Abstract: Provided is an orbiting memory capable of suppressing residual deviation even when a phase difference is caused between a signal to be compensated and information stored in a memory to be fed back and a disc device using the orbiting memory. The disc device includes: an adder to which a signal (s10) to be compensated and having a cyclic frequency component such as a control system error signal is inputted; and a feed back signal system for successively updating and storing an output signal of the adder for each cycle in a memory and inputting one-cycle information stored in the memory to the adder.

Abstract: High bit-rate data and low bit-rate data for the same material are recorded in time division. Meanwhile, the recorded low bit-rate data is read out so as to be used for verification or time-shift playback. In a time-shift playback process, a plurality of tags, each tag containing low-resolution data, is read out at a time so that the read out low-resolution data are played back within excessive time generated by successively recording a plurality of cartons. For example, five cartons corresponding to an input video signal for 10 seconds are successively recorded. Within the resulting excessive time of 1.6 (=5×0.32) seconds, five tag are successively read out so as to play back the low-resolution data for the reproduction time of 10 seconds. The present invention is applicable to a disc recorder.

Abstract: A recording method, particularly suitable for use in a digital video-camera, is described according to which a digital signal (10), deriving from the encoding of an audio-video signal is temporarily stored in a buffer (11) and from there recorded in a dual layer DVD (12) in successive recording intervals (22) or packets. The start/stop of a recording interval is normally controlled according to the level (15) of filling of the buffer. The digital signal is partitioned in portions that need to be entirely recorded on one single layer, and this triggers the need for a layer jump independently from the level of filling of the buffer. In order to avoid starting a layer jump with the buffer already partly filled, and therefore having a short non-recording interval (23) when time is mostly needed for calibrations, it is proposed to adjust the resolution in the encoding of the audio-video signal so as to have the buffer close to empty when the layer jump occurs.

Abstract: An optical disc apparatus includes a pause circuit for pausing data encoders upon receiving a pause signal so that a write operation may be paused without writing dummy data, thereby maintaining data succession. The optical disc apparatus also includes a circuit for accurately determining a write start location by referring to previously written data. A processor generates a pause signal when the amount of data in the optical drive apparatus data buffer is low, and removes the pause signal when additional data from a host is received. The processor may also automatically reduce the write speed of the optical disc apparatus upon a pause condition, thereby preventing the necessity for excessive pausing.

Abstract: A method for transferring real time information on a record carrier, typically bitstream audio on an optical disc, which method comprises encoding consecutive segments of the real time information to compressed real time data in frames, and determining a buffer occupancy for at least one frame, which buffer occupancy is indicative of an amount of compressed real time data to be present in the playback buffer at the start of decoding said frame. A signal is transmitted carrying the compressed real time data and the buffer occupancy, which data are received, stored in a playback buffer and finally decoded. The retrieving and/or the decoding is controlled in dependence on said transferred buffer occupancy. A playback buffer can be used effectively without risk for underflow or overflow. Also a method for recording audio information on a record carrier, a recording device, a record carrier and a playback device are described.

Abstract: An information storage apparatus characterized in that provided with: a data writing unit that writes the data in a data-storable information recording medium; a control information writing unit that writes control information in a predetermined region of the information recording medium, the control information being related to the data-writing by said data writing unit; and a conditional control information writing unit that, while the data writing unit is writing the data in the information recording medium, if a predetermined condition is satisfied, writes the control information in the predetermined region of the information recording medium, the control information being related to the data-writing for the meantime by the data writing unit. If the predetermined condition is satisfied, the control information is written in the predetermined region of the information recording medium.

Abstract: A minimum buffer data amount and a minimum reproduction delay time are found from a line approximation graphic form approximating a media read line and used as a basis for determining whether or not data can be reproduced in a real-time manner from a recording medium at a requested reproduction rate. The media read line is a line expressing the change in cumulative amount of data read out from the recording medium. The minimum buffer data amount is the minimum of the amount of data stored in a buffer as data required in reproduction of the data in a real-time manner at the requested reproduction rate. The minimum reproduction delay time is the minimum of a reproduction delay time from the start of an operation to read out the data from the recording medium to the start of an operation to reproduce the data.

Abstract: An optical disc apparatus includes a pause circuit for pausing data encoders upon receiving a pause signal so that a write operation may be paused without writing dummy data, thereby maintaining data succession. The optical disc apparatus also includes a circuit for accurately determining a write start location by referring to previously written data. A processor generates a pause signal when the amount of data in the optical drive apparatus data buffer is low, and removes the pause signal when additional data from a host is received. The processor may also automatically reduce the write speed of the optical disc apparatus upon a pause condition, thereby preventing the necessity for excessive pausing.

Abstract: A controller for controlling interruptions and restarts when writing data to a recording medium by emitting a laser beam against the recording medium. The controller prevents buffer underrun errors. The laser beam is emitted at a high power level when writing data on the recording medium and at a low power read level when reading data from the medium. The writing of data is interrupted when there is a possibility of a buffer underrun error. When restarting data writing from where the interruption occurred, the laser beam is shifted from the read level to the write level before reaching the location at which the interruption occurred. This guarantees that the laser beam has the required power level when writing is restarted.

Abstract: An optical disk device record data on a recordable or rewritable optical disk. After a pause and a restart in the constant angular velocity (CAV) method occurs predetermined times due to a cause of a recording error such as a buffer underrun, the data-recording by the CAV method is, for the first time, switched to the data-recording by the constant linear velocity (CLV) method at a recording velocity equal to or less than a recording velocity just before the last pause so as to provide a recording density equal to said constant recording density when said pausing is performed.

Abstract: One embodiment of the present invention provides a system that facilitates code verification and garbage collection in a platform-independent virtual machine. The system operates by first receiving a code module written in a platform-independent language. Next, the system examines the code module to locate calls to program methods within the code module. The system then transforms the code module so that all operands remaining on the evaluation stack only relate to the called method when the method is called, thereby simplifying verification and garbage collection of the code module.

Abstract: The present invention discloses a control method of recording speed in an optical disc drive. Firstly it is determined whether the recording speed is higher than a data transfer rate from the host to the data buffer in the optical disc drive. If so, the recording speed is set to the data transfer rate and disc writing is continued with a constant linear velocity (CLV) mode.

Abstract: A method for replacing a defective block with a good block in an optical disk allows data recording operations to be effectively performed. The method temporarily stores data that would have otherwise been recorded in a defective area of an optical disc in a temporary buffer. The method then stores the data in the temporary buffer in a spare area of the optical disc after the normal data recording operation is completed, or if the amount of data in the buffer exceeds a predetermined memory capacity. The method can continuously and quickly perform a general data recording operation, effectively avoid a system load increase due to frequent track movements on an optical disc, and appropriately record real-time data without the loss of data.

Abstract: An information recording and reproducing apparatus (S) is provided with: a first reproducing device (11) for reproducing audio information from a first information record medium (DK), in which the audio information is recorded; a recording device (28) for recording the reproduced audio information into a second information record medium (HD); a second reproducing device (28) for reproducing the audio information recorded in the second information record medium; and a controlling device (6) for setting a recording speed when recording the audio information into the second information record medium and a reproducing speed when reproducing the audio information from the second information record medium such that the recording speed is equal to or higher than the reproducing speed, and controlling the second reproducing device and the recording device so as to perform reproducing the recorded audio information from the second information record medium at the set reproducing speed in parallel to recording the audi

Abstract: A disc burner and its control method applicable to high speed disc burner, to solve disc burning failure problem due to burning speed exceeding encoding speed. A buffer is inserted to store the encoded data in groups, and these data groups are used in sequence for disc burning purpose. Therefore, the waiting time of the writing laser is spread out and does not exceed the threshold waiting time, and there is no disc burning failure problem.

Abstract: An information recording apparatus include: a processing unit for processing recording information to be recorded and for generating processed information; a storage unit for temporarily storing the processed information; a recording unit for recording the processed information onto an information storage medium; a position storing unit for storing, at a time of interrupting recording of the processed information, an interruption storage position which is a storage position in the storage unit of the processed information corresponding to a timing at which interruption is instructed; an interrupting unit for interrupting recording of the processed information after storing the interruption storing position; and a restart unit for restarting the recording of the processed information based on the stored interruption storage position.

Abstract: The present invention aims to enable revision of additional information buried in contents data with less burden on hardware. For this purpose, a predetermined amount of inputted contents data is temporarily stored in buffer means, the additional information buried in the contents data being detected from the contents data temporarily stored in the buffer means, the contents of the detected additional information being estimated, the contents data being made to be recorded in a predetermined medium when estimated that the contents data can be recorded, and the contents data being made not to be recorded in the medium when estimated that the contents data must not be recorded. In addition, when estimated that revision of the additional information is necessary, the relevant part of data stored in the buffer means is revised while it is being stored in the buffer means.

Abstract: A method and an apparatus for providing digital quality transmission of audio and non-audio information using low cost components and arrangement. The present invention provides for the transmission of the audio and non-audio transmission by first converting the data to conform to the CD standard format and conditioning the converted signal to thereby generate a conditioned EFM signal. The conditioned EFM signal is used to frequency modulate a carrier. By converting the audio and non-audio information to conform to the CD standard format, the present method provides a low cost means of transmitting the data with error detection and correction. Another aspect of the present invention relates to embedding the non-audio information in the SUBCODE block of the data frame according to the CD standard. The non-audio information may be unrelated to the audio information, and the audio and non-audio information may be transmitted to separate devices.

Abstract: A data recorder for recording data that prevents buffer overrun errors emits a laser beam against a recording medium to record data. The data has a level that determines the power of the laser beam. When there is a possibility of a buffer overrun, data recording is interrupted. The interruption is carried out when the power of the laser beam is a low level. Data recording is restarted with the laser beam generated at the low level.

Abstract: A storage unit with shockproof function and accessing method thereof is provided. The storage unit includes a storage media, a speed sensing device or a vibration sensing device and a control unit. The storage unit is capable of operating in an environment with strong vibration and avoiding most read/write errors at a reduced production cost.

Abstract: An optical disk unit includes the following: a storage part temporarily storing data to be written to an optical disk; a processing part processing the data; an encoder part modulating and outputting the processed data; a writing control part controlling writing of the data to the optical disk; and a writing command part detecting an occurrence of a state of suspension of supply of the data to the storage part and providing an operation command to the writing control part in accordance with the detection result. In the case of suspending the writing of the data to the optical disk, the writing control part causes the processing and encoder parts to stop accessing the storage part by setting the processing and encoder parts in a wait state after the processing and encoder parts access the storage part, and causes the storing of the data in the storage part to be stopped.

Abstract: An optical recording system for burning an optical disc includes a housing, a laser pickup installed inside the housing for writing data onto the optical disc according to a write strategy and reading an RF signal from the optical disc, a laser drive connected to the laser pickup for controlling operations of the laser pickup, a read channel installed connected to the laser pickup for processing the RF signal received by the laser pickup, a jitter meter installed inside the housing connected to the read channel for generating delay signals according to the processed RF signal, and a digital signal processor connected to the laser drive and the jitter meter for receiving the delay signals, configuring the write strategy according to the delay signals, and controlling the laser drive to control the laser pickup to write data onto the optical disc according to the configured write strategy.

Abstract: A controller for a data recorder controls data recording to prevent buffer overrun errors. The data recorder emits a laser beam against a recording medium to record data. The data has a level that determines the power of the laser beam. When there is a possibility of a buffer overrun, the controller interrupts data recording. The controller interrupts data recording when the power of the laser beam is a low level and restarts data recording with the laser beam generated at the low level.

Abstract: A method and device for retrieving data in low-power is provided. More specifically, it relates to a method and device for minimizing power consumption while retrieving the continuous media data from a disk drive for the purpose of real-time playback. The data reproducing device reproduces multimedia data by a determined playback strategy after it computes power consumption values according to various playback strategies and retrieves data from a storage medium by a playback strategy having the least power consumption by means of comparing respective power consumption values.

Abstract: A data recording equipment that accurately restarts the writing of data to an optical disc after data recording is interrupted. The equipment interrupts recording when detecting an external shock or when predicting the occurrence of a buffer underrun error. The equipment includes a counter, which counts execution of recording data on the optical disc and generates a count value indicating the amount of data that is recorded, and a control unit, which is connected to the counter to hold the count value of the counter immediately before an interruption when the recording of data is interrupted. The unit re-irradiates a position on the optical disc, on which data prior to the data recorded immediately before the interruption is recorded. The init controls restart of the recording based on the held count value while recognizing the position of the data on the optical disc.

Abstract: When recording and reproduction are performed at the same time, if a system controller detects that an amount of data accumulated in a buffer memory exceeds a predetermined value, the system controller stops data reading from an optical disk temporarily and records data accumulated in the buffer memory continuously to the optical disk. Then, an image is prevented from becoming abnormal when a reproduction position catches up to a recording position. Further, a system controller monitors a zone in an optical disk, to which recording is performed and controls a motor at an appropriate revolution number for the recording to the zone. Further, reproduction is performed by maintaining the revolution number. Then, even if the recording position and the reproduction position belong to different zones in a recording medium, a transition time from recording to reproduction is prevented from becoming long.

Abstract: The present invention provides an audio data recording medium reproducer, wherein CPU 10 which writes audio data read by reader 11 into buffer memory 13 and buffer memory controller 21 which transfers the data to buffer memory 22 and inputs it into DAC 23 at a predetermined data rate are connected by a bus, and furthermore, CPU 20 for controlling a user interface is separately provided. Provision of a plurality of such simple controllers reduces costs to be lower than in the case of providing one high-performance controller. Furthermore, it also becomes possible to separately construct the respective functional parts as units.

Abstract: The present invention prevents data underruns within an internal buffer of an optical media recording device while improving a recording rate by dynamically determining a time period to delay transferring data from a computer system to an optical media recording device. The time delay period may be set when an indication to delay data transfer from a source to an optical media recorder is received because the internal buffer is unable to hold or to receive additional data. The time delay period may then be set to a time less than a total time to empty the internal buffer given the total capacity of the internal buffer and the data transfer rate of the optical media recording device. Other factors also may be considered, such as the size and time for a single write to the optical media recorder.

Abstract: At least two magnetic disk units are used as a primary storage unit and a secondary storage unit, and, when an information write request is received, received information is sequentially written into consecutive recording areas in the same recording track of the primary storage unit disregarding write control information included in the received information, and if all recording areas in one track have been exhausted, the writing is continued to recording areas in a recording track adjacent to the one track at the inside or outside thereof, and the received information including the control information is read from the primary storage unit and written into the secondary storage unit based on the control information when the primary storage unit does not perform processing in response to a write or read request.

Abstract: A media player permits multiple compressed media files to be concurrently stored in memory interval to the media player. By concurrently buffering more than one compressed media file at a time, any mechanical disturbance that occurs during the playing of a file or between files will not cause a cessation of audio. Further, skipping ahead or in reverse is advantageously expedited.

Abstract: An audio player permits compressed or uncompressed audio CDs to be played. The preferred player includes a spindle motor control that causes the CD to be spun at a constant linear velocity that is commensurate with the encoding rate of the file being played. In this manner, the data can be continuously pulled of the CD at just the right rate so that, after being decoded and decompressed, the data can be played. The player also dynamically adjusts its constant linear velocity to the encoding rate of the file being played to permit files on the same disc having different encoding rates to be played.

Abstract: A rotation control method controls rotation of a CAV system recording medium which has a plurality of zones divided in a radial direction thereof. The rotation control method detects a state within a memory which temporarily stores write data to be written on the recording medium and/or read data read from the recording medium, and switches and controls a rotational speed of the recording medium based on the detected state of the memory, depending on an area which is accessed of a plurality of areas of the recording medium dividing the recording medium in the radial direction thereof.

Abstract: The invention is an offset setting system for an optical reading/writing apparatus having an optical pickup head reading/writing digital data under a predetermined velocity on an optical storage media. The apparatus sets the offset including a plurality of buffer blocks when the pickup head crosses storage tracks each time on the media and stop on a target storage track. The offset is to steady the pickup head to read/write data on a target block of the target storage track. A buffer time estimating module estimates an average time for the pickup head crossing a buffer block under a predetermined velocity, defining as a buffer time. The buffer blocks setting module records a steady time for the pickup head steadying to read/write data on the target block, and sets the number of the buffer blocks by a predetermined setting process in the offset based on the buffer time and the steady time.

Abstract: A method and system for optimizing performance of a read buffer and a write buffer in a disc media having a feature requiring apparently simultaneous reading and writing. The method includes alternately writing data to the disc media from the write buffer during a write time tW and reading data from the disc media to the read buffer during a read time tR. The read time and the write time are generally separated by a jump time tJ. The write time is selectively controlled so that it is optimized in accordance with respect to the front end read speed, the decoding bit rate, the front end write speed of the recordable media device and the encoding bit rate.

Abstract: The invention provides an apparatus for reproducing a plurality of image data which has been recorded in a plurality of independent areas on a disk-shaped recording medium and specified so as to be reproduced in predetermined order, from the disk-shaped recording medium by using a pickup mechanism. The apparatus has a memory for storing the reproduced image data and a memory control unit for reading out the image data stored in the memory in the predetermined order, and controls whether the image data recorded in the plurality of areas is reproduced in order different from the predetermined order and written in the memory or not, on the basis of position information indicative of positions of the plurality of areas on the disk-shaped recording medium, a capacity of the memory, and a seeking time between the plurality of areas by the pickup mechanism.

Abstract: To resume data writing onto a disk, a recording start position detection means (19) detects a recording start position, and a synchronous setting means (20) synchronizes recording data with recorded data on a disk so that recording data successive to the recorded data on the disk can be additionally written onto the disk without a break. Data writing onto a disk is suspended until an amount of data equivalent to data writing capacity has been stored in the buffer memory (13). Data writing is resumed upon detection of the fact that an amount of data equivalent to data writing capacity has been stored in the buffer memory (13). With the above, power consumption can be reduced during a period when recording capability of a disk recording device exceeds the data transfer speed.

Abstract: A method for transferring real time information on a record carrier, typically bitstream audio on an optical disc, which method comprises encoding consecutive segments of the real time information to compressed real time data in frames, and determining a buffer occupancy for at least one frame, which buffer occupancy is indicative of an amount of compressed real time data to be present in the playback buffer at the start of decoding said frame. A signal is transmitted carrying the compressed real time data and the buffer occupancy, which data are received, stored in a playback buffer and finally decoded. The retrieving and/or the decoding is controlled in dependence on said transferred buffer occupancy. A playback buffer can be used effectively without risk for underflow or overflow. Also a method for recording audio information on a record carrier, a recording device, a record carrier and a playback device are described.

Abstract: A data recording speed control apparatus and method for recording a data on an optical recording medium are disclosed.

Abstract: A method and apparatus for playing compressed audio compact discs in a CD player is provided in which compressed audio data is cached in the local memory of the CD player. If a sufficient amount of compressed audio data is cached in the local memory of the CD player, the CD player can be placed in a reduced power state, reducing the consumption of power by the loader of the CD player. The determination of whether a sufficient amount of compressed audio data is present in the local memory of the CD player is made on the basis of a comparison of the playback time of the unaccessed cached audio and the restart time of the CD player.

Abstract: A method for adjusting the write speed of a data recording device and apparatus thereof. First, the recording media is written to at a write speed, during which the number of buffer underrun events is counted. Then, the write speed is adjusted according to the number of buffer underrun events until writing is finished.

Abstract: A buffer underrun is generated intentionally, and the apparent recording speed is changed by alternately repeating start and stop of recording by using the buffer underrun free recording function to obtain a desired recording speed.

Abstract: An information recording and reproducing system comprises a host device, and an information recording and reproducing device connected with the host device via a host interface. The host device includes a control-command issuing unit issuing a control command to the information recording and reproducing device. The control command causes a data-recording interrupting-resuming unit of the information recording and reproducing device either or not to perform the interruption and resumption of the recording. The information recording and reproducing device includes a data-recording interruption-resumption control unit controlling the data-recording interrupting-resuming unit either or not to perform the interruption and resumption of the recording, according to the control command received from the host device.

Abstract: An optical disc apparatus includes a pause circuit for pausing data encoders upon receiving a pause signal so that a write operation may be paused without writing dummy data, thereby maintaining data succession. The optical disc apparatus also includes a circuit for accurately determining a write start location by referring to previously written data. A processor generates a pause signal when the amount of data in the optical drive apparatus data buffer is low, and removes the pause signal when additional data from a host is received. The processor may also automatically reduce the write speed of the optical disc apparatus upon a pause condition, thereby preventing the necessity for excessive pausing.

Abstract: An optical drive that detects a communication link interface speed to a host device and changes an optical media writing speed to reduce the likelihood that an error will occur during writing caused by an insufficient data interface rate in relation to the writing speed. In certain embodiments, the process for detecting and storing the preferred recording speed may be a software module which is part of the firmware of the optical drive. The invention provides a method of determining the preferred recording speed based on the interface speed and the maximum recording speed of the optical drive and storing this preferred recording speed for retrieval during recording of optical media.

Abstract: A method used in a CD-R/W drive for coordinating the writing and reading speeds of a CD-R/W drive is disclosed. With the aid of the method, the writing speed of the CD-R/W drive is able to be adjusted, and thus a more stable writing operation is obtained. In the method, if the time(s) that the buffer has been cleaned up is/are not larger than the predetermined value, the CD-R/W drive will write data to the CD-ROM at its highest speed. On the contrary, if the time(s) that the buffer has been cleaned up is/are larger than the predetermined value, the CD-R/W drive will slow down stepwise from the current speed to a lower speed. To accomplish the invention, the CD-R/W drive is either controlled by computer programs or by a programmably pre-written control chip that is installed in a control circuit inside the CD-R/W drive itself.

Abstract: The optical disk player is capable of correctly restarting to write data. Data protection means returns an optical pick-up from an interruption address to a synchronization starting address. The data protection means reads data from the synchronization starting address to the interruption address at a reading velocity equal to a former writing velocity. The data protection means restarts writing data from the interruption address if a phase of data read is synchronized with a phase of data to be written. The data protection means returns the optical pick-up to the synchronization starting address and reads data from there to the interruption address at a reading velocity slower than the former writing velocity so as to synchronize the phases if the synchronization is failed.

Abstract: Disclosed is a data recording method for an optical disc driver comprising the steps of receiving a data recording command, encoding data to be recorded in a corresponding user region block, storing the encoded data in the unit of an error correction code (ECC) block in a buffer, and recording the data of the ECC blocks if the number of the ECC blocks stored in the buffer is larger than the predetermined number of the ECC blocks. In encoding the data to be recorded, if the data to be recorded is the data in the unit of a sector, the data of the ECC block of the user region corresponding to the sector is reproduced, the data to be newly recorded is inserted into the data of the reproduced ECC block, and the processed ECC block is encoded. If the data to be recorded is the data in the unit of an ECC block, the ECC block data of the user region is not reproduced, but the ECC block to be recorded is encoded.

Abstract: An object of this invention is to provide a recording apparatus, reproducing apparatus, recording method and reproducing method for recording or reproducing data in/from a recording medium while the recording medium is rotating by inertia after a rotation thereof by driving is stopped.

Abstract: High bit-rate data and low bit-rate data for the same material are recorded in time division. Meanwhile, the recorded low bit-rate data is read out so as to be used for verification or time-shift playback. In a time-shift playback process, a plurality of tags, each containing low resolution data, are read out at a time so that the read out low resolution data are played back within excessive time generated by successively recording a plurality of cartons. For example, five cartons corresponding to an input video signal for 10 seconds are successively recorded. Within the resulting excessive time of 1.6 (=5×0.32) seconds, five tag are successively read out so as to play back the low resolution data for reproduction time of 10 seconds. The present invention is applicable to a disc recorder.

Abstract: A reproducing apparatus for reading, or a recording apparatus for writing, data from or to a disc having pre-formed thereon a pair of concentrical or spiral tracks adjacent to each other and to which a common address is given, is adapted to control the time at which a read or write head is moved from one to the other of the pair of tracks or vice versa.