JPS63308465A - Controller for output to facsimile terminal - Google Patents

Abstract

PURPOSE:To secure efficient communication without affecting on the record of a facsimile terminal even when the delay of picture signal data supplied from a host equipment is generated, by adjusting the remaining quantity of an output buffer by adding an appropriate number of fill bits. CONSTITUTION:When the amount of the picture signal data in the output buffer 16 is reduced with the lapse of a transmission time and as a result, the amount of the data in the output buffer 16 is reduced less than a managing limit quantity U0 at a time t2, a comparison means compares the data amount in the output buffer 16 with a prescribed value. And when it is decided that the data amount is reduced less than the managing limit quantity U0, a one line minimum transmission time set at a time T0 is changed to a one line min imum transmission time T1 larger than the T0. Consequently, the picture signal data 15 on which the appropriate number of fill bits is attached is supplied to the output buffer 16, and communication at a preset communication speed can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an output control device used, for example, to transmit image signal data created by a host computer to a facsimile terminal.

[Conventional technology]

In Group 3 digital facsimile devices recommended by CCITT (International Telegraph and Telephone Consultative Committee), the communication speed of image signal data is determined by a pre-procedure with the other device that is performed prior to communication of image signal data. It looks like this. Therefore, a device that communicates with a facsimile terminal cannot perform normal image signal communication unless it transmits image signal data at the determined speed.

[Problem that the invention seeks to solve]

Conventionally, communication speeds have been set taking into consideration the worst case scenario, such as a delay in the supply of image signal data due to circumstances on the host device side. That is, the worst value of the sending speed of the image signal data is determined, and the communication speed is actually set below this worst value. However, with this communication method, although normal communication is ensured, there is a problem in that efficient communication cannot be performed in cases where the device side supplies image signal data without delay.

SUMMARY OF THE INVENTION An object of the present invention is to provide an output control device for a facsimile terminal that can perform efficient communication with the facsimile terminal without considering the worst state of the host device.

[Means for solving problems]

The present invention includes (1) a manual buffer for receiving image signal data sent from a host device, and (ii) addition of fill pits for encoding this image signal data and ensuring the minimum transmission time for one line. (ii)
i) an output buffer for storing image signal data that has passed through this signal processing means for outputting it to a facsimile terminal;
(v) comparison means for comparing the amount of image signal data in the output buffer with a predetermined value; and (V) when the comparison means determines that the amount of data in the output buffer is greater than or equal to the predetermined value, the minimum transmission for one line is performed. Set the time to time TO,
At all other times, the output control device for the facsimile terminal is provided with a one-line minimum transmission time setting means for setting a predetermined time T1 larger than this time TO.

That is, in the present invention, when there is a delay in the supply of image signal data from the host device and the data in the output buffer becomes small, fill pits are added and the image signal data is sent out, and the set communication speed is increased. Ensure communication by.

〔Example〕

The present invention will be described in detail with reference to Examples below.

FIG. 1 shows an outline of an output control device in an embodiment of the present invention. This device includes a manual buffer 12 into which image signal data 11 is input from a higher-level device such as a host computer (not shown). Human power buffer 12
The image signal data 13 read out is input to the processing section 14, where predetermined processing is performed. The image signal data 15 outputted from the processing section 14 is inputted into an output buffer 16, from which it is sent as encoded image signal data 17 to a facsimile terminal (not shown).

By the way, the processing unit 14 decodes the image signal data 13 read out from the input buffer 12 into the data format of the destination facsimile terminal, and then performs encoding. Then, fill pits are added in accordance with the minimum transmission time TO for one line notified in advance, and the data is sent to the output buffer 16 as image signal data 15.

The output buffer 16 transmits the image signal data 17 to the facsimile terminal at a predetermined transmission speed, but as explained above, if the output buffer 16 becomes empty during transmission, data underflow occurs and the facsimile Normal communication to the terminal becomes impossible. Therefore, in this example,
As shown in FIG. 2, the remaining amount of data in the output buffer 16 is indicated by a broken line. Set. The data in the output buffer 16 is the control limit amount U. In the above cases, set the minimum transmission time for one line. Also,
In other cases, the minimum transmission time for one line is set to a predetermined time T1 larger than the time TO, and an appropriate amount of fill pits are added. That is, when the remaining amount of the output buffer 16 is small, the amount of fill pits occupying in the image signal data 15 is increased by using the fill pit addition function in the processing section 14, so that the amount of data in the output buffer 16 is reduced. The speed will be slower.

This will be explained in FIG. Time t. As time passes, the image signal data in the output buffer 16 decreases. When data processing by the host computer ends at time t1, a large amount of image signal data is supplied to the processing section 14 at once. The processing unit 14 processes this and supplies a certain amount of it to the output buffer 16 at once as image signal data 15, and then outputs the remaining data as image signal data 15 after a certain amount of time. Supplied to buffer 16. When the image signal data 15 is supplied to the output buffer 16 all at once, the amount of data in the output buffer 16 increases rapidly as shown in FIG.

Since this output control device transmits data to the facsimile terminal at a predetermined communication speed, the image signal data in the output buffer 16 decreases as time passes. Assume that as a result of this, the data in the output buffer 16 becomes less than the control limit quantity o at time t2. Comparing means (not shown) compares the amount of image signal data in the output buffer 16 with a predetermined value. And the data is the control limit quantity U. When it is determined that the one-line minimum transmission time T1 is longer than this, the one-line minimum transmission time set in TO is changed to a predetermined one-line minimum transmission time T1 that is longer than this.

As a result, the output buffer 16 is supplied with the image signal data 15 to which an appropriate amount of fill pits have been added, and the rate of decrease of the image signal data in the output buffer 16 is reduced.

It is assumed that thereafter data processing is performed one after another at each time t3 to t5. First, at time t3, cover sofa 1
The image signal data within 6 is the control limit amount Ll.

If the above is reached, the minimum transmission time for one line is set to TO again from this point on. In this example, the data thereafter is the control limit amount U. If the value is less than 1, communication will continue in the state (none).

〔Effect of the invention〕

As explained above, according to the present invention, the remaining part of the output sofa is sub-aligned by adding fill pits as appropriate, so even if there is a delay in the image signal data supplied from the first-place device, Efficient communication can be ensured without affecting the records of the Facunmi terminal in any way.

[Brief explanation of the drawing]

The drawings are only for explaining one embodiment of the present invention. Among them, Fig. 1 is a block diagram showing an overview of the output control device to the Facunmi terminal, and Fig. 2 shows the amount of data stored in the output buffer. FIG. 2 is an explanatory diagram showing temporal changes in FIG. 11.13.15.17...Both signal data, 1
2...Input buffer, 14...Processing unit,
16...Output buffer, To, Tl...1 line minimum transmission time.

Claims (1)

[Claims] An input buffer that receives image signal data sent from a host device, a signal processing means that encodes this image signal data and adds film pits to ensure a minimum transmission time of one line, and this signal processing means. an output buffer that temporarily stores the image signal data that has passed through the process to output it to a facsimile terminal; a comparing means that compares the amount of image signal data in the output buffer with a predetermined value; 1-line minimum transmission time setting means for setting the 1-line minimum transmission time to time T0 when it is determined that is equal to or greater than the predetermined value, and otherwise setting the 1-line minimum transmission time to a predetermined time T1 larger than the time T0. An output control device for a facsimile terminal, comprising: