| 摘要 |
An information selection device of a disc player comprises a pickup device (1), a signal processing circuit (12) and a moving device (16). The signal processing circuit (12) comprises a read circuit (13), a write circuit (14) and a comparator (15). At the time of searching a desired piece number and a desired index, these desired piece number and index are written in the write circuit (14). The pickup device (1) radiates a light beam on a disc (8) so that the piece number and the index of the track traced at present are detected by the read circuit (13) at predetermined time intervals from the beam modulated and reflected on the disc (8). Then, the detected piece number and index are compared by the comparator (15) with the desired piece number and index written in the write circuit (14). As a result of the comparison, each time it is determined that the hitting point of the radiated beam has passed the track at the start of the desired piece number and index, the signal processing circuit (12) generates a different control signal and applies it to the moving device (16) so that the moving direction of the radiated beam is reversed and the moving speed of the beam is gradually decreased. After the above described operation is repeated by a predetermined number of times, the movement of the radiated beam is stopped and then the search is completed.
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