EP0283304A2
Expired / Lapsed
EP
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Optical disc reproduction apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1988-03-18
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Granted: —
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Expires: 2008-03-18
Abstract
Abstract The invention provides a novel optical disc reproduction apparatus capable of easily setting the input level of music signals recorded on an optical disc when recording those signals with a magnetic recording apparatus, in which the optical disc reproduction apparatus is provided with the peak-level coarse search mode and the peak-level fine search mode and allow the optical pickup to input music signal levels recorded on the disc while causing it to jump across a certain number of tracks, and then, the optical disc reproduction apparatus compares the input music signal level to the preceding signal level stored in memory means and stores the higher level in memory before again causing the optical pickup to jump itself across tracks followed by repeated comparison of the input signal levels, thus automatically detecting the position where the latest peak level is recorded.
Inventors
- 👤 Haruhisa Matsushita Elect. Ind. Co. Ltd. Tomoda
- 👤 Yasuomi Matsushita Elect. Ind. Co. Ltd. Shimada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 05:50
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/004; G11B7/005; G11B20/00; G11B20/10; G11B20/10009; G11B27/00; G11B27/02; G11B27/031; G11B27/034; G11B27/10; G11B27/11; G11B27/36; G11B2220/00; G11B2220/20; G11B2220/25; G11B2220/2537; G11B2220/2545; G11B2220/60; G11B2220/65
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
223 words
(1) An optical disc reproduction apparatus comprising; signal detector which detects music-playing time information and music signals recorded on the optical disc; signal output device which outputs those signals detected by said signal detector; signal-level input means which inputs music signal levels; peak-level memory which stores the peak level of music signals; peak-level position memory which stores the position at which the peak level signal is recorded; comparison means which executes comparison of the signal level stored in said peak-level memory with the signal level input by signal input means; renewal means which renews the value of peak-level memory and the value of peak-level position memory in accordance with the result of comparison executed by said comparison means; reference value memory which stores the predetermined reference values; peak-level-detecting operation unit which computes the peak-level fine-search starting position and the peak-level fine-search completing position for detecting more accurate peak-level position from the reference values stored in said reference value memory and the peak-level position stored in said peak-level position memory by activating peak-level coarse-search mode and also computes the peak-level pause position from the peak-level position detected by activating peak-level fine-search mode and also from the reference values stored in said reference-value memory; fine-search starting position memory which stores those values computed by said peak-level-detecting operation unit; fine-search completing position memory; and pause-position memory.
Claim 2
Dependent Claim
106 words
(2) The optical disc reproduction apparatus in accordance with Claim 1, wherein said predetermined reference values are substantially comprised of three kinds including reference value (a) which is used for determining said peak-level fine-search starting position by subtracting said reference value (a) from the peak-level position detected by activating said peak-level coarse-search mode, reference value (b) which is used for determining said peak-level fine-search completing position by adding said reference value (b) to said peak-level position, and reference value (c) which is used for determining said peak-level pause position by adding said reference value (c) to said peak-level position by activating said peak-level fine search mode.
Claim 3
Dependent Claim
37 words
(3) The optical disc reproduction apparatus in accordance with Claim 1, wherein said pause condition is entered at said peak-level pause position computed by said peak-level-detecting operation unit while said signal output device continuously outputs music signals.
Claim 4
Dependent Claim
40 words
(4) The optical disc reproduction apparatus in accordance with Claim 1, wherein said apparatus repeatedly plays back music signals for a specific diration corresponding to m-seconds (where m can optionally be set) before and after detecting a new peak level.
Claim 5
Dependent Claim
243 words
(5) An optical disc reproduction apparatus comprising; signal detector which detects music-playing time information and music signals recorded on the optical disc; signal output device which outputs those signals detected by said signal detector; signal-level input means which inputs music signal levels; peak-level memory which memorizes and stores the peak level of music signals; Peak-level position memory which memorizes and stores the position at which the peak level is recorded; comparison means which executes comparison of the signal level stored in said peak-level memory with the signal level input by said signal-level input means; renewal means which renews the value of peak-level memory and the value of peak-level position memory in accordance with the result of comparison executed by said comparison means; and control means which controls execution of peak-level coarse search mode detecting the peak level of music signals on the entire surface or in an optional region of the optical disc and the position at which said peak-level is recorded by executing repeated comparisons and renewals of the peak-levels of music signals using said signal-level input means, comparison means, and renewal means whenever the optical pickup jumps across several tracks covering the entire surface or an optional region, and also execution of peak-level fine search mode detecting more accurate peak-level position of music signals before and behind the position at which said detected peak-level is recorded in response to the result of detecting operations executed by said peak-level coarse search mode.
References Cited (Backward Citations)
No citation records indexed.
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