KR0173737B1 - Replay method for data of camcorder using memory card - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

It is about a camcorder.

2. The technical problem to be solved by the invention

A memory card for facilitating high-speed search and reproduction of data recorded on a memory card and a method of data recording and reproducing in a camcorder using the same.

3. Summary of Solution to Invention

In recording and reproducing audio and video information on a memory card made of inactive memory, information on recorded video and audio is provided during playback, so that recorded video and audio signals can be easily read.

4. Important uses of the invention

Camcorders that use a memory card as a recording medium

Description

Data recording and playback method on a memory card and a camcorder using it as a recording medium

1 is an external perspective view of a camcorder using a memory card according to an embodiment of the present invention as a recording medium.

2 is a block diagram of a camcorder using a memory card according to an embodiment of the present invention as a recording medium.

3 is an overall memory area diagram of a memory card according to an embodiment of the present invention.

4 is a data recording control flowchart in the camcorder using the memory card according to the embodiment of the present invention as a recording medium.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camcorder capable of recording and reproducing video and audio signals on a recording medium, and more particularly, to a memory card produced by using a nonvolatile memory and a data recording and reproducing method of a camcorder using the same as a recording medium. .

Today, recording and reproducing products using memory cards continue to appear in the market. A good example would be a device that records each of video and audio signals to the memory card, such as a recorder, stereo player, still camera, and the like.

In the conventional reproducing apparatus for reproducing the recorded audio and video signals, since the signals are recorded in an analog manner using a magnetic tape, the recorded contents are easily deteriorated. Inconvenient problems such as difficulty in repetitive regeneration occurred.

Accordingly, an object of the present invention is to record a location information of the information to be recorded in a recording medium made of a non-volatile memory, recording the location information of the information to be separated from the audio and video information memory capable of high-speed playback and jump In providing the card.

It is still another object of the present invention to provide a data recording and reproducing method that can easily search and play desired video information and audio information by using position information recorded in a camcorder using a memory card made of a nonvolatile memory as a recording medium. In providing.

Memory card implemented to achieve the above object; A first index area in which the total number of chapters currently recorded is recorded, a second index area in which data obtained by adding up the time of each chapter currently recorded is recorded, and a third index area in which the start address of the corresponding chapter is recorded. And a fourth index area for recording the date and time when the chapter is recorded, a fifth index area for recording the recording time of the chapter, and a data area for recording video and audio data separated by the chapter. It is done.

In order to achieve the above object, the present invention provides a camcorder which uses a memory card as a recording medium and has signal input means, wherein each signal inputted from a video signal input means and an audio signal input means is inputted every time a data recording command is input. A first step of dividing and compressing, a second step of sequentially recording the compressed data and location information data corresponding to each chapter in different areas of the memory card; and at the input of a data reproducing command, the location information data It is characterized in that it comprises a third step of searching for a corresponding chapter to expand the compressed data of the searched chapter to output a video signal and an audio signal through the signal output means.

Hereinafter, the configuration and operation of a camcorder according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 shows an external perspective view of a camcorder using a memory card according to an embodiment of the present invention as a recording medium, and FIG. 2 shows a configuration diagram of a camcorder using a memory card according to an embodiment of the present invention as a recording medium. It is. 3 shows an entire memory area diagram of a memory card according to an embodiment of the present invention.

Referring to FIG. 1, a camcorder according to an embodiment of the present invention has a view finder for starting to identify a subject, and has a set of function keys for inputting a recording command, a playback command, and a stop command by a user's operation. It is formed on the upper surface. The memory card 30 according to the embodiment of the present invention has a structure that is inserted into the set from one side of the set. Referring to FIG. 2, a circuit diagram of this structure is described. First, the video-to-digital converter 80 converts a video signal input through a camera system as a video input means into digital data. The data is converted and output to the video memory 40. The audio signal input from the audio input means which is a microphone is converted into digital data by the audio A / D converter 90 and then input to the audio memory 50. The video memory 40 and the audio memory 50 are buffer memories used to synchronize input signals. On the other hand, the control unit 10 separates the digital data output from each of the memory (40, 50) by chapter each time the data recording command input, and compresses the compressed information and the recording position information sequentially into the memory card ( Generating a first control signal for recording in different areas (TOC area and data area) of 30), and outputting a second control signal for reproducing the relevant chapter by searching the recording position information when a data reproduction command is input; do.

Digital Singal Precessor (DSP) 20 compresses data input from the memories 40 and 50 and the controller 10 when the first control signal is input, and writes the data to the memory card 30. 2 Data input from the memory card 30 is expanded and outputted when the control signal is input. The data compression method used in the DSP 20 uses a video and audio compression algorithm employed in MPEG1 or MPEG2. As shown in FIG. 3, the memory card 30 is divided into a TOC (Table Of Content) area in which position information of recorded data is recorded and a data area in which input video and audio signals are compressed. The TOC area is divided as follows to divide the information recorded in the memory card 30 into chapters and to record the location information of the divided chapters. That is, the TOC area includes a first index area in which the total number of chapters currently recorded is recorded, a second index area in which data plus the sum of the times of the currently recorded information is recorded, and a start address of the corresponding center is recorded. And a third index area to be recorded, a fourth index area in which the date and time the chapter is recorded, and a fifth index area in which the recording time of the chapter is recorded.

Meanwhile, the video memory 45 and the audio memory 55 temporarily store the data output from the DSP 20 and then output the data to the respective D / A converters 60 and 70 under the control of the controller 10. The video D / A converter 60 and the audio D / A converter 70 convert the input data into analog signals and output them to the outside through the video output means and the audio output means, respectively.

4 shows a data recording control flowchart in a camcorder using the memory card 30 as a recording medium according to an embodiment of the present invention.

Hereinafter, the data recording process of the camcorder according to the embodiment of the present invention will be described with reference to FIGS. 2 to 4. First, an analog video signal input through a video input means when a recording key is input from a user. Is converted into a digital signal in the video A / D converter 80 and temporarily stored in the video memory 40. In this case, an analog audio signal input simultaneously with the video signal is converted into a digital signal by the audio A / D converter 90 and temporarily stored in the audio memory 40. Thereafter, when the controller 10 generates and outputs a first control signal, the DSP 20 compresses data input from the video memory 40 and the audio memory 50 based on a compression algorithm in response thereto. Output to memory card 30 to record.

Hereinafter, the process of recording the location information and the actual video and audio data in the TOC area and the data area divided in the memory card 30 will be described in detail. First, in step 100, the controller 10 detects whether a recording key is input. . If the recording key is input, the controller 10 proceeds to step 110 and increases the number of chapters in the TOC area by one. At this time, the total number of chapters currently recorded is recorded at 0000H of the TOC area, and the sum of the times of the respective chapters recorded in the 0001H address is recorded, and from 0002H to 00FFH, each pointer is a pointer to each location. Three addresses are assigned per chapter (first address: start address of the chapter, second address: date and time the chapter was recorded, and third address: time of the contents recorded in the chapter).

On the other hand, in response to the recording key input, the controller 10 increases the number of mutters in step 120, checks the current time including the date in step 120, records the address at the corresponding address, and proceeds to step 130, and the video and audio compressed in the DSP 20 are proceeded. Recording is performed to record data in the data area. In addition, the controller 10 checks the recording time by driving the timer in step 140. In addition, the controller 10 checks whether the recording time has elapsed for 15 minutes in step 150 and continuously checks whether there is a stop key input in step 160. If the recording time of 150 steps exceeds the preset 15 minutes, the control unit 10 returns to step 110 and repeats the above steps 110 to 160, and if the stop key is input 15 minutes before changing the shutter. When the controller 10 proceeds to step 170, the controller 10 records the recording time of the center in the fifth index area and returns to step 100. That is, according to the present invention, the signals inputted from the video signal input means and the audio signal input means are respectively separated by compression when the data recording command is input or when the preset recording time elapses, and correspondingly compresses the compressed data and the respective filters. Position information data are sequentially recorded in the memory card 30. And if there is a play key input from the user, the controller 10 searches the position information data to search for the corresponding chapter, and expands the compressed data of the found chapter to the DSP 20 for outputting to the outside. By outputting, it is possible to reproduce desired data.

As described above, the present invention records positional information data in a nonvolatile memory together with a center-determined audio signal and a video signal, thereby retrieving the recorded positional data when reproducing recorded data, thereby quickly searching recorded audio and video signals. There is an advantage to play.

Claims (4)

A data recording and reproducing method of a camcorder using a memory card as a recording medium, the method comprising: firstly compressing signals inputted from a video signal input means and an audio signal input means each time by each data recording command input; A second process of sequentially recording the compressed data and the position information data corresponding to each chapter differently from each other in the memory card; and searching the corresponding position by searching the position fixing data when a data reproducing command is input. And a third process of decompressing the compressed data of the extracted center and outputting the video data and the audio signal through the signal output means, respectively. A memory card for storing data, comprising: a first index area in which the total number of chapters currently recorded is recorded, a second index area in which data is added up by adding the time of each chapter currently recorded; A third index area in which the start address is recorded, a fourth index filtration in which the date and time the corresponding chapter is recorded, a fifth index area in which the recording time of the corresponding chapter is recorded, and video and audio data separated by chapter And a data area in which data is recorded. 2. The recording apparatus of claim 1, wherein the recording position information data; The first index information indicating the total number of records currently recorded, the second index information indicating the total recording time of the currently recorded chapter, the third index information indicating the start address of the relevant chapter, and the corresponding chapter And fourth index information indicating the recorded date and time, and fifth index information indicating the time of the contents recorded in the chapter. The method of claim 1, further comprising: a fourth process of automatically increasing the number of chapters and recording the location information data on the memory card when the recording time according to the data recording command input has elapsed. How to record and play back data on a camcorder.