KR20020078234A - Index information offering apparatus - Google Patents

Abstract

PURPOSE: An apparatus for providing index information is provided to reproduce and display index information in reproducing a tape recording a digital broadcast by recording index information with the digital broadcast, thereby easily selecting reproducing position. CONSTITUTION: An apparatus for providing index information includes an index screen extracting part(412) extracting an index screen from a digital signal of a broadcast signal processing part(401) for generating index information with absolute position information; an index information storing part(413) temporarily storing index information until the recording of a digital broadcast terminates; a record format converting part(403) converting index information into a digital record format in a recording operation for transmitting to a record/reproduction signal processing part(404), transmitting record data and index information detected at the record/reproduction signal processing part to a screen generating part(402) in a reproducing operation; an information recording part(411) recording an absolute position where a control signal and data are recorded, information related to data presently being recorded, with providing absolute position information of data presently being recorded in the recording operation, transmitting detected information to the screen generating part by detecting index information recorded at a tape in the reproducing operation to display a reproducing position selection.

Description

Index information providing device {INDEX INFORMATION OFFERING APPARATUS}

The present invention relates to a magnetic recording and reproducing apparatus, and more particularly, to an index information providing apparatus in a digital magnetic recording and reproducing apparatus.

As digital broadcasting has recently begun, various digital broadcasting recording and reproducing apparatuses have been developed and marketed.

As a conventional recording and reproducing apparatus, a magnetic recording apparatus mainly using a tape was developed by adding a digital recording and reproducing function for digital broadcasting.

1 is a block diagram of a conventional magnetic recording / reproducing apparatus for digital broadcast recording and reproduction. As shown therein, a broadcast signal processor 101 for reproducing a digital signal from an analog broadcast signal transmitted through an over-the-air broadcast or a cable broadcast. And reconstruct the digital signal transmitted from the broadcast signal processing unit 101 in accordance with the recording format for compatibility between devices to create the recording data, correct the error of the reproduction data during playback, and then convert the digital signal to the original digital broadcasting data. A reconstructed recording format processing unit 103, and at the time of recording, converts the digital data from the recording format processing unit 103 into a signal for recording on a magnetic tape, records them through the drum head, and reproduces the signals from the drum head during reproduction. A recording / reproducing signal processing unit 104 which is restored to the recording format processing unit 103 and transferred to the recording format processing unit 103; A screen generation unit 102 for analyzing and displaying a digital signal transmitted from the signal processing unit 101 or the recording format processing unit 103 on the TV screen for viewing and operation of the capstan for advancing the magnetic tape during recording and playback; and The servo unit 107 controls the operation of the drum head, and a control signal for synchronizing the drum head at the time of reproduction with the recorded track is recorded on the tape via the control head 108 and the control head (at the time of reproduction). A control signal recording unit 109 which transmits the control signal detected through the control unit 108 to the servo unit 107, a user interface unit 106 that provides an operation function to the user, and a transfer from the user interface unit 106. It consists of an internal control unit 105 for adjusting each of the internal parts according to the user selection.

Referring to Figures 2 and 3 the operation of the apparatus in the prior art as follows.

2 is an exemplary view showing a digital tape recording format, and FIG. 3 is a recording / reproducing waveform diagram of a control head corresponding to the drum head.

The broadcast signal processor 101 reproduces a digital signal from an analog broadcast signal transmitted through over-the-air broadcast or cable broadcast, and simultaneously transmits the digital signal to the screen generator 102 and the recording format processor 103.

The screen generating unit 102 interprets the digital signal from the broadcast signal processing unit 101 in the case of a broadcast viewing or recording operation, and interprets the digital signal transmitted from the recording format processing unit 103 in the case of a reproduction operation, and displays it on the TV screen. Make the user viewable.

In addition, the screen generation unit 102 operates in conjunction with the user interface unit 106 to display a menu selection screen on the TV screen so that a user can select a function.

The recording format processing unit 103 reconstructs the digital signal transmitted from the broadcast signal processing unit 101 during the recording operation in accordance with the recording format for compatibility between devices to make the recording data and cope with an error situation that may occur during playback. Data including not only digital broadcast data but also error correction data is generated.

In addition, the recording format processing unit 103 analyzes the data transmitted from the recording / reproducing signal processing unit 104 during the reproduction operation, corrects an error, restores the same digital broadcast data as the recording time, and delivers the same to the screen generation unit 102. .

The recording / reproducing signal processing unit 104 converts the digital data generated by the recording format processing unit 103 in a recording operation into a suitable signal for recording on a magnetic tape, records it through the drum head, and records the signal generated from the drum head in the reproducing operation. After the amplification, the digital signal is restored to the original digital signal through EQ signal processing or the like, and transferred to the recording format processing unit 103.

The control signal recording unit 109 records signals through the control head 108 to synchronize the drum head with the recorded tracks during playback during the recording operation, and detects the recorded control signals during the playback operation to detect the servo unit 107. To pass).

The servo unit 107 controls the drum head for accurate recording / reproducing of data while controlling the capstan for advancing the magnetic tape in the recording and reproducing operation.

In particular, the servo unit 107 controls the operation of the head drum and the capstan with reference to the control signal detected by the control head 108 during the reproducing operation, thereby synchronizing the digital track with the drum head shown in the example of FIG. Will be corrected.

In FIG. 2, the digital track is a portion in which digital information including digital broadcasting is recorded through the drum head, and the control track is a portion in which a signal for synchronizing the drum head is recorded through the control head 108 during reproduction.

The user interface unit 106 allows a user to select a function to operate the device from the outside.

In the internal controller 105, the broadcast signal processor 101, the screen generator 102, the recording format processor 103, and the record / playback signal processor 104 according to a user's selection transmitted from the user interface 106. ) And the control signal recording unit 109 to perform a stable recording / reproducing operation.

The recording operation and the reproduction operation will be described with reference to the above operation.

First, in the case of a recording operation, when the broadcast signal processing unit 101 reproduces a digital signal from an over-the-air broadcast or a cable broadcast and simultaneously transmits the digital signal to the screen generation unit 102 and the recording format processing unit 103, the screen generation unit 102 is digital. The recording format processing unit 103 reconstructs and converts the digital signal into a format that can be recorded on a magnetic tape, and converts the converted signal into a recording / playback signal processing unit 104. Writes to magnetic tape through the head.

In this case, the internal controller 105 controls the operations of the screen generating unit 102, the recording format processing unit 103, and the recording / reproducing signal processing unit 104 according to the user's selection function, and the servo unit 109 plays the drum. And the capstan are operated to advance the magnetic tape.

In addition, the control signal recording unit 109 records a signal synchronized with the drum head in the control track shown in FIG. 2 by using the recording current of the control head 108 as shown in FIG.

In the reproducing operation, the servo unit 107 operates the drum and the capstan motor such that the digital track and the drum head are synchronized using the control signal detected by the control head 108 in the control track.

That is, the servo unit 107 synchronizes the drum head and the digital track by adjusting the position of the drum head by using the reproduction voltage (+ voltage pulse) as shown in FIG. 3 (b) detected by the control head 108.

Accordingly, when the recording / reproducing signal processing unit 104 restores the signal transmitted from the head to the recording format processing unit 103, the recording format processing unit 103 undergoes error correction or the like to process the same as the original broadcast signal. The signal is transmitted to the screen generator 102, and the screen generator 102 displays the signal transmitted from the recording format processor 103 on the TV screen.

However, the magnetic recording apparatus for digital recording and reproduction in the prior art is suitable for digital broadcast recording, but when the user plays back the recorded digital broadcast, the user checks the information on the currently recorded broadcast content or the desired scene, that is, Since there is no means for reproducing at a desired position, there is a disadvantage in that the user cannot provide a simple operation function.

Accordingly, the present invention provides an index information providing apparatus created to increase the convenience of a user by recording information on the recorded data together with recording the digital data and providing the recorded information to the user while reproducing the conventional disadvantage. The purpose is to provide.

Another object of the present invention is to record information of record data in an index track so that the corresponding information can be searched by a device having an index processing function.

1 is a block diagram of a conventional magnetic recording / reproducing apparatus for digital broadcasting recording / reproducing.

2 is an exemplary view showing a recording method of a tape.

3 is a waveform diagram of a recording current and a reproduction voltage of the control head in FIG.

4 is a block diagram of an apparatus for an embodiment of the present invention.

5 is a write current waveform diagram of a control head in an embodiment of the present invention;

Figure 6 is a diagram of the regeneration voltage waveform of the control head in the embodiment of the present invention.

7 is an exemplary view showing a structure of a control code in an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

401: broadcast signal processing unit 402: screen generation unit

403: recording format processing unit 404: recording / playback signal processing unit

405: internal control unit 406: user interface unit

407: Servo unit 408: Control head

411: information recording unit 412: index screen extracting unit

413: Index information storage unit

In order to achieve the above object, the present invention provides an index screen extractor for extracting index screens to generate index information, and an index for temporarily storing index information generated by the index screen extractor until recording of digital broadcasting is completed. And an information storage unit for recording the control signal, the absolute position at which the data is recorded, and the information on the data currently being recorded, and an information storage unit, a recording format converter for converting the index information into a digital recording format. It is done.

The information recording unit provides absolute position information to the index screen extractor, and records information about the absolute position and the data currently being recorded in the user data of the control code and records the index information in the time data of the control code. do.

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

4 is a block diagram of an apparatus for an embodiment of the present invention, as shown therein, in the same manner as the conventional magnetic recording / reproducing apparatus for digital broadcasting recording and reproduction. ), A recording format processing unit 403, a recording / playback signal processing unit 404, an internal control unit 405, a user interface unit 406, a servo unit 407, and a control head 408. An index screen extracting unit which extracts index information to be used for reproduction from the digital output signal of the signal processing unit 401 and transfers the index information to the recording format processing unit 403 to record the extracted index information at the end of recording of the data ( 412, an index information storage unit 413 for temporarily storing the index information extracted by the index screen extraction unit 412, and a control signal as well as the absolute position of the currently recorded tape and the current digital track. And an information recording unit 411 for storing information on data being recorded in a control track using the control head 408.

If described with reference to Figures 5 to 7 the operation and effect of the embodiment of the present invention configured as described above.

Here, FIG. 5 is a waveform diagram of the recording current of the control head 408, FIG. 6 is a waveform diagram of the reproduction voltage of the control head 408 corresponding to the recording current of FIG. 5, and FIG. 7 is a control code recorded on the control track. An illustration showing the structure of.

That is, FIG. 5 is a recording current waveform diagram of the control head 408, which shows that the width of the N section is 60 + -5% for the '0' pulse and 27.5 + -2.5% for the '1' pulse.

6 is a voltage waveform diagram of the control head 408 at the time of reproduction corresponding to the recording current of FIG. 5, and shows criteria for determining '0' and '1' pulses.

7 is a diagram illustrating a structure of a control code using a control signal, which is divided into an 11-bit header, an 8-bit user data, and a 33-bit time code. The time code is a 19-bit time data, 4 It consists of a checksum of bits and a dummy of 10 bits.

The control code of this structure is repeatedly recorded at a period of about 2 seconds, and records the absolute position using time data and records whether the currently recorded information is digital broadcasting or index information using user data.

Here, the reason for using the control signal is to move fast after the index selection, because the control signal is a signal that can be restored during the fast forward / backward progress.

Therefore, in the case of the reproduction operation, the information recording unit 411 interprets the signal input from the control head 408 to determine whether it is digital broadcasting or index information, and transmits the current absolute position to the internal control unit 405.

Meanwhile, even in the embodiment of the present invention, the broadcast signal processor 401, the screen generator 402, the record format processor 403, the record / playback signal processor 404, the internal controller 405, and the user interface unit ( 406 and servo unit 407, the recording and reproducing operation is performed in the same manner as the conventional magnetic recording / reproducing apparatus shown in FIG.

Therefore, in the embodiment of the present invention, a detailed description of the general recording and reproducing operation will be omitted, and the operation will be described based on the information recording unit 411, the index screen extracting unit 412, and the index information storing unit 413.

In the recording operation, the index screen extractor 412 separates and extracts an index screen that can be used for playback on a digital broadcast input, and temporarily stores the separated index screen in the index information storage unit 413.

As an index screen configuration method, an input screen may be extracted at a predetermined predetermined time, or the screen may be extracted and used as an index screen by including information indicating a separate index screen in digital broadcasting.

At this time, the position on the tape of the index to be recorded uses absolute position information generated by the information recording unit 411.

The index screen extractor 412 that performs the above functions may be configured to create a more convenient user environment by replacing not only a screen but also a device capable of extracting additional information included in digital broadcasting.

By the way, although the digital broadcast in the broadcast signal processing unit 401 is transmitted to the recording format processing unit 402 through the index screen extracting unit 412, the recording format processing unit from the broadcast signal processing unit 401 as in the prior art. It may also be configured to be forwarded directly to 403.

The index information storage unit 413 is a function block for temporarily storing the digital broadcast currently being recorded until recording the information such as the index screen necessary for the index function after the completion of recording, and various recording media such as HDD or DRAM. Can be used and the detailed configuration of the index information can be determined according to the capacity of the recording medium.

In addition, the index information storage unit 413 may use a method of storing separate index information for each tape by adding an identification number to each tape without erasing the temporarily stored contents, or as a separate external device without including them in the same set. It can also be configured.

The information recording unit 411 records not only the existing control signal but also information that can determine whether the absolute position of the tape currently being recorded and the information recorded in the current digital track are digital broadcast or index information.

The control signal is for synchronizing the head drum 409 with the digital track and uses only the + pulse of the reproduction voltage.

Accordingly, by modulating and recording the width of the N section of the recording current of the control head 408 during recording, it is possible to record the digital signals of '0' and '1' with the waveform as shown in Fig. 5 (a) (b).

Therefore, the recording and reproducing operation of the index information will be described with reference to the above operation.

First, in the case of a recording operation, the index screen processor 412 separates and extracts only the index screen currently included in the digital broadcast while delivering the digital broadcast transmitted from the broadcast signal processor 401 to the recording format processor 402.

At this time, the recording format processing unit 402 transmits the control signal and the absolute position from the information recording unit 411 to the index screen processing unit 412.

Accordingly, the index screen processing unit 412 generates index information using the index screen, the control signal, the absolute position, and the like, and transmits the index information to the index information storage unit 413 until the current data recording is completed on the digital track. It will be temporarily saved.

At this time, the information recording unit 411 records information indicating that the digital broadcast is in the user data of the control code as shown in FIG. 7, and records the absolute position of the current recording position on the control track using the control head 408. .

After the data recording is completed in the digital track, the internal controller 405 controls the screen generator 402 to display index information on the TV screen while controlling the index screen extractor 412 to store index information. The index information stored in the unit 413 is transmitted to the recording format processing unit 403.

Therefore, the index information is converted into the recording format by the recording format processing unit 403 and then recorded on the tape by the recording / reproducing signal processing unit 404, and the information recording unit 411 indicates that the index information is displayed in the user data of the control code. Keep track of your absolute position.

Thereafter, when the index information stored in the index information storage unit 413 is recorded on the mode tape, the recording operation is stopped.

Therefore, the tape recording amount is the sum of the recording time of digital broadcasting and the recording time of index information.

In addition, when the index information is to be displayed on the TV screen while the playback operation is started, the information recording unit 411 finds the portion where the index information is recorded in the control track as the user advances the tape forward and backward at high speed.

Thereafter, when the index position is found, the information recording unit 411 detects the index information and transmits the index information to the screen generation unit 402. The screen generation unit 402 displays the playback position selection screen using the index information on the TV screen. .

Therefore, when the user selects the playback position, the servo unit 407 moves to the absolute position corresponding to the selected position, and the recording / playback signal processing unit 404 starts playback from that position, and the recording format processing unit 403 The screen generator 402 displays the recorded broadcast on the TV screen.

That is, in the present invention, the index screen is displayed through the screen generator 402 so that the user can easily select a playback position.

As described in detail above, the present invention records index information for the digital broadcast while recording the digital broadcast on a tape, thereby reproducing the index information during the playback operation, and displaying an index screen so that the user can easily select a playback position. There is an effect of increasing the convenience.

In addition, the present invention has an effect of further improving the convenience of the user by enabling the use of the index function even when the device conversion by recording the index information directly on the tape.

Claims (3)

A magnetic recording / reproducing apparatus for recording and reproducing digital broadcasting, comprising: index screen extracting means for extracting an index screen from a digital signal of a broadcasting signal processing means and generating index information together with absolute position information; Index information storage means for temporarily storing the index information generated by the index screen extracting means until it is finished, converting the index information into a digital recording format during a recording operation, and transferring the index information to a recording / reproducing signal processing means, and Recording format converting means for transferring the recording data and the index information detected by the recording / reproducing signal processing means to the screen generating means, and providing the absolute position information of the data currently being recorded to the index screen extracting means during the recording operation, Absolute position of data and data currently being recorded And an information recording means for recording the control code including information in the control track and detecting the control code from the control track and transmitting the control code to the screen generating means for displaying the playback position selection screen during the playback operation. Informational device. The control code of claim 1, wherein the control code includes a header, user data for recording whether the data currently being recorded is digital broadcast or index data, and a time code for recording absolute position information of the data currently being recorded. Index information providing apparatus, characterized in that made. The apparatus of claim 1 or 2, wherein the control code is repeatedly recorded at a predetermined period.