JPH0465581B2 - - Google Patents

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to a facsimile device.

[Prior art]

Typically, facsimile devices use either an analog network such as a telephone network or a digital network as their transmission line. However, data communication between these line networks, such as data transmission from a facsimile device using an analog line network to a facsimile machine using a digital line network, is not possible.

Furthermore, since a facsimile device that can be shared by both line networks has not been realized in the past, there has been a problem in that, for example, data transmission between facsimile communication systems using an analog line network and facsimile communication systems using a digital line network is not possible. Ta.

〔the purpose〕

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a facsimile device that can be used commonly for analog line networks and digital line networks.

〔composition〕

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a schematic configuration of an embodiment of the present invention. In the figure, 1 is a scanner that performs two-dimensional scanning and photoelectric conversion of a transmitted original, 2 is a printer that records received images as dot images, and 3 is a DCR (code converter) that encodes transmitted image signals and decodes received data. 4 is a CCU (communication control unit) that executes transmission control for the telephone line network (that is, analog line network) and digital line, and 5 is for connecting this facsimile device F with the analog line network and the digital line network. of
NCU (Network Control Unit), 6 is SCU (Supervisor Control Unit) for controlling the operation mode and timing of the scanner 1, printer 2, DCR 3, CCU 4, and NCU 5, and 7 is the manual control unit between the operator and the facsimile machine F. This is an operation panel that serves as a machine interface. Further, B is a system bus line in the facsimile device F.

FIG. 2 shows how transmission information (image information) and transmission control signals are exchanged between the DCR 3, CCU 4, and NCU 5. DCR3 to CCU4
The signal SD applied to the NCU 5 is a transmission image signal obtained by DCR 3 encoding the output signal of the scanner 1, and the signal SD applied to the NCU 5 from the CCU 4.
_D11 is transmission data in which the CCU 4 frames the signal SD and a control signal according to a transmission control procedure related to a digital line network, for example, according to an HDLC procedure. Signal D ₁₂ applied from NCU5 to CCU4
is data transmitted from a partner station via a digital line network, and is a signal formed by subjecting encoded image signals and transmission control signals to frame processing similar to signal _D11 .

The signals D ₂₁ and D ₂₂ are transmission control signals, that is, CCITT, when a telephone network is used as the transmission line.
This is a signal based on the G3 facsimile control procedure referred to in Recommendation T-30. Further, the image signal received from the analog line network and the image signal included in the signal _D12 are added to the DCR3 as a received image signal RD.

This figure shows DCR3, CCU4 and NCU5.
The connection between the line and the system bus line B is omitted.

FIG. 3 shows details of the NCU 5. In the figure, 5a represents the above-mentioned signals D ₁₁ , D ₁₂ , D ₂₁ ,
D ₂₂ , an interface circuit for sending and receiving SD and RD, 5b an interface circuit for connecting this NCU 5 and system bus line B, 5
c is an internal bus line, 5d is a DSP (digital signal processor) that performs FSK modulation calculations for the transmitted image signal SD and signal D ₂₁ , and FSK demodulation calculation for the received image signal RD and signal D ₂₂ , and 5e is a DSP 5.
a digital/analog converter that converts the output data of d into an analog signal; and an analog/digital converter that converts the received signal input by the telephone line network interface circuit (hereinafter referred to as telephone I/F) 5f into a digital signal. Signal converter consisting of 5g
5 is a data memory for storing various data such as dial data corresponding to speed dial numbers;
h is an interface circuit (hereinafter referred to as
I/F) and 51 are CPUs (central processing units) that control each element constituting the NCU 5.

The telephone I/F 5f includes a DC connection circuit, an incoming call detection circuit (not shown) that detects a 16Hz ringing signal output from the exchange, and a multifrequency signal that generates a tone signal (push button signal) corresponding to dial data. A generator (not shown) is provided.

FIG. 4 illustrates the operation panel 7. As shown in FIG. In the figure, 7a is a line selection key for selecting a digital line network or a telephone line network as a transmission line;
Reference numeral b denotes a lamp that lights up to indicate when a digital line network has been selected by the line selection key 7a. 7c is a transmission start key, 7d is a linear density changeover switch, 7e is a power switch, and 7f is a display device for making various displays.

When transmitting an image signal using the telephone line network with the above configuration, the operator sets the transmission document on the scanner 1 without operating the line selection key 7a, then calls the other station and presses the transmission start key 7e. Press . As a result, the SCU 6 outputs a subscriber network closure instruction signal to the NCU 5 via the system bus line B, which causes the CPU 5i of the NCU 5 to
Activate F5f to close the DC path with the telephone line,
Send that information back to SCU6.

Thereafter, the SCU 6 causes the CCU 4 to execute a transmission control procedure for the telephone line, and operates the scanner 1 based on the response signal from the CCU 4.

During this time, the transmission control signal D ₂₁ outputted by the CCU 4 and the signal SD obtained by encoding the output data of the scanner 1 with the DCR 3 are applied to the DSP 5d via the interface circuit 5a and internal bus line 5c of the NCU 5, and are subjected to FSK modulation. Furthermore, the signal converter 5
Telephone I/F 5 after being converted to an analog signal by e
f to the telephone line network and received by the other party's station. Furthermore, the transmission control data returned from the other station is sent to the signal converter 5e via the telephone I/F 5f.
is added to and converted into a digital signal, and furthermore,
The DSP 5d performs FSK demodulation and converts it into a transmission control signal _D22 , which is sent to the CCU 4 via the internal bus line 5 and interface circuit 5a.

Note that the SCU 6 can also output a calling command to the NCU 5 by the operator inputting the speed dial number of the other station using, for example, a numeric keypad (not shown). In this case SCU6
sends the speed dial number data following the calling command.
Outputs to NCU5, thereby causing CPU5 of NCU5
After closing the DC path through the telephone I/F 5f, i reads dial data corresponding to the short dial number data from the data memory 5g and applies it to the multi-frequency signal generator of the telephone I/F 5f. As a result, a PB signal corresponding to the dial data is output, and the other station is called.

In addition, among the modulation and demodulation functions of DSP5d, the functions of scrambler, descrambler, decoder, and encoder, which are simply combinations of logical operations, are
The CPU 5i may be made to perform the processing.

When a call is made from another station connected to the telephone line network, a 16 Hz ringing signal output from the exchange is detected by the incoming call detection circuit of the telephone I/F 5f, and its output is output to the CPU 5i. The CPU 5i closes the DC path via the telephone I/F 5f and transmits a signal indicating that a call has been made to the internal bus line 5c.
It is output to the SCU 6 via the interface circuit 5b and the system bus line B.

As a result, the SCU 6 activates the CCU 4 to execute the transmission control procedure between the calling stations, and also causes the DCR 3 to decode the received image signal RD transmitted from the other station and output it to the printer 2. to output the received image.

When transmitting image information using a digital line network, the operator presses the line selection key 7a to select the digital line network, sets the original to be transmitted on the scanner 1, and then presses the transmission start key 7c. As a result, SCU6 receives the digital line network establishment signal.
Output to NCU5, CPU5i of NCU5 is X21
Activate the I/F5h and connect each terminal T, C, I, and R of this X21I/F5h according to the prescribed procedure (X
21) to establish a line with the digital line network, and then sends a line establishment signal to the SCU 6.

The SCU 6 operates the CCU 4 to execute a transmission procedure for the digital line network, and operates the scanner 1 accordingly. During this time, the transmission data D ₁₁ output from the CCU 4 is sent to the other station via the interface circuit 5a, internal bus line 5b, and terminal T of the X21I/F5h, and the response data _D12 from the other station is sent to the X21I/F5h. terminal R,
It is sent to the CCU 4 via the internal bus line 5b and the interface circuit 5a.

In this way, image information is transmitted through the digital line network.

When receiving image information from a station connected to the digital line network, first
When the CPU 5i detects an incoming call, it notifies the SCU 6 that the call has been made, and also sends an
A line is established by controlling each terminal T, C, I, and R of h according to a predetermined procedure, and when the line is established, the SCU 6 is notified of this fact.

Thereafter, the SCU 6 operates the CCU 4 to execute a predetermined transmission procedure, and accordingly operates the printer 2 to output the image signal output from the DCR 3 to the printer 2 to form a received image.

In this way, image information is transmitted through the telephone line network and the digital line network.

Furthermore, in the embodiment described above, a DSP is provided in the NCU and modulation/demodulation is performed by this DSP, so there is no need to provide a special modem (modulator/demodulator) required for data transmission using an analog line network. , which is advantageous in terms of cost.

〔effect〕

As described above, the present invention has the effect of realizing a facsimile device that can be applied to both analog line networks and digital line networks.

[Brief explanation of the drawing]

FIG. 1 is a block diagram schematically showing an embodiment of the present invention, and FIG. 2 shows a DCR, CCU, and NCU.
Transmission signals between each other (including transmission control signals)
The block diagram shown in Fig. 3 shows the mode of sending and receiving.
FIG. 4, a block diagram showing the detailed configuration of the NCU, is a front view showing the operation panel. 4...CCU, 5...NCU, 5d...DSP, 5e...signal converter, 5f...telephone I/F, 5h...X21I/
F, 5i...CPU.

Claims (1)

[Claims] 1. Network control means for connecting to an analog line network and a digital line network and exchanging data;
The network control means includes an analog line interface means for connecting to the analog line network, and the digital line network. digital line interface means for connecting to a network; and when a call is received from the analog line network, the analog line interface means controls the connection of the line; A facsimile apparatus, sometimes comprising a control means for controlling line establishment by the digital line interface means.