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A method for improving answerback ratio of special purpose facsimile reception apparatus

A receiving device and facsimile technology, which can be applied to image communication, electrical components, etc., and can solve the problems of reduced report rate of dedicated facsimile receiving devices, etc.

Inactive Publication Date: 2004-08-18
SHANGHAI HUALONG INFORMATION TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The probability of correctly monitoring and receiving fax signals is called the reporting rate, which can also be called the monitoring rate. It is a key indicator to measure the special fax receiving device. Due to the above defects in the existing technology, the reporting rate of the special fax receiving device decreased

Method used

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  • A method for improving answerback ratio of special purpose facsimile reception apparatus
  • A method for improving answerback ratio of special purpose facsimile reception apparatus

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Experimental program
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Embodiment Construction

[0013] The process of automatically identifying the fax rate is as follows: figure 1 shown. After confirming that it is a non-standard fax (how to confirm?), execute step 100, set the Modem to the high-speed receiving state, that is, be set to the non-HDLC (advanced data link control) receiving state of 14.4kbps, receive the TCF signal, and the TCF signal is High-speed signals with different modulation methods and rates have different carriers, and then execute step 101, the Modem DSP RAM of CONNEXT refreshes a total of 96 sampling values ​​of the received signal at a sampling frequency of 9600 Hz, execute step 102, and read these values, The modulation mode and rate can be judged, because the symbol of the sampling value has a certain rule, and the rule corresponds to a certain modulation mode and rate, such as: the rate V.27ter 4800bps takes 24 bytes as a cycle; The modulation mode of V.29 takes 48 bytes as a cycle; the modulation mode of V.27ter2400bps and V.17 uses 8 byte...

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Abstract

The invention discloses a method for improving the message acquiring rate for facsimile receivers, wherein the facsimile rate is identified in the reception of the non-standard facsimile messages by using different signal carrier waves produced by different modulation modes and rate and obtaining a fixed frequency sample signal value, the corresponding connection between the sampling value rule and modulation mode and rate is determined, the current available interpretation function and corresponding marks on the hardware is utilized, the page and coding scheme combination is also changed. When a combination is used for interpretation, a plurality of lines are interpreted continuously, the page and coding scheme combination of which combination is selected.

Description

technical field [0001] The invention relates to a method for increasing the rate of receiving a special facsimile receiving device, in particular to a method for improving the rate of reporting by adopting the means of automatically identifying the facsimile rate and coding mode. Background technique [0002] The special fax receiving device is a special device used by national security departments such as public security and military forces to monitor and receive faxes. It is a fax machine without sending function. It has the functions of receiving, decoding and printing. to communicate. In the monitoring and receiving of non-standard faxes, the traditional method is to obtain information by deciphering some common non-standard signals, that is, by collecting non-standard information from different manufacturers, and analyzing the non-standard information through artificially repeated experiments meaning, so that when the same non-standard information is monitored, the spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/32H04N1/64
Inventor 方咏梅
Owner SHANGHAI HUALONG INFORMATION TECH DEV CENT