JP2927999B2 - Facsimile signal transmission equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile signal transmitting apparatus for multiplexing and transmitting a facsimile signal.

[0002]

2. Description of the Related Art FIG. 17 is a block diagram showing a conventional facsimile signal transmission apparatus for multiplexing and transmitting a facsimile signal. In the figure, 51 is an input terminal on the trunk side, 52 is an output terminal on the trunk side, 53 is a facsimile modem (hereinafter, referred to as a modem) for modulating and demodulating a facsimile signal, 54 is a multiplexer, and 55 is a high-speed line. An output terminal on the bearer side, which is a signal output terminal, and 56 is an input terminal on the bearer side. Note that FIG.
1 shows a case where N output terminals 52 and N modems 53 are provided. On the trunk side, there is an exchange accommodating, for example, a voice terminal, a data terminal, a facsimile terminal and the like. Here, the exchange side is called a trunk side, and the high-speed line side is called a bearer side.

Next, the operation will be described. Modem 53
Is the International Telegraph and Telephone Consultative Committee (CCITT) Recommendation V2
1, and has a modulation / demodulation function based on V27ter and V29. A facsimile signal, which is an analog signal input to any of the input terminals 51 on the trunk side, is 9.6 kbp by a modem 53 corresponding to the input terminal 51.
It is restored to a digital signal such as s.

The digital signal is supplied to a multiplexer 54. The multiplexer 54 multiplexes the digital signal with other signals and outputs the multiplexed signal to an output terminal 55.
Output from When a signal is received from the high-speed line, the multiplexer 54 extracts a digitized facsimile signal from the multiplexed signal input from the input terminal 56 and passes the digital signal to any one of the modems 53. The modem 53 modulates the digital signal and outputs a facsimile signal as a modulated wave from the corresponding output terminal 52. In this case, the transmission and reception of the facsimile signal is performed in real time. Further, within the range of the multiplexing capability of the multiplexer 54, N modems 5
Three parallel operations are possible.

In such a system, the input terminal 51
Are limited to facsimile signals. Therefore, it is necessary to control the audio signal and the like so as not to be supplied to the input terminal 51 in a stage preceding the input terminal 51 on the trunk side.

FIG. 18 shows an example of processing for a facsimile signal for multiplexing. In the figure,
53a is a demodulation unit, 53b is a modulation unit, 64 is a demodulation unit 53a
Is an oversampling circuit that performs oversampling only on the control signal of 300 bps in the digital signal output by, and 65 denotes a stuff control circuit that performs stuff control on the data output from the oversampling circuit 64.

Reference numeral 66 denotes a transmission gate for controlling the passage of stuff-controlled data. Reference numeral 67 denotes a transmission-side multiplex transmission path through which data passing through the transmission gate 66 is transmitted. Reference numeral 68 denotes a receiving-side multiplex transmission line through which data subjected to stuff processing by the opposite device is transmitted, and reference numeral 69 denotes a receiving gate that controls the passage of the data.

Reference numeral 70 denotes a destuff control circuit for performing destuff control on the data passing through the reception gate 69. Reference numeral 71 denotes a speed of a control signal of 300 bps which is oversampled in the destuff controlled data. This is a speed converter that performs conversion and outputs data after speed conversion to the modulation unit 53b of the modem 53.

Next, the operation will be described. The analog facsimile signal input from the transmission line is converted into a facsimile signal digitized by the demodulation unit 53a of the modem 53 and input to the oversampling circuit 64.

If the facsimile signal, that is, the demodulated data output from the demodulation unit 53a is a control signal of 300 bps, the oversampling circuit 64 converts the demodulated data synchronized with the demodulated clock extracted by the demodulation unit 53a into 9 bits. .6 kbps. Thereafter, the stuff control circuit 65 sets the transmission-side multiplex transmission path 67
Stuff data is provided to absorb the difference from the transmission clock of the data, and stuff control information is added.

If the demodulated data output from the demodulation unit 53a is high-speed data such as 9.6 kbps or 7.2 kbps, only stuff control is performed without performing oversampling processing. The data subjected to the stuff control in this manner is added with the information of the stuff control, for example, 10 fps for one facsimile signal.
The signal is equivalent to kbps.

The data on the multiplex transmission line 68 on the receiving side passes through a receiving gate 69 and is input to a destuff control circuit 70. The destuff control circuit 70 first determines whether the stuff data is regular data or dummy data based on the stuff control information included in the input data.

If the data output from the destuff control circuit 70 is a control signal, the speed converter 7
1 converts the speed of a signal corresponding to 9.6 kbps into a signal of 300 bps. The data de-stuffed in this manner is input to the modulation section 53b in synchronization with a modulation clock provided from the modulation section 53b of the modem 53, modulated into an analog facsimile signal, and output to the transmission path.

FIG. 19 is a block diagram showing another conventional facsimile signal transmission apparatus for multiplexing and transmitting a facsimile signal. In the figure, reference numeral 57 denotes a reception control unit for performing a reception operation in opposition to a facsimile terminal (specifically, via a switchboard or the like) existing on the trunk side;
Is a transmission control unit for performing a transmission operation facing a facsimile terminal existing on the trunk side, 59 is a reception data storage for storing image data received by the reception control unit 57, and 60 is an image to be transmitted by the transmission control unit 58. It is a transmission data storage for storing data. FIG. 19 shows N reception control units 57.
And a case where N transmission control units 58 are provided.

Next, the operation will be described. The arbitrary reception control unit 57 communicates with the facsimile terminal performing the transmission operation via the corresponding input terminal 51 and output terminal 52 on the trunk side. Then, the received image data is stored in the received data storage 59.

When there is an empty channel on the high-speed line side, the multiplexing device 54 sends out the image data in the received data storage 59 from the bearer side output terminal 55 as a part of the multiplexed signal. On the other hand, the multiplexed signal input from the high-speed line is input to the multiplexer 54 from the input terminal 56 on the bearer side. The multiplexing device 54 extracts the image data from the multiplexed signal and stores the image data in the transmission data storage 60.
To be stored.

One of the transmission controllers 58 calls a facsimile terminal as a receiver and communicates with the facsimile terminal. That is, the transmission control unit 58 functions as a facsimile transmitter, and transmits the image data in the transmission data storage 60 to the facsimile terminal. In addition,
If the transfer destination facsimile terminal is already in use, the transmission control unit 58 performs a retransmission operation after a predetermined time has elapsed. FIG. 19 shows a case where N transmission control units 58 are provided. However, if the transmission data storage unit 60 has a large capacity, the number of transmission control units 58 may be one. However,
In this case, the average time during which the image data stays in the transmission data storage unit 60 becomes longer, and the immediacy of facsimile communication is lost.

[0018]

Since the conventional facsimile signal transmission apparatus is configured as described above, the signal input to the trunk-side input terminal 51 must be a facsimile signal. That is, it is necessary to supply only a facsimile signal to the input terminal 51, and a facility for that purpose must be provided in the preceding stage. A general-purpose device installed on the public line side of an exchange accommodating voice terminals and various data terminals is generally used. There was a problem of lack of sex.

In the system shown in FIG. 18, when the number of facsimile signals to be handled simultaneously increases, the stuff / destuff control of the oversampling circuit 64, the stuff control circuit 65, the destuff control circuit 70, etc. Not only does the circuit scale for control increase,
Since the control signal of bps is over-sampled and converted into a signal equivalent to 9.6 kbps, there is a problem that transmission efficiency is wastefully increased.

The present invention has been made to solve the above problems, and has as its object to provide a facsimile signal transmission apparatus which can be directly connected to a public line side of an exchange. It is another object of the present invention to provide a facsimile signal transmission apparatus capable of performing stuff / destuff control at a transmission rate corresponding to the transmission rate of a facsimile signal and reducing the hardware scale for that.

[0021]

According to a first aspect of the present invention, there is provided a facsimile signal transmission apparatus for transmitting a signal input from a plurality of transmission paths in which a voice signal, a facsimile signal and various data signals are mixed, to a multiplexer. A transmission route switching device for switching whether or not to output to a signal path; demodulating a facsimile signal in a signal on any one of the transmission paths to output a control signal and image data; When it recognizes that a plurality of modems that modulate data and output a modulated wave and that one of the modems has demodulated and output a facsimile signal, the modem recovers.
While giving an instruction to the transmission route switcher to prevent the input signal of the transmission line being tuned from passing through the audio signal path,
1 to a control signal and image data a plurality of modems has output output to a facsimile signal path to the multiplexer by multiplexing, and 1 to control signals and image data of the input signals from the facsimile signal path A multiplexing controller that outputs to a plurality of modems and outputs a reception switching instruction when one of the modems outputs a modulated wave; and one of a voice signal path and a modem output. A switch for outputting to a plurality of transmission paths a reception route switch for outputting a modulated wave output by a modem to a predetermined transmission path in response to a reception switching instruction of a multiplexing controller. .

According to a second aspect of the present invention, there is provided a facsimile signal transmitting apparatus according to the first aspect of the present invention, wherein a signal on a plurality of transmission paths is introduced to each facsimile signal transmission apparatus. The multiplexing controller recognizes that the facsimile discriminator has detected the facsimile signal, and gives an instruction to supply the signal input from the transmission line to the modem to the transmission route switch. It is like that.

The facsimile signal transmitting device according to the third aspect of the present invention, the relative facsimile signal transmitting device according to the first aspect of the invention, provided in parallel with the modem
A telephone modem that demodulates a predetermined signal among signals input from the same transmission line as the modem, modulates data output by the multiplexing controller, and outputs a modulated wave to the transmission line, and a signal on a plurality of transmission lines. Introduce each transmission line
A facsimile modem identifier for detecting a facsimile signal and a signal to be handled by the telephone modem is provided every time.The multiplexing controller recognizes that the facsimile modem identifier has detected the facsimile signal or the signal to be handled by the telephone modem. An instruction to supply a signal input from the transmission line to the modem and the telephone modem is provided to the transmission route switch.

According to a fourth aspect of the present invention, there is provided a facsimile signal transmission apparatus comprising: a tone detector for detecting an answer tone of a facsimile apparatus from signals input from a plurality of transmission paths in which voice signals, facsimile signals and various data signals are mixed. outputs a control signal and image data by performing demodulation for facsimile signals in the signal of one of the transmission path, and a plurality of modems for outputting a modulated wave performs modulation for control signals and image data, a plurality of transmission A transmission route switcher for switching whether or not to output a signal input from a channel to a voice route to a multiplexer, and for switching whether to output a signal input from a plurality of transmission channels to a modem, and a tone detector. Recognizing that the answer tone has been detected, the signal input from the transmission line
An instruction to supply to any of the modems is given to the transmission route switcher, and it is recognized that the modem has restored the digital command signal, and in a no-signal section between the digital command signal and the subsequent training signal, The inspection
An instruction is given to the transmission route switching device to prevent the signal input from the transmission path related to the output from passing through the audio signal path, and 1 to
Multiplexing for multiplexing control signals and image data output by a plurality of modems and outputting the multiplexed control signals and image data to a facsimile signal path leading to a multiplexer, and outputting the control signal and image data among the signals input from the facsimile signal path to the modem. And an activation controller.

According to a fifth aspect of the present invention, in the facsimile signal transmission apparatus according to the fourth aspect of the present invention, the multiplexing controller and the facsimile modem restore the non-standard function setting signal. Is recognized, the monitoring of the facsimile signal by the modem is stopped.

A facsimile signal transmitting apparatus according to a sixth aspect of the present invention is the facsimile signal transmitting apparatus according to the fourth aspect, wherein the multiplexing controller controls the multiplexing controller for a predetermined time after the tone detector detects the answer tone. If the modem does not restore the digital command signal, the monitoring of the facsimile signal by the modem is stopped.

A facsimile signal transmitting apparatus according to a seventh aspect of the present invention determines the amount of information transmitted per unit time according to the transmission rate of the facsimile signal, and converts the facsimile signal into a facsimile signal and a multiplex transmission path. It is provided with a processor for forming a transmission format to which stuff data and stuff control information for absorbing a difference between transmission times are added, and a multiplex processing unit for multiplexing a facsimile signal in the transmission format.

In the facsimile signal transmission apparatus according to the present invention, a processor for adding a processor when the facsimile signal is a control signal of 300 bps. Data and stuff control information are also provided with redundancy.

[0029]

According to the first aspect of the present invention, the multiplexing controller comprises:
When it is determined the signal of any transmission line is a facsimile signal, the signal of the transmission path so as not falling into the pathway for the audio signal, it gives a switching instruction to the transmission route switching unit.

The transmission route switching device in a second aspect of the present invention, in accordance with an instruction of the multiplexing controller only when the facsimile signal appears on the transmission line, assigns a modem signal of the transmission path is supplied .

The transmission route switching device in the invention of claim 3, wherein, in response to an instruction of the multiplexing controller only when the signal to be handled by the facsimile signal or a telephone modem to transmission path is appeared, the transmission path Ensure that the signal is provided to the modem and the telephone modem.

A multiplexing controller according to a fourth aspect of the present invention assigns a modem to which a signal on the transmission line is supplied when an answer tone appears on the transmission line, and further comprises a digital command signal and a training signal in the facsimile control signal. In the non-signal section between the signals, the signal supply to the audio signal path is stopped.

The multiplexing controller according to the fifth aspect of the present invention, when the modem recognizes the non-standard function setting signal in the facsimile control signal, supplies the signal only to the voice signal path.

The multiplexing controller according to the sixth aspect of the present invention starts timer monitoring when an answer tone appears on the transmission line. When the modem does not recognize the digital command signal within a predetermined time, the multiplexing controller responds. It is determined that the tone is not from the facsimile terminal, and the supply of the signal from the transmission line to the modem is stopped.

The processor according to the present invention edits the image data and the control signal in the facsimile signal into a predetermined transmission format.

The processor according to the eighth aspect of the present invention further creates a transmission format including information constituting a control signal of 300 bps in an overlapping manner.

[0037]

[Embodiment 1] FIG. 1 shows a facsimile signal transmission apparatus according to an embodiment of the present invention, in which voice insertion (DSI; Digita) is performed.
l DCME (Digital Circuit Multiple Equipment) which is a multiplexing device with Speech Interpolation function
t) It is a system configuration diagram shown with an apparatus.

In the figure, reference numeral 1 denotes a trunk input which is a transmission line for transmitting a voice signal, a facsimile signal, etc., and reference numeral 2 denotes a trunk output. The trunk input 1 and the trunk output 2 are connected to an exchange accommodating, for example, a voice terminal or a facsimile terminal. Reference numeral 5 denotes a bearer-side voice output route for transferring a voice signal, 6 denotes a bearer-side voice input route, 7 denotes a bearer-side facsimile output route for transmitting a facsimile signal, and 8 denotes a bearer-side facsimile input route. The bearer-side voice output route 5 and the bearer-side voice input route 6 constitute a voice signal route (hereinafter referred to as a voice route), and the bearer-side facsimile output route 7 and the bearer-side facsimile input route 8 constitute a facsimile signal route ( Hereinafter, this will be referred to as a facsimile route).

Reference numeral 20 denotes a facsimile signal transmission device,
22 is a DCME device, and 24 and 25 are high-speed digital lines. 23 is a DME having the same configuration as the DCME device 22.
A CME device, 21 is a facsimile signal transmission device having the same configuration as the facsimile signal transmission device 20, 28 is a trunk output, and 29 is a trunk input.

Here, the functions of the DCME devices 22 and 23 will be described. Regarding DCME devices, CCITT Recommendation Q. 50, and these DCME devices 22 and 23 are also described in Recommendation Q.50. 50. FIG. 2 shows a system in which only DCME devices are provided. In FIG. 2, trunk inputs 31 and 36 are input to DCME devices 22 and 23, respectively.
Trunk outputs 32 and 35 are output from the CME devices 22 and 23. The trunk input 31 and the trunk output 32 and the trunk input 36 and the trunk output 35 are respectively connected to an exchange or the like.

The DCME device 22 receives a signal from the trunk side in a signal format 38 as shown in the lower part of FIG. Then, it detects whether or not the voice channel is voiced, and if voiced, searches for a free channel on the bearer side. If there is a vacant channel, an audio signal is set in that channel, and a signal is transmitted to the bearer in a signal format 37 as shown in the upper part of FIG. When the voice channel on the trunk side becomes unvoiced, the signal of the corresponding channel on the bearer side is stopped.
Then, the connection state of each channel is set to an assignment channel (AC).

When the signal of the signal format 37 is input from the bearer side, the DCME device 23 on the other side reconfigures the signal and outputs it to the trunk output 35. In this way, the voiced signal input to the DCME device 22
It is output from the ME device 23 to the corresponding voice channel on the trunk side.

As described above, since only voiced signals are transmitted on the bearer side, the number of channels can be reduced. The number of channels is reduced to ４ to ５ by the ADPCM function for reducing the number of transmission bits together with the DSI function.

By the way, Recommendation Q. 50 has 64 kbp
An s clear channel and a transmission path setting request signal for data in the voice band are defined. Since the transmission rate of the signal on the voice channel on the bearer side is reduced by adopting ADPCM, terminal data of 64 kbps cannot be transmitted on that channel. However, if a 64 kbps channel prepared on the bearer side is used, such data transmission is also possible. That is, when such data is generated, an on-demand request of 64 kbps is issued to the DCME device 22 to set a clear channel of 64 kbps.

The on-demand request for the 64 kbps clear channel is output from an exchange or the like in the configuration shown in FIG. That is, the exchange or the like uses the time slot (TS) # 16 in the signal format 38 on the trunk side.
64 kbps on-demand request signal (SIG)
Is sent. Then, an empty channel is searched, and for example, FIG.
CH # 1 and CH # 2 in the signal format 38 shown in FIG.
A clear channel of 64 kbps as shown by is set as an empty channel.

As described above, the 64 kbps clear channel is allocated when an on-demand request occurs, and is allocated to a random position in the signal format 38. Then, the facsimile signal transmission apparatuses 20 and 21 shown in FIG. A facsimile signal is to be transmitted by using 50 64 kbps clear channel setting functions.

FIG. 4 is a block diagram showing the internal configuration of the facsimile signal transmission apparatus according to the first embodiment of the present invention. In the figure, 3 is a modem for modulating and demodulating a facsimile signal, 4A is a multiplexing controller for controlling multiplexing of a facsimile control signal and image data, and 9A outputs a signal on the trunk side to an output terminal 5 of a voice route. A transmission route switching device 10 for switching between output to the modem 3 and a reception route switching device 10 for switching a signal source of a signal supplied to the trunk side.

The transmission route switch 9A outputs the signal on the trunk side to the output terminal 5 of the voice route, outputs the signal to the modem 3, or both of them, according to the command of the multiplexing controller 4A. Output or switch. The reception route switch 10 switches between outputting the output of the modem 3 to the trunk side and outputting the signal input to the input terminal 6 of the voice route to the trunk side. FIG. 4 shows a case where N signal paths and N modems 3 are provided.

Next, the operation of the one shown in FIG. 4 will be described. First, the signal input to the input terminal 1 on the trunk side is supplied to the output terminal 5 of the voice route and the modem 3 by the transmission route switch 9A. Until the modem 3 detects the facsimile signal, the signal on the trunk side is given to the DCME device 22 through the output terminal 5 of the voice route. As described above, the DCME device 22 transfers a sound signal using an empty channel.

Assuming that the signal on the trunk side is constituted by a signal format 40 shown in the lower part of FIG. 5 and a facsimile signal is set in TS # 1, the modem 3 demodulates and outputs a facsimile control signal from the facsimile signal. Will be. The demodulation result is output to the multiplexing controller 4A.
Will be notified.

When the multiplexing controller 4A recognizes that the modem 3 has demodulated and output the control signal, the multiplexing controller 4A transmits the transmission route switch 9
A is given a switching instruction. The transmission route switch 9A prevents the signal on the trunk side from being output to the output terminal 5 of the voice route in response to the switching instruction. As a result, the output from the output terminal 5 is silent.

Further, the multiplexing controller 4A controls the TS in the facsimile route signal format 39 shown in the middle part of FIG.
Using # 16, the setting of the 64 kbps clear channel is requested to the DCME device 22. Further, the multiplexing controller 4
A, as shown in the middle part of FIG.
Set to 1 and transfer to DCME device 22. Here, CH # 1 in the signal format 39 is 64 kbps, and the facsimile image data is 9.6 kbps.
, It can be divided into six sub-channels. That is, the outputs of the plurality of modems 3 can be set to CH # 1. If the transmission rate is lower than 9.6 kbps, more subchannels can be set.

When receiving the on-demand request for the 64 kbps clear channel, the DCME device 22 searches for an empty channel on the bearer side and sets CH # 1, which is a 64 kbps clear channel, to the empty channel as shown in the upper part of FIG. . The facsimile control signal and image data
The data is transmitted to the partner DCME device 23 using H # 1. The DCME device 23 transfers the contents of CH # 1 to the facsimile signal transmission device 21.

Further, the multiplexing controller 4A exchanges information with the multiplexing controller of the facsimile signal transmission apparatus 21 of the other party by using a FAX assignment channel (AC).
Set F). In the ACF, a transmission rate of image data, an array of multiplexed data, a capture state and a use state of a 64 kbps clear channel, and the like are set.

This ACF is transferred to the DCME device 22. Furthermore, the DCME device 22 puts it on the ACF in the signal format 37 on the bearer side and transmits it to the DCME device 23 on the partner side. Then, the ACF is transferred to the multiplexing controller 4A of the facsimile signal transmission device 21. The multiplexing controller 4A on the other side issues a switching instruction to the reception route switching device 10 based on the contents of the ACF. Further, the content of the received CH # 1 is passed to the modem 3. The modem 3 modulates the signal provided from the multiplexing controller 4A and converts the modulated wave into a T
The signal is output to the reception route switch 10 on S1. Since the receiving route switch 10 outputs the output of the modem to the trunk side in accordance with the switching instruction of the multiplexing controller 4A, it supplies the output of the modem 3 to the trunk side.

When the multiplexing controller 4A recognizes the end of the facsimile communication based on the content of the control signal demodulated and output by the modem 3, the ACF notifies the multiplexing controller 4A of the end to the ACF. Further, a switching instruction is given to the transmission route switch 9A, and the output on the trunk side is output to the output terminal 5 of the voice route. Further, the multiplexing controller 4A on the other side gives a switching instruction to the reception route switching device 10,
It is assumed that the signal input to the input terminal 6 of the voice route is output to the trunk side.

The DCME device 22 is connected to the C on the bearer side.
Release H # 1. As a result, the channel that was CH # 1 becomes an empty channel. When a facsimile signal is being transmitted by CH # 1 and another facsimile communication is started, a new 64 kbps clear channel is set. Channels not used as 64 kbps clear channels are used for voice transmission using the DSI function. Therefore, each channel on the bearer side is used efficiently for voice signals and facsimile signals, and the transmission efficiency of the system shown in FIG.
The efficiency of the system is improved by only the DCME devices 22 and 23 shown in FIG.

In the above embodiment, the case where all facsimile signals pass through the facsimile route has been described. When a procedure other than the control procedure by 30 is executed, the facsimile signal may be passed through the voice route. That is, Recommendation T. When facsimile communication can be performed by a non-standard procedure other than the standard procedure by the FAX 30, there is a possibility that a facsimile signal that cannot be handled by the modem 3 may be inputted. Guarantee that facsimile communication can be performed.

For example, when the modem 3 restores the non-standard function setting signal (NSS), the multiplexing controller 4A gives a switching instruction to the transmission route switch 9A so that no signal is supplied to the modem 3. In this case, although the transmission efficiency is reduced as compared with the case of using the facsimile route, there is an effect that various non-standard facsimile procedures can be coped with and the range of application can be expanded.

Embodiment 2 FIG. FIG. 6 is a block diagram showing the internal configuration of the facsimile signal transmission device according to the second embodiment of the present invention. In this case, the FAX discriminator 11 detects facsimile signals in all the lines on the trunk side.
Is provided. The facsimile signal detected by the facsimile identifier 11 includes a CCITT recommendation There is a called station identification signal (CED: 2100 Hz tone) by 30 and a digital command signal (DCS).

Next, the operation will be described. The FAX identifier 11 constantly monitors all the lines on the trunk side, and when a facsimile signal appears on a certain line, notifies the multiplexing controller 4B of the fact. Upon receiving the notification, the multiplexing controller 4B searches for a vacant modem 3 and instructs the transmission route switch 9B to connect to the modem 3 a line on which a facsimile signal on the trunk side has appeared. The line is still connected to the output terminal 5 of the audio route.

The modem 3 demodulates the supplied signal. After the modem 3 demodulates and outputs the facsimile control signal, the facsimile signal transmission apparatus performs the same operation as the facsimile signal transmission apparatus according to the first embodiment.

In the above embodiment, the FAX discriminator 11
Of the transmission route switching unit 9B by the output of the FAX discriminator and the switching of the transmission route switching unit 9B by the demodulation output of the modem 3 and the two-stage switching. 9B can supply the trunk side signal to the modem 3 and inhibit the output to the voice route at once. However, FAX
The discriminator 11 detects the 2100 Hz tone, and there are also terminals accommodated in exchanges other than the facsimile apparatus.
When transmitting a 00 Hz tone, for example, it is necessary to perform two-stage switching.

Further, in the case of the first embodiment, the initial state is a state in which the signal on the trunk side is supplied to both the voice route and the modem 3, but in the case of the second embodiment, In the initial state, the signal on the trunk side is supplied only to the voice route.

As described above, if the FAX discriminator 11 is provided and the modem 3 is allocated when a facsimile signal appears on the trunk side line, the number of modems 3 is made smaller than the number of trunk side lines. be able to.
That is, the required number of modems is determined by the number of channels on the bearer side and the facsimile occupancy on the trunk side, and the number M is generally smaller than the number N of lines on the trunk side.

Embodiment 3 FIG. FIG. 7 is a block diagram showing an internal configuration of a facsimile signal transmission device according to a third embodiment of the present invention. In the figure, reference numeral 12 denotes a telephone modem connected in parallel to the modem 3.

Next, the operation will be described. The modem 3 and the telephone modem 12 always input signals on the trunk side. When the modem 3 demodulates and outputs the facsimile signal, the multiplexing controller 4C operates in the same manner as in the first embodiment.

On the other hand, when the telephone modem 12 demodulates and outputs a predetermined signal, the multiplexing controller 4C operates in the same manner as the multiplexing controller 4A in the first embodiment. The data is transmitted to the other party. However, the multiplexing controller 4C notifies the other side that the demodulated data of the telephone modem 12 is transmitted by the ACF. Then, the multiplexing controller 4C on the other side supplies the transmitted data to the telephone modem 12 instead of the modem 3 according to the contents of the ACF.

Embodiment 4 FIG. FIG. 8 is a block diagram showing an internal configuration of a facsimile signal transmission apparatus according to a fourth embodiment of the present invention. In the figure, reference numeral 13 denotes a FAX modem discriminator which realizes the function of the FAX discriminator 11 and identifies a signal handled by the telephone modem 12. Here, the number of telephone modems 12 may be smaller than the number of lines on the trunk side.
Further, the number does not necessarily have to match the number of modems 3.

In this case, the FAX modem identifier 13
Detects a predetermined signal from the signal on the trunk side,
This is notified to the multiplexing controller 4D. Multiplexing controller 4
When D receives the notification, the vacant telephone modem 12
In order to connect the line on which the predetermined signal on the trunk side has appeared to the telephone modem 12.
To instruct. The line remains connected to the output terminal of the audio route. Thereafter, the telephone modem 12 performs demodulation processing on the supplied signal, and
2 demodulates and outputs a predetermined signal, the multiplexing controller 4D
Gives a switching instruction to the transmission route switch 9B so as not to output the signal on the trunk side to the voice route.

Although the case where the modem 3 and the telephone modem 12 are separate parts has been described with reference to FIGS. 7 and 8, they may be integrated.

Embodiment 5 FIG. FIG. 9 is a block diagram showing a transmitting side of a facsimile signal transmitting apparatus according to a fifth embodiment of the present invention. In the figure, reference numeral 14 denotes a tone detector for detecting a 2100 Hz tone, and 4E denotes a multiplexing controller which issues a switching instruction when the modem 3 restores the DCS.

Next, the operation will be described with reference to the flowchart of FIG. The tone detector 14 constantly monitors all the lines on the trunk side, and when a 2100 Hz tone appears on a certain line, notifies the multiplexing controller 4E of the fact (step ST1). Upon receiving the notification, the multiplexing controller 4E searches for a vacant modem 3 and checks for a modem 2 on the trunk side.
The transmission route switch 9B is instructed to connect the line on which the 100 Hz tone appears to the modem 3. The line is still connected to the output terminal 5 of the audio route.

At this time, the multiplexing controller 4E uses the ACF to transmit the multiplexing controller 4E of the other party through the DCME device.
To the user that a 2100 Hz tone has been detected. On the other side, the multiplexing controller 4E receives the ACF and selects a free modem 3 according to the contents.

On the side where the 2100 Hz tone is detected, when the modem 3 demodulates and outputs the DCS of the control signal of the facsimile signal, the multiplexing controller 4E switches the transmission route switch 9
A switching instruction is issued to B to prohibit the output of the voice route of the signal on the trunk side. Then, the subsequent facsimile signal is passed through the facsimile route (step ST2,
ST3). CCITT Recommendation T. According to No. 30, since a non-signal section of 75 ms is defined between the DCS and the subsequent modem training (LTS) of the training check signal (TCF), switching of the transmission route switch 9B is performed in that section. Will be

By switching in that section,
The signal before the DCS passes through the voice route, and the signal after the TCF passes through the facsimile route, so that switching is not performed in the middle of a certain signal. That is,
It is possible to prevent an instantaneous interruption of the signal on the partner side at the switching timing, which may occur when a certain signal passes through the voice route and the subsequent portion passes through the facsimile route.

FIG. 10 illustrates the situation. Among the control signals of the facsimile signal, the digital identification signal (DIS) and the DCS pass through both the voice route and the facsimile route, and the signals after the TCF are the facsimile signals. It turns out that only the route is passed. Where PA is C
CITT Recommendation T. 30 shows a preamble. When the modem 3 demodulates and outputs the DCS, the other party also switches from the voice route to the facsimile route.

Further, D at the end of the separated voice route
An idle signal is supplied to the DCME device so that the CME device does not assign a channel to the signal of the voice route overlapping with the channel carrying the signal passing through the facsimile route.

Embodiment 6 FIG. In the fifth embodiment, when DCS is detected, the signal is not passed through the audio route.
In some cases, the facsimile terminal sends NSS without sending DCS. In such a case, since facsimile communication is performed in a non-standard procedure, a signal that the modem 3 cannot handle during facsimile communication may occur, or a non-signal section between the NSS and the TCF may not be guaranteed.

Therefore, as shown in the flow chart of FIG. 12, when the modem 3 demodulates and outputs the NSS, the multiplexing controller 4E stops detection of facsimile signals thereafter (steps ST11 and ST12). ). At this time, a switching instruction is given to the transmission route switch 9B so that the supply of the signal on the trunk side to the modem 3 is stopped. In this way, a facsimile signal according to the non-standard procedure passes through the voice route, and a signal that can guarantee facsimile communication according to the non-standard procedure can be obtained.

Embodiment 7 FIG. In each of the above embodiments, 2100H
When the z-tone signal is detected, the multiplexing controller 4E confirms that the modem 3 demodulates and outputs DCS or NSS. For example, a data terminal is accommodated in an exchange, and the terminal transmits a 2100 Hz tone. When used, the multiplexing controller 4E also starts checking the DCS or NSS. If no DCS or NSS is detected, the modem 3 will continue to be used.

Therefore, when the multiplexing controller 4E is notified of the detection of the 2100 Hz tone as shown in the flowchart of FIG. 13, the modem 3 may be assigned and the timer may be started (step ST21).
If the DCS cannot detect the NSS within a predetermined time, the detection of the facsimile signal thereafter is stopped (steps ST22 and ST12). In this way, when another data terminal handles the 2100 Hz tone, it is possible to prevent the monitoring using the modem 3 from being continued by the 2100 Hz tone by that terminal.

Embodiment 8 FIG. FIG. 14 is a block diagram showing a facsimile signal transmission apparatus according to an eighth embodiment of the present invention. In the figure, 53a is a demodulation unit, 53b is a modulation unit,
Reference numeral 53 denotes a facsimile modem, and reference numerals 67 and 68 denote multiplex transmission lines on the transmission side and the reception side, which are the same as or equivalent to those in the related art denoted by the same reference numerals in FIG.

Reference numeral 72 denotes a stuff buffer for temporarily holding stuff control on the transmission facsimile demodulated data demodulated by the demodulation unit 53a, and reference numeral 73 denotes a plurality of stuff-controlled transmission facsimile demodulators. This is a multiplex processing unit that multiplexes data and sends the multiplexed data to the multiplex transmission line 67 on the transmission side.

Reference numeral 74 denotes a demultiplexing unit which distributes the multiplexed received facsimile demodulated data received from the multiplex transmission line 68 on the receiving side, and 75 performs destuffing control on the distributed received facsimile demodulated data. To do
This is a destuff buffer that temporarily holds it.

Reference numeral 76 denotes software control of stuff control or destuff control for transmission facsimile demodulated data temporarily stored in the stuff buffer 72 or received facsimile demodulated data temporarily stored in the destuff buffer 75. The processor to be implemented.

Next, the operation will be described. A transmission analog facsimile signal input via a transmission line such as a public line is demodulated into transmission facsimile demodulated data by a demodulation unit 53a of a facsimile modem 53, and the demodulated transmission facsimile demodulated data is sent to a stuff buffer 72. Will be retained.

Here, the transmission facsimile demodulated data includes a control signal of 300 bps, a 2.4 kbps
4.8 kbps, 7.2 kbps and 9.6 kbps
There is high speed data. In accordance with these transmission rates, the processor 76 uses the reference transmission data transmitted within a predetermined unit time to absorb the difference between the transmission facsimile demodulated data and the transmission speed of the transmission path as shown in FIG.
The stuff data 81 and the stuff control information 82 are added one bit at a time to form a transmission format.

The transmission facsimile demodulated data held in the stuff buffer 72 is bit-operated to insert regular data or dummy data into the stuff data 81 in accordance with the amount of data held per unit time. Is applied. Information indicating whether the stuff data 81 is regular data or dummy data is the stuff control information 8
Set to 2.

Here, as for the control signal of 300 bps, as shown in FIG. 2, each of the stuff data 81 and the stuff control signal 82 is transmitted to the same data three bits at a time to provide redundancy, thereby providing error protection. It is carried out.

The transmission facsimile demodulated data formatted into the transmission format shown in FIG. 15 is multiplexed by the multiplexing unit 73 for each unit time, and
Sent to

On the other hand, the multiplexed received facsimile demodulated data transmitted through the multiplex transmission line 68 on the receiving side is:
The data is received and distributed by the separation processing unit 74, sent to the corresponding destuff buffer 75, and temporarily stored. The processor 76 controls the stuff control information 82 included in the received facsimile demodulated data held in the destuff buffer 75.
, Dummy data is removed in accordance with the contents of the above.

For the control signal of 300 bps, the received stuff control information 82 and stuff data 81 of 3 bits each are individually subjected to majority decision, and similar destuff control is executed based on the decision result.

The received facsimile demodulated data de-stuffed in this manner is modulated according to the transmission path input to the modulation section 53b of the allocated facsimile modem 53, and is converted into a received analog facsimile signal. The data is transmitted to the transmission path.

Embodiment 9 FIG. In the above embodiment, 300
The transmission of stuff data and stuff control information that is tripled within the same unit time for error protection of the bps control signal has been shown, but as shown in FIG.
Make control frame (unit time) have multiple frames,
The stuff data 81a, 81b, 81c and the stuff control information 82a, 82b, 82c for three times may be transmitted together and retransmitted three times, which also provides error protection for the 300 bps control signal. Can be

In this case, since the same information is retransmitted by using another unit time, more effective error protection can be performed for a burst error occurring on the transmission path.

[0097]

As described above, according to the first aspect of the present invention, a facsimile signal transmitting apparatus is provided in which signals on a plurality of transmission paths are introduced into a plurality of modems, and any one of the modems restores the facsimile signal. The multiplexing controller instructs the transmission route switch not to supply the signal on the transmission path related to the restoration to the voice signal path, and outputs the subsequent signal to the facsimile signal path. Since a signal input from the signal path is passed to one or more modems and a switching instruction is given to the reception route switch so as to output the outputs of the modems to the transmission path, the switching equipment is used. This has the effect of providing a device that can be directly connected to and can improve transmission efficiency.

According to the second aspect of the invention, when the facsimile discriminator detects the facsimile signal from the signal on the transmission path, the multiplexing controller connects the modem with the line on which the facsimile signal appears. Since the connection is configured, there is an effect that the device can be configured with a smaller number of modems than the number of lines constituting the transmission path.

According to the third aspect of the present invention, a facsimile signal transmitting apparatus, a facsimile modem discriminator and a telephone modem are provided, and when the facsimile modem discriminator detects a signal which can be handled by the telephone modem from a signal on the transmission line, Since the multiplexing controller is configured to connect the line on which the signal appears to the modem, the signal that can be handled by the telephone modem can be improved in transmission efficiency as compared with the case where the signal is passed through the voice signal path. Has the effect.

According to the fourth aspect of the present invention, when the tone detector detects that an answer tone has appeared on the transmission line, the multiplexing controller connects the facsimile signal transmission apparatus to the modem. And the modem is D
After the CS is restored, in the no-signal section between the DCS and the TCF, a switching instruction is given to the transmission route switch so as to prevent the supply of the signal of the transmission path to the voice signal path, and the subsequent signals are transmitted by facsimile. Since the signal path is configured to pass through, when the signal path is switched from the audio signal path to the facsimile signal path, an effect is obtained that does not affect the other party on the switching.

According to the fifth aspect of the present invention, the facsimile signal transmission apparatus is configured such that when the modem restores the NSS as a result of the demodulation, the multiplexing controller stops monitoring the facsimile signal by the modem. Passing the facsimile signal according to the non-standard procedure through the voice signal path has an effect that a facsimile communication according to the non-standard procedure can be guaranteed.

According to the sixth aspect of the present invention, the facsimile signal transmission apparatus is provided for controlling the multiplexing when the facsimile signal cannot be restored until a predetermined time has elapsed since the modem started demodulating the facsimile signal. Is configured to stop the monitoring of the facsimile signal by the modem, so that even if a terminal other than the facsimile terminal sends the same signal as the answer tone, it detects that fact and returns to the initial state. There is an effect that a good thing is obtained.

According to the seventh aspect of the present invention, the facsimile signal transmitting apparatus processes the control of the stuff / destuff of the demodulated facsimile signal by software, and performs the unit control in accordance with the transmission rate of the facsimile signal. The amount of information transmitted per time is determined, and stuff data and stuff control information for absorbing the difference between the transmission time of the facsimile signal and the multiplex transmission path are transmitted in a transmission format in which the stuff data is added to the facsimile signal. With this configuration, it is possible to greatly reduce the hardware scale of the apparatus, and it is also possible to obtain an apparatus that can perform stuff / destuff control at a transmission speed corresponding to the transmission rate of a facsimile signal. .

According to the eighth aspect of the present invention, the facsimile signal transmission apparatus further includes a redundancy control unit for the stuff data and stuff control information added to the demodulated facsimile signal when the demodulated facsimile signal is a control signal of 300 bps. , So that a control signal of 300 bps can also be provided which also works for error protection.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a facsimile signal transmission apparatus according to an embodiment of the present invention together with a DCME apparatus.

FIG. 2 is a block diagram illustrating a transmission system using a DCME device.

FIG. 3 is an explanatory diagram showing a format of an input / output signal of the DCME device.

FIG. 4 is a block diagram showing a facsimile signal transmission device according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram showing the format of input / output signals of a facsimile signal transmission device and a DCME device.

FIG. 6 is a block diagram showing a facsimile signal transmission device according to a second embodiment of the present invention.

FIG. 7 is a block diagram showing a facsimile signal transmission device according to a third embodiment of the present invention.

FIG. 8 is a block diagram showing a facsimile signal transmission device according to a fourth embodiment of the present invention.

FIG. 9 is a block diagram showing a facsimile signal transmission apparatus according to a fifth embodiment of the present invention.

FIG. 10 is an explanatory diagram for explaining a switching timing between a voice route and a facsimile route.

FIG. 11 is a flowchart showing an operation of a facsimile signal transmission apparatus according to a fifth embodiment of the present invention.

FIG. 12 is a flowchart showing the operation of a facsimile signal transmission apparatus according to a sixth embodiment of the present invention.

FIG. 13 is a flowchart showing an operation of the facsimile signal transmission apparatus according to the seventh embodiment of the present invention.

FIG. 14 is a block diagram showing a facsimile signal transmission device according to an eighth embodiment of the present invention.

FIG. 15 is an explanatory diagram showing a transmission format of facsimile demodulated data.

FIG. 16 is an explanatory diagram showing a transmission format of facsimile demodulated data in a ninth embodiment of the present invention.

FIG. 17 is a block diagram showing a conventional facsimile signal transmission device.

FIG. 18 is a block diagram showing another conventional facsimile signal transmission device.

FIG. 19 is a block diagram showing still another conventional facsimile signal transmission device.

[Explanation of symbols]

3 Modem (Facsimile Modulator / Demodulator) 4A, 4B, 4C, 4D, 4E Multiplexing Controller 9A, 9B Transmission Route Switcher 10 Reception Route Switcher 11 FAX Identifier (Facsimile Identifier) 12 Telephone Modem 13 FAX Modem Identifier ( Facsimile modem discriminator) 14 Tone detector 73 Multiplexer 76 Processor

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-62-143531 (JP, A) JP-A-62-262654 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04N 1/00-1/00 108 H04M 11/00-11/00 303

Claims (8)

(57) [Claims] 1. A multiplexer and the audio signal having the audio insert function, a facsimile signal and various data signals are provided between the plurality of transmission paths mixed, a signal of the plurality of transmission path in the multiplexer A facsimile signal transmission device for transferring the signal supplied from the multiplexing device to each of the transmission lines, and outputting the signals input from the plurality of transmission lines to an audio signal path leading to the multiplexing device. A transmission route switcher that switches whether or not, and outputs a control signal and image data by performing demodulation on a facsimile signal in the signal on any one of the transmission lines, and modulates the control signal and image data to generate a modulated wave. A plurality of facsimile modulators and demodulators to be output, and that any one of the facsimile modems demodulates and outputs a facsimile signal. Knowing that facsimile
An instruction to prevent the input signal of the transmission path demodulated by the modem from passing through the audio signal path is given to the transmission route switch, and the control signal and image data output by one or more facsimile modems are provided. the multiplexed output to a facsimile signal path to the multiplexer, and outputs a control signal and image data of the signal input from the facsimile signal path to one or a plurality of facsimile modem, either A multiplexing controller that outputs a reception switching instruction when the facsimile modem outputs a modulated wave, and outputs one of the audio signal path and the output of the facsimile modem to the plurality of transmission paths. a switch, receiving route for outputting a modulated wave in which the facsimile modem has output in response to the received switching instruction to the predetermined transmission path Facsimile signal transmitting apparatus characterized by comprising a switch. 2. The method according to claim 1, wherein signals on a plurality of transmission paths are introduced and each transmission is performed.
A facsimile discriminator for detecting a facsimile signal is provided for each path , and the multiplexing controller recognizes that the facsimile discriminator has detected the facsimile signal, and supplies a signal input from the transmission path to a facsimile modem. 2. The facsimile signal transmission device according to claim 1, wherein the instruction is given to the transmission route switch. 3. A facsimile modulator / demodulator provided in parallel with the facsimile modem.
A telephone modem to output a modulated wave modulates the data multiplexing control unit has output performs demodulation for a given signal of the signal input from the facsimile modem and the same transmission path Te, a plurality of transmission paths A facsimile modem detector for detecting a facsimile signal and a signal to be handled by the telephone modem for each transmission line by introducing a signal, and a multiplexing controller, wherein the facsimile modem identifier is a facsimile signal. 2. A facsimile signal transmission apparatus according to claim 1, wherein the facsimile signal transmission apparatus recognizes that a signal to be handled by the telephone modem is detected, and gives an instruction to supply a signal input from the transmission line to the facsimile modem and the telephone modem to the transmission route switch. . 4. A multiplexer and the audio signal having the audio insert function, a facsimile signal and various data signals are provided between the plurality of transmission paths mixed, a signal of the plurality of transmission path in the multiplexer A facsimile signal transmission device that transfers the signal supplied from the multiplexing device to each of the transmission lines, and a tone detector that detects an answer tone of the facsimile device from the signals input from the plurality of transmission lines. A plurality of facsimile modulators and demodulators that demodulate a facsimile signal in a signal on any one of the transmission paths and output a control signal and image data, and modulate the control signal and image data to output a modulated wave, When switching whether or not to output signals input from a plurality of transmission paths to an audio path leading to the multiplexing apparatus, In particular, a transmission route switch for switching whether or not to output signals input from the plurality of transmission paths to the facsimile modulator / demodulator, and a transmission related to the detection by recognizing that the tone detector has detected an answer tone. the physician a signal inputted from the road
An instruction to be supplied to any one of the facsimile modems is given to the transmission route switch, and it is recognized that the facsimile modem has demodulated and output the digital command signal, and a signal between the digital command signal and the subsequent training signal is received. In the no-signal section, an instruction is given to the transmission route switch to prevent a signal input from the transmission path related to the detection from passing through the audio signal path, and one or more of The control signal and the image data output from the facsimile modem are multiplexed and output to a facsimile signal path leading to the multiplexer, and the control signal and the image data among the signals input from the facsimile signal path are set to 1 And a multiplexing controller for outputting to a plurality of facsimile modems. 5. The facsimile signal transmission apparatus according to claim 4, wherein the multiplexing controller stops monitoring the facsimile signal by the facsimile modulator / demodulator when recognizing that the facsimile modem has demodulated and output the non-standard function setting signal. . 6. A multiplexing controller, wherein when a facsimile modem does not demodulate and output a digital command signal within a predetermined time after a tone detector detects an answer tone, a facsimile signal from the facsimile modem is output. 5. The facsimile signal transmission device according to claim 4, wherein monitoring of the facsimile is stopped. 7. A facsimile signal extracted from an input signal, demodulated by a demodulator of a facsimile modem, multiplexed with another demodulated facsimile signal in the same manner, and multiplexed on a different route from voice. In a facsimile signal transmission device for transmitting to the facsimile signal, the amount of information transmitted per unit time is determined according to the transmission rate of the facsimile signal, and the facsimile signal is transmitted between the facsimile signal and the transmission time of the multiplex transmission path. A facsimile signal transmission apparatus, comprising: a processor for setting a transmission format to which stuff data and stuff control information for absorbing a difference are added; and a multiplex processing unit for multiplexing a facsimile signal in the transmission format. 8. The processor according to claim 1, wherein said facsimile signal is equal to 30.
8. When the control signal is 0 bps, the stuff data and stuff control information to be added have redundancy.
A facsimile signal transmission device as described in the above.