Digital data processing apparatus capable of converting CD-DA audio data into blocks

A digital data processing apparatus comprising:

• a disc reproduction section for reading digital information from a disc in accordance with a predetermined clock, and for outputting a plurality of blocks of data and the digital information, wherein the digital information includes digital data and address information, the disc reproduction section comprising:
• detecting means for receiving the digital information read by the disc reproduction section, for detecting an operation execution command signal, for sequentially detecting the address information when the detecting means detects the operation execution command signal, and for outputting a detection signal in accordance with the sequentially detected address information;
• and
• block signal generating means for generating block signals, the block signal generating means comprising:
• a counter for counting a number of clock pulses of the predetermined clock, and for outputting the counted number of clock pulses;
• first comparing means for receiving the counted number of clock pulses, for comparing the counted number of clock pulses with a first predetermined number, and for outputting a comparison signal based upon the result of the comparison of the counted number of clock pulses with the first predetermined number, the first predetermined number corresponding to a number of bytes which constitute one of the plurality of blocks of data;
• initializing means for receiving the comparison signal and the detection signal, and for initializing the counter based upon one of the comparison signal and the detection signal;
• second comparing means for receiving the counted number of clock pulses, for comparing the counted number of clock pulses with a second predetermined number, and for outputting the result of the comparison as one of the block signals, the second predetermined number being greater than a predetermined maximum byte-base variation, caused by a jitter of the sequentially detected address information, the second predetermined number being less than a third predetermined number which is based upon a predetermined minimum byte-base variation, due to the jitter, between the sequentially detected address information;
• and
• means for receiving the digital information read by the disc reproducing section and the block signals, and for generating the plurality of blocks of data based upon the digital information, and the block signals;
• and
• a host processing section for receiving the blocks of data and for performing a predetermined data processing operation.