9. Method according to claim 7, comprising the steps of: counting successive word flags indicating erroneous data words; comparing the result of said counting with a first threshold value; generating a muting signal, when said value reach said first threshold value; start counting pulses of an increment generator when said first threshold value is reached; comparing the result of the counting of said pulses to a second threshold value; and stopping said muting signal when the result of the counting of said pulses reaches the second threshold value.
7. Method according to claim 5, comprising the step of; subsequent muting of data words.