KR100189544B1 - Method and system for effective management of tapes using memory-in-cassettes - Google Patents

Abstract

In a cassette tape and a management method of a digital VCR system supporting MIC, a disc structure of an absolute track number is recorded in the MIC of the cassette tape of the digital VCR system in a pack structure for playback, searching, or recording of a cassette tape. Configured to be available for reformatting.

Description

Efficient Management Method and System of Tape Using Memory-In Cassette

1 is a block diagram of an SDVCR recorder circuit according to the present invention.

2 is a block diagram of an SDVCR regeneration system according to the present invention.

3 is an SDVCR recording data structure diagram according to the present invention.

4 is a memory configuration diagram of the MIC according to the present invention.

5 is a flowchart of blank area recording according to the present invention.

6 is a flowchart for reformatting a cassette tape according to the present invention.

The present invention relates to a data recording method and apparatus in a digital VCR system. In particular, the present invention provides a method of effectively using a memory in cassette (hereinafter referred to as a MIC) to prevent accidental recording by a user. The present invention relates to a method and system for efficiently managing a tape using a cassette, which is a memory capable of facilitating management of cassette tapes by facilitating continuous recording of absolute track numbers and correcting track numbers after recording.

In general, in the case of the existing VCR without MIC, it is difficult for the user to efficiently manage the cassette tape by writing data in an arbitrary section of the cassette tape.

In the conventional digital video cassette recorder, the cassette tape has been managed based on the track number recorded on the cassette tape. In this case, if the track number recorded on the cassette tape is discontinuous, the absolute position of the digital tape cassette is used to estimate and find the cassette tape. Efficient management was difficult.

Accordingly, it is an object of the present invention to stabilize the recording of absolute track numbers in digital VCRs that manage data recorded on cassette tapes on the basis of absolute track numbers, or to correct wrong track numbers recorded even after recording. The present invention provides a method for efficiently managing data recorded on a cassette tape by facilitating the operation.

In order to achieve the above object, the present invention efficiently manages a cassette tape by recording a situation in which an absolute track number is recorded on a tape using a MIC, which is a storage device inside a cassette tape, in a home digital VCR supporting MIC. Characterized in that configured to be.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a recording system of a DVCR system supporting MIC for explaining an embodiment of the present invention, and includes a key input unit 108 for setting all of recording / reproduction, etc. according to a user's selection, A data compressor 104 for inputting a digital voice signal to perform data compression of the input signal and outputting the compressed data; and an absolute track number to be recorded on the cassette tape when the recording mode is set in the key input unit 108. Incrementally increasing, and inputs the microcomputer 106 to read / write the memory (MIC) in the cassette tape, the data output from the data compressor 104 and the track number output from the microcomputer 106 An ECC encoder 103 for performing ECC encoding for error correction, a modulator 102 for modulating the data encoded by the ECC encoder 103, and a modulator 102 Write amplifier 101, the I ² C bus data path between the MIC and the microcomputer 106 of the cassette tape 105, the cassette tape 105 having the MIC for amplifying a signal for recording the other ( 107, and a display unit 109 for displaying a recording / reproducing state, a recording area such as a blank area, a blank flag, and the like.

The I ² C bus 107 is a communication line composed of two lines, and is composed of a clock line and a data line.

The cassette tape and each track have a unique number (absolute track number), and the information about the track number is held by the microcomputer 106. The absolute track number recorded in this way makes it possible to manage the contents of the cassette tape 105 from beginning to end. At this time, the absolute track number is a structure in which the recording start position of the tape is 0, and the track number is increased one by one.

2 is a block diagram of a DCVR reproducing apparatus according to an embodiment of the present invention, in which a reproducing amplifier 201 amplifies a signal reproduced from a cassette tape 205 and a signal output from the reproducing amplifier 201. A reproducing equalizer 201, a data detector PLL 202 for detecting data in a reproduced signal shaped by the reproducing equalizer 201 and controlling phases, and a signal output from the data detector PLL 202; A synchronous signal generator 203 for generating a synchronous signal, a demodulator 204 for demodulating data reproduced on the cassette tape 205 by inputting the output of the synchronous signal generator 203, and an output from the demodulator 204 An ECC decoder 205 for decoding the decoded data, a data decompressor 206 for decompressing the decoded data, and a video signal and an audio signal output from the data decompressor 206 are input to perform D / A conversion. D / A converter 207 and the data It consists of the microcomputer 206 which performs management of the cassette tape 205 by inputting the track number output from the expander 206. As shown in FIG.

3 is a recording data structure diagram according to the present invention, where (3a) is a pack example showing a blank area, (3b) is a pack example showing a size of a blank area, and (3c) shows a position of a blank flag. An example of a pack is shown, and (3d) is an example of a title end pack.

4 is a memory configuration diagram of the MIC in the SD-VCR cassette according to the present invention.

5 is a flowchart of blank area recording according to the present invention, in which a title end pack is read when a cassette tape exists to store the position of the end of the recording, and checks whether the position of the current cassette tape can be read as an absolute track number. In the first process, when the absolute track number can be read in the first process, the message is reproduced to the end of the track (TrEnd) at the time of playback and moved to the end of the track (TrEnd) at the time of recording, and the end of the track. A second step of checking whether a playback command continues even after the (TrEnd) position; and a third step of controlling the track to go to the position of the track end (TrEnd) when the absolute track number cannot be read in the first step. Process and control to go to the position of the end of the track (TrEnd), the fourth process asking the user whether to move, and continues even after the end of the track (TrEnd) in the second process A fifth step of recording the current TrEnd value as a blank area to the MIC of the pack having the header when the life spirit enters or does not ask for movement to the position of the TrEnd in the fourth process, and writes to the MIC Thereafter, a sixth step of estimating the current position when there is a playback or recording command is performed, recording the value in the size of the blank area, and recording the current position on the title flag.

6 is a flowchart of reformatting a cassette tape according to the present invention, wherein the first step of formatting and moving the cassette tape to the initial position of the cassette tape when the format key is input, and the blank area and the blank flag of the blanking during the formatting operation are performed. A second step of recording a new track number when a location is encountered; a new track number is recorded in a track after the first blank area of the second step; and a content of deleting the contents recorded in the MIC for the blank area to be newly recorded. There are three stages.

Therefore, a specific embodiment of the present invention will be described in detail with reference to FIGS. 1 to 6, first, the structure of the MIC, which is a storage device inside the cassette tape 105, is simply shown in FIG. MIC is divided into space 0 and space 1 area. The space 0 area is bank 0, and the space 1 area includes memory areas from bank 1 to bank 255. Each bank has a capacity of 64K bytes, so the total memory size of the MIC is 16 MBytes. Space 1 is mainly an area for recording video data such as still pictures, so that the blank area, blank area size, and blank flag position data to be recorded in the present invention are recorded in the space 0 area.

As can be seen from FIG. 4, various data are recorded in the space 0, and the area in which the data of the present invention can be recorded is limited. Specifically, the area in which the data can be recorded in the present invention is limited to a place called Maker's Optional Events. For reference, the thickness, grade, and type of tape are recorded by the manufacturer in areas such as APM (Application ID) or BCID (Basic Cassette ID).

Figure 4 specifically shows an example of data recording in the MIC. When data is recorded in the MIC, the data should be recorded in units of 5 bytes. Among them, the first byte (PCO) tells the microcomputer 106 what the following 4 bytes of data mean.

3A shows an example in which the absolute track number at which the blank area starts and the blank area number corresponding to the index of the blank area are recorded in a pack structure. In this case, the first Bytes is F1 h, indicating that the next lower 4 bytes are the Blank Area No. and the Absolute Track No. of the Blank Area. FIG. 3b is a pack indicating the size of the blank area, and the PCO value is set to Fl h as in FIG. 3a. This can be changed to a different value (F2 h-FE h), but the least significant bit of PC1 can also be sufficient to distinguish 3rd (3a) and 3rd (3b), leaving enough room for Maker's 0ptional Pack. Can be.

3C is a pack indicating the position of the blank flag, where the value of PCO is set to F2 h, indicating that the contents of the lower 4 bytes are the absolute track number and the blank flag number of the tape on which the blank flag is recorded. Fig. 3d is already defined in the format of a pack for a title. The absolute track number recorded in this pack indicates the tape position at the end of the title, that is, at the end of recording. The SR flag indicates the track pitch at the time of recording, and the RE flag indicates whether the recording protection device is applied to the tape.

The above has described the structure of the MIC, which is a memory inside a cassette tape, and the recording data types such as a blank area, a blank area size, and a blank flag in the memory.

The operation of the present invention will be described with reference to the flowcharts of FIGS. 5 and 6 as follows.

First, it is assumed that the end tape has a tie recorded on the cassette tape. In other words, it is assumed that there is recorded data on the cassette tape and that the title and pack indicates the end position (absolute track number) of the recording. In fact, the new cassette tape only records APM, BCID, cassette ID, and tape length. After the first recording, packs corresponding to Title End and other events are recorded.

First, when the cassette tape is inserted in step 5a, the microcomputer 106 reads the title end pack in the MIC, and the microcom 106 stores the value corresponding to the last position of the record in step 5b as the absolute track number. (Let's call this TrEnd). Next, in the process (5c), the present position of the cassette tape is slightly reproduced or the like, and the microcomputer 106 stores the value as an absolute track number (let this value be TrNow).

If the value of TrEnd is larger than TrNow in the process (5d), it can be seen that an operation such as rewind has been performed after the last recording. In this state, if input of playback or FF (Fast Forward) is input in step (5e), it moves to TrEnd in step (5f) and then displays as a warning message that there is no record after that.

However, even after that, if the command of the regeneration column continues in step (5g), a blank area is generated in step (5i), and the position (in this case, TrEnd) is recorded as a blank area pack on MlC, and in step (5k) The position at which the operation such as playback stops is recorded by using the estimate to pack the blank area size.

If the value of TrNow cannot be read in step (5d), it can be seen that the current position of the cassette tape is a blank area section. At this time, the user is asked whether to move to the TrEnd position in step (5h). When moving to the position of TrEnd, the subsequent operation can be normally performed. However, if the user performs an operation such as playback or recording before moving to TrEnd, the continuity is broken and a warning message is displayed to the user. If an operation command such as playback or recording is received, the Blank Area and Blank Area Size Pack are recorded in the MIC as described above. In the case of a recording command, the last recording point is recorded in the MIC as the Title End Pack.

The location of blank flag is recorded as follows.

When BF (Blank Flag) = 1, the absolute track number is recorded discontinuously. Since the microcomputer can determine the time when BF = 1, the absolute track number at that time is recorded in the blank flag position pack (F2h) indicating the blank flag position.

An example used for reformatting a cassette tape using the recorded blank area and blank flag positions is shown. If a format command is received from the user in step (6a), move the cassette tape to the beginning in step (6b), and then perform the format operation in step (6c). First, the microcomputer 206 should read the information about the title and pack, the blank area, and the blank flag position recorded on the MlC. Move to the first blank area and record the new absolute track number in the entire blank area in step (6d). If the location meets the Blank Flag, record the same.

In the process (6e), after the first blank area or the first blank flag position, the recording is based on the new track number (in the case of the first position, the track number recorded before it is recorded). For the blank area newly recorded in step (6f), the contents of the blank area pack recorded in the MIC are deleted. After formatting is complete, update the packs associated with the absolute track number. In addition, the B1ank Area Pack can be considered a method to efficiently search for cassette tapes.

As described above, the track number recorded on the cassette tape is sequentially increased to record continuously, as well as to provide a method that can be modified later even if the recording is discontinuous, thereby preventing the track number from being discontinuously recorded on the cassette tape. This has the advantage.

Claims (5)

A method of managing a cassette tape of a digital VCR system supporting MIC, wherein a discrete recording state of an absolute track number is recorded in the MIC of the cassette tape of the digital VCR system in a pack structure to reproduce, search, or change the cassette tape. Configured to be available for reformatting. In the blank recording method of cassette tape management of a digital VCR system supporting MIC, the end tape is read when the cassette tape is present, and the position of the end of recording is stored, and the current cassette tape position is an absolute track number. The first step of checking whether or not it can be read by the first step, and when the first track is read by the absolute track number, a warning message can be played to the end of the track (TrEnd) during playback and moved to the end of the track (TrEnd) during recording. And a second process of checking whether a playback command continues even after the track end (TrEnd) position, and when the track number cannot be read in the first process, the process moves to the position of a track end (TrEnd). In a third process of controlling so that it can be controlled, the fourth process of controlling to go to the position of the end of the track (TrEnd), asking the user whether to move, and in the second process Even if the end of the track (TrEnd) is passed, if a play command is received or the movement of TrEnd is not requested in the fourth step, the current TrEnd value is set as the blank area and recorded in the MIC of the pack having the header F1H. And a sixth step of estimating the current position when the reproduction or recording command is recorded in the MIC, recording the value in the size of the blank area, and recording the current position on the title flag. How to. A reformatting method for managing cassette tapes in a digital VCR system supporting MIC, comprising: a first step of formatting and moving a cassette tape to an initial position when a format key is input to the digital VCR system; If a blank area and a blank flag are encountered during the operation, a second step of recording a new track number and a new track number are recorded in the tracks after the first blank area of the second step, and a new track number is recorded in the MIC. And a third step of deleting the recorded contents. In a cassette tape management method of a digital VCR system supporting MIC, a title end pack is read when the cassette tape exists to store the position of the end of the record, and the position of the current cassette tape can be read as an absolute track number. Process of warning message to play to the end of the track (TrEnd) during playback and move to the track (TrEnd) position during recording, or to check whether the continuous play command is received even after the end of the track (TrEnd); In this process, when the absolute track number cannot be read, the control is made to move to the position of the end of the recording track (TrEnd). When not moving to the position of TrEnd, write the current TrEnd value to the position of the blank area and write it to the MIC of the pack having F1H as a header. After the recording and playback or recording command in the MIC, the current position is estimated, the value is recorded in the size of the blank area, the current position is recorded in the title flag, and the cassette tape is input when the format key is input to the digital VCR system. If a blank area and a blank flag are encountered during the formatting process by moving to the first position and formatting, new track number is recorded, and a new track number is recorded in the track after the first blank area, and the blank area is newly recorded. The method is characterized in that for the process of deleting the contents recorded in the MIC. A cassette tape management system of a digital VCR system supporting MIC, comprising: means for reading a title end pack when the cassette tape is present, storing the position at the end of the record, and reading the position of the current cassette tape as an absolute track number; Can be played back to the end of the track (TrEnd) during playback and alerted to move to the end of the track (TrEnd) during recording, or to check if the playback command continues even after the end of the track (TrEnd). Means and controls to go to the position of the end (TrEnd) of the recording track when the absolute track number can not be read, and the user is asked whether to move, even if the end of the track (TrEnd), the play command is continuously received or the When not moving to the position of TrEnd, the current TrEnd value is set as the position of the blank area and recorded in the MIC of the pack having F1H-FEH as the header. Means for estimating the current position when there is a playback or recording command after recording in the MIC, recording the value in the size of the blank area, recording the current position in the title flag, and inputting a format key into the digital VCR system. Moving to the initial position of the tape and formatting, if a blank area and a blank flag are encountered during the formatting operation, a means for recording a new track number, and a new track number is recorded for the tracks after the first blank area. The system is characterized by a means for deleting contents recorded in the MIC.