JP2002204345A - Communication apparatus, communication method and storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication apparatus capable of optimizing communication by transmitting optimum information amount in accordance with transmission speed even in an environment where communication equipments of various communication capacities are mixed. SOLUTION: The communication apparatus comprises image data processing means for processing image data for transmission, encode/decode means for encoding/decoding, modulation/demodulation means for modulating/demodulating, communication speed selection means for selecting one speed among a plurality of communication speeds, and transmission data information amount change means for changing transmission data information amount in accordance with above selected communication speed after the communication speed is selected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device, a communication method, and a storage medium.

[0002]

2. Description of the Related Art In recent image transmissions, the amount of information to be transmitted has been dramatically increased with an increase in the quality of transmitted images.

[0003] In accordance with this, the conventional ITU-T Recommendation V. 27ter, V.I. 19, V.I. V.17 as well as
A facsimile capable of communication is proposed according to F.34. 27ter 240
0 bps, V. 34 maximum communication speed 33.6Kbp
Various communication speeds up to s can be selected.

[0004] However, even if the transmitting side has the ability to perform sufficiently high-speed transmission, if the receiving side supports only a communication system with a low transmission capacity, or if the line condition is poor, a low communication speed is selected. In this case, the communication speed is naturally governed by the communication speed of the low communication system.

Further, a communication system such as a color facsimile is recommended by the ITU-T, and the amount of transmission data is dramatically increased, and the occupation time of the line, the communication time on the transmission side, and the telephone charge are apt to increase.

[0006]

However, conventionally,
V. 34 procedure and T.34. When handshaking is performed in 30 procedures, the amount of data to be transmitted is the same regardless of the transmission speed.

[0007] For example, when an original that can be transmitted to a normally transmitting party in about 5 minutes is sent to another transmitting party, the ITU-T T.30. Use the options for JPEG of 30ANNEX E color facsimile,
It is assumed that transmission is performed at a low compression rate of 00 × 400 dpi. It is not necessary to send to the other party at high resolution, but suppose from the usual communication time, it is safe to assume, so it is assumed that the same setting was sent. If the communication capability of the destination communication device is, for example, When only 27 ter is supported, the transmission time is required to be nearly seven times.

[0008] In addition, the communication speed has been increased, and even when transmission is performed to the same partner, the communication speed selected in accordance with the line condition has a tendency to differ for each communication.

For this reason, there is a problem that even if various parameters are registered in the telephone number book stored in the one-touch key or the facsimile, the effect may not be obtained.

As described above, in an environment where communication devices having various communication capacities coexist, it is necessary to examine the trade-off between the communication speed and the image quality. There is a problem that it is complicated to examine off.

The present invention provides a communication device, a communication method, and a communication method capable of optimizing communication by transmitting an optimal amount of information according to a communication speed even in an environment where communication devices having various communication capabilities are mixed. It is intended to provide a storage medium.

[0012]

SUMMARY OF THE INVENTION The present invention provides image data processing means for processing image data to be transmitted, encoding / decoding means for encoding / decoding, modulation / demodulation means for modulation / demodulation, Communication speed selection means for selecting one of the communication speeds from a plurality of communication speeds, and transmission data information amount changing means for changing the transmission data information amount in accordance with the selected communication speed after selecting the communication speed And a communication device having:

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIG. 1 shows a facsimile apparatus F according to a first embodiment of the present invention.
It is a block diagram showing S1.

The facsimile apparatus FS1 comprises: a CPU 1;
ROM 2, RAM 3, nonvolatile RAM 4, operation unit 5, display unit 6, image processing unit 7, reading unit 8, recording unit 9, drive unit 10, modem 11, NCU unit 12
And a destination telephone number detection unit 13.

According to a program stored in the ROM 2, the CPU 1 controls the entire facsimile apparatus FS1, that is, the RAM 3, the nonvolatile RAM 4, the operation unit 5, the display unit 6, the image processing unit 7, the reading unit 8, the recording unit 9, Part 10,
It controls the modem 11 and the NCU unit 12.

The RAM 3 stores the image data read by the reading unit 8 or the data recorded by the recording unit 9, and transmits a signal modulated by the modem 11 to the NCU 1.
2 stores binarized data output from the subscriber line 15. The RAM 3 is a memory used for demodulating the analog waveform input from the subscriber line 15 via the NCU 12 and the modem 11 and storing the binarized data.

The nonvolatile RAM 4 is a battery-backed SRAM, which stores data such as a telephone number unique to the facsimile machine FS1, a user abbreviation, and the like, and communication results, communication characteristics and maximum communication speed, which will be described in detail later. Information such as rate and call charge information is stored.

The operation unit 5 has a start key for transmission and reception, a mode key for designating operation modes such as fine and standard in a transmitted image, a copy key for copying, a stop key for stopping operation, and one-touch registration. Registration key, a registration key for registering information about the communication network such as the dial number and communication path, the maximum communication speed and the other party's information, a setting key for setting the calling time, a "time priority mode" key described in detail in FIG. , "Image quality priority mode" key and the like.

The CPU 1 detects the pressed state of these keys and controls each unit according to the detected state.

The display unit 6 includes a dot matrix type LCD and an LCD driver.
Various displays are performed based on the control from.

The reading unit 8 includes a DMA controller, a CCD,
Or, it is composed of a contact type image sensor (CS), a general-purpose IC, a binarizing circuit, and the like, digitizes read data using a CCD or CS under the control of the CPU 1, and sequentially stores the data in the RAM 3. What to send. The read image data may be transferred to the image memory via the image processing unit 7.

The image processing unit 7 performs resolution conversion, multi-value → binary conversion, multi-value → multi-value conversion, error diffusion, edge enhancement, MH,
A processing unit that performs MR, MMR encoding / decoding processing, raster-to-block conversion, block conversion-to-raster conversion, color conversion, and the like.

The recording unit 9 includes a DMA controller, B4 /
An A4 size thermal head or BJ printer head (bubble jet (registered trademark) printer head), a general-purpose IC, and the like, and under the control of the CPU 1,
The recording data stored in the RAM 3 is taken out and printed out as a hard copy.

The turbulence section 10 is composed of a stepping motor for driving the paper supply / discharge rollers of the reading section 8 and the recording section 9, a gear for transmitting the driving force of the motor, a driver circuit for controlling the motor, and the like. .

The modem 11 has a 34, V.I. 32, V.I.
32 bis, V.I. 17, V.I. 29, V.I. 27ter,
V. 23, V.I. 21 (H, L) modems, and a clock generation circuit and the like connected to these modems.
Under the control of the CPU 1, the transmission data stored in the RAM 3 is modulated, and the NCU (Network Con
control unit 12 via the subscriber line 15
Is output to The modem 11 introduces an analog signal from the subscriber line 15 through the NCU unit 12, demodulates the analog signal, and stores the binarized data in the RAM 3.

The NCU unit 12 includes a DC capturing circuit, an AC capturing circuit, a Ci / pole detection circuit, and a two-wire / four-wire conversion circuit, and connects the subscriber line 15 to the modem 11. Further, the handset 14 is also connected to the NCU unit 12.
Can be connected to

The other party telephone number detecting section 13 is a detecting section for detecting the other party telephone number generated by the exchange.
It is a part that captures an alternating current with an ohm and detects the telephone number from the generated signal.

The telephone line 15 is a subscriber line connected to the NCU unit 12.

The sensor section 16 includes a recording paper width sensor, a recording paper presence / absence sensor, a document width sensor, and a document presence / absence sensor, and detects the state of the document and the recording paper under the control of the CPU 1.

Next, the operation of the above embodiment will be described.

FIG. 2 is a flowchart showing the operation of the above embodiment.

Various embodiments are possible as embodiments of the present invention. 34 communication and color facsimile will be described as an example.

First, in S1, various conditions of data to be transmitted are read from the ROM 2, the RAM 3, and the nonvolatile RAM 4.

These are conditions set on the operation unit 5 by the user's operation and conditions registered in the ROM 2 in advance. Here, the resolution, encoding method, compression ratio, color / monochrome, data amount -The communication time threshold will be described as an example. Other than the conditions in this example (for example, a quantization table of JPEG (Joint Photographic Experts Group: a compression method of color still images by the same organization), a color space, a Huffman table, and a communication fee) may be added, and are unnecessary. Things may be deleted.

Here, the resolution is defined in ITU-T T.30. 4
The standard (standard resolutio
n of: 3.85 line / mm), fine (higher resolution o
f 7.7 line / mm), super fine (optional higher)
resolution of 15.4 line / mm), 100 dpi, 20
0 dpi, 300 dpi, and 400 dpi.

The encoding method is defined in ITU-TT. MH (Modified Huffman: data sign /
Decoding method), MR (Modified Read: facsimile coding method), MMR (Modified Modified Read: data coding / decoding method), JPEG and other coding methods.

The compression ratio is defined in ITU-TT. This is a Q parameter of the JPEG system specified by 81.

The above parameters are stored in ROM2, RAM3,
The data is read from the nonvolatile RAM 4, the resolution parameter is written into the function R, the encoding method is written into the function C, the compression ratio parameter is written into the function S, and the threshold of the maximum allowable communication time is written into the function P.

The threshold value of the maximum allowable communication time is the maximum communication time allowed in the communication time required for one page or one communication, and may be set by the user.
Further, the setting may be made for each communication.

Further, a charge function may be used by using communication charge information registered in the ROM 2 or the nonvolatile RAM 4 in advance.

In S2, when the "time priority mode" for optimizing the transmission time is selected, the drive unit 10 is set in a mode suitable for the set resolution, encoding method, color / monochrome information, and compression ratio. Is read from the reading unit 8 (S3). This may be read at a resolution higher than the resolution specified in step S1 so that it can be easily processed by resolution conversion described later.

The data read in S3 is subjected to the coding specified by the function C and the compression at the compression ratio specified by the function S, and is written into the RAM 3 (S4).

At S5, the data amount of the image signal is written into the function D.

Numerical values determined by S1 and S5 (R, C,
Based on (S, D, P), the minimum permissible communication speed is calculated by a function M (S6).

If the "image quality priority mode" in which the transmission time is not optimized in S2 and the image quality is set according to the image parameters set by the user is selected, the resolution specified by the function R and the color / monochrome setting is used. Read (S8).

Next, the read image is sequentially encoded and compressed as defined by functions C and S, and is written into the RAM 3 (S
9).

When the transmission time optimization mode is not used, a function M = 0 for calculating the minimum allowable communication speed is set (S10).

After reading the transmission data, the procedure shifts to a calling procedure by a known means.

Next, the V.V.
The outline of the facsimile communication of No. 34 will be described.

FIG. 3 shows the V.V. used in the above embodiment. 34 is a flowchart showing an outline of facsimile communication of No. 34.

In the case of facsimile, V. A transmission procedure in the half duplex mode of the T.34 modem is performed.

That is, when the transmitting terminal TX is connected to the receiving terminal RX
(S21), and when the receiving terminal RX answers the incoming call,
The transmitting terminal TX sends out a call signal CNG which is a single tone signal of a predetermined frequency (1100 Hz), and first, a phase 1 (S22) for establishing a session between modems.
To start.

In this phase 1 (S22), the receiving terminal RX sends out a signal ANSam, which is a predetermined tone signal subjected to amplitude modulation, and notifies the start of phase 1 (S22). When ANSam is received,
A calling menu signal CM mainly indicating a modulation method such as a modem type provided in the terminal itself is transmitted.

Upon receiving the calling menu signal CM, the receiving terminal RX selects a modulation method such as a modem type to be used at that time from a modulation method such as a modem type notified by the calling menu signal CM. A common menu signal JM for notifying the modulation method such as the selected modem type is transmitted. In this case, the receiving terminal RX transmits 34, and is notified to the transmitting terminal TX.

Upon receiving the common menu signal JM, the transmitting terminal TX sends out a CM terminator CJ and sets the function of the modem 11 so as to apply the modulation method such as the modem type notified by the common menu signal JM. .

After receiving the CM terminator CJ, the receiving terminal RX ends the output of the common menu signal JM.

When the type of the modem to be used is set in this way, the transmitting terminal TX performs line probing for investigating the characteristics of the line to be used, phase 2 (S23).
To start.

If the type of modem used is V. If the modem is other than the 34 modem, the phase shifts to the transmission procedure according to the modem type set to be used when the phase 1 is completed.

In phase 2 (S23), both modem information is exchanged (signal INFO sequence), and the transmitting terminal T
When the receiving terminal RX receives the line test tone (B, B *) transmitted by X, the line characteristics are determined,
The determination result is notified to the transmitting terminal TX. Where B
“*” Of * means a signal obtained by inverting B.

Next, the phase 3 (S24) for the primary channel equalizer training is executed. Here, the transmitting terminal TX sends out signals (S, S *, TRN) based on the result of the phase 2 (S23), and the receiving terminal RX uses the received signal to transmit a signal of the primary channel for receiving image information. Adjust the equalizer.

Next, phase 4 (S25) for starting up the control channel is executed. Here, the transmitting terminal TX and the receiving terminal RX respectively transmit the signal PPh and respond to the received signal PPh with the signal MPh sequence.

The transmission speed of the control channel and the transmission speed of the primary channel are exchanged by the signal MPh sequence. In addition, the transmission speed of each channel is set to the maximum possible transmission speed among transmission speeds equal to or less than the transmission speed indicated by both signal MPh sequences. That is, this phase 4
In (S25), the transmission speed of the image information is set.

In this way, when the processing is completed up to the phase 4 (S25) and the transmission rates of the control channel and the primary channel are set, the next phase 5 (S2)
In 6), a pre-facsimile transmission procedure signal is exchanged using the control channel.

That is, using the control channel,
The receiving terminal RX includes a digital identification signal DIS for notifying a standard function provided in the own terminal, a non-standard function identification signal NSF for notifying a non-standard function set in the own terminal, Is transmitted.

The transmitting terminal TX transmits the non-standard function identification signal NS
F, digital identification signal DIS, and called terminal identification signal C
Upon receiving the SI, a transmission function to be used at that time, such as an image size, is determined based on the value of the reception capability parameter notified by the digital identification signal DIS.

Further, according to ITU-T T.A. 30 ANEEX
Color facsimile functions specified by E and JPEG
The information such as the compression ratio and the quantization table are also exchanged here.

Then, it transmits a transmitting terminal identification signal TSI indicating its own terminal and a digital command signal DCS notifying the transmission function determined at that time.

The receiving terminal RX receives the digital command signal DCS
Is received, a reception preparation confirmation signal CFR indicating that
And moves to preparation for receiving image information.

In the next phase 6 (S27), using the primary channel, transmitting terminal TX transmits image information PIX after retraining the modem by signals S and S *. The receiving terminal RX receives the image information PIX,
The above error detection is performed. In this case, no error frame is detected, so the next phase 4 (S2
In 5), the facsimile transmission procedure signal is transmitted without performing the operation of resetting the modem speed. Phase 5 (S26)
, The signal PPS-N transmitted from the transmitting terminal TX
A message confirmation signal MCF is transmitted to UL (indicating the end of one block).

Thereafter, phase 6 for transmitting image information
(S27), phase 4 (S28) of exchanging the post-message signal, and phase 5 (S29) are repeated as many times as necessary.

After transmitting the last image information PIX (m), in phase 5 (S29), the transmitting terminal TX
Sends a signal PPS-EOP indicating the end of the procedure, while receiving terminal RX transmits message confirmation signal MCF.
Is sent. As a result, the transmitting terminal TX sends out the disconnection command signal DCN, and restores the telephone line 15. Also,
Upon receiving the disconnection command signal DCN, the receiving terminal RX restores the telephone line 15 (S31).

Next, phases 4 and 5, which are closely related to the above embodiment, will be described.

FIG. 4 is a flowchart for explaining phases 4 and 5, which are closely related to the above embodiment.

FIG. 5 is a diagram showing a transmission signal at the transmission terminal TX and a transmission signal at the receiver terminal RX.

In phase 4, by transmitting and receiving signal MPh, the transmission speed determines the parameters set up to phase 3.

The determined transmission rate is calculated by the function rate
(MPh) (S42).

In S43, the function rate (MPh)
And the minimum communication speed M calculated in advance in steps S6 and S9.

If M <rate (MPh), the process proceeds to phase 5.

At S46, the resolution, compression ratio, recording width, minimum transmission speed, quantization table, etc. D determined by 30
Declare the communication capability in IS.

In S44, the receiving-side DIS is received, and
At 45, the capability of the partner machine is confirmed. The resolution parameter declared by the partner is written into the function R ', the encoding method declared by the partner is written into the function C', and the parameter of the compression ratio declared by the partner is written into the function S '.

In response to this, in S46, the resolution, compression ratio, recording width, minimum transmission speed, quantization table, etc. 30
The communication is declared in the DCS defined in the above.

If the capability of the other party is equal to that of the transmitter, that is, if the other party can receive the signal under the conditions set by the transmitter, the process proceeds to S48. If the encoding method is not MMR, the image data stored in steps S4 and S8 is read from the RAM 3 and written into the MODEM 11 (S49). In the MODEM 11, the encoded data is modulated by a known modulation method, and transmitted to the telephone line 15 via the NCU 12. This is performed at a timing corresponding to phase 6 (S27) in the flowchart 2 shown in FIG.

In S48, when using MMR encoding,
The image must be re-encoded for the date information to be added to the header. Therefore, in S50, the header is decoded and header information is added. In S51, re-encoding is performed and data is written to the MODEM 11.

The decoding / encoding may be always performed without performing the expansion / image conversion (S48), and the decoding / encoding may not be performed without adding header information.

In S47, if at least one of the initial setting parameters on the transmitting side has a different capability on the receiver side,
In S52, the image data stored in the RAM 3 is decoded. If necessary, the resolution conversion declared by DIS
Make changes according to the compression parameters.

In S51, the re-encoded data is written to the modem 11 (S49).

In S43, when M> N or M = N, the rate (MP) determined in phase 4 (S25)
Each parameter that satisfies the maximum allowable transmission time in h) is calculated G (P, rate, D) (S53).

Thus, a new compression ratio, resolution, and encoding method (Sh, Rh, Ch) are calculated (S54).
In phase five. The DIS on the receiving side is received (S5).
5) In S56, the capability of the partner machine is confirmed.

The resolution parameter declared by the partner is written into a function R ′, the encoding method declared by the partner is written into a function C ′, and the compression ratio parameter declared by the partner is written into a function S ′.

Since the parameters R ', C', S 'and S54 have been calculated (Sh, Rh, Ch), the parameters used in the communication of the above embodiment are determined, and the DCS is declared (S57).

The image data stored in the RAM 3 is decoded, the resolution conversion / compression parameters are changed as necessary, and the resolution conversion / compression is performed according to the parameters (S58).

Here, when re-encoding for adding information to the image header is required as in the case of MMR, or the fact that the original color image has been changed to the resolution, Q value, color table, or monochrome is added to the image. However, in the case of re-encoding, it is added in S60 and re-encoded in S51.

In S51, the re-encoded data is written to the modem 11 (S49).

In the above embodiment, the memory transmission is performed after the reading is completed first, but after the negotiation is completed in phase 4, conditions such as resolution are determined, and the image is read based on the determined conditions. It is also effective in the direct transmission mode.

[Other Embodiments] The above embodiment is similar to that of 34, but the transmitting side has the T.34. Even if the number 30 is used, the receiving capability of the other party can be known before the capability declaration, so that the above embodiment can be utilized.

The transmitting side transmits a non-standard function identification signal NSF,
By receiving the digital identification signal DIS and the called terminal identification signal CSI, the capability of the receiver can be known.

Here, the amount of communication data, the communication time, and the communication charge are determined based on the communication speed capability of the receiver, the presence or absence of the color reception function, the supported resolution and the compression ratio, and the like are compared with a predetermined threshold value. , The most suitable communication can be selected.

This is described in V. 34.

Next, T. The operation of the above-described embodiment in the fallback unique to 30 will be described.

When the actual communication falls back to a lower communication speed due to the training, the communication time and the call charge are recalculated in accordance with the lowering of the communication speed, and are compared with a predetermined threshold.

FIG. 6 shows the T.D. used in the above embodiment.
FIG. 7 is a diagram illustrating an operation in a fallback specific to 30.

When the transmitting terminal TX receives a predetermined frequency (1100H
The call signal CNG which is a single tone signal of z) is sent to the receiving terminal RX, and first, phase 1 for establishing a session between modems is started (S71).

When receiving terminal RX receives this signal,
A digital identification signal DIS that recognizes that the call is from a non-talking terminal and notifies a standard function provided in the terminal itself.
And a non-standard function identification signal NSF for notifying the non-standard function set in the own terminal and a called terminal identification signal CSI for indicating the own terminal.

The transmitting terminal TX is provided with DIS, NSF, CSI
(S72), and the communication speed, resolution, presence / absence of color communication, compression ratio, recording width, quantization table, etc. Declaration of the communication parameters determined in 30 is made (S73).

Here, it is assumed that 14.4 Kbps, ECM, and color communication are declared.

The training sequence (S74) is performed.

V. 27ter or V.I. The training data generated in step 29 is transmitted, and the MOD on the receiver side is transmitted.
Activate the EM automatic equalizer.

Next, in order to check whether or not the training has been performed correctly, a predetermined time “0” is continuously transmitted.
The CF is transmitted (S75).

[0109] If the TCF is received correctly, the receiver transmits the CFR.

Here, when the TCF is not normally received, the FTT is transmitted instead of the CFR. Upon receiving this, the transmitter reduces the communication speed to a predetermined speed (S7).
6).

Here, fallback from 14.4 Kbps at the start to 9600 bps is performed.

In the above method, the communication time at this communication speed
Calculate call charges, determine new resolution, presence / absence of color communication, compression ratio, recording width, quantization table, etc.
To declare the communication capability (S77). Here, 960
It is assumed that parameters are declared in 0 bps, ECM, and color.

In steps S78 and S79, steps S74 and S74 are executed.
As in 75, the training and TCF are transmitted.

In S80, if the receiver does not correctly receive the TCF again, instead of the CFR again,
Send FTT.

When this is received by the transmitter (S80), the transmitter further falls back and sets the communication speed to 960.
Change from 0 bps to 7200 bps.

With the above method, the communication time, the communication charge, etc. are calculated again, the new resolution, the presence / absence of color communication, the compression ratio, the recording width, the quantization table, etc. are determined, and the DCS declares the communication capability.

Here, the communication speed is reduced to 7200 bps, and the data transmission speed is lower than 14.4 kbps.
Twice the time is required. As a result of comparison with the threshold value in the above embodiment, the parameter declaration is changed from color transmission to monochrome transmission.

In S82 and S83, training and TCF are transmitted as in S78 and S79. Where TC
If F is successfully received, send CFR.

When the transmitter receives the CFR normally, the DCS
The image data is generated by the method declared in (1) (S85).
At this time, the encoding may be performed in addition to the image such as “the original is color”.

The coded data is written into the MODEM 11, and the coded data is modulated by a known modulation method, and is transmitted through the NCU 12 to the telephone line 1.
Send to 5.

Further, when the capacity of the image buffer on the receiver side is small and transmission of RNR (Receive Not Ready) is repeated, a longer communication time than expected is required.

In this case, before changing to the next page, the mode may be changed as follows. First, when the transmitter sends out a PPS-EOM (End Of Message) and receives an MCF (Message Configuration) from the receiver, it declares an optimal parameter in the same manner as the above procedure.

When the communication time or the communication fee is set in advance, optimal image data that can be transmitted within the time and the fee may be generated and transmitted in the above-described procedure.

According to the above embodiment, after selecting the communication speed, the transmission data information amount is changed in accordance with the selected communication speed, so that optimal data transmission can be performed for each communication.

Further, according to the above-described embodiment, after selecting the communication speed, the V.100 is set. Since the amount of transmission data information is changed in accordance with the selected communication speed by using the procedure of 34, optimal data transmission can be performed for each communication.

Further, according to the above embodiment, after the communication speed is selected in accordance with the procedure, the resolution of the transmission image is changed in accordance with the selected communication speed, so that the image quality and the communication speed can be determined for each communication. Optimal balanced data transmission can be performed.

According to the above embodiment, there is provided a color image data processing means for processing the color image data to be transmitted. By changing at least a part of the above, it is possible to perform optimal data transmission in which the image quality and the communication speed are balanced.

In addition, according to the above embodiment, after selecting the communication speed by the procedure, at least one of the quantization table, the Q value, and the resolution is adjusted according to the selected communication speed.
By changing one of them, optimal data transmission that balances image quality and communication speed can be performed most efficiently.

Further, according to the above-described embodiment, since the transmitter that grasps the image content has the right to determine the parameter of the image quality, it is possible to change the resolution most suitable for the transmission image.

Further, according to the above-described embodiment, by changing at least a part of the transmission data in accordance with the communication speed selected every time the communication speed is changed, even if the communication speed is changed during the communication. In addition, optimal data transmission that balances image quality and communication speed can be performed most efficiently.

According to the above-described embodiment, when a certain amount of data transmission time exceeds a predetermined value, a mode change is performed and at least a part of the transmission data is changed, so that some reason may occur during communication. Even when communication takes time, optimal data transmission that balances image quality and communication speed can be performed most efficiently. Even if noise is generated in the transmission path or communication device and ECM occurs frequently and the communication time becomes unnecessarily long or the communication speed is changed in the middle, the image quality and the communication speed can be balanced from the next page. Optimal data transmission can be performed most efficiently.

Further, according to the above embodiment, when the RNR from the receiver is received a predetermined number of times or more, when the memory capacity of the receiver is too small to keep up with the transmission speed, the mode is changed and the transmission data is transmitted. By changing at least part of the data, optimal data transmission that balances image quality and communication speed can be performed most efficiently.

Further, according to the above-described embodiment, by changing the above items in accordance with the communication time obtained from the selected communication speed, the optimum data transmission in which the image quality and the transmission time are balanced can be optimized. It can be done efficiently.

According to the above embodiment, by changing the above items in accordance with the communication fee determined from the selected communication speed, optimal data transmission with a balance between image quality and communication fee can be achieved most efficiently. Can be done.

Further, according to the above-described embodiment, the user sets arbitrarily the priority between the image quality and the transmission time by setting whether or not to automatically change at least a part of the transmission data. Optimum data transmission with more balance can be performed.

According to the above embodiment, whether or not at least a part of the transmission data is automatically changed is set, and when the setting is performed, the threshold value is set in association with the transmission destination, thereby setting the image. Optimal data transmission with a balance between quality and communication fee can be performed without requiring the user to make complicated settings for each communication.

In addition, according to the above embodiment, after selecting the communication speed, the transmission data information amount is changed so that the communication is completed within the maximum communication time set by the user.
If the user manages only the communication time without complicated settings, the transmission data information amount is automatically managed.

Further, according to the above embodiment, after selecting the communication speed, the amount of transmission data information is changed so that the communication is completed within the maximum communication charge set by the user. It can be managed only by the communication fee without having to do it.

Note that the above embodiment can be understood as an invention of a storage medium. That is, in the above embodiment, the image data processing procedure for processing the image data to be transmitted, the communication speed selection procedure for selecting one of the communication speeds from a plurality of communication speeds, the communication speed FIG. 11 is an example of a computer-readable storage medium storing a program for causing a communication device to execute a transmission data information amount changing procedure for changing a transmission data information amount according to a set communication speed.

In the above embodiment, the image data processing procedure for processing the image data to be transmitted and the ITU-T Recommendation V.
Procedure support procedure that supports 34 procedures and IT
U.T. Recommendation V. 34, after determining the communication speed in accordance with the procedure, a transmission data information amount changing procedure for changing the transmission data information amount in accordance with the selected communication speed. It is an example.

Further, in the above embodiment, the image data processing procedure for processing the image data to be transmitted, the communication speed selection procedure for selecting one of the communication speeds from a plurality of communication speeds, A computer storing a program for causing a communication device to execute a transmission data information amount changing procedure of changing a transmission data information amount so as to become the most reproducible image data in which communication ends within a maximum communication time set by a user. It is an example of a readable storage medium.

The storage media include FD, CD,
DVDs, HDs, semiconductor memories, and the like can be considered.

[0143]

According to the first, fifteenth, and eighteenth aspects of the present invention, after selecting the communication speed, the amount of transmission data information is changed in accordance with the selected communication speed. There is an effect that transmission can be performed.

According to the second, sixteenth, and nineteenth aspects of the present invention, after the communication speed is selected, the V.300 is set. Since the amount of transmission data information is changed in accordance with the selected communication speed using the procedure of No. 34, an effect is obtained that optimal data transmission can be performed for each communication.

According to the thirteenth, seventeenth and twentieth aspects of the present invention, after selecting the communication speed, the transmission data information amount is changed so that the communication is completed within the maximum communication time set by the user. If the communication time is managed without complicated settings, the transmission data information amount is automatically managed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a facsimile apparatus FS1 according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment.

FIG. 3 shows the V.V. used in the above embodiment. 34 is a flowchart showing an outline of facsimile communication of No. 34.

FIG. 4 is a flowchart illustrating phases 4 and 5 closely related to the embodiment.

FIG. 5 is a diagram illustrating a transmission signal at a transmission terminal TX and a transmission signal at a receiver terminal RX.

FIG. 6 shows the T.D. used in the above embodiment. FIG. 7 is a diagram illustrating an operation in a fallback specific to 30.

[Explanation of symbols]

 FS1 facsimile machine, 1 CPU, 2 ROM, 3 RAM, 4 nonvolatile RAM, 5 operation unit, 6 display unit, 7 image processing unit, 8 reading unit, 9 recording unit, 10 ... Drive unit, 11 ... Modem, 12 ... MCU unit, 13 ... Destination telephone number detection unit.

Claims (20)

[Claims] An image data processing means for processing image data to be transmitted; a communication speed selecting means for selecting one of a plurality of communication speeds from a plurality of communication speeds; A transmission data information amount changing means for changing a transmission data information amount according to a communication speed. 2. An image data processing means for processing image data to be transmitted; Procedure support means for supporting the ITU-T Recommendation V.34 procedures; 34
A transmission data information amount changing unit that changes the transmission data information amount according to the selected communication speed after determining the communication speed by a procedure. 3. The transmission data information amount changing means according to claim 1, wherein the transmission data information amount changing means changes the resolution of the transmission image in accordance with the selected communication speed. Communication device. 4. The transmission data amount according to claim 1, further comprising a color image data processing means for processing the color image data to be transmitted, and after determining a communication speed by a procedure. The communication device, wherein the changing unit changes at least a part of the transmission image data according to the selected communication speed. 5. The transmission data information amount changing means according to claim 4, wherein the transmission data information amount changing means adjusts the communication speed according to the selected communication speed by selecting a quantization table, a Q value of JPEG compression, or a resolution. A communication device wherein at least one is changed. 6. The transmission data information amount changing means according to claim 1, wherein the transmission data information amount changing means adjusts at least a part of the transmission data in accordance with the selected communication speed. A communication device, wherein 7. The transmission data information amount changing means according to claim 1, wherein the transmission data information amount changing means performs a mode change when a predetermined amount of data transmission time exceeds a predetermined value, and A communication device characterized in that at least a part thereof is changed. 8. The transmission data information amount changing means according to claim 1, wherein a mode change is performed when the RNR from the receiver is received a predetermined number of times or more.
A communication device for changing at least a part of transmission data. 9. The transmission data amount, the resolution of the transmission image, the transmission image data, and the transmission data amount according to any one of claims 1 to 7, according to a communication time obtained from the selected communication speed. A communication device, wherein at least one of the quantization table, the Q value of the JPEG compression, and the resolution is changed. 10. The communication device according to claim 1, wherein the item is changed in accordance with a call charge obtained from the selected communication speed. . 11. The communication according to claim 1, further comprising a setting unit for setting whether or not at least a part of the transmission data is automatically changed by a user. apparatus. 12. The method according to claim 11, wherein the setting unit determines whether or not at least a part of the transmission data is automatically changed, and when performing the automatic change, sets a threshold value of the data amount for performing the automatic change. A communication device, which is set in association with a transmission destination. 13. An image data processing means for processing image data to be transmitted; a communication speed selecting means for selecting one of a plurality of communication speeds from a plurality of communication speeds; A transmission data information amount changing means for changing the transmission data information amount so as to obtain the most reproducible image data in which the communication is completed within the maximum communication time. 14. The transmission data amount according to claim 13, wherein after determining the communication speed, the transmission data information amount is changed to the most reproducible image data in which the communication is completed within the maximum communication charge set by the user. Communication device. 15. An image data processing step of processing image data to be transmitted; a communication speed selecting step of selecting one of the plurality of communication speeds; and determining the communication speed after determining the communication speed. A transmission data information amount changing step of changing the transmission data information amount according to the communication speed;
A communication method, comprising: 16. An image data processing step for processing image data to be transmitted; Procedure support stage supporting the ITU-T Recommendation V.34. 3
A transmission data information amount changing step of changing the transmission data information amount in accordance with the selected communication speed after determining the communication speed by four procedures. 17. An image data processing step of processing image data to be transmitted; a communication speed selection step of selecting one of the communication speeds from a plurality of communication speeds; and a user setting after determining the communication speed. A transmission data information amount changing step of changing the transmission data information amount so as to obtain the most reproducible image data in which communication is completed within the maximum communication time. 18. An image data processing procedure for processing image data to be transmitted; a communication speed selecting procedure for selecting one of the communication speeds from a plurality of communication speeds; A transmission data information amount changing procedure for changing the transmission data information amount according to the communication speed;
Computer-readable storage medium storing a program for causing a communication device to execute the program. 19. An image data processing procedure for processing image data to be transmitted; Procedure support procedures supporting the ITU-T Recommendation V.34 3
A computer-readable storage medium storing a program for causing a communication device to execute a transmission data information amount changing procedure of changing the transmission data information amount in accordance with the selected communication speed after determining the communication speed by the four procedures. . 20. An image data processing procedure for processing image data to be transmitted; a communication speed selecting procedure for selecting one of the communication speeds from a plurality of communication speeds; and a user setting after determining the communication speed. Computer-readable storage storing a program for causing a communication device to execute a transmission data information amount changing procedure of changing a transmission data information amount so as to obtain the most reproducible image data in which communication ends within a maximum communication time. Medium.