KR100261801B1 - Recording conversion system of dvcr - Google Patents

Abstract

PURPOSE: A recording conversion system of a DVCR(Digital Video Cassette Recorder) is provided to classify HD(High Definition) TV signals into HP(High Priority) data and LP(Low Priority) data, and to record all the HD and the LD data in an S(Super)-VHS tape, then to record the HD data only in a normal VHS tape. Therefore, the HD TV signals are recorded regardless of the normal-VHS tape or the S-VHS tape. CONSTITUTION: A data separator(1) receives HD(High Definition) TV signals to a start code and an end code of I-frame data, and extracts the I-frame data only. A switch(2) selects the HD TV signals or selects the I-frame data(HP(High Priority) data). A data formatter(3) formats the I-frame data and P-frame data, or inserts dummy data to maintain a half ratio of original data by inputting the I-frame data only, then formats the dummy data. An amplifier(4) amplifies output data of the data formatter(3) with a level appropriate for recording the output data in a tape(5). A tape decider(6) confirms whether a mounted tape is a normal-VHS tape or an S-VHS tape, and outputs a mode selection signal to each system unit. A clock generator(7) generates a clock signal having a predetermined period necessary in a system. A divider(8) 2-divides the clock signal. A switch(9) selects an output signal of the clock generator(7) or the clock signal of the divider(8), and supplies the selected signal to the data separator(1) and the data formatter(3).

Description

DVR Real Record Conversion System

Fig. 1 is a block diagram of a record conversion system of a DVC of the present invention.

2 is another exemplary embodiment of the present invention.

3A is an explanatory diagram showing a track composed of I frame data and P frame data.

b is explanatory drawing which showed the track comprised only by I frame data.

* Explanation of symbols for main parts of the drawings

1: Data Separator 2,9: Switch

3: data formatter 4: amplifier

5: tape 6: tape discriminator

7: clock generator 8: divider

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a technology that enables recording of HDTV signals on both S-VHS tapes and normal tapes. In particular, the present invention relates to high priority signals. The data is classified into data and low priority data to record both the high priority data and the low priority data in the case of S-VHS tape, and to record only the high priority data in the case of normal-VHS tape. To a conversion system.

In general, the frequency characteristics of S-VHS tapes and normal-VHS tapes differ. In other words, S-VHS tape can handle about 7 ~ 8MHZ, so etchive can record all signals, while normal-VHS tape can only handle 4 ~ 5MHZ, so bandwidth is not enough for etchive to record all signals. Do.

In a general recording system, as described above, there is a defect that the etchive cannot record a signal on a normal-VHS tape because it cannot adequately cope with a change in bandwidth according to frequency characteristics.

In order to solve such a conventional defect, the present invention classifies an etched signal into high priority data and low priority data, and in the case of an S-VHS tape, records both high priority data and low priority data, and normal-VHS tape. In this case, the deterioration of the image quality is to some extent, and only the high priority data is recorded so that the etchive can record the signal on the normal-VHS tape, which will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of the DV conversion recording conversion system of the present invention. As shown therein, a start code is provided at the beginning of I frame data (HP data: High Priority Data) by receiving an HDTV signal. A data separator (1) extracting only I frame data by decoding the end code at the end of the and ends, and I frame data (HP Data) and P frame data (LP Data: Low Priority) under the control of the tape discriminator (6). switch 2 for selecting an HDTV signal or I frame data HP data output from the data separator 1, and formatting the output data of the switch 2; Under the control of the tape discriminator 6, if both the I frame data and the P frame data are inputted from the switch 2, they are formatted as they are. A data formatter 3 for inserting and formatting dummy data so as to be retained, an amplifier 4 for receiving the output data of the data formatter 3 and amplifying the dummy data to a level suitable for recording on the tape 5, and a cassette. A tape discriminator 6 which detects a hole and checks whether the mounted tape is a normal-VHS tape or an S-VHS tape, and outputs a mode selection signal according to the system, is controlled by the tape discriminator 6 A clock generator 7 for generating a clock signal of a predetermined period required by the signal generator; a divider 8 for dividing a clock signal output from the clock generator 7; and a control of the tape discriminator 6. And a switch 9 for selecting the output signal of the clock generator 7 or the clock signal of the divider 8 and supplying it to the data separator 1 and the data formatter 3. Function of the present invention And the effect will be described in detail as follows.

The tape is mounted on the deck system, and the HDTV of I frame data (HP Data) and P frame data (LP Data) is directly supplied to the fixed terminal (b ₁ ) of one side of the switch (2). In addition, in the state input to the data separator 1, the tape discriminator 6 detects a specific hole provided in the cassette and checks whether the currently mounted tape is a normal-VHS tape or an S-VHS tape, and accordingly a control signal. Are output to the switch (2), data formatter (3), amplifier (4), clock generator (7) and switch (9).

When the tape mounted as a result of the discrimination of the tape discriminator 6 is an S-VHS tape, the switch 2 is short-circuited to the fixed terminal b ₁ by an output signal of the tape discriminator 6, , The switch 9 is short-circuited to the fixed terminal b ₂ . Accordingly, an etch shift signal (HDTV) including I frame data (HP Data) and P frame data (LP Data) is supplied to the data formatter 3 through the contacts b ₁ and a ₁ of the switch 2. After formatting, it is amplified to an appropriate level via amplifier 4 and recorded on tape 5.

However, when the tape mounted as a result of the discrimination of the tape discriminator 6 is a normal-VHS tape, the switch 2 is short-circuited to the fixed terminal b ₁ by an output signal of the tape discriminator 6, The switch 9 is short-circuited to the fixed terminal b ₂ .

Accordingly, the data separator 1 extracts only the I frame data by decoding the start code at the beginning and the end code at the end of the I frame data using the divided clock signal supplied from the switch 9. This is supplied to the data formatter 3 via the contacts b ₁ , a ₁ of the switch 2.

Then, the data formatter 3 inserts and formats dummy data so that the input I-frame data can maintain a ratio of 1/2 of the original data, which is recorded on the tape 5 through the amplifier 4.

2 shows another embodiment of the present invention which is applied to extend the recording time. As shown in FIG. 2, the start code at the beginning of the I-frame data (HP Data) is supplied with the etch shift signal (HDTV). And a data separator 11 for extracting only the I frame data by decoding the end code at the end and the end code, and I frame data (HP Data) and P frame data (LP Data) under the control of the recording time control unit 16. A switch 12 for selecting an etchive signal (HDTV) or for selecting I frame data (HP Data) output from the data separator (11), and in formatting the output data of the switch (12), the recording Under the control of the time controller 16, if both the I frame data and the P frame data are inputted from the switch 12, they are formatted as they are. If only the I frame data is input, the ratio of 1/2 of the original data is maintained. A data formatter 13 for inserting and formatting the dimmer data, an amplifier 14 for amplifying the output data of the data formatter 13 to a level suitable for recording it on the tape 15, and the recording. A mechanism controller 17 for controlling a mechanism including a capstan motor to change the recording time under the control of the time controller 6, and a clock of a predetermined period required by the system under the control of the recording time controller 16; A clock generator 18 for generating a signal, a divider 19 for dividing a clock signal output from the clock generator 18, and the clock generator 18 under the control of the recording time controller 16; It is composed of a switch 20 which selects an output signal or a clock signal of the divider 19 and supplies it to the data separator 11 and the data formatter 13. Described in detail with reference to Figure 3 in conjunction with the accompanying effect as follows.

In general, the recording time of a digital VLC using a VHS tape is 2 hours, but if the recording time is to be extended, the track width should be reduced, but if the track width is reduced, the recording frequency will be limited. In view of this, the degradation of image quality is tolerated slightly, and the screen is composed only of I frame data.

In other words, both I-frame data and P-frame data are required to maintain high image quality, but the screen is composed using only I-frame data. Therefore, instead of narrowing the track for long time recording, only the I-frame data is extracted from the HDTV. This will be described in detail below.

When the EHD signal is directly supplied to the fixed terminal b ₁ of the switch 12 and input to the data separator 11, the user sets the table recording mode, and at this time, the recording time The switches 12 and 20 are short-circuited to the fixed terminals b ₁ and b ₂ by the control signal output from the controller 16, and the mechanism controller 17 is in the standard recording state. Is set.

Accordingly, an etch shift signal (HDTV) including I frame data (HP Data) and P frame data (LP Data) is supplied to the data formatter 13 through the contacts b ₁ and a ₁ of the switch 12. After formatting, it is amplified to an appropriate level via amplifier 14 and recorded in the track of tape 15 as in FIG. 3a.

However, when the user sets the standard recording mode, the switches 12 and 20 are short-circuited to the fixed terminals C ₁ and C ₂ , respectively, by the control signal output from the recording time controller 16. The controller 17 is set to the standard recording state.

Accordingly, an etch shift signal (HDTV) consisting of the I frame data (HP Data) and the P frame data (LP Data) is supplied to the data separator 11, and the data separator 11 is supplied from the switch 20. By using the divided clock signal, only the I frame data is extracted by decoding the start code at the beginning and the end code at the end of the I frame data, which are the contacts C ₁ and a ₁ of the switch 12. It is supplied to the data formatter 13 through.

Then, the data formatter 13 inserts and formats dummy data so that the input I-frame data maintains a ratio of 1/2 of the original data, which is inputted to the track of the tape 15 through the amplifier 14. Recorded as in 3b.

As described in detail above, the present invention enables separate I-frame data and P-frame data to be used as needed, so that an etchive signal can be recorded regardless of a normal-VHS tape or an S-VHS tape. -With the VHS tape installed, the user can configure the screen with only I frame data or the screen with P frame data to provide more services to the user as the user requests standard recording or long time recording. There is.

Claims (2)

Data separator (1) and tape discriminator (6), which receives the signal and decodes the start code at the beginning of the frame data and the end code at the end to extract only I frame data. The switch 2 for selecting an etched signal (HDTV) or the I frame data (HP Data) output from the data separator 1 and the output data of the switch 2 are supplied with an I frame. A data formatter 3 for formatting data and P-frame data as it is or inserting and formatting dummy data so as to input only I-frame data to maintain a ratio of 1/2 of the original data, and output data of the data formatter 3 The amplifier 4 receives the amplification to an appropriate level for recording it on the tape 5, and detects whether the cassette is mounted with a normal-VHS tape or an S-VHS tape. A tape discriminator 6 for outputting a mode selection signal to each system part, and a clock generator 7 for generating a clock signal of a predetermined period required by the system under the control of the tape discriminator 6. ), A divider 8 for dividing the clock signal output from the clock generator 7, and an output signal or divider 8 of the clock generator 7 under the control of the tape discriminator 6. And a switch (9) which selects a clock signal of and supplies it to the data separator (1) and the data formatter (3). Data separator 11 for extracting only I-frame data by decoding the start code at the beginning of the I-frame data (HP Data) and the end code at the end by receiving the HDTV signal, and a recording time control unit. A switch 12 for selecting an etch shift signal (HDTV) under the control of (16) or for selecting I frame data (HP Data) output from the data separator (11), and output data of the switch (12); Under the control of the recording time control unit 16, format I frame data and P frame data as they are, or format only I frame data, but insert and format dummy data so as to maintain a ratio of 1/2 of the original data. A data formatter 13, an amplifier 14 which receives the output data of the data formatter 13 and amplifies it to a level suitable for recording on the tape 15, and the recording time. A mechanism controller 17 for controlling a mechanism including a capstan motor to convert a recording time under the control of the controller 6, and a clock signal of a predetermined period required by the system under the control of the recording time controller 16; A clock generator 18 for generating a signal, a divider 19 for dividing the clock signal output from the clock generator 18, and a control unit of the clock generator 18 under the control of the recording time controller 16; And a switch (20) which selects an output signal or a clock signal of a divider (19) and supplies them to the data separator (11) and the data formatter (13).