Device for recording a digital information signal on a record carrier

A device for recording a run length limited digital information signal of the d, k type in an information track of a record carrier, comprising:

• an input terminal for receiving the digital information signal
• an encoding device having an input coupled to the input terminal and having an output, which encoding device comprises an aT precoder, where a is an integer greater than or equal to 1 and T is the bit period of the digital information signal;
• and
• a recording device having an input coupled to the output of the encoding device for recording the encoded digital information signal in the information track on the record carrier;
• characterized in that:
• the encoding device comprises signal extending means for inserting at specific points in time a (d+m)-bit digital word into the digital information signal, where m is an integer greater than or equal to 1;
• the precoder is adapted for converting the extended digital information signal thus obtained into a channel signal for recording in the track on the record carrier;
• the encoding device further comprises control signal generating means for receiving the channel signal and deriving therefrom a control signal;
• and
• the signal extending means is adapted, in response to said control signal, to insert (d+m)-bit signal words into the digital information signal such that the extended information signal produced by the signal extending means is a run length limited signal of the d,k' type, where k' is an integer greater than or equal to k and, furthermore, the running digital sum value of the precoder output signal has a desired pattern as a function of time.