JPS61227478A - Facsimile reception system - Google Patents

Abstract

PURPOSE:To eliminate the disadvantage that a part of a data of a preceding line is left in a shift register of a print section by transferring a white data to the print section by remaining bit number in a fixed white section in a received picture data. CONSTITUTION:A switch 21 is thrown to the position of a reception demodulated data RD and the position of bit timing BT1 from the head of the reception face data of one line until a boundary t1 with the fixed white level part in the picture signal and the received picture data is transferred to the shift register 2 of the print section. The switch 21 is thrown to the position of a white data WHITEDATA and other bit timing BT2 side at a point of time t1, the white level data is transferred to the shift register 2 by the remaining bit number so as to absorb the difference between the total bit number of the head and the bit number of the white level data. Even when the total bit number of the received picture data of one line is less than the bit number possible for print of one line by the print section, the disadvantage that a part of the picture data of the preceding line is left in the shift register is eliminated and always excellent picture quality is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a reception control system for a facsimile machine.

(Prior Art) A reception control system for a conventional facsimile apparatus in communication with a facsimile apparatus having a tonal procedure (a communication protocol using tone signals) will be described below. FIG. 4 is a schematic diagram of a conventional reception control system. In Figure 4,
The demodulated and digitized received image data “RD” is
The data is sequentially transferred to the shift register in the printing section via the D flip-flop at pit timing BTI, latched by a signal LT indicating the end of one line, and printed.

(Problem to be Solved by the Invention) When the total number of printable bits of the printing section is N1 and the total number of bits of one demodulated line is N2, in the conventional method described above, when N1=N2, , if all bits of the current line are transferred to the shift register of the printing section, the problem of the received data from the previous line remaining in the shift register will not occur, but in the case of N 1 ) N 2 , part of the data from the previous line is always transferred. This has the disadvantage that it remains in the shift register, causing a great deal of inconvenience when printing.

As described above, the present invention is capable of transmitting 1
The purpose of this invention is to eliminate the drawback that when the total number of bits of image data of a line is less than the total number of pits that can be printed in one line of the printing section, a part of the data of the previous line remains in the shift register of the printing section. .

(Means for Solving the Problems) A feature of the present invention for achieving the above object is that a shift register is provided between the modulation/demodulation section and the printing section of the facsimile receiving device to temporarily store received image data to be printed. , a facsimile reception method for communicating with a facsimile machine having a tonal procedure, is provided with a switch that switches input data to a shift register between received image data and white data and also switches a transfer timing clock;
The facsimile reception method is such that the changeover switch is switched from the received image data and the first transfer timing clock to the white data and the second transfer timing clock at the boundary between the beginning of the received image data of the line and the fixed white portion.

(Operation) While the received image data continues, the received image data is accumulated in the shift register as in the conventional technique.

By switching the switch at time t□ when the received image data changes to the fixed white portion, white data is accumulated in the shift register, and therefore the shift register is filled with the received image data and white data. Therefore, the data of the previous row does not remain in the shift register, and the object of the present invention is achieved.

(Example) FIG. 1 shows an example of the present invention. FIG. 2 shows a one-line image signal format of a facsimile machine having a tonal procedure. FIG. 3 shows the process in which one line of image data is transferred to the shift register of the printing section using this method. First, in FIG. 1, 21 is a switch for switching the data to be transferred to the printing unit and the transfer timing clock, and the boundary t1 from the beginning of one line of received image data to the fixed white part in the image signal is Up to this point, the switch is switched to the received demodulated data RD side and the bit timing BTI side, and the received image data is transferred to the shift register of the printing section. Further, the state of the data in the shift register at that time is shown in FIG. 3 (4). Next, at time tl, the switch is switched to the white data WHI TEDATA and another bit timing BT/2 side, and the white data is transferred to the shift register by the remaining number of bits.

Switching of bit timing is performed to absorb the difference between the total number of pits of the head and the number of bits of white data. The state of the data in the shift register at that time is shown in Figure 3 (B
). As described above, by transferring white data equal to the remaining number of bits in the shift register of the print unit to the fixed white interval in each line image signal using another bit timing BT2, the previous line is transferred to the shift register of the print unit. This eliminates the drawback that some image data remains, and always provides good image quality.

(Effects of the Invention) As explained above, even if the total number of bits of one line of received image data is less than the number of bits that can be printed in one line of the printing part, the number of bits remaining in the fixed white section of the image data is Since the white data is transferred to the printing unit for the same amount of time, there is no disadvantage that part of the image data of the previous line remains in the shift register, and there is an advantage that good image quality can always be obtained.

The present invention transfers a predetermined number of bits of white data to the printing section in a fixed white interval in the received image data, so reception control is performed when the total number of pits in one line of received image data is less than the printable number of bits of the printing section. It can be widely used in various methods.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a one-line image signal format, and FIG. 3 is a diagram showing a process in which data is transferred to a shift register of a printing unit using the method of the present invention. 4 are diagrams showing conventional reception control. DESCRIPTION OF SYMBOLS 1...D flip-flop, 2...Printing section shift register, 21...Switcher, 31...Fixed white portion in image signal, 41...White data. Patent applicant Oki Electric Industry Co., Ltd. Patent application agent Patent attorney Megumi Yamamoto - Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] In a facsimile reception system that has a shift register for temporarily storing received image data to be printed between the modulation/demodulation section and the printing section of a facsimile reception device, and communicates with a facsimile device that has a tonal procedure, the input to the shift register is A switch is provided for switching the data between the received image data and white data and also switches the transfer timing clock, and the changeover switch is set at the boundary between the beginning of one line of received image data and the fixed white part. A facsimile reception method characterized by switching from a first transfer timing clock to a white data and second transfer timing clock.