Apparatus for reliably fetching data, on the basis of framing code detection process, and method therefor

A data-fetching apparatus comprising:

• input means for periodically receiving a transmission signaliincluding a framing code and a data signal following the framing code, the framing code being constituted by a predetermined pattern which can be identified even if a bit error is included therein;
• signal-fetching means including extracting means for receiving the transmission signal from said input means, and extracting the framing code and the component of the data signal, both of which are included in the transmission signal, on the basis of a predetermined reference signal;
• framing code-detecting means for receiving an output from said signal-fetching means and comparing said output with prepared pattern data corresponding to the predetermined pattern of the framing code, said framing code-detecting means being adapted to generate a first framing code-detection output, for supply to said signal-fetching means, as a signal for providing the timing when the output from said signal-fetching means represents a bit error with respect to the pattern data, and to generate a second framing code-detection output when the output from said signal-fetching means represents no bit error with respect thereto;
• said signal fetching means also including data-fetching means for fetching a component of the data signal included in an output from said extracting means, on the basis of the first framing code-detection output, when said framing code-detecting means generates the first framing code-detection output on the basis of the reference signal;
• and
• reference signal-generating means for receiving the second framing code-detection ottput from said framing code-detecting means, and generating the predetermined reference signal supplied to said signal-fetching means, in response to the second framing code-detection output.