KR940003666B1 - Digital recording and reproducing apparatus - Google Patents

Abstract

By having a circuit for recording and playback system jointly, this device makes simple. It comprises: A/D converters (110,120) for converting analog signal to digital signal; compression circuits (130,140); RAMs (150,160) for memorizing input signal; a switching circuit (170) for selecting the RAM output; a Micom (180) for controlling the overall system; an Error Correction Code (ECC) circuit (190) for adding parity to the RAM data; an adder (200) for adding a synchronous signal and an index to the ECC output; a signal generator (210); an amplifier (230); and a head (HD) for recording the amplifier output.

Description

Digital recorder

1 is a block diagram of a recording system of a digital recording and reproducing apparatus according to the present invention.

2 is a configuration diagram of a reproduction system of the digital recording and reproducing apparatus according to the present invention.

3 is a block diagram of an ECC circuit in FIGS. 1 and 2;

4a, b, c, and d are waveform diagrams showing the format of the switching pulse of the fourth switch section of FIG.

to be.

* Explanation of symbols for main parts of the drawings

110,120: A / D converter 130,140: compression circuit

150, 160, 192, 193, 195, 198: RAM 170: Switch circuit

180: micom 190: ECC circuit

200: adder 210: signal generator

220: modulator 230: amplifier

115,125: D / A converter 135,145: extension circuit

225: demodulator

S1, S2, S3, S4: 1st, 2nd, 3rd, 4th switch

HD: Head

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a digital recording and reproducing apparatus, and more particularly, to a digital recording and reproducing apparatus in which a circuit configuration is simplified by sharing circuits of a recording and reproducing system.

The digital recording and reproducing apparatus currently used has independent loops for video signal processing and loops for audio signal processing. Therefore, the circuit is complicated, the cost of the product is increased, and the volume and weight of the product are increased to counter the trend of light and short.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to configure an error correction code (ECC) circuit, a modulator, a recording amplifier, a head, a preamplifier and a demodulator when recording and reproducing audio and video signals. The present invention provides a digital recording and reproducing apparatus that can reduce the cost and downsizing of a product by allowing it to be processed at the same time with only a loop.

In order to achieve the above object, the present invention provides a plurality of A / D converters for converting a video signal and an audio signal into digital signals, and compression circuits for respectively compressing a digital output signal connected to the A / D converters. RAMs connected to the compression circuits to record input signals, switch circuits connected to the RAMs to select an output of the RAM, and connected to the switch circuits to control the driving of the switch circuits. An ECC (Error Correction Code) circuit connected to the control circuit to add parity to data of video RAM and audio RAM connected to the switch circuit, and a synchronization signal and an index are synthesized to the output of the ECC circuit. A multiplier, a signal generator connected to the multiplier to provide a synchronization signal and an index, and a signal output from the adder connected to the adder And a recording system comprising a modulator for modulating a signal, an amplifier connected to the modulator and amplifying a modulated signal, and a head connected to the amplifier for recording a signal output from the amplifier on a recording medium. A demodulator for demodulating a signal output from the head connected to the head, a demodulator connected to the head, the ECC circuit for adding parity to the demodulated signal, and an ECC circuit; A switch circuit connected to the switch circuit for switching the output of the ECC circuit, a microcomputer connected to the switch circuit to control the driving of the switch circuit, and connected to the switch circuit, respectively, and selected by the switch circuit to store video and audio signals. RAMs, and expansion circuits connected to the RAMs to expand video and audio signals stored in the RAM to their original sizes, and the expansion circuits. Are coupled has a feature that the digital signal outputted from the expansion circuit converts an analog signal to each video signal and a digital recording and reproducing apparatus configured and reproducing system in the D / A converter for outputting an audio signal.

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

First, Figure 1 shows the configuration of a digital recorder according to the present invention, the compression circuit 130 for compressing the digital signal input to the A / D converter 110 receives the video signal and converts it into a digital signal is connected The compression circuit 130 is connected to a RAM 150 for storing a signal output from the compression circuit 130. On the other hand, the A / D converter 120 for receiving an audio signal and converting it into a digital signal is connected to a compression circuit 140 for compressing the input digital signal, which is output from the compression circuit 140. RAM 160 for storing the signal to be connected is connected. The compression circuit 140 is an option, and when the compression circuit 140 is not required, the output side of the A / D converter 120 is directly connected to the RAM 160. Each of the RAMs 150 and 160 is connected to a switch circuit 170, and a microcomputer 180 for controlling driving of the switch circuit 170 is connected to the switch circuit 170.

In addition, video and audio signals are output to the switch circuit 170 by adding parity from the RAM 150 or the ECC circuit 190 to which the RAM 160 is selectively connected according to the switching of the switch circuit 170. An adder 200 for synthesizing a synchronization signal and an index is connected to the adder 200, and a signal generator 210 for generating the synchronization signal and the index signal is connected to the adder 200.

In addition, the adder 200 is connected to a modulator 220 for modulating the input signal, the modulator 220 is connected to the amplifier 230, the amplifier 230 is a head (HD) Is connected.

FIG. 2 shows the configuration of the digital reproduction system according to the present invention, in which the same reference numerals as those in FIG. 1 are shared between the recording and reproduction systems.

That is, in the digital reproduction system, the head HD, which reads information from the recording medium, is connected to the amplification unit 230 for amplifying the reproduced signal. Demodulation unit 225 for demodulation is connected. The demodulator 225 is connected to the ECC circuit 190 to add parity to the reproduced signal.

The ECC circuit 190 is connected to the switch circuit 170 for switching the signal output from the ECC circuit 190 to a video and audio circuit. The switch circuit 170 is connected to a microcomputer 180 for driving control of the switch circuit 170. In addition, the switch circuit 170 is connected to the RAM 150 for recording a video signal and the RAM 160 for recording an audio signal.

An extension circuit 135 for extending the video signal output from the RAM 150 to an original signal size is connected to the RAM 150, and the RAM 160 is configured to transmit an audio signal from the RAM 160. An expansion circuit 145 extending to a signal size is connected.

The expansion circuit 135 has a D / A converter 115 for converting an input digital video signal into an analog signal, and the expansion circuit 145 converts an input digital audio signal into an analog signal. Converter 125 is connected.

The decompression circuit 145 is an option, and does not need to be used when the compression circuit 140 is not used in the recorder. In this case, the output of the RAM 160 is connected to the D / A converter 125. . The ECC circuit 190 may be implemented in a detailed circuit configuration as shown in FIG.

That is, an outer coder 191 connected to the switch circuit 170 to add parity to a video signal and an audio signal, respectively, and a switch connected to the outer coder 191 to be switched by the microcomputer 180. RAM 192 connected to the controlled first switch unit S1 and the first switch unit S1 and storing video and audio signals to which parity is added according to the switching of the first switch unit S1, respectively. And a second switch unit S2 connected to the RAMs 192 and 193 and controlled by the microcomputer 180 to select an output of the RAMs 192 and 193. And a second switch section S2 connected to the second switch section S2 for selecting an audio signal and an output according to the selection of the second switch section S2, and to the second switch section S2. An inner code 194 connected to generate an inner code according to an audio signal and a video signal according to selection of the second switch unit S2; The third switch unit S3 connected to the node 194 and switched under the control of the microcomputer 180, and the third switch unit S3 are respectively connected to the third switch unit S3 to switch the video according to the switching of the third switch unit S3. RAM 195 for storing a signal and RAM 196 for storing an audio signal, and are connected to the RAMs 195 and 196 and switched under the control of the microcomputer 180 to be added to the video adder 200. It consists of a fourth switch unit (S4) for selectively providing a signal and an audio signal.

According to the present invention configured as described above, when the video signal is input in the recording mode, the A / D converter 110 converts the signal into a digital video signal. This digital video signal is stored in the RAM 150 after data compression is performed by the compression circuit 130.

On the other hand, the audio signal is converted into a digital audio signal by the A / D converter 120, and the option is input to the RAM 160 after the data is compressed in the compression circuit 140.

When the compression circuit 140 is not installed, the output of the A / D converter 120 is directly input to the RAM 160.

The microcomputer 180 controls the switching of the switch circuit 170 and alternately inputs the stored data of the RAM 150 and the RAM 160 to the ECC circuit 190. As described above, the digital signals of the video and the audio which are alternately input to the ECC circuit 190 are added with parity by the outer code 191 of the ECC circuit 190, and the video signals are switched by the switching of the first switch unit S1. In RAM 192, audio signals are stored in RAM 193, respectively.

The video signals and the audio signals stored in the RAMs 192 and 193 are alternately input to the inner code 194 according to the switching of the second switch unit S2 to generate the inner code, and the inner code 194 The output of the video signal is stored in the RAM 195 according to the switching of the third switch unit S3 and the audio signal is stored in the RAM 196, and the video signal is switched by the switching of the fourth switch unit S4. The audio signals are alternately selected and output to the adder 200. In the fourth switch S4, switching pulses are selected by formats of 4a, b, c, and d to output video and audio data. The output signal of the adder 200 is modulated by the modulator 220 and then amplified by the amplifier 230 and recorded on the recording medium through the head HD.

In the reproduction mode, the signal to be reproduced through the head HD is amplified by a large force in the amplifier 230 and then demodulated to the original digital signal through the demodulator 225. Thereafter, the signal is input to the ECC circuit 190, and the signal flows in a reverse direction to the signal flow in the recording mode. The signal is input to the switch circuit 170. The video signal is switched by the switching of the switch circuit 170. After being input to the expansion circuit 135 through the RAM 150 and expanded to the original signal size, the D / A converter 115 converts the analog signal into an analog signal and outputs a video signal.

In addition, the audio signal is input to the expansion circuit 145 through the RAM 160 and expanded to the original signal size, and then converted into an analog signal through the D / A converter 125 to output an audio signal.

According to another embodiment of the present invention, in the configuration of the recording system of FIG. 1 and the reproduction system of FIG. 2, ECC circuits are separately provided on the output sides of the RAMs 150 and 160 at the input routes of the video signal and the audio signal. After that, the recording circuit is configured to switch the ECC circuit in the switch circuit 170 and to output the alternator 200 to the adder 200, and the reproduction signal through the head HD, the amplifier 230, and the demodulator 225 is switched to the switching circuit ( 170 and the video signal and the audio signal are alternately input to the two ECC circuits according to the switching of the switching circuit 170, and the extension circuits are connected to the ECC circuits, respectively, and then the D / A converters ( 115) and 125 are embodiments in which a regeneration system is connected. In other words, this embodiment divides the video signal and the audio signal up to the ECC circuit and then shares the circuit thereafter.

As described above, according to the digital recording and reproducing apparatus according to the present invention, since the ECC circuit, the modulator, the demodulator, the amplifier, and the head are shared by the audio and video signal system for recording and reproducing, the configuration of the system is greatly simplified. It is light and small, and the cost is reduced.

Claims (3)

A compression circuit connected to each of the A / D converters 110 and 120 and the A / D converters 110 and 120 for converting a video signal and an audio signal into a digital signal, respectively, to compress a digital output signal; 130, 140, RAM 150, 160 for recording signals input and connected to the compression circuits 130, 140, and RAM 150, 160, respectively. A switch circuit 170 for selecting outputs of the RAMs 150 and 160, and a microcomputer 180 connected to the switch circuit 170 to control the driving of the switch circuit 170 to control the entire system; An ECC circuit 190 connected to the switch circuit 170 to add parity to data of the RAMs 150 and 160, and an output of the ECC circuit 190 connected to the ECC circuit 190. An adder 200 for synthesizing a synchronization signal and an index, a signal generator 210 connected to the adder 200 and providing a synchronization signal and an index, and connected to the adder 200 A modulator 220 for modulating the signal output from the counting machine 200, an amplifier 230 for amplifying the modulated signal connected to the modulator 220, and amplified for being connected to the amplifier 230 A recording system comprising a head HD for recording a signal output from the unit 230 onto a recording medium; the head HD for reproducing a signal recorded on the recording medium; and a head HD connected to the head HD. The demodulation unit 225 for demodulating a signal outputted from the subfield, the ECC circuit 190 connected to the demodulation unit 225 to add parity to the demodulated signal, and the ECC circuit 190 The switch circuit 170 for switching the output of the ECC circuit 190, the microcomputer 180 connected to the switch circuit 170 to control the driving of the switch circuit 170, and the switch circuit 170 Respectively connected to the RAMs 150 and 160 for storing video and audio signals, respectively, and to the RAMs 150 and 160, respectively. Connected to each of the extension circuits 135 and 145 and the extension circuits 135 and 145 which extend the video and audio signals stored in the RAMs 150 and 160 to their original signal sizes. A digital recording and reproducing apparatus comprising a reproducing system composed of D / A converters (115) and (125) for converting digital signals output from the extension circuits (135) and (145) into analog signals and outputting video and audio signals, respectively. 2. The digital recording and reproducing apparatus according to claim 1, wherein the recording system is an optional compression circuit (140) and the reproducing system is an optional extension circuit (145). According to claim 1, wherein the ECC circuit 190 is connected to the outer circuit coder 191 and the outer coder 191 connected to the switch circuit 170 to add a parity to the video signal and the audio signal, respectively The first switch unit S1 controlled by the microcomputer 180 and a video signal and an audio signal connected to the first switch unit S1 and to which parity is added according to the switching of the first switch unit S1. Are connected to the RAM 192 and 193 and the RAM 192 and 193 and are controlled by the microcomputer 180 to select outputs of the RAM 192 and 193. An inner cord connected to the second switch section S2 and the second switch section S2 to generate inner codes in accordance with the audio signal and the video signal according to the selection of the second switch section S2; RAM 195 and an audio signal respectively connected to the third switch unit S3 to store the video signal according to the switching of the third switch unit S3. And a fourth switch unit connected to the RAMs 195 and 196 and switched under the control of the microcomputer 180 to selectively provide a video signal and an audio signal to the adder 200. A digital recording and reproducing apparatus of (S4).