JP3459709B2 - Facsimile machine - 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 machine capable of sending training.

[0002]

2. Description of the Related Art Conventionally, in the ITU-T recommendation G3 facsimile apparatus, as shown in FIG. 2, a training signal is transmitted immediately before a training check signal and immediately before an image signal. Then, the ITU-T Recommendation V. 29,
V. In the 27ter-based facsimile apparatus, the training signal immediately before the training check signal and the training signal immediately before the image signal are the same and are transmitted for the same time.

Also, ITU-T Recommendation V. In the facsimile machine based on 17, the training signal immediately before the training check signal is longer than the training signal immediately before the image signal, but the training transmission time is a fixed value. That is, if the transmission speed is the same, the training signal time does not change regardless of the line quality and the communication partner, and is a fixed time.

[0004]

However, V.I. Three
Considering a facsimile machine that performs four operations, the receiver side IN before the long training is received.
The training time transmitted by the calling modem is set by bits 15 to 21 of the FOh signal. That is, INF
The 15 to 21 bits of the Oh signal represent an integer from 0 to 127, and the time obtained by multiplying this value by 35 ms is the training time. An example of this specific protocol is shown in FIG.

In FIG. 3, first, a signal (ANSam (2100 Hz is set to 15
Signal modulated in Hz))). From the calling side, V.
A CM signal by 8 modulation is sent out, and the receiver is notified of a transmission mode that can be transmitted during image transmission.

After receiving the CM signal, the callee side notifies the transmitter of the transmittable transmission mode that can be received by the callee side among the transmittable modes designated by the CM signal. The calling party is JM
After receiving the signal, the CJ signal is transmitted to notify the receiver of the transmission mode.

The transmitter sends a line probing signal for checking the condition of the telephone line 50 ms after the CJ signal is sent, and the receiver outputs a signal (in this case, an INFOh signal is output) in response to this signal. Is transmitted, and the subsequent transmission level, amplitude level correction, and transmission baud rate are notified to the transmitter.

The transmitter sends a long training signal 50 ms after the line probing signal is sent, and the receiver adjusts the equalizer of the modem and detects the timing based on this signal.

The transmitter sends a parameter exchange signal 50 ms after the long training signal has been sent, and the receiver sends a signal in response to this signal to notify the transmitter of subsequent link correction and bit rate. To do. Next, the receiver follows the parameter exchange response signal with CSI and DI.
The S signal is transmitted, the flag is transmitted until the TSI and DCS signals are received, and the CFR signal is transmitted after the TSI and DCS signals are received.

After the transmitter receives the CSI and DIS signals,
TSI and DCS signals are transmitted, and flags are transmitted until CFR is received. Next, the transmitter, after sending the flag signal,
An image signal is transmitted after 50 ms has elapsed, and a PPS-MPS signal is transmitted 50 ms after the completion of image signal transmission, and the MC
The flag is transmitted until the F signal is received. The receiver is P
After receiving the PS-MPS signal, the MCF signal is transmitted.

The transmitter transmits the image signal 50 ms after the flag signal is transmitted, transmits the PPS-EOP signal 50 ms after the completion of the image signal transmission, and transmits the flag until the MCF signal is received. The receiver is PPS-EOP
After receiving the signal, the MCF signal is transmitted.

In the above protocol, at present, the transmission time of the long training signal by the INFOh signal is judged by the modem on the receiver side and is notified to the modem on the transmitter side. Is not under the control of.

For this reason, conventionally, there has been a drawback that no measures are taken even if the reception from a specific destination fails and the cause is a short training transmission time.

It is an object of the present invention to provide a facsimile machine capable of performing proper training according to a terminal.

[0015]

The present invention is based on the ITU-T proposal.
Notice V. In a facsimile machine that performs operations based on 34
Identify the sending terminal before receiving long training.
Corresponding identification means and long train
The setting means for setting the execution time of
Set in the above setting means according to the identified sending terminal
Send long training according to the time being
To notify the transmitter so that
It is a facsimile machine to collect.

[0016]

[0017]

[0018]

[0019]

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the structure of a facsimile apparatus according to an embodiment of the present invention.

The NCU (network control unit) 2 is connected to the terminal of the line in order to use the telephone network for data communication and the like,
It controls the connection of the telephone exchange network, switches to the data communication path, and holds the loop. If the signal level (signal line 20a) from the control circuit 20 is "0", the NCU 2 connects the telephone line 2a to the signal line 2
If the signal level is "1", the telephone line 2a is connected to the signal line 2c, that is, the facsimile machine side. In the normal state, the telephone line 2a is connected to the signal line 2b side.

The hybrid circuit 6 separates the transmission system signal and the reception system signal, sends the transmission signal from the addition circuit 12 to the telephone line 2a via the NCU 2, and receives the signal from the partner side via the NCU 2. The signal is sent to the modulator / demodulator 8 via the signal line 6a.

The modulator / demodulator 8 complies with ITU-T Recommendation V.6. 8,
V. 21, V.I. 27 ter, V.I. 29, V.I. 17, V.I.
It is a modulator / demodulator that performs modulation and demodulation based on 34, and each transmission mode is designated by the signal line 20c. Here, the long training execution time itself notified by the INFOh signal to the transmitter side or the minimum value of the long training execution time notified to the transmitter by the INFOh signal (depending on the reception result of the line proving signal by the modulator / demodulator itself). If the execution time of the determined long training is longer than the time notified via the signal line 20c, it is permitted, and if it is shorter, it is not permitted) is set in the modem 8.

The modulator / demodulator 8 inputs the signal output to the signal line 20b and outputs the modulated data to the signal line 8a.
The received signal output to the signal line 6a is input, and demodulated data is output to the signal line 8b.

The ANSam transmission circuit 10 is a circuit for transmitting an ANSam signal. When the signal of the signal level "1" is output to the signal line 20d, the ANSam signal is transmitted to the signal line 10a and is transmitted to the signal line 20d. When the signal of the signal level "0" is being output, no signal is output to the signal line 10a.

The adder circuit 12 receives the information of the signal line 8 a of the information and the signal line 10a, signal line 12a a result of addition
Output to.

The reading circuit 14 outputs the read data to the signal line 14a. In addition, the recording circuit 16 uses the signal line 20.
The information output to e is sequentially recorded line by line.

The memory circuit 18 is used to store raw information of read data and encoded information, and to store received information and decoded information.

The switch circuit 21 connects the signal line 2b to the signal line 4b (telephone side) and outputs the signal level "1" to the signal line 20f when the signal of the signal level "0" is output to the signal line 20f. When the signal is output, the signal line 2b is connected to the signal line 4a.

The call signal detection circuit 22 outputs a signal of signal level "1" to the signal line 22a when the call signal is detected on the signal line 4b, and outputs a signal to the signal line 22a when the call signal is not detected. The signal of level "0" is output.

The telephone number detection circuit 24 is a circuit for detecting the telephone number between calling signals, and inputs the information output to the signal line 4b and outputs the telephone number information output between the calling signals to the signal line 24a. Output to.

The operation unit 26 includes circuits 28 and 30.
Registration key, numeric keypad, one-touch dial, speed dial, start key, and other function keys, and pressed key information is output to the signal line 26a.

The execution time registration circuit 28 specifies the long training execution time on the facsimile transmitter side with the INFOh signal when the facsimile device is in the receiving state.
This circuit registers this time via the signal line 28a.

Since the execution time registration circuit 30 designates the long training execution time of the partner facsimile transmitter side by the INFOh signal when this facsimile device is in the receiving state, this time corresponds to the transmitting terminal via the signal line 30a. It is a circuit that registers the long training execution time.

The selection circuit 32 directly notifies the facsimile transmitter side of the long training execution time set by the registration circuit 28 or the registration circuit 30, or the registration circuit 2
8 or the long training execution time set by the registration circuit 30 is set to the minimum value, and when the modem itself determines that it is necessary to execute training longer than this time, the circuit for selecting whether to notify the facsimile transmitter side of the time. Yes, when the former is selected, a signal of signal level “0” is output to the signal line 32a, and when the latter is selected, a signal of signal level “1” is output to the signal line 32a.

The memory circuit 34 sets the long training execution time corresponding to the transmission terminal and the error condition at the time of starting reception of the primary channel (image information) at that time by the signal line 3.
It is a circuit for storing via 4a.

The control circuit 20 controls the entire facsimile apparatus according to the present embodiment, and particularly the V. Three
The following operations are controlled in the facsimile apparatus which performs four operations.

First, by setting the execution time of the long training, the transmitter is notified by the INFOh signal so that the long training signal is transmitted for the set time.

Here, if it is selected to set the execution time of long training regardless of the reception result of line probing, the fixed time is notified to the transmitter, and if not selected, the modulator / demodulator 8 itself. Based on the reception result of line probing, determine the sending time of the long training signal, and only when this time is shorter than the set time,
The transmitter is notified of the set time (that is, the minimum value of the execution time of long training is set, and the modulator / demodulator 8 is allowed to set it longer than this time).

4 and 5 are flow charts showing the control of the control circuit 20 in the first embodiment of the present invention. Note that the circuit 21 is not used, and the signal line 2b is always the signal line 4
It is assumed that the circuit is connected to the b (telephone) side, and the designation of the execution time of the long training to the transmitter side is not changed corresponding to the transmission terminal. Therefore, the circuits 22, 24,
30 and 34 are not used.

In FIG. 4, in S42, a signal of signal level "1" is output to the signal line 20f so that the switch of the unused switch circuit 21 is connected to the signal line 2b and the signal line 4a.

In S44, a signal of signal level "0" is output to the signal line 20a to turn off the CML. Also, S4
6, the signal of the signal level "0" is output to the signal line 20d and the ANSam signal is not transmitted.

In S48, it is determined whether or not an incoming call is detected. If an incoming call is detected, the process proceeds to S56. If no incoming call is detected, the process proceeds to S50, and other processing is performed.

In S52, when the information of the signal line 26a is input and the registration of the long training execution time is selected, the process proceeds to S54, and the execution time of the long training signal is registered in the circuit 28 (an integer of 35 m (0 to 127). ), And if not selected, the process proceeds to S42.

In S56, the signal of the signal level "1" is output to the signal line 20a to turn on the CML. Next, S5
8 outputs the ANSam signal with the signal level of the signal line 20d set to "1" for a predetermined time. Here, the ANSam signal is a modified response tone signal, which is amplitude-modulated 2100 Hz.
Cosine signal of V. It is one of eight signals.

At S60, the CM signal is received. Here, the CM signal is a calling menu signal, which is a signal transmitted from the calling terminal, and is mainly used to display the modulation schemes available in the calling terminal. The CM signal is also V. It is one of eight signals.

In S62, the JM signal is transmitted. Here, the JM signal is a common menu signal, which is a signal transmitted from the answering terminal, and is mainly used to indicate a modulation scheme commonly available to the calling and answering terminals. The JM signal is also V. It is one of eight signals.

At S64, the CJ signal is received. Here, the CJ signal is a CM terminator, and is a signal indicating confirmation that the JM signal is detected and the end of the CM signal. The CJ signal is also V. It is one of eight signals.

In S66, INFO _c , B, B _* , L
1, (shown Here, the subscript * is a negative logic signal) and reception of the _{L2, B, INFOO a, A} , A *, and transmits the A.
These are V. 34 signals, the INFO sequence is used to exchange modem capabilities, line probing results, and data mode modulation parameters. Tone B is a 1200 Hz tone transmitted by the calling modem. The transition from B to B _* or B _* to B is 1200 Hz at 18
The phase is inverted by 0 degrees. Tone A is a 2400 Hz tone transmitted by the answer modem. A to A
The transition from _* or A _* to A is 180 at 2400 Hz.
The phase is inverted once. Further, the two line probing signals L1 and L2 are used to analyze channel characteristics.

In S68, it is judged whether or not the transmission timing of INFOh has come, and when the transmission timing comes, S7
If it is not the transmission timing, the process proceeds to S66.

In S70, the signal line 32a is input, and it is judged whether or not the setting of the long training execution time is only the minimum value, and only the minimum value is set (the modulator / demodulator itself is longer than this time). In the case of (determination is permitted), the process proceeds to S72, and the time of the circuit 28 is designated as the minimum value of the execution time of the long training to the modulator / demodulator 8 via the signal line 20c. After this, the process proceeds to S76.

If the minimum value is not set (the time determined by the modulator / demodulator itself is ignored), the process proceeds to S74.
The time of the circuit 28 is designated as the execution time of the long training to the modulator / demodulator 8 via the signal line 20c. After this, the process proceeds to S76.

In S76, the INFOh signal is transmitted. The INFOh signal is a TRN sent by the calling modem.
The length of (long training) is an integer from 0 to 127, and the length of the sequence is expressed by the number of 35 mm units, and is specified by bits 15 to 21. Further, the pre-emphasis filter of the transmission modulator / demodulator, the symbol speed are specified. Etc. are specified.

Then, in S78, the long training signal is received, in S80, parameter exchange is performed by the MPh signal, the data transmission rate is determined, and the pre-procedure is also executed.

In S82, the primary channel, that is, the image signal is received, and in S84, the post-procedure is performed.

Next, a second embodiment of the present invention will be described.

In the second embodiment, the control circuit 20
Prior to receiving the long training, the terminal identifies the terminal on the transmitter side based on the transmission terminal information sent between the calling signals, and sets the execution time of the long training corresponding to this transmission terminal. Then, INFOh notifies the transmitter to send long training for a set time corresponding to the identified sending terminal.

Here, if it is selected to set the execution time of the long training regardless of the reception result of the line probing, the transmitter is notified of the time registered corresponding to the transmission terminal and the selection is made. If not, the modulator / demodulator itself determines the sending time of the long training signal based on the reception result of the line probing, and sets the set time only when this time is shorter than the set time registered for the sending terminal. Notify the transmitter. That is, the minimum value of the execution time of the long training registered corresponding to the transmitting terminal is set, and the modulator / demodulator is allowed to set it longer than this time.

FIGS. 6 and 7 are flow charts showing a part of the operation of the control circuit 20 in the second embodiment which is different from that in the first embodiment (FIGS. 4 and 5). Here, the circuit 28 is not used.

In FIG. 6, S90 represents S40. Then, in S92, the signal of the signal level "0" is output to the signal line 20f, and the signal line 2b is connected to the signal line 4b. Then, in S94, the process proceeds to S44. In the second embodiment, the detection of the incoming signal in S48 is performed by inputting the information on the signal line 22a.

Next, S96 represents S50.
Then, in S98, when the information of the signal line 26a is input and the registration of the execution time of the long training corresponding to the transmission terminal is selected, the process proceeds to S100, and the execution time of the long training corresponding to the transmission terminal is set to 35 ms in the circuit 30. Is registered as an integral multiple (0 to 127) times of S102 (S42)
Proceed to. If not selected, S102 (S42)
Proceed to.

Further, S104 represents YES in S70. Then, in S106, the time corresponding to the transmission terminal and registered in the circuit 30 is designated as the minimum value of the execution time of the long training to the modulator / demodulator 8 via the signal line 20c. After that, in S108, the process proceeds to S76.

Further, S110 represents NO in S70. Then, in S112, the time registered in the circuit 30 is designated as the execution time of the long training to the modulator / demodulator 8 via the signal line 20c, corresponding to the transmission terminal. After that, in S108, the process proceeds to S76.

Next, S114 represents YES in S48. Then, in S116, the information of the signal line 24a is input and the telephone number transmitted between the calling signals is stored as the transmitting terminal. After that, in S118, the process proceeds to S56.

Next, a third embodiment of the present invention will be described.

In the third embodiment, the execution time of long training is registered corresponding to the transmitting terminal in the second embodiment, and the execution time of this long training is changed based on the past communication history. It was done like this.

Corresponding to the transmitting terminal, when the image signal is received, the equalizer cannot be adjusted, and the image signal cannot be received, the time registered in the circuit 30 has been changed twice in the past. 35 m
s Make it longer.

FIG. 8 is a flow chart showing a part of the operation of the control circuit 20 in the third embodiment which is different from that in the second embodiment (FIGS. 4 to 7).

First, S120 represents the above S40. Then, in S122, the presence or absence of the equalizer error at the beginning when the image signal is received one time before is set to none in correspondence with all the transmission terminals in S122. Here, the equalizer error at the head when receiving the image signal is determined to be short in the long training transmission time. And S1
At 24, the process proceeds to S92.

Further, S126 represents the above S82. Then, in S128, it is determined whether or not there is an equalizer error at the beginning of the reception of the image signal. If there is, the process proceeds to S132, and if not, the process proceeds to S130 (S84).

At S132, 1 is received by receiving from the same destination.
It is determined whether or not there is an equalizer error at the beginning of the reception of the image signal even before the previous time, and if there is, the process proceeds to S134, in which the execution time of the long training corresponding to the transmission terminal received this time is added by 35 ms and registered. Then, in S136, corresponding to the transmitting terminal, it is registered that there is no equalizer error at the beginning when the image signal is received one time before. Then, in S138, the process proceeds to S84.

If there is no equalizer error, the process proceeds to S140, and registers that there is an equalizer error at the beginning of the previous reception of the image signal corresponding to the transmitting terminal. Next, in S142, the process proceeds to S84.

[0073]

According to the present invention, a transmitter terminal can be used and
Under the control of the main CPU
Can be set to each destination and the line characteristics are different.
Therefore, there is an effect that a reliable receiving operation becomes possible.

[0074]

[0075]

[0076]

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of a protocol in a conventional facsimile apparatus.

FIG. 3 is a diagram illustrating a V.V. in a conventional facsimile apparatus. It is an explanatory view showing an example of the 34 protocol.

FIG. 4 is a flowchart showing an operation in the first embodiment of the present invention.

FIG. 5 is a flowchart showing an operation in the first embodiment.

FIG. 6 is a flowchart showing an operation in the second embodiment of the present invention.

FIG. 7 is a flowchart showing an operation in the second embodiment.

FIG. 8 is a flowchart showing an operation in the third embodiment of the present invention.

[Explanation of symbols]

2 ... NCU, 4 ... phone, 6 ... hybrid circuit, 8 ... Modem, 10 ... ANSam sending circuit, 12 ... Adder circuit, 14 ... reading circuit, 16 ... Recording circuit, 18 ... Memory circuit, 20 ... Control circuit, 21 ... switch circuit, 22 ... Call signal detection circuit, 24 ... Telephone number detection circuit, 26 ... Operation Department, 28, 30 ... Execution time registration circuit, 32 ... Selection circuit, 34 ... Memory circuit.

Claims (3)

(57) [Claims] 1. ITU-T Recommendation V. In the facsimile apparatus which operates based on 34, the identification means for identifying the transmitting terminal prior to the reception of the long training, the setting means for setting the execution time of the long training corresponding to the transmitting terminal, and the identification means are used for the identification. A facsimile device, comprising: a notification unit that notifies a transmitter to transmit long training corresponding to a time set in the setting unit, corresponding to a transmission terminal. 2. The facsimile apparatus according to claim 1, wherein the identifying means identifies the terminal on the transmitter side based on the transmitting terminal information sent during the calling signal. 3. The setting means according to claim 1, wherein the execution time of the long training is registered corresponding to the transmitting terminal, and the execution time of the long training is changed based on the past communication history. Characteristic facsimile machine.