Method and apparatus of converting a series of data words into modulated signals

An apparatus of converting a series of data word into a modulated signal, comprising:

• a generator generating for each data word a number of alternative sequences by combining mutually different digital words with the data word;
• and
• a selector translating each alternative sequence into a (d,k) constrained sequence according to the predefined coding rate m/n, and selecting one (d,k) constrained sequence with the lowest, in absolute sense, contribution to the DSV (Digital Sum Value) for recording onto a recordable medium among the translated (d,k) constrained sequences.

An apparatus of converting a series of data word into a modulated signal, comprising:

• a generator generating for each data word a number of alternative sequences by combining mutually different digital words with the data word;
• and
• a selector translating each alternative sequence into a (d,k) constrained sequence according to the predefined coding rate m/n, sorting out sequences satisfying k runlength limit of “0”s persisting between the sequence and its previous (d,k) constrained sequence in the translated (d,k) constrained sequences, and selecting one (d,k) constrained sequence for recording onto a recordable medium among the sorted sequences.

An apparatus of converting a series of data word into a modulated signal, comprising:

• a generator generating for each data word a number of alternative sequences by combining mutually different digital words with the data word;
• and
• a selector translating each alternative sequence into a (d,k) constrained sequence according to the predefined coding rate m/n, sorting out sequences, each having at most kSET “0” runs between two “1”s where kSET is smaller than k, in the translated (d,k) constrained sequences, and selecting one (d,k) constrained sequence for recording onto a recordable medium among the sorted sequences.