Recording/reproducing device
First Claim
1. A recording/reproducing device that performs recording onto and reproduction from a recording medium that includes an information recording area wherein information is recorded and a table of contents area wherein additional information concerning the information recorded in the information recording area is recorded, the recording medium being provided with guiding grooves that snake in cycles corresponding to absolute addresses, comprising:
- recording means for recording information in the information recording area and for recording the absolute addresses indicating a position of the information recording area with respect to a reference velocity of the recording medium as additional information in the table of contents area;
speed changing means for changing a velocity of the recording medium according to a sampling frequency of the information being recorded or reproduced from the information recording area;
a demodulator for obtaining the absolute addresses through demodulation by comparing frequencies obtained from the snaking cycles of the guiding grooves with a reference frequency;
demodulator adjusting means, operatively connected to said demodulator, for changing said reference frequency of said demodulator in accordance with said sampling frequency of each information being recorded or reproduced; and
operational means, operatively connected to said demodulator, for adjusting the demodulated absolute addresses, according to said velocity of the recording medium, to produce corrected absolute addresses, said corrected absolute addresses corresponding to a period of time which has elapsed since a starting time of a recording or reproducing operation, said velocity of the recording medium corresponding to said sampling frequency of the information being recorded or reproduced.
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Accused Products
Abstract
A recording/reproducing device performs the recording/reproduction on a recording medium having an information recording area and a table of contents area. The recording medium is provided with guiding grooves that snake in cycles corresponding to values of absolute addresses. The device divides the information recording area into a plurality of domains. Each domain corresponds to a single sampling frequency with respect to the information being recorded. An electromagnet and an optical head record information in the domain that corresponds to its sampling frequency and records additional information concerning the division in the table of contents. A spindle motor drives the disk which is adjusted such that the velocity of the disk is changed for each domain during recording and reproduction. A demodulator obtains the absolute addresses through demodulation by comparing frequencies determined from the snaking cycles of the guiding grooves with a reference frequency. An operational circuit converts the demodulated absolute addresses in accordance with the velocity of the disk into corrected absolute addresses that represented the period of time which has elapsed since the starting time. As a result, the burden imposed on the spindle motor is relieved, the demodulation of the absolute addresses may be executed accurately even when the rotational speed of the disk varies, and the time elapsed since the start of the recording/reproduction may be determined.
39 Citations
45 Claims
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1. A recording/reproducing device that performs recording onto and reproduction from a recording medium that includes an information recording area wherein information is recorded and a table of contents area wherein additional information concerning the information recorded in the information recording area is recorded, the recording medium being provided with guiding grooves that snake in cycles corresponding to absolute addresses, comprising:
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recording means for recording information in the information recording area and for recording the absolute addresses indicating a position of the information recording area with respect to a reference velocity of the recording medium as additional information in the table of contents area; speed changing means for changing a velocity of the recording medium according to a sampling frequency of the information being recorded or reproduced from the information recording area; a demodulator for obtaining the absolute addresses through demodulation by comparing frequencies obtained from the snaking cycles of the guiding grooves with a reference frequency; demodulator adjusting means, operatively connected to said demodulator, for changing said reference frequency of said demodulator in accordance with said sampling frequency of each information being recorded or reproduced; and operational means, operatively connected to said demodulator, for adjusting the demodulated absolute addresses, according to said velocity of the recording medium, to produce corrected absolute addresses, said corrected absolute addresses corresponding to a period of time which has elapsed since a starting time of a recording or reproducing operation, said velocity of the recording medium corresponding to said sampling frequency of the information being recorded or reproduced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 32, 33, 34, 35, 36)
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17. A recording/reproducing device that performs a recording of information onto an unformatted recording medium that includes an information recording area wherein a plurality of pieces of information produced from mutually different sampling frequencies are recorded, and a table of contents area wherein additional information concerning the information recorded in the information recording area, comprising:
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division setting means for dividing the information recording area prior to the actual recording process into a plurality of domains, each domain having a distinct physical length corresponding to a sampling frequency associated with the information being recorded and for producing additional information representing the length established by the division process; recording means for determining said sampling frequency of the information being recorded, for recording information only in said domains that said division setting means has established as corresponding to said sampling frequency of the information, and for recording said additional information representing the division in the table of contents area; driving means for driving the recording medium at a constant linear velocity during recording and reproduction; and speed changing means for adjusting said driving means such that the constant linear velocity of the recording medium is charged for each domain when recording or reproducing information. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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Specification