Claims
- 1. A disk player comprising:
- disk driving means for driving a disk; detecting means for reading a data signal from said disk;
- synchronization detecting means for detecting when a frequency of a detection signal is synchronized with a predetermined frequency which permits reproduction of said data signal, said detection signal being outputted when the data signal is detected from said detecting means;
- shift detecting means for detecting when a frequency of said detection signal outputted by said detecting means is shifted at least predetermined value from said predetermined frequency;
- braking means for braking said disk driving means to decrease the speed of rotation of said disk;
- time detecting means for operating said braking means after said synchronization detecting means detects the synchronization of said detection signal, and for detecting a period of time which lapses from the time instant said braking means is operated until said detecting means detects when said frequency of said detection signal is shifted at least said predetermined value from said predetermined frequency;
- determining means for determining a diameter of said disk from said period of time detected by said time detecting means.
- 2. A disk player as claimed in claim 1, wherein said disk player contains a plurality of disks in which said data signals have been stored in one and the same format.
- 3. A disk player as claimed in claim 1, wherein said disk player contains a 12 cm. disk and a 8 cm. disk.
- 4. A disk player as claimed in claim 1, wherein said shift detecting means changes a sense signal when a frequency of said detection signal outputted by said detecting means is shifted at least a predetermined value from said predetermined frequency.
- 5. A disk player comprising:
- disk driving means for driving a disk;
- detecting means for reading a data signal from said disk;
- synchronization detecting means for detecting when a frequency of a detection signal is synchronized with a predetermined frequency which permits reproduction of said data signal, said detection signal being outputted when the data signal is detected from said detecting means;
- shift detecting means for detecting when a frequency of said detection signal outputted by said detecting means is shifted at least a predetermined value from said predetermined frequency to change a sense signal;
- braking means for braking said disk driving means to decrease the speed of rotation of said disk;
- time detecting means for operating said braking means after said synchronization detecting means detects the synchronization of said detection signal, and for detecting a period of time which lapses from the time instant said braking means is operated until said shift detecting means changes said sense signal; and
- determining means for determining a diameter of said disk from said period of time detected by said time detecting means.
- 6. A method for determining a diameter of a disk comprising steps of:
- driving said disk;
- reading a data signal from said disk;
- detecting when a frequency of a detection signal is synchronized with a predetermined frequency which permits reproduction of said data signal, said detection signal being outputted when the data signal is detected;
- braking said disk driving to decrease the speed of rotation of said disk after said detecting detects the synchronization of said detection signal;
- detecting a period of time which lapses from the time instant said braking is operated until when said frequency of said detection signal is shifted at least a predetermined value from said predetermined frequency; and
- determining a diameter of said disk from said period of time detected by said detecting.
Priority Claims (1)
Number |
Date |
Country |
Kind |
4-052315 U |
Jul 1992 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 08/096,069 filed Jul. 22, 1993, now abandoned.
US Referenced Citations (3)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2113848 |
Sep 1990 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
96069 |
Jul 1993 |
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