JP3135445B2 - 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 apparatus, and more particularly to a facsimile apparatus in which half-duplex communication and full-duplex communication can be selected as communication modes.

[0002]

2. Description of the Related Art Generally, a transmission system includes a full-duplex communication system in which communication can be performed independently and simultaneously in two directions on a communication line, and a half-duplex communication system in which communication can be performed in only one direction at the same time. There is a duplex communication method.

Conventionally, some facsimile apparatuses are set so that a half-duplex communication system and a full-duplex communication system can be selected as a transmission system. In this facsimile apparatus, the signal transmission level during half-duplex communication and the signal transmission level during full-duplex communication are set to be the same.

[0004]

However, when the signal transmission level is determined from the half-duplex communication system, the signal transmission level in the full-duplex communication system becomes too high. On the other hand, if the signal transmission level is determined according to the full-duplex communication method, the signal transmission level in the half-duplex communication method becomes too low. As a result, when a call connection with a large loss in the communication line is performed, a communication error may occur.

An object of the present invention is to set an appropriate transmission level for each of a half-duplex communication system and a full-duplex communication system, thereby preventing a communication error from occurring and performing a good communication. Is to provide.

[0006]

According to the first aspect of the present invention,
In the facsimile apparatus and the half-duplex communication and full-duplex communication is set to be selected as a communication mode, wherein
Communication that can selectively execute half-duplex communication and the full-duplex communication
And signal means, and characterized by having a transmission level setting means for <br/> set individually and transmission level of the transmission level and the full-duplex communication when the signal of the signal of the half-duplex communication by said communication means I do.

[0007] The invention according to claim 2 is a method according to claim 1.
In the facsimile apparatus, the transmission level setting means includes:
The transmission level of the signal at the time of half-duplex communication by the communication means,
Set the signal transmission level during full-duplex communication to a different level.
Is set to the default.

According to a third aspect of the present invention, in the facsimile apparatus according to the second aspect , the transmission level setting means includes:
The signal transmission level at the time of half-duplex communication by the communication means
It is characterized in that it is set to a level higher than a signal transmission level at the time of full-duplex communication by the communication means .

[0009] The invention of claim 4, wherein the claim 1 to請
4. The facsimile apparatus according to claim 1 , wherein a signal transmission level during half-duplex communication and a signal transmission during full-duplex communication by the communication unit within a preset range.
Registration means for registering a level , wherein the communication means
Ri, before the determination of the communication mode performs signal transmission in the signal transmission level during full duplex communication is the registration, when the said after signaling full duplex communication is selected, is the registration
Continued signal delivered at the signal transmission level full-duplex communication are, when the half-duplex communication is selected, is the registration
And performing signal transmission in the signal transmission level during that half-duplex communication.

According to a fifth aspect of the present invention, in the facsimile apparatus according to any one of the first to fourth aspects, one of half-duplex communication and full-duplex communication is provided for each destination. A communication mode is registered, and a signal transmission level is determined at the time of a communication operation based on the registered communication mode. According to a sixth aspect of the present invention, in the facsimile apparatus according to any one of the first to fifth aspects, the communication mode includes half-duplex communication, full-duplex communication in which image transmission is unidirectional, and image transmission. Two-way full-duplex communication can be set, and the signal transmission level is changed according to each communication mode.

[0011]

According to the first aspect of the present invention, the transmission level setting means individually sets the signal transmission level for half-duplex communication and the signal transmission level for full-duplex communication by the communication means .
Therefore, an appropriate transmission level is set for each of the half-duplex communication method and the full-duplex communication method, thereby preventing a communication error from occurring and performing good communication.

According to the second aspect of the present invention, the transmission level is set.
Means for transmitting signals during half-duplex communication by the communication means.
And the signal transmission level during full-duplex communication are different from each other
Can be set to level.

According to the third aspect of the present invention, the transmission level setting means sets the transmission level of the signal during half-duplex communication to a higher level than the transmission level of the signal during full-duplex communication. Therefore, the possibility of occurrence of a communication error in half-duplex communication can be reduced.

[0014] In the present invention of claim 4, wherein, to register a signal transmission level and full-duplex signal transmission level when communicating half-duplex communications within a preset range by registration means, the communication means
Therefore, before the determination of the communication mode, the signal is transmitted at the registered signal transmission level for full-duplex communication, and if full-duplex communication is selected after this signal transmission, the registered full-duplex communication is performed. When the half-duplex communication is selected, the signal is transmitted at the registered signal transmission level for the half-duplex communication. Therefore, it is possible to appropriately switch the transmission level after discriminating between full-duplex communication and half-duplex communication.

According to the fifth aspect of the present invention, one of the half-duplex communication and the full-duplex communication mode is registered for each destination, and a signal is transmitted based on the registered communication mode during a communication operation. Is determined. Therefore, it is possible to determine whether the communication mode is full-duplex communication or half-duplex communication according to the other party, and to control the transmission level appropriately. According to the sixth aspect of the invention, the communication mode can be set to half-duplex communication, one-way full-duplex communication for image transmission, and two-way full-duplex communication for image transmission. Change the signal transmission level. Therefore, appropriate switching can be performed between half-duplex communication, full-duplex communication in which image transmission is one-way, and full-duplex communication in which image transmission is two-way.

[0016]

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

(First Embodiment) FIG. 1 is a block diagram showing the configuration of a first embodiment of the facsimile apparatus of the present invention.

As shown in FIG. 1, the facsimile apparatus of this embodiment includes a network control unit (hereinafter, referred to as NCU) 2 connected to a telephone line 2a.

In order to use the telephone network for data communication and the like, the NCU 2 connects a terminal to the line, controls connection of a telephone switching network, switches to a data communication path, holds a loop, and performs other operations. Connection between 2a and telephone 4,
And, the connection between the telephone line 2a and the hybrid circuit 6 is selectively switched. NCU 2 and telephone 4 are connected to signal line 2b
, And the NCU 2 and the hybrid circuit 6 are connected by a signal line 2c. The switching operation of the NCU 2 is controlled by a control signal output from a control circuit 48 to be described later via a signal line 48a. When the level of the control signal is "0", the connection between the telephone line 2a and the telephone 4 is established. On the other hand, when the level of the control signal is “1”, the connection between the telephone line 2 a and the hybrid circuit 6 is performed.

The hybrid circuit 6 includes a transmission signal transmitted from the transmission system transmitted via the telephone line 2a and a telephone line 2a.
, And a reception signal to a reception system received via

The transmission system has a V21 modulator 8, a backward channel signal detection circuit 20, and a reading circuit 12 composed of an image pickup device such as a CCD and an optical system.

The V21 modulator 8 is a modulator that performs a modulation process based on CCITT (International Telegraph and Telephone Consultative Committee) recommendation V21. The V21 modulator 8 performs a modulation process on the procedure signal output from the control circuit 48 via the signal line 48b, and converts the modulated signal to a signal level 8a at a transmission level of 0 dBm.
Is output to the gain adjustment circuit 10 via.

The gain adjustment circuit 10 attenuates the modulated signal from the V21 modulator 8 in accordance with the amount of attenuation indicated by the signal output from the control circuit 48 via the signal line 48f. The signal is supplied to the addition circuit 28 via 10a.

Backward channel signal detection circuit 20
Transmits an FSK signal that has been subjected to frequency shift keying processing in a band other than the band specified in Recommendation V27ter or V29. The backward channel signal detection circuit 20 performs a frequency shift keying process on the signal output from the control circuit 48 via the signal line 48d, and generates a signal subjected to the frequency shift keying process.

The signal from backward channel signal detection circuit 20 is applied to gain adjustment circuit 22. The gain adjustment circuit 22 attenuates the signal from the backward channel signal detection circuit 20 in accordance with the amount of attenuation indicated by the signal output from the control circuit 48 via the signal line 48h, and the attenuated signal is applied to the signal line 10a. To the addition circuit 28 via

The reading circuit 12 comprises an image pickup device such as a CCD and an optical system. The reading circuit 12 sequentially reads one line of image in the main scanning direction from the transmission document, and generates a white and black binary signal corresponding to the read image. The operation of the reading circuit 12 is controlled based on a control signal output from the control circuit 48 via a signal line 48c. When this control signal indicates “1”, the reading circuit 1
2 is permitted, and when this control signal indicates "0", the operation of the reading circuit 12 is not permitted. Read circuit 12
From the encoding circuit 1 via the signal line 12a.
4 given.

The encoding circuit 14 encodes the binary signal input from the reading circuit 12, and outputs the encoded signal via a signal line 14a. As this encoding,
Modified Huffman coding (MH coding) or Modified read coding (MR coding) is used. The output operation of the encoding circuit 16 is controlled based on a control signal output from the control circuit 48 via a signal line 48j. When this control signal indicates “0”, the encoding circuit 1
4 from the V2 via signal line 14a.
When the control signal indicates “1”, the coded signal from the coding circuit 14 is provided to the modulator 24 via the signal line 14b.

The V27ter modulator 16 performs a modulation process on the encoded signal to generate a modulated signal. In this modulation process, differential phase modulation based on CCIT recommendation V27ter is used. Alternatively, quadrature modulation based on recommendation V29 can be used.

The modulation signal from the V27ter modulator 16 is supplied to a gain adjustment circuit 18 via a signal line 16a, and the transmission level of the modulation signal is 0 dBm. The gain adjustment circuit 18 controls the V27ter modulator 1 in accordance with the amount of attenuation indicated by the signal output from the control circuit 48 via the signal line 48g.
6 is attenuated, and the attenuated signal is supplied to the addition circuit 28 via the signal line 18a.

The modulator 24 modulates the encoded signal from the encoding circuit 14 and the procedure signal output from the control circuit 48 via the signal line 48e, and generates each modulated signal in a different band. I do. Therefore, full-duplex communication is possible. The modulated coded signal and the modulated procedural signal are each transmitted on signal line 2 at a transmission level of 0 dBm.
4a to the gain adjustment circuit 26.

The gain adjusting circuit 26 attenuates the modulated signal from the modulator 24 in accordance with the amount of attenuation indicated by the signal output from the control circuit 48 via the signal line 48i, and the attenuated signal is applied to the signal line 26a. To the addition circuit 28 via

The addition circuit 28 adds the signal from the gain adjustment circuit 10, the signal from the gain adjustment circuit 22 and the signal from the gain adjustment circuit 26, and uses the added signal as a transmission signal via the signal line 28a. Hybrid circuit 6
Output to

On the other hand, the receiving system is a V21 demodulator 30
, A V27ter demodulator 32, a backward channel signal detection circuit 38, and a demodulator 40.

The V21 demodulator 30 complies with CCIT Recommendation V21.
, A demodulation process is performed on the received signal output from the hybrid circuit 6 via the signal line 6a to generate a procedure signal. This procedure signal is supplied to the control circuit 48 via the signal line 30a.

The V27ter demodulator 32 performs a demodulation process on the received signal output from the hybrid circuit 6 via the signal line 6a to generate a demodulated signal. In this demodulation process, a demodulation process based on CCIT recommendation V27ter is used, but a demodulation process based on recommendation V29 can be used instead. The demodulated signal from the V27ter demodulator 32 is supplied to a decoding circuit 34 via a signal line 32a.

Backward channel signal detection circuit 38
Is a circuit for detecting a signal transmitted on the backward channel. That is, the backward channel signal detection circuit 38 extracts the FSK signal from the received signal output from the hybrid circuit 6 via the signal line 6a, and
Generate a demodulated signal for the K signal. This demodulated signal is provided to the control circuit 48 via the signal line 38a.

The demodulator 40 extracts an image signal and a procedure signal from the received signal output from the hybrid circuit 6 via the signal line 6a, and demodulates these signals. Note that the band used by the image signal and the band used by the procedure signal are different from each other, and full-duplex communication is possible. The demodulated image signal is supplied to a decoding circuit 34 via a signal line 40a, and the demodulated procedure signal is supplied to a control circuit 48 via a signal line 40b.

The decoding circuit 34 decodes the signal from the V27ter demodulator 32 when the signal of level "0" is output from the control circuit 48 via the signal line 48k.
When the signal of level “1” is output from the control circuit 48 via the signal line 48k, the signal from the demodulator 40 is decoded. This decoding includes MH (Modified Huffman) decoding or MR (Modified Read)
Decryption is used. The decoded data is provided to the recording circuit 36 via the signal line 34a.

The recording circuit 36 sequentially records the decoded data from the decoding circuit 34 on a recording sheet line by line.

The control circuit 48 controls switching between half-duplex communication and full-duplex communication, and controls functions such as a one-touch dial function, a shortened dial function, and a start function.

In the switching control between half-duplex communication and full-duplex communication, information indicating whether the communication partner registered in the one-touch dial or the abbreviated dial performs half-duplex communication or full-duplex communication is registered. Then, when the communication is executed, the communication mode is determined based on the registered information, and the signal transmission level corresponding to the determined communication mode is selected. The transmission level of the signal for half-duplex communication is set to be higher than the transmission level of the signal for full-duplex communication.

To control switching between half-duplex communication and full-duplex communication, an operation unit 42, a half-duplex communication transmission level registration circuit 43, a full-duplex communication transmission level registration circuit 44,
A first destination full-duplex / half-duplex communication registration circuit 45;
And the full-duplex / half-duplex communication registration circuit 46 of the other party.

On the other hand, the operation unit 42 is used to control each function such as the one-touch dial function, the speed dial function, and the start.

The operation unit 42 includes a numeric keypad, a one-touch dial key, a speed dial key, a function key, a half-duplex communication transmission level registration button, a full-duplex communication transmission level registration button, and a half-duplex communication / registration corresponding to the other party.
It has a full-duplex communication registration button, and when each key or each button is pressed down, a signal for instructing execution of a function corresponding to the operated key or button is given to the control circuit 48 via the signal line 42a. Can be

The half-duplex communication transmission level registration circuit 43 includes:
The transmission level of the half-duplex communication is registered. When registering the half-duplex communication transmission level in the half-duplex communication transmission level registration circuit 43, the control circuit 48 outputs the half-duplex communication transmission level (for example, -8 dBm) via the signal line 43a.
After the output of this transmission level, the control circuit 48 sends the signal line 48
A write pulse is output via p. When reading the transmission level of the half-duplex communication from the half-duplex communication transmission level registration circuit 43, a read pulse is output from the control circuit 48 via the signal line 48q and registered in the control circuit 48 via the signal line 43a. The transmission level of the half-duplex communication is output.

The full-duplex communication transmission level registration circuit 44 includes:
The transmission level of full-duplex communication is registered. When registering the full-duplex communication transmission level in the full-duplex communication transmission level registration circuit 44, the control circuit 48 outputs the full-duplex communication transmission level (for example, -16 dBm) via the signal line 44a. After the output of the transmission level, a write pulse is output from the control circuit 48 via the signal line 48r. When the transmission level of full-duplex communication is read from the full-duplex communication transmission level registration circuit 44, a read pulse is output from the control circuit 48 via the signal line 48s, and the control circuit 48 receives the signal line 44a.
, The transmission level of the full-duplex communication registered via is output.

The first destination full-duplex / half-duplex communication registration circuit 45 registers whether the communication mode is half-duplex communication or full-duplex communication for each one-touch dial. For example, it is assumed that a destination is assigned to each of the 24 one-touch dials. 1st destination full duplex
When registering the communication mode corresponding to the one-touch dial in the half-duplex communication registration circuit 45, the number of the one-touch dial corresponding to the destination (for example, “03” among “01” to “24”) via the signal line 45a ), Space and information indicating half-duplex communication or full-duplex communication (for example, information indicating half-duplex communication is set to “1” and information indicating full-duplex communication is set to “0”) Are sequentially output, and after this output, a write pulse is output from the control circuit 48 via the signal line 48l. When reading the communication mode corresponding to the one-touch dial from the first destination full-duplex / half-duplex communication registration circuit 45, a read pulse is output from the control circuit 48 via the signal line 48m, and the communication corresponding to the one-touch dial is performed. Information indicating the mode is read via the signal line 45a.

The second destination full-duplex / half-duplex communication registration circuit 46 registers whether the communication mode is half-duplex communication or full-duplex communication for each speed dial. For example, assume that a destination is assigned to each of the 100 speed dials. When registering the communication mode corresponding to each speed dial in the second destination full-duplex / half-duplex communication registration circuit 46, the speed dial number ("00" to "00") corresponding to the destination via the signal line 46a. 99, for example, "00"), space and information indicating half-duplex communication or full-duplex communication (for example, information indicating half-duplex communication is "1")
, The information indicating full-duplex communication is set to “0”)
Are sequentially output, and after this output, a write pulse is output from the control circuit 48 via the signal line 48n. When reading the communication mode corresponding to the shortened dial from the second destination full-duplex / half-duplex communication registration circuit 46, a read pulse is output from the control circuit 48 via the signal line 48o, and the communication corresponding to the shortened dial is performed. The information indicating the mode is indicated by a signal line 46.
is read via a.

Next, the control operation of the control circuit 48 in the facsimile apparatus of this embodiment will be described with reference to FIGS. 2 to 6 are flow charts for explaining the control operation by the control circuit in the facsimile apparatus of FIG. 1, FIG. 7 is a view showing a half-duplex communication sequence between the facsimile apparatus of FIG. 1 and the other party, and FIG. FIG. 2 is a diagram showing a sequence of full-duplex communication between the facsimile apparatus of FIG. 1 and a destination.

Referring to FIG. 2, first, in step S52,
Is executed. In step S52, -8 dBm is registered in the half-duplex communication transmission level registration circuit 43 as the transmission level of the half-duplex communication. Next, step S54 is executed, and in step S54, -10 dBm is set as the full-duplex communication transmission level registration circuit 44 as the full-duplex communication transmission level.
Register with.

After registering the signal transmission level in each communication mode, step S56 is executed. In step S56, a control signal of level "0" is output via the signal line 48a to turn off the CML.

Next, step S58 is executed. In step S58, a "0" level signal is output via the signal line 48j, and the signal encoded by the encoding circuit 14 is V27ter modulated via the signal line 14a. To output to the device 16.

Next, step S60 is executed. In step S60, a "0" level signal is output via the signal line 48k, and the decoding circuit 34 is instructed to take in the signal from the signal line 32a.

After instructing the decoding circuit 34 to take in the signal from the signal line 32a, step S62 is executed. In step S62, it is determined whether registration of the transmission level of the half-duplex communication has been selected. When registration of the transmission level of the half-duplex communication is selected, step S64 is executed. In step S64, the transmission level of the half-duplex communication is registered in the half-duplex communication transmission level registration circuit 43. If registration of the transmission level of the half-duplex communication is not selected, step S66 is executed without executing step S64.

In step S66, as shown in FIG.
It is determined whether registration of the transmission level of the half-duplex communication has been selected. When the registration of the transmission level of the half-duplex communication is selected, step S68 is executed. In step S68, the transmission level of the full-duplex communication is registered in the full-duplex communication transmission level registration circuit 44. If registration of the transmission level of full-duplex communication is not selected, step S70 is executed without executing step S68.

In step S70, it is determined whether registration of the communication mode corresponding to the one-touch dial has been selected. When registration of the communication mode corresponding to the one-touch dial is selected, step S72 is executed. In step S72, one of the communication mode corresponding to the one-touch dial, that is, one of the half-duplex communication and the full-duplex communication is set to the first. It is registered in the destination full-duplex / half-duplex communication registration circuit 45. If registration of the communication mode corresponding to the one-touch dial is not selected, step S74 is executed without executing step S72.

In step S74, it is determined whether registration of the communication mode corresponding to the speed dial has been selected. When registration of the communication mode corresponding to the speed dial is selected, step S76 is executed, and in step S76, one of the communication mode corresponding to the speed dial, that is, one of the half-duplex communication and the full-duplex communication is set to the second. It is registered in the destination full-duplex / half-duplex communication registration circuit 46. If registration of the communication mode corresponding to the speed dial is not selected, step S78 is executed without executing step S76.

In step S78, as shown in FIG.
It is determined whether calling is selected. If calling is selected, step S82 is executed, and if calling is not selected, step S80 is executed.

In step S80, other processing is performed. In step S82, it is determined whether the outgoing call is a one-touch dial or a speed dial. If the outgoing call is a one-touch dial or abbreviated dialing, step S84 is executed. If the outgoing call is not a one-touch dial or abbreviated dialing, step S104 (shown in FIG. 6) is executed.

In step S84, it is determined whether the communication mode corresponding to the one-touch dial or the speed dial has been registered. When the communication mode corresponding to the one-touch dial or the speed dial is registered, step S86 is executed, and when the communication mode corresponding to the one-touch dial or the speed dial is not registered, step S104 is executed.

In step S86, it is determined whether the communication mode is registered as half-duplex communication. When the communication mode is registered as half-duplex communication, step S88 is executed, and when the communication mode is not registered as half-duplex communication, step S96 (shown in FIG. 5) is executed.

In step S88, the transmission level registered in the half-duplex communication transmission level registration circuit 43 is read, and when this transmission level indicates "-adBm", "a" is output.
Is output via the signal lines 48f and 48g, and the transmission levels of the procedure signal and the image signal are set to -adBm.

Next, step S90 is executed. In step S90, a call is made to the designated destination.
After the call to the designated destination, step S92 is executed. In step S92, the level “1” is set via the signal line 48a.
Is output, and the CML is turned on.

Next, step S94 is executed. In step S94, a pre-procedure, image signal transmission, and post-procedure accompanying the half-duplex communication are executed. The half-duplex communication is executed based on the sequence shown in FIG.

In step S96 executed when the communication mode is not registered as half-duplex communication, as shown in FIG. 5, full-duplex communication registered in full-duplex communication transmission level registration circuit 44 is performed. The transmission level is read, and when this transmission level indicates -bdBm, the signal lines 48f, 48
g, 48h to output the signal of “b”,
The output level of the image signal and the backward channel is -bdB
Set to m.

Next, step S98 is executed. In step S98, a call is made to the designated destination. After the call to the designated destination, step S100 is executed. In step S100, a signal of level "1" is output via the signal line 48a, and the CML is turned on.

Next, step S102 is executed. In step S102, a pre-procedure, image signal transmission, and post-procedure accompanying full-duplex communication are executed. Full-duplex communication is executed based on the sequence shown in FIG. Note that, for example, if a frame reception error occurs during transmission of an image signal, the receiving side performs control to instruct the transmitting side to execute transmission of an error frame again by a procedure signal.

After determining that the outgoing call is not a one-touch dial or speed dial (step S82) or determining that the communication mode corresponding to the one-touch dial or speed dial is not registered (step S82).
84) In step S104 executed later, as shown in FIG. 6, the transmission level of the full-duplex communication registered in the full-duplex communication registration circuit 44 is read, and the transmission level is set to-
When the signal indicates bdBm, the signal "b" is output via the signal lines 48f, 48g, and 48h, and the transmission levels of the procedure signal, the image signal, and the backward channel are set to -bdBm.

Next, step S106 is executed.
In step S106, a call is made to the designated destination. After the call to the designated destination, step S108 is executed. In step S108, a signal of level "1" is output via the signal line 48a, and the CML is turned on.

Next, step S110 is executed. In step S110, the pre-procedure, image signal transmission, and post-procedure are executed. If full-duplex communication is possible, full-duplex communication is performed. If communication is not possible, half-duplex communication is performed.

Next, a signal sequence of half-duplex communication and a signal sequence of full-duplex communication will be described with reference to FIGS.

As described above, since the signal transmission level is switched in accordance with the communication mode, the signal transmission level for each of the full-duplex communication mode and the half-duplex communication mode can be set appropriately, and a communication error can be set. The number of occurrences can be suppressed.

In this embodiment, the upper limit and the lower limit of the registered transmission level of the half-duplex communication and the registered transmission level of the full-duplex communication are not set, but the upper limit of the transmission level in each communication mode is set. And a lower limit can also be set. For example, the transmission level of half-duplex communication can be set within a range from 0 dBm to -15 dBm, and the transmission level of full-duplex communication can be set within a range of -4 dBm to -19 dBm.

The transmission level of the half-duplex communication and the transmission level of the full-duplex communication are performed in one registration, and when the transmission level of the half-duplex communication becomes higher than the transmission level of the full-duplex communication. A method of allowing registration can also be adopted.

Further, in this embodiment, the user registers whether the communication mode of the other party is half-duplex communication or full-duplex communication. However, a method of automatically performing this registration is adopted. Can do it.

(Second Embodiment) Next, a second embodiment of the facsimile apparatus of the present invention will be described with reference to FIGS. FIG. 9 and FIG. 10 are flowcharts for explaining the control operation in the second embodiment of the facsimile apparatus of the present invention.

The facsimile apparatus according to this embodiment is similar to the facsimile apparatus shown in FIG.
In this facsimile apparatus, the upper limit value and the lower limit value of the transmission level in each communication mode are set in advance, and the transmission level in each communication mode is selected within a predetermined range. The transmission level of half-duplex communication is set, for example, in the range of 0 dBm to -15 dBm, and the transmission level of full-duplex communication is set, for example, in the range of -4 dBm to -19 dBm.

Referring to FIG. 9, step S62 (FIG. 2)
), It is determined that registration of the transmission level of the half-duplex communication has been selected, and then step S122 is executed. In step S122, the registered transmission level is 0 dBm.
It is determined whether it is included in the range from to -15 dBm. The registered transmission level is 0 dBm to -1
If it is included in the range up to 5 dBm, step S
64 (shown in FIG. 2) is executed, and the designated transmission level is registered in the half-duplex communication transmission level registration circuit 43. When the registered transmission level is not included in the range from 0 dBm to -15 dBm, step S66 (shown in FIG. 3) is performed without registering the specified transmission level in the half-duplex communication transmission level registration circuit 43. Be executed.

After it is determined in step S66 (shown in FIG. 3) that registration of the transmission level of full-duplex communication has been selected,
Step S130 is performed. In step S130, the registered transmission level is changed from -4dBm to -19dB.
It is determined whether or not the value is within the range up to m. When the registered transmission level is included in the range from -4 dBm to -19 dBm, step S68 (shown in FIG. 3) is executed, and the specified transmission level is stored in the full-duplex communication transmission level registration circuit 44. be registered. If the registered transmission level is not included in the range from -4 dBm to -19 dBm, the designated transmission level is not registered in the full-duplex communication transmission level registration circuit 44, and the process proceeds to step S.
70 (shown in FIG. 3) is executed.

As described above, the transmission level in each communication mode can be properly selected, and erroneous registration can be prevented.

(Third Embodiment) Next, a third embodiment of the facsimile apparatus of the present invention will be described with reference to FIG. FIG. 11 is a flowchart for explaining a control operation in the third embodiment of the facsimile apparatus of the present invention.

The facsimile apparatus according to this embodiment is similar to the facsimile apparatus shown in FIG.
In this facsimile apparatus, the transmission level of half-duplex communication and the transmission level of full-duplex communication are performed in one registration, and the transmission level of half-duplex communication becomes full. Registration is permitted when the transmission level of the duplex communication becomes higher.

Referring to FIG. 11, after designating the input of the signal from signal line 32a to decoding circuit 34 in step S60 (shown in FIG. 2), step S142 is executed. In step S142, it is determined whether registration of the transmission level in the communication mode has been selected.

If registration of the transmission level in the communication mode is selected, step S144 is executed, and if registration of the transmission level in the communication mode is not selected, step S70 (shown in FIG. 3) is executed.

In step S144, a transmission level for half-duplex communication and a transmission level for full-duplex communication are input.

Next, step S146 is executed. In step S146, it is determined whether the transmission level of the half-duplex communication is higher than the transmission level of the full-duplex communication. When the transmission level of the half-duplex communication is higher than the transmission level of the full-duplex communication, step S148 is executed. When the transmission level of the half-duplex communication is lower than the transmission level of the full-duplex communication, step S70 is performed. Shown) is executed.

In step S148, the half-duplex communication transmission level is registered in the half-duplex communication transmission level registration circuit 43.
The transmission level of the full-duplex communication is registered in the full-duplex communication transmission level registration circuit 44.

Next, step S70 (shown in FIG. 3) is executed.

As described above, the transmission level of the half-duplex communication can be prevented from being set lower than that of the full-duplex communication, and the transmission level in each communication mode can be registered properly.

(Fourth Embodiment) Next, a fourth embodiment of the facsimile apparatus of the present invention will be described with reference to FIGS. FIGS. 12 to 14 are flowcharts for explaining a control operation in the fourth embodiment of the facsimile apparatus of the present invention.

The facsimile apparatus according to this embodiment is similar to the facsimile apparatus shown in FIG.
The facsimile apparatus of this embodiment has the same configuration as that of the facsimile apparatus shown in FIG. 1. In each of the above-described embodiments, the operator registers whether the communication mode for the destination is half-duplex communication or full-duplex communication. On the other hand, this is automatically performed, and the signal transmission level is determined based on the registered communication mode. In this automatic registration, before the communication mode is determined, a signal is transmitted at the transmission level of full-duplex communication, and when full-duplex communication is selected thereafter, signal transmission at the transmission level of full-duplex communication is performed. Continue, register that the other party is capable of full-duplex communication, and if half-duplex communication is selected, perform signal transmission at the half-duplex communication transmission level after the decision, and Register that only half-duplex communication is possible.

Referring to FIG. 12, first, at step S1
62 is executed. In step S162, registration of half-duplex communication and full-duplex communication corresponding to one-touch dialing is deleted.

Next, step S164 is executed. In step S164, registration of half-duplex communication and full-duplex communication corresponding to the shortened dial is deleted.

After deleting the communication mode registered corresponding to the one-touch dial and the speed dial, step S5
2 (shown in FIG. 2) is executed.

After it is determined in step S66 (shown in FIG. 3) that registration of the transmission level of full-duplex communication has not been selected, or in step S68 (shown in FIG. 3), the transmission level of full-duplex communication becomes full. After being registered in the duplex communication transmission level registration circuit 44, as shown in FIG.
78 (shown in FIG. 4) is performed.

After determining in step S84 (shown in FIG. 4) that half-duplex communication and full-duplex communication are not registered,
As shown in FIG. 14, step S104 (shown in FIG. 6)
Step S176 including the processing from Step S110 to Step S110 (shown in FIG. 6) is executed. Step S11
In the case of 0, the signal transmission level is changed to the signal transmission level of the half-duplex communication at the time of the signal transmission after the time when the other party is determined to be the half-duplex communication.

Next, step S178 is executed.
In step S178, it is determined whether the communication mode is half-duplex communication. When the communication mode is half-duplex communication, step S180 is executed, and when the communication mode is not half-duplex communication, step S182 is executed.

In step S180, the first destination full-duplex / half-duplex communication registration circuit 45 or the second destination full-duplex communication unit 45 determines that the half-duplex communication is performed in response to the designated one-touch dial or shortened dial. Double / half-duplex communication registration circuit 4
Register in 6.

In step S182, the first destination full-duplex / half-duplex communication registration circuit 45 or the second destination full-duplex communication register 45 indicates that full-duplex communication is to be performed in response to the designated one-touch dial or shortened dial. Double / half-duplex communication registration circuit 4
Register in 6.

After registering the communication mode corresponding to the designated one-touch dial or speed dial, step S5
6 (shown in FIG. 2) is executed, and the CML is turned off.

As described above, it is possible to eliminate the error of the registration of the communication mode and to further simplify the operation.

In each of the above embodiments, half-duplex communication and image transmission are one-way full-duplex communication as communication modes, but image transmission is two-way full-duplex communication. The transmission level in full-duplex communication for image transmission in both directions is even lower than the transmission level in full-duplex communication for image transmission in one direction.

[0103]

As described above, according to the facsimile apparatus of the first aspect, the transmission level setting means sets the communication level.
Since the signal transmission level for half-duplex communication and the signal transmission level for full-duplex communication by the communication means are individually set, appropriate transmission is performed for the half-duplex communication method and the full-duplex communication method, respectively. By setting the level, it is possible to prevent the occurrence of a communication error and perform good communication.

According to the facsimile apparatus of claim 2,
For example, the signal transmission level during half-duplex
Set the signal transmission levels to different levels from each other.
Can be.

According to the facsimile apparatus of the third aspect , the possibility of occurrence of a communication error in half-duplex communication can be reduced.

According to the facsimile apparatus of claim 4, it is possible to appropriately switch the transmission level after discriminating between full-duplex communication and half-duplex communication.

According to the facsimile apparatus of the fifth aspect, it is possible to determine whether the communication mode is full-duplex communication or half-duplex communication according to the other party, and to appropriately control the transmission level. it can. According to the facsimile apparatus of the sixth aspect , half-duplex communication, image transmission is one-way full-duplex communication,
In the full-duplex communication in which the image transmission is two-way, appropriate switching can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of a facsimile apparatus of the present invention.

FIG. 2 is a flowchart for explaining a control operation by a control circuit in the facsimile apparatus of FIG. 1;

FIG. 3 is a flowchart for explaining a control operation by a control circuit in the facsimile apparatus of FIG. 1;

FIG. 4 is a flowchart for explaining a control operation by a control circuit in the facsimile apparatus of FIG. 1;

FIG. 5 is a flowchart for explaining a control operation by a control circuit in the facsimile apparatus of FIG. 1;

FIG. 6 is a flowchart for explaining a control operation by a control circuit in the facsimile apparatus of FIG. 1;

FIG. 7 is a diagram showing a sequence of half-duplex communication between the facsimile machine of FIG. 1 and a destination.

FIG. 8 is a diagram showing a sequence of full-duplex communication between the facsimile machine of FIG. 1 and a destination.

FIG. 9 is a flowchart for explaining a control operation in a second embodiment of the facsimile apparatus of the present invention.

FIG. 10 is a flowchart for explaining a control operation in a second embodiment of the facsimile apparatus of the present invention.

FIG. 11 is a flowchart for explaining a control operation in a third embodiment of the facsimile apparatus of the present invention.

FIG. 12 is a flowchart illustrating a control operation in a facsimile apparatus according to a fourth embodiment of the present invention.

FIG. 13 is a flowchart illustrating a control operation in a facsimile apparatus according to a fourth embodiment of the present invention.

FIG. 14 is a flowchart illustrating a control operation in a facsimile apparatus according to a fourth embodiment of the present invention.

[Explanation of symbols]

 8 V21 modulator 10, 18, 22, 26 Gain adjustment circuit 12 Reading circuit 14 Encoding circuit 16 V27ter modulator 20 Backward channel signal transmission circuit 24 Modulator 28 Adder circuit 30 V21 demodulator 32 V27ter demodulator 34 Decoding circuit 36 Recording Circuit 38 Backward Channel Signal Detection Circuit 40 Demodulator 43 Half Duplex Communication Transmission Level Registration Circuit 44 Full Duplex Communication Transmission Level Registration Circuit 45 First Destination Full Duplex / Half Duplex Communication Registration Circuit 46 Second Full-duplex / half-duplex communication registration circuit of other party 48 Control circuit

Claims (6)

(57) [Claims] In a facsimile apparatus in which half-duplex communication and full-duplex communication are selectably set as communication modes, the half-duplex communication and the full- duplex communication are selectively performed.
And viable communication means, and characterized by having a transmission level setting means for setting the transmission level of the transmission level and the full-duplex communication when the signal of the signal of the half-duplex communication separately by the communication unit Facsimile machine. 2. The communication level setting means, comprising:
Transmission level of signal during half-duplex communication and full-duplex communication
The signal transmission level at the time of
The facsimile apparatus according to claim 1, wherein 3. The communication level setting means according to claim 2, wherein
The communication unit transmission level of the signal at the time of half-duplex communication according to stage
It is set to a level higher than the transmission level of full-duplex communication when the signal facsimile apparatus according to claim 2, wherein by. 4. The communication means within a preset range.
Comprising registration means for registering a signal transmission level and full-duplex signal transmission level when communicating half-duplex communication with the communication
By means, before the communication mode is determined, the registered
Performs full duplex communication during the signal transmission level in signaling that, when this signal the after sending full duplex communication is selected, the registered
Continued signal delivered at the signal transmission level during full duplex communication is recorded, when the half-duplex communication is selected, the registration of
Any of claims 1 to 3, characterized in that to perform signal transmission in the signal transmission level at the time of half-duplex communication that
A facsimile apparatus according to one of the above. 5. A communication mode of one of half-duplex communication and full-duplex communication is registered for each destination, and a signal transmission level is determined based on the registered communication mode during a communication operation. Claim 1 or Claim characterized by the above-mentioned.
5. The facsimile apparatus according to any one of the above items 4 . 6. The communication mode can be set to half-duplex communication, one-way full-duplex communication for image transmission, and two-way full-duplex communication for image transmission, and a signal is transmitted according to each communication mode. facsimile apparatus according to any one of claims 1 to 5, characterized in that to change the level.