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EP0620548A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Recording and/or reproducing apparatus and method of controlling same
Assignee: Sony Corp
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Filing: 1994-04-07
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Granted: —
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Expires: 2014-04-07
Abstract
Abstract A recording and/or reproducing apparatus for recording data on and/or reproducing data from a recording medium (1) includes a recording and/or reproducing unit (3,6), a memory (13), a memory controller (12), and a servo control circuit (9), and a system controller (11). The recording and/or reproducing unit (3,6) records data on the recording medium (1) and/or reproduces recorded data from the recording medium (1). The memory (13) temporarily stores data outputted from the recording and/or reproducing unit (3,6) or input data to be recorded on the recording medium (1) by the recording and/or reproducing unit (3,6). The memory controller (12) controls the memory (13) to write and read data such that data are read from the memory (13) in a unit of time at a transfer rate lower than the transfer rate at which data are written in the memory in a unit of time. The servo control circuit (9) supplies a servo control signal to the recording and/or reproducing means (3,6), and has an adjustable servo control gain. The system controller controls operation of the recording and/or reproducing unit (3,6), the memory controller (12), and the servo control circuit (9). The input data are recorded on the recording medium (1) through the memory (13) and the data reproduced from the recording medium (1) are outputted through the memory (13). The system controller (11) temporarily interrupts the recording of data on the recording medium (1) or the reproducing of data from the recording medium (1) with the recording and/or reproducing unit based on the amount of data stored in the memory (13), and controls the servo control circuit (9) and the recording and/or reproducing unit (3,6) to automatically adjust the servo control gain while the recording or reproducing of data is temporarily interrupted.
Inventors
- 👤 Yoshio C/O Sony Corporation Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 16:21
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/0941; G11B7/0946; G11B7/0948
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
344 words
A recording and/or reproducing apparatus for recording data on and/or reproducing data from a recording medium (1), said apparatus comprising: recording and/or reproducing means (3,6) movable relatively to the recording medium (1), for recording data on the recording medium (1) and/or reproducing recorded data from the recording medium (1); a memory (13) for temporarily storing data outputted from said recording and/or reproducing means (3,6) or input data to be recorded on the recording medium (1); memory control means (12) for controlling said memory (13) to write and read data such that the data outputted from said recording and/or reproducing means (3,6) are written in said memory (13) or the input data to be recorded on the recording medium (1) which are temporarily stored in said memory (13) are read from said memory (13) at a transfer rate higher than the transfer rate at which the data outputted from said recording and/or reproducing means (3,6) which are temporarily stored in said memory (13) are read from said memory (13) or the input data to be recorded on the recording medium (1) are written in said memory (13); servo control means (9) for generating a servo control signal based on an error signal (TE) generated based on the data outputted from said recording and/or reproducing means (3,6), and supplying the generated servo control signal to said recording and/or reproducing means (3,6), said servo control means (9) having an adjustable servo control gain; and system control means (11) for controlling operation of said recording and/or reproducing means (3,6), said memory control means (12), and said servo control means (9), said system control means (11) comprising means for controlling said recording and/or reproducing means (3,6) to intermittently record data on the recording medium (1) or reproduce recorded data from the recording medium (1) based on the amount of data stored in said memory (13), and means for controlling said servo control means to automatically adjust the servo control gain thereof while the operation of said recording and/or reproducing means (3,6) to record or reproduce data is being interrupted.
Claim 2
Dependent Claim
344 words
A recording and/or reproducing apparatus for recording data on and/or reproducing data from a recording medium (1), said apparatus comprising: recording and/or reproducing means (3,6) movable relatively to the recording medium (1), for recording data on the recording medium (1) and/or reproducing recorded data from the recording medium (1); a memory (13) for temporarily storing data outputted from said recording and/or reproducing means (3,6) or input data to be recorded on the recording medium (1); memory control means (12) for controlling said memory (13) to write and read data such that the data outputted from said recording and/or reproducing means (3,6) are written in said memory (13) or the input data to be recorded on the recording medium (1) which are temporarily stored in said memory (13) are read from said memory (13) at a transfer rate higher than the transfer rate at which the data outputted from said recording and/or reproducing means (3,6) which are temporarily stored in said memory (13) are read from said memory (13) or the input data to be recorded on the recording medium (1) are written in said memory (13); servo control means (9) for generating a servo control signal based on an error signal (TE) generated based on the data outputted from said recording and/or reproducing means (3,6), and supplying the generated servo control signal to said recording and/or reproducing means (3,6), said servo control means (9) having an adjustable servo control gain; and system control means (11) for controlling operation of said recording and/or reproducing means (3,6), said memory control means (12), and said servo control means (9), said system control means (11) comprising means for controlling said recording and/or reproducing means (3,6) to intermittently record data on the recording medium (1) or reproduce recorded data from the recording medium (1) based on the amount of data stored in said memory (13), and means for controlling said servo control means to automatically adjust the servo control gain thereof while the operation of said recording and/or reproducing means (3,6) to record or reproduce data is being interrupted.
Claim 3
Dependent Claim
142 words
A recording and/or reproducing apparatus according to claim 1, wherein said servo control means (9) comprises an A/D converter (61) for converting said error signal (TE) into a digital signal, a reference signal generator (70) for generating a reference signal for adjusting the servo control gain, an adder (62) for adding the digital signal outputted from said A/D converter (61) and the reference signal generated by said reference signal generator (70), an extractor for extracting a gain adjusting signal component from the digital signal outputted from said A/D converter (61), a comparator (63) for comparing the reference signal generated by said reference signal generator (70) and the gain adjusting signal component extracted by said extractor, and a multiplier (64) for multiplying an output signal from said adder (62) by a coefficient determined based on the result of comparison by said comparator (63).
Claim 4
Dependent Claim
73 words
A recording and/or reproducing apparatus according to claim 1, said apparatus further comprises temperature (21) detecting means for detecting an ambient temperature, said system control means (11) comprises means for controlling said recording and/or reproducing means (3,6) and said servo control means (9) to automatically adjust the servo control gain of said servo control means (9) based on an output signal indicative of the detected ambient temperature from said temperature detecting means (21).
Claim 5
Dependent Claim
67 words
A recording and/or reproducing apparatus according to claim 1, wherein said system control (11) means comprises timer means (11 a) for measuring time, said system control means (11) comprising means for controlling said recording and/or reproducing means (3,6) and said servo control means (9) to automatically adjust the servo control gain of said servo control means (9) based on time information from said timer means (11 a).
Claim 6
Dependent Claim
56 words
A recording and/or reproducing apparatus according to claim 1, wherein said system control means (11) comprises means for controlling said recording and/or reproducing means (3,6) and said servo control means (9) to automatically adjust the servo control gain of said servo control means (9) based on address data outputted from said recording and/or reproducing means (3,6).
Claim 7
Dependent Claim
147 words
A recording and/or reproducing apparatus according to claim 1, wherein said servo control means (9) comprises an A/D converter (61;66) for converting said error signal into a digital signal, a memory (70) for storing a sine-wave signal as a reference for adjusting the servo control gain, an adder (62) for adding the digital signal outputted from said A/D converter (61;66) and the sine-wave signal from said memory (70), a filter (71;73) for extracting a gain adjusting sine-wave signal component from the digital signal outputted from said A/D converter (61;66), a comparator (63;74) for comparing the sine-wave signal from said memory (70) and the gain adjusting sine-wave signal component extracted by said filter (71;73), and a multiplier (64;69) for multiplying an output signal from said adder by a coefficient determined based on the result of comparison by said comparator (63;74) thereby to output a PWM servo control signal.
Claim 8
Dependent Claim
108 words
A recording and/or reproducing apparatus according to claim 1, wherein said recording and/or reproducing means (3,6) comprises an optical head (3) for applying a light beam to the recording medium (1) to record data on and reproduce data from the recording medium (1), further comprising temperature detecting means (21) for detecting a temperature near said optical head (3), said system control means (11) comprising means for controlling said recording and/or reproducing means (3,6) and said servo control means (9) to automatically adjust the servo control gain of said servo control means (9) based on an output signal indicative of the detected temperature from said temperature detecting means (21).
Claim 9
Dependent Claim
82 words
A recording and/or reproducing apparatus according to claim 1, wherein said system control means (11) includes timer means (11 a) for measuring time that has elapsed after a previous process of automatically adjusting the servo control gain was completed, said system control means (11) comprising means for controlling said recording and/or reproducing means (3,6) and said servo control means (9) to automatically adjust the servo control gain of said servo control means based on time information from said timer means (11 a).
Claim 10
Dependent Claim
75 words
A recording and/or reproducing apparatus according to claim 1, wherein said recording and/or reproducing means (3,6) comprises an address extractor (10) for extracting address data recorded on the recording medium (1), said system control means (11) comprising means for controlling said recording and/or reproducing means (3,6) and said servo control means (9) to automatically adjust the servo control gain of said servo control means (9) based on address data extracted by said address extractor (10).
Claim 11
Independent Claim
277 words
A method of controlling a recording and/or reproducing apparatus having a memory (13) for temporarily storing data outputted from recording and/or reproducing means (3,6) or input data to be recorded on a recording medium (1), and servo control means (9) for generating a servo control signal based on an error signal (TE;FE) generated based on the data outputted from the recording and/or reproducing means (3,6), and supplying the generated servo control signal to the recording and/or reproducing means (3,6), the servo control means (9) having an adjustable servo control gain, the arrangement being such that the memory (13) is controlled to write and read data such that the data outputted from said recording and/or reproducing means (3,6) are written in said memory (13) or the input data to be recorded on the recording medium (1) which are temporarily stored in said memory (13) are read from said memory (13) at a transfer rate higher than the transfer rate at which the data outputted from said recording and/or reproducing means (3,6) which are temporarily stored in said memory (13) are read from said memory (13) or the input data to be recorded on the recording medium (1) are written in said memory (13), said method comprising the steps of: controlling said recording and/or reproducing means (3,6) to intermittently record data on the recording medium (1) or reproduce recorded data from the recording medium (1) based on the amount of data stored in said memory (13); and controlling said servo control means (9) to automatically adjust the servo control gain thereof while the operation of said recording and/or reproducing means (3,6) to record or reproduce data is being interrupted.
Claim 12
Independent Claim
277 words
A method of controlling a recording and/or reproducing apparatus having a memory (13) for temporarily storing data outputted from recording and/or reproducing means (3,6) or input data to be recorded on a recording medium (1), and servo control means (9) for generating a servo control signal based on an error signal (TE;FE) generated based on the data outputted from the recording and/or reproducing means (3,6), and supplying the generated servo control signal to the recording and/or reproducing means (3,6), the servo control means (9) having an adjustable servo control gain, the arrangement being such that the memory (13) is controlled to write and read data such that the data outputted from said recording and/or reproducing means (3,6) are written in said memory (13) or the input data to be recorded on the recording medium (1) which are temporarily stored in said memory (13) are read from said memory (13) at a transfer rate higher than the transfer rate at which the data outputted from said recording and/or reproducing means (3,6) which are temporarily stored in said memory (13) are read from said memory (13) or the input data to be recorded on the recording medium (1) are written in said memory (13), said method comprising the steps of: controlling said recording and/or reproducing means (3,6) to intermittently record data on the recording medium (1) or reproduce recorded data from the recording medium (1) based on the amount of data stored in said memory (13); and controlling said servo control means (9) to automatically adjust the servo control gain thereof while the operation of said recording and/or reproducing means (3,6) to record or reproduce data is being interrupted.
Claim 13
Dependent Claim
93 words
A method according to claim 10, further comprising the steps of: extracting a gain adjusting signal component from a digital signal converted from the error signal which is generated based on the data outputted from said recording and/or reproducing means (3,6); comparing the extracted gain adjusting signal component and a reference sine-wave signal; and multiplying a signal indicative of the sum of said error signal and said reference sine-wave signal by a coefficient determined based on the result of comparison for automatically adjusting the servo control gain of the servo control means (9).
Claim 14
Dependent Claim
39 words
A method according to claim 10, further comprising the step of: automatically adjusting the servo control gain of the servo control means (9) based on a measured temperature near an optical head of the recording and/or reproducing means (3,6).
Claim 15
Dependent Claim
51 words
A method according to claim 10, further comprising the steps of: measuring time elapsed that has elapsed after a previous process of automatically adjusting the servo control gain was completed; and adjusting the servo control gain of the servo control means (9) when the measured time has reached a predetermined time.
Claim 16
Dependent Claim
42 words
A method according to claim 10, further comprising the steps of: automatically adjusting the servo control gain of the servo control means (9) based on address data recorded on the recording medium which are outputted from the recording and/or reproducing means (3,6).
Claim 17
Dependent Claim
279 words
A recording and/or reproducing apparatus comprising: recording and/or reproducing means (3,6) for recording data on a recording medium (1) and/or reproducing recorded data from the recording medium (1); memory means (13) for temporarily storing data outputted from said recording and/or reproducing means (3,6) or input data to be recorded on the recording medium (1) by said recording and/or reproducing means (3,6); memory control means (12) for controlling said memory (13) to write and read data such that data are read from said memory means (13) in a unit of time at a transfer rate lower than the transfer rate at which data are written in said memory means (13) in a unit of time; servo control means (9) for supplying a servo control signal to said recording and/or reproducing means (3,6), said servo control means (9) having an adjustable servo control gain; and system control means (11) for controlling operation of said recording and/or reproducing means (3,6), said memory control means (12), and said servo control means (9); wherein the input data are recorded on the recording medium (1) through said memory means (13) and the data reproduced from the recording medium (1) are outputted through said memory means (13); said system control means comprising means for temporarily interrupting the recording of data on the recording medium (1) or the reproducing of data from the recording medium (1) with said recording and/or reproducing means (3,6) based on the amount of data stored in said memory means (13), and controlling said servo control means (9) and said recording and/or reproducing means (3,6) to automatically adjust the servo control gain (9) while the recording or reproducing of data is temporarily interrupted.
Claim 18
Dependent Claim
279 words
A recording and/or reproducing apparatus comprising: recording and/or reproducing means (3,6) for recording data on a recording medium (1) and/or reproducing recorded data from the recording medium (1); memory means (13) for temporarily storing data outputted from said recording and/or reproducing means (3,6) or input data to be recorded on the recording medium (1) by said recording and/or reproducing means (3,6); memory control means (12) for controlling said memory (13) to write and read data such that data are read from said memory means (13) in a unit of time at a transfer rate lower than the transfer rate at which data are written in said memory means (13) in a unit of time; servo control means (9) for supplying a servo control signal to said recording and/or reproducing means (3,6), said servo control means (9) having an adjustable servo control gain; and system control means (11) for controlling operation of said recording and/or reproducing means (3,6), said memory control means (12), and said servo control means (9); wherein the input data are recorded on the recording medium (1) through said memory means (13) and the data reproduced from the recording medium (1) are outputted through said memory means (13); said system control means comprising means for temporarily interrupting the recording of data on the recording medium (1) or the reproducing of data from the recording medium (1) with said recording and/or reproducing means (3,6) based on the amount of data stored in said memory means (13), and controlling said servo control means (9) and said recording and/or reproducing means (3,6) to automatically adjust the servo control gain (9) while the recording or reproducing of data is temporarily interrupted.
Claim 19
Dependent Claim
145 words
A recording and/or reproducing apparatus according to claim 15, wherein said servo control means (9) comprises an A/D converter (61;66) for converting said error signal (TE;FE) into a digital signal, a waveform data generator (70) for outputting gain adjusting waveform data, an adder (62) for adding the digital signal outputted from said A/D converter (61;66) and the gain adjusting waveform data generated by said waveform data generator (70), a multiplier (64;69) for multiplying an output signal from said adder (62) by a predetermined coefficient to generate a servo control signal, a filter (71;73) for extracting the gain adjusting waveform data from the digital signal outputted from said A/D converter (61;66), and a comparator (63;74) for varying said coefficient based on the result of comparison between the gain adjusting waveform data generated by said waveform data generator (70) and an output signal from said filter (71;73).
Claim 20
Dependent Claim
66 words
A recording and/or reproducing apparatus according to claim 15, the apparatus further comprises temperature detecting means (21) for detecting an ambient temperature, said system control means (11) comprising means for controlling said servo control means (9) and said recording and/or reproducing means (3,6) to automatically adjust the servo control gain of said servo control means (9) based on temperature information from said temperature detecting means (21).
Claim 21
Dependent Claim
66 words
A recording and/or reproducing apparatus according to claim 15, wherein said system control means (11) includes timer means (11 a) for measuring time, said system control means (11) comprising means for controlling said servo control means and said recording and/or reproducing means (3,6) to automatically adjust the servo control gain of said servo control means (9) based on time information from said timer means (11 a).
Claim 22
Dependent Claim
61 words
A recording and/or reproducing apparatus according to claim 15, wherein said system control means (11) comprises means for controlling said servo control means (9) and said recording and/or reproducing means (3,6) to automatically adjust the servo control gain of said servo control means (9) based on address information extracted from the recording medium (1) by said recording and/or reproducing means (3,6).
References Cited (Backward Citations)
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