KR100301486B1 - Signal processing method for recording and reproducing logntime of magnetic rcording and reproducing apparatus - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal processing method for a long time recording and reproducing of a magnetic recording and reproducing apparatus. In the related art, when the amount of actual data input in the reference mode is small, dummy data is recorded, thereby causing a problem of quantitative loss of tape. Therefore, in the present invention, when the digital data is recorded on the recording medium, the data is recorded on the recording medium only when the data is valid according to the data valid signal of the track unit in which the actual data is recorded.

Description

SIGNAL PROCESSING METHOD FOR RECORDING AND REPRODUCING LOGNTIME OF MAGNETIC RCORDING AND REPRODUCING APPARATUS}

According to the present invention, a long time recording of a magnetic recording / reproducing apparatus which enables recording for a long time by recording the inputted digital data on a recording medium without recording dummy data when the digital data is not input, and recording certain data as it is collected. The present invention relates to a signal processing method during playback. In particular, when (n-1) / n tracks store actual data in a buffer and the time of a track to be recorded is reached, the data is removed from the buffer and recorded. The present invention relates to a signal processing method for long time recording and reproducing of a magnetic recording and reproducing apparatus capable of recording data.

1 is a block diagram of a general magnetic recording and reproducing apparatus, and includes an interface unit 11 for transmitting and receiving digital data to and from an external system according to a protocol determined as shown in the figure, and data or recording medium to be recorded on a recording medium. A memory controller 18 for storing the data read from the data into an internal smooth buffer and shuffling / deshuffling the stored data to the first and second memories 13 and 16, The first coder 12 which encodes the shuffled data stored in the memory 13 in the row direction and encodes the shuffled data stored in the memory 13. Error correction in the column direction with respect to the second coder 14 for encoding and deshuffled data stored in the memory 16 in the row direction. Deeds and Ah A first decoder 15 for resonating and decoding, and a second decoder 17 for performing error correction in the column direction and decoding the deshuffled data stored in the memory 16. And a digital channel interface unit 19 for recording data encoded by the first and second encoders 12 and 14 in a sync block structure or reading data from the track from the sync block structure. And an analog unit 20 which converts the data transmitted from the digital channel interface unit 19 to analog and records the data on the recording medium 21 or extracts data and a clock from the recording medium 21.

As shown in FIG. 2, the memory controller 18 sequentially stores a smoothing buffer 18a for sequentially storing data input through the interface unit 11 and data read from a recording medium. Reads and shuffles the data stored in the smoothing buffer 18a and the data stored in the smoothing buffer 18a, or stores the data in the shuffle memory, or reads and deshuffles the data from the shuffle memory. Control logic 18b to be stored in the

Looking at the prior art configured as described above is as follows.

When data is to be recorded on the recording medium, when digital data is input from the outside through the interface unit 11 in a standard mode (hereinafter, referred to as SD mode), the memory controller 18 may control its control logic unit ( 18Bb), the digital data is sequentially stored in the smoothing buffer 18a. If the digital data is input through the interface unit 11, the digital data is stored. If the data is not input, the dummy data is stored.

When a certain amount of data is input in this way, the control logic unit 18b reads the digital data from the smoothing buffer 18a, shuffles it, transfers it to the first memory 13, and stores it.

The digital data stored in this way is read by the first code unit 12, error correction is performed in the ROW direction, encoded, and stored in the first memory 13 again.

Then, the second coder 14 reads the data stored in the first memory 13 again, corrects the error in the column COLUMN direction, encodes it, and transmits the encoded data to the digital channel interface unit 19.

Then, the digital channel interface unit 19 synchronizes the transmitted data with a sync pattern, an Id code and parity, and data (main data) and parity according to the data as shown in FIG. 3. The block structure is transmitted to the analog unit 20.

In this case, when there is no data read from the first memory 13, the digital channel interface unit 19 records dummy data instead of main data in FIG. 3.

Then, the analog unit 20 converts the digital data transmitted from the digital channel interface unit 19 into an analog signal and records the data on the recording medium 21. The main data transmitted from the digital channel interface unit 19 If there is, the data is recorded on the recording medium 21. If the data to be transmitted is dummy data, the data is not recorded on the recording medium 21 because there is no actual data.

When the data recorded on the recording medium 21 is to be reproduced, the analog unit 20 reads an analog signal from the recording medium 21 and converts the analog signal into digital data. To send.

Then, the digital channel interface unit 19 reads data from the sync block structure and transmits the data to the second decoder 17.

Accordingly, the second decoding unit 17 performs error correction in the column direction, decodes the data, and stores the same in the second memory 16.

Then, the first decoder 15 reads the data stored in the second memory 16, performs error correction in the row direction, decodes the data, and transmits the decoded data to the memory controller 18 again.

The data transmitted in this way is received by the control logic unit 18b of FIG. 2 and deshuffled to be temporarily stored in the smoothing buffer 18c.

At this time, if the data read from the recording medium 21 is dummy data, no signal processing is performed.

The memory controller 18 transmits the data processed as described above to the outside through the interface unit 11.

In this manner, data is recorded on the recording medium or the recorded data is reproduced.

However, in the prior art as described above, when there is no actual data input when recording the digital data on the recording medium, the dummy data is recorded on the recording medium, so there is a problem that it takes a long time when recording, and unnecessary data is recorded on the recording medium. Therefore, there is a serious problem of waste of a recording medium such as tape.

Therefore, an object of the present invention for solving the conventional problems as described above is to record a large amount of data input when the input data rate is low during the long time recording and playback of the magnetic recording and reproducing apparatus The present invention provides a signal processing method.

Another object of the present invention is to record on the recording medium only for a long time when the data is valid according to the data valid signal of the track unit in which the actual data is recorded when recording the digital data on the recording medium. The present invention provides a signal processing method for long time recording and reproducing of a magnetic recording and reproducing apparatus.

Another object of the present invention is to store the actual data by storing the actual data in the buffer for the time of (n-1) / n track and then taking the data out of the buffer and recording the data when the time of the track is to be recorded. The present invention provides a signal processing method for a long time recording and reproducing of a magnetic recording and reproducing apparatus in which the amount is increased to approximately n times in time.

1 is a block diagram of a general magnetic recording and reproducing apparatus.

FIG. 2 is a block diagram of a memory controller in FIG. 1; FIG.

3 is a block diagram of a sync block of data recorded on a recording medium;

FIG. 4 is an explanatory diagram showing a form in which a track of a recording medium is recorded in a long play mode recorded in the recording medium; FIG.

Fig. 5 is a signal timing diagram for signal processing during long time recording in the magnetic recording and reproducing apparatus of the present invention.

6 is a signal timing diagram for signal processing during prolonged reproduction of the present invention.

Explanation of symbols on the main parts of the drawings

11: interface unit 12: first code unit

13: 1st memory 14: 2nd code part

15: first decoding unit 16: second memory

17: second decoding unit 18: memory control unit

19: digital channel interface unit 20: analog unit

21: recording medium

In order to achieve the above object, the present invention provides a first step of counting a track start signal generated in each track when digital data is recorded on a recording medium in a long play mode (LP), and when there are N track start signals counted above. A second step of generating a shuffling reference signal every time; a third step of finding a section in which the data to be recorded on the tape when the shuffling reference signal is generated; and a second step of generating a valid track start signal in each section of the data. And a fifth step of generating a data shuffling signal for shuffling the recording data for every N pieces by counting the valid track start signals.

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

The signal processing method for long time recording of the magnetic recording and reproducing apparatus of the present invention comprises the first step of counting a track start signal generated in each track when recording digital data on a recording medium in a long play mode (LP), and the tracks counted above. A second step of generating a shuffling reference signal whenever there are N start signals, a third step of finding a section in which data to be recorded on the tape when the shuffling reference signal is generated, and a valid track for each section in which the data is present A fourth step of generating a start signal and a fifth step of generating a data shuffling signal for shuffling the recording data for each N number of valid track start signals.

In addition, the signal processing method for long time reproduction of the magnetic recording and reproducing apparatus of the present invention provides a shuffle request signal for requesting to generate a reference signal in units of shuffle when a track start signal is generated in each track during digital data reproduction from a recording medium in a long play mode. A first step of generating, a second step of generating a shuffle reference signal according to a double speed when the shuffle request signal is generated, and a third step of generating a track start signal for each valid section of the track after generating the shuffle reference signal; Is done.

Referring to the operation and effect of the present invention configured as described in detail as follows.

If the actual amount of input data is small in SD mode, the dummy data should be recorded, which can cause quantitative loss of tape.

Therefore, recording data every 1 / n track allows the tape to be used efficiently.

That is, in FIG. 4, (a) is a form of recording or reproducing data in the SD mode, and (b) (c) (d) is 1 of the long play mode (hereinafter referred to as LP mode). Data is recorded or reproduced at 3x speed.

For example, if data is recorded or reproduced in section (b), recording or reproduction is not performed in (c) and (d).

Therefore, in the SD mode or LP mode, the track width is the same, but the amount of track shifted is reduced by 1/3.

As a result, when the actual data is stored in the smooth buffer 18a of FIG. 2 for the time of (n-1) / n track and it is the time of the track to be recorded, the data is taken out of the smooth buffer 18a and recorded. In this case, since the amount of dummy data is small, the amount of data recorded on the tape is the same, but the amount of actual data is increased, thereby increasing the time to nearly n times.

When data to be recorded on the recording medium is to be reproduced, since dummy data is not recorded, the data can be reproduced at a track or double speed.

The process of signal processing when data is to be recorded on the recording medium in LP mode will now be described based on the timing diagram of FIG. 5.

When the track start signal Track-P as in FIG. 5A is input through the interface unit 11 of FIG. 1, the memory controller 18 counts the track start signal Track-P. (S1)

Every time the counted track start signal Track-P becomes six, for example, the shuffling reference signal Shuffle-P, which is a reference signal in units of shuffle, is generated as shown in FIG. (S2)

The shuffling reference signal Shuffle-P is a signal that can be used to divide the memory area into bank units in controlling the shuffle memory of FIG. 2.

When the shuffling reference signal (Shuffle-P) is generated in step S2, as shown in (c) of FIG. 5, a section in which data is loaded is found (S3). As in (d) of 5, a valid track start signal (Valid Track-P) is generated (S4).

At this time, when the actual data is input as shown in (c) of FIG. 5, the input data is sequentially stored in the smooth buffer 18a, and is not stored when the actual data is not input.

The track on which data is loaded in step S3 is data in 1/3 LP mode.

Then, the valid track start signal (Valid Track-P) generated as in step S4 is counted, and each time the count is six, for example, the data shuffling signal as shown in FIG. (Valid Shuffle-P) occurs (S5).

When the data shuffling signal Valid Shuffle-P is generated, the control logic unit 18b of the memory controller 18 shuffles the data stored in the first memory 13, and shuffles the data. The data is transmitted to the digital channel interface unit 19 so that the data can be recorded on the recording medium 21.

Therefore, one track in the SD mode moves in units of three tracks in the LP mode, so that the number of data recorded on one tape is the same, but the time is increased three times in time.

A case of reproducing data recorded on the recording medium will be described with reference to the timing chart of FIG.

If a track start signal (Track-P) as shown in Fig. 6 (a) is transmitted from the recording medium to each track from the digital medium interface unit 19, the memory controller 18 will be shown in Fig. 6 (b). The digital channel interface unit 19 generates a shuffle request signal (Shuffle eq) requesting to generate a reference signal in units of shuffle (S11).

Then, at 1 / n speed in the LP mode, a double speed shuffle reference signal in the track (n-1) is generated to the digital channel interface unit 19 as shown in (c) of FIG. 5 (S12).

At this time, until the double speed shuffle reference signal is generated, as shown in (d) of FIG. 5, a double speed track start signal is generated according to the first shuffle reference signal, and after the double speed shuffle reference signal is generated, FIG. Each time a valid data section is found, as shown in FIG. 9, a double speed track start signal is generated as shown in FIG.

Then, data is read and reproduced in accordance with the double speed track start signal.

In this way, when digital data is not input, dummy data is not inserted, and when certain data are gathered at the time of digital data input, the data is recorded and the recorded data is reproduced, so that recording can be performed for a long time.

Therefore, the present invention does not store data when data is not input, and stores data only when data is input, and records the data on a recording medium when the stored predetermined data is collected, thereby recording a lot of actual data in time. There is one effect that can be done.

Claims (3)

A first step of counting a track start signal generated in each track in the long play mode LP; a second step of generating a shuffling reference signal for every N track start signals counted above; A third step of finding a section having data to be recorded on the tape when a ring reference signal is generated; a fourth step of generating a valid track start signal for each section of the data; and counting the valid track start signals every N times And a fifth step of generating a data shuffling signal for shuffling the recording data. A first step of receiving a track start signal generated in each track and generating a shuffle request signal for generating a reference signal in units of shuffle after the first track start signal; and the shuffle reference according to the double speed when the shuffle request signal is generated A second step of generating a signal, and a third step of generating a track start signal for each valid section of the track at double speed after the shuffling reference signal is generated. Way. 3. The signal processing method of claim 2, further comprising generating a track start signal for every track before generating the shuffle reference signal in the third step.