Modified reading (MR) (also known as CCITT Group 3 fax code or CCITT T.4) and modified reading (MMR) (also known as CCITT Group 4 fax code or CCITT T.6). There are many types of faxes, including 1.
Level 2 and Intel CAS. Fax machines use various telephone line modulation technologies. Handshake when connecting the modem determines that the fax machine will use the highest transmission speed supported by both parties, usually the lowest is14.4kbit/s ... ITU standard announces data transmission rate (bit/s) coding method V.27 1988 4800.
2400 PSK v. 29 1988 9600
7200
4800 QAM v . 17 199 1 14400
12000
9600
Thermal printer technology is usually used in fax machines from 7200 TCM v.341994 28800 QAM1970 to 1990, but from the middle of 1990, it gradually turned to thermal transfer and inkjet printing technology as the mainstream. One of the advantages of inkjet printing is that it can print color documents at a reasonable price. So many inkjet fax machines claim to have color fax function. Color fax has been called ITU-T30e standard, but this technology has not been widely supported. Most color fax machines can only transmit color documents with the same brand fax machines. [Editor] The modern substitute of fax machine is to send computer image files as attachments by e-mail. In this way, color images can be transmitted and higher resolution can be enjoyed. Please refer to Internet fax. There have been many studies to enable the receiver to process the received fax more effectively. Nowadays, digital storage is much cheaper than that in 1960s+0970s. However, junk fax has become a common problem and caused a lot of paper waste. Some more expensive communication servers don't print the received faxes immediately, but send them to mailboxes and store and forward them in other ways, such as e-mail or voice mail. See Unified Messaging. [Editor] Alexander Bain, a Scottish inventor, obtained a patent at 1843, which is considered to be related to the appearance of the fax machine. He used his knowledge of electric clocks and pendulums to make the first progressive scanning mechanism from front to back. 186 1 year, the first fax machine, Pantelegraph, was sold by Giovanni Casell before the telephone was officially invented. 1924, Richard H. Ranger, the designer of RCA, invented the wireless photoelectric fax machine, which is the predecessor of today's fax machine. A photo of President John Calvin Coolidge of the United States was transmitted from new york to London on1October 29th, 1924+ 165438, which became the first image transmitted by radio fax technology and put into commercial use two years later. Radio fax is still used to transmit weather images and information today. An early fax method, Hellschreiber, was invented by Rudolf Hull in 1929, and was the pioneer of mechanical image scanning and transmission at that time. From 65438 to 0985, Dr. Hank Magnuski, the founder of GammaLink, made the first computer fax expansion card GammaFax.
The historical fax machine of fax machine is actually a combination of image scanner, modem and computer printer. The scanner converts the document contents into digital images, the modem transmits the image data through telephone lines, and the printer at the other end converts the images into copies of the original documents. A fax machine with special functions can be connected to a computer, scan files into the computer, and print computer files into files. This kind of equipment is called multi-function printer, which is generally more expensive than fax machine. Modern fax technology will not enter the practical stage until the middle of 1970' s, when the above three technologies have made enough progress and reasonable cost. Fax machine was first popular in Japan because it has obvious advantages over other similar technologies such as teletypewriter. At that time, because there was no easy input method tool, handwritten Chinese characters were more convenient than keyboard input. The cost of fax machines gradually became affordable, and by the mid-1980s, fax machines had spread all over the world. Today, although most commercial organizations still use fax machines, fax technology is out of date in this Internet age. The [Edit] function fax machine uses black-and-white (black-and-white) mode, and can transmit one or more printed or handwritten documents with the resolution of 100x200 or 200x200dpi every minute. The transmission rate is above 14.4kbit/s (kilobits per second), and the fax machine supports the rate from 2400 bit/s. This image transmission format is called ITU-T (formerly CCITT) fax group 3 or 4. The most basic fax mode can only transmit black and white images. An A4-sized document is scanned with each line of 1728 pixels and each page of 1 145 lines. The obtained data will be compressed by huffman encoding technology optimized for handwritten characters, and the compression rate of 20 copies can reach 1. At the rate of 9600 bit/s, 1728× 1 145 bits per page, the average transmission takes 10 second, while the uncompressed data transmission takes 3 minutes. Compression technology uses Huffman codebook to encode the black and white length of each scan line, and because two adjacent scan lines are usually very similar, only the difference is encoded to save bandwidth. Coding techniques used to transmit faxes include: Modified Huffman (MH).
Modified reading (MR) (also known as CCITT Group 3 fax code or CCITT T.4) and modified reading (MMR) (also known as CCITT Group 4 fax code or CCITT T.6). There are many types of faxes, including 1.
Level 2 and Intel CAS. Fax machines use various telephone line modulation technologies. Handshake when connecting the modem determines that the fax machine will use the highest transmission speed supported by both parties, usually the lowest is14.4kbit/s ... ITU standard announces data transmission rate (bit/s) coding method V.27 1988 4800.
2400 PSK v. 29 1988 9600
7200
4800 QAM v . 17 199 1 14400
12000
9600
Thermal printer technology is usually used in fax machines from 7200 TCM v.341994 28800 QAM1970 to 1990, but since the middle of 1990, thermal transfer and inkjet printing technology have gradually become the mainstream. One of the advantages of inkjet printing is that it can print color documents at a reasonable price. So many inkjet fax machines claim to have color fax function. Color fax has been called ITU-T30e standard, but this technology has not been widely supported. Most color fax machines can only transmit color documents with the same brand fax machines. [Editor] The modern substitute of fax machine is to send computer image files as attachments by e-mail. In this way, color images can be transmitted and higher resolution can be enjoyed. Please refer to Internet fax. There have been many studies to enable the receiver to process the received fax more effectively. Nowadays, digital storage is much cheaper than that in 1960s+0970s. However, junk fax has become a common problem and caused a lot of paper waste. Some more expensive communication servers don't print the received faxes immediately, but send them to mailboxes and store and forward them in other ways, such as e-mail or voice mail. See Unified Messaging. [Editor] Alexander Bain, a Scottish inventor, obtained a patent at 1843, which is considered to be related to the appearance of the fax machine. He used his knowledge of electric clocks and pendulums to make the first progressive scanning mechanism from front to back. 186 1 year, the first fax machine, Pantelegraph, was sold by Giovanni Casell before the telephone was officially invented. 1924, Richard H. Ranger, the designer of RCA, invented the wireless photoelectric fax machine, which is the predecessor of today's fax machine. A photo of President John Calvin Coolidge of the United States was transmitted from new york to London on1October 29th, 1924+ 165438, which became the first image transmitted by radio fax technology and put into commercial use two years later. Radio fax is still used to transmit weather images and information today. An early fax method, Hellschreiber, was invented by Rudolf Hull in 1929, and was the pioneer of mechanical image scanning and transmission at that time. From 65438 to 0985, Dr. Hank Magnuski, the founder of GammaLink, made the first computer fax expansion card GammaFax. Before e-mail became popular, fax had the following advantages: 1. Fax is faster than mail. 2. It can ensure that the receiver can receive the information. 3. The sender does not need to print a lot of duplicate information. With the rise of e-mail, fax has become very obvious. 1. Fax needs to occupy a telephone line, that is, you can't talk and fax in language on the same telephone line at the same time. 2. Because most fax machines only use thermal printing technology, the printing quality is low. Most faxes can only be sent and received one to one. Most faxes can't preview the content, but e-mail can. 5. Fax can only be in black and white; Although there is color fax technology now, there is no open and unified standard. 6. Fax costs (especially in order to solve some fax problems, extra equipment is needed)
Reference: * * *, myself
Fax (short fax) (fax-originally from Latin "facsimile", "similar to manufacturing") is a telecommunication technology used to transmit copies of documents, using affordable equipment and telephone networks. Overview Fax machine is actually a combination of image scanner, modem and computer printer. The scanner converts the document contents into digital images, the modem transmits the image data through telephone lines, and the printer at the other end converts the images into copies of the original documents. A fax machine with special functions can be connected to a computer, scan files into the computer, and print computer files into files. This kind of equipment is called multi-function printer, which is generally more expensive than fax machine. Modern fax technology will not enter the practical stage until the middle of 1970' s, when the above three technologies have made enough progress and reasonable cost. Fax machine was first popular in Japan because it has obvious advantages over other similar technologies such as teletypewriter. At that time, because there was no easy input method tool, handwritten Chinese characters were more convenient than keyboard input. The cost of fax machines gradually became affordable, and by the mid-1980s, fax machines had spread all over the world. Today, although most commercial organizations still use fax machines, fax technology is out of date in this Internet age. The function fax machine uses two-tone mode, and can transmit one or more printed or handwritten documents per minute with the resolution of 100x200 or 200x200dpi. The transmission rate is above 14.4kbit/s (kilobits per second), and the fax machine supports the rate from 2400 bit/s. This image transmission format is called ITU-T (formerly CCITT) fax group 3 or 4. The most basic fax mode can only transmit black and white images. An A4-sized document is scanned with each line of 1728 pixels and each page of 1 145 lines. The obtained data will be compressed by huffman encoding technology optimized for handwritten characters, and the compression rate of 20 copies can reach 1. At the rate of 9600 bit/s, 1728× 1 145 bits per page, the average transmission takes 10 second, while the uncompressed data transmission takes 3 minutes. Compression technology uses Huffman codebook to encode the black and white length of each scan line, and because two adjacent scan lines are usually very similar, only the difference is encoded to save bandwidth. Coding techniques used to transmit faxes include: Modified Huffman (MH).
Modified reading (MR) (also known as CCITT Group 3 fax code or CCITT T.4) and modified reading (MMR) (also known as CCITT Group 4 fax code or CCITT T.6). There are many types of faxes, including 1.
Level 2 and Intel CAS. Fax machines use various telephone line modulation technologies. Handshake when connecting the modem determines that the fax machine will use the highest transmission speed supported by both parties, usually the lowest is14.4kbit/s ... ITU standard announces data transmission rate (bit/s) coding method V.27 1988 4800.
2400 PSK v. 29 1988 9600
7200
4800 QAM v . 17 199 1 14400
12000
9600
Thermal printer technology is usually used in fax machines from 7200 TCM v.341994 28800 QAM1970 to 1990, but since the middle of 1990, thermal transfer and inkjet printing technology have gradually become the mainstream. One of the advantages of inkjet printing is that it can print color documents at a reasonable price. So many inkjet fax machines claim to have color fax function. Color fax has been called ITU-T30e standard, but this technology has not been widely supported. Most color fax machines can only transmit color documents with the same brand fax machines. Alexander Bain, a Scottish inventor, obtained a patent at 1843, which is considered to be related to the appearance of fax machines. He used his knowledge of electric clocks and pendulums to make the first progressive scanning mechanism from front to back. 186 1 year, the first fax machine, Pantelegraph, was sold by Giovanni Casell before the telephone was officially invented. 1924, Richard H. Ranger, the designer of RCA, invented the wireless photoelectric fax machine, which is the predecessor of today's fax machine. A photo of President John Calvin Coolidge of the United States was transmitted from new york to London on1October 29th, 1924+ 165438, which became the first image transmitted by radio fax technology and put into commercial use two years later. Radio fax is still used to transmit weather images and information today. An early fax method, Hellschreiber, was invented by Rudolf Hull in 1929, and was the pioneer of mechanical image scanning and transmission at that time. From 65438 to 0985, Dr. Hank Magnuski, the founder of GammaLink, made the first computer fax expansion card GammaFax. Advantages: you can send pictures and words to the other party quickly, saving time and not being limited by region. Sometimes the fax machine can't send information 100% accurately, which may be due to the problem of paper and the color may be different, which makes people make mistakes in understanding.
I can't even understand it. Moreover, if thermal paper is used, the data cannot be stored for a long time.
Reference: zh. *** /w/index？ Title =% E5% 82% B3% E7% 9c% 9f% E6% A9% 9f&; Variant =zh-
Fax machine is actually a combination of image scanner, modem and computer printer. The scanner converts the document contents into digital images, the modem transmits the image data through telephone lines, and the printer at the other end converts the images into copies of the original documents. A fax machine with special functions can be connected to a computer, scan files into the computer, and print computer files into files. This kind of equipment is called multi-function printer, which is generally more expensive than fax machine. Modern fax technology will not enter the practical stage until the middle of 1970' s, when the above three technologies have made enough progress and reasonable cost. Fax machine was first popular in Japan because it has obvious advantages over other similar technologies such as teletypewriter. At that time, because there was no easy input method tool, handwritten Chinese characters were more convenient than keyboard input. The cost of fax machines gradually became affordable, and by the mid-1980s, fax machines had spread all over the world. Today, although most commercial organizations still use fax machines, fax technology is out of date in this Internet age. The [Edit] function fax machine uses black-and-white (black-and-white) mode, and can transmit one or more printed or handwritten documents with the resolution of 100x200 or 200x200dpi every minute. The transmission rate is above 14.4kbit/s (kilobits per second), and the fax machine supports the rate from 2400 bit/s. This image transmission format is called ITU-T (formerly CCITT) fax group 3 or 4. The most basic fax mode can only transmit black and white images. An A4-sized document is scanned with each line of 1728 pixels and each page of 1 145 lines. The obtained data will be compressed by huffman encoding technology optimized for handwritten characters, and the compression rate of 20 copies can reach 1. At the rate of 9600 bit/s, 1728× 1 145 bits per page, the average transmission takes 10 second, while the uncompressed data transmission takes 3 minutes. Compression technology uses Huffman codebook to encode the black and white length of each scan line, and because two adjacent scan lines are usually very similar, only the difference is encoded to save bandwidth. Coding techniques used to transmit faxes include: Modified Huffman (MH).
Modified reading (MR) (also known as CCITT Group 3 fax code or CCITT T.4) and modified reading (MMR) (also known as CCITT Group 4 fax code or CCITT T.6). There are many types of faxes, including 1.
Level 2 and Intel CAS. Fax machines use various telephone line modulation technologies. Handshake when connecting the modem determines that the fax machine will use the highest transmission speed supported by both parties, usually the lowest is14.4kbit/s ... ITU standard announces data transmission rate (bit/s) coding method V.27 1988 4800.
2400 PSK v. 29 1988 9600
7200
4800 QAM v . 17 199 1 14400
12000
9600
Thermal printer technology is usually used in fax machines from 7200 TCM v.341994 28800 QAM1970 to 1990, but since the middle of 1990, thermal transfer and inkjet printing technology have gradually become the mainstream. One of the advantages of inkjet printing is that it can print color documents at a reasonable price. So many inkjet fax machines claim to have color fax function. Color fax has been called ITU-T30e standard, but this technology has not been widely supported. Most color fax machines can only transmit color documents with the same brand fax machines. [Editor] The modern substitute of fax machine is to send computer image files as attachments by e-mail. In this way, color images can be transmitted and higher resolution can be enjoyed. Please refer to Internet fax. There have been many studies to enable the receiver to process the received fax more effectively. Nowadays, digital storage is much cheaper than that in 1960s+0970s. However, junk fax has become a common problem and caused a lot of paper waste. Some more expensive communication servers don't print the received faxes immediately, but send them to mailboxes and store and forward them in other ways, such as e-mail or voice mail. See Unified Messaging. [Editor] Alexander Bain, a Scottish inventor, obtained a patent at 1843, which is considered to be related to the appearance of the fax machine. He used his knowledge of electric clocks and pendulums to make the first progressive scanning mechanism from front to back. 186 1 year, the first fax machine, Pantelegraph, was sold by Giovanni Casell before the telephone was officially invented. 1924, Richard H. Ranger, the designer of RCA, invented the wireless photoelectric fax machine, which is the predecessor of today's fax machine. A photo of President John Calvin Coolidge of the United States was transmitted from new york to London on1October 29th, 1924+ 165438, which became the first image transmitted by radio fax technology and put into commercial use two years later. Radio fax is still used to transmit weather images and information today. An early fax method, Hellschreiber, was invented by Rudolf Hull in 1929, and was the pioneer of mechanical image scanning and transmission at that time. From 65438 to 0985, Dr. Hank Magnuski, the founder of GammaLink, made the first computer fax expansion card GammaFax.