DE3014218C2 - Facsimile transmission and reception appts. - enables selectively underlined identification characters to be printed on facsimile reproduction and reduces data transmission errors - Google Patents

Abstract

Character codes having underline bits are read out of a memory (22). A character generator (18) generates character video signals in the form of horizontal scan lines corresp. to the codes. A line generator (30) generates line video signals corresp. to the underline bits. Where the appts. is provided in a facsimile transmitter, the codes correspond to an identification of the station or the like and are entered into the memory (22) manually. Where the appts. is provided in a facsimile receiver, the codes are received by a low speed modem (43) and stored in the memory (22). In either case, the receiver reproduces an original document in response to facsimile video signals with the identification characters, underlined where desired, superimposed on the document pattern.

Description

The invention relates to a facsimile device according to the preamble of claim I.

It is known in addition to facsimile video signals. which correspond to a scanned template to transmit identification marks which the Sendesia * lion, the airtime, the phone number of the Sendesta * tion and the like. These code signals are in general before transmitting the facsimile pattern sentj so that they are at the head of the facsimile display are printed out and the attentiveness of the operator in the receiving station on itself draw.

So far, a separate device for the identification code has been required in both stations. In the receiver, the codes must be converted into video signals in the form of scan lines so that they can be used by the printer at the receiving station. This requires an unnecessarily complicated and expensive one Arrangement.

Often times, certain ponds should be underlined (or a line above them) to highlight them attached). So far, only a single method is available for this in order to achieve various To transmit codes for characters that are to be underlined and for characters that are not to be underlined. This requires twice the number of codes which have to be decoded on the receiving side and es an even more complicated decoder is required.

The codes can also be converted into line scan video signals in the transmitter and these Signals can then be sent directly. Even if the recipient does not use a special Circuit is provided. he can reproduce the identifiers because they have the same format as the Have facsimile video signals. With such an arrangement, however, there is a problem that the High-frequency image signals get lost or through a transmission via normal telephone lines a noise on the line can be distorted. Although the receiver is provided with circuitry is. to minimize amplitude and phase distortion, and although it also has a has automatic gain control circuit, However, there are signal losses, especially in the first part of the transmission, which is the identification information is equivalent to.

The identification information is provided at the head of the Fdksimileewideababe in order to attract the attention to attract the operator. When this information is illegible. it is impossible that Identify the sending station and ts is also not possible to contact the sending station, to request a retransmission. F. a solution this difficulty is at each sent Scan line an error check. for example a Carry out a CRC check. This lengthens however, the amount of time required for a transfer essential; in addition, the receiving device becomes more complicated, so that 'your manufacturing costs correspond increase accordingly.

The invention is therefore based on the object of providing a facsimile device of the specified gaining create with the help of a simple additional device Identification codes for playback can be underlined.

This object is achieved according to the invention by the im characterizing part of claim i specified features solved.

The advantages achieved with the invention are based on as follows: In every character code there are Contain information indicating whether or not the code Corresponding characters have to be underlined or not, each code consisting of, for example several code bits and an underline bit. When receiving an appropriate Information is triggered by a line generator that generates the corresponding underline video signals, i.e., certain selected characters displayed are underlined.

When used in a facsimile transmitter, the identification codes, for example, the identification of the Station correspond, where they are entered manually in a memory.

When used in a facsimile receiver, the identification codes are from a slow modem received and placed in a memory.

The invention is illustrated below on the basis of exemplary embodiments with reference to schematic drawings explained in more detail. It shows

Fig. 1 is an illustration of received facsimile information.

F i g. 2 is a block diagram of a facsimile device according to the invention provided in a transmitter;

3 shows an illustration of the reproduction of an identification code without underlining,

4 shows an illustration of the reproduction of a Identification codes with underlining,

F i g. 5 shows the interaction between transmitter and receiver in facsimile transmission and

6 is a block diagram of one in a receiver provided facsimile device according to the invention.

In Fig. 1 shows recorded, received facsimile information. The corresponds to hatched area of the facsimile reproduction of an original. The identification code at the top of the The recording is called »RICOH No. 427 ". The word "RICOH" is not underlined here, while the subsequent characters »No. 427 «are underlined; depending on your choice, all, none or selected Identification codes are underlined.

A facsimile device, identified as a whole by the reference numeral 11, is shown in FIG. 2 shown. A scanning device with a lens arrangement 13 scans an original 14 and generates facsimile video signals which correspond to the horizontal scanning characters of the image pattern. The signals are selectively transmitted through a scanner 16 and a modem 17 on a transmission path such as a telephone line to a receiver. The scanning device also generates a reset signal at the beginning of the scanning of the original 14 horizontal clock pulses A and vertical clock pulses B. The scanning is carried out line by line horizontally. As soon as a horizontal line has been scanned, the original 14 is advanced one step so that the next line can be scanned.

A row generator 18 has a column counter 19 for counting the horizontal clock pulses. The column count 19 is a modulo 7 counter and emits an overflow signal when the count exceeds zero. The overflow signal C is applied to a character counter 21, the output of which is connected to a code memory 22 as an address input. The output of the code memory 22 is connected to a character generator 23. The output of the character generator 23 is connected to a multiplexer 24, the output of which is connected to an input of an exclusive OR gate 26. The output of the OR gate 26 is connected to the switch 16.

The vertical clock pulses B are sent to a scanning line counter 2? created, which is a modulo II counter '. The output of the line counter 27 is connected to the multiplexer 24 and also to a decoder 28 of a video signal line generator 30. The output of the decoder 28 is connected to an input of an AND element 29. An output of the code memory 22 is also applied to an input of the UN D element 29.

The identification codes, the »RICOH No. 427 "or another desired message, which are to be printed out at the head of the facsimile reproduction on the receiving side are shown in the memory 22 by means of an (not shown) input keyboard and the like. The identification message is selected by the operator and stored by hand in the memory 22, usually in the form of an 8-bit code. The first seven bits can be in an ASCII or other common format, while the eighth bit indicates whether the the characters corresponding to the code must be underlined. Although the following description refers to a Underlining relates, the invention can of course also be used to add a line or another marking that corresponds to the respective symbol to be affixed over it. The eighth The bit output of the code memory 22 is applied to the input of the AND gate 29.

During operation, the scanning device 12 emits the reset signal and begins scanning the original 14. The counters 18, 21 and 27 are reset by the reset signal. The scanner 12 generates the horizontal clock pulses A in synchronism with the scanning of the respective horizontal bits of each scanning line. The column counter 18 counts the pulses A and indicates the overflow signals C , which are counted by the character counter 21.

According to the reset signal, the switch 16 leaves the output of the OR gate 26 for one jj transmission to modem 17 through. When the count in the counter 21 reaches a predetermined value which corresponds to the beginning of the information or message field on the display, which also corresponds to the address of the memory location in the memory 22 which contains the first character code, the Code is applied from the memory 22 to the character generator 23. Before, the output signals corresponded of the switch 12 of an empty area since the outputs of the character generator 23 and the multiplexer :, 24 are zero 4y were.

When the first character code is applied to the character generator 23, the contents of the counters 19 and 27 become zero, thereby displaying the first column of a character and the first scanning line of the character, respectively. V) As in Fig. 4, each character is assigned an area of seven columns and eleven lines. Columns 2 through 6 are used as actual drawing areas, while columns 1 and 7 serve as spaces or spaces. Lines 2 through 8 are used for the drawing area. Line 9 is a blank line, line 10 is underlined (if necessary), and line 11 is again a blank line. If it is not to be underlined, see the symbol as shown in FIG. 3.

Correspondingly in the zero position in the counter 19, the generator 23 generates the first row of the first Character in the memory 22. Corresponding to the zero in the counter 27, the multiplexer 24 can top bit of the first column of the character through. The decoder 28 outputs a high output only when if the count in derri counter 27 is nine according to the underline or * zcile As a result

its is ddr output of decoder 28 low, and the AND gate 29 blocked, the low output of the AND gate 29 is to the exclusive OR gate which then operates as a non-losing buffer and the output of the multiplexer 24 i passes unchanged.

At the next horizontal clock pulse A , the column counter (9 is incremented and the character generator 23 generates the second column of the character. Since the count in the line counter 27 is still zero, the multiplexer 24 lets the top bit of the first line through. This sequence continues for the third through seventh columns of the character so that the top line of the character is generated and fed to the OR gate 26 and switch 16 for transmission.

At the eighth pulse A , the counter 19 goes to zero and emits the overflow or carry pulse Cab, by which the counter 21 is switched on. The second character code is then present at the output of the memory 22. The top line of the second character is then generated and transmitted in the same way as the top line of the first character. This continues until the top scan lines of all characters have been transmitted.

When the counter country displays a predetermined value in the counter 21 which indicates the end of the label area, the memory 21 outputs a signal D. whereby the switch 16 is toggled and then the output of the scanner 12 passes. This consists of the J0 facsimile video signals for the first scan line. On the other hand, the memory 22 can store a predetermined code after the last identification character code and output the signal D accordingly.

When the scanning device 12 begins with the next line J5 of the original 14, it generates a vertical scanning pulse B. by means of which the counters 19 and 21 are reset and the switch 19 is switched over so that it passes the output of the OR gate 26. The line counter 27 is indexed by the pulse B , which causes the multiplexer 24 to pass the second scanning lines of the characters which have been generated by the character generator 23. The above-described process is repeated with the exception that the second lines of the characters stored in the memory 22 are transmitted via the switch 16. The lines of the lines stored in the memory 22 are then transmitted in the same format as the facsimile video signals generated by the scanner 12. 5 »

This continues until the ninth (blank) lines of characters are transmitted. According to that next clock pulse Z? the multiplexer 24 outputs a zero or a logic low output, since it only has one Has capacity for nine scanning lines. The decoder 28 ″ generates a high output to the AND gate 29 to release. The character codes are then sequentially read in the same manner to thereby read the characters to accomplish. The eighth bit, which indicates whether or not to be underlined, is sent to AND gate 29 **> applied When the eighth bit is high, the output of AND gate 29 goes high and via the OR gate 26 and switch 16 as an underline video signal let through. When the eighth bit is a logic low, indicating that not to * " is underlined, are the outputs of the AND gate 29, the OR gate 26 and the switch 16 are logic low, which is a non-underlining video signal is equivalent to.

In response to the next clock pulse B , the output of deco delivery 28 goes low and video signals are generated for an empty eleventh line. In the invention, the character video signals are thus generated, which are then followed by the underscoring video signals by means of a simple circuit arrangement. Corresponding to the next clock pulse, the counter 27 then overflows, and the scanning device 12 emits a further reset signal, in response to which the switch 16 lets the facsimile video data through.

More than one line of characters can be provided by adding additional bits for the line counter and additional storage capacity in memory 22 are provided. The extra bits in line counter 27 would then count how many times the counter 27 overflows and this counting result would then be used as a more significant address bit input for memory 22 used. Although it is shown flour, it can also a data compressor for example with the help of a track length coding between the switch 16 and the modem 17 may be provided. The device 11 is shown and described as having individual counters, etc. Some or all of the operating units can, however, be combined in a digital computer which, in the form of software, has a central Computing unit or a processor, a read-only memory, a random access memory or a Has random memory and the like.

The invention can also be provided in a facsimile receiver as shown in FIG. 5 and 6 shown is. In this case, the identification codes are sent to the recipient in ASCII or a similar one Format transmitted using a slow modem. The transfer process is shown in FIG. 5 shown.

1. In the transmitting station, the operator brings the original to be transmitted into the scanning device and inputs the identification code into the device by means of a keyboard and the like. the The operator then dials the telephone number of the desired receiving station. The receiving station however, you can also dial the transmitting station and request the transmission of a specific template.

2. After switching on the telephone circuit, the receiving station transmits data that its Show reception possibilities (the baud rates, the line density, etc.) via a slow modem.

3. The sending station selects the receiving station's highest reception capabilities and transmits in addition to the size of the original, data indicating these possibilities to the receiving station, soft sets these operating modes and prepares for a reception. Also broadcasts the sending station stores the identification codes which the receiving station stores in a code memory saves All this data is transmitted in code form over slow modems. Then prepare The receiving station may choose to receive facsimile video data through a high-speed modem.

4. The transmitting station sends test data via the high-speed modem in order to adjust the transmission line to consider. The test data have a predetermined binary pattern, which the receiving station with regard to the signal level, a bit error, etc.

5. The receiving station tells the sending station whether or not it can receive satisfactory data through the slow modem.

6. If the receiving station can receive data, the sending station sends the facsimile video signals via the high-speed modem, which is sent by the Receiving station can be received via a high-speed modem. The labeling information is activated on the facsimile reproduction prior to receiving the facsimile data or at the same time as printed out upon receipt. If the receiving station cannot receive data, the Priority or urgency of the transmission mode reduced until sufficient data transmission is available is possible. [5

7. After finishing the transmission of the facsimile data, the sending station sends a final one Message indicating whether another template is to be sent. These data are via the fast Transfer modem.

8. The receiving station then informs the transmitting station via the slow modem that it is receiving has finished and that the receiving station is ready to receive another transmission if so is displayed.

In the case of a multi-sided transmission, the identification data can, if required, on each Page or only on the first page. In the first-mentioned case, the identification message have a page number. Since the identification codes protrude over the slow modem the transmission quality is very high and the bit errors are low. Even so, the transmission speed is the codes are very high. It can even r have a higher level of reliability without an appreciable Increase the transmission time can be achieved by adding a number of Ma! transfer ^ will. A majority logic can be provided in the receiver to enable precise identification of the To ensure codes. The identification codes only need to be transmitted after a first page ■ become.

In FIG. 6, the device according to the invention is designated in its entirety by 41 Receiver provided. Incoming data and identification codes are sent to a switch 42 created. The identification codes are transferred from the switch 42 via a slow modem 43 to the Code memory 22 passed. Identical or corresponding parts are given the same reference numerals as; in Fig.2 denotes. The facsimile ^ video signals that the The template are sent via switch 42 and via a high-speed modem 44 to switch 16 hinged.

In this case, clock pulses / t 'and D' and the reset signal are generated by a plotter 46 which reproduces the original and the indicia in accordance with the facsimile video signals and the character video signals, respectively. The clock pulses A ' and B' are frequency-divided by a column multiple counter 47 and a row multiple counter 48, respectively, to obtain the pulses A and ΰ . Counter 47 controls the vertical size of the labels, while line counter 48 controls the horizontal size. The counters 47 and 48 have variable frequency dividers. For example, if the characters are to be enlarged by a factor of four, each of the counters 47 and 48 has a frequency division ratio of four. In this way, each point can be printed in four consecutive column positions and four consecutive line positions.

The operation of the device 41 is the same as that of the device 11, except that the output of the Switch 16 is connected to the input of the plotter 46 and not to the input of the modem 17.

In the embodiment in FIG. 2, character video signals are generated according to a character code, and the character video signals are transmitted in addition to the line video signals. In the embodiment according to Fi g. 2 the codes are transmitted themselves, which are the underline bits and the character and line video signals generated by the receiver contain. In the embodiment according to FIG. 2 can be used for identifiers and underscores an unchanged facsimile receiver.

For this purpose 3 sheets of drawings 130 263/481

Claims (7)

1 claims: 1. Facsimile device with an arrangement for generating facsimile video signals, with a Memory for identification codes and with one Character generator for generating character video signals corresponding to identification codes, characterized in that each character code contains information about whether a character corresponding to the code must be underlined that a line generator (18) has this Retrieves information and generates underline video signals corresponding to the locations under the to underlined characters correspond, and that a switching arrangement (16) optionally a combination is tion of the character video signals and the underline video signals or the facsimile video signals lets through. 2. Facsimile device according to claim 1, characterized in that each code is several Has code bits and an underscore bit, and that the line generator (18) provides the underline video signals generated if the corresponding underline bits are specified. logical Have states. 3. Facsimile device according to one of claims 1 or 2, characterized by a device for 4, u-> reading the codes from the memory (22) and for feeding the codes to the character generator (23). so 4. Faksinr'e device according to one of the claims ! to 3. characterized in that the character generator (23) the breeding video signals in Form of scanning lines and a line counter (27) for the scan cells, the js Line generator (18) generates the underline video signals only when the count in the line counter (27) has a predetermined value corresponding to an underline. 5. Facsimile device according to one of the claims before 1 to 4. characterized by a transmitter for transmitting the character video signals and the Underline video signals. 6. Facsimile device according to one of the claims I to 5. characterized by a receiver for the codes with a memory for the codes. 7. Facsimile device according to one of claims I to 6, characterized by a plotter (46) for reproduction, an original depending on the facsimile video signals with the characters so of the identification code and with underlines representing the superimposed character video signals and underline video signals, respectively.