FACTOID # 22: The top nations for per capita imports and exports tend to be very small.
 
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Encyclopedia > Error correction mode

Error correction mode (ECM) is an optional transmission mode built into Class 1 fax machines or fax modems. ECM automatically detects and corrects errors in the fax transmission process that are sometimes caused by telephone line noise.


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Patent 5127013: Data communication system (14131 words)
A data communication system, capable of operating in an error correction mode, is capable of producing, when data received in an error correction mode could not be correctly recorded, information indicative of the occurrence of such a recording failure.
When an error exists in data received in the error correction mode, a message is recorded subsequent to the recording of the received data to announce the presence of the error, thus facilitating recognition of the occurrence of error.
The recording of information representative of the presence of image error is executed by outputting a signal of "1" level to the signal line 38i, generating a pulse on the signal line 38h and, after the recording, signal of "0" level is delivered to the signal line 38i.
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