KR0165245B1 - Tv broadcasting format transformation apparatus - Google Patents

Abstract

The present invention relates to a television broadcasting system converter.

The present invention converts the first television broadcasting method for transmitting the first total scan line and the first constant number field per unit time and the second television broadcasting method transmitting the second total scan line and the second constant number field per unit time. A first conversion mode for converting the first television broadcasting method into the second television broadcasting method, and a second conversion mode for converting the second television broadcasting method into the first television broadcasting method. A television broadcasting system converting apparatus comprising: a first selection switch for selectively selecting a digital video signal input in a second conversion mode and a field converted signal by a field conversion section in a first conversion mode, and input in a first conversion mode; A second selection switch for selectively selecting the line-converted signal by the line conversion unit in the second conversion mode, and the line-converted signal in the first conversion mode In the second conversion mode, there is an effect of converting a desired broadcast method to a broadcast method around the world, including a third selection switch for selectively selecting and finally outputting a field-converted signal, thereby simplifying the circuit. have.

Description

TV Broadcasting Inverter

1 is a diagram for explaining a television broadcasting system converting apparatus in a general first converting mode.

FIG. 2 is a diagram for explaining a television all-broadcasting conversion apparatus in the general second conversion mode.

FIG. 3 is a diagram for explaining a television broadcasting system switching device in a general third conversion mode. FIG.

4 is a view for explaining an embodiment of a television broadcasting system conversion apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

100: system control unit 101: control command generation unit

110: A / D converter 120: clock generator

130: line memory 140: line conversion unit

150: weight generator 160: video RAM

170: address generator 180: memory controller

190: D / A converter SW1-SW3: Switch for first to third control

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television broadcasting system converting apparatus, and more particularly, to a television broadcasting system converting apparatus that can cope with television systems of various countries of the world.

Since the conventional home video cassette recorder corresponds to the standardized TV system broadcasted in each country, it has not been possible to play or record video tapes of other broadcasting methods.

Therefore, a device capable of converting between different television systems has been developed, which is called a world wide video cassette recorder (hereinafter referred to as a VCR).

Current VCRs correspond to five inputs of NTSC, PAL, SECAM, PAL-N, and PAL-M, and six outputs of NTSC, PAL, SECAM, PAL-N, PAL-M, and NTSC 4.43MHz. Therefore, there are a total of 30 input / output relationships. Digital inputs such as STILL, STROBO, and SLOW are added to each input and output method. Here, the memory for storing the image data in storing the image data and converting the TV signal and the VCR signal to another broadcasting method is limited, so that only two fields of NTSC are stored, and the memory for storing the image data as the input / output differs. Since the capacity of is also different, the cost is increased due to unnecessary waste of memory.

This will be described in detail below.

First of all, NTSC and PANL-M (including NTSC 4.43MHz) are bundled in the same way with similarity of 525 lines / field, 60 fields / second, and PAL, SECAM, PANL-N are 625 lines / field. If you combine them in the same way with field / second similarity, you can control them with the following two switching methods.

Here, the first television method is called NTSC, PAL-M, NTSC 4.43MHz, and the second television method is called PAL, PAL-N, SECAM, and converting the first TV method from the first TV method to the second TV method. The second conversion mode is called a mode, and the conversion from the second television method to the first television method is called a second conversion mode, and the conversion from the first television method to the first television method and the second television method to the second television method is called a third conversion mode. Let's define the conversion mode.

In order to convert the signal of the first television broadcasting system into the signal of the second television broadcasting system, that is, in order that the inputs of NTSC and PAL-M correspond to the PAL, PAL-N, and SECAM outputs, six input / output relationships are required.

As shown in FIG. 1, the television broadcasting in the first conversion mode converting the television broadcasting system of the same type as the NTSC system (the first television broadcasting system) into the television broadcasting system of the same type (the second television broadcasting system) of the PAL system. The method converter is illustrated and briefly described as follows.

A first television broadcast signal (hereinafter referred to as a first TV signal) introduced from the A / D converter 11 is converted into a digital signal.

The field converting section 12 converts the 60 fields into 50 fields. For this purpose, the last one of the six fields of the original signal is skipped and the six fields are replaced with five fields.

When read from the video RAM of the field converter 12, a synchronization signal generator (not shown) for generating synchronization of a second television broadcast signal (hereinafter abbreviated as a second TV signal) of 625 lines and 50 fields / second. Read in accordance with the motivation.

The read signal is stored in the line memory 13 in line units, and the line converter 14 converts the signal of 525 lines into the signal of 625 lines.

That is, a weight of 1.2 is given to one line of the 525 lines, and a line is applied to the 625 line to be converted to apply a percentage to the 1H delayed signal and the current signal, respectively, to form one line.

The D / A converter 15 converts the signal output through the line converter 14 into an analog signal form and finally outputs the analog signal.

FIG. 2 shows a TV broadcasting system converting apparatus of a second conversion mode for converting a second TV signal into a first TV signal.

The A / D conversion unit 21 injects the second TV signal, converts it into a digital signal form, and outputs it to the line memory 122.

When converting 625 lines to 525 lines, the line converting unit 23 weights 0.833 to one line of the 625 lines, and applies one percentage to the 525 line side to which the 1H delayed signal and the current signal are applied. Make it.

When converting 50 fields into 60 fields, the field converter 24 converts 625 lines from the line converter 23 into 525 lines, and then converts them to the video RAM in synchronization with the registered signal of the original video signal (first TV signal). When writing and reading, it reads out in accordance with the synchronization signal of the synchronous signal generator which produces | generates the synchronous signal of the 1st TV signal of 525 lines and 60 fields / sec. That is, one field required in the process of converting from 5 fields to 6 fields is set to 6 fields by repeatedly reading the 5th field.

The D / A converter 25 converts the signal output through the field converter 24 into an analog signal for final output.

As shown in FIG. 1, A / D conversion ⇒ line conversion ⇒ field conversion (video RAM) ⇒ D / A conversion are performed when converting a 60 Hz or 525 line signal into a 50 Hz or 625 line signal.

As shown in FIG. 2, A / D conversion ⇒ field conversion (video RAM) ⇒ line conversion ⇒ D / A conversion are performed when converting a 50 Hz or 625 line signal to a 60 Hz or 525 line signal.

In this case, the reason that the line conversion and the field conversion are different in the first conversion mode and the second conversion mode is that it is easy to change from many lines to few lines when converting lines, but it is difficult to reverse them. Video RAM always contains only 525 lines of signal, which can reduce memory capacity.

In other words, changing from one scan line to a few scan lines in real time can be done in real time, but when switching from a few scan lines to a large number of scan lines, an input signal should be input slowly. This is only possible with (video RAM).

3 is a TV broadcasting system converting apparatus in a third conversion mode for converting a first TV signal into a first TV signal or a second TV signal into a second TV signal, as shown in FIG.

The first or second TV signal input from the A / D converter 31 is converted into a digital signal and stored in the video RAM 32. The data stored in the video RAM 32 is converted into an analog signal form by the D / A converter 33.

In this case, in order to perform a special playback function such as slow, still, and strobe, it must pass through the video RAM 32.

The slow function allows the tape movement speed to be changed at a later speed than normal playback, so that the movement of the picture on the screen is later than normal playback, and writes to the video RAM 32 according to the slow pulse signal generated by a microcomputer (not shown). .

The still function stops the tape running and the video head rotates normally to obtain a still picture (still picture), and only writes to the video RAM 32 once.

The stroboscopic function is a function that appears to be continuously displayed for one screen with a predetermined number (here 32) of periods and appears to be broken. The strobe function is written to the video RAM 32 at regular intervals.

Thus, as shown in FIGS. 1 to 3, an apparatus capable of mutually converting a television broadcasting system corresponding to each conversion mode at the same time may be used for each broadcasting system in order to record each broadcasting system in Matsushita, Japan. The recording / playback apparatus (model name NV-W1) provided with the deck corresponding to each method of the corresponding signal processing part was disclosed.

For specific technical details, see Nation Technical Report Vol. 37 Jun, 1991.

However, in this case, since the signal processing board and the corresponding deck for each broadcasting method are installed, the circuit becomes complicated and the price is expensive.

SUMMARY OF THE INVENTION In order to overcome the above problems, an object of the present invention is to provide a television broadcasting system converting apparatus capable of supporting not only television systems of various countries in the world, but also corresponding television systems in digital special function reproduction.

In order to overcome the above object, the apparatus for converting a television broadcasting system according to the present invention includes a first television broadcasting system and a second total scanning line transmitting a first total scan line and a first predetermined number of fields per unit time, and a second predetermined unit per unit time. A first conversion mode and a second television, provided with a line conversion means and a field conversion means for mutually converting the second television broadcasting method transmitted in a number of fields, and converting from the first television broadcasting method to the second television broadcasting method. In a television broadcasting system converting apparatus having a second conversion mode for converting from a broadcasting system to a first television broadcasting system,

First selection means for selectively selecting a digital image signal input in a second conversion mode and a signal converted by the field conversion means in a first conversion mode;

Second selection means for selectively selecting a digital image signal input in a first conversion mode and a signal converted by the line conversion means in a second conversion mode;

And third selection means for selectively selecting the line-converted signal in the first conversion mode and finally outputting the field-converted signal in the second conversion mode.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the television broadcasting system conversion apparatus according to the present invention.

4 is a circuit diagram according to an embodiment of a television broadcasting conversion apparatus according to the present invention.

The present invention provides system control means (100) for determining a conversion mode in which way to convert a current input signal;

The control command generation unit 101 which receives the data DATA, the clock CLOCK, and the strobe signal STROBE from the system control means 100 and outputs the first and second control signals CON1 and CON2 according to the conversion mode. Wow,

An A / D converter 110 for converting an input TV signal into a digital signal;

A first clock generator 121 for generating a clock signal of a first television broadcasting system; a second clock generator 122 for generating a clock signal of a second television broadcasting system; and a first or second clock generator according to a conversion mode control signal; A clock generator 120 comprising a fourth selection switch 123 for selecting outputs of the 121 and 122,

A line memory 130 for storing the output of the A / D converter 110 in line units according to the output clock of the clock generator 120;

A line converting unit 140 converting the line into a line corresponding to the first or second television broadcasting system;

A first coefficient generator 151 for generating a coefficient according to a weight for converting from the total scan line of the first television broadcasting system to the total scan line of the second television broadcasting system, and the first coefficient in the total scan line of the second television broadcasting system. A second coefficient generator 152 for generating a coefficient according to a weight for converting to a total scan line of a television broadcasting system, and a fifth selection switch for selecting an output of the first or second coefficient generators 151 and 152 according to a conversion mode ( 153, the weight generator 150,

A field converting unit (160) configured of video RAM for storing field units for converting into a field of a first or second television system;

A first field selection control signal for discriminating the first TV signal and the odd / excellent field, a synchronous signal for the first TV signal, a second field selection control signal for discriminating the odd / excellent field of the second TV signal, a second TV signal According to the field selection control signal selected by the sixth selection switch 172 and the sixth selection switch 172 which selects the signal output from the synchronization signal generator 171 which generates the synchronization signal An address generator 170 comprising an address generator 173 for generating an address and outputting the address to the video RAM 160;

A memory controller 180 which controls data writing and reading of the line memory 30 and the video RAM 160;

The second selection switch SW2 for selecting the output signal of the A / D converter 110, the output signal of the line converter 140, or the signal read out from the video RAM 160 to select the line converter 140. A third selection switch SW3 for selecting an output signal of the first selection switch SW1, an output signal of the A / D converter 110, an output signal of the line converter 140, or an output signal of the video RAM 160. )Wow,

And a D / A converter 190 for converting the path switched by the third selection switch SW3 into an analog signal form.

Next, the operation of FIG. 4 will be described in detail.

Referring to FIG. 4, when the first or second TV signal is input, the A / D converter 110 converts the digital signal into a digital signal form.

Here, the first or second TV signal input to the A / D converter 110 is a signal input after being divided into a luminance signal and a color difference signal.

When the signal input to the A / D conversion unit 10 is to be converted into the first conversion mode, the system control means 100 recognizes the first conversion mode and corresponds to the data DATA, the clock signal CLOCK, The strobe signal STROBE is output to the control command generation unit 101.

In the control command generation unit 101, the first control signal CON1 outputs a high signal in the first conversion mode or the third conversion mode and a low signal in the second conversion mode, and in the first conversion mode. When the high signal is in the second conversion mode and the third conversion mode, the second control signal CON2 for outputting the low signal is output.

First, in the first conversion mode, the first selection switch SW1 is shorted to the second selection contact 1 indicating high by the first control signal CON1, and the selection control switch SW2 is connected to the first. The selection control switch SW3 is short-circuited to the second selection contact 1 indicating high by the control signal CON1, respectively, and the selection control switch SW3 is short-circuited by the second control signal CON2. .

The signal processing flow according to this is as follows.

The output signal of the A / D converter 110 is stored in the video RAM 160. In the video RAM 160, when the 60 fields are converted into 50 fields, the last one of the six fields of the original signal (the first TV signal) is skipped without writing, and the six fields are replaced with the five fields to be the second TV signal. Convert. When reading from the video RAM 160, the reading is performed in synchronization with the synchronization signal of the second TV signal.

That is, in order to change the 60 fields into 50 fields, the second TV signal is generated by the six fields of the first TV signal and the synchronization signal generated by the synchronization signal generator 171 as they are reset every six periods of the input vertical synchronization signal. The five fields of are synchronized.

In addition, since the sixth field must be made five, the sixth field of the input is not written, and the odd / excellent field discrimination signal is generated by the synchronization signal generator 171 and outputted to the video RAM 160. Image shake is prevented by matching the odd / excellent field of the signal and the even / odd field of the second TV signal of the output.

The control of the video RAM 160 operates in synchronization with the vertical synchronization signal of the input signal and the write horizontal synchronization signal, and the reading is always synchronized with the read vertical synchronization signal and the read horizontal synchronization signal of the synchronization signal generator 171. It is supposed to work.

This means that when the fields are read in duplicate, there is a point in time when the video signal repeated in even and odd becomes even / excellent or odd / odd. In this case, the synchronization signal generator 171 of the system control means 100 It receives the even / odd signal as an input and generates a synchronization signal.

After the field conversion is performed in this way, the output of the video RAM 160 is stored in the line memory 130 according to the clock generated by the clock generator 120 through the first selection switch SW1 and then the line converter 140. Line conversion from.

The clock of the first TV signal generated by the first clock generator 121 is 5.7 µSEC from the rising edge of the horizontal synchronization signal to the time when the effective image signal is transmitted. After this 5.7 µSEC, the first clock is generated. .

The clock of the second TV signal generated by the second clock generator 122 is 6.8 µSEC from the rising edge of the horizontal synchronization signal to the time when the effective image signal is transmitted, and the second clock is generated after 6.8 µSEC.

The fourth selection switch 123 selects an output of the first or second clock generators 121 and 122 according to the second control signal CON2 and outputs the write / read clock signal to the line memory 130. In the conversion mode, the output of the second clock generator 121 is output to the line memory 130.

In order to convert the signal of the 525 lines to the signal of the 625 lines in the line conversion unit 140, a weight of 1.2 is given to one line of the 525 lines, and the percentage of the 1H delayed signal and the current signal on the side of the converted 625 lines is different. Apply to make a line.

The percentage is generated in the first coefficient generator 151 by calculating the percentage for the second conversion mode in the weight generator 150, and calculates the percentage for the first conversion mode in the second coefficient generator 152. Is generated.

The output of the first or second coefficient generators 151 and 152 is switched to the line conversion unit 140 by switching the output of the second coefficient generator 152 by the fifth selection switch 153 according to the first control signal CON1. Is output.

The line is converted by the line converter 140 and then input to the D / A converter 110 through the third selection switch SW3. The D / A converter 110 converts the line-converted signal into a digital signal form and finally outputs the converted signal.

In the second conversion mode, the first selection switch SW1 is short-circuited to the first selection contact 0 indicating a low by the first control signal CON1, and the second selection switch SW2 is the first control signal. The third selection switch SW3 is short-circuited to the first selection contact 0 indicating the row by CON1, and the third selection switch SW3 is short-circuited by the second control signal CON2.

The signal processing flow for this is first, the output of the A / D converter 110 is stored in the line memory 130 through the first selection switch (SW1), and then the line converter 140 converts 625 lines to 525 lines. In this case, a weight of 0.833 is given to one line of 625 lines, and a line is applied to the 525 line to be converted by applying a percentage to the 1H delayed signal and the current signal, respectively.

The line-converted signal is input to the video RAM 160 through the second selection switch SW2 to perform field conversion. That is, when converting 50 fields into 60 fields, they are written to the video RAM 160 in synchronization with the synchronous signal of the original video signal (second TV signal), and when read out, they are adapted to the horizontal and vertical synchronization signals of the first TV signal. Read out. That is, one field required in the process of converting from 5 fields to 6 fields is set to 6 fields by repeatedly reading the 5th field.

After the field conversion, the digital signal is converted into a digital signal form by the D / A converter 110 through the third selection switch SW3 and finally output.

In the third conversion mode, the first selection switch SW1 is shorted to the second selection contact 1 indicating high by the first control signal CON1, and the second selection switch SW2 is connected to the first control signal CON1. The third selection switch SW3 is short-circuited to the first selection contact 0 indicating low by the second control signal CON2.

This third conversion mode is necessary because data is stored in the video RAM 160 during special playback such as still, slow, and strobe, and then is read out from the video RAM 160 in accordance with the special playback mode.

The signal flow for this is output from the A / D converter 110 is stored in the video RAM 160 by the second selection switch SW2. The data read from the video RAM 160 is output to the D / A converter 110 by the third selection switch SW3.

Even if the output of the video RAM 160 is line converted through the first selection switch SW1, the output of the video RAM 160 may not be output to the D / A converter 190 by the third selection switch SW3.

As described above, the apparatus for converting a television broadcasting system according to the present invention has the effect of converting the broadcasting system around the world into a desired broadcasting system in the video recording and reproducing apparatus in which a single broadcasting mode is set, and thus the circuit. There is an effect that can be simplified.

In addition, the present invention is effective in performing digital special functions in video equipment such as LDP, VCR, television, camcorder.

Claims (11)

Line for mutual conversion between the first television broadcasting system transmitting the first tracking line and the first predetermined number of fields per unit time and the second television broadcasting system transmitting the second total scanning line and the second predetermined number of fields per unit time A television having a first conversion mode for converting the first television broadcasting system into the second television broadcasting system and a second conversion mode for converting the second television broadcasting system to the first television broadcasting system; 1. A broadcast conversion device, comprising: first selecting means for selectively selecting a digital video signal input in a second conversion mode and a field converted signal by the field conversion means in a first change mode; Second selection means for selectively selecting a digital image signal input in a first conversion mode and a signal converted by the line conversion means in a second conversion mode; And a third selection means for selectively selecting and finally outputting the field-converted signal in the line-converted second change mode in a first conversion mode. The apparatus as claimed in claim 1, further comprising a third conversion mode for converting from the first television broadcasting system to the first television broadcasting system or from the second television broadcasting system to the second television broadcasting system. 3. The method of claim 2, wherein in the third conversion mode, the second selection means selects an input digital signal, and the third selection means selects an output of the field conversion means to convert the input digital signal into a field conversion means. A television broadcasting system converting apparatus, characterized by performing a special playback function such as still, strobe, and slow after reading. The system of claim 1, further comprising: system control means for determining a current change mode; And control command generating means for receiving data, a clock, and a strobe signal output according to the conversion mode recognized by the system control means and generating a conversion mode control signal corresponding thereto. The first control signal of claim 4, wherein the control command generating means outputs a first logical signal in a first conversion mode and a third conversion mode, and outputs a second logical signal in a second conversion mode. A third control means for outputting to the first and second selection means, and outputting a second control signal for outputting the first logical signal in the first change mode and the second logic signal in the third and third conversion modes. TV-type inverter, characterized in that output to the. 6. The apparatus of claim 5, further comprising: clock generation means for generating a write / read clock of the line conversion means during line conversion to a first or second television broadcast signal; Weight generation means for generating weights according to the first change mode or the second change mode during line conversion; And an address generating means for generating an address according to the first conversion mode or the second conversion mode, respectively, during field conversion. The clock generator of claim 6, wherein the clock generator comprises: a first clock generator for generating a clock signal of a first television broadcasting system; A clock generator for generating a clock signal of a second television broadcasting system; And a fourth selecting means for selecting an output of the first or second clock generator according to the second control signal. 7. The apparatus of claim 6, wherein the weight generator comprises: a first coefficient generator for generating a coefficient according to a weight in order to convert the second transform mode into a first television broadcast line; A second coefficient generator for generating coefficients according to weights in order to convert from the first conversion mode to a second television broadcasting line; And fifth selecting means for selecting an output of said first or second coefficient generator in accordance with said first control signal. 7. The apparatus of claim 6, wherein the address generating means comprises: a first field selection control signal for discriminating the odd / excellent field of a first television broadcast signal, a synchronization signal of a first television broadcast method, and a signal of a second television broadcast method; A synchronization signal generator for generating the odd / excellent field as a second field selection control signal and a second television broadcast type synchronization signal; A sixth selection for selecting a first field selection control signal, a first television broadcast synchronization signal or a second field selection control signal, and a second television broadcast synchronization signal output from the synchronization signal generator according to the first control signal; Way; And an address generator for generating an address in accordance with the field selection control signal selected by the sixth selecting means and outputting the address to the field converting means. 10. The apparatus according to claim 9, wherein the field converting means writes data in synchronization with a synchronization signal of an input television system broadcast signal when writing data during field conversion, and converts the signal generated by the synchronization signal generator when reading out by a field converting means. And a synchronous broadcast signal for synchronizing with a synchronous signal of a television broadcast signal. The apparatus of claim 6, further comprising: A / D conversion means for converting an input broadcast signal into a digital signal; And D / A converting means for converting the signal selected by said third selecting means into an analog signal.