JPH09275481A - Communication terminal equipment and communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To revise the communication rate into a proper communication speed depending on the processing state of transmission data or the processing state of reception data. SOLUTION: In the case of communication in compliance with the ITU-T recommendations V.34, a receiver side stores received image data to an image memory and data in the memory are decoded and printed out (steps S28, S29). For example, when a rate required for the processing from the reception of the image data till printing is smaller than the communication rate, the idle capacity of the memory is decreased as the data reception is progressed and there might be a high possibility of memory overflow. In this case, the receiver side makes a request of communication speed revision to a transmitter side to slow down the communication rate (step S34) and sets again the communication rate to be a proper rate with the transmitter side based on the request (step S35).

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a communication terminal device such as a facsimile device and a communication method. More specifically, the present invention relates to, for example, the recommendations of ITU-T (International Telecommunication Union-Telecommunication Standardization Sector) Recommendation V. 34
The present invention relates to a communication terminal device and a communication method capable of transmitting data at high speed in conformity with the above.

[0002]

2. Description of the Related Art In recent years, it has become necessary to send a large amount of document data and the like at a high transmission rate with the informationization of society.
In order to respond to such a request, ITU-T Recommendation V. 3
There is proposed a facsimile apparatus capable of performing communication in conformity with No.4. This Recommendation V. In the communication by the C.34, since data can be transmitted at a maximum speed of 33600 bps, it is a very effective communication procedure for efficiently transmitting a large amount of data in a short time.

[0003]

However, the above-mentioned V.
When the 34 communication function is provided in the facsimile device, the following problems occur. That is, in the case of performing facsimile communication between the transmission side device and the reception side device, if the decoder or printer of the reception side device has a low processing capability, the reception device decoding processing speed or the decoding data The print processing speed may be delayed with respect to the data transmission speed. In such a case, the received data cannot be printed reliably, and in some cases, the received data may be lost. This problem is not only the problem of the receiving side device, but also in the transmitting side device, if the reading unit or the encoder has a low processing capability, the reading processing speed of the original document or the encoding processing speed of the read data may be transmitted. There is a problem in that a delay occurs with respect to the speed, data cannot be reliably transmitted, and transmission data is lost.

On the other hand, there is also a facsimile apparatus which is provided with an image memory for storing received data, stores the received data in the image memory, and reads the data in the image memory to perform a decoding process and a printing process. However, even in this case, if the decoding processing speed and the printing processing speed are slower than the data transmission speed, the speed at which the received data is accumulated in the image memory is faster than the speed at which the data in the image memory is read for printing. Will be faster. Therefore, the image memory may overflow before the reception of the data is completed, and as described above, there arises a problem that the received data is lost and reliable printing cannot be performed.

The present invention has been made to solve the above problems, and its purpose is to change the communication speed to an appropriate value according to the processing status of transmission data or the processing status of reception data. It is to provide a communication terminal device and a communication method capable of surely transmitting or receiving data at a speed as high as possible.

[0006]

In order to achieve the above object, the invention of claim 1 is a communication terminal device having a function capable of changing a communication speed during data communication, and processes received data. Reception data processing means, request means for requesting the transmission side to change the communication speed according to the processing status of the processing means, and speed setting means for resetting the communication speed with the transmission side based on the request. It is equipped with.

According to the invention of claim 2, in claim 1,
The reception data processing means includes a storage means for storing the reception data and a recording means for printing on a recording paper based on the data in the storage means at the time of receiving the data, and the requesting means stores the free space in the storage means. Accordingly, the transmission side is requested to change the communication speed.

According to the invention of claim 3, in claim 2,
The requesting means includes table data in which the relationship between the free space of the storage means and the communication speed is set, and the request means determines whether to request the transmission side to change the communication speed based on the table data, and sets the speed setting. The means resets the communication speed with the transmission side based on the table data.

According to a fourth aspect of the present invention, there is provided a communication terminal device having a function capable of changing a communication speed during data communication, the transmission data processing means for processing the transmission data, and the processing status of the processing means. A request means for requesting the receiving side to change the communication speed and a speed setting means for resetting the communication speed with the receiving side based on the request are provided.

According to a fifth aspect of the present invention, there is provided a communication method capable of changing the communication speed during the data communication, and the communication method is performed according to the processing status of the transmission data or the processing status of the reception data.
The communication partner is requested to change the communication speed, and the communication speed with the communication partner is reset.

Therefore, the inventions of claims 1 to 5 have the following effects. According to the invention of claim 1, when the data is received, the transmission side is requested to change the communication speed according to the processing state of the reception data by the reception data processing means, and based on the request, the communication with the transmission side is performed. Communication speed is reset. For example, if the speed required for processing from receiving data to printing is delayed with respect to the communication speed, the sender is requested to change the communication speed,
Based on the request, the communication speed with the transmission side is reset to an appropriate speed. Therefore, the data can be reliably received at the fastest possible speed.

According to the second aspect of the invention, the transmission side is required to change the communication speed according to the free space of the storage means.
For example, if the speed required for the processing from the reception of data to the printing is delayed with respect to the communication speed, the free space of the storage means decreases as the data reception progresses. In such a case, it is determined that there is a high possibility that the storage means will overflow and interfere with the processing of the received data, and the transmission side is required to change the communication speed in order to slow the communication speed.

According to the third aspect of the invention, it is possible to easily determine whether or not to make a communication speed change request and reset the communication speed based on preset table data. According to the invention of claim 4, at the time of data transmission, depending on the processing state of the transmission data by the transmission data processing means,
The receiving side is requested to change the communication speed, and the communication speed with the receiving side is reset based on the request. For example, if the speed required for processing from reading an image on an original to transmitting the read image data is delayed with respect to the communication speed, the receiving side is requested to change the communication speed. Based on the request, the communication speed with the receiving side is reset to an appropriate speed. Therefore, the data can be surely transmitted at the highest speed.

According to the invention of claim 5, at the time of transmitting or receiving data, the communication partner is requested to change the communication speed according to the processing condition of the transmission data or the processing condition of the reception data. The communication speed between and is reset to an appropriate speed.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION First Embodiment Hereinafter, a first embodiment in which the present invention is embodied in a facsimile apparatus will be described with reference to FIGS. 1 to 5.

FIG. 1 shows the circuit configuration of the facsimile apparatus of this embodiment. A CPU (Central Processing Unit) 1 includes a ROM (Read Only Memory) 2 that stores programs for controlling the operation of the entire apparatus, and a RAM (Random Access Memory) that temporarily stores data and the like necessary for control. ) 3 is connected. The NCU (network control unit) 4 has a function of controlling connection with the telephone line L, sending dial pulses corresponding to the telephone number of the other party, and detecting an incoming call. The modem 5 uses a V. 34 is provided with a function for enabling a communication procedure. Further, in this embodiment, the CP
The U1, the ROM2, the RAM3, and the modem 5 constitute requesting means and speed setting means.

The reading unit 6 as a reading means is composed of a CCD image sensor or the like, and reads an image on the original line by line while moving the original in the sub-scanning direction. The image memory 7 as a storage unit stores the received image data and the image data read by the reading unit 6 into an MR coding system (modified read coding system) and an MMR coding system (modified MR coding system). It is stored in a state encoded by a method such as. Codec 8 as encoding / decoding means
Encodes the image data read by the reading unit 6, decodes the encoded image data in the image memory 7, and outputs the encoded image data to the recording unit 9. The recording unit 9 as recording means is, for example, an electrophotographic printer, and prints on recording paper based on image data decoded by the codec 8, that is, received image data, image data read by the reading unit 6, and the like. I do. In this embodiment, the reading unit 6 and the codec 8 constitute a transmission data processing unit, and the image memory 7, the codec 8 and a recording unit 9 constitute a reception data processing unit. The key operation unit 10 includes various operation keys such as a numeric keypad for inputting a telephone number and the like and a start key for starting a facsimile communication operation. The display unit 11 displays various information such as the input telephone number.

Next, V. An outline of the 34 communication procedure will be described. This V. In the 34 communication procedure, the data transmission rate is N × 2400 bps (N is an integer from 1 to 14)
, The maximum transmission speed is 33600bp
s. This V. In the 34 communication procedure, full-duplex communication capable of simultaneously transmitting data in both directions is possible, and the communication speed can be freely changed within the above range according to the state of the communication line even during communication. ing. The change of the communication speed can be requested by the transmission side to the reception side, or the reception side can request the transmission side. Therefore, V. In the No. 34 communication procedure, data can be transmitted as fast as possible while avoiding data transmission errors.

Then, the facsimile apparatus of the present embodiment uses the V. 34 The communication speed change function, which is one of the features of the communication procedure, is used to optimize the communication speed according to the processing status of the transmission data or the processing status of the reception data so as not to hinder the processing. It tries to change to a different speed. Incidentally, the processing of the transmission data means the processing from the reading of the image on the original to the transmission of the read image data, and more specifically, the processing of reading the image on the original by the reading unit 6. , And its read image data are encoded by the codec 8. Further, the processing of the received data means a processing from the reception of the image data to the printing, and more specifically, the processing of decoding the received image data stored in the image memory 7 by the codec 8. , And the decoded data thereof are printed on the recording paper by the recording unit 9.

Table data as shown in FIG. 2, for example, is stored in the ROM 2 in advance. This table data corresponds to each free space of the image memory 7, and sets the communication speed which is considered to be appropriate when the free space is available. As shown in the figure, in this table data, the free space of the image memory 7 is 1
Corresponding to the case of 28 Kbytes or less, the communication speed is 48
It is set to 00 bps. Further, the free space of the image memory 7 is larger than 128 Kbytes and 256 Kbytes.
The communication speed is set to 14400 bps corresponding to the following cases. Furthermore, the free space of the image memory 7 is 25
The communication speed is set to 28800 bps corresponding to the case of more than 6 Kbytes and less than 512 Kbytes. Also, the free capacity of the image memory 7 is 512 Kbytes.
Corresponding to the case of more, communication speed is 33600 bps
Is set to

Next, the operation of the facsimile apparatus configured as described above will be described. First, in the case where the facsimile apparatus of this embodiment is the sender side, the CPU 1
The communication operation performed under the control of 1 will be described with reference to the flowchart shown in FIG.

Now, as shown in FIG. 3, the key operation unit 10
When a call is made to the receiving side device based on the operation of the ten-key pad (step S1), the line with the receiving side device is connected for four times based on the response from the receiving side device (step S1).
2). Next, the ITU-T Recommendation V.5 is used by the modem 5.
The communication procedure based on 8 is executed (step S3).
In addition, this V. The eight-communication procedure is a procedure in which the transmitting side and the receiving side report the modulation schemes that they can support, and automatically determine the optimal modulation scheme between them. This V. By executing the communication procedure of FIG. It is judged whether or not it has a communication function (step S4). V.34 communication function is not provided. The communication procedure is executed by a mutually matching modulation method other than the 34 communication procedure (step S5).

On the other hand, the receiving side device is 34, when the communication function is provided. The communication is started according to the N.34 communication procedure (step S6). This V. 34. In the communication procedure, first, probing (measurement) of the line state with the receiving side device is performed, various parameters are set in the modem 5 based on the measurement result, and training (adjustment) of the modem 5 is performed. ) Is performed (step S7). At this time, the communication speed with the receiving device is also set. Then, the processing of the transmission data is started (step S8). That is, in step S8, the operation of reading the image of one page of the original by the reading unit 6 and the operation of encoding the read image data by the codec 8 are started, and the encoded data is set by the modem 5. V. The operation of modulating and transmitting in a modulation method compliant with No. 34 is started. The data communication speed at this time is set to, for example, the maximum communication speed of 33600 bps if the line condition is good.

When the processing of the transmission data is started, the manuscript 1
It is waited until the reading of the pages is completed (step S9). Then, when the reading of one page of the original is completed, it is determined whether or not there is the next read original based on the detection result by the original detection sensor (not shown) (step S).
10), if not, the transmission process ends.

If there is the next document to be read, it is determined whether or not it is necessary to request the receiving device to change the communication speed (step S11). Here, the reading unit 6
Document reading processing speed and codec 8 encoding processing speed (in other words, transmission data processing speed) are delayed with respect to the image data communication speed, or vice versa. When the processing speed is delayed, it is determined that it is necessary to request the receiving side device to change the communication speed. Note that the processing speed of the transmission data is delayed due to a decrease in the ability of the CPU 1 to process the transmission data due to other processing such as printing being performed in parallel during the transmission data processing.

If the result of the determination in step S11 is YES, a request is made to the receiving side device to change the communication speed (step S12). Then, based on the request, the communication speed with the receiving side device is reset to an appropriate speed that does not hinder the processing of the transmission data (step S13). If the determination result in step S11 is NO, it is determined whether or not there is a request from the receiving side device to change the communication speed (step S1).
4). Here, when there is a request from the receiving side device, the receiving side device has a delay in the processing speed of the received data with respect to the communication speed, or the communication speed is lower than the processing speed of the received data. When it is determined that a delay has occurred, the process proceeds to step S13. Then, in step S13, the communication speed with the receiving side device is reset to an appropriate speed that does not hinder the processing of the received data.

After the processing of step S13, the above-mentioned step S
8, the next original is read, and the read image data is transmitted at the reset communication speed. on the other hand,
In step S14, if there is no request from the receiving side device, the communication speed is not changed and the process directly returns to step S8 to read the read image data of the next document at the currently set communication speed. Sent.

Next, the communication operation performed under the control of the CPU 1 when the facsimile apparatus of this embodiment is the receiving side will be described with reference to the flowchart shown in FIG.

Now, as shown in FIG. 4, when a calling signal from the exchange based on a call from the transmitting side device is detected through the NCU 4 (step S21), the NCU 4 establishes a line with the transmitting side device. It is connected (step S22). Next, the ITU-T Recommendation V.5 is used by the modem 5. The communication procedure based on 8 is executed (step S23). This V. 8 by executing the communication procedure, 34
It is determined whether or not the communication function is provided (step S2
4), V. V.34 communication function is not provided.
The communication procedure is executed by a mutually matching modulation method other than the 34 communication procedure (step S25).

On the other hand, the transmitting side device is 34, when the communication function is provided. 34, the communication is started according to the communication procedure (step S26), and the step S of FIG.
In the same manner as 7, the setting of various parameters in the modem 5 and the training of the modem 5 are performed (step S
27). At this time, the communication speed with the transmitting device is also set. Next, the processing of the received data is started (steps S28 and S29). That is, in step S28, the operation of receiving the image data for one page of the original document transmitted from the transmission side device at the previously set communication speed,
The received image data and the received image data are V. The operation of demodulating by the modulation method compliant with 34 and storing in the image memory 7 is started. Then, in step S29, the operation of decoding the received image data in the image memory 7 by the codec 8 and the operation of printing on the recording paper by the recording unit 9 based on the decoded data are started.

When the processing of the received data is started, the manuscript 1
It is waited for the reception of the page image data to be completed (step S30). When the reception of one page of the original is completed, it is determined whether or not there is received image data of the next page (step S31). If not, printing of all received image data in the image memory 7 is completed. The processing is ended at the point of time (step S32).

If there is received image data for the next page, it is determined whether or not it is necessary to request the transmission side device to change the communication speed (step S33). This judgment is made based on the table data of FIG. More specifically, first, after confirming the current free space of the image memory 7, the table data of FIG. 2 is referred to, and the current communication speed is set to the communication speed corresponding to the free space of the image memory 7. It is determined whether or not

For example, the current communication speed is 14400 bp
It is set to s. In this case, the current free space of the image memory 7 is more than 128 Kbytes and 2
If it is 56 Kbytes or less, it is determined that the current communication speed is appropriate and it is not necessary to request the transmission side device to change the communication speed. If the current free space of the image memory 7 is 128 Kbytes or less, or more than 256 Kbytes, it is necessary to request the transmission side device to change the communication speed because the current communication speed is not appropriate. It is judged that there is.

That is, if the decoding processing speed of the codec 8 and the printing processing speed of the recording unit 9, that is, the processing speed of the received data is slower than the communication speed of the image data, the image data in the image memory 7 is read out for printing. The speed at which the received image data is accumulated in the image memory 7 is faster than the speed.
Therefore, in such a case, the amount of data in the image memory 7 increases as the image data is received, and the free space in the image memory 7 decreases. And the image memory 7
When the free space of the image memory 7 becomes small, the free space of the image memory 7 further decreases with the progress of the reception thereafter, and the image memory 7 may overflow to cause a trouble in the processing of the received data.

On the other hand, when the communication speed of the image data is slower than the processing speed of the received data, the image data in the image memory 7 is read out for printing at a speed higher than the speed at which the received image data is accumulated in the image memory 7. The speed is faster. Therefore,
In such a case, as the image data reception progresses,
The amount of data in the image memory 7 decreases, and the free space in the image memory 7 increases. Then, when the amount of data in the image memory 7 decreases, the amount of data in the image memory 7 further decreases with the progress of reception thereafter, and the received data is printed until the amount of data exceeds a predetermined amount. It may be necessary to wait.

As described above, when the processing speed of the received data is delayed from the communication speed of the image data,
The free space of the image memory 7 gradually decreases. Further, when the communication speed is delayed with respect to the processing speed of the received data, the free space of the image memory 7 gradually increases.
Then, in any case, if the current communication speed is kept as it is, the possibility that the processing of the received data will be hindered gradually increases as the reception progresses. In the table data of FIG. 2, the communication speed considered to be appropriate is set corresponding to each predetermined free space of the image memory 7. Therefore, in step S33, when the current communication speed is not set to the communication speed corresponding to the free space of the image memory 7 when the table data of FIG. 2 is referred to, the processing of the received data is hindered. Since it is highly likely that this will occur, it is determined that it is necessary to request the transmission side device to change the communication speed.

As described above, when the result of the determination in step S33 is YES, the transmission side device is requested to change the communication speed (step S3).
4). Then, based on the request, the communication speed with the transmission side device is an appropriate speed that does not hinder the processing of the received data, that is, the speed at which the free space of the image memory 7 does not decrease further, or does not increase. It is reset to such a speed (step S35). Step S
If the determination result in 33 is NO, it is determined whether or not there is a request from the transmitting side device to change the communication speed (step S36). Here, if there is a request, the processing speed of the transmission data is delayed with respect to the communication speed or the communication speed is delayed with respect to the processing speed of the transmission data in the transmission side device. Then, the process proceeds to step S35. Then, in step S35, the communication speed with the transmission side device is reset to an appropriate speed that does not hinder the processing of the transmission data.

Then, returning to the step S28, the image data of the next page is received at the reset communication speed. On the other hand, in step S36, if there is no request from the transmission side device, the process returns to step S28 without changing the communication speed, and the image data of the next page is received by the currently set communication. Done at speed.

FIG. 5 (a) shows a procedure in which the modem 5 of the transmitter device requests the modem 5 of the receiver device to change the communication speed. FIG. 5B shows a procedure in which the modem 5 of the receiving side device requests the modem 5 of the transmitting side device to change the communication speed. In addition, V. In the No. 34 communication procedure, the communication of the image data between the transmission side apparatus and the reception side apparatus is performed by half-duplex communication, but the procedure shown in FIG. 5 is performed by full-duplex communication.

First, the procedure shown in FIG. 5A will be described. Modem 5 of the transmitting side device (hereinafter referred to as the transmitting side)
Is the case where the document reading processing speed of the reading unit 6 or the encoding processing speed of the codec 8 (that is, the processing speed of the transmission data) is delayed with respect to the communication speed, or the communication speed is higher than the processing speed of the transmission data. If there is a delay,
After transmitting the image data for one page, the PPh signal and the ALT signal are transmitted to the modem 5 (hereinafter referred to as the receiving side) of the receiving side apparatus after a silent period of 70 ± 5 ms. Then, this PPh signal becomes a communication speed change request signal from the transmitting side to the receiving side, and at the transmitting side, this Ph signal is transmitted.
The operation of transmitting the Ph signal corresponds to the process of step S12 of FIG. On the receiving side, the PP from the transmitting side
The determination as to whether or not the h signal is detected is based on the above-mentioned FIG.
This corresponds to the process of step S36.

When the receiving side detects the PPh signal from the transmitting side, it transmits the PPh signal and the ALT signal to the transmitting side. When the transmitting side detects the PPh signal from the receiving side, it transmits the MPh signal to the receiving side within a predetermined time. In addition, the receiving side, after transmitting the ALT signal for a predetermined time,
The MPh signal is transmitted to the transmitting side.

At the 20th to 23rd bits from the beginning of the MPh signal transmitted from each of the transmitting side and the receiving side, the maximum data transmission rate allowed by itself is indicated by 4-bit data. The 4-bit data is a binary number representing the value of "N" when the maximum data transmission rate is N x 2400 bps (N is an integer from 1 to 14). The transmitting side and the receiving side each have MPh from the other side.
When at least one signal is detected, the currently transmitting M
After the transmission of the Ph signal is completed, the E signal is transmitted to the other party. Then, the transmitting side and the receiving side respectively communicate with each other based on the maximum data transmission rate indicated in the MPh signal transmitted from themselves and the maximum data transmission rate indicated in the MPh signal received from the other side. Reset. This communication speed is set to the slower speed of the maximum data transmission speeds indicated in both MPh signals. Then, the operation of resetting the communication speed is performed as shown in FIG.
This corresponds to the processing of step S13 of step S35 and step S35 of FIG.

In addition, the transmitting side and the receiving side respectively transmit the control channel data to the other side after transmitting the E signal, and also receive the E signal and the control channel data from the other side. The control channel data includes data corresponding to the data shown in the DIS signal and the DCS signal, which are facsimile control procedure signals in the G3 facsimile machine, for example. The receiving side grasps the functions and the like of the other side.

After transmitting the control channel data, the transmitting side transmits the image data of the next page at the previously set communication speed. The receiving side, after transmitting the control channel data, receives the image data transmitted from the transmitting side at the previously set communication speed.

Next, the procedure shown in FIG. 5B will be described. On the transmission side, when the processing speed of the transmission data is not delayed with respect to the communication speed and the communication speed is not delayed with respect to the processing speed of the transmission data (that is, the communication speed change request is made. If not necessary), the Sh signal, the phase-inverted Sh signal, and the ALT signal are transmitted to the receiving side after a silent period of 70 ± 5 ms after transmitting one page of image data. The receiving side is S from the transmitting side.
When the h signal is detected, as a result of referring to the table data in FIG. 2, if the current communication speed is not set to the communication speed corresponding to the free space of the image memory 7, the PPh signal and the Send the ALT signal. That is,
This PPh signal becomes a communication speed change request signal from the receiving side to the transmitting side, and the PPh signal is received at the receiving side.
The signal transmission operation corresponds to the process of step S34 of FIG. Further, on the transmitting side, determining whether or not the PPh signal from the receiving side is detected corresponds to the processing of step S14 in FIG.

When the receiving side detects the Sh signal from the transmitting side and the current communication speed is set to an appropriate communication speed corresponding to the free space of the image memory 7,
The Sh signal is transmitted to the transmitting side. After that, a procedure different from the procedure shown in FIG. 5B is performed between the transmission side and the reception side, and the communication speed is not changed,
The image data of the next page is communicated.

When the transmitting side detects the PPh signal from the receiving side, it transmits the PPh signal and the ALT signal to the receiving side. When the receiving side detects the PPh signal from the transmitting side, it transmits the MPh signal to the transmitting side within a predetermined time. In addition, the transmitting side transmits the ALT signal for a predetermined time,
The MPh signal is transmitted to the receiving side.

When the transmitting side and the receiving side each detect at least one MPh signal from the other side, the E side signal is transmitted to the other side after the transmission of the MPh signal currently being transmitted is completed. Then, as in the case of FIG. 5A, the transmitting side and the receiving side each have the maximum data transmission rate shown in the MPh signal transmitted from themselves and the maximum data transmission rate shown in the MPh signal received from the other side. Based on the data transmission rate, the communication rate between the two is reset. This operation of resetting the communication speed is performed in step S1 of FIG.
3 and the process of step S35 of FIG. 4 are the same as in the case of FIG. The receiving side informs the transmitting side of the communication speed corresponding to the current free space of the image memory 7 as the maximum data transmission speed based on the table data of FIG.

After that, as in the case of FIG. 5A, after the control channel data is exchanged between the transmitting side and the receiving side, the image data of the next page is first reset. It is communicated at the communication speed.

Since the facsimile apparatus of this embodiment operates as described above, it has the following excellent effects. (1) At the time of transmitting image data, a speed required for processing from reading an image on a document to transmitting the read image data (that is, processing of transmission data) may be delayed from the communication speed, or When the communication speed delays the processing of the transmission data, the receiving side is requested to change the communication speed. Then, based on the request, the communication speed with the receiving side is reset to an appropriate speed. In this way, the communication speed change request is made to the reception side according to the processing status of the transmission data, and the communication speed with the reception side is reset. Therefore, it is possible to avoid the problem that the read image data cannot be reliably transmitted and the transmitted image data is lost, and the read image data can be reliably transmitted at the fastest speed.

(2) When receiving the image data, if it is determined that the current communication speed is not set to the proper communication speed corresponding to the free space of the image memory 7 based on the table data of FIG. Since it is highly possible that the processing of the received data will be hindered, the sender is requested to change the communication speed. In other words, the speed required for the processing from receiving the image data to printing (that is, the processing of the received data) is delayed with respect to the communication speed, or the communication speed is delayed with respect to the processing of the received data. When it occurs, the sender is requested to change the communication speed. Then, based on the request, the communication speed with the transmitting side is reset to an appropriate speed. In this way, the transmission side is requested to change the communication speed according to the processing status of the received data, and the communication speed with the transmission side is reset. Therefore, it is possible to avoid the problem that the received image data is lost due to the overflow of the image memory 7 and the reliable printing cannot be performed before the reception of the image data is completed, and the image data is reliably received at the highest speed. Can be printed.

(3) The receiving side should be able to easily judge whether or not to request the transmission side to change the communication speed based on the preset table data, and to request the transmitting side to reset. A proper communication speed can be easily determined.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. In the first embodiment, the communication speed is changed only between pages of communication data. On the other hand, in the second embodiment, the change of the communication speed is performed at an arbitrary timing during the communication of the image data for one page.

FIG. 6 is a flow chart showing the communication operation performed under the control of the CPU 1 when the facsimile apparatus of the second embodiment is the transmitting side. That is,
Following the processing of steps S1 to S8 of FIG. 3 in the first embodiment, it is determined whether the reading of one page of the document has been completed (step S41). If the reading of one page has not been completed, it is determined whether or not it is necessary to request the receiving side to change the communication speed (step S42). Here, when the processing speed of the transmission data is delayed with respect to the communication speed, or when the communication speed is delayed with respect to the processing speed of the transmission data, the communication speed is set to the reception side device. It is judged that it is necessary to request the change of. Then, after a request for changing the communication speed is made to the receiving side device (step S43), the communication speed with the receiving side device does not hinder the processing of the transmission data based on the request. The speed is reset to an appropriate speed (step S44).

Further, the judgment result of the step S42 is NO.
In this case, it is determined whether or not there is a request from the receiving side device to change the communication speed (step S45). Here, if there is a request from the receiving side device, the process proceeds to step S44, and the communication speed with the receiving side device is set to an appropriate speed that does not hinder the processing of the received data. Is set.

When the process of step S44 is completed, the process returns to step S41, and the transmission of the read image data is restarted at the reset communication speed. On the other hand, the step S
In 45, if there is no request from the receiving side device, the communication speed is not changed and the step S
Returning to step 41, the transmission of the read image data is continued at the currently set communication speed.

The above steps S42 to S45 are repeated until the reading of one page of the original is completed.
When the reading of one page of the original is completed in step S41, it is determined whether or not there is a next read original (step S46). If yes, the process returns to step S8 to read the next original. Is done. If there is no next read document, the transmission process ends.

FIG. 7 is a flow chart showing the communication operation performed under the control of the CPU 1 when the facsimile apparatus of the second embodiment is the receiving side. That is,
Steps S21 to S2 of FIG. 4 in the first embodiment.
Subsequent to the processing of 9, it is determined whether or not the image data for one page of the original document has been received (step S51). Here, if reception of one page of the manuscript has not been completed,
It is determined whether it is necessary to request the transmission side device to change the communication speed (step S52). This determination is made based on the table data of FIG. 2 as in the case of step S33 of FIG. If it is determined that the transmission side device needs to change the communication speed, the transmission side device is requested to change the communication speed (step S5).
3) Based on the request, the communication speed with the transmitting device is reset to an appropriate speed that does not hinder the processing of the received data (step S54).

Further, the judgment result of the step S52 is NO.
In this case, it is determined whether or not there is a request from the transmitting side device to change the communication speed (step S55). Here, if there is a request from the transmission side device, the process proceeds to step S54, and the communication speed with the transmission side device is set to an appropriate speed that does not hinder the processing of the transmission data. Is set.

When the process of step S54 is completed, the process returns to step S51, and the reception of the image data is restarted at the reset communication speed. On the other hand, in step S55
If there is no request from the sending device,
The communication speed is not changed and the step S51 is performed as it is.
Then, the reception of the image data is continued at the currently set communication speed.

The operations of steps S52 to S55 are repeated until the reception of one page of the original document is completed. When the reception of one page of the original is completed in step S51, it is determined whether or not there is received image data of the next page (step S56). If there is, the process returns to step S28 and the next page is read. Image data is received. If there is no received image data for the next page, the process ends when all the received image data in the image memory 7 have been printed (step S57).

FIG. 8A shows a procedure in which the transmitting side requests the receiving side to change the communication speed. FIG. 8B
Shows a procedure in which the receiving side requests the transmitting side to change the communication speed.

First, the procedure shown in FIG. 8A will be described. If the processing speed of the transmission data is delayed with respect to the communication speed, or if the communication speed is delayed with respect to the processing speed of the transmission data, the transmission side transmits the image data to the page. Suspended on the way, 70 ± 5m
After a silent period of s, the B signal as a tone signal is transmitted to the receiving side. Then, this B signal becomes a communication speed change request signal from the transmitting side to the receiving side, and the transmitting operation of this B signal on the transmitting side corresponds to the processing of step S43 in FIG. On the receiving side, determining whether or not the B signal from the transmitting side is detected corresponds to the process of step S55 in FIG.

When the receiving side detects the B signal from the transmitting side for a predetermined time, it transmits the A signal as a tone signal and the phase-inverted A signal to the transmitting side after a silent period of 70 ± 5 ms. When the transmitting side detects the A signal and the phase-inverted A signal from the receiving side, the transmitting side transmits the phase-inverted B signal to the receiving side after a predetermined time elapses from the detection of the phase-inverted A signal. Then, the transmitting side transmits the L1 signal and the L2 signal as probing signals to the receiving side.

The receiving side receives the phase-inverted B from the transmitting side.
After detecting the signal, the L1 signal and the L2 signal from the transmitting side are received. After that, the receiving side transmits the signal A to the transmitting side. When the transmitting side detects the A signal from the receiving side, it transmits the B signal to the receiving side. Also, the receiving side
When the B signal from the transmitting side is detected, INF
The Oh signal is transmitted to the transmitting side. Upon receiving the INFOh signal from the receiving side, the transmitting side transmits the S signal, the phase-inverted S signal, and the PP signal to the receiving side after a silent period of 70 ± 5 ms. Then, the transmitting side transmits the TRN signal to the receiving side. The receiving side detects the S signal and the phase-inverted S signal from the transmitting side, receives the PP signal and the TRN signal from the transmitting side, and uses the PP signal and the TRN signal to train the modem 5. .

Thereafter, a procedure similar to the procedure shown in FIG. 5A is performed between the transmitting side and the receiving side to reset the communication speed. The operation of resetting the communication speed performed during the procedure shown in FIG. 5A is performed in step S4 of FIG.
4 and the process of step S54 of FIG. 7. After that, the communication of the image data is
It resumes at the previously set communication speed.

Next, the procedure shown in FIG. 8B will be described. When the receiving side determines that it is necessary to request the transmission side to change the communication speed based on the table data in FIG. 2, the A signal as a tone signal is transmitted to the transmitting side after a silent period of 70 ± 5 ms. Send to. Then, this A signal becomes a communication speed change request signal from the receiving side to the transmitting side, and the transmitting operation of this A signal on the receiving side corresponds to the processing of step S53 in FIG.
Further, on the transmitting side, it is possible to judge whether or not the A signal from the receiving side is detected in step S45 of FIG.
Corresponds to the processing of

When the transmitting side detects the A signal from the receiving side for a predetermined time, the transmission of the image data is interrupted in the middle of the page, and the B signal as the tone signal is sent to the receiving side after a silent period of 70 ± 5 ms. To send. When the receiving side detects the B signal from the transmitting side, it transmits the phase-inverted A signal to the transmitting side. When the transmitting side detects the phase-inverted A signal from the receiving side, the phase-inverted B signal is transmitted to the receiving side a predetermined time after the detection.

Thereafter, between the transmitting side and the receiving side, the same procedure as the above-mentioned procedure shown in FIG. 8A is performed, and thereafter, the same procedure as the procedure shown in FIG. 5B is performed. Then, the communication speed is reset. This figure 5
The operation of resetting the communication speed performed during the procedure shown in (b) corresponds to the processing of step S44 of FIG. 6 and step S54 of FIG. After that, the communication of the image data is restarted between the transmission side and the reception side at the communication speed reset previously.

Since the above-described operation is performed in the second embodiment, the following excellent effect is obtained in addition to the effect of the first embodiment. (1) The communication speed change request and the resetting are performed at an arbitrary timing during the communication of one page of image data. Therefore, the communication speed with the other party can be changed more finely according to the processing status of the transmission data and the processing status of the reception data.

The second embodiment can be modified as follows. In the second embodiment, the request for changing the communication speed to the other party is made according to the procedure shown in FIGS. 8 (a) and 8 (b). On the other hand, in this modification, the communication speed change request to the other party is made in accordance with the procedure shown in FIGS. 9 (a) and 9 (b).

FIG. 9A shows a procedure in which the transmitting side requests the receiving side to change the communication speed. FIG. 9B
Shows a procedure in which the receiving side requests the transmitting side to change the communication speed.

First, the procedure shown in FIG. 9A will be described. When it is necessary to request the change of the communication speed, the transmission side interrupts the transmission of the image data in the middle of the page and transmits the S signal and the phase-inverted S signal to the reception side. Then, this S signal becomes a communication speed change request signal from the transmission side to the reception side, and the transmission operation of this S signal is performed at the transmission side at step S4 in FIG.
This corresponds to the processing of 3. Further, on the receiving side, determining whether or not the S signal from the transmitting side is detected corresponds to the processing of step S55 in FIG.

The transmitting side further transmits the TRN signal and the MP signal to the receiving side. The receiving side detects the S signal from the transmitting side, and then detects the S signal, the phase-inverted S signal, and the TR signal.
The N signal and the MP signal are transmitted to the transmitting side. The MP signal transmitted from each of the transmitting side and the receiving side includes data indicating the maximum data transmission rate allowed by itself, as in the case of the MPh signal described in FIG. When the transmitting side and the receiving side each detect at least one MP signal from the other side, the MP 'signal is transmitted to the other side after the transmission of the MP signal currently being transmitted is completed. When the transmitting side and the receiving side each detect at least one MP 'signal from the other side, the E side signal is transmitted to the other side after the transmission of the MP' signal currently being transmitted is completed. Then, the transmission side and the reception side each have a communication speed between them based on the maximum data transmission rate shown in the MP signal transmitted from themselves and the maximum data transmission rate shown in the MP signal received from the other side. Reset. This communication speed is
Of the maximum data transmission rates indicated in the signal, it is set to the slower rate. The operation of resetting the communication speed corresponds to the processing of step S44 in FIG. 6 and step S54 in FIG.

Further, the transmitting side and the receiving side respectively transmit the E signal and then transmit the B1 signal to the other side, and also receive the E signal and the B1 signal from the other side. The transmitting side transmits the image data after transmitting the B1 signal.
Restart at the previously set communication speed. After transmitting the B1 signal, the receiving side receives the image data transmitted from the transmitting side at the previously set communication speed.

Next, the procedure shown in FIG. 9B will be described. When the receiving side determines that it is necessary to request the transmission side to change the communication speed based on the table data of FIG. 2, the receiving side transmits the S signal and the phase-inverted S signal to the transmitting side. . Then, the S signal becomes a communication speed change request signal from the receiving side to the transmitting side, and the transmitting operation of the S signal on the receiving side corresponds to the process of step S53 in FIG. Further, on the transmitting side, determining whether or not the S signal from the receiving side is detected corresponds to the processing of step S45 in FIG.

The receiving side further transmits the TRN signal and the MP signal to the transmitting side. After detecting the S signal from the transmission side, the transmission side interrupts the transmission of image data in the middle of the page and transmits the S signal, the phase-inverted S signal, the TRN signal, and the MP signal to the reception side. To do.

After that, the procedure similar to the procedure shown in FIG. 9A is performed between the transmitting side and the receiving side to reset the communication speed. This communication speed reset operation is
This corresponds to the processing of step S44 of FIG. 6 and step S54 of FIG. After that, the communication of the image data is restarted between the transmission side and the reception side at the communication speed reset previously.

In the procedure of the modification shown in FIG. 9, the procedure for requesting and resetting the communication speed is simpler than the procedure shown in FIG. Therefore, when complete resynchronization between the transmitting side and the receiving side is not required, it is effective to perform the procedure of the modified example shown in FIG.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIGS. FIG.
9 is a flowchart showing a communication operation performed under the control of the CPU 1 when the facsimile apparatus of the third embodiment is the receiving side. That is, step S of FIG.
Subsequent to the processing of 21 and S22, it is judged whether or not the free space of the image memory 7 is equal to or larger than a predetermined amount (for example, 128 Kbytes) (step S61). Here, when the amount is equal to or more than the predetermined amount, the V. After the 34 functions are set (step S62), the process proceeds to step S23 of FIG. 4, and the same operation as that of the first or second embodiment, that is, the operation shown in FIG. 4 or 7 is performed.

On the other hand, if the free space of the image memory 7 is not equal to or larger than the predetermined amount, the process proceeds to step S63. Then, in step S63, the V. Without the 34 functions being set, the process proceeds to step S64. Step S
64 is V. 8 communication procedure is executed, but in the previous step V.8. 34 function has not been set, the V.34 function is set in the next step S65. The communication procedure is executed using a modulation scheme that matches with the other than the 34 communication procedures.

That is, when the free space of the image memory 7 is not more than the predetermined amount before the start of the reception of the image data, the free space of the image memory 7 is small from the beginning, and hence the communication speed at the time of receiving the image data thereafter is reduced. It is judged that the speed cannot be increased. Then, the communication speed of the image data is V. Reception is performed in a slower manner than in the case of 34 communication.
As described above, when it is considered that the communication speed cannot be increased, the V. It is also possible to execute other communication procedures without executing the 34 communication procedures.

The third embodiment shown in FIG. 10 may be modified as shown in FIG. In the modification shown in FIG. 11, the operation when the free space of the image memory 7 is equal to or larger than a predetermined amount in step S61 described above is the same as the case of FIG. On the other hand, if the free space of the image memory 7 is not more than the predetermined amount, the ITU-T
Recommendation T. 30 functions are set (step S7)
1). And V. 8 Communication procedure is not executed,
T. The communication procedure according to the 30 procedure is executed (step S72).

That is, also in this modified example, when the free space of the image memory 7 is not more than the predetermined amount before the start of receiving the image data, the communication speed of the image data is V.70. Reception is performed in a slower manner than in the case of 34 communication. In particular, in this modification, the communication procedure is T. Since it is fixed at 30 steps,
V. 8 Communication procedure is not executed. Even in this case, the communication with the transmitting side will not be hindered.

The present invention may be modified and embodied as follows, for example. (1) Instead of the electrophotographic printer, the recording unit 9 may be a printer such as a printer using a thermal head or an inkjet printer.

(2) The contents of the table data shown in FIG. 2 are merely examples, and may be freely changed. V. 3
In the four-communication procedure, since the communication speed can be set in 14 steps, for example, table data may be created by allocating the free space of the image memory 7 in correspondence with the 14-step communication speed. By doing so, the communication speed can be changed more finely.

(3) Combining the first and second embodiments. That is, the communication speed should be changed both between pages of communication data and during communication of image data for one page.

The technical idea which can be understood from the above-mentioned embodiment will be described below. (1) The communication terminal device according to claim 1, wherein the received data processing means performs processing from receiving data to printing.

(2) The received data processing means includes a storage means for storing the received data, a decoding means for decoding while reading the data in the storage means at the time of receiving the data, and a print on the recording paper based on the decoded data. The communication terminal device according to claim 1 or (1), further comprising: recording means for performing the request, and the requesting means requests the transmission side to change the communication speed according to the free space of the storage means. By doing so, it is possible to avoid the problem that the storage means overflows before the data reception is completed and the received data is lost.

(3) If the free space of the storage means is not equal to or more than a predetermined amount before the start of data reception, the subsequent data reception is performed by a procedure other than the high-speed communication procedure. Item 2. The communication terminal device according to item 2.

(4) The communication terminal device according to claim 4, wherein the transmission data processing means performs a process from reading an image on a document to transmitting the read data. (5) The transmission data processing means includes a reading means for reading an image on a document and an encoding means for encoding the read image data, and the request means is a reading processing speed of the reading means or an encoding means. 5. The communication terminal device according to claim 4 or (4), wherein when the encoding processing speed of 1 is delayed from the communication speed or vice versa, the receiving side is requested to change the communication speed. . By doing so, it is possible to avoid the problem that the read image data cannot be reliably transmitted and the transmitted image data is lost.

(6) The communication terminal device according to any one of claims 1 to 4, wherein the requesting unit requests a change in communication speed between pages of communication data. (7) The communication terminal device according to any one of claims 1 to 4, wherein the requesting unit requests a change in communication speed during communication of data for one page.

[0093]

As described above in detail, the present invention has the following excellent effects. Claims 1 and 5
According to the invention, it is possible to change the communication speed to an appropriate one according to the processing status of the received data, and it is possible to reliably receive the data at the highest possible speed.

According to the second aspect of the invention, it is possible to avoid the problem that the storage means overflows before the data reception is completed and the received data is lost. According to the third aspect of the present invention, it is possible to easily determine whether or not to make a communication speed change request and reset the communication speed based on preset table data.

According to the inventions of claims 4 and 5, it is possible to change the communication speed to an appropriate one in accordance with the processing status of the transmission data, and it is possible to reliably transmit the data at a speed as high as possible.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of a facsimile apparatus according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing table data.

FIG. 3 is a flowchart showing an operation during facsimile transmission.

FIG. 4 is a flowchart showing an operation at the time of facsimile reception.

5A is an explanatory diagram showing a procedure in which the transmitting side requests the receiving side to change the communication speed, and FIG. 5B is an explanatory diagram showing a procedure in which the receiving side requests the transmission side to change the communication speed. Fig.

FIG. 6 is a flowchart showing an operation during facsimile transmission of the second embodiment.

FIG. 7 is a flowchart showing an operation when receiving a facsimile according to the second embodiment.

FIG. 8A is an explanatory diagram showing a procedure in which the transmission side requests the reception side to change the communication speed, and FIG. 8B shows a procedure in which the reception side requests the transmission side to change the communication speed. Fig.

FIG. 9 shows a modified example of the second embodiment,
(A) is an explanatory view showing a procedure in which the transmission side requests the reception side to change the communication speed, and (b) is an explanatory view in which the reception side requests the transmission side to change the communication speed.

FIG. 10 is a flowchart showing an operation at the time of facsimile reception of the third embodiment.

FIG. 11 shows a modified example of the third embodiment,
6 is a flowchart showing an operation when receiving a facsimile.

[Explanation of symbols]

1 ... CPU configuring request means and speed setting means, 2 ...
ROM forming requesting means and speed setting means, 3 ... RAM forming requesting means and speed setting means, 5 ... Modem forming requesting means and speed setting means, 6 ... Reading section forming transmission data processing means, 7 ... an image memory forming the reception data processing means, 8 ... a codec forming the transmission data processing means and the reception data processing means, 9 ... a recording unit forming the reception data processing means.

Claims (5)

[Claims] 1. A communication terminal device having a function capable of changing a communication speed during data communication, the received data processing means for processing received data, and communication to a transmitting side according to a processing status of the processing means. A communication terminal device comprising requesting means for requesting a change in speed and speed setting means for resetting a communication speed with a transmitting side based on the request. 2. The reception data processing means includes a storage means for storing the reception data and a recording means for printing on a recording paper based on the data in the storage means when the data is received, and the requesting means stores the data. The communication terminal device according to claim 1, wherein the communication terminal device requests the transmission side to change the communication speed according to the available capacity of the means. 3. A table data setting relationship between the free space of the storage means and the communication speed is provided, and the requesting means judges whether to request the transmission side to change the communication speed based on the table data. The communication terminal device according to claim 2, wherein the speed setting unit resets the communication speed with the transmission side based on the table data. 4. A communication terminal device having a function capable of changing a communication speed during data communication, the transmission data processing means for processing transmission data, and communication to a receiving side according to a processing status of the processing means. A communication terminal device comprising requesting means for requesting a speed change and speed setting means for resetting a communication speed with a receiving side based on the request. 5. A communication method capable of changing the communication speed during data communication, wherein the communication partner is requested to change the communication speed according to the processing status of the transmission data or the processing status of the reception data, and communication is performed. A communication method that resets the communication speed with the other party.