JP5879797B2 - Facsimile machine - Google Patents

Description

  The present invention relates to a facsimile machine.

  Conventionally, techniques relating to facsimile apparatuses have been proposed (see, for example, Patent Document 1 and Patent Document 2). In the facsimile apparatus of Patent Document 1, a destination transmission mode is stored for each destination, and image information is encoded by an encoding method corresponding to the destination transmission mode and stored in an image memory. In the facsimile apparatus, when it is detected that the destination transmission mode is changed in the pre-transmission procedure, the transmission procedure is temporarily terminated at that point, and the destination transmission mode corresponding to the destination is updated and stored in the image memory. The encoded image information is encoded again by an encoding method corresponding to the updated destination transmission mode. When a new destination is selected, the image information is encoded and stored in the image memory with the default value set in the standard mode.

  In the facsimile apparatus of Patent Literature 2, the image information encoding method, the image information data transmission rate, and the communication fee per unit time of the transmission destination facsimile apparatus are stored for each transmission destination. In the facsimile apparatus, the transmission time required to transmit the image information is calculated based on the data amount of the image information stored in the image memory, the encoding method and the data transmission speed, and the transmission time and the unit time per unit time are calculated. The communication fee required for image information transmission is calculated on the basis of the communication fee and the communication fee is displayed before the image information transmission is started. In addition, a bandwidth securing type data communication service using a telephone number starting from an area code is provided (see, for example, Non-Patent Document 1). NGN is used for this service.

JP-A 61-262364 JP-A-64-37165

East Nippon Telegraph and Telephone Corporation, “Providing“ Data Connect ”, a Bandwidth-Reserved Data Communication Service Using News Release“ Hikari Telephone ”and“ Hikari Telephone Number Gate ”for Realizing Large Capacity and Multi-Channel Communications” , [Online], May 31, 2010, [Search June 28, 2011], Internet <http://www.ntt-east.co.jp/release/detail/20100531_05.html>

  By the way, when performing facsimile communication with a facsimile apparatus (destination apparatus) serving as a transmission destination, the transmission source facsimile apparatus transmits image data corresponding to the read original in an encoded format. At this time, the encoding method used for facsimile transmission is negotiated between the transmission source facsimile apparatus and the partner apparatus. The transmission facsimile apparatus generates encoded image data encoded by the encoding method determined by the negotiation and transmits it. Here, memory transmission is one of the methods for transmitting encoded image data.

  The problem to be solved will be described by taking as an example memory transmission when monochrome transmission is selected in the transmission facsimile apparatus. As an encoding method in the case of monochrome transmission, for example, MMR, MR, and MH are employed in descending order of compression rate. In some cases, a coding system based on JBIG is adopted. In the memory transmission, a series of processes such as reading a document, encoding with a high compression ratio such as MMR, and storing (accumulating) encoded image data in a predetermined storage area are performed. Negotiation is performed in a state where encoded image data for all pages is stored. As a result of the negotiation, if the partner apparatus is a facsimile apparatus that does not support MMR, the transmission source facsimile apparatus decodes the encoded image data in the MMR format, and the decoded image data is received by the partner apparatus. Re-encoding is performed using an encoding method that can be received. Thereafter, the re-encoded encoded image data is transmitted. Thus, when re-encoding is executed in memory transmission, the time required for processing becomes longer. For example, when the band securing data communication service as described above is used, the merit of high-speed communication is lost. The communication bandwidth (communication speed) in the bandwidth reservation type data communication service using NGN is about 64 kbps, 512 kbps, and 1000 kbps (1 Mbps).

  SUMMARY OF THE INVENTION An object of the present invention is to provide a facsimile apparatus capable of suitably generating encoded image data that can be received by a counterpart apparatus and performing suitable facsimile transmission.

  One aspect of the present invention made in view of the above-described conventional problems is that the encoded image data obtained by encoding the image data corresponding to the read document is transmitted to the partner apparatus connected to the bandwidth securing type IP network. A facsimile apparatus that performs facsimile transmission via an IP network, wherein a first compression having a compression rate lower than a second compression rate from a reading unit that reads a document and image data corresponding to the document read by the reading unit First type encoded image data encoded by the first type encoding method of the rate, and second type encoded image encoded by the second type encoding method of the second compression rate A first storage unit that stores first type encoded image data and second type encoded image data generated by the generation unit, and a first unit by the generation unit. Kind of encoded image data is generated In this case, the first type encoded image data is stored in the first storage unit, and when the second type encoded image data is generated by the generation unit, the second type encoded image data is stored in the first type. A storage control unit, a communication unit connected to the IP network, a communication control unit for controlling the communication unit, destination information corresponding to the destination device, and the destination device can receive the data stored in the storage unit As a coding method of the coded image data, a second storage unit that stores coding information in which the first type coding method or the second type coding method is associated, and a communication band used for facsimile transmission According to the encoding information stored in the second storage unit and the band setting unit that sets the first communication band that is faster than the second communication band or the second communication band. Said fax for facsimile transmission A first determination unit that determines whether the first-type encoding method or the second-type encoding method is associated with the input destination information input to the apparatus, and the generation When the first determination unit determines that no encoding method is associated with the input destination information, the first determination unit generates first type encoded image data; In the first case, the band setting unit sets the communication band to the first communication band, and the communication control unit controls the communication unit in the first case, and the input has been completed. The band setting unit sets the first type encoded image data generated by the generation unit and stored in the first storage unit by the storage control unit in the destination device corresponding to the destination information. Facsimile device for facsimile transmission in the first communication band It is.

  According to this, in the first case described above, the first type encoded image data encoded by the first type encoding method having a low compression rate and the first type communication band having a high communication band. Facsimile transmission can be realized in combination with That is, when the data capacity is increased due to low compression, it is possible to use the first type of communication band with a high communication band, and the communication time for facsimile transmission can be shortened. By the way, regarding the encoding method of the encoded image data to be transmitted, a method with a low compression rate is supported by many existing facsimile apparatuses, and therefore re-encoding can be avoided. Therefore, processing time for re-encoding is not necessary, and communication time for facsimile transmission can be shortened.

  This facsimile apparatus can also be configured as follows. The generation unit is a second unit that is determined by the first determination unit that the input destination information is associated with the first type encoding method or the second type encoding method. The first type encoded image data or the second type code encoded by the first type encoding method or the second type encoding method associated with the input destination information. The bandwidth setting unit sets the communication band to the first communication band in the second case, and the communication control unit sets the communication unit to the second case. The first type encoded image data generated by the generation unit and stored in the first storage unit by the storage control unit or the first type of encoded image data or the first destination device corresponding to the input destination partner information. Two types of encoded image data are stored in the first communication band set by the band setting unit. Facsimile transmission, may be. According to this, in the second case described above, facsimile transmission can be realized by a combination of the encoded image data that can be received by the counterpart device and the first type of communication band having a high communication band. That is, the communication time for facsimile transmission can be shortened by avoiding re-encoding and setting the high-speed first type communication band.

  In the facsimile apparatus, the generation unit measures a first time required to generate the second type of encoded image data from the image data corresponding to the document read by the reading unit; A capacity acquisition unit that acquires the data capacity of the second type of encoded image data generated by the generation unit and stored in the first storage unit by the storage control unit; Corresponding time information that defines the correspondence between one hour and the second time required to decode the second type of encoded image data and generate the first type of encoded image data from the decoded image data. A third storage unit for storing, a time acquisition unit for acquiring a second time corresponding to the first time measured by the time measuring unit in accordance with the corresponding time information stored in the third storage unit, and the capacity acquisition Data capacity acquired in the department and the time A speed acquisition unit for acquiring a reference communication speed from a second time acquired by the communication unit, and a capability signal received by the communication unit by the communication control unit, corresponding to the input destination information An information acquisition unit that acquires reception capability information for an encoding method of encoded image data that can be received by the counterpart device from a capability signal from the counterpart device, and a reception capability acquired by the information acquisition unit A second determination unit that determines an encoding method of encoded image data that can be received by the destination device corresponding to the input destination information according to the information; and an operation mode of the facsimile device is a first type mode, Or a mode setting unit for setting to any one of the second type modes, and the generation unit is the first determination unit, and the input destination information includes any encoding method. Associated In the third case where the operation mode of the facsimile apparatus is determined to be the first type mode in the mode setting unit, first type encoded image data is generated, and In the first determination unit, it is determined that no encoding method is associated with the input destination information, and the operation mode of the facsimile apparatus is changed to a second type in the mode setting unit. In the fourth case set to the mode, the second type encoded image data is generated, and the second type encoded image data is generated in the generation unit in the fourth case, and the storage control unit In the first storage unit, and in the second determination unit, the counterpart device corresponding to the inputted counterpart information does not correspond to the second type encoding method, Judged to be compatible with the first type of encoding method. In the fifth case, the second type encoded image data stored in the first storage unit is decoded, the first type encoded image data is generated from the decoded image data, and the band setting unit In the third case, the communication band is set to the first communication band, and in the fifth case, the communication band is less than or less than the reference communication speed acquired by the speed acquisition unit. The first communication band or the second communication band is set, and the communication control unit controls the communication unit in the third case, and corresponds to the input destination information. In the apparatus, the first type encoded image data generated by the generation unit and stored in the first storage unit by the storage control unit is transmitted in the first communication band set by the band setting unit. Facsimile transmission, in the fifth case, the communication unit is controlled and the input completed The band setting unit sets the first type encoded image data generated by the generation unit and stored in the first storage unit by the storage control unit in the destination device corresponding to the other party information. Facsimile transmission may be performed in the first communication band or the second communication band.

  According to this, in the third case described above, the same facsimile transmission as that in the first case already described can be realized. The description regarding this point is omitted. In the fifth case described above, the communication band corresponding to the time required for re-encoding, such as decoding the second type encoded image data and encoding the first type encoded image data, is used for facsimile transmission. It can be set as a communication band. That is, it is possible to prevent an unnecessarily high-speed communication band from being set as a communication band used for facsimile transmission. Facsimile transmission corresponding to a plurality of patterns can be made compatible. It should be noted that when the charge amount for facsimile transmission becomes higher as the higher-speed communication band is used, such a facsimile apparatus is preferable because the charge amount can be suppressed.

  According to another aspect of the present invention, encoded image data obtained by encoding image data corresponding to a read document is transmitted to a partner apparatus connected to a bandwidth-reserved IP network via the IP network. A first type code of a first compression rate that is lower than a second compression rate from a reading unit that reads a document and image data corresponding to the document read by the reading unit Of generating first type encoded image data encoded by the encoding method and second type encoded image data encoded by the second type encoding method of the second compression rate A first storage unit storing the first type encoded image data and the second type encoded image data generated by the generation unit, and the first type encoded image data generated by the generation unit. If generated, the first kind of encoded image Storage control, wherein when the second type encoded image data is generated by the generating unit, the second type encoded image data is stored in the first storage unit. Unit, a communication unit connected to the IP network, a communication control unit for controlling the communication unit, counterpart information corresponding to the counterpart device, and encoding method of encoded image data that can be received by the counterpart device A second storage unit that stores encoding information in association with the first type encoding method or the second type encoding method, and a communication band used for facsimile transmission from a second communication band The facsimile is set for facsimile transmission in accordance with the band setting unit for setting either the first communication band which is high speed or the second communication band, and the encoded information stored in the second storage unit. Entered on the device A first determination unit that determines whether the first-type encoding method or the second-type encoding method is associated with destination information, and a document that the generation unit has read by the reading unit Is generated from the image data corresponding to the first time required to generate the second type of encoded image data, and generated by the generator, and stored in the first memory by the storage controller A capacity acquisition unit that acquires the data capacity of the stored second type encoded image data, the first time measured by the time measuring unit, and the second type encoded image data are decoded and decoded image A second time required to generate the first kind of encoded image data from the data, a third storage unit that stores corresponding time information that defines a correspondence between the second time and the corresponding time stored in the third storage unit Corresponds to the first time measured by the timekeeping unit according to the information A time acquisition unit for acquiring a second time, a data capacity acquired by the capacity acquisition unit, and a second time acquired by the time acquisition unit, a speed acquisition unit for acquiring a reference communication speed, Encoding of encoded image data that can be received by the counterpart device from the capability signal from the counterpart device corresponding to the inputted counterpart information, which is the capability signal received by the communication unit by the communication control unit An information acquisition unit that acquires reception capability information for a system, and encoded image data that can be received by a destination device corresponding to the input destination information in accordance with the reception capability information acquired by the information acquisition unit A second determination unit that determines the encoding method of the first determination unit, wherein the generation unit is determined by the first determination unit that no encoding method is associated with the input destination information. First place The second type encoded image data is generated, and the second type encoded image data is generated by the generation unit in the first case, and is stored in the first storage unit by the storage control unit. In addition, in the second determination unit, the counterpart device corresponding to the input counterpart information does not correspond to the second type encoding method, and corresponds to the first type encoding method. In the sixth case, the second type encoded image data stored in the first storage unit is decoded, and the first type encoded image data is generated from the decoded image data. In the sixth case, the band setting unit is configured to set the communication band to the first communication band or the second communication band that is equal to or lower than the reference communication speed acquired by the speed acquisition unit. The communication control unit controls the communication unit in the sixth case, and The first set of encoded image data generated by the generation unit and stored in the first storage unit by the storage control unit is transmitted to the counterpart device corresponding to the already-destination destination information by the band setting unit. A facsimile apparatus that performs facsimile transmission in the set first communication band or the second communication band.

  According to this, in the sixth case described above, the same facsimile transmission as in the fifth case already described can be realized. The description regarding this point is omitted. In any of the above-described facsimile apparatuses, the first storage unit and the second storage unit, or the first storage unit, the second storage unit, and the third storage unit are respectively separated by separate storage units in terms of hardware. Although it may be configured, for example, it may be configured by one storage unit. Note that any two storage units may be configured by one storage unit in terms of hardware, and the remaining one storage unit may be a separate storage unit.

  ADVANTAGE OF THE INVENTION According to this invention, the facsimile apparatus which can produce | generate suitably the encoded image data which can be received by the other party apparatus, and can perform suitable facsimile transmission can be obtained.

1 is a block diagram illustrating an example of a facsimile communication system and an example of a hardware configuration of a facsimile apparatus. (A) is a figure which shows an example of an encoding information table. (B) is a diagram showing an example of an abbreviated dial table including an association between a dial number and an encoding method. (C) is a figure which shows an example of a corresponding | compatible time information table. (D) is a figure which shows an example of a communication band table. It is a flowchart (the 1) of a FAX transmission process. It is a flowchart (the 2) of a FAX transmission process. It is a flowchart of a 1st kind mode process. (A) is a figure which shows an example of SDP of an INVITE message. (B) is a figure which shows an example of SDP of a 200OK message. It is a flowchart of a 2nd type mode process. It is a flowchart of a high compression encoding process. It is a flowchart of a communication band setting process. It is a flowchart of an other party corresponding | compatible process.

  Embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to the configurations described below, and various configurations can be employed in the same technical idea. For example, some of the configurations shown below may be omitted or replaced with other configurations. Moreover, you may make it include another structure.

<Facsimile communication system>
A facsimile communication system (hereinafter referred to as “FAX communication system”) 1 will be described with reference to FIG. A FAX communication system 1 shown in FIG. 1 is constructed by a next generation network (NGN (Next Generation Network), hereinafter referred to as “NGN”) network 3. Specifically, the FAX communication system 1 is based on a bandwidth reservation type data communication service using a telephone number starting from an area code (hereinafter referred to as “dial number”) as shown in Non-Patent Document 1, for example. Built. That is, the FAX communication system 1 is constructed by a bandwidth-reserved data communication service already provided by East Nippon Telegraph and Telephone Corporation and West Nippon Telegraph and Telephone Corporation. This bandwidth-reserved data communication service is called Data Connect (registered trademark). Since the bandwidth reservation type data communication service using the NGN network 3 is a technology that has already been put into practical use, description thereof is omitted.

  As shown in FIG. 1, the FAX communication system 1 includes at least a facsimile apparatus (hereinafter referred to as “FAX apparatus”) 10 as a transmission source and a facsimile apparatus (hereinafter referred to as “destination apparatus” as a transmission destination (reception side). 50). Further, the FAX communication system 1 includes a SIP (Session Initiation Protocol) server 80. The FAX apparatus 10, the partner apparatus 50, and the SIP server 80 are connected to the NGN network 3. The SIP server 80 stores the IP address of the FAX apparatus 10 and SIP URI (SIP Uniform Resource Identifier) in association with each other, and stores the IP address and SIP URI of the partner apparatus 50 in association with each other. The SIP server 80 controls communication between the FAX apparatus 10 and the counterpart apparatus 50 using SIP. T.A. In 38 FAX communication, various signals (commands) based on the procedure according to SIP between the FAX apparatus 10 and the partner apparatus 50 are transmitted and received via the SIP server 80. In addition, the FAX communication system 1 includes an exchange 90. The FAX apparatus 10 and the partner apparatus 50 are also connected to a public switched telephone network (PSTN (hereinafter referred to as “PSTN”)) 5 constituted by an exchange 90. Since the exchange 90 has a configuration that has already been put into practical use, the description thereof is omitted.

<FAX machine>
The FAX apparatus 10 is a T.D. It has a function for performing 38-based IPFAX (Internet Protocol FAX, hereinafter referred to as “T.38FAX”) communication and general FAX communication. T. T. et al. 38 is a transmission control protocol for performing G3 FAX communication using the IP protocol. T. T. et al. The 38 FAX communication communicates (transmits / receives) encoded image data (hereinafter referred to as “encoded image data”) via the NGN network 3 using SIP URI. In general FAX communication, encoded image data is communicated via the PSTN 5. T. T. et al. In 38 FAX communication and general FAX communication, a dial number is used as destination information corresponding to the destination device 50. As a dial number, for example, 0ABJ, E.I. The 164 format is exemplified and assigned from East Nippon Telegraph and Telephone Corporation and West Nippon Telegraph and Telephone Corporation. The FAX apparatus 10 is a T.D. The encoded image data can be transmitted to the counterpart apparatus 50 (hereinafter referred to as “T.38 FAX transmission”) by 38 FAX communication. The FAX apparatus 10 can transmit the encoded image data to the counterpart apparatus 50 (hereinafter referred to as “general FAX transmission”) by general FAX communication. The FAX apparatus 10 supports color and monochrome transmission.

  As shown in FIG. 1, the FAX apparatus 10 includes a display unit 12, an operation unit 14, a reading unit 16, a printing unit 18, a network interface (network I / F) 20, and a PSTN interface (PSTN I / F). ) 22 and a time measuring unit 24. The FAX apparatus 10 includes a CPU 30, a program ROM 32, a RAM 34, and a flash ROM 36. These units 12 to 36 are connected to the bus line 26. The display unit 12 is a display for displaying various information. The operation unit 14 includes a plurality of keys. The operation unit 14 includes a numeric keypad such as 0-9, a speed dial key, a start key, a selection key, a stop key, and the like. The numeric keypad and the abbreviated dial key are pressed, for example, when inputting a dial number. The start key is T. Pressed when performing 38 FAX transmission or general FAX transmission. For example, when monochrome transmission is performed to the counterpart device 50, a start key for monochrome transmission is pressed. The selection key is pressed when selecting a predetermined option. For example, it is used when a desired dial number is selected from dial numbers corresponding to a destination apparatus 50 registered in an address book database described later. A dial number can also be input by selecting a desired dial number using a selection key. The stop key is pressed when stopping the started process or operation. The user can input various instructions to the FAX apparatus 10 by operating keys associated with various processes constituting the operation unit 14.

  The reading unit 16 reads a document. The printing unit 18 prints an image corresponding to the encoded image data received by the FAX apparatus 10 on a recording sheet. The network I / F 20 is connected to the NGN network 3 and connects the FAX apparatus 10 to the NGN network 3. The PSTN I / F 22 is connected to the PSTN 5 and connects the FAX apparatus 10 to the PSTN 5. The timer unit 24 measures the passage of time. The timer unit 24 is, for example, a clock or a timer. CPU30 performs arithmetic processing. The program ROM 32 stores computer programs for various processes and the like as will be described later based on FIGS. 3 to 5 and 7 to 10. The RAM 34 is a storage area used when the CPU 30 executes various computer programs. The RAM 34 is used in an area for storing an input dial number, an area for a connection flag indicating whether or not SIP connection is possible, a variable I area, a bandwidth (S) area, and other processes described later. An area for information (data) is secured. The CPU 30 controls the FAX apparatus 10 by executing various computer programs stored in the program ROM 32. As a result, the FAX apparatus 10 executes various processes and implements various functions.

The flash ROM 36 stores various data. Various data, for each predetermined memory area of the flash ROM 36, respectively, are stored. For example, the flash ROM 36 stores an address book database in which dial numbers and the like corresponding to the partner device 50 are registered in association with the partner device 50 and the domain name of the SIP server 80. The user registers the dial number and the like of the receiving FAX apparatus including the partner apparatus 50 in the address book database via the operation unit 14 and stores the domain name of the SIP server 80. In this embodiment, it is assumed that the domain name of the SIP server 80 is “sipuri.com”. The flash ROM 36 stores settings relating to a facsimile transmission communication method to be prioritized by the FAX apparatus 10. Specifically, as a setting related to the communication method, T.P. Either 38 FAX transmission or general FAX transmission is stored. For example, regarding facsimile transmission to the counterpart device 50, T.W. When giving priority to the 38 FAX transmission, the user can use the T.38 as a communication method to give priority through the operation unit 14. Enter 38 FAX transmission. The CPU 30 sets T.264 as a setting relating to a communication method of facsimile transmission to be prioritized. The 38 FAX transmission is stored in the flash ROM 36. When giving priority to the general FAX transmission, the flash ROM 36 stores the general FAX transmission.

  The flash ROM 36 stores an encoding information table as shown in FIG. 2A in which a dial number is associated with an encoding method corresponding to the counterpart device 50 of the dial number. When the encoding method is not specified for the counterpart device 50 corresponding to the dial number, the encoding method is not associated with the dial number. The encoding information table may be in a form using a table (database) for other purposes in which the FAX number is managed in the FAX apparatus 10 and the dial number of the counterpart apparatus 50 is managed. For example, as shown in FIG. 2B, a form using a speed dial table for enabling input of a dial number by a speed dial key may be used. The speed dial table is a table in which a plurality of speed dial keys and dial numbers are associated with each other. In the case of the speed dial table, the encoding method is further associated with the dial number associated with the speed dial key. In addition, the above-described address book database may be used, or a communication management table in which facsimile transmission and / or reception is managed, or a so-called one-touch dial table for one-touch dialing may be used. These are similar in form to the abbreviated dial table.

  The flash ROM 36 stores settings related to the operation mode of the FAX apparatus 10. Specifically, either the first type mode or the second type mode is stored. Although details will be described later, in the FAX transmission process (see FIG. 3), the encoding method corresponding to the destination device 50 of the input dial number cannot be determined from the encoding information table (see FIG. 2A). (Refer to S106 in FIG. 3: No), the FAX apparatus 10 corresponds to the first type mode processing corresponding to the first type mode (S110 in FIG. 3, refer to FIG. 5 for details) or the second type mode. The second type mode process (S112 in FIG. 3, refer to FIG. 7 for details) is executed according to the setting relating to the operation mode. The first type mode is a code obtained by encoding image data corresponding to a read original with a low-compression encoding method (for example, MH) when the counterpart device 50 cannot determine the corresponding encoding method. Image data is generated, and this is transmitted to the T.D. via a communication band that can increase the communication speed. 38 FAX transmission mode. This mode functions, for example, as an operation mode set by a user who wants to give priority to the communication speed over the increase in billing amount by setting a high-speed communication band. In the second type mode, encoded image data obtained by encoding the image data corresponding to the read document once with a high compression rate encoding method (for example, MMR) is generated, and this is transmitted to the destination device. 50 is re-encoded into the encoded image data of the encoding method corresponding to T.50, and the communication bandwidth is the communication speed corresponding to the time required for the re-encoding. 38 FAX transmission mode. This mode functions as, for example, an operation mode set by a user who wants to prioritize charging over communication speed. The user operates the operation unit 14 and inputs in advance which operation mode the operation mode of the FAX apparatus 10 is set to. The CPU 30 stores the input first-type mode or second-type mode in the flash ROM 36 as settings related to the operation mode.

  The flash ROM 36 stores a corresponding time information table (see FIG. 2C) and a communication band table (see FIG. 2D) used in the communication band setting process (see FIG. 9). The corresponding time information table is a table in which the first time, specifically, the first time in a predetermined range, the first type second time, and the second type second time are associated and stored. The first time is one T.W. In 38 FAX transmission, it is the time required for encoding image data for all pages corresponding to all documents read by the reading unit 16 with MMR to generate encoded image data in the MMR format, which is highly compressed. This is the time (see S404 and S414 in FIG. 8) measured in the encoding process (see FIG. 8). The second time is the time (estimated time) required to decode the encoded image data in MMR format for all pages and re-encode the decoded image data into encoded image data in MR format or MH format. ). The case of re-encoding to MR format encoded image data is referred to as a first type of second time, and the case of re-encoding to MH format encoded image data is referred to as a second type of second time. The correspondence between the first time (the first time range) and the first type second time, and the correspondence between the first time (the first time range) and the second type second time is an experiment or calculation. Etc. The communication band table includes a communication band identifier (0, 1, and 2 in FIG. 2D) and a communication band (64 kbps, 512 kbps, 1000 kbps) in a bandwidth reservation type data communication service using the NGN network 3. This table defines the correspondence. As is clear from FIG. 4D, in the communication band table, the record in which the communication band identifier “0” and the communication band “1000” are associated is the head, and then the communication band identifier “1” and the communication band A record associated with “512” is registered, and finally a record associated with the communication band identifier “2” and the communication band “64” is registered. That is, the communication bandwidth is registered in descending order. The destination apparatus 50 is a FAX apparatus that is the same as the FAX apparatus 10 or that has been used conventionally. As shown in FIG. 1, the partner apparatus 50 includes units 52 to 76 corresponding to the units 12 to 36 of the FAX apparatus 10. A description of the counterpart device 50 is omitted.

<FAX transmission processing>
The FAX transmission process executed by the FAX apparatus 10 will be described with reference to FIGS. In the following, monochrome transmission by memory transmission is targeted. When starting the FAX transmission process, the user sets a document to be transmitted on the FAX apparatus 10 and inputs the dial number of the destination apparatus 50. As described above, the dial number is input using the numeric keypad or the abbreviated dial key in the operation unit 14 or from the address book database using the selection key. The FAX transmission process is started when the user inputs the dial number of the partner apparatus 50 and presses the start key. The CPU 30 acquires the dial number input by any one of the methods as described above (S100). Thereafter, the CPU 30 accesses the flash ROM 36, and the setting relating to the communication method of facsimile transmission to be prioritized is set to T.P. It is determined whether it is 38 FAX transmission (S104).

  The setting related to the communication method is T.264. In the case of 38 FAX transmission (S104: Yes), the CPU 30 encodes the dial number acquired in S100 (hereinafter referred to as “acquired dial number”) in the encoding information table (see FIG. 2A). It is determined whether the method is associated (S106). For example, when the encoded information table has a form as shown in FIG. 2B, the determination in S106 is performed using the speed dial table. S106 will be specifically described based on the encoding information table shown in FIG. For example, when the acquired dial number is “234-567-8901”, in FIG. 2A, the dial number that matches this is not associated with an encoding method. In such a case, CPU30 denies determination of S106 (S106: No), and transfers a process to S108. Even when the acquired dial number is not registered in the encoding information table, the CPU 30 denies the determination in S106 (S106: No), as in the case where the encoding method is not associated. When the acquired dial number is “123-456-7890”, in FIG. 2A, the encoding method “MR” is associated with the dial number matching this. In such a case, the CPU 30 affirms the determination in S106 (S106: Yes), and proceeds to S114. In S <b> 108, the CPU 30 accesses the flash ROM 36 and determines the operation mode of the FAX apparatus 10. When the FAX apparatus 10 is in the first type mode (S108: first type mode), the CPU 30 executes the first type mode process (S110). When the operation mode of the FAX apparatus 10 is the second type operation mode (S108: second type mode), the CPU 30 executes the second type mode process (S112). In S114, the CPU 30 executes a counterpart process. The first type mode process of S110, the second type mode process of S112, and the counterpart correspondence process of S114 will be described later.

  After executing S110, S112, or S114, the CPU 30 determines whether or not the connection flag set in the first type mode process, the second type mode process, or the counterpart correspondence process is a connection error (S115). The connection flag will be described later. When the connection flag indicates a connection error (S115: Yes), the CPU 30 shifts the process to S118 of FIG. When the connection flag is not a connection error (S115: No), the CPU 30 ends the FAX transmission process.

  The description returns to S104. The setting related to the communication method is general FAX transmission. When it is not 38 FAX transmission (S104: No), CPU30 transfers a process to S116 of FIG. 4, and produces | generates the encoded image data of a MMR format. Specifically, the CPU 30 controls the reading unit 16 to read a document set on the FAX apparatus 10, and image data corresponding to the document read by the reading unit 16 (for example, bitmap data; the same applies hereinafter). And stored in the RAM 34. Specifically, the image data is stored in a read buffer area secured on the RAM 34. Subsequently, the CPU 30 encodes the image data stored in the RAM 34 with MMR, and generates MMR-format encoded image data. The generated encoded image data in the MMR format is stored in the RAM 34, specifically, in a transmission memory area secured in the RAM 34. The CPU 30 performs S <b> 116 for all the originals set in the FAX apparatus 10. Accordingly, the RAM 34 (transmission memory area) stores encoded image data for all pages corresponding to all read originals. When the encoded image data for all the pages is stored, the preparation for memory transmission is completed. The CPU 30 executes a call according to the acquired dial number for general FAX transmission (S118). Specifically, the CPU 30 controls the PSTN I / F 22, closes the line to the PSTN 5, and executes a call according to the acquired dial number. As a result, a call signal is transmitted from the exchange 90 to the counterpart device 50 corresponding to the dialed number, and the counterpart device 50 also closes the line to the PSTN 5. Subsequently, the CPU 30 controls the PSTN I / F 22, communicates with the counterpart device 50 in accordance with the general FAX transmission communication standard, and receives DIS as a capability signal transmitted from the counterpart device 50. DIS is a command (signal) including reception capability information regarding decoding capability corresponding to an image data encoding method. According to the reception capability information included in the DIS, the encoding method of the encoded image data that can be received by the counterpart device 50 of the acquired dial number, in other words, the encoding scheme that the counterpart device 50 supports. Can be specified.

  After receiving the DIS, the CPU 30 determines the sameness between the encoding method specified by the reception capability information included in the DIS and the image data encoding method (MMR) in S116 (S120). Specifically, the CPU 30 determines whether the specified encoding method is MMR. When the identified encoding method is not MMR but MR or MH, the CPU 30 affirms the determination in S120 (S120: Yes), and shifts the processing to S122. In S122, the CPU 30 re-encodes the encoded image data in the MMR format stored in the RAM 34 into the encoded image data encoded by the specified encoding method (code-code conversion), and performs PSTN I / F22 is controlled, and the re-encoded encoded image data of a new format is transmitted to the counterpart device 50. For example, when the specified encoding method is MR, the CPU 30 decodes the encoded image data in the MMR format stored in the RAM 34, encodes the decoded image data in the MR, The encoded image data is transmitted to the counterpart device 50. When the identified encoding method is MMR, the CPU 30 denies the determination of S120 (S120: No), and moves the process to S124. In S <b> 124, the CPU 30 controls the PSTN I / F 22 to transmit the encoded image data in the MMR format stored in the RAM 34 to the counterpart apparatus 50. The CPU 30 does not perform re-encoding (code-code conversion) during transmission. Transmission by S122 and S124 is performed according to a procedure according to a communication standard for general FAX transmission. Since the communication standard for general FAX transmission is a communication standard that has been used conventionally, in the present embodiment, a description of the procedure according to this communication standard is omitted. After executing S122 or S124 in FIG. 4, the CPU 30 ends the FAX transmission process.

<First-class mode processing>
The first type mode process executed in S110 of FIG. 3 will be described with reference to FIG. The CPU 30 that has started the first type mode process controls the reading unit 16 to read a document set on the FAX apparatus 10, and encodes image data corresponding to the document read by the reading unit 16 with MH. Format encoded image data is generated (S200). The other points of S200 are the same as S116 of FIG. Subsequently, the CPU 30 controls the network I / F 20 and transmits INVITE in which the communication band is set to 1000 kbps (S202). INVITE is the same as that shown in FIG. Information on 38 FAX communication is included. In FIG. 6A, “m = application 9 TCP t38” This is a description for defining 38 FAX communication. “B = AS: 1000” is a description for setting the communication band to 1000 kbps. "A = T38FaxVersion: 1" This is a description for defining the version of 38 FAX communication. “A = T38FaxRateManagement: localTCP” is a description for defining that the protocol to be used is TCP. INVITE is a message described in accordance with SDP already put into practical use. Therefore, the other description regarding INVITE in FIG. After executing S202, the CPU 30 determines whether or not the SIP connection is successful (S204). When the connection by SIP fails (S204: No), the CPU 30 sets a connection error as a connection flag (S205). The connection flag is a flag indicating whether or not connection by SIP is possible, and the connection error indicates that the connection by SIP has failed. After executing S205, the CPU 30 ends the first type mode process. In this case, the CPU 30 affirms the determination of S115 of FIG. 3 to be subsequently executed (S115 of FIG. 3: Yes), shifts the processing to S118 of FIG. 4, and performs the processing after S118 as described above. Run. That is, in the FAX apparatus 10, T.A. If 38 FAX transmission cannot be performed, general FAX transmission via PSTN 5 is executed. When the connection by the SIP is successful (S204: Yes), the CPU 30 receives the DIS transmitted from the counterpart device 50 that has received the INVITE transmission in S202 (S206). DIS is as described above, and a description thereof will be omitted.

  S202 to S206 will be described more specifically. In S202, the CPU 30 reads the domain name “sipuri.com” of the SIP server 80 from the flash ROM 36, and generates a SIP URI from the read domain name and the acquired dial number. For example, assume that the acquired dial number is “234-567-8901”. In this case, the CPU 30 generates the SIP URI “2345678901@sipuri.com” from the domain name “sipuri.com” and the dial number “234-567-8901”. Subsequently, the CPU 30 sets the communication setting of the FAX apparatus 10 as the SIP communication setting. As a result, the FAX apparatus 10 can communicate with the counterpart apparatus 50 corresponding to the acquired dial number via the SIP server 80 in accordance with SIP. The CPU 30 controls the network I / F 20 and transmits INVITE using the generated SIP URI as a transmission destination. Thereafter, the CPU 30 waits until the 200 OK transmitted from the counterpart device 50 that has received the INVITE transmitted in S202 is received by the network I / F 20. 200 OK is a response code indicating that INVITE as a request has been understood and accepted. 200 OK includes a description according to SDP as shown in FIG. 6B, for example. As in the case of FIG. Contains information on 38 FAX communication. For example, “m = application 49152 TCP t38” This is a description for defining the acceptance of 38 FAX communication. “B = AS: 1000” is a description for setting the communication band to 1000 kbps. The 200 OK message is a response code written in accordance with the SDP already put into practical use. Therefore, other description regarding 200 OK in FIG. 6B is omitted.

  The determination in S204 is made according to whether or not 200OK is received. In other words, if 200 OK cannot be received, the CPU 30 determines that the connection by SIP has failed, denies the determination of S204 (S204: No), and shifts the processing to S118 of FIG. As a case where 200 OK cannot be received, for example, the counterpart device 50 is not connected to the NGN network 3. Although details are omitted, in this case, a signal (message) other than 200 OK is received. When 200 OK is received, the CPU 30 affirms the determination of S204, assuming that the connection by SIP is successful (S204: Yes). Subsequently, the CPU 30 transmits an ACK to the SIP server 80 using the generated SIP URI as a transmission destination. ACK is a message (method) for notifying that a response to the INVITE message has been received. The transmitted ACK is transmitted to the counterpart device 50 via the SIP server 80, and the counterpart device 50 receives this ACK. After transmitting ACK, the CPU 30 changes the communication setting of the FAX apparatus 10 to T.P. 38 communication settings. As a result, subsequent communication with the partner apparatus 50 does not go through the SIP server 80, but directly with the partner apparatus 50. 38. The CPU 30 controls the network I / F 20 and receives DIS transmitted from the counterpart device 50 in response to transmission of ACK (S206). When the DIS is received, the CPU 30 analyzes the DIS, acquires the reception function information included in the DIS, and stores it in the RAM 34, for example. After that, the CPU 30 38, and the MH-format encoded image data generated in S200 and stored in the RAM 34 is directly transmitted to the counterpart device 50 (S208). At this time, the CPU 30 does not re-encode the encoded image data in the MH format into encoded image data of another encoding method. In S208, the communication band (1000 kbps) negotiated by the above-described transmission / reception of INVITE and 200OK is used.

After transmitting the encoded image data in the MH format for all pages, the CPU 30 sets the communication setting to the SIP communication setting again. Thus, subsequent communication with the counterpart device 50 is performed via the SIP server 80 in accordance with SIP. Subsequently, the CPU 30 controls the network I / F 20 and disconnects the current communication with the counterpart device 50 (SIP server 80) by transmitting BYE (S210). BYE is a message (method) for notifying that a call by INVITE is to be terminated. The CPU 30 updates the encoding information table (see FIG. 2A) based on the acquired dial number and the reception capability information included in the DIS received in S206 and stored in the RAM 34 (S212). . For example, it is assumed that the acquired dial number is “234-567-8901” and the encoding method specified by the reception capability information is “MR”. In such a case, the CPU 30 newly adds “MR” in association with “234-567-8901” in the encoding information table. When the acquired dial number is not registered in the encoding information table, the CPU 30 associates the acquired dial number with the encoding method specified by the reception capability information and additionally registers it in the encoding information table. When the encoded information table has a form as shown in FIG. 2B, for example, S212 is executed for the abbreviated dial table. It is assumed that the encoding method has already been registered in association with the dial number. In this state, particularly when the reception capability information is different from the registered encoding method, the registered encoding method is overwritten with the encoding method newly stored in the RAM 34 this time. Next, CPU 30 sets the connection OK as a connection flag (S214). The connection OK is a connection flag indicating that the connection by the SIP is successful. After executing S214, the CPU 30 ends the first type mode process. CPU30 which complete | finished the 1st type mode process performs S115 of FIG.

<Type 2 mode processing>
The second type mode process executed in S112 of FIG. 3 will be described with reference to FIG. The CPU 30 that has started the second type mode process executes a high compression encoding process (S300), and executes a communication band setting process (S302). The high compression encoding process in S300 and the communication band setting process in S302 will be described later. After executing S302, the CPU 30 controls the network I / F 20 and transmits INVITE (S304). The INVITE transmitted in S304 is the same as the INVITE shown in FIG. However, in the INVITE transmitted in S304, the setting relating to the communication band is set to the value of the band (S) stored in a predetermined area such as the RAM 34 in S512 of the communication band setting process (FIG. 9) described later. For example, the setting “b = AS: 1000” in FIG. 6A is “b = AS: 512” when the bandwidth (S) is “512” kbps in S512 of FIG. , “64” kbps, “b = AS: 64”. If the bandwidth (S) is “1000” kbps in S512 of FIG. 9, it is the same as FIG. 6 (A). Regarding S304, the other points are the same as S202 in FIG. After executing S304, the CPU 30 determines whether or not the SIP connection is successful (S306). When the connection by SIP fails (S306: No), a connection error is set as a connection flag (S307). After executing S307, the CPU 30 ends the second type mode process. In this case, the CPU 30 affirms the determination of S115 of FIG. 3 to be subsequently executed (S115 of FIG. 3: Yes), shifts the processing to S118 of FIG. 4, and performs the processing after S118 as described above. Run. When the connection by SIP is successful (S306: Yes), after transmitting the INVITE in S202, the CPU 30 receives the DIS transmitted from the partner device 50 that has received the INVITE (S308). Since S306 and S308 are the same as S204 and S206 of FIG. 5 described above, description thereof will be omitted. In response to the transmission of INVITE in S304, 200OK transmitted from the partner apparatus 50 that has received this is set to “b = AS: 1000” in FIG. May change.

After executing S308, the CPU 30 executes T.E. 38, the network I / F 20 is controlled, and the encoded image data of a predetermined format is transmitted to the counterpart device 50 (S310). The encoded image data to be transmitted is in a format encoded by the encoding method specified by the reception capability information included in the DIS received in S308. In S310, CPU 30 determines whether or not counterpart device 50 can receive encoded image data in MMR format according to the reception capability information of counterpart device 50 stored in RAM 34. When it is determined that the counterpart device 50 cannot receive the encoded image data in the MMR format, in other words, the counterpart device 50 does not support the MMR, the CPU 30 determines whether the counterpart device 50 is in the MMR format stored in the RAM 34. The encoded image data is converted into encoded image data of the encoding method specified by the reception capability information included in the DIS received in S308. For example, it is assumed that the identified encoding method is MH. In this case, the CPU 30 decodes the encoded image data in the MMR format, encodes the decoded image data with the MH, generates the encoded image data in the MH format, and controls the network I / F 20 to Transmit to the destination device 50. When the partner apparatus 50 can receive the encoded image data in the MMR format, the CPU 30 controls the network I / F 20 without executing the process for re-encoding, and the MMR format stored in the RAM 34. The encoded image data is transmitted to the counterpart device 50. In S310, the communication band negotiated by transmission / reception of INVITE and 200OK is used. After transmitting the encoded image data for all pages in S310, the CPU 30 sets the communication setting to the SIP communication setting again, and disconnects the current communication with the counterpart device 50 (SIP server 80) (S312). . Subsequently, the CPU 30 updates the encoding information table (see FIG. 2A) based on the acquired dial number and the reception capability information included in the DIS received in S308 and stored in the RAM 34. (S314). S312 and S314 are processes corresponding to S210 and S212 of FIG. 5, respectively, and are executed in the same manner as described above. The description regarding this is omitted. Next, CPU 30 sets the connection OK as a connection flag (S316). After executing S316, the CPU 30 ends the second type mode process. CPU30 which complete | finished 2nd type mode process performs S115 of FIG.

<High compression encoding processing>
The high compression encoding process executed in S300 of FIG. 7 will be described with reference to FIG. The CPU 30 that has started the high-compression encoding process controls the reading unit 16 to read the original set on the FAX apparatus 10 (S400). The CPU 30 stores image data corresponding to the document read by the reading unit 16 in a reading buffer area secured on the RAM 34 (S402). The CPU 30 controls the time measuring unit 24 and starts measuring the passage of time by the time measuring unit 24 (S404). Subsequently, the CPU 30 initializes the value of the encoded image data capacity for counting the data capacity of the encoded image data to “0” (S406). Thereafter, the CPU 30 encodes the image data corresponding to one page of the document data stored in the reading buffer area on the RAM 34 with MMR, generates MMR-format encoded image data, and generates the MMR format. Is stored in the memory area for transmission on the RAM 34 (S408). The CPU 30 adds the data capacity of the encoded image data in the MMR format generated in S408 to the encoded image data capacity and updates it to a new value (S410). For example, it is assumed that the data capacity of the encoded image data newly generated in S408 is 10 kB. If S408 is executed for the first time after the high compression encoding process is started, the data capacity of the encoded image data is “0” (see S406). The data capacity is updated to “10”. It is assumed that the determination in S412 has already been denied (S412: No), and S408 and S410 have been executed, and as a result, the encoded image data capacity is “50”. In this case, 10 kB according to S408 of this time is added to “50”, and the encoded image data capacity is updated to “60”.

  After executing S410, the CPU 30 determines whether or not the encoding by S408 has been completed for the image data for all pages corresponding to the read original (S412). When image data is stored in the reading buffer area on the RAM 34 and encoding for all pages is not completed (S412: No), the CPU 30 returns the process to S408, and repeatedly executes S408 and S410. When the encoding for all the pages is completed (S412: Yes), the CPU 30 stops the measurement by the timer unit 24 (S414). Thereafter, the CPU 30 stores (saves) the time measured by the time measuring unit 24 in the predetermined area of the RAM 34 or the flash ROM 36 as the first time (S416). The first time is as described above, and is the time required for encoding image data for all pages with MMR to generate encoded image data in the MMR format. After executing S416, the CPU 30 ends the high compression encoding process. CPU30 which complete | finished the high compression encoding process performs a communication band setting process (refer S302 of FIG. 7). Note that S400, S402, S408, and S412 are processes corresponding to S116 in FIG. 4, S200 in FIG. 5, and S600 in FIG.

<Communication bandwidth setting process>
The communication band setting process executed in S302 of FIG. 7 will be described with reference to FIG. CPU30 which started the communication band setting process acquires 2nd time (S500). S500 will be specifically described. The CPU 30 specifies the first time stored in the RAM 34 or the like in S416 of FIG. Subsequently, the CPU 30 accesses the corresponding time information table shown in FIG. 2C, which is stored in the flash ROM 36, and relates to the specified first time, in detail, the specified first time. Either one of the second time of the first type or the second time of the second type associated with the range of the first time is acquired. When acquiring either the first type second time or the second type second time, the CPU 30 acquires a longer time. Subsequently, the CPU 30 acquires a reference communication speed (S502). The reference communication speed is acquired as follows. The CPU 30 specifies the data capacity of the encoded image data for all pages counted in S410 of FIG. 8 according to the encoded image data capacity. Subsequently, the CPU 30 calculates the reference communication speed by dividing the data volume of the encoded image data for all the specified pages by the second time acquired in S500.

  After executing S502, the CPU 30 initializes a variable I for the communication band identifier to “0” (S504). The variable I corresponds to the communication band identifier in the communication band table shown in FIG. The CPU 30 sets the communication band associated with the communication identifier that matches the value of the variable I to the band (S) (S506). If S506 is executed for the first time after the communication band setting process is started, since the variable I is “0”, the band (S) is set to “1000” kbps. If S510 has already been executed, the variable I has been counted up, so the corresponding communication band is set. For example, if S510 has already been executed twice and the variable I is “2”, the bandwidth (S) is set to “64”. Thereafter, the CPU 30 determines whether or not the reference communication speed acquired in S502 is equal to or higher than the band (S) set in S506 (S508). When the reference communication speed is smaller than the band (S) and not equal to or greater than the band (S) (S508: No), the CPU 30 increases the variable I by “1” (S510), returns the process to S506, and returns to S506 and S506. S508 is repeatedly executed. When the reference communication speed is equal to or higher than the band (S) (S508: Yes), the CPU 30 stores the band (S) at that time in a predetermined area of the RAM 34 or the flash ROM 36 as a communication band to be included in INVITE ( S512). After executing S512, the CPU 30 ends the communication band setting process. CPU30 which complete | finished the communication band setting process performs S304 of FIG. Regarding the determination in S508, “reference communication speed> bandwidth (S)” may be used.

<Countermeasure processing>
The counterpart correspondence processing executed in S114 of FIG. 3 will be described with reference to FIG. The CPU 30 that has started the partner correspondence process controls the reading unit 16 to read a document set on the FAX apparatus 10 (S600). In S600, the CPU 30 specifies the encoding method associated with the acquired dial number in the encoding information table (see FIG. 2A), and stores the image data corresponding to the document read by the reading unit 16 as follows. Encoding is performed using the specified encoding method, and encoded image data in the specified encoding format is generated. For example, when the acquired dial number is “123-456-7890”, in FIG. 2A, the encoding method “MR” is associated with the dial number matching this. Therefore, in S600, CPU 30 generates an encoded image data of the MR format. When the encoded information table has a form as shown in FIG. 2B, for example, S600 is executed for the abbreviated dial table (the same applies to S608, S616, and S618). The other points of S600 are the same as S116 of FIG. Subsequently, the CPU 30 sequentially executes S602 to S606. S602 to S606 are the same processes as S202 to S206 of FIG. 5 described above, and are executed in the same manner as described above. The description regarding this is omitted. Note that in S600, encoding by the encoding method registered in the encoding information table is executed as an encoding method that can be received by the counterpart device 50. Therefore, it is highly likely that counterpart device 50 can receive encoded image data according to this encoding method, and re-encoding is considered unnecessary. Therefore, the communication band set in INVITE transmitted in S602 is set to the highest speed band (1000 kbps). Also in the case where the determination in S604 is negative (S604: No), as in the case where the determination in S204 of FIG. 5 is negative (S204: No), in S605, the CPU 30 sets a connection error as a connection flag, The counterpart processing is terminated, the determination in S115 of FIG. 3 is affirmed (S115: Yes in FIG. 3), and the processes after S118 of FIG. 4 are executed as described above.

  After executing S606, the CPU 30 associates the encoding method included in the DIS received in S606 and specified by the reception capability information stored in the RAM 34 with the acquired dial number in the encoding information table. It is determined whether the compression rate is low based on the encoding method (S608). When the encoding method specified by the reception capability information is not a lower compression rate than the associated encoding method (S608: No), the CPU 30 shifts the processing to S610. In S610, the CPU 30 determines that 38, the network I / F 20 is controlled, and the encoded image data stored in the RAM 34 is directly transmitted to the counterpart apparatus 50 (S610). At this time, the CPU 30 does not execute re-encoding. In S610, the negotiated communication band (1000 kbps) is used by the above-described transmission and reception of INVITE and 200OK (the same applies to S612 described later). When the encoding method specified by the reception capability information has a lower compression rate than the associated encoding method (S608: Yes), the CPU 30 shifts the process to S612. In S612, the CPU 30 determines the T.P. 38, the network I / F 20 is controlled, and the encoded image data re-encoded to the encoded image data of the encoding method specified by the reception capability information is transmitted directly to the counterpart device 50. The re-encoding is performed by decoding the encoded image data stored in the RAM 34 and encoding the decoded image data by the encoding method specified by the reception capability information.

  After transmitting the encoded image data for all the pages in S610 or S612, the CPU 30 sets the communication setting to the SIP communication setting again, and disconnects the current communication with the counterpart device 50 (SIP server 80) ( S614). Since this point is the same as S210 in FIG. Subsequently, the CPU 30 determines whether or not the encoding method specified by the reception capability information is different from the encoding method associated with the acquired dial number in the encoding information table (S616). When the two encoding methods are different (S616: Yes), the CPU 30 encodes the encoded information based on the acquired dial number and the reception capability information included in the DIS received in S606 and stored in the RAM 34. The table is updated (S618). S618 is the same process as S212 in FIG. 5, and is executed in the same manner as described above. The description regarding this is omitted. When both encoding methods are the same (S616: No), or after executing S618, the CPU 30 sets connection OK as a connection flag (S620), and ends the counterpart processing. CPU30 which complete | finished the other party corresponding | compatible process performs S115 of FIG.

<Effects of this embodiment>
(1) In the above, encoded image data in the MH format is generated by the first type mode processing shown in FIG. 5 (see S200 in FIG. 5), and the communication band is set to 1000 kbps (S202 in FIG. 5). It was decided. Therefore, encoded image data in the MH format that can be received by the counterpart device 50 can be transmitted at a high speed of 1000 kbps. That is, while suppressing an increase in communication time due to re-encoding, T.W. The communication time for 38 FAX transmission can be shortened.

  (2) In the above, in the communication band processing shown in FIG. 9, the reference communication speed is obtained according to an encoding method that requires a longer time for re-encoding (see S500 and S502 in FIG. 9). Therefore, in S304 of the second type mode process shown in FIG. 7, an INVITE in which the bandwidth is set and the communication bandwidth is equal to or lower than the reference communication speed (less than) is transmitted. Therefore, even if the re-encoding is executed in S310, it is possible to prevent the occurrence of a situation in which the re-encoding is not in time and there is no encoded image data to be transmitted. T.A. The communication band set for 38 FAX transmission can be used effectively. In the state of waiting for re-encoding, even if a high-speed communication band is set, there is no encoded image data to be transmitted, and as a result, the communication time is the same as that of the low-speed communication band. If the communication band becomes high speed, it becomes possible to suppress the charge amount when the charge amount is high.

  (3) In the above description, the processing of S608 is adopted in the counterpart processing shown in FIG. The partner apparatus 50 corresponding to the acquired dial number may be exchanged for another FAX apparatus from the time when the association is made in the encoded information table. When the exchanged new FAX apparatus can receive the encoded image data of the encoding method having a high compression rate as compared with the FAX apparatus before the exchange, the new FAX apparatus is associated in the encoding information table. It is possible to receive encoded image data of the encoding method. That is, the FAX apparatus that supports MMR can also support MR and MH. A fax machine that supports MR can also handle MH. However, when the exchanged new FAX apparatus can receive only the encoded image data of the encoding method with the low compression rate as compared with the FAX apparatus before the exchange, the new FAX apparatus is associated in the encoding information table. It is impossible to receive the encoded image data of the encoding method made. In such a case, if the encoded image data generated in S600 is transmitted as it is, the counterpart device 50 cannot receive the encoded image data. Accordingly, in the counterpart processing, S608 is adopted, and whether the encoded image data to be transmitted to the counterpart device 50 corresponding to the acquired dial number is transmitted as it is (S610 in FIG. 10) or re-encoding. It is determined whether to transmit after conversion (see S612 in FIG. 10). For this reason, for example, even when the partner apparatus 50 is changed to a different FAX apparatus from the time when the encoding method is registered in the encoding information table, the receivable encoded image data is suitably transmitted. can do. The determination condition in S608 is “low compression rate”. When encoded image data with a high compression rate encoding method can be received, encoded image data with a low compression rate encoding method is It is based on being able to receive.

<Modification>
(1) In the above, in S116 of the FAX transmission process shown in FIG. 4, encoding is performed with MMR, and encoded image data in the MMR format is generated. In addition, the encoding method in S116 may be MR or MH. When the encoding method in S116 is MR or MH, S120 in FIG. 4 is determined based on MR or MH. When the encoding method in S116 is MR, in S122 of FIG. 4, the encoded image data in MR format is encoded in MMR or MH format according to the encoding method specified by the reception capability information included in DIS. The encoded image data is re-encoded and transmitted to the counterpart device 50 as described above. When the encoding method in S116 is MH, in S122 of FIG. 4, the encoded image data in the MH format is encoded in the MMR or MR format according to the encoding method specified by the reception capability information included in the DIS. The encoded image data is re-encoded and transmitted to the counterpart device 50 as described above.

  (2) In the above, the FAX apparatus 10 is configured to execute the first type mode process (see FIG. 5), the second type mode process (see FIG. 7 and the like), and the counterpart correspondence process (see FIG. 10). . In addition, at least one of these processes, for example, a FAX apparatus that executes the second type mode process without executing the first type mode process may be used. In this case, whether or not to execute the counterpart process is determined under various conditions. When the first type mode process is not executed, the setting relating to the above-described operation mode (first type mode, second type mode) is omitted.

3 Next generation network (NGN network), 5 Public switched telephone network (PSTN)
DESCRIPTION OF SYMBOLS 10 Facsimile device, 12 Display part, 14 Operation part, 16 Reading part 18 Printing part, 20 Network interface (network I / F)
22 PSTN interface (PSTN I / F), 24 clock section 26 bus line, 30 CPU, 32 program ROM, 34 RAM
36 Flash ROM
50 Facsimile device (destination device), 80 SIP server, 90 switch

Claims (3)

Encoded image data obtained by encoding one of a plurality of encoding methods having different compression rates for image data of a read original is transmitted to a partner apparatus connected to a bandwidth reservation type IP network. , A facsimile apparatus for facsimile transmission via the IP network,
A reading section for reading a document ;
Is connected before Symbol IP network, a communication unit you facsimile transmission,
An operation unit;
A storage unit;
CPU,
With
In the storage unit, one encoding method among the plurality of encoding methods and partner information corresponding to the partner device are stored in association with each other in advance.
The CPU
A reading process for reading the document using the reading unit;
A determination process for determining whether the destination information input by the operation unit is the destination information stored in the storage unit;
In the case where the destination information is not stored in the storage unit by the determination process, the image data of the document read by the reading process is a first type encoding method having the lowest compression rate among the plurality of encoding methods. Generating a first type of encoded image data encoded by the first storage unit, and storing the first type of encoded image data in the storage unit;
After the first encoded image data generation process, the communication unit is set to a communication band whose communication speed is the fastest among a plurality of communication bands in the IP network, and is stored in the first encoded image data generation process. A first facsimile transmission process in which the first type encoded image data is facsimile-transmitted to a counterpart device corresponding to the input counterpart information using the communication unit;
A facsimile machine that performs . The facsimile apparatus according to claim 1,
The CPU
Furthermore,
When the destination information is stored in the storage unit by the determination process, the image data of the document read in the reading process is associated with the destination information input by the operation unit stored in the storage unit. A second encoded image data generation process for generating encoded image data encoded by the encoded method and storing the encoded image data in the storage unit;
After the second encoded image data generation process, the first receiving function information including the encoding method of the counterpart device is received from the counterpart device corresponding to the input counterpart information via the communication unit. Reception function information reception processing,
When the encoding method included in the reception capability information has a higher compression rate than the encoding method of the counterpart information stored in the storage unit, the encoded image data corresponds to the input counterpart information. Facsimile transmission to the partner device using the communication unit,
When the encoding method of the reception capability information is lower in compression rate than the encoding method stored in the storage unit, after re-encoding the encoded image data with the encoding method of the reception capability information, A second facsimile transmission process for facsimile-transmitting the re-encoded encoded image data to the counterpart device corresponding to the input counterpart information using the communication unit;
A facsimile machine that performs . The facsimile apparatus according to claim 2,
The plurality of encoding methods are encoding methods in the case of monochrome transmission, and are MMR method, MR method, MH method in descending order of compression rate,
The CPU
Furthermore,
A mode setting process for setting either the first type mode setting or the second type mode setting different from the first type mode setting by the operation unit when performing facsimile transmission via the IP network; Run,
In the case where the first encoded image data generation process is not the partner information stored in the storage unit by the determination process and the first type mode setting is performed by the mode setting process, Executed,
In the storage unit,
The second type encoded image encoded by the second type encoding method, which is the MMR method having the highest compression rate among the plurality of encoding methods, from the image data corresponding to the original read by the reading process. A first time required to generate data; an estimated time required to decode the second type of encoded image data from the MMR method to the MR method; and the second type of encoded image data as the MMR method. Second time, which is an estimated time required for decoding from MH to MH, is stored for each width of the first time,
The CPU
Furthermore,
If the destination information is not stored in the storage unit by the determination process, and the second type mode is set by the mode setting process, the original of the document read by the reading process is set. A third encoded image data generation process for generating the second type encoded image data obtained by encoding the image data by the second type encoding method, and storing the second type encoded image data in the storage unit;
A data capacity acquisition process for acquiring the data capacity of the second type of encoded image data stored in the third encoded image data generation process;
A measurement process for measuring a time required for the third encoded image data generation process;
The data volume of the second type of encoded image data stored in the third encoded image data generation process is defined as a second time in which the time measured in the measurement process belongs to the width of the first time. A reference communication speed calculation process for calculating a reference communication speed by dividing the longer one of the two estimation times by the estimated time;
After the reference communication speed calculation process, a second reception capability that receives reception capability information including the encoding method of the counterpart device from the counterpart device corresponding to the input counterpart information via the communication unit. Information reception processing;
The communication unit is set to a communication band that is equal to or less than the reference communication speed calculated in the reference communication speed calculation process and is closest to the reference communication speed among a plurality of communication bands, and the reception function When the compression method of the force information has a lower compression rate than the second type of encoding method, the second type of encoded image data stored in the third encoded image data generation process is changed to the second type of encoded image data. After re-encoding with the encoding method of the reception capability information received in the reception capability information reception process, the re-encoded image data corresponding to the input destination information A third facsimile transmission process for facsimile transmission to the destination device using the communication unit;
A facsimile machine that performs .

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