JP3280573B2 - Facsimile relay 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 relay transmission apparatus for converting a facsimile signal into a data signal and transmitting the data signal.

[0002]

2. Description of the Related Art A facsimile signal conversion / reproduction device is used in order to make effective use of the line capacity when using a digital line. Normally, a facsimile signal converted into a data signal by a facsimile signal conversion / reproduction device is transmitted in a long-distance digital line, and a normal facsimile signal is transmitted and exchanged in a short-distance digital line between devices. Hereinafter, a long-distance digital line is referred to as a transmission line.

FIG. 5 is a block diagram showing a configuration example of a facsimile signal transmission mode in which facsimile signal conversion / reproduction is repeated twice. In the transmission mode shown in FIG.
The facsimile signal converted into a data signal by the A station 61 passes through a transmission line (digital line) 72, is reproduced by the relay station 62 into a facsimile signal, and is exchanged by the exchange 66. At this time, if the connection destination is the B station 63, the reproduced facsimile signal is converted into a data signal again and transmitted through the transmission path 75.

In FIG. 5, reference numerals 64 and 67 denote facsimile relay transmission devices having facsimile signal converters 71 and 74 provided in an A station 61 and a relay station 62, respectively, and 65 and 68 denote relay stations 62 and B stations 63. Facsimile reproducing devices 73 and 76 provided in
Is a facsimile relay apparatus having the following.

[0005]

In the example shown in FIG. 5, the facsimile signal of the sender is transmitted to the receiver via facsimile signal conversion and reproduction twice. However, in general, processing time is required for facsimile conversion reproduction performed between facsimile terminals via a facsimile relay transmission device. Therefore, there is no problem if the delay time on the transmission line in the processing time is short, but if the delay time is long, facsimile communication may end abnormally due to collision of facsimile commands. That is, if the facsimile signal conversion / reproduction is repeated a plurality of times, there is a possibility that the delay time is increased and communication becomes impossible.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a facsimile relay transmission apparatus which solves the above-mentioned problem and performs good facsimile communication even when a multi-stage facsimile relay transmission apparatus is used between facsimile terminals. And

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a facsimile relay including a facsimile signal reproducing apparatus and a facsimile signal converting apparatus used in combination with the facsimile signal reproducing apparatus on the same channel. A transmission device, comprising: a facsimile signal reproducing unit for returning a facsimile signal converted to a data signal to an original facsimile signal; and embedding a data signal in a predetermined bit position.
Seen, - the exchange side 1 link signal generator that generates a first link signal to be output to a first pattern generator for generating a first pattern which is a predetermined bit pattern, the second pattern is a predetermined bit pattern A second pattern generation unit for generating the second pattern;
Is detected, the output of the one-link signal generator is switched off.
If the facsimile signal is not detected,
Output mode and output to the bit pattern embedding unit.
A mode switching unit and the facsimile signal conversion device
When a turn or a second pattern is detected,
The second pattern is applied to the csimilitary signal or the one link signal.
Embed the first pattern when not detecting and embedding
A bit pattern embedding unit Toka Ranaru facsimile signal reproducing apparatus for outputting to the exchange side, the data to retrieve the facsimile signal conversion unit for data signaling facsimile signal, a data signal from a predetermined bit position of a signal input from the exchange side a signal extracting unit, the facsimile signal or
A first pattern detecting monitoring unit that issues validate that the first pattern on a signal input from the exchange side is embedded, the second pattern is the facsimile signal or
A second pattern detection monitoring section that issues test that is embedded on a signal input from the exchange side, when the second pattern detection monitoring section detects the second pattern, the
Switch to the data signal extraction unit.
It is those with a facsimile signal converter comprising a mode switching unit that be output is switched to Akushimiri signal conversion unit, this configuration facsimile signal or 1
By having two types of bit patterns to be embedded in the link signal, the first pattern and the second pattern, even if the exchange connects only one of the communication paths, it does not enter the one-link relay state, and both communication paths are connected. Sometimes it becomes a one-link relay state.

Further, the present invention is a facsimile relay transmission device comprising a facsimile signal reproducing device and a facsimile signal converting device used in combination with the facsimile signal reproducing device on the same channel, wherein the data signal is converted into a data signal. a facsimile signal reproduction section for returning the facsimile signal into the original facsimile signal, data at a predetermined bit position
Embedded data signal, a first link signal generator for generating a first link signal to be output to the exchange side, the facsimile signal converter detects a predetermined bit pattern, and signaling
When the ring transmission signal and signaling reception signal are in the make state
In some cases, the output of the one-link signal generation unit is
The specified bit pattern is embedded and output to the exchange.
Otherwise, the facsimile signal is
Embedding the predetermined bit pattern in the output of the raw part
A facsimile signal reproducing unit comprising a bit pattern embedding unit for outputting to the exchange side, a facsimile signal conversion unit for converting the facsimile signal into a data signal, and extracting a data signal from a predetermined bit position of a signal inputted from the exchange side. a data signal extractor, the facsimile signal or are embedded said predetermined bit pattern on a signal input from the exchange side and the signaling transmission signal
When the signal and signaling reception signal are in the make state,
Switch to the data signal extractor, otherwise
A facsimile signal conversion device comprising a mode switching unit for switching to and outputting from the facsimile signal conversion unit. With this configuration, the condition for shifting to the one-link relay state includes a signaling state. After the call path from the calling side to the called side is completely established, the state shifts to the one-link relay state.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a relay station of a facsimile relay transmission apparatus for explaining a first embodiment of the present invention. In FIG. 1, a facsimile signal converter 17 and a facsimile signal reproducer 16 are shown. Facsimile relay transmission device 12 and facsimile signal reproduction device 19
The figure shows a state in which a facsimile relay transmission device 14 having a facsimile signal conversion device 18 is connected via an exchange 13.

The facsimile signal reproducing devices 16 and 19 and the facsimile signal converting devices 17 and 18 in the facsimile relay transmission devices 12 and 14 are composed of members having the same functions, respectively. I will do it.

That is, the facsimile signal reproducing units 21 and 51
Reproduces the data signal received from the transmission line 11 into the original facsimile signal. The one link signal generation units 22 and 52 are
A data signal received from the switch 11 is embedded in a predetermined bit position of a signal to be output to the exchange 13, and a one-link signal in which all other bits are fixed is generated. The first pattern generators 25 and 55 generate a predetermined bit pattern. The second pattern generators 26 and 56 generate patterns different from the first pattern determined in advance. The bit pattern embedding units 24 and 54 provide the output signals from the facsimile signal reproducing units 21 and 51 or the one link signal generating units 22 and 52 with the first pattern generating units 25 and 55 or the second pattern generating units 26 and 56, respectively. Embed the bit pattern.

The facsimile signal converters 31 and 41 are exchanges.
The facsimile signal received from the 13 side is converted into a data signal. The data signal extraction units 32 and 42 extract data signals from predetermined bit positions of one link signal received from the exchange 13 side. The first pattern detection monitoring units 34 and 44 detect whether or not the facsimile signal or one link signal has the first pattern. Second pattern detection monitor 35,
Reference numeral 45 detects whether the facsimile signal or one link signal has the second pattern.

When one of the first pattern detection / monitoring units 34, 44 and the second pattern detection / monitoring units 35, 45 detects a pattern, the OR circuits 36, 46
7 and 57 are switched to the b side, and if neither pattern is detected, the switch is made to the a side. Mode switching units 23, 33, 4
The switches 3 and 53 switch to the b side when the second pattern is detected by the second pattern detection monitoring sections 35 and 45, and switch to the a side when the second pattern is not detected.

In the exchange 13, when the facsimile relay transmission devices 12 and 14 are connected to the facsimile and in the unconnected state, the facsimile signal received by the facsimile relay transmission devices 12 and 14 is either the first pattern or the second pattern. Are not detected, the mode switching units 23 and 3
3, 43, 52 and the pattern switching units 27, 57 are on the a side. In this state, the facsimile signal reproducing device 16,
In 19, the data signal from the transmission line 11 is reproduced by the facsimile signal reproducing units 21 and 51, and the first pattern generating units 25 and 55 are reproduced.
Then, a facsimile signal in which the first pattern is embedded in the bit pattern embedding units 24 and 54 is output to the exchange 13. The bit pattern is embedded at a bit position and a cycle that do not affect the quality of the reproduced facsimile signal. FIG. 2 shows an example of this facsimile signal. The facsimile signal converters 17 and 18 convert the facsimile signals received from the exchange 13 into data signals at the facsimile signal converters 31 and 41 and output the data signals to the transmission lines 11 and 15.

When the exchange 13 is in an excessive connection state and only the communication path b is connected, the first pattern detection / monitoring section 34 detects the first pattern included in the facsimile signal output from the facsimile signal reproducing device 19. , Pattern switching unit
27 is switched to the b side. In this state, the mode switching unit 2
3 and 33 remain on the a side, and have not shifted to the one-link relay state.

Thereafter, when the exchange 13 is connected to both the communication paths a and b, the facsimile relay transmission device 14 monitors the second pattern included in the facsimile signal output from the facsimile signal reproduction device 16 by the second pattern detection unit. At 45, the pattern switching unit 57 is switched to the b side, and the mode switching units 43 and 53 are switched to the b side, and a one-link relay state is set. The facsimile relay transmission device 12 detects the second pattern included in the one link signal output from the facsimile signal reproduction device 19 by the second pattern detection monitoring unit 35, and switches the mode switching units 23 and 33 to the b side to perform one link. Move to the relay state.

In the one-link relay state, in the facsimile signal reproduction devices 16 and 19, the data signals received from the transmission lines 11 and 15 are determined in advance by the one-link signal generation units 22 and 52 for the signals to be output to the exchange 13 side. Embedded in bit position,
The second pattern generation unit 26 via the mode switching units 23 and 53
The second pattern from 56 is embedded in the bit pattern embedding sections 24 and 54 and output to the exchange 13.

FIG. 3 shows an example of the signal in this case. FIG.
This is an example in which an 8 kbit / s data signal is embedded in a 64 kbit / s PCM signal, and the data signal is embedded in the second bit from the lower order. The number of bits to be embedded may be determined according to the data signal conversion rate.

The facsimile signal converters 17 and 18 extract the data signals embedded in the predetermined bit positions from the one link signal received from the exchange 13 by the data signal extracting units 32 and 42, and the mode switching units 33 and 42. Output to the transmission path via 43.

When the communication is completed and the communication paths a and b are disconnected by the exchange 13, no pattern is detected by the second pattern detection monitoring sections 35 and 45, and the mode switching sections 23, 33, 43 and 53 are switched to the a side. To return to the normal state.

Thus, the facsimile signal or 1
By having two types of bit patterns to be embedded in the link signal, the first pattern and the second pattern, even if the exchange 13 connects only the communication path b, it does not enter the one-link relay state, and both the communication paths a and b are connected. After that, it becomes a one-link relay state.

FIG. 4 is a block diagram showing a configuration of a relay station of a facsimile relay transmission apparatus for explaining a second embodiment of the present invention. In FIG. 4, a facsimile signal converter 217 and a facsimile signal reproducer 216 are provided. The figure shows a state in which a facsimile relay transmission device 212 provided and a facsimile relay transmission device 214 provided with a facsimile signal reproduction device 219 and a facsimile signal conversion device 218 are connected via an exchange 213. Note that SS and SR in the figure are signaling bits used for transmission and reception for one voice channel, and one idle state is "0" during a call.

The facsimile signal reproduction devices 216 and 219 and the facsimile signal conversion devices 217 and 218 in the facsimile relay transmission devices 212 and 214 are composed of members having the same functions, respectively. I will do it.

That is, the facsimile signal reproducing units 221, 2
51 reproduces the data signal received from the transmission lines 211 and 215 into the original facsimile signal. 1-link signal generator 222, 252
Converts the data signals received from transmission lines 211 and 215
The signal to be output to the 213 side is embedded in a predetermined bit position, and all other bits generate a fixed one-link signal. Bit pattern generation / embedding units 224, 254
Embeds a predetermined bit pattern in an output signal from the facsimile signal generation units 221 and 251 or the one-link signal generation units 222 and 252.

The facsimile signal converters 231 and 241 convert the facsimile signal received from the exchange 213 into a data signal. The data signal extraction units 232 and 242 extract data signals from predetermined bit positions of one link signal received from the exchange 213 side. Bit pattern detection / monitoring unit 23
4 and 244 detect whether or not a facsimile signal or one link signal received from the exchange 213 side includes a predetermined bit pattern. When the bit pattern is detected, “1” is set. Is output.

The mode switching units 223, 233, 243, 253
The switches are switched by the mode switching signals from the D circuits 235 and 245. When the outputs from the bit pattern detection / monitoring units 234 and 244 and the signaling bits SS and SR are all “1”, the AND circuits 235 and 245 operate as mode switching units.
Switch 223, 233, 243, 253 to b side and select one of the inputs
If at least one is "0", the mode switching units 223, 233, 24
Switch 3,253 to a side.

In the exchange 213, the facsimile relay transmission device 21
In a state where 2,214 is not connected to the facsimile or not connected, the bit pattern detection / monitoring units 234,244
, The conditions of the AND circuits 235, 245 are not satisfied, and the mode switching units 223, 233, 24 of the facsimile relay transmission devices 212, 214 are not satisfied.
3, 253 is on the a side. At this time, the facsimile signal reproduction devices 216 and 219 convert the data signals from the transmission lines 211 and 215 into the facsimile signals reproduced by the facsimile signal reproduction units 221 and 251 and generate the bit pattern generation / embedding unit 22.
Embedding the bit pattern predetermined in 4,254,
Output to exchange 213.

FIG. 2 shows an example of the facsimile signal at this time. The facsimile signal converters 217 and 218
The facsimile signal received from 3 is converted into a data signal by facsimile signal converters 231, 241 and output to transmission lines 211, 215.

The transmission line 211 is a calling side, and the transmission line 215 is a called side. First, the foremost exchange that accommodates the calling side changes the transmission signaling from “0” to “1”, so that SR1 changes from “0” to “1”, and the exchange 213 prepares for an incoming call.
Thereafter, the dial information is input to exchange 213. The exchange 213 receives a part of the dial information and connects only the communication path b. The exchange 213 changes SS2 from “0” to “1” and activates the exchange accommodating the called side. The bit pattern embedded in the facsimile signal by the bit pattern generation / embedding unit 254 due to the connection of the transmission path b is detected by the bit pattern detecting / monitoring unit 234, and the output is changed from “0” to “1”.

The AND circuit 235 detects the bit pattern /
The output of the monitoring unit 234 and the reception signaling bit SR1 are “1”, but the transmission signaling bit SS1 is “0”, so that the mode switching units 223 and 233 remain at the “a” side.
In this state, the dial information sent from the transmission line 211 is passed to the exchange 213.

Thereafter, exchange 213 receives the dial information and completes the connection operation, and connects both communication paths a and b.
Since the transmission signaling SS1 remains "0",
The condition of the D circuit 235 does not change, and the mode switching units 223 and 233 remain on the a side.

When the communication path a is connected, the bit pattern embedded in the facsimile signal by the bit pattern generation / embedding unit 224 is detected by the bit pattern detecting / monitoring unit.
244, the output to the AND circuit 245 is changed from "0" to "1".
And The AND circuit 245 is a bit pattern detection / monitoring unit 2
Since the output of 44 and the transmission signaling bit SS2 are “1”, the reception signaling bit SR2 is “0”,
The mode switching units 243 and 253 remain at the a side.

Thereafter, the last exchange on the transmission line 215 side that accommodates the called side detects the response of the called side, and sets the signaling from the called side to the calling side to “1”, whereby the SR2
Changes from “0” to “1”. Exchanger 213 has SR2 "1"
, And SS1 is changed from “0” to “1” to notify the exchange accommodating the calling side of the response of the called party. Then, it enters a call state.

Since SR2 becomes "1", all the inputs of the AND circuit 245 become "1", and the mode switching units 243, 25
3 is switched to the b side to be in the one-link relay state. Also,
Since SS1 becomes "1", all the inputs of the AND circuit 235 become "1", and the mode switching units 223 and 233 are switched to the b side to be in the one-link relay state.

In the one-link relay state, in the facsimile signal reproducing devices 216 and 219, the data signals received from the transmission lines 211 and 215 are embedded in predetermined bit positions of the one-link signals by the one-link signal generators 222 and 252. Then, a predetermined bit pattern is embedded in the bit pattern generation / embedding units 224 and 254 via the mode switching units 223 and 253 and output to the exchange 213. FIG. 3 shows a signal example in this case. FIG. 3 shows an example in which an 8 kbit / s data signal is embedded in a 64 kbit / s PCM signal, and the data signal is embedded in the second bit from the lower order. The number of bits to be embedded may be determined according to the data signal conversion rate.

The facsimile signal converters 217 and 218 extract the data signals embedded in the predetermined bit positions from the one link signal received from the exchange 213 by the data signal extractors 232 and 242, and the mode switchers 233 and 242. 243
Via the transmission lines 211 and 215.

When the call is completed, SS1, SR1, SS
2, the signal of SR2 changes from "1" to "0". Since the communication paths a and b are disconnected, the bit pattern detection / monitoring unit 23
In 4,244, the bit pattern is not detected and the AND circuit
The output signals to 253 and 245 are "0". AND circuit 235, 2
At 45, when any one of the input signals becomes “0”, the mode switching units 223, 233, 243, and 253 are switched from the b side to the a side, and return to the original state.

Since the signaling SS and SR may be used for other purposes such as dial information in addition to indicating the call state, the S and S input to the AND circuits 235 and 245 are used.
To detect a call or idle state based on changes in S and SR,
A protection time by a timer is required.

By including the states of the signaling SS and SR in the condition for shifting to the one-link relay state in this way, the one-link relay state is established after the communication path from the calling side to the called side is completely established. Can be migrated to.

[0041]

As described above, according to the facsimile relay transmission apparatus of the present invention, even when the facsimile relay transmission apparatus is interposed between the facsimile terminals in multiple stages, the delay time does not increase, and the facsimile transmission is performed reliably and favorably. Communication is realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration in a relay station of a facsimile relay transmission device for explaining a first embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating a signal example when a bit pattern is embedded in a facsimile signal.

FIG. 3 is an explanatory diagram showing a signal example when a data signal and a bit pattern are embedded in one link signal.

FIG. 4 is a block diagram showing a configuration in a relay station of a facsimile relay transmission device for explaining a second embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration example of a facsimile signal transmission mode in which facsimile signal conversion and reproduction are repeated twice.

[Explanation of symbols]

11, 15, 211, 215: transmission line, 12, 14, 212, 214: facsimile relay transmission device, 16, 19, 216, 219: facsimile signal reproduction device, 17, 18, 217, 218: facsimile signal conversion device, 21, 51, 221, 251 ... facsimile signal reproducing unit, 22, 52, 222, 252 ... 1 link signal generating unit, 23,
33, 43, 53, 223, 233, 243, 253 ... mode switching unit, 2
4, 54 ... bit pattern embedding unit, 25, 55 ... first pattern generation unit, 26, 56 ... second pattern generation unit, 27, 57 ... pattern switching unit, 31, 41, 231, 241 ... facsimile signal conversion unit , 32, 42, 232, 242 ... data signal extractor, 3
4, 44: first pattern detection / monitoring unit, 35, 45: second pattern detection / monitoring unit, 36, 46: OR circuit, 224, 254: bit pattern generation / embedding unit, 234, 244: bit pattern detection / monitoring Part, 235, 245 ... AND circuit, a, b ...
Communication path, SS1, SR1, SS2, SR2 ... signaling signals.

Continuation of the front page (72) Inventor Mutsumi Takesa 3-1-1 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Inside Matsushita Communication Industrial Co., Ltd. (72) Inventor Reomi Hamakoshi 4-chome Tsunashima-Higashi, Kohoku-ku, Yokohama, Kanagawa Prefecture No. 1 Matsushita Communication Industrial Co., Ltd. (72) Inventor Toshio Washie 4-1-1 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture 1-1 Inside Matsushita Communication Industrial Co., Ltd. (72) Inventor Yasuhiro Hino, Kohoku, Yokohama-shi, Kanagawa 4-3-1 Tsunashima-ku, Ward Matsushita Communication Industrial Co., Ltd. (56) References JP-A-8-154138 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 1 / 00

Claims (2)

(57) [Claims] 1. A facsimile relay transmission device comprising a facsimile signal reproduction device and a facsimile signal conversion device used in combination with the facsimile signal reproduction device on the same channel, wherein a facsimile signal converted into a data signal is used. Facsimile
A facsimile signal reproducing unit back into re signal, predetermined bit
Embed a data signal at the location and output it to the exchange.
A first link signal generator for generating a link signal, a first pattern generator for generating a first pattern which is a predetermined bit <br/> DOO pattern, the second for generating the second pattern is a predetermined bit pattern A pattern generator, and the facsimile signal
When the conversion device detects the second pattern,
Switch to the output of the
Switch to the output of the facsimile signal playback unit and change the bit pattern
A mode switching unit for outputting to the image embedding unit;
The signal converter detects the first pattern or the second pattern.
Output, the facsimile signal or the one link
The second pattern is embedded in the lock signal.
A bit pattern embedding unit Toka Ranaru facsimile signal reproducing apparatus for outputting to the exchange side embed 1 pattern, and the facsimile signal converter for the data signals of the facsimile signal, the predetermined bit position of a signal input from the exchange side a data signal extractor which extracts data signals, before
Detect that the serial facsimile signal or said first pattern on a signal input from the exchange side is embedded
A first pattern detecting monitor you, the second pattern prior to
Serial facsimile signal or a second pattern detector monitoring unit that issues test that is embedded on a signal input from the exchange side, the second pattern detector monitoring unit and the second pattern
Switch to the data signal extractor when
If not detected, switch to the facsimile signal converter.
Facsimile relay transmission apparatus characterized by comprising: a facsimile signal converter comprising a mode switching section you output Te Toggles, a. 2. A facsimile relay transmission device comprising a facsimile signal reproduction device and a facsimile signal conversion device used in combination with the facsimile signal reproduction device on the same channel, wherein a facsimile signal converted to a data signal is used. Facsimile
A facsimile signal reproducing unit back into re signal, predetermined bit
Embed a data signal at the location and output it to the exchange.
A first link signal generator for generating a link signal, the fax <br/> Shimiri signal converter detects a predetermined bit pattern,
And the signaling transmission signal and the signaling reception signal are
The output of the one-link signal generation unit
The predetermined bit pattern is embedded in the
Side, and at other times the facsimile
The predetermined bit pattern for the output of the millimeter signal reproducing unit
Pattern embedding to embed a pattern and output it to the exchange
A facsimile signal reproducing apparatus comprising a part, and the facsimile signal converter for the data signals of the facsimile signal, a data signal extraction unit which extracts data signals from a predetermined bit position of a signal input from the exchange side, front
Serial predetermined bit pattern is embedded in a facsimile signal or a signal input from the exchange side,
And the signaling transmission signal and the signaling reception signal are
Switch to the data signal extractor when
A facsimile signal transmission device comprising: a facsimile signal conversion device configured to switch to the facsimile signal conversion unit and output a signal at other times.