JP2014207697A - Modulation/demodulation device, and communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a modulation/demodulation device, which allows configuration of a communication device to be simplified, and a communication device, whose configuration is simplified.SOLUTION: A facsimile modem 30 comprises: a digital data storage unit 32 for storing digital image data written in or acquired by a host control device 70 which controls communication of digital voice data via an IP network; a modulation/demodulation unit 42 for performing modulation or demodulation between digital image data and analog voice data; a codec unit 44 for performing coding or decoding between analog voice data and the digital voice data; and a digital voice data storage unit 34 for storing the digital voice data written in or acquired by the host control device 70.

Description

  The present invention relates to a modem device and a communication device.

  2. Description of the Related Art Conventionally, communication apparatuses such as facsimile apparatuses that perform facsimile communication via an IP (Internet Protocol) network are known.

  For example, in the technique disclosed in Patent Document 1, a digital image signal is modulated into an analog audio signal, the modulated analog audio signal is encoded into a digital audio signal, and the encoded digital audio signal is converted into an IP packet. Facsimile transmission is performed by transmitting to the IP network. Also, a facsimile is received by receiving an IP packet from the IP network, decoding a digital audio signal carried on the received IP packet into an analog audio signal, and demodulating the decoded analog audio signal into a digital image signal. Receive.

  By the way, in the prior art disclosed in Patent Document 1, it is necessary to separately provide a coding / decoding device for performing coding / decoding in addition to a modulation / demodulation device such as a facsimile modem for performing modulation / demodulation. There is a problem that becomes complicated.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a modem device that can simplify the configuration of a communication device, and a communication device that has a simplified configuration.

  In order to solve the above-described problems and achieve the object, a modulation / demodulation device according to one aspect of the present invention is generated by a modulation unit that modulates digital data input from an external device into analog audio data, and the modulation unit. An encoding unit that encodes the analog audio data into digital audio data output to an IP (Internet Protocol) network, and the analog audio data generated by the modulation unit is output to a public network It is characterized by.

  According to the present invention, there is an effect that the configuration of the communication device can be simplified.

FIG. 1 is a block diagram illustrating a configuration example of a facsimile apparatus according to the first embodiment. FIG. 2 is a block diagram illustrating a detailed configuration example of the facsimile modem and the host control device. FIG. 3 is a diagram illustrating an example of parameters stored in the parameter storage unit. FIG. 4 is an explanatory diagram of an example of a packet loss detection technique. FIG. 5 is an explanatory diagram of an example of a packet loss detection technique. FIG. 6 is a flowchart illustrating an example of a facsimile transmission process performed by the facsimile apparatus of the first embodiment. FIG. 7 is a flowchart illustrating an example of a VoIP facsimile reception process performed by the facsimile apparatus according to the first embodiment. FIG. 8 is a flowchart illustrating an example of a G3 facsimile reception process performed by the facsimile apparatus according to the first embodiment. FIG. 9 is a flowchart showing an example of public network control device detection processing performed by the facsimile modem of the first embodiment. FIG. 10 is a flowchart illustrating an example of packet loss detection processing performed in the facsimile apparatus according to the first embodiment. FIG. 11 is a block diagram illustrating a detailed configuration example of the facsimile modem according to the second embodiment. FIG. 12 is a flowchart illustrating an example of public network control device detection processing performed by the facsimile modem according to the second embodiment. FIG. 13 is a block diagram illustrating a detailed configuration example of the facsimile modem according to the third embodiment. FIG. 14 is a block diagram illustrating a configuration example of the facsimile apparatus 310 according to the fourth embodiment. FIG. 15 is a block diagram illustrating a detailed configuration example of the facsimile modem 330 according to the fourth embodiment.

  Embodiments of a modem and a communication device according to the present invention will be described below in detail with reference to the accompanying drawings. In the following embodiments, a facsimile modem and a facsimile apparatus will be described as examples of the modem and the communication apparatus, but the present invention is not limited to this. For example, the communication device may be any device that has a facsimile function such as a multifunction peripheral (MFP) that has at least one of a scanner function, a printing function, and a copy function in addition to a facsimile function. There may be.

(First embodiment)
First, the configuration of the facsimile apparatus according to the first embodiment will be described.

  FIG. 1 is a block diagram illustrating an example of the configuration of the facsimile machine 10 according to the first embodiment. As shown in FIG. 1, the facsimile apparatus 10 includes an IP network communication apparatus 12, a public network control apparatus 14, an operation apparatus 16, a reading apparatus 18, a printing apparatus 20, a storage apparatus 22, a facsimile modem 30, and the like. And a host control device 70.

  The IP network communication device 12 is connected to an IP network via a LAN (Local Area Network) or the like, and performs VoIP (Voice over Internet Protocol) facsimile communication with an external device via the IP network. It can be realized by an interface.

  The public network control device 14 is connected to a public network such as PSTN (Public Switched Telephone Networks), for example, and performs G3 facsimile communication with an external device via the public network. The public network control device 14 can be realized by, for example, silicon DAA such as a semiconductor or discrete DAA such as a transformer or a coil. In the present embodiment, an example in which the public network control device 14 is realized by silicon DAA will be described. In this embodiment, the public network control device 14 is unitized so as to be detachable from the facsimile device 10.

  The operation device 16 performs various inputs such as input of a telephone number of a facsimile transmission destination, and can be realized by, for example, a touch panel or a key switch.

  The reading device 18 reads a document and generates image data for facsimile transmission, and can be realized by, for example, a scanner.

  The printing apparatus 20 prints image data for facsimile reception on a recording medium such as transfer paper, and can be realized by, for example, a printer.

  The storage device 22 stores various programs executed by the facsimile apparatus 10, data used for various processes performed by the facsimile apparatus 10, and the like, for example, when performing facsimile transmission, VoIP facsimile transmission and G3 facsimile transmission. The transmission rule such as which one to use is stored. The storage device 22 is, for example, an HDD (Hard Disk Drive), an SSD (Solid State Drive), a memory card, an optical disk, a ROM (Read Only Memory), a RAM (Random Access Memory), or the like, magnetic, optical, or electrical. It can be realized by an existing storage device that can store the data.

  The facsimile modem 30 modulates digital image data into analog audio data and outputs the analog audio data to the public network control device 14, or further encodes the analog audio data into digital audio data. The facsimile modem 30 encodes digital audio data into analog audio data, and demodulates the encoded analog audio data and analog audio data input from the public network control device 14 into digital image data. Details of the facsimile modem 30 will be described later.

  The host control device 70 controls each part of the facsimile machine 10 and can be realized by a CPU (Central Processing Unit) or the like. The host control device 70 outputs digital image data generated by the reading device 18 and subjected to image processing by an image processing device (not shown) to the facsimile modem 30. The host control device 70 acquires digital voice data generated from digital image data by the facsimile modem 30 and controls the IP network communication device 12 to perform VoIP facsimile transmission of the digital voice data. The host control device 70 also controls the IP network communication device 12 to perform VoIP facsimile reception of digital voice data, and outputs the received digital voice data to the facsimile modem 30. The host control device 70 acquires digital image data generated from the digital audio data by the facsimile modem 30 and causes the printing device 20 to print the digital image data. Further, the host control device 70 sets, for the facsimile modem 30, whether to perform VoIP facsimile transmission or G3 facsimile transmission. Details of the host controller 70 will be described later.

  FIG. 2 is a block diagram illustrating an example of a detailed configuration of the facsimile modem 30 and the host controller 70. As shown in FIG. 2, the facsimile modem 30 includes a digital data storage unit 32, a digital voice data storage unit 34, a parameter storage unit 36, a public network controller input / output unit 38, and a DSP (Digital Signal Processor) 40. The host control device 70 includes a digital data control unit 72, a digital audio data control unit 74, and an IP network communication control unit 76.

  The digital data storage unit 32 stores digital image data (an example of digital data) and can be realized by a memory such as a RAM. The digital data storage unit 32 is used to perform handshake of digital image data between the host control device 70 and a DSP 40 described later.

  The digital audio data storage unit 34 stores digital audio data and can be realized by a memory such as a RAM. The digital audio data storage unit 34 is used for performing handshake of digital audio data between the host controller 70 and a DSP 40 described later.

  The parameter storage unit 36 includes parameters for VoIP facsimile communication (an example of parameters for digital communication via the IP network) and parameters for G3 facsimile communication (an example of parameters for analog communication via the public network). Are each stored, and can be realized by a memory such as a RAM.

  FIG. 3 is a diagram illustrating an example of parameters stored in the parameter storage unit 36. In the example illustrated in FIG. 3, the parameter storage unit 36 includes a transmission level (−15 dBm), an incoming call level (−36 dBm), a transmission equalizer (OFF), a reception equalizer (OFF), and an echo suppressor as parameters for VoIP facsimile communication. (ON) is stored. In VoIP facsimile communication, attenuation is small and the transmission level is low in order to suppress the influence of echo. The parameter storage unit 36 also includes a transmission level (−9 dBm), an incoming call level (−43 dBm), a transmission equalizer (ON), a reception equalizer (ON), an echo suppressor (OFF), and the like as parameters for G3 facsimile communication. I remember it.

  The DSP 40 controls the entire facsimile modem 30, and includes a modem unit 42, a codec unit 44, a public network control device detection unit 46, and a packet loss detection unit 48.

  The modem unit 42 modulates or demodulates digital image data and analog audio data (an example of first analog audio data). Specifically, in the case of VoIP facsimile communication, the modem unit 42 performs modulation or demodulation between digital image data and analog voice data with reference to parameters for VoIP facsimile communication, and in the case of G3 facsimile communication. Performs modulation or demodulation between digital image data and analog audio data with reference to parameters for G3 facsimile communication.

  Here, the public network control device input / output unit 38 will be described. The public network control device input / output unit 38 is an input / output interface for inputting / outputting analog voice data to / from the public network control device 14, and is realized by a serial interface in this embodiment. The public network control device input / output unit 38 includes a serial conversion circuit, a ringing detection circuit, a dial pulse generation circuit, and the like (all not shown). The public network control device input / output unit 38 is detachably connected to the public network control device 14.

  The codec unit 44 performs encoding or decoding between analog audio data and digital audio data (an example of first digital audio data).

  The public network control device detection unit 46 detects whether the public network control device input / output unit 38 and the public network control device 14 are connected. Specifically, the public network control device detection unit 46 determines whether or not the handshake between the public network control device input / output unit 38 and the public network control device 14 is valid, and the handshake is valid. In some cases, it detects that it is connected, and detects that it is not connected if the handshake is invalid. When the public network control device detection unit 46 detects that the public network control device input / output unit 38 and the public network control device 14 are not connected, the operation of the public network control device input / output unit 38 (various circuits) Stop).

  The packet loss detection unit 48 monitors the decoding from the digital audio data to the analog audio data by the codec unit 44, and detects the packet loss. Specifically, the packet loss detection unit 48 monitors a PCM (Pulse Code Modulation) waveform generated when the codec unit 44 decodes digital audio data into analog audio data, as shown in FIG. The waveform 80 from which the broken line 82 is missing is detected as a packet loss. Actually, when a packet loss occurs, a phase hit is generated in which the portion of the broken line 82 is lost and the phase is shifted. Therefore, the packet loss detection unit 48 has a waveform in which a phase hit 92 occurs as shown in FIG. 90 (abrupt level change) is detected as a packet loss. The packet loss detection unit 48 notifies the host control device 70 when a packet loss is detected. At this time, the packet loss detection unit 48 does not notify the packet loss but notifies it as a normal error, so that the host control device 70 can enter the normal retransmission sequence, and no complicated determination is required. Become.

  The digital data control unit 72 writes or acquires digital image data with the digital data storage unit 32.

  The digital audio data control unit 74 acquires or writes digital audio data with the digital audio data storage unit 34.

  The IP network communication control unit 76 controls VoIP facsimile communication.

  Next, the operation of the facsimile apparatus according to the first embodiment will be described.

  FIG. 6 is a flowchart illustrating an example of a flow of a procedure of facsimile transmission processing performed by the facsimile apparatus 10 according to the first embodiment. Note that it is assumed that the host control device 70 has previously set whether to perform VoIP facsimile transmission processing or G3 facsimile transmission processing.

  First, the reading device 18 reads a document and generates digital image data for transmission (step S100).

  Subsequently, the digital data control unit 72 of the host control device 70 converts the digital image data for transmission generated by the reading device 18 and subjected to image processing by an image processing device (not shown) into the digital data storage unit 32 of the facsimile modem 30. (Step S102).

  Subsequently, the modem unit 42 of the facsimile modem 30 modulates the transmission digital image data written in the digital data storage unit 32 into transmission analog audio data (step S104). In the case of VoIP facsimile transmission processing, the modem unit 42 outputs the modulated analog voice data for transmission to the codec unit 44 of the facsimile modem 30 (Yes in step S106).

  Subsequently, the codec unit 44 encodes the transmission analog audio data modulated by the modulation / demodulation unit 42 into the transmission digital audio data, and writes it into the digital audio data storage unit 34 of the facsimile modem 30 (step S108).

  Subsequently, the digital audio data control unit 74 of the host control device 70 acquires the digital audio data for transmission written in the digital audio data storage unit 34 (step S110).

  Subsequently, the IP network communication control unit 76 of the host control device 70 controls the IP network communication device 12 to perform VoIP facsimile transmission of the digital voice data for transmission acquired by the digital voice data control unit 74 (step S112). ).

  On the other hand, in step S106, in the case of G3 facsimile transmission processing, the modem unit 42 outputs the modulated analog voice data for transmission to the public network control device input / output unit 38 (No in step S106).

  Subsequently, the public network control device input / output unit 38 outputs the modulated transmission analog voice data to the public network control device 14, and the public network control device 14 is input from the public network control device input / output unit 38. G3 facsimile transmission of analog voice data for transmission is performed (step S114).

  FIG. 7 is a flowchart illustrating an example of a flow of a VoIP facsimile reception process performed by the facsimile apparatus 10 according to the first embodiment.

  First, the IP network communication control unit 76 controls the IP network communication device 12 to perform VoIP facsimile reception of digital voice data for reception (step S120).

  Subsequently, the digital audio data control unit 74 writes the reception digital audio data received by the IP network communication control unit 76 in the digital audio data storage unit 34 (step S122).

  Subsequently, the codec unit 44 decodes the reception digital audio data written in the digital audio data storage unit 34 into reception analog audio data (step S124).

  Subsequently, the modem unit 42 demodulates the reception analog audio data decoded by the codec unit 44 into reception digital image data, and writes it into the digital data storage unit 32 (step S126).

  Subsequently, the digital data control unit 72 acquires digital image data for reception written in the digital data storage unit 32 (step S128). Then, the printing apparatus 20 prints the reception digital image data acquired by the digital data control unit 72 on the transfer paper.

  FIG. 8 is a flowchart illustrating an example of a flow of a G3 facsimile reception process performed by the facsimile apparatus 10 according to the first embodiment.

  First, the public network controller 14 performs G3 facsimile reception of the received analog voice data, outputs the received analog voice data to the public network controller input / output unit 38, and the public network controller input / output unit 38 Then, the reception analog audio data input from the public network control device 14 is output to the modem unit 42 (step S130).

  Hereinafter, the process from step S132 to S134 is the same as the process from step S126 to S128 of the VoIP facsimile reception process shown in FIG.

  FIG. 9 is a flowchart showing an example of the flow of a public network control device detection process performed by the facsimile modem 30 of the first embodiment.

  First, the public network control device input / output unit 38 performs a handshake for communication with the public network control device 14 at the time of initialization (step S200).

  Subsequently, the public network control device detection unit 46 determines whether or not the handshake between the public network control device input / output unit 38 and the public network control device 14 is successful (step S202).

  Subsequently, when it is determined that the handshake has failed (No in step S202), the public network control device detection unit 46 does not detect the public network control device 14 (step S204), and the public network control device input / output The operation of the unit 38 is stopped (step S206).

  On the other hand, when it is determined that the handshake is successful (Yes in step S202), the public network control device detection unit 46 detects the public network control device 14 (step S208).

  Then, the public network control device detection unit 46 notifies the detection result of the public network control device 14 to the host control device 70 (step S210).

  FIG. 10 is a flowchart illustrating an example of a flow of a packet loss detection process performed by the facsimile apparatus 10 according to the first embodiment.

  First, the host control device 70 continues high-speed carrier reception until a carrier loss notification is made from the packet loss detection unit 48 of the facsimile modem 30 (No in steps S300 and S302).

  On the other hand, the codec unit 44 of the facsimile modem 30 converts the received digital audio data based on the high-speed carrier received by the host control device 70 to the received analog audio data until the packet loss is detected by the packet loss detection unit 48. Decryption is continued (No in steps S304 and S306).

  Then, the packet loss detection unit 48 monitors the decoding from the reception digital audio data to the reception analog audio data by the codec unit 44, and when the packet loss is detected (Yes in step S306), the host control A carrier disconnection notice is sent to the device 70 (step S308).

  When the packet loss notification is received from the packet loss detection unit 48 (Yes in Step S302), the host control device 70 performs recovery processing (V21 carrier wait and timer change) (Step S310).

  Subsequently, the host control device 70 and the facsimile modem 30 are each in a V21 carrier reception waiting state (No in step S312, No in step S314), and when a V21 carrier is received (Yes in step S312 and Yes in step S314), retransmission. Perform the flow.

  As described above, according to the first embodiment, since the facsimile modem 30 performs not only modulation / demodulation but also encoding / decoding, the facsimile apparatus 10 does not need to include an encoding / decoding apparatus that performs encoding / decoding. The structure can be simplified and the cost can be reduced.

  In the first embodiment, the facsimile modem 30 is connected to the public network control device input / output unit 38 which is an input / output interface with the public network control device 14 and the host control device 70. The digital audio data storage unit 34 is provided for handshaking. Therefore, according to the first embodiment, VoIP facsimile communication and G3 facsimile communication can be executed by one facsimile modem.

  In the first embodiment, since the public network control device 14 can be attached to and detached from the facsimile modem 30, the public network control device 14 is not necessary when only VoIP facsimile communication is performed. Further simplification and further cost reduction can be realized. Further, when the public network control device 14 is not connected to the facsimile modem 30, the operation of the public network control device input / output unit 38 can be stopped, so that useless power consumption can be suppressed.

  In the first embodiment, since the facsimile modem 30 detects a packet loss, the processing load on the host control device 70 can be reduced. In particular, in the first embodiment, when the facsimile modem 30 detects a packet loss, the host controller 70 notifies the host controller 70 of a carrier disconnection notification. Therefore, the host controller 70 enters the retransmission sequence without waiting for a carrier and overflowing the timer. The communication can be continued by receiving the retransmission. As a result, in the first embodiment, it is possible to reduce a communication error at the time of packet loss, that is, a situation in which a carrier overflows while waiting for a return of divergence and a timer overflows before reconvergence. In the first embodiment, since the facsimile modem 30 performs encoding / decoding, the packet loss can be detected in the facsimile modem 30 and there is no need to separately provide a packet loss detection device. Can be further simplified.

(Second Embodiment)
In the second embodiment, an example in which the public network control apparatus is realized by a discrete DAA will be described. In the following, differences from the first embodiment will be mainly described, and components having the same functions as those in the first embodiment will be given the same names and symbols as those in the first embodiment, and description thereof will be given. Is omitted.

  FIG. 11 is a block diagram illustrating an example of a detailed configuration of the facsimile modem 130 of the facsimile apparatus 110 according to the second embodiment. In the second embodiment, the public network control device 114, the public network control device input / output unit 138, and the public network control device detection unit 146 of the DSP 140 are different from the first embodiment. Below, these each part is demonstrated.

  The public network control device 114 is realized by a discrete DAA in the present embodiment.

  In this embodiment, the public network control device input / output unit 138 is realized by a parallel interface. The public network control device input / output unit 138 includes a parallel conversion circuit, a ringing detection circuit, a dial pulse generation circuit, and the like (all not shown).

  The public network control device detection unit 146 monitors on-hook and off-hook from the public network control device 114 to the public network control device input / output unit 138. When the on-hook is detected, the public network control device detection unit 146 detects that the public network control device input / output unit 138 and the public network control device 114 are connected. When the off-hook is detected, Detects that the public network control device input / output unit 138 and the public network control device 114 are not connected. The public network control device input / output unit 138 is set to a logic level so as to be off-hook when not connected to the public network control device 114.

  FIG. 12 is a flowchart illustrating an example of a flow of a public network control device detection process performed by the facsimile modem 130 according to the second embodiment.

  First, the public network control device detection unit 146 monitors on-hook and off-hook from the public network control device 114 to the public network control device input / output unit 138 when the line is opened at the initial time. The public network control device detection unit 146 proceeds to step S402 when detecting an off-hook (No in step S400), and proceeds to step S406 when detecting an on-hook (Yes in step S400).

  Hereinafter, the processing from step S402 to S408 is the same as the processing from step S204 to S210 of the public network control device detection processing shown in FIG.

  As described above, according to the second embodiment, since the presence / absence of the public network control device 114 can be detected using existing signals such as on-hook and off-hook, a signal for detecting the presence / absence of the public network control device, etc. Need not be prepared separately, and control can be simplified.

(Third embodiment)
In the third embodiment, an example in which a plurality of modulation / demodulation units are provided will be described. In the following, differences from the first embodiment will be mainly described, and components having the same functions as those in the first embodiment will be given the same names and symbols as those in the first embodiment, and description thereof will be given. Is omitted.

  FIG. 13 is a block diagram illustrating an example of a detailed configuration of the facsimile modem 230 of the facsimile apparatus 210 according to the third embodiment. In the third embodiment, the first modem 242 and the second modem 243 of the DSP 240 are different from the first embodiment. Below, these each part is demonstrated.

  The first modem 242 performs modulation or demodulation between digital image data and analog audio data (an example of first analog audio data) in the case of VoIP facsimile communication. That is, the first modulation / demodulation unit 242 refers to the parameters for VoIP facsimile communication, modulates the digital image data into analog audio data and outputs the analog audio data to the codec unit 44, or the analog audio data input from the codec unit 44. Demodulate digital image data.

  The second modulation / demodulation unit 243 performs modulation or demodulation between digital image data and analog audio data (an example of second analog audio data) in the case of G3 facsimile communication. That is, the second modulation / demodulation unit 243 refers to the parameters for G3 facsimile communication, modulates the digital image data into analog voice data and outputs the analog audio data to the public network control device input / output unit 38, or the public network control device input / output. The analog audio data input from the unit 38 is demodulated into digital image data.

  The operation of the facsimile apparatus 210 of the third embodiment is that the modulation / demodulation operation subject in the case of VoIP facsimile communication is the first modulation / demodulation unit 242, and the modulation / demodulation operation subject in the case of G3 facsimile communication is the second modulation / demodulation unit 243. Except for a certain point, the operation is the same as that of the facsimile machine 10 of the first embodiment, and thus the description thereof is omitted.

  As described above, according to the third embodiment, the facsimile modem 230 includes the first modem 242 for VoIP facsimile communication and the second modem 243 for G3 facsimile communication. VoIP facsimile communication and G3 facsimile communication can be executed simultaneously.

(Fourth embodiment)
In the fourth embodiment, an example in which a codec device is externally attached to a facsimile modem will be described. In the following, differences from the third embodiment will be mainly described, and components having the same functions as those of the third embodiment will be denoted by the same names and symbols as those of the third embodiment, and description thereof will be given. Is omitted.

  FIG. 14 is a block diagram illustrating an example of the configuration of the facsimile apparatus 310 according to the fourth embodiment, and FIG. 15 is a block diagram illustrating an example of the detailed configuration of the facsimile modem 330 according to the fourth embodiment. In the fourth embodiment, the point that the facsimile apparatus 310 includes the codec device 360, the point that the facsimile modem 330 includes the codec device input / output unit 350, the processing contents of the public network control device input / output unit 338, and the second modem unit of the DSP 340 The processing content of 343 is different from that of the third embodiment. Below, these each part is demonstrated.

  The codec device 360 performs encoding or decoding between analog audio data and digital audio data (an example of second digital audio data).

  The codec device input / output unit 350 generates a clock for the codec device 360, inputs or outputs digital audio data to / from the codec device 360, and outputs digital audio data to / from the digital audio data storage unit 34. An input / output interface for input or output.

  The second modem 343 performs not only modulation or demodulation between digital image data and analog voice data in the case of G3 facsimile communication, but also modulation or demodulation between digital image data and analog voice data in the case of VoIP facsimile communication.

  The public network control device input / output unit 338 exclusively performs analog audio data input / output with the public network control device 14 and analog audio data input / output with the codec device 360.

  Note that the operation of the facsimile apparatus 210 of the fourth embodiment is that the second modulation / demodulation unit 343 is the second modulation / demodulation unit 343 when the second modulation / demodulation unit 343 performs VoIP facsimile communication, and the coding / decoding operation unit is the codec device. Except for the point 360, the operation is the same as the operation of the facsimile apparatus 210 of the third embodiment, and thus the description thereof is omitted.

  As described above, according to the fourth embodiment, the second modulation / demodulation unit 343 can perform not only modulation / demodulation for G3 facsimile communication but also modulation / demodulation for VoIP facsimile communication. Therefore, one facsimile modem can perform VoIP facsimile communication. Can be executed simultaneously.

(Modification)
In addition, this invention is not limited to said each embodiment, A various deformation | transformation is possible. For example, the second embodiment may be combined with the third embodiment or the fourth embodiment.

10, 110, 210, 310 Facsimile device 12 IP network communication device 14, 114 Public network control device 16 Operation device 18 Reading device 20 Printing device 22 Storage device 30, 130, 230, 330 Facsimile modem 32 Digital data storage unit 34 Digital voice Data storage unit 36 Parameter storage unit 38, 138, 338 Public network control device input / output unit 40, 140, 240, 340 DSP
42 Modulator / Demodulator 44 Codec Unit 46, 146 Public Network Controller Detection Unit 48 Packet Loss Detector 70 Host Controller 72 Digital Data Controller 74 Digital Voice Data Controller 76 IP Network Communication Controller 242 First Modulator / Decoder 243 343 2 modulation / demodulation unit 350 codec device input / output unit 360 codec device

Japanese Patent No. 4059113

Claims (19)

A modulator that modulates digital data input from an external device into analog audio data;
An encoding unit that encodes the analog audio data generated by the modulation unit into digital audio data output to an IP (Internet Protocol) network;
The modulation / demodulation apparatus characterized in that the analog audio data generated by the modulation unit is output to a public network.   The modulation unit performs modulation based on a first parameter when the digital audio data is output to the IP (Internet Protocol) network, and when the analog audio data is output to the public network, the first The modulation / demodulation apparatus according to claim 1, wherein modulation is performed based on a second parameter different from the parameter. A decoding unit for decoding digital audio data input from the IP (Internet Protocol) network into analog audio data;
A demodulator that demodulates the analog audio data generated by the decoder or the analog audio data input from the public network into digital data output to the external device;
The modem according to claim 1 or 2, further comprising:   The demodulator performs demodulation based on a third parameter when the digital voice data is input from the IP (Internet Protocol) network, and when the analog voice data is input from the public network, The modem according to claim 3, wherein demodulation is performed based on a fourth parameter different from the parameter.   Input / output of the digital voice data to and from the IP (Internet Protocol) network is controlled by a control device that controls communication of the digital voice data through the IP (Internet Protocol) network. The modem according to any one of claims 1 to 4. A decoding unit that decodes digital audio data input from an IP (Internet Protocol) network into analog audio data;
A demodulator that demodulates the analog audio data generated by the decoding unit or the analog audio data input from the public network into digital data output to an external device;
A modulation / demodulation device comprising:   The demodulator performs demodulation based on a first parameter when the digital voice data is input from the IP (Internet Protocol) network, and when the analog voice data is input from the public network, The modem according to claim 6, wherein demodulation is performed based on a second parameter different from the parameter. A modulation unit that modulates digital data input from the external device into analog audio data;
An encoding unit that encodes the analog audio data generated by the modulation unit into digital audio data; and
The analog voice data generated by the modulation unit is output to the public network, and the digital voice data generated by the encoding unit is output to the IP (Internet Protocol) network. The modem according to 6 or 7.   The modulation unit performs modulation based on a third parameter when the digital voice data is output to the IP (Internet Protocol) network, and when the analog voice data is output to the public network, the third unit The modulation / demodulation apparatus according to claim 8, wherein modulation is performed based on a fourth parameter different from the parameter.   Input / output of the digital voice data to and from the IP (Internet Protocol) network is controlled by a control device that controls communication of the digital voice data through the IP (Internet Protocol) network. The modem according to any one of claims 6 to 9. A packet loss detector that monitors the decoding of the digital audio data into the analog audio data and detects packet loss;
The modulation / demodulation apparatus according to claim 6, further comprising:   The modem according to claim 11, wherein the packet loss detection unit notifies the control device when the packet loss is detected. Public network control for inputting analog voice data from a public network control device that controls communication of the analog voice data via the public network, and outputting analog voice data modulated by the modulation unit to the public network control device A device input / output unit;
The modulation / demodulation apparatus according to claim 1, further comprising:   The modem according to claim 13, wherein the public network control device input / output unit is detachably connected to the public network control device. When the presence / absence of connection between the public network control device input / output unit and the public network control device is detected, and it is detected that the public network control device input / output unit is not connected to the public network control device, A public network control device detection unit for stopping the operation of the network control device input / output unit;
The modem according to claim 13 or 14, further comprising: The public network control device is silicon DAA,
The public network controller detection unit detects that the handshake with the silicon DAA is connected when the handshake with the silicon DAA is valid, and detects the silicon with the handshake with the silicon DAA is invalid. 16. The modem according to claim 15, wherein it detects that the DAA is not connected. The public network control device is a discrete DAA;
The public network control device detection unit detects that it is connected to the discrete DAA when it receives an on-hook from the discrete DAA, and is not connected to the discrete DAA when it receives an off-hook from the discrete DAA 16. The modem according to claim 15, wherein the modem is detected. A communication device comprising a modem and a control device,
The modem is
A modulator that modulates digital data input from an external device into analog audio data;
An encoding unit that encodes the analog audio data generated by the modulation unit into digital audio data, and
The analog voice data generated by the modulation unit is output to a public network, the digital voice data generated by the encoding unit is output to an IP (Internet Protocol) network,
The controller is
A digital data control unit that inputs or outputs the digital data to or from the modem;
A digital audio data control unit that inputs or outputs the digital audio data to or from the modem;
A communication control unit for controlling communication of the digital audio data via the IP (Internet Protocol) network;
A communication apparatus comprising: A communication device comprising a modem and a control device,
The modem is
A decoding unit that decodes digital audio data input from an IP (Internet Protocol) network into analog audio data;
A demodulator that demodulates the analog audio data generated by the decoding unit or the analog audio data input from the public network into digital data output to an external device,
The controller is
A digital data control unit that inputs or outputs the digital data to or from the modem;
A digital audio data control unit that inputs or outputs the digital audio data to or from the modem;
A communication control unit for controlling communication of the digital audio data via the IP (Internet Protocol) network;
A communication apparatus comprising:

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