Method and apparatus for receiver-side elimination of static or slowly with time varying interference signals from input data signals in digital data transmission in a predetermined bitmap

Process for receiver-side elimination of static or slowly with time-varying optical or electrical interference signals from input data signals in digital data transmission in a given bitmap, said input data signals are filtered by a high pass filter having a time constant which is smaller than the bit time, and thus filtered in the input data signals signal rises and signal waste is detected and an output data signal is set to a first predetermined signal level when a signal rise is detected, and is set to a second predetermined signal level when a signal drop is detected, characterized in that the output data signal is set to the second predetermined level is when a predetermined limit number of bit times after detection of an increase signal has elapsed.