KR0175258B1 - Dvcr - Google Patents

Abstract

A data transmission circuit of a digital BC apparatus having servo means for controlling a reproduction mechanism in a still mode or a reproduction mode in response to a predetermined control signal, and an RS-232C connected to an external device. The data transfer circuit writes / reads data picked up from a recording medium under control of the servo means to an ECC memory, and stores and outputs one frame of still image data in the ECC memory in response to a data transfer mode signal. A digital signal processor which expands the data output from the ECC unit and outputs a frame reference signal, and stores and outputs the decompression data output from the digital signal processor in response to a write and read control signal. A memory for storing and outputting the decompressed data output from the digital signal processor by input of a data transfer mode signal, and a frame reference signal output from the digital signal processor by inputting a data transfer mode signal to detect the frame reference signal; Control the recording of memory, Memory control means for controlling the reading of the memory in response to a transmission request signal, and connected to an external device through the RS-232C to supply a data transfer mode signal from the external device to the control means, and to transmit the data transmission request. RS-232C control means for detecting a signal and supplying it to the memory control means and simultaneously transmitting data output from the memory to an external device through the RS-232C.

Description

Data transmission / reception circuit of digital CR (VCR) device and its transmission method

1 is a hardware block diagram of a digital CR (VCR) implemented by the prior art.

2 is a hardware block diagram of a digital BC with a data transmission and reception circuit according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital video recorder (VCR), and more particularly, to a digital CD device and a data transmission method having a data transmission / reception circuit capable of transmitting and receiving data, such as image data, with an external device.

In general, a digital signal device is a device that converts an analog video signal input from the outside into a digital video signal and records and reproduces the same on a recording medium. In addition, the digital VR device includes a configuration for compressing and error correcting digital image data. The structure of such a digital BC device is shown in FIG. 1 as follows.

1 is a hardware block diagram of a digital CR (VCR) implemented by the prior art. In FIG. 1, a solid line is a path of a data stream, and a dotted line is an input / output path of a control signal. Looking at the operation of the conventional digital BC is configured as described above is as follows.

When an analog video signal is input from the outside to a digital signal device configured as shown in FIG. 1, the image signal is converted into digital image data by the operation of Analog to Digital Converter Digital to Analog Converter (A / DD / A) 12 and shuffled. Input to controller 14. The shuffle controller 14 formats the input digital image data in the form of a recording format of the digital VR device, and then shuffles it using the shuffle memory 16. When the shuffling is completed, the shuffle controller 14 transmits a shuffling completion signal to the DSP (Digital Signal Processor) 18.

The DSP 18 accesses the shuffling-completed image data from the shuffle memory 16 in response to the input of the shuffling completion signal, performs data compression on the shuffled data in accordance with a digital clock format, and then corrects an error correcting code. Send to section 20. The ECC unit 20 inserts the ECC in the unit of a sync block in accordance with the digital BC standard for the compressed image data transmitted from the DSP 18. Then, the compressed image data of one frame into which the ECC is inserted is rearranged using the ECC memory 22 in a track format order and then transmitted to the corresponding channel. In the case of reproduction, the above process is reversed.

Conventional digital BC devices having the above configuration use at least two external frame memories, such as shuffle memory 16 and ECC memory 22 shown in FIG. The shuffle memory 16 has a storage capacity for storing only one frame data, and the ECC memory 22 has a storage capacity for storing two frame data. At this time, in the shuffle memory 16, the addressing method is not the same every frame but has a cyclic sequence for each frame with many sequence structures. Since the ECC memory 22 has a storage capacity of two frames, data at the same location is always stored in the same address area.

Therefore, in order to transfer a still picture from the digital device to an external device by combining a serial interface device such as RS-232C with a conventional digital device having the above structure, a still picture corresponding to one frame may be stored. The frame memory must be provided separately.

Because the video signal inside the digital signal is processed at a high frequency rate (Rate), and the data transmission rate of the data interface such as RS-232C is very slow, so in addition to the shuffle memory in order to transmit still images of one frame to the outside, Not much memory had to be used indispensable. Therefore, in order to transmit still image data to an external device by adding an RS-232C interface to the digital BC as shown in FIG. 1, an additional memory must be added, thereby causing a problem in that hardware is increased more than necessary.

Accordingly, an object of the present invention is to provide a digital disk capable of transmitting still image data to an external device using a memory having a storage capacity of one video segment.

Another object of the present invention is a digital data transmission circuit and a control method thereof capable of efficiently transmitting one frame of image data using a small size of cover when transmitting image data to an external device using RS-232C. In providing.

The present invention for achieving the above object is connected to a servo means for controlling the playback mechanism in the still mode or the playback mode in response to a predetermined control signal, an ECC memory and a shuffle memory for storing image data for one frame and an external device. A data transfer circuit of a digital BC apparatus having RS-232C, comprising: writing / reading data picked up from a recording medium under control of the servo means to the ECC memory, and responsive to the data transfer mode signal; An ECC unit for storing and outputting one frame of still image data in a memory; a digital signal processor for extending and outputting data output from the ECC unit to the shuffle memory and simultaneously outputting a frame reference signal; write and read control Store and output decompression data output from the digital signal processor in response to a signal Memory control means for detecting recording of the memory by detecting a frame reference signal output from the digital signal processor by input of a data transfer mode signal and controlling reading of the memory in response to a data transfer request signal; And connected to an external device via the RS-232C to supply a data transfer mode signal from an external device to the control means, detect a data transfer request signal, and supply it to the memory control means and output from the memory. RS-232C control means for transmitting the data to the external device through the RS-232C.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings of the embodiments of the present invention, those having substantially the same configuration and function as those in the above-described drawings will use the same reference numerals.

2 is a hardware block diagram of a digital BC having a data transmission / reception circuit according to the present invention, which further includes means for transmitting data by an external device 24 and RS-232C in the configuration of FIG. It can be seen. Means for transmitting data using RS-232C is a memory 34 for storing data output from the DSP 18 in units of one video segment, and sequentially outputting the data in response to an output control, in response to the input of the frame reference signal. A memory controller 36 which controls data storage of the memory 34 and outputs the data stored in the memory 34 in response to a data request signal, and is connected to the external device 24 and the RS-232C 26 to detect a transmission mode signal from the outside; An RS-232C controller 28 for generating the data request signal and controlling the RS-232C with an external device 24, and a microprocessor for controlling the operation of the system by switching to a transmission mode in response to the transmission mode signal input.

(Microprocessor: MPU) 30 and the servo unit 32 which switches to still in response to the transfer mode control of the MPU 30. The servo unit 32 controls the driving of the digital BC mechanism by the control of the MPU 30.

Among the above configurations, the MPU 30 and the servo unit 32 are those built in the conventional digital BC, which is a function according to the present invention. That is, a function of switching the operation of the servo unit 32 to the still mode in response to the input of the external data transfer mode signal in software and releasing the still mode in response to the transfer completion signal is added. In the drawing of FIG. 2, datai (where i is a natural number such as 1,2,3,4, .n, etc.) is a data bus, and CTLi is a control signal line.

The memory 34 may use a memory having a small storage capacity, for example, an envelope having a storage capacity sufficient to store image data of one video segment.

Referring to the circuit of the present invention configured as shown in FIG. 2, the data transmission operation by the external device 24 and RS-232C 26 will be described below.

Now, when the data transmission mode signal is generated from the external device 24 shown in FIG. 2, it is supplied to the RS-232C control unit 28 through the RS-232C 24. At this time, the RS-232C control unit 28 detects the data transmission mode signal and supplies it to the MPU 30 through the line CTL7. The MPU 30 checks the operation status of the current digital BC system in response to the data transmission mode signal output from the RS-232C controller 28 and determines whether data transmission is possible. If it is determined that data transmission is possible, the MPU 30 supplies a transmission mode signal to the memory controller 36, the ECC unit 20, and the servo units 32 through the control lines CTL8, CTL9, and CTL12, respectively.

At this time, the servo unit 32 switches the operation mode to the still mode in response to the received signal from the MPU 30. By the still mode switching of the servo unit 32, the same data of the recording medium, that is, the still image data is repeatedly output. In addition, the ECC unit 20 receiving the data transmission mode signal outputs an ECC memory control signal through the control line CTL10 so that the same frame data is always output from the ECC memory 22. Data output from the ECC memory 22 is supplied to the ECC unit 20 through the data line data10.

If the still picture data output from the ECC unit 20 and output to the data line data4 are always the same data, the control signal output therefrom and output to the control line CTL4 is output in the same manner as the control signal in the normal state. Therefore, the operation of the DSP 18 connected to the ECC unit 20 has normal operation. In other words, it operates in an operation mode in which data is reproduced normally. At this time, the DSP 18 always outputs data of one frame by outputting data of the same block at the same time based on the frame reference signal output from the shuffle controller 14 to the control line CTL3.

The image data output from the DSP 18 is input to the shuffle memory 16 and deshuffled as usual, and the deshuffled image data is output to the outside through the A / D D / A 12. By this operation, the data output to the outside becomes a still image, which is displayed as a still image on an external monitor or the like.

A process of transmitting data to the external device 24 through the memory 34 shown in FIG. 2 while the still picture is displayed as described above will be described below.

The image data output to the data line data3 of the DSP 18 by the above operation is supplied to the shuffle memory 16 and to the memory 34 at the same time. The data storage size of the memory 34 is about one video segment, and may be smaller or larger than this. In this case, the control signal supplied from the DSP 18 to the memory control unit 36 through the control line CTL5 is a frame reference signal, and the memory control unit 36 stores data currently stored in the memory 34 in response to the input of the frame reference signal. Marks how much data is later.

By this operation, when the image data stored in the memory 34 is almost output through the RS-232C controller 28, the memory controller 36 outputs a write control signal through the control line CTL6 so that the next image data of the data currently stored is To be stored in memory 34.

The data stored in the memory 34 is output by the RS-232C controller 28 outputting a data request signal to the memory controller 36. For example, when the RS-232C controller 28 outputs a data request signal to the memory controller 36 through the control line CTL13, the memory controller 36 supplies a read control signal to the control line CTL6.

At this time, the memory 34 sequentially transmits the data stored therein to the RS-232C controller 28 in response to the read control signal output from the memory controller 36.

The RS-232C controller 28 for inputting data output from the memory 34 transmits the input image data to the external device 24 through the RS-232C 26.

When image data corresponding to one frame is transmitted from the memory 34 to the external device 24 by the above operation, the memory controller 36 outputs a transmission completion signal through the control line CTL8. In this case, the MPU 30 notifies the ECC unit 20 and the servo unit 32 of the completion of the transmission through the control lines CTL9 and CTL12 in response to the transmission completion signal output from the memory control unit 36. With the above configuration, RS-232C data transfer is performed using a memory 34 having a small capacity, thereby enabling data transfer between a digital BC device having a different data processing speed and an external device. As described above, it can be seen that data transmission is possible using not only RS-232C but also other transmission parts by the data rate adjustment operation.

As described above, the present invention can improve the function of the digital VR by transmitting still image data processed by the digital VR device to an external device using RS-232C using a memory having a small storage capacity.

Claims (2)

A digital BC including a servo means for controlling a playback mechanism in a still mode or a playback mode in response to a predetermined control signal, a shuffle memory for storing image data for one frame, and an RS-232C connected to an external device. In the data transfer circuit of the apparatus, the data picked up from the recording medium under the control of the servo means are written / read in the ECC memory, and one frame of still image data is stored in the ECC memory in response to a data transfer mode signal. A digital signal processor which expands and outputs the data outputted from the ECC, stores the data in the shuffle memory, and outputs a frame reference signal, and outputs the digital signal processor in response to write and read control signals. Memory for storing and outputting decompression data and input of data transfer mode signal Memory control means for detecting a frame reference signal output from the digital signal processor to control the recording of the memory, and controlling the reading of the memory in response to a data transmission request signal; and an external device through the RS-232C. Is connected between and supplies a data transfer mode signal from an external device to the control means, detects and supplies a data transfer request signal to the memory control means, and simultaneously outputs data output from the memory via the RS-232C. A data transmission circuit of a digital BC device comprising an RS-232C control means for transmitting to a device. The digital display device of claim 1, further comprising a microprocessor for supplying a transmission mode signal to the servo means and the ECC unit in response to an input of a data transmission mode signal output from the RS-232C control means. Data transmission circuit of the seed device.