JPH05304597A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To reduce the time till a reply signal is returned from a receiver after transmission of compression data while minimizing the deterioration in the transfer efficiency of compressed data in a facsimile equipment sending the compressed data without addition of any fill in one line. CONSTITUTION:The facsimile equipment is provided with a communication control section 3 which uses a data transfer inhibit signal outputted from a buffer memory section 4 to implement a re-transmission request or a fill transmission request to the sender side, after compression data received from a line 1 are transferred to a buffer memory section 4, and receives and throws away the received re-transmission data in the case of the re-transmission request and a buffer memory section 4 receiving compression data from the communication control section 3, storing the data in the buffer memory, transferring the data to a compression data decoding section 5, detecting a synchronizing code in the compression data at the time of input/output to/from the buffer memory and outputting a data transfer inhibit signal 9 to the communication control section 3 when the stored data in the buffer memory reaches a specified member of lines.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile machine, and more particularly to a facsimile machine for transmitting newspaper pages.

[0002]

2. Description of the Related Art Conventionally, a facsimile apparatus of this type transmits compressed data of image information read from a newspaper page without filling (FILL: pausing message flow) in order to improve transmission efficiency on a line, At the end of recording, a response signal indicating the operating state of the receiver (whether there was an abnormality) was returned to the transmitting side.

[0003]

Since the above-described conventional paper surface transmission apparatus transmits compressed data without filling, when compressed data having a high compression rate is transmitted, the compressed data is transmitted after the compressed data transmission is completed. It takes a considerably long time to complete the recording after decoding. Therefore, there is a drawback in that the timer value for monitoring whether or not the response signal indicating the operation state at the end of recording on the transmitting side is returned is very large.

Also, if the transmitting side inserts a fill into the compressed data on the paper to limit the minimum transmission time, it is possible to reduce the monitoring timer value, but there is a drawback that the transmission efficiency on the line is lowered.

[0005]

SUMMARY OF THE INVENTION A facsimile apparatus of the present invention is a facsimile apparatus which transmits compressed data of image information without adding a fill in one line, and stores the compressed data in a buffer memory and then decodes the compressed data. Buffer memory which outputs a prohibition signal indicating prohibition of data transfer when the stored data in the buffer memory reaches a prescribed number of lines when the synchronous code in the compressed data is detected at the time of input / output to / from the buffer memory. Section and the compressed data received from the line are transferred to the buffer memory section and a retransmission request or fill transmission request is made to the transmission side by the prohibition signal output from the buffer memory section. Has a communication control unit that discards the received retransmitted data.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.

In this embodiment, the compressed data received from the digital forward line 1 is transferred to the buffer memory unit 4 and transmitted via the digital backward line 2 by the data transfer prohibition signal 9 output from the buffer memory unit. Side to send a resend request or a fill send request, and in the case of a resend request, the communication control unit 3 that discards the received resend data, and the compressed data is input from the communication control unit 3 and stored in the buffer memory. Transfer to the compressed data decoding unit 5, detect the sync code in the compressed data at the time of input / output to / from the buffer memory, and transfer the data when the accumulated data in the buffer memory reaches a specified line or when the accumulated area in the buffer memory runs out. And a buffer memory section 4 for outputting a prohibition signal 9 for prohibiting the communication control section 3 to the communication control section 3.

Next, the operation of this embodiment will be described. The compressed data coming from the forward line 1 is the communication control unit 3
Is input to and the error check of the compressed data is performed.
If there is no error in the compressed data, it is transferred to the buffer memory unit 4. If there is an error, a retransmission request signal is sent out via the backward line 2. The compressed data transferred to the buffer memory unit 4 is transferred to the compressed data decoding unit 5 and decoded by the compressed data decoding unit 5 into image data. The image data on the newspaper surface decrypted into the image data is transferred to the recording unit 6 and then printed and recorded by the recording unit 6. When the speed of the compressed data input from the forward line 1 is faster than the recording speed of the recording unit 6, the compressed data is stored in the buffer memory unit 4. When the amount of compressed data stored in the buffer memory unit 4 reaches a specified value, a prohibition signal 9 indicating prohibition of data transfer is output.

FIG. 2 is a block diagram showing details of the buffer memory unit 4 of this embodiment. Buffer memory input line 7
The compressed data from is stored in the buffer memory 4-2 via the control unit 4-1. At the same time, the compressed data is input to the sync code detecting section 4-3, and the sync code added to the head of the compressed data is detected. The detected output signal is input to the up / down counter 4-4 and up-counted by the up / down counter 4-4. Buffer memory 4
At the time of reading the compressed data stored in -2, the synchronous code detecting unit 4-6 connected to the output line of the buffer memory unit detects the synchronous code in the compressed data. The detected output signal is input to the up / down counter 4-4,
The up / down counter 4-4 counts down. That is, the count value of the up / down counter 4-4 indicates the number of lines of the compressed data accumulated in the buffer memory 4-2. It is assumed that the output terminal of the up / down counter 4-4 generates a counter output when the counter value of the up / down counter 4-4 reaches a specified value. As the output signal when the count value of the up / down counter 4-4 reaches the specified value, a prohibition signal 9 for prohibiting data transfer is output via the OR gate 4-5. A signal indicating that there is no storage area in the buffer memory 4-2 is input from the memory control unit 4-1 to the other input terminal of the OR gate 4-5. This is to prevent the buffer memory 4-2 from overflowing when the compression rate of the compressed data is low and the data amount increases.

The data transfer prohibition signal 9 is input to the communication control unit 3. The communication control unit 3 makes a retransmission request to the transmitting side by inputting the data transfer prohibition signal 9. The communication control unit 3 discards the compressed data retransmitted in response to the retransmission request. If the communication control unit 3 does not have a retransmission function, a fill transmission request is issued. A fill or flag is received in response to a fill send request. By receiving the dummy data in this way, the number of lines of the compressed data stored in the buffer memory unit 4 can be limited to a specified value.

[0011]

As described above, according to the present invention, by setting the storage amount of compressed data to the specified number of lines, the response signal from the receiver for sending the compressed data can be suppressed while minimizing the decrease in the transfer efficiency of the compressed data. It is possible to shorten the time required to return the message and to reduce the timer value for monitoring the presence or absence of the response signal.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing details of a buffer memory unit of the present embodiment.

[Explanation of symbols]

 1 Digital Line (Forward) 2 Digital Line (Backward) 3 Communication Control Unit 4 Buffer Memory Unit 4-1 Memory Control Unit 4-2 Buffer Memory 4-3, 4-6 Sync Code Detection Unit 4-4 Up-Down Counter 4 -5 OR gate 5 Compressed data decoding unit 6 Recording unit

Claims (1)

[Claims] 1. A facsimile apparatus for transmitting compressed data of image information without adding a fill in one line, stores the compressed data in a buffer memory and then transfers the compressed data to a compressed data decoding unit, and inputs / outputs to / from the buffer memory. A buffer memory unit which sometimes outputs a prohibition signal indicating a prohibition of data transfer when the sync code in the compressed data is detected and the accumulated data in the buffer memory reaches a specified number of lines, and the compressed data received from the line Communication in which a retransmission request or a fill transmission request is made to the transmitting side by the prohibition signal output to the buffer memory unit and output from the buffer memory unit, and in the case of the retransmission request, the received retransmission data is discarded A facsimile machine having a control unit.