JPH07170347A - Facsimile signal transmitter - Google Patents

Abstract

PURPOSE:To switch a facsimile signal transmitted as a voice signal or the like to a facsimile transmission system even in the middle of facsimile communication by supplying an input signal with a possibility of containing the facsimile signal to the side of a modem as well and fixing the facsimile signal. CONSTITUTION:When a signal identifier 57 detects a 2100Hz tone, it is reported. When the 2100Hz tone detection is reported, a multiplex controller 24 switches a transmission route switcher 29 so that the input signal can be supplied through a demodulation unit switcher 34 to demodulation units 32 and 33. When a modem 23 at any one of units 32 and 33 succeeds in the demodulation of a DCS signal, it is reported to the controller 24. The controller 24 switches the switcher 29 so that the input signal can be supplied only to the switcher 34. A transmission processor 35 switches the switcher 34 so that the signal can be supplied to either one of the units 32 and 33 corresponding to the contents of the DCS signal.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art FIG. 10 is a block diagram showing an example of a conventional facsimile signal transmission apparatus. In the figure, 1 is a facsimile modulator / demodulator (hereinafter referred to as a modem) that restores a facsimile signal modulated into an analog signal to a digital signal and modulates a digital facsimile signal into an analog signal, and 2 is demodulated by the modem 1. The fax signal is multiplexed with other signals and sent to the bearer side.
This is a multiplexer that separates a facsimile signal from the multiplexed signal from the bearer side and distributes it to the modem 1. The multiplexer 2 multiplexes, for example, a facsimile signal and an ADPCM-converted voice signal.

Reference numeral 3 is an input terminal for inputting a facsimile signal modulated into an analog signal from the trunk side to the modem 1, and 4 is an output terminal for outputting a facsimile signal demodulated into an analog signal by the modem 1 to the trunk side. Is. Reference numeral 5 is an output terminal for outputting the facsimile signal multiplexed by the multiplexer 2 to the bearer side, and 6 is input to the multiplexer 2 the facsimile signal sent from the bearer side to be demultiplexed. It is an input terminal.

Here, there is an exchange that accommodates voice terminals, data terminals, facsimile terminals, etc. on the trunk side, and the bearer side is connected to a high-speed line. In Figure 10, #
1 illustrates a case in which N modems 1 to #N and N input terminals 3 and output terminals 4 corresponding to the respective modems 1 are provided.

Next, the operation will be described. Modem 1
International Telegraph and Telephone Advisory Committee (CCITT) Recommendation V. 21, V.I. 27 ter, V.I. 29, V33, V1
It has a modulation and demodulation function conforming to 7. A facsimile signal based on an analog signal input to any one of the input terminals 3 on the trunk side corresponds to the modem 1 corresponding to the input terminal 3.
Is restored to a digital signal of 9600 bps.

The digital signal restored by the modem 1 is sent to the multiplexer 2. The multiplexer 2 multiplexes the digital signal with other signals and outputs the multiplexed signal from the output terminal 5 on the bearer side to the high speed line. When receiving a signal from a high-speed line, the multiplexer 2 takes out a digitized facsimile signal from the multiplexed signal input from the bearer side input terminal 6 and passes the digital signal to one of the modems 1. . The modem 1 modulates the received digital signal and outputs a facsimile signal based on an analog signal, which is a modulated wave, from the corresponding output terminal 4. In this case, transmission / reception of the facsimile signal is performed in real time. Further, the N modems 1 can operate in parallel within the range of the multiplexing capability of the multiplexer 2.

In this system, the signal input to the input terminal 3 on the trunk side is limited to the facsimile signal. Therefore, in front of the input terminal 3 on the trunk side, the audio signal is controlled so as not to be supplied to the input terminal 3. For example, the trunk side has a circuit for distinguishing a facsimile signal from a voice signal, and when the start of the facsimile signal is detected by detecting a 2100 Hz tone, the trunk side signal is supplied to the input terminal 3. At the same time, the multiplexer 2 controls so that the signal received from the high speed line is also supplied to the modem 1. Also, 2100H
The opposite system is notified that the z tone is detected. Two
The system notified of the 100 Hz tone detection controls the trunk side signal to be supplied to the input terminal 3. When the system detecting the 2100 Hz tone detects that the modem 1 detects the DCS signal from the received signal from the high speed line, the system determines that the communication channel is used for facsimile communication.

FIG. 11 is a functional block diagram showing an example of processing for a facsimile signal for multiplexing. In the figure, 1a is a demodulation unit of the modem 1, 1b is a modulation unit, and 7 is 30 in the digital signal output from the demodulation unit 1a.
An oversampling circuit that performs oversampling only on the control signal of 0 bps, and 8 is a stuffing control circuit that performs stuffing control on the data output from the oversampling circuit 7.

Reference numeral 9 is a transmission gate for controlling passage of stuff-controlled data, and 10 is a transmission side multiplexing transmission line for transmitting the data passed through the transmission gate 9. 11
Is a multiplexing transmission line on the receiving side through which the data subjected to the stuff processing by the opposite device is transmitted, and 12 is a receiving gate for controlling the passage thereof.

Reference numeral 13 is a destuffing control circuit for performing destuffing control on the data passing through the reception gate 12, and 14 is speed conversion of a control signal of 300 bps which is oversampled in the data subjected to destuffing control. And the data after speed conversion is processed by the modulator 1 of the modem 1.
It is a speed converter which outputs to b.

Next, the operation will be described. The analog facsimile signal input to the input terminal 3 is converted into a digital facsimile signal by the demodulation unit 1 a of the modem 1 and input to the oversampling circuit 7.

When the facsimile signal, that is, the demodulation data output from the demodulation unit 1a is a control signal of 300 bps, the oversampling circuit 7 sets the demodulation data synchronized with the demodulation clock extracted by the demodulation unit 1a to 9600 bps. Convert to a corresponding signal. After that, the stuff control circuit 8 provides stuff data to absorb the difference from the transmission clock of the multiplex transmission line 10 on the transmitting side, and further adds stuff control information.

If the demodulated data output from the demodulator 1a is high-speed data such as 9600 bps, the oversampling process is not performed and only the stuff control is performed. The stuff-controlled data is added with the stuff-control information, and becomes a signal corresponding to, for example, 10 kbps for one facsimile signal.

The data placed on the multiplex transmission line 11 on the receiving side passes through the receiving gate 12 and is input to the destuffing control circuit 13. The destuff control circuit 13 first determines whether the stuff data is regular data or dummy data based on the stuff control information included in the input data.

Here, when the data output from the destuffing control circuit 13 is a control signal of 300 bps, for example, the speed converter 14 speed-converts the received signal of 9600 bps into a signal of 300 bps. The data thus destuffed is input to the modulation unit 1b in synchronization with the modulation clock given from the modulation unit 1b of the modem 1, modulated and becomes an analog facsimile signal, and output to the output terminal 4.

FIG. 12 is a block diagram showing another conventional facsimile signal transmitting apparatus for multiplexing and transmitting facsimile signals. In the figure, reference numeral 15 is a reception control unit that performs a receiving operation in opposition to a facsimile terminal existing on the trunk side (specifically, it exists via an exchange or the like), and 16 is a facsimile terminal existing on the trunk side. Is a transmission control unit that performs a transmission operation in opposition to. Reference numeral 17 is a reception data storage device for storing the image data received by the reception control unit 15, and 18 is a transmission data storage device for storing the image data to be transmitted by the transmission control unit 16. In addition, FIG.
N reception control units 15 and transmission control units 1 # 1 to #N
The case where 6 is provided is illustrated.

Next, the operation will be described. The arbitrary reception control unit 15 communicates with the facsimile terminal performing the transmission operation via the corresponding input terminal 3 and output terminal 4 on the trunk side. Then, the received image data is stored in the received data storage unit 17.

When there is an empty channel on the high-speed line side, the multiplexer 2 sends the image data in the received data storage 17 from the output terminal 5 on the bearer side as a part of the multiplexed signal. On the other hand, the multiplexed signal input from the high speed line side is input to the multiplexer 2 from the input terminal 6 on the bearer side. Then, the multiplexing device 2 extracts the image data from the multiplexed signal and stores the image data in the transmission data storage 18.

One of the transmission control units 16 calls a facsimile terminal which is a receiver and communicates with the facsimile terminal. That is, the transmission control unit 16 functions as a facsimile transmitter and transmits the image data in the transmission data storage 18 to the facsimile terminal. In addition,
When the transfer destination facsimile terminal is already in use, the transmission control unit 16 performs a retransmission operation after a predetermined time. Further, the number of transmission control units 16 shown in N units in FIG. 12 may be one. However, in that case, the average time that the image data stays in the transmission data storage 18 becomes long, and the immediacy of the facsimile communication is lost.

[0020]

Since the conventional facsimile signal transmission apparatus is constructed as described above, it is possible to use 210
If the 0 Hz tone or the DCS signal is not detected, the facsimile signal cannot be transmitted through the modem 1 or the like, and the facsimile signal is treated in the same manner as the voice signal and transmitted. That is, it is transmitted after being converted to ADPCM. This situation continues until the end of facsimile communication. Therefore, even if the configuration shown in FIGS. 10 and 12 is provided, if the 2100 Hz tone or the DCS signal is not detected, the effect of improving the transmission efficiency by the configuration (this is called a facsimile transmission system) is exhibited. There was a problem that it was not done.

The present invention has been made to solve the above problems, and a facsimile signal which is transmitted as a voice signal or the like can be switched to the facsimile transmission system even during the middle of the facsimile communication. The purpose is to obtain a signal transmission device.

[0022]

According to a first aspect of the present invention, there is provided a facsimile signal transmission apparatus, wherein a modem for decoding an analog facsimile signal and a demodulated output of the modem when an input signal is a facsimile signal are used as a voice signal or a voice signal. A multiplexing controller that supplies the multiplexer with a facsimile route that is different from the data signal transfer route, and a transmission route that supplies the input signal to the voice signal and / or data signal transfer route and / or the modem side. The switching device, a signal discriminator which instructs the transmission route switching device to supply the input signal to the modem side when the input signal may be a facsimile signal, and the modem detects the facsimile procedure signal. In this case, the multiplexing controller is requested to use the facsimile route and the input signal is supplied only to the modem side. It is obtained by a route control means instructs.

Further, in the facsimile signal transmitting apparatus according to the invention of claim 2, in the facsimile signal transmitting apparatus according to the invention of claim 1, the route control means causes the modem to detect a high speed facsimile signal or a facsimile procedure signal. In this case, the multiplexing controller is requested to use the facsimile route and is instructed to supply the input signal only to the modem side.

The facsimile signal transmitting apparatus according to the invention of claim 3 is the facsimile signal transmitting apparatus according to the invention of claim 2, wherein the route control means further detects EOL from the demodulation result by the modem. ,
The configuration is such that a fill is inserted into a high-speed facsimile signal and an instruction to supply the input signal only to the modem side is issued.

[0025]

The signal discriminator according to the invention described in claim 1 is
The input signal is constantly monitored, and when there is a possibility that a facsimile signal is included, the input signal is also supplied to the modem side. When detecting the facsimile procedure signal from the input signal, the route control means determines that the input signal is the facsimile signal.

When the high-speed facsimile signal is detected from the input signal, the route control means in the invention of claim 2 determines that the input signal is the facsimile signal.

When the high-speed facsimile signal is detected from the input signal, the route control means according to the third aspect of the present invention determines that the input signal is the facsimile signal and controls the switching in the state where the fill is added to the EOL. Do.

[0028]

EXAMPLES Example 1. Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a facsimile signal transmitting apparatus according to an embodiment of the present invention. In the figure, 21 is an input terminal on the trunk side for transmitting voice signals and facsimile signals, and 22 is an output terminal on the trunk side. Is. The input terminal 21 and the output terminal 22 on the trunk side are connected to an exchange that accommodates, for example, a voice terminal or a facsimile terminal. Reference numeral 23 is a modem for modulating / demodulating a facsimile signal, and 24 is a multiplexing controller for controlling multiplexing of facsimile control signals and image data.

Reference numeral 25 is a bearer side voice output terminal for transferring a voice signal, 26 is a bearer side voice input terminal, 27 is a bearer side facsimile output terminal for transmitting a facsimile signal, and 28 is also a bearer side This is a facsimile input terminal. The route connected to the voice output terminal 25 and the voice input terminal 26 on the bearer side constitutes a voice signal route (hereinafter referred to as a voice route),
The route connected to the facsimile output terminal 27 and the facsimile input terminal 28 on the bearer side constitutes a facsimile signal path (hereinafter referred to as a facsimile route).

29 is in accordance with the command from the multiplexing controller 24,
It is a transmission route switching device that switches whether the signal input from the input terminal 21 on the trunk side is output to the output terminal 25 of the voice route, the modem 23 side, or both. Reference numeral 30 is a reception route switching device that switches between transmitting the output of the modem 23 from the trunk side output terminal 22 and transmitting the signal input to the voice route input terminal 26 from the trunk side output terminal 22.

32 is CCITT Recommendation V.35. 29, V.I. 27
ter and V.I. 21 is a demodulation unit (V.29 demodulation unit) equipped with a modem 23 conforming to 21.
Recommendation V. 33, V.I. 17 and V.I. 21 is a demodulation unit (V.33 demodulation unit) provided with a modem 23 conforming to 21.

Reference numeral 34 is a V.V. 29 demodulation unit 3
2 and V. 33 is a demodulation unit switch for switching to any of the 33 demodulation units 33. 35 is V. 29 is a transmission processor having a function of controlling switching of the demodulation unit switch 34 in accordance with a unit switching instruction output from the 29 demodulation unit 32, and 36 is a reception processor having a similar control function of the demodulation unit switch 34. Reference numeral 57 is a signal discriminator for discriminating whether the signal input to the trunk input 3 is a facsimile signal or a voice signal. The transmission processor 35 also serves as route control means.

FIG. 2 shows a digital multiplexer (hereinafter referred to as "DCME") having a voice insertion function (hereinafter referred to as "DSI function").
It is called a device. 3 is a block diagram showing an example of a connection form of FIG. The trunk input 47 is input to the DCME device 39,
The trunk output 48 is output from the DCME device 39. The trunk input 51 is input to the DCME device 40,
The trunk output 50 is output from the DCME device 40. The DCME devices 39 and 40 are connected by high-speed digital lines 41 and 42. The trunk input 47 and the trunk output 48, and the trunk input 51 and the trunk output 50 are respectively connected to the exchange.

Regarding the DCME device, CCITT Recommendation Q. 50, and these DCME devices 39, 40 are also recommended by Q.50. Complies with 50. The DCME device 39 is shown in FIG.
A signal is received from the trunk side in the signal format 53 as shown in the lower part of FIG. Then, it is detected whether or not the voice channel is voiced, and if voiced, a free channel on the bearer side is searched. If there is an empty channel, a voice signal is set to that channel and the signal is sent to the bearer side in the signal format 52 shown in the upper part of FIG. When the voice channel on the trunk side becomes unvoiced, the signal on the corresponding channel on the bearer side is stopped. Then, the connection state of each channel is set to the assignment channel (AC).

When the signal in the signal format 52 is input from the bearer side, the partner DCME device 40 reconfigures the signal and outputs it to the trunk output 50. In this way, the sound signal input to the DCME device 39 is D
It is output from the CME device 40 to the corresponding voice channel on the trunk side. As described above, on the bearer side,
Since only audio signals are transmitted, the number of channels can be reduced. The number of channels is reduced to 1/4 to 1/5 by the ADPCM function that reduces the number of transmission bits together with the DSI function.

By the way, Recommendation Q. 64 kbp for 50
s Clear channel and voice band data transmission path setting request signal are defined. Since the signal on the voice channel on the bearer side has a low transmission rate by adopting ADPCM, terminal data of 64 kbps cannot be transmitted on that channel. However, when the 64 kbps channel prepared on the bearer side is used, such data can be transmitted. That is, when such data is generated, the DCME device 19 receives 64 kbps.
On-demand request, and a 64 kbps clear channel may be set.

The 64 kbps clear channel on-demand request is output from the exchange or the like in the configuration shown in FIG. That is, the exchange or the like sends out the 64 kbps on-demand request signal (SIG) using the time slot (TS) # 16 in the signal format 53 on the trunk side shown in the lower part of FIG. Then, an empty channel is searched, and CH # 1 and C in the signal format 53 are searched.
A 64 kbps clear channel as shown by H # 2 is set as an empty channel.

FIG. 4 shows the facsimile signal transmission device as a DCM.
It is a system configuration diagram of a system connected by a high-speed digital line via E devices 39 and 40. In the figure, 3
Reference numerals 7 and 38 are facsimile signal transmission devices each having the configuration shown in FIG.

Reference numeral 43 is a voice route formed by a route connected to the voice route of the voice output terminal 25 and the voice input terminal 26 on the bearer side of the facsimile signal transmission device 37, and 44 is the facsimile output terminal 27 on the bearer side. And a facsimile route formed by a route connected to the facsimile input terminal 28. 45
Is an output terminal on the trunk side of the facsimile signal transmission device 38, and 46 is an input terminal on the trunk side.

The 64 kbps clear channel is assigned when an on-demand request is generated,
It is assigned to a random position in the signal format 53. Then, the facsimile signal transmission devices 37 and 38 shown in FIG. 4 issue the on-demand request to the DCME devices 39 and 40, that is, the recommended Q. Fifty
A 64 kbps clear channel setting function is used to transmit a facsimile signal.

Next, the operation will be described with reference to FIGS. The signal input to the input terminal 21 on the trunk side is first supplied to the output terminal 25 of the voice route and the modem 23 by the transmission route switch 29.
Until the modem 23 detects a facsimile signal, the signal on the trunk side is sent to the DCM via the output terminal 25 of the voice route.
E device 39. As described above, the DCME device 39 transfers the sound signal using the idle channel.

If the signal on the trunk side is formed by the signal format 55 shown in FIG. 5 and the facsimile signal is set in TS # 1, the modem 23 will demodulate the facsimile control signal from the facsimile signal. . Note that D-A conversion is required before demodulation,
To simplify the description, the description of the process is omitted below. The demodulation result is notified to the multiplexing controller 24.

When the multiplexing controller 24 recognizes that the modem 23 demodulates and outputs the control signal, the multiplexing controller 24 gives a switching instruction to the transmission route switcher 29. The transmission route switch 29 prevents the trunk side signal from being output to the output terminal 25 of the voice route in response to the switching instruction. As a result, the output of the output terminal 25 of the voice route becomes silent.

Further, the multiplexing controller 24 uses TS # 16 in the signal format 54 of the facsimile route shown in FIG.
To set the 64 kbps clear channel setting to DCM
E Device 39 is requested. Further, the multiplexing controller 24
As shown in FIG. 5, the output of the modem 23 is set to CH # 1 and transferred to the DCME device 39. Here, CH # 1 in the signal format 54 is of 64 kbps, and if the image data of the facsimile is of 9.6 kbps, it can be divided into 6 sub-channels as shown in FIG. That is, the output of the plurality of modems 23 is changed to CH # 1.
Can be set to. If the transmission route is lower than 9.6 kbps, more subchannels can be set.

When the DCME device 39 receives the on-demand request for the 64 kbps clear channel, it searches for an empty channel on the bearer side, and as shown in FIG.
CH # 1 which is a 4 kbps clear channel is set.
The control signal and image data of the facsimile are CH # 1
Is transmitted to the DCME device 40 on the other side. The DCME device 40 which received it transfers the content of CH # 1 to the facsimile signal transmission device 38.

Further, the multiplexing controller 24 exchanges information with the multiplexing controller of the facsimile signal transmitting device 38 on the other side so that the signal format 5 of the facsimile route is transmitted.
4 sets a FAX assignment channel (hereinafter referred to as ACF). In this ACF, a transmission rate of image data, an array of multiplexed data, a supplemental status of 64 kbps clear channel, a usage status, etc. are set.

This ACF is sent from the multiplexing controller 24 to the DCM.
Transferred to the E device 39, the DCME device 39 sets it in the signal format 52 on the bearer side and sends it to the DCME device 40. The ACF is further transferred to the multiplexing controller 24 of the facsimile signal transmission device 38. The other side multiplexing controller 24 issues a switching instruction to the reception route switcher 30 based on the contents of the ACF, and passes the received contents of CH # 1 to the modem 23. The modem 23 modulates the signal given from the multiplexing controller 24, puts the modulated wave on the facsimile channel F1 of TS # 1 in the signal format 55, and outputs it to the reception route switcher 30. The reception route switcher 30 outputs the output of the modem to the trunk side according to the instruction from the multiplexing controller 24, so that the output of the modem 23 is output from the trunk side output terminal 45.

When the multiplexing controller 24 recognizes the end of the facsimile communication according to the content of the control signal demodulated and output by the modem 23, the ACF notifies the other party of the multiplexing controller 24 of the fact. Also, the transmission route switch 2
A switching instruction is given to 9 so that the trunk side output is output to the output terminal 25 of the voice route. Further, the multiplexing controller 24 on the partner side gives a switching instruction to the reception route switcher 30 so that the input signal of the input terminal 26 of the voice route is output to the trunk side.

After that, the DCME device 39 detects the C on the bearer side.
Release H # 1. As a result, the channel that was CH # 1 becomes an empty channel. A new 64 kbps clear channel is set when another facsimile communication is started while the facsimile signal is being transmitted by CH # 1. The channel not used as the 64 kbps clear channel is used for voice transmission using the DSI function. Therefore, each channel on the bearer side is efficiently used for the voice signal and the facsimile signal, and the transmission efficiency of the system shown in FIG. 4 is higher than the system efficiency of only the DCME devices 39 and 40 shown in FIG.

Next, the specific operation of the facsimile signal transmission apparatus will be described with reference to FIGS. 6 and 7. When the signal discriminator 57 detects the 2100 Hz tone in the opposite system, the fact is notified. 2100H
When the z-tone detection is notified (step ST1), the multiplexing controller 24 causes the transmission route switcher 29 to supply the input signal to the demodulation units 32 and 33 through the demodulation unit switcher 34. Switch (step ST2).

When either of the modems 23 in the demodulation units 32 and 33 succeeds in demodulating the DCS signal (step ST3), the multiplexing controller 24 is notified of that fact. The multiplexing controller 24 controls the transmission route switch 2 so that the input signal is supplied only to the demodulation unit switch 34.
9 is switched (step ST4). Transmit processor 3
5 is a demodulation unit 32, depending on the content of the DCS signal,
The demodulation unit switch 34 is switched so that the signal is supplied to any of 33 (steps ST5 and ST).
6, ST7).

Here, when a facsimile machine which does not handle the CED signal is connected, the 2100 Hz tone cannot be detected. Also, due to line failure, DC
In some cases, detection of the S signal may not succeed. In such a case, the processes of steps ST4 to ST7 are not executed. However, in this embodiment, the signal discriminator 57 is provided before the transmission route switch 29, and the signal discriminator 57 constantly monitors the input signal as shown in the flowchart of FIG.

That is, when the signal discriminator 57 detects that the input signal is a voice signal, the signal discriminator 57 controls the transmission route switch 29 so that the input signal is not supplied to the demodulation unit switch 34 ( Step ST1
1, ST12, ST13). However, when it is detected that the input signal is not the voice signal, the transmission route switch 29 is controlled so that the input signal is supplied to the demodulation unit switch 34. Then, the input signal is the demodulation unit 3
2 and 33 (step ST14).

Either the modem 23 of the demodulation units 32, 33 is a V. If the 21 signals are successfully demodulated, that is,
When a flag signal that continues for a certain time is detected, it is determined that a facsimile procedure signal has been detected, and the fact that a facsimile signal has been detected is notified to the multiplexing controller 24 or the transmission processor 35 and the reception processor 36 (steps ST16 and ST17). If necessary, the other system will also be notified. The multiplexing controller 24 or the transmission processor 35 controls the transmission route switch 29 so that no signal is supplied to the output terminal 25 of the voice route (step ST19).

As described above, the input signal is supplied to the demodulation units 32 and 33, and the multiplexing controller 24 outputs the demodulated facsimile signal to the output terminal 5 of the facsimile route (step ST20). Also, if necessary, the multiplexing controller 24 or the reception processor 36 switches the reception route switch 29 so that the signals from the demodulation units 32 and 33 are output to the output terminal 4.

When the facsimile signal cannot be detected, the transmission route switch 29 is switched under the control of the multiplexing controller 24 or the transmission processor 35 so that the input signal is not supplied to the demodulation unit switch 34 ( Steps ST17, ST13).

In step ST16, the CCI
TT Recommendation T. A facsimile signal may be detected when the signal of 30 is detected. When a facsimile signal is detected, after confirming that the modem is in the no signal state, the transmission route switch 2
Switching of 9 is executed (step ST18). By controlling in this way, adverse effects at the time of switching to the signal are prevented.

Example 2. In the above embodiment, after the facsimile communication is started, the V. The case where the signal route is switched from the voice route to the facsimile route when the facsimile signal by 21 is detected is shown, but it is also possible to switch to the facsimile route when the image signal is detected. In that case, the control is performed as shown in the flowchart of FIG. The device configuration may be that shown in FIG.

After the voice discriminator 57 detects the non-voice signal, the modem 23 sends V. When the facsimile signal by 21 cannot be produced, the modem 23 in the demodulation units 32, 33 is set to each modulation / demodulation mode for high speed signals. When the modem 23 in a certain mode normally detects the training signal of the high speed facsimile signal, the fact is notified to the multiplexing controller 24 or the transmission processor 35 and the reception processor 36 (step ST21). Then,
The transmission processor 35 and the like perform switching control as in the case of the first embodiment (steps ST18 to S).
T20).

Here, again, the transmission route switching device 29
The switching is performed after confirming that the modem is in a non-signal state. Further, the detection processing of the high-speed facsimile signal may be performed by detecting EOL included in the image signal instead of detecting the training signal.

Example 3. FIG. 9 is a flow chart showing the operation of the facsimile signal transmission apparatus according to the third embodiment of the present invention. The device configuration may be that shown in FIG.

In this embodiment, as in the case of the first embodiment, the V. When the facsimile signal by 21 is detected, the signal route is switched from the voice route to the facsimile route (steps ST14 to ST19), and when the image signal is detected, it is switched to the facsimile route. However, if the modem 23 is EO
When L is detected (step ST31), a fill (FILL) is inserted after the EOL (step ST3).
2). In this case, while inserting the FILL, the transmission processor 35 and the like perform switching control as in the case of the first embodiment (steps ST18 to ST20).

The facsimile signal transmission device of the opposite system replaces the error with FILL when an error occurs in the FILL portion when the route is switched and when the error can be detected. Since the facsimile apparatus on the opposite system side discards the FILL at the time of decoding the high speed facsimile signal, the adverse effect on the image signal can be suppressed by such control.

In this case, the switching control is performed without waiting for the end of the image signal as in the second embodiment.
The facsimile route is used more effectively.

[0065]

As described above, according to the first aspect of the present invention, the facsimile signal transmission apparatus uses the modem to input the input signal to the transmission route switcher when the input signal may be a facsimile signal. And a signal discriminator that issues an instruction to supply the same, and an instruction to supply the input signal only to the modem side when the modem detects a facsimile procedure signal and requests the multiplexing controller to use the facsimile route. Since it is configured to include a route control means for outputting, a facsimile signal can be detected even during the facsimile communication, and the facsimile route can be used in the middle of the facsimile communication. It has the effect of improving the usage efficiency.

According to the second aspect of the invention, the facsimile signal transmission apparatus supplies the input signal to the modem side also to the transmission route switching device when the input signal may be a facsimile signal. It has a signal discriminator for issuing an instruction to perform, and a route control means for issuing an instruction to supply the input signal only to the modem side when the modem detects a high-speed facsimile signal or a facsimile procedure signal. The use of the facsimile route can be started even at the end of the high-speed facsimile signal, and the use efficiency of the high-speed digital line is further improved.

According to the invention described in claim 3,
Since the facsimile signal transmission apparatus has a structure including route control means for issuing an instruction to supply the input signal only to the modem side while inserting the FILL after detecting the EOL when the high speed facsimile signal is detected, The use of the facsimile route can be started even during the transmission of the facsimile signal, which has the effect of further improving the use efficiency of the high-speed digital line.

[Brief description of drawings]

FIG. 1 is a block diagram showing a facsimile signal transmission device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a connection form of a DCME device.

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

FIG. 4 is a system configuration diagram of a system in which facsimile signal transmission devices are connected by a high-speed digital line via a DCME device.

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

FIG. 6 is a flowchart showing an operation of the facsimile signal transmission device.

FIG. 7 is a flowchart showing the operation of the facsimile signal transmission apparatus according to the first embodiment of the present invention.

FIG. 8 is a flowchart showing the operation of the facsimile signal transmission apparatus according to the second embodiment of the present invention.

FIG. 9 is a flowchart showing the operation of the facsimile signal transmission apparatus according to the first embodiment of the present invention.

FIG. 10 is a block diagram showing a conventional facsimile signal transmission device.

FIG. 11 is a block diagram showing a functional configuration of a conventional facsimile signal transmission device.

FIG. 12 is a block diagram showing another conventional facsimile signal transmission device.

[Explanation of symbols]

 23 modem 24 multiplexing controller 29 transmission route switch 35 transmission processor (route control means) 57 signal discriminator

Claims (3)

[Claims] 1. A facsimile signal transmission apparatus for demodulating a facsimile signal of an input signal in which a facsimile signal and a voice signal or a data signal are mixed and outputting the demodulated facsimile signal to a multiplexer, and a modem for decoding an analog facsimile signal; When the input signal is a facsimile signal, a demodulation output of the modem is supplied to the multiplexer by a facsimile route different from the transfer route of the voice signal or the data signal, and the input signal is a voice signal or a voice signal. A transmission route switcher for supplying the data signal transfer route and / or the modem side, and an input signal to the transmission route switcher when the input signal may be a facsimile signal. And a signal discriminator that gives an instruction to supply the When a procedure signal is detected, the multiplexing controller is requested to use a facsimile route, and route control means for issuing an instruction to supply the input signal only to the modem side is provided. Facsimile signal transmission device. 2. A facsimile signal transmission apparatus for demodulating a facsimile signal of an input signal in which a facsimile signal and a voice signal or a data signal are mixed and outputting the demodulated facsimile signal to a multiplexer, and a modem for decoding an analog facsimile signal; When the input signal is a facsimile signal, a demodulation output of the modem is supplied to the multiplexer by a facsimile route different from the transfer route of the voice signal or the data signal, and the input signal is a voice signal or a voice signal. A transmission route switcher for supplying the data signal transfer route and / or the modem side, and an input signal to the transmission route switcher when the input signal may be a facsimile signal. A signal discriminator which gives an instruction to supply the modem also to the modem, and the modem is a high-speed fax machine. Route control means for requesting the use of a facsimile route to the multiplexing controller when detecting a millimeter signal or a facsimile procedure signal and for issuing an instruction to supply the input signal only to the modem side. A facsimile signal transmission device characterized by: 3. The facsimile machine according to claim 2, wherein the route control means, after detecting the EOL from the demodulation result by the modem, issues an instruction to supply the input signal only to the modem side while inserting the fill into the high speed facsimile signal. Signal transmission equipment.