Data modems having data drop-out and data echo protection

Details Data modems having data drop-out and data echo protection Data modems having data drop-out and data echo protection

1975-08-01

1977-02-22

Stewart, David L.

Telegraphy

Systems

Printing

178 69G, 179 2DP, 325 41, 325323, 325478, H04L 2508

Patent

active

040093565

ABSTRACT:
Disclosed is an automatic data communication system having communicating modems equipped with automatic equalizers. The equalizers respond to a first long equalization sequence automatically transmitted from another modem. In response to that long equalization sequence, the equalizer starts from a preset non-equalized condition and assumes a fully equalized condition. That equalized modem is also capable of automatically transmitting its own long equalization sequence to the other modem. Thereafter, second short equalization sequences are employed at the receiving modems to enable a memory storage associated with the automatic equalizers. The memory stores, in response to the long equalization sequence, signals which are indicative of the fully equalized condition. Accordingly, the equalizers do not have to start from a non-equalized condition for each new data message unless a dramatic distortion occurs. If such distortion does occur, it is automatically detected and long equalization sequences are again employed to fully re-equalize. The disclosed modems have detection means for automatically distinguishing between equalization sequences, line drop-outs, and data echoes.

REFERENCES:
patent: 2248746 (1941-07-01), Davis
patent: 3711777 (1973-01-01), Tink
patent: 3755744 (1973-08-01), Fukata

Affiliated with

Also associated with

Rating

Data modems having data drop-out and data echo protection does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Data modems having data drop-out and data echo protection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data modems having data drop-out and data echo protection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-325546