EP0399852A2
Expired / Lapsed
EP
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Recording/reproducing device
Assignee: Sharp Corp
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Filing: 1990-05-25
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Granted: —
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Expires: 2010-05-25
Abstract
Abstract A recording/reproducing device that performs the recording/reproduction on a writable disk comprising an information recording area and a TOC area, and provided with guiding grooves that snake with cycles corresponding to the values of absolute addresses, comprises division setting means for dividing according to an external setting and to a set capacity ratio, the information recording area into a plurality of domains respectively corresponding to each sampling frequency of information to be recorded, and for producing additional information that indicates the details of the division, an electromagnet and an optical head for recording each information in the domain of the information recording area that corresponds to its sampling frequency and for recording the additional information including the details of the division in the TOC area, a spindle motor that drives the disk, speed changing means for adjusting the speed of the spindle motor such that the velocity of the disk is changed in each domain during recording and reproduction, a demodulator where the absolute addresses are obtained through demodulation by comparing frequencies determined from the snaking cycles of the guiding grooves with a reference frequency, changeover switches that change the reference voltage of the demodulator in accordance with the sampling frequency of each information, and an operational circuit that converts the demodulated absolute addresses in accordance with the velocity of the disk and determines corrected absolute addresses that correspond to the time elapsed when taking the recording/reproduction starting time as reference. 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.
Inventors
- 👤 Shigeo Terashima
- 👤 Toshihisa Deguchi
- 👤 Kunio Kojima
- 👤 Shigemi Maeda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 10:35
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/02; G11B20/08; G11B20/10; G11B11/00; G11B11/10; G11B11/105; G11B11/1055; G11B11/10556; G11B11/10563; G11B11/10595; G11B19/00; G11B19/20; G11B19/28; G11B27/00; G11B27/02; G11B27/031; G11B27/034; G11B27/10; G11B27/19; G11B27/28; G11B27/32; G11B27/327; G11B27/329; G11B20/12; G11B20/1217; G11B20/1258; G11B2220/00; G11B2220/20; G11B2220/25; G11B2220/2525
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
213 words
A recording/reproducing device that performs recording on and reproduction from a writable recording medium that comprises an information recording area wherein information received from outside is recorded and a TOC area wherein additional information concerning the information recorded in said information recording area is recorded, and that is provided with guiding grooves that snake in cycles corresponding to absolute addresses, comprising: recording means for recording information in said information recording area, and for recording said absolute addresses indicating at least the position where said information is recorded, as additional information in said TOC area; speed changing means for changing the velocity of said recording medium according to the sampling frequency of each information being recorded and reproduced in said information recording area; a demodulator where said absolute addresses are obtained through demodulation by comparing frequencies obtained through the snaking cycles of said guiding grooves with a reference frequency; demodulator adjusting means for changing the reference frequency of said demodulator in accordance with the sampling frequency of each information; and operational means for converting said absolute addresses after said absolute addresses were demodulated in said demodulator, according to the velocity of said recording medium, and for determining corrected absolute addresses that correspond to the time elapsed when taking the recording/reproduction starting time as reference.
Claim 2
Dependent Claim
213 words
A recording/reproducing device that performs recording on and reproduction from a writable recording medium that comprises an information recording area wherein information received from outside is recorded and a TOC area wherein additional information concerning the information recorded in said information recording area is recorded, and that is provided with guiding grooves that snake in cycles corresponding to absolute addresses, comprising: recording means for recording information in said information recording area, and for recording said absolute addresses indicating at least the position where said information is recorded, as additional information in said TOC area; speed changing means for changing the velocity of said recording medium according to the sampling frequency of each information being recorded and reproduced in said information recording area; a demodulator where said absolute addresses are obtained through demodulation by comparing frequencies obtained through the snaking cycles of said guiding grooves with a reference frequency; demodulator adjusting means for changing the reference frequency of said demodulator in accordance with the sampling frequency of each information; and operational means for converting said absolute addresses after said absolute addresses were demodulated in said demodulator, according to the velocity of said recording medium, and for determining corrected absolute addresses that correspond to the time elapsed when taking the recording/reproduction starting time as reference.
Claim 3
Dependent Claim
35 words
A recording/reproducing device as defined in claim 1 further arranged such that each time an information is recorded in said information recording area, an additional information concerning said information is recorded in said TOC area.
Claim 4
Dependent Claim
17 words
A recording/reproducing device as defined in claim 1, wherein said writable recording medium includes an optical card.
Claim 5
Dependent Claim
29 words
A recording/reproducing device as defined in claim 1, wherein said writable recording medium includes a magneto-optical disk whereon information is recorded, reproduced and erased information using a magneto-optical effect.
Claim 6
Dependent Claim
44 words
A recording/reproducing device as defined in claim 4, wherein said recording means comprises an optical head that projects a laser beam on said magneto-optical disk, and an electromagnet for applying an external magnetic field on said magneto-optical disk in accordance with a recording signal.
Claim 7
Dependent Claim
29 words
A recording/reproducing device as defined in claim 1, wherein said writable recording medium includes a rewritable disk whereon information is recorded, reproduced and erased using a phase transition effect.
Claim 8
Dependent Claim
27 words
A recording/reproducing device as defined in claim 1, wherein said writable recording medium includes a Direct Read after Write type disk whereon information is recorded only once.
Claim 9
Dependent Claim
32 words
A recording/reproducing device as defined in claim 6 or claim 7, wherein said recording means comprises an optical head that records and/or reproduces information by projecting a laser beam on said disk.
Claim 10
Dependent Claim
33 words
A recording/reproducing device as defined in claim 4, claim 6 or claim 7, wherein the rotation of said disk is controlled such that the recording/reproduction of information is performed in constant linear velocity.
Claim 11
Dependent Claim
33 words
A recording/reproducing device as defined in claim 4, claim 6 or claim 7, wherein the rotation of said disk is controlled such that the recording/reproduction of information is performed in constant angular velocity.
Claim 12
Dependent Claim
23 words
A recording/reproducing device as defined in claim 1, wherein said speed changing means is composed of a microcomputer that controls the entire device.
Claim 13
Dependent Claim
110 words
A recording/reproducing device as defined in claim 1, wherein said demodulator comprises: a phase-locked loop composed of a phase comparator that compares the frequencies of two signals that were entered therein and releases a signal in accordance with the difference of said frequencies, a first low-pass filter that cuts off high frequency components contained in a signal received from said phase comparator, and a plurality of voltage controlled oscillators that release and send to said phase comparator a signal having a frequency in accordance with the size of a signal received from said first low-pass filter; and a second low-pass filter juxtaposed to and connected with said first low-pass filter.
Claim 14
Dependent Claim
39 words
A recording/reproducing device as defined in claim 12, wherein said demodulator adjusting means is composed of changeover switches that switch from one of said voltage controlled oscillators to another for each sampling frequency used in information to be recorded.
Claim 15
Dependent Claim
140 words
A recording/reproducing device as defined in claim 1 wherein said demodulator comprises: a phase-locked loop composed of a phase comparator that compares the frequencies of two signals that were entered therein and releases a signal in accordance with the difference of said frequencies, a first low-pass filter that cuts off high frequency components contained in a signal received from said phase comparator, a voltage controlled oscillator that releases a signal having a frequency in accordance with the size of a signal received from said first low-pass filter, and a plurality of frequency dividers having mutually different division ratios and that release and send to said phase comparator a signal having a frequency in accordance with the frequency of a signal received from said voltage controlled oscillator; and a second low-pass filter juxtaposed to and connected with said first low-pass filter.
Claim 16
Dependent Claim
38 words
A recording/reproducing device as defined in claim 14, wherein said demodulator adjusting means is composed of changeover switches that switch from one of said frequency dividers to another for each sampling frequency used in information to be recorded.
Claim 17
Dependent Claim
34 words
A recording/reproducing device as defined in claim 1, wherein said operational means is composed of an address operational circuit where the values of said absolute addresses are converted into values of corrected absolute addresses.
Claim 18
Dependent Claim
224 words
A recording/reproducing device that performs the recording/reproduction of information on a writable recording medium that comprises an information recording area wherein a plurality of pieces of information produced in mutually different sampling frequencies are recorded, and a TOC area wherein additional information concerning the information recorded in said information recording area, comprising: division setting means for dividing according to an external setting and to a set capacity ratio, said information recording area into a plurality of domains respectively corresponding to each sampling frequency of information to be recorded, and for producing additional information that indicates the details of the division; recording means for determining the sampling frequency of the information to be recorded, for recording each information in the domain among said domains of said information recording area that corresponds to the sampling frequency of said information, and for recording said additional information that includes the details of the division in said TOC area; reproducing means for reproducing the information recorded in said information recording area and said additional information recorded in said TOC area; driving means for driving said recording medium during recording and reproduction; and speed changing means for adjusting the speed of said driving means such that the velocity of said recording medium is changed in each of said domains when recording and reproduction are performed in said information recording area.
Claim 19
Dependent Claim
224 words
A recording/reproducing device that performs the recording/reproduction of information on a writable recording medium that comprises an information recording area wherein a plurality of pieces of information produced in mutually different sampling frequencies are recorded, and a TOC area wherein additional information concerning the information recorded in said information recording area, comprising: division setting means for dividing according to an external setting and to a set capacity ratio, said information recording area into a plurality of domains respectively corresponding to each sampling frequency of information to be recorded, and for producing additional information that indicates the details of the division; recording means for determining the sampling frequency of the information to be recorded, for recording each information in the domain among said domains of said information recording area that corresponds to the sampling frequency of said information, and for recording said additional information that includes the details of the division in said TOC area; reproducing means for reproducing the information recorded in said information recording area and said additional information recorded in said TOC area; driving means for driving said recording medium during recording and reproduction; and speed changing means for adjusting the speed of said driving means such that the velocity of said recording medium is changed in each of said domains when recording and reproduction are performed in said information recording area.
Claim 20
Dependent Claim
35 words
A recording/reproducing device as defined in claim 17 further arranged such that each time an information is recorded in said information recording area, an additional information concerning said information is recorded in said TOC area.
Claim 21
Dependent Claim
28 words
A recording/reproducing device as defined in claim 17, wherein said recording medium is provided with guiding grooves that snake with cycles corresponding to the values of absolute addresses.
Claim 22
Dependent Claim
19 words
A recording/reproducing device as defined in claim 17, wherein said recording medium comprises absolute addresses indicated by mechanical pits.
Claim 23
Dependent Claim
27 words
A recording/reproducing device as defined in claim 17, wherein said division setting means and speed changing means are composed by a microcomputer that controls the entire device.
Claim 24
Dependent Claim
17 words
A recording/reproducing device as defined in claim 17, wherein said writable recording medium includes an optical card.
Claim 25
Dependent Claim
28 words
A recording/reproducing device as defined in claim 17, wherein said writable recording medium includes a magneto-optical disk whereon information is recorded, reproduced and erased using a magneto-optical effect.
Claim 26
Dependent Claim
44 words
A recording/reproducing device as defined in claim 23, wherein said recording means comprises an optical head that projects a laser beam on said magneto-optical disk, and an electromagnet for applying an external magnetic field on said magneto-optical disk in accordance with a recording signal.
Claim 27
Dependent Claim
30 words
A recording/reproducing device as defined in claim 17 wherein, said writable recording medium includes a rewritable disk wherein information is recorded, reproduced and erased information using a phase transition effect.
Claim 28
Dependent Claim
27 words
A recording/reproducing device as defined in claim 17, wherein said writable recording medium includes a Direct Read after Write type disk whereon information is recorded only once.
Claim 29
Dependent Claim
36 words
A recording/reproducing device as defined in claim 25 or claim 26, wherein said recording means and said reproducing means comprise an optical head that records and/or reproduces information by projecting a laser beam on said disk.
Claim 30
Dependent Claim
21 words
A recording/reproducing device as defined in claim 23, claim 25 or claim 26, wherein said driving means is a spindle motor.
Claim 31
Dependent Claim
33 words
A recording/reproducing device as defined in claim 23, claim 25 or claim 26, wherein the rotation of said disk is controlled such that the recording/reproduction of information is performed in constant linear velocity.
Claim 32
Dependent Claim
33 words
A recording/reproducing device as defined in claim 23, claim 25 or claim 26, wherein the rotation of said disk is controlled such that the recording/reproduction of information is performed in constant angular velocity.
Claim 33
Dependent Claim
45 words
A recording/reproducing device as defined in claim 23, claim 25 or claim 26, wherein said division setting means further executes the division of said information recording area such that the higher the sampling frequency is, the outer on said disk said corresponding domain is located.
Claim 34
Dependent Claim
103 words
Apparatus for recording/reproducing information on and from a recording medium which has an information recording area for the information itself, and an address data area for address data identifying the locations of information portions in said information recording area, the apparatus having a drive means for driving the recording medium at a speed parameter which is variable in accordance with the sampling frequency of the information being recorded or reproduced wherein means for obtaining the address data signals from a readout signal produced by reading the address data includes means for compensating the address data signal frequency in accordance with the speed parameter.
Claim 35
Dependent Claim
103 words
Apparatus for recording/reproducing information on and from a recording medium which has an information recording area for the information itself, and an address data area for address data identifying the locations of information portions in said information recording area, the apparatus having a drive means for driving the recording medium at a speed parameter which is variable in accordance with the sampling frequency of the information being recorded or reproduced wherein means for obtaining the address data signals from a readout signal produced by reading the address data includes means for compensating the address data signal frequency in accordance with the speed parameter.
Claim 36
Dependent Claim
93 words
Apparatus for recording/reproducing information on and from a recording medium which has an information recording area for the information itself, and an address data area for address data identifying the locations of information portions in said information recording area, the apparatus having a drive means for driving the recording medium at a speed parameter which is variable in accordance with the sampling frequency of the information being recorded or reproduced, wherein the apparatus is adapted to record information of different said sampling frequencies in respective different assigned parts of said information recording area.
Claim 37
Dependent Claim
93 words
Apparatus for recording/reproducing information on and from a recording medium which has an information recording area for the information itself, and an address data area for address data identifying the locations of information portions in said information recording area, the apparatus having a drive means for driving the recording medium at a speed parameter which is variable in accordance with the sampling frequency of the information being recorded or reproduced, wherein the apparatus is adapted to record information of different said sampling frequencies in respective different assigned parts of said information recording area.
References Cited (Backward Citations)
No citation records indexed.
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