Optical information recording medium and optical information recording medium reproducing device

An optical information recording medium reproducing device configured to:

• optically reproduce an optical information recording medium,
• the optical information recording medium including
• a continuously wobbling groove formed in advance by a constant angular velocity (CAV) or a zone CAV,
• in which information is allowed to be recorded on the groove and a land adjacent to the groove,
• address information is recorded by modulating the wobble,
• the address information includes a sync pattern indicating a position of the address information and address data, and
• the sync pattern includes a plurality of first wobble patterns and a second wobble pattern between the first wobble patterns, and at least part of intervals of the first wobble patterns are set to unequal intervals, wherein the at least part of the intervals decrease by 1 normal wave length (NWL) at a time;
• detect the first wobble patterns to detect the sync pattern;
• and
• decode the address data by the detection of the sync pattern,
• wherein the optical information recording medium reproducing device comprises:
• a wave detection circuit configured to generate a wave detection output based on the first wobble pattern and a reference wave;
• an accumulation circuit configured to accumulate outputs of the wave detection circuit;
• a series connection of a plurality of delay circuits to which an output of the accumulation is supplied and in which respective amounts of delay are set so as to simultaneously detect the plurality of first wobble patterns included in the sync pattern;
• an adder configured to add a plurality of accumulation outputs extracted from the series connection of delay circuits;
• and
• a threshold assessment circuit configured to perform threshold assessment on an output of the adder.