KR100244173B1 - Digital multi-functional disc recorder - Google Patents

Abstract

The present invention relates to a recording apparatus for recording data in real time on a digital multi-function disk (DVD), and more particularly, to an encoder for encoding bit stream data in accordance with a DVD format, a memory for temporarily storing the encoded data, and a data write / A memory controller for controlling reads, a write pulse generator for generating write pulses from the signal read from the memory, and a laser for driving data in the data recording area of the disc in real time by driving a laser diode by the write pulses It consists of a diode driver, which encodes real-time input data in DVD format, temporarily stores the encoded data in recordable block units, and generates a recording pulse by reading N times faster than normal speed after the block data is stored. By recording data, bad during recording Data recording is made stable in real time even when the pickup jumps to another position due to sector or other reasons.

Description

Digital Versatile Disc (DVD) Recorder

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital versatile disc (DVD) recording apparatus, and more particularly, to a DVD recording apparatus for recording input data in real time by making the recording speed faster than the data input speed.

FIG. 1 is a block diagram of a conventional DVD recording apparatus for recording data input in real time such as over-the-air broadcasting (DBS) on a DVD. The DVD encoder 11 is a moving picture expert group transmitted as shown in FIG. 3A. ; MPEC) Encode bit stream data in accordance with DVD-RAM format.

The recording pulse generator 12 generates a recording pulse by the encoded signal to output a pit corresponding to the signal to be recorded on the disc, and outputs the recording pulse to the laser diode (LD) driver 13, and outputs the LD driver ( 13) controls the LD by the recording pulse to generate desired pits on the disk 14, whereby data is recorded.

At this time, since the DVD encoder 11 generates a delay time of? T as shown in FIG. 3b, data is recorded with a delay of? T.

However, since the encoding speed is very fast compared to the data input speed, there is no problem in real-time recording. However, in the process of recording a signal on the actual disc by this encoded data, there is a situation that does not correspond to the input speed and 1: 1. have.

In other words, a rewritable DVD-RAM disc is managed in zones as shown in FIG. 2 for random access. A total of 24 zones are divided.

For example, the rewritable optical disc is divided into a lead in area, a data area, and a lead out area from the innermost side in the radial direction, wherein the zone is a unit for dividing the data area. This is the area where actual data is recorded.

Each zone is divided into a minimum of 17 sectors and a maximum of 40 sectors, and is not physically connected, so if a jump is made to another recordable position during recording, a time delay is delayed and real time recording is not possible. Occurs.

For example, if there is a bad sector in the middle due to a disk defect or the like and a sector which cannot be rewritten is found, another recordable sector position must be found.

At this time, the movement between the zone and the zone is picked up by the sled motor to the rough (Rough) jump to the rough position to grasp the position, and then track to the desired position by pick-up to go to the corresponding sector.

In order to know the current position, the header area must be read. If the jumped position is more likely to be the data area than the header area, the time until the header of the next sector is reached when jumping to the data area is increased. Becomes Ross.

In addition, after the jump, the read clock phase locked loop (PLL) becomes unstable, so it is necessary to wait for the spindle and read clock PLL to stabilize, and then read the header area. This requires reading the data required for the PLL.

This information is also in the header, so the latency is longer.

As such, it takes time to go to the next sector and time to stabilize the PLL (Phase Locked Clock) clock by using the header information of the sector. Thus, during the waiting time (Δt '), real time recording becomes difficult.

That is, since the inputted information is input in real time, information at this time is inevitably lost.

For example, if the 3c is data recorded at normal speed (1x speed) and a waiting time of Δt 'is required, data is lost by the waiting time in real time recording.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to encode real-time input data in DVD format and temporarily store the encoded data in a memory in recordable block units, and then read data from the memory at NX speed. The present invention provides a DVD recording apparatus capable of real-time recording without data loss even when jumping to another position during recording.

1 is a block diagram of a conventional DVD recording apparatus.

2 shows the structure of a general rewritable DVD.

3 is a diagram illustrating each sub-operation timing of FIG.

4 is a block diagram of a DVD recording apparatus according to the present invention.

5 is an operation timing diagram of each part of FIG.

* Explanation of symbols for the main parts of the drawings

41: DVD encoder 42: memory

43: memory controller 44: recording pulse generator

45: laser diode drive 46: optical disk

A feature of the DVD recording apparatus according to the present invention for achieving the above object is an encoder for encoding bit stream data in accordance with the DVD format, a memory for temporarily storing the encoded data, and the data write / read of the memory A memory control unit for controlling the memory; a write pulse generation unit for generating a write pulse based on the signal read from the memory; and a laser diode for driving data in the data recording area of the disc in real time by driving the laser diode by the write pulse. It is configured to include a drive unit.

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

4 is a block diagram of a DVD recording apparatus according to the present invention for recording data input in real time such as over-the-air broadcasting (DBS) on a DVD.

4, a DVD encoder 41 for encoding input data in accordance with a DVD format, a memory 42 for temporarily storing the encoded data, and a memory controller for controlling read / write of the memory 42 ( 43), a recording pulse generation section 44 for generating a recording pulse using the signal read out from the memory 42 at Nx speed, and LD controlled by the recording pulse to generate desired pits on the disk 46; LD drive part 45 is comprised.

According to the present invention configured as described above, MPEC bit stream data transmitted as shown in FIG. 5A is encoded by the DVD encoder 41 in accordance with the DVD-RAM format, and then the encoded data is stored in data block units under the control of the memory controller 43. Temporarily stored in the memory 42.

At this time, since the DVD encoder 41 generates a delay time of? T as shown in FIG. 5B, data is stored in the memory 42 after? T time.

When data is recorded on the actual disk 46, recording is performed in units of blocks. Usually, a recording block unit of a DVD is 16 sectors in units of an error correction code (ECC) block.

Therefore, when all data in block units, that is, 16 sectors of data, are stored in the memory 42, data is read from the memory 42 under the control of the memory controller 43 and input to the recording pulse generator 44. do.

At this time, the memory controller 43 speeds the read clock of the memory 42 faster than that of the normal clock, that is, the write clock.

In addition, the memory control section 43 adjusts the memory 42 so that no overflow or underflow occurs.

Accordingly, the recording pulse generator 44 generates a recording pulse using data input N times faster than the normal speed.

That is, the speed of the recording pulse becomes N times.

The recording pulse is generated to make a pit on the disc suitable for the signal to be recorded.

The LD driver 45 controls the LD to generate a desired pit on the disk 46 by the generated write pulse.

That is, data is recorded in units of blocks in the data recording area of the disc 46.

At this time, the disk 46 is also controlled to have a rotation speed xN times.

As the recording speed is × N times faster than the data input at the normal speed, if the ideal recording time for the actual disk is T, the double speed recording time is as shown in FIG. Because of, As much as I can afford.

Therefore, even if there is a need to jump to another recording position on the way by a bad sector or a disk defector or the like and a waiting time of Δt 'is required, there is sufficient margin, so that data of the next input block unit can be recorded in real time.

In other words, the time to process the actual recording The data is stably recorded in real time because the operation can be terminated until the next block unit is sufficiently written, even if the pickup moves to another position in the meantime.

As described above, according to the present invention, the DVD recording apparatus encodes real-time input data in the DVD format, temporarily stores the encoded data in recordable blocks, and reads N times faster than the normal speed after the block data is stored. By generating a recording pulse and recording the data, data recording is made stable in real time without data loss even if the pickup jumps to another position due to bad sectors or other reasons during recording.

Claims (3)

An encoder for encoding bit stream data in accordance with a digital multi-function disc (DVD) format, a memory for temporarily storing the encoded data, and a data write / read of the memory at a read speed of N times the normal write speed. A memory control unit for controlling, a write pulse generation unit for generating a write pulse by a signal read from the memory at N-times speed under the control of the memory control unit, and a laser diode driven by the write pulse to drive the data recording area of the disc. Digital multi-function disk recording apparatus comprising a laser diode driver for recording data in real time. The digital multi-function disc recording apparatus as claimed in claim 1, wherein data is recorded in block units under control of the memory controller. The digital multifunction disc recording apparatus as claimed in claim 2, wherein the block unit is an error correction code unit.