machine, using email address to send from fax machine to fax machine, and sending fax as email attachment.

What is the principle of fax machine?

Fax is the translation of fax, which means to copy and duplicate according to the original manuscript. Fax is a kind of communication means that the words, charts and images recorded on paper are scanned from the sender and then copied to the recording paper at the receiver. In other words, fax communication is actually a recording communication for transmitting still images, which some people call remote copying.

Fax communication is a communication method that uses fax machine, public communication network or other communication lines to transmit pictures, words and other information, and obtains a copy of the original system at the receiving end. Fax communication is an important part of modern image communication, and it is the only way to transmit and record original pictures and texts by using public telephone network at present, which is also an important reason for its wide application.

The basic idea of fax communication is Alexander, an Englishman? It was put forward by Alexander Bain in 1843, but it was not until 1925 that Bell Laboratories made the world's first fax machine by using electronic tubes and photoelectric control, which made the fax technology enter the practical stage. However, at that time, because fax machines were expensive and there was no unified international standard, fax communication needed to set up special communication lines, which developed slowly and its application was limited to a few fields such as news and meteorology.

Since the 1960s, with the economic development and scientific progress, the post and telecommunications departments in many countries have allowed public communication networks to open non-telephone services one after another, that is, to allow non-telephone services such as faxes to be communicated on the public telephone exchange network that was originally used only for voice communication. It laid a solid foundation for the development of fax communication, especially after 1986, CCITT successively formulated and issued a series of suggestions on the production and development of fax machines, which promoted the standardization of fax machine production and fax communication, thus making fax communication develop rapidly and become a means of communication second only to telephone.

So far, the actual fax machine has been upgraded twice. In 1960s and 1970s, the first and second generation fax machines were used, which were usually called Class I (G 1) fax machines and Class II (G2) fax machines respectively. At present, the third generation products and class III fax machines are widely used. Because the Type III fax machine adopts VLSI, advanced digital signal processing technology and computer control technology, it has the advantages of complete functions, fast transmission speed, small size, light weight, low power consumption and high reliability, so the Type III fax machine is the main fax machine type produced and applied in the world at present.

Because the three types of fax machines generally use the existing public switched telephone network to transmit signals, and the public switched telephone network is an analog channel, which requires modulation and demodulation to carry out fax communication, which makes the three types of fax machines suffer many restrictions in further improving communication speed and image and text quality. In order to further develop fax communication technology, many countries are currently studying and experimenting with new fax machines with ISDN as the transmission channel. That is, four types of fax machines, Japan and other countries have launched prototypes. The four types of fax machines have faster transmission speed and better image and text quality, and can transmit color images and texts. It can be seen that using four types of fax machines for fax communication has more attractive prospects.

Fax machines in China started earlier, but developed slowly. In 1990s, the fax machine market in China started, and the fax machine industry entered the take-off stage. The state lists fax machines as key industries and develops them in a coordinated way. In recent years, the national fax machine industry represented by diversity has developed very rapidly, and many kinds have entered the market, such as diversity DY-5M, diversity DY- 16T, diversity DY-80T and so on. Ink-jet plain paper fax machines are multi-DY- 100C (telephone, copy, fax, print and scan in one) and multi-DY-3100C for business confidentiality. The latest technology has been independently developed and applied to multiple fax machines, breaking the monopoly of foreign brand fax machines in China market, making the domestic fax machine market expand day by day, and gradually entering families, becoming the pioneer of fax machine industry in China, and promoting the development of communication terminals in China. & gt

Question 2: What is the principle of fax machine? The basic principle of fax machine mainly includes the following points:

1. image scanning: read the image points on the artwork by mechanical or electronic scanning equipment and convert them into digital format; It is also called photoelectric conversion, because it is only obtained by projecting the light source onto the artwork and scanning the reflected brightness of the scenic spot. The value of the image is binary 1 or 0, arranged by scan lines.

2. Compression coding: Scan line image data is compressed by compression coding to save data volume and transmission time.

3. Modulation: The compressed image data code is converted by the modulator into an audio analog signal that can be transmitted on the telephone line.

4. Telephone network transmission interface: send the modulated analog signal to the telephone transmission line for transmission, and then send it to the receiving end through the telecommunication switching network.

5. Telephone network receiving interface: receive the analog signal from the telephone loop and send it to the decoder.

6. Demodulation: Recover the audio analog signal into digital data code.

7. Decoding expansion: Decoding and expanding the compressed image digital data code back to the original scanning line image digital format.

8. Recording and printing: the digital data with binary value of 1 or 0 in one scan line is sent to the printing equipment and displayed on the recording paper with black and white ink, and the scan lines of the manuscript have the same scale and resolution.

2. There are two common image scanning devices: charge coupled device CDD and contact image sensor CIS, which are also commonly used in copiers, optical scanners (bar code reading, handheld and desktop scanners) and cameras. Common recording and printing devices are thermal print head (TPH) and laser printer. Modems usually use modem chips that have been made into large integrated circuits, similar to data communication applications on computers. Network Control Unit (NCU) is usually used for telephones and other communication terminal equipment. Data compression/expansion usually uses a large-scale integrated circuit chip, and the operation processing of data compression, coding or decoding expansion is completed by this chip.

Three, manual receiving or feeding (receiving/polling)

ON: After selecting the phone and answering manually, you know that the other party wants to send/receive, and then press the start button to start receiving/sending.

Off: Select fax machine and fax machine to automatically receive or send after answering.

Because many fax machine users have a telephone number and a fax machine number, they hope to use the telephone mainly when someone is around. If the other party wants to fax data, they will temporarily press the start button to start the fax machine to receive it, otherwise it will be set to automatic reception. After waiting for an appointment, the fax machine will automatically answer it (the answering tone of the machine is 2 100Hz for 3 seconds) and then perform the receiving function. Unless the receiver quickly picks up the receiver and presses the stop button of the fax machine again, and the caller has not hung up, there is still a chance to talk, so many calls are often answered by mistake. Of course, the fax machine occupies a telephone number as a fax line and is set to receive automatically, so there will be no telephone/fax confusion. Many techniques have been developed to distinguish when telephone numbers are used by fax machines and telephones. This paper introduces several common functions.

1. Timing switch: Set the service cycle of fax machine/telephone, and switch manual on/off regularly every day. For example, the fax machine will arrive at 18:00.

At 07:00, the fax machine will automatically switch according to the following time:

18:00 (automatic) -07:00 fax machine.

07:00(MAUAL)- 18:00, mainly by telephone.

2. Identification switch: When an outside line comes in, the phone starts to vibrate. The identification switch turns on the fax machine/phone first, and then identifies whether the other party (caller) has a fax machine call (machine voice, 1 100Hz). Repeat for 0.5 seconds and silence for 3 seconds. If so, the telephone line is switched to communicate with the fax machine, and ringing is generated to continue the automatic receiving function of the fax machine. Otherwise, switching the telephone line and telephone communication will cause ringing to urge people to answer the phone. In addition, in order to improve the reliability of recognition and reduce errors, some recognition cutters add short voice response or make short initial response of fax machine for recognition, which will certainly consume some telephone time, and the recognition switch has been purchased and installed additionally ... >; & gt

Question 3: What is the principle of fax? The working principle of fax machine is actually relatively simple. Firstly, the documents to be faxed are converted into digital signals in huffman encoding mode by photoelectric scanning technology, then converted into audio signals by V.27 and V.29 modulation, and then transmitted through traditional telephone lines. After receiving the signal, the receiver's fax machine will recover the signal and print it out, so that the receiver will receive a copy of the original document. To sum up, when sending: scan the picture-> Generate data signal->; Digital information compression->; Modulated into an analog signal-&; Gt when sending and receiving signals to the telephone network: receiving analog signals from the telephone network->; Demodulate into digital signal->; Decompress the digital signal into an initial image signal->; Print.

Question 4: What is the principle of fax? Although the fax machine is a communication tool that has been widely used in recent 20 years, its invention idea was formed 50 years ago. According to relevant data, as early as May 27th, 1843, the principle of fax machine was patented, which was 30 years earlier than the telephone patent.

Different types of fax machines have different printing methods after receiving signals, and their working principles in these aspects are basically different.

At present, the common fax machines in the market can be divided into four categories:

1, thermal paper fax machine (also known as network fax machine);

2. Thermal transfer plain paper fax machine;

3. Laser plain paper fax machine (also called laser all-in-one machine);

4. Ink-jet plain paper fax machine (also known as ink-jet integrated machine).

The most common ones on the market are thermal paper fax machines and inkjet/laser all-in-one machines.

The thermal paper fax machine melts and discolors the thermal materials on the printing medium through the thermal print head to generate the required characters and graphics. Thermal transfer printing is developed from thermal technology. By adding a thermal transfer ribbon, the ink coated on the ribbon is transferred to paper to form an image. Thermal printing is used in the most common fax machines.

The working principle of inkjet fax machine is similar to dot matrix printing. The inkjet head is driven by a stepping motor to move left and right, and the ink sprayed by the inkjet head is sprayed on ordinary paper in turn to complete the printing work.

Laser plain paper fax machine is a kind of fax machine that uses toner to attach to paper and images. Its working principle is mainly to use a selenium drum in the body to control the laser beam. By controlling the turn-on and turn-off of the laser beam, a charged image area is generated in the selenium drum. At this time, the toner in the fax machine will be attracted by the charge and attached to the paper to form words or images.

Working principle:

The working principle of fax machine is very simple, that is, the document to be sent is scanned and converted into a series of black and white dot information, and then converted into audio signals, which are transmitted through traditional telephone lines. After receiving the signal, the receiver's fax machine will print out the corresponding point information, so that the receiver will receive a copy of the original. However, the four fax machines have different printing methods after receiving signals, and their working principles in these aspects are basically different.

In other words: firstly, the documents that need to be faxed are converted into huffman encoding digital signals by photoelectric scanning technology, then converted into audio signals by V.27 and V.29 modulation, and then transmitted through traditional telephone lines. After receiving the signal, the receiver's fax machine will recover the signal and print it out, so that the receiver will receive a copy of the original document.

To sum up:

When sending: scan image-> generate data signal->; Compression of digital information->; Modulated into analog signal->; Send it to the telephone network for transmission.

When receiving: receive analog signals from the telephone network->; Demodulate into digital signal->; Decompress a digital signal into an initial image signal.

The thermal paper fax machine melts and discolors the thermal materials on the printing medium through the thermal print head to generate the required characters and graphics. Thermal transfer printing is developed from thermal technology. By adding a thermal transfer ribbon, the ink coated on the ribbon is transferred to paper to form an image. Thermal printing is used in the most common fax machines. Laser plain paper fax machine is a kind of fax machine that uses toner to attach to paper and images. Its working principle is mainly to use a selenium drum in the body to control the laser beam. By controlling the on and off of the laser beam, a charged image area is generated in the selenium drum. At this time, the toner in the fax machine will be attracted by the charge and attached to the paper to form words or images. The working principle of inkjet fax machine is similar to dot matrix printing. The inkjet head is driven by a stepping motor to move left and right, and the ink sprayed by the inkjet head is sprayed on ordinary paper in turn to complete the printing work.

Advantages and disadvantages comparison:

Among the four types of fax machines, thermal paper fax machines and inkjet/laser integrated machines are the most common, while the difference between laser integrated machines and inkjet integrated machines is only the printing method and consumables used. So it can be basically divided into two camps for comparison, one is thermal paper fax machine, and the other is inkjet/laser all-in-one machine. ......& gt& gt

Question 5: What is the working principle of the fax machine? Working principle of fax machine: The basic working principle of fax machine is to use photoelectric scanning technology to convert images and characters into digital signals of huffman encoding, which are modulated by V.27 and V.29 and then transmitted on analog channels according to T.30 protocol. Because of the different communication protocols and signal formats, fax machines cannot transmit information directly on the Internet. In order to transmit the signals sent by fax machines connected to PSTN on the Internet, the basic principle is to establish a gateway between PSTN and the Internet, and the protocol conversion is carried out by the gateway, so that the fax signals of PSTN and the data packets of the Internet can be mutually converted.

Question 6: What is the specific principle of data transmission by fax machine? It is a communication device that uses scanning and photoelectric conversion technology to convert still images such as files, charts and photos into electrical signals and transmit them to the receiving end in the form of records for copying.

The working principle of fax machine is very simple, that is, the document to be sent is scanned and converted into a series of black and white dot information, and then converted into audio signals, which are transmitted through traditional telephone lines. After receiving the signal, the receiver's fax machine will print out the corresponding point information, so that the receiver will receive a copy of the original. However, the four fax machines have different printing effects after receiving the signal.

(1) The thermal paper fax machine melts and discolors the thermal materials on the printing medium through the thermal print head to generate the required text and graphics.

(2) The thermal transfer fax machine is developed from thermal sensitive technology. By adding a thermal transfer ribbon, the ink coated on the ribbon is transferred to paper to form an image.

(3) Laser fax machine is a kind of fax machine that uses toner to attach to paper for imaging. Its working principle is mainly to use a selenium drum in the body to control the laser beam. By controlling the on and off of the laser beam, a charged image area is generated in the selenium drum. At this time, the toner in the fax machine will be attracted by the charge and attached to the paper to form words or images.

(4) The working principle of inkjet fax machine is similar to dot matrix printing. The inkjet head is driven by a stepping motor to move left and right, and the ink sprayed by the inkjet head is sprayed on ordinary paper in turn to complete the printing work.

Question 7: The working principle of fax machine As an information transmission tool, the working principle of fax machine is convenient, fast and accurate, and the communication cost is low.

An indispensable communication tool for enterprises and institutions. With the postal and telecommunications departments completely canceling the initial installation fee and monthly fee for fax machines,

With the sharp drop in the price of fax machines, fax machines began to enter the home. Fax machine is a kind of electromechanical communication equipment.

The mechanical part of letter equipment is mainly the paper feeding mechanism of fax machine, but this paper mainly discusses the work of the circuit part of fax machine.

Principle. Fax machine is mainly composed of main control circuit, fax image input mechanism, fax image output mechanism, modulation and demodulation circuit,

The operation panel and power supply are as shown in the figure ... 1. The components of the fax machine will be further introduced below. First, the main control circuit, like the host, controls the working mode and state of the fax machine. The main control circuit includes 16.

Bit (or 8-bit) CPU, program read-only memory, data random access memory, RAM, address decoder and transmission.

Control circuit composition. The control contents of the main control circuit mainly include fax sending operation, fax receiving operation and fax sending operation.

Includes fax image scanning input, image data transmission, image data processing and modulation output; Receiving fax operation

Includes receiving, demodulating, storing and outputting fax signals. When the fax machine works, the main control circuit reads the program from rom.

Ok, the data is stored in ... Ram. The transmission control circuit consists of programmable .. io interface and programmable DMA controller, and its main function is to cooperate with the main control power supply.

Road to complete the signal transmission. Second, the fax image input mechanism The fax image input mechanism is like a scanner, which scans the fax manuscript under the control of the signal sent by the main control circuit.

Trajectory input and image data processing. The fax input mechanism consists of a fax manuscript input and transmission mechanism, a photoelectric image sensor, an analog signal processor and an A/D.

Converter, gray scale correction circuit, gate array, binary and halftone .. ROM and memory, as shown in the figure .. 2. The transmission mechanism of fax manuscript input consists of fax manuscript photoelectric detector and paper feeding stepping motor. When sending a fax,

The fax manuscript enters from the transmission mechanism, and the photoelectric image sensor converts the image signal on the fax manuscript into an analog electrical signal.

Send it to the analog signal processor for processing. The processed analog electric signal is sent to .. A/D converter to convert it into digital signal and send it to.

The gate array is output under the control of effective row processing signal and read processing signal sent by the main control circuit. Because of the nonlinearity of the image sensor, the A/D converter can't directly input the image information.

The output image information is the information read in ROM according to the output digital signal ... Analog-to-digital converter. This image

The information is compressed and encoded and sent to the modulator for modulating the output. At present, the photoelectric image sensors used in popular fax machines are mostly contact .. CIS (Contact Image Sensor) sensors. The photoelectric image sensor used by some fax machines is CCD (Charge Coupled Device).

Device) charge coupler. Gray scale and image resolution, two important parameters of fax machine, mainly depend on the performance of photoelectric image sensor.

These two types of sensors are commonly used in copiers, bar codes, scanners and cameras.

Third, the fax image output mechanism.

The fax image output mechanism is like a printer, which completes the printing and output of the received fax manuscript. Some fax machines have parallel interfaces, which can output fax images to computers or printers. Fax image output circuit usually consists of single chip microcomputer, extended input and output interface, analog-to-digital converter and memory.

To receive the fax image output from the demodulator. Fax image output mechanism is divided according to printing principle, with thermal printing.

Printing, inkjet printing, laser printing and .. LED printing, etc. At present, most popular fax machines use thermal printing,

Just need to use more expensive thermal paper; Ink jet printing and laser printing have exactly the same working principle as the corresponding printers.

Real machine inkjet printing mode is easy to realize color output; LED printing is similar to laser printing, but it is omitted.

Complex optical paths and circuits such as laser, laser lens group and polygon rotating mirror are designed, and a row of light emitting diodes are used closely.

Sticking to the photosensitive drum for imaging reduces the cost. Fourth, the modulation and demodulation circuit

The modem circuit is like a modem, which completes the modulation, transmission, reception and demodulation of fax information and line switching.

The modulation and demodulation circuit consists of modulator, demodulator and line interface control circuit.

The line interface control circuit is the lack of connection between the telephone and the fax machine. & gt

Question 8: What does fax mean? Fax, English name is fax.

Working principle of fax machine: The working principle of fax machine is very simple, that is, the documents to be sent are scanned and converted into a series of black and white dot information, and then converted into audio signals, which are transmitted through traditional telephone lines. After receiving the signal, the receiver's fax machine will print out the corresponding point information, so that the receiver will receive a copy of the original. However, the printed effect of this fax machine after receiving the signal is different, and their working principles are basically different in these aspects.

Practical operation of fax machine: you can read the instructions. Simply put, you just need to insert the written article or a document into the file input port of the fax machine, dial the fax number of the other party, and press the "Start" button (some of them are "Send") after the other party replies, and it's done!

Question 9: What is the principle that the paper outlet side of fax machine is the same as that of printer and copier? Fax machine: First, scan the contents of a paper document. After scanning, you can convert the contents of this paper document into electronic signals, and then transmit these electronic signals to another fax machine through the communication medium. This fax machine then reversely converts these electrical signals into previous images and prints them on paper.

Question 10: What is a fax and how to send it? Fax machine is one of the most common office supplies.

Fax step

1

The first thing is to put the contents to be faxed into the fax machine. Of course, before you come here, you should open the lid and put the manuscript to be faxed in the fax machine. The fax machine sucks the manuscript to a distance of several millimeters, indicating that the manuscript has been inserted successfully.

2

Prompt the receiver of the fax machine or press the hands-free key to dial the other party's phone number.

three

Wait for the fax machine to answer automatically and send out a "beep ~ ~ ~" fax signal. At this point, press the "Fax/Start" button and the fax will be sent automatically.

four

After dialing, hear the sound of "Didi-",and then press the "Fax/Start" key.