JPH0541878A - Television system converter - Google Patents

Abstract

PURPOSE:To obtain the inexpensive device by using the signal processing circuit of the MUSE signal system and that of the NTSC system in common so as to decrease the circuit scale. CONSTITUTION:When a MUSE signal is inputted from an input terminal 1, a signal discrimination circuit 19 selects a switch 22 and an outputted signal is A/D-converted by an A/D converter 2, a 1st frame pulse detection circuit 16 detects a frame pulse of the MUSE signal and a PLL circuit 4 recover a correct sampling clock based on phase information in the MUSE signal. Moreover, when the NTSC signal is inputted from an input terminal 9, the signal discrimination circuit 19 selects the switch 22 to the position of the input terminal 9, the outputted signal is inputted to the A/D converter 2, and the PLL circuit 4 is not operated on the other hand, and a clock with a sufficient speed is applied for the A/D-conversion to the NTSC signal. The different processing circuit is used in common in response to the input signal and the operation is switched in response to the input signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television system converter for converting a MUSE signal into a non-interlaced signal having 525 scanning lines.

[0002]

2. Description of the Related Art High-definition television broadcasting is provided by the Japan Broadcasting Corporation (NH
It is performed by using a broadcasting satellite in the MUSE system developed by K). To receive this broadcast, a tuner for receiving satellite broadcast (hereinafter referred to as a BS tuner), a MUSE decoder, and a high-definition television monitor are required. But,
Since the MUSE system is different from the NTSC system, which is a television system that is widely used in ordinary homes, a high-definition television broadcast cannot be reproduced by a television receiver in an ordinary home.

Therefore, in order to reproduce a high-definition television broadcast on a television receiver of a general home, the MUSE signal is sent to the NTS.
It is necessary to convert C signal to MUSE signal and NTSC
A device for converting to a signal (hereinafter referred to as MUSE / NTSC converter) has been developed.

On the other hand, current NTSC receivers can be generally classified into two types. One is 525 scanning lines
It is a conventional receiver that reproduces by interlaced scanning of books, and the other one is called IDTV (Improved Definition TV) or EDTV (Extended Definition TV) that reproduces by non-interlaced scanning with 525 scanning lines. It is a receiver.

In these IDTV and EDTV receivers, the number of scanning lines is generally 525, and an NTSC signal which is an interlaced scan is interpolated by scanning lines in the receiver to convert the number of scanning lines to 525 and a non-interlaced signal to reproduce a reproduced image. It has gained. Then, in order to perform this scanning line interpolation, the processing is performed by taking an average of the levels of the scanning lines above and below the scanning line to be interpolated and performing the interpolation by storing the image of the previous frame. ing. However, according to these methods, there is a problem in that the image quality is conspicuously deteriorated due to flickering between scanning lines when the image moves faster.

The above-mentioned MUSE / NTSC converter is
It is intended for receivers that support interlaced scanning with 525 scanning lines. Therefore, ID high-definition TV broadcasting
When playing back on TV or EDTV, once set the scanning line number to 5
It is necessary to further convert the signal converted into the signal of 25 interlaced scans into the non-interlaced signal of 525 scanning lines. However, in this case, the image quality deterioration due to the scanning line interpolation when converting the interlaced signal to the non-interlaced signal is inevitable.

In order to solve this problem, a device (hereinafter referred to as a MUSE / EDTV converter) for directly converting a MUSE signal into a non-interlaced signal having 525 scanning lines has been developed.

FIG. 11 is a prior art MU filed by the applicant.
It is a figure which shows an SE / EDTV converter. Also, FIG.
2 and FIG. 13 are block diagrams showing the operation of FIG. A conventional technique will be described below with reference to the drawings.

MUSE input from the first input terminal 1
The signal has a sampling frequency of 16.2 MHz and is A / D converter 2
Sampled at. The sampled MUSE signal is sent to the PLL circuit 4 through the frame pulse detection circuit 3. The PLL circuit 4 reproduces a correct sampling clock based on the frame pulse in the MUSE signal detected by the frame detection circuit 3 and the phase information in the MUSE signal. This correct sampling clock is the above A / D
The MUSE signal supplied to the converter 2 and sampled in the correct phase by the A / D converter 2 is sent to the image conversion circuit 5.

The image conversion circuit 5 includes a scanning line conversion circuit 5a and an interlaced signal processing circuit 5b.

The scanning line conversion circuit 5a converts the number of scanning lines of an input signal from 1125 to 1050, and further,
The time axis is converted from the MUSE signal system to the EDTV signal system by using the first memory control circuit 40 and the memory circuit 42 (see FIG. 12) provided in the scanning line conversion circuit 5a. That is, the time axis is converted by writing to the memory circuit 42 with the clock of the MUSE signal system and reading it with the clock of the EDTV signal system. The signal output from the scanning line conversion circuit 5a is an interlaced signal with 1050 scanning lines. The signal output from the scanning line conversion circuit 5a is sent to the non-interlaced video signal processing circuit 5b.

Non-interlaced video signal processing circuit 5
In b, since the luminance signal and the color signal in the MUSE signal are sub-sampled, the luminance signal is interpolated in the field, and the non-interlaced signal with 1050 scanning lines to 525 scanning lines is interlaced. Convert to.

Similarly to the luminance signal, the color signal is interpolated within the field, and the interlace signal of 1050 scanning lines is a non-interlaced RY signal of 525 scanning lines and 525 scanning lines. Convert to interlaced BY signal. Furthermore, since the color signal is time-compressed, time-axis expansion is performed. Hereinafter, the signal output from the non-interlaced video signal processing circuit 5b will be referred to as a conversion signal.

The signal output from the non-interlaced signal processing circuit 5b is input to the first inverse matrix circuit 6 which is an RGB signal conversion circuit. In the first inverse matrix circuit 6, the input luminance signal Y and the two color difference signals R
-Y, BY are converted into RGB signals. The signal output from the first inverse matrix circuit 6 is the first D / A converter 7
Is converted into an analog signal and input to the selector 8. The second A / D converter 10 A / D converts the NTSC signal of 525 scanning lines interlaced input from the second input terminal 9. The interlace / non-interlace conversion circuit 11 converts the signal of the interlace of 525 scanning lines output from the second A / D converter 10 into 525 scanning lines.
Converts a book to a non-interlaced signal.

That is, by controlling the second memory circuit 112 by the second memory control circuit 110 shown in FIG. 13, writing to the second memory circuit 112 at the speed of NTSC signal system, and reading at the speed of EDTV system. To be realized. Then, the non-interlaced luminance signal Y and the two color signals RY and BY are output with 525 scanning lines. The signal is sent to the second inverse matrix circuit 12.

In the second inverse matrix circuit 12, the number of input scanning lines is 525 and each non-interlaced Y, RY,
The BY signal is converted into an RGB signal. Then, it is D / A converted by the D / A converter 13 and input to the selector 8.
The selector 8 receives the respective RGB signals output from the first inverse matrix circuit 6 and the second inverse matrix circuit 12 and D / A converted.

The signal output from the selector 8 is the third signal.
It is switched according to the signal input from the input terminal 15 of the. The number of scanning lines 52 thus selected by the selector 8
Five non-interlaced RGB signals are output from the output terminal 14.

[0018]

Since the conventional television system converter is configured as described above, MUSE
The signal processing system and the NTSC signal processing system each have A /
There is a problem that a D converter, a memory circuit, an inverse matrix circuit, a D / A converter, etc. are required.

The present invention has been made to solve the above-mentioned problems, and has a MUSE signal conversion system and an NTSC.
It is an object of the present invention to provide a television system converter having a simple circuit configuration by sharing an A / D converter of a signal conversion system, a memory circuit, an inverse matrix circuit and a D / A converter.

[0020]

A television system converter according to the present invention comprises an input switching means for switching between a MUSE signal input terminal and an NTSC signal input terminal, and the input MUSE signal or NTSC signal into a digital signal. A single A / D conversion means for converting, a single video converting means for processing the converted digital signal into a non-interlaced video signal, and a single video conversion means for converting the non-interlaced video signal into an RGB signal. RGB signal converting means and the RGB
And a single D / A conversion means for converting a signal from a digital signal to an analog signal.

Further, the input signal is a MUSE signal or NTS.
The present invention is characterized in that an input signal discriminating means for discriminating whether the signal is a C signal and signal processing according to the input signal are selectively performed based on the discrimination result of the input signal discriminating means.

[0022]

The television system converter according to the present invention is an HD
At least one of pulse detection and frame pulse detection, and an input signal discriminating means by detecting a synchronizing signal of an NTSC signal are provided, a different processing circuit is shared depending on the input signal, and the operation is switched according to the input signal. Therefore, the A / D converter, the memory circuit, the inverse matrix circuit, the D / A converter, and the like can be shared.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a first embodiment according to the present invention. Those having the same configuration as the example of the prior art shown in FIG. 11 are designated by the same reference numerals.

MUSE input from the first input terminal 1
The signal has a sampling frequency of 16.2 MHz and is A / D converter 2
Sampled at. The sampled MUSE signal is sent to the frame pulse detection circuit 3.

The frame pulse detection circuit 3 detects the frame pulse of the MUSE signal from the scanning lines of line numbers 1 and 2 in the MUSE signal and outputs the frame pulse. The frame pulse output in this manner is transferred to P via the switch 20.
The correct clock is input to the LL circuit 4 and reproduced by the PLL circuit 4.

The MUSE signal input from the first input terminal is also input to the input signal discriminating circuit 16. The input signal determination circuit 16 includes an HD pulse detection circuit 17, a synchronization signal detection circuit 18, and a signal determination circuit 19.

The MUSE signal is the HD pulse detection circuit 1
Input to 7.

The operation of the HD pulse detection circuit 17 will be described with reference to FIG.

The analog MUSE signal input from the input terminal 170 is input to the comparator 171. M
The beginning of the horizontal period in the USE signal is called the HD period, and its waveform consists of a pair of low-level and high-level signals, as shown in FIG.
6) level, (192/256) level when high level. Then, if the waveforms are such that the adjacent lines invert each other, that is, if the combination is low and high in the Nth scanning line, the combination is high and low in the N + 1th scanning line. The high and low level signals inverted between the pair of adjacent lines are waveforms peculiar to the MUSE signal.

The reference potential applied to the comparator 171 is set to 1/2 of the amplitude of the HD pulse. The comparator 171 outputs Hi level when a voltage higher than the given reference potential is input, and outputs Low level when a voltage lower than the applied reference potential is input. For example, when the line number N is input during the HD period, the reference potential is set at the center of the amplitude as shown in FIG. 4a, so the waveform output from the next point comparator 171 is the same as the waveform shown in FIG. 4b. Become. When the line number N + 1 having the waveform shown in FIG. 4c, which is the next line, is input, the waveform output from the comparator 171 is as shown in FIG.
The waveform is as shown in d. Thus, the signal output from the comparator 171 is the HD pulse pattern determination circuit 172.
Entered in.

The HD pulse pattern determination circuit 172 detects the HD pulse in the input MUSE signal. HD
The pulse waveform is a characteristic waveform as shown in FIG.
Such a waveform cannot occur outside the HD period. Therefore, when there is an HD pulse, the waveforms shown in FIGS. 4b and 4d are input from the comparator 171, so that when these waveforms are repeatedly input to the HD pulse pattern determination circuit 172 in one horizontal cycle, the HD pulse exists. become.

That is, the HD pulse pattern is MUSE
If it is determined that the HD pulse exists because it is unique to the signal, it can be determined that the MUSE signal is input from the first input terminal 1. Then, the determination signal for the presence / absence of the HD pulse pattern, that is, the determination signal for the presence / absence of the MUSE signal is output from the output terminal 173.

The sync signal detection circuit 18 detects the sync signal of the NTSC signal input from the second input terminal 9 and outputs a signal for determining the presence or absence of the sync signal.

The signal determination circuit 19 is the HD pulse detection circuit 1
7. The signal currently input is determined from the signal output from the synchronization signal determination circuit 18. For example, the action is H
When the D pulse detection circuit 17 detects the HD pulse of the MUSE signal, it is determined that the MUSE signal has been input.
When the HD pulse is not detected and the sync signal detection circuit 18 detects the sync signal of the NTSC signal, it outputs a signal for determining that the NTSC signal is input. Then, the determination signal S1 is sent to the switch 20, the switch 22, the scanning line conversion circuit 5a, the non-interlaced video signal processing circuit 5b, and the coefficient switching device 6b. The switch 20 operates so as to be turned on when the signal judging circuit 19 outputs the signal judged as the MUSE signal. The switch 22 receives the first signal according to the determination signal S1 from the signal determination circuit 19.
The signal from either the input terminal 1 or the second input terminal 9 is selected and output.

When the MUSE signal is input from the first input terminal 1, the signal determination circuit 19 determines the MUSE signal, turns on the switch 20 and switches the switch 22 to the first input terminal side. The signal output from the switch 22 is A
The signal is A / D converted by the / D converter 2 and sent to the first frame pulse detection circuit 3. The first frame pulse detection circuit 16 detects the frame pulse of the MUSE signal by an ordinary detection means, and the frame pulse is detected by the PLL circuit 4
Output to. The PLL circuit 4 is the frame pulse detection circuit 3
A correct sampling clock is regenerated based on the phase information in the MUSE signal from the frame pulse output from the.

This correct sampling clock (S2)
Is supplied to the A / D converter 2, and the MUSE signal sampled in the correct phase by the A / D converter 2 is sent to the image conversion circuit 5.

When the NTSC signal is input from the second input terminal 9 and the MUSE signal is not input from the first input terminal 1, the signal determination circuit 19 determines that the NTSC signal is input, and the switch 22 To the second input terminal 9.

The signal output from the switch 22 is input to the A / D converter 2.

When the NTSC signal is input and the MUSE signal is not input, the switch 20 is turned off and the PLL
The circuit 4 does not operate, and at this time, a clock having a sufficient speed for A / D converting the NTSC signal is supplied to each circuit.

The image conversion circuit 5 includes an in-interlace compatible video signal processing circuit 5b with the scanning line conversion circuit 5a. The scanning line conversion circuit 5a switches between scanning line number conversion and interlaced / non-interlaced conversion according to an input signal. This will be described with reference to FIG. When the MUSE signal is input, the first memory control circuit 400 and the memory circuit 403 which generate the control signal for performing the scanning line number conversion and the time axis conversion are used, and the scanning line number 112 of the MUSE signal is used.
Convert from 5 to 1050 and MUSE on the time axis
The signal system is converted to the EDTV signal system. Ie MUS
Writing to the memory circuit 403 with an E signal system clock ED
The time axis is converted by reading with the clock of the TV signal system.

When the input signal is an NTSC signal,
The operation of converting an NTSC signal which is an interlaced signal into a non-interlaced signal is performed. That is, a second control signal for performing interlace / non-interlace conversion is generated.
The memory control circuit 401 and the memory circuit 403 write a signal to the memory circuit 403 at a speed of NTSC signal system and output a signal to read at a speed of EDTV signal system to convert the interlaced signal into a non-interlaced signal.

To switch the memory control according to the input signal, the discrimination signal S1 of the signal discrimination circuit 19 is used. The switch 402 is controlled by the discrimination signal S1 input from the discrimination signal input terminal 406. That is, M
When the USE signal is input, the first memory control circuit 4
00 is connected so that the second memory control circuit 401 is selected when the NTSC signal is input.

The signal thus converted according to the input signal is a non-interlaced luminance signal Y and two color signals R-
It becomes Y, BY and is input to the non-interlaced video signal processing circuit 5b.

Non-interlaced video signal processing circuit 5
In b, when the signal determination circuit 19 determines the MUSE signal, the same operation as that of the conventional example is performed, and when the NTSC signal is determined, no processing is performed and the input signal is output as it is.

Non-interlaced video signal processing circuit 5
The signal output from b is sent to the RGB signal conversion circuit 6. The RGB signal conversion circuit 6 includes an inverse matrix circuit 6a and a coefficient switch 6b. The inverse matrix circuit 6a converts the input luminance signal and color difference signal into RGB signals.
In this case, since the coefficient of the inverse matrix differs depending on whether the input signal is the NTSC system or the MUSE signal system, the coefficient switcher 21 can provide the coefficient according to the input signal. This switching is performed using the determination signal S1 from the signal determination circuit 19. That is, the coefficient of the MUSE signal system is output when the MUSE signal is determined, and the coefficient of the NTSC signal system is output when the NTSC signal is determined.

The RGB signal thus converted by the inverse matrix circuit 6a is D / A converted by the D / A converter 7 and output from the output terminal 14 as a non-interlaced signal.

Next, another embodiment according to the present invention will be described. FIG. 6 shows a second embodiment, which is different from the first embodiment (FIG. 1) in that a frame pulse detection circuit 30 and a calculator 31 are newly provided in the input discrimination circuit 16. This newly added circuit will be described below.

FIG. 7 shows details of the HD pulse detection circuit 17 and the frame pulse detection circuit 30. The analog MUSE signal input from the input terminal 170 is supplied to the comparator 1
71 and 174. The scanning lines corresponding to the scanning line numbers 1 and 2 in the MUSE signal are called frame pulse lines and have a waveform as shown in FIG. The reference potential given to the comparator 174 is set to 1/2 of the amplitude of the frame pulse line. In the comparator 174,
Hi is input when a voltage larger than the given reference potential is input.
When a level or a small one is input, a Low level is output. When a frame pulse line is input, for example, when line number 1 is input, a reference potential is set at the center of the amplitude as shown in FIG. 9A, and when line number 2 is input, FIG. It shall be set as shown in.

Then, the waveforms output from the comparator 174 become the waveforms shown in FIG. 9B, respectively.

The signal thus output from the comparator 174 is input to the frame pulse pattern determination circuit 175. The frame pulse pattern determination circuit 175 detects a frame pulse pattern from the signal output from the comparator 174. The waveform of the frame pulse is a characteristic waveform as shown in FIG. 8, and such a waveform cannot be taken except in the frame pulse period. Therefore, when there is a frame pulse, the comparator 17
Since the waveforms shown in FIG. 4 to FIG. 9B and FIG. 9D are input, when these waveforms are input to the frame pulse pattern determination circuit 175, a frame pulse exists. That is, since the frame pulse pattern is unique to the MUSE signal, if it is determined that the frame pulse exists, it can be determined that the MUSE signal is input from the first input terminal 1. And
The frame pulse pattern determination circuit 175 outputs a signal indicating the presence / absence of a frame pulse pattern, that is, the presence / absence of a MUSE signal to the calculator 176.

Further, the HD pulse detection circuit 17 detects the HD pulse in the MUSE signal as in the first embodiment.
As described above, the HD pulse has a waveform peculiar to the MUSE signal, and therefore the presence or absence of the MUSE signal can be determined by the presence or absence of this waveform. The HD pulse pattern determination circuit 172 is M
A determination signal indicating the presence / absence of the USE signal is output to the calculator 31. In the calculator 31, the HD pulse pattern determination circuit 172
Then, the presence or absence of the input of the MUSE signal is determined from the two types of determination signals input from the frame pulse pattern determination circuit 175 and the determination signal of the input signal is output. That is, if both the discrimination signals input from the frame pulse detection circuit 30 and the HD pulse detection circuit 31 discriminate the MUSE signal, a signal with the MUSE signal is output, and both discrimination signals are the MUSE signal. If is not determined, M
The discrimination signal without the USE signal is output.

Further, if either of the inputted discrimination signals is interrupted, and if the other discrimination signal continues to discriminate the presence of the MUSE signal, it is discriminated that the MUSE signal is inputted and the MUSE signal is discriminated. Outputs a determination signal of presence.

With this configuration, the input MUS
When noise or the like is mixed in the frame pulse period of the E signal and, for example, the frame pulse pattern determination circuit 175 does not temporarily output the frame pulse determination signal, HD
If the pulse pattern determination circuit 172 repeatedly outputs the determination signal, it is determined that the MUSE signal is input, and the determination signal with the MUSE signal is output.

By thus determining the presence / absence of the input of the MUSE signal by two methods, the accuracy of determining the MUSE signal is improved.

Further, the television system converter in which the input signal is automatically detected as in the first and second embodiments and the signal processing corresponding to this is performed in each circuit has been described. Of course, it can be done manually. In that case, the switch 20, the scanning line conversion circuit 5a, the non-interlace-compatible video signal processing circuit 5b, and the coefficient switching device 6b are also configured to perform processing according to the input signal in conjunction with the switch 22 of FIG. Is desirable.

As shown in FIG. 10, it is possible to share only the RGB signal conversion circuit 6 and the D / A converter 7. In this case, the selector 8 is switched by the select signal (S3) input from the input terminal 15 to select the MUSU system signal or the NTSC system signal, and the selected signal is sent to the RGB signal conversion circuit 6. Further, the coefficient corresponding to the input signal is designated by the coefficient switch 6b in accordance with the select signal (S3), and the inverse matrix circuit 6a converts the RGB signal.
Other operations of each circuit are similar to those of the conventional example.

[0058]

As described above, according to the present invention, the MUS
The circuit scale can be reduced by sharing the A / D converter, the memory circuit, the inverse matrix circuit, the D / A converter, etc., which are common to the processing circuit of the E signal system and the processing circuit of the NTSC signal system. It is possible to supply an inexpensive device.

Further, by discriminating the input signal by the frame pulse detection of the MUSU signal, the HD pulse detection and the synchronization signal detection of the NTSC signal, each signal processing circuit is automatically operated according to the input signal. Therefore, complicated switching operation can be omitted.

Further, by discriminating the MUSE signal by a plurality of discriminating means of the frame pulse pattern discrimination and the HD pulse pattern discrimination, it is possible to discriminate the input of the MUSE signal with higher accuracy.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a television system converter according to the present invention.

FIG. 2 is an explanatory diagram of an HD pulse detection circuit.

FIG. 3 is a diagram showing a waveform of an HD pulse.

FIG. 4 is an explanatory diagram of HD pulse conversion.

FIG. 5 is a block diagram showing details of a scanning line conversion circuit.

FIG. 6 is a block diagram showing another embodiment of the television system converter according to the present invention.

FIG. 7 is a block diagram showing details of an HD pulse detection circuit and a frame pulse detection circuit.

FIG. 8 is a diagram showing a waveform of a frame pulse.

FIG. 9 is an explanatory diagram of frame pulse conversion.

FIG. 10 is a block diagram showing another embodiment of the television system converter according to the present invention.

FIG. 11 is a diagram showing a conventional television system converter.

FIG. 12 is a diagram illustrating a conventional television system converter.

FIG. 13 is a diagram illustrating a conventional television system converter.

[Explanation of symbols]

 1 MUSE signal input terminal 2 A / D converter 5 image conversion circuit 6 RGB signal conversion circuit 7 D / A converter 9 NTSC signal input terminal 14 output terminal 16 input signal discrimination circuit

Claims (6)

[Claims] 1. A terminal to which a MUSE signal is input and NTS
Each terminal is provided with a C signal,
A television system converter for converting a signal and the NTSC signal into a non-interlaced signal with 525 scanning lines, input switching means for switching between a MESE signal input terminal and an NTSC signal input terminal, and the input MUSE signal or NTSC signal A single A / D conversion means for converting the signal into a digital signal; a single image conversion means for processing the converted digital signal into a non-interlaced video signal; and a conversion of the interlaced video signal into an RGB signal A television system converter having a single RGB signal converting unit for converting the RGB signal from a digital signal to an analog signal. 2. The television system converter according to claim 1, further comprising means for detecting an HD pulse of the MUSE signal, and NTSC.
A television system having a signal synchronization signal detecting means, and having an input signal determining means for determining whether the input signal is a MUSE signal or an NTSC signal according to the presence or absence of HD pulse of the MUSE signal and the presence or absence of the synchronizing signal of the NTSC signal. converter. 3. The television system converter according to claim 2, wherein said input switching means, said image signal means, and said RGB signal conversion means are responsive to an input signal based on the discrimination result of said input signal discrimination means. A television system converter characterized by selectively performing signal processing as described above. 4. The television system converter according to claim 1, further comprising a frame pulse detecting means for the MUSE signal and an HD.
An input signal for detecting whether the input signal is a MUSE signal or an NTSC signal is provided by providing a pulse detection means and an NTSC signal synchronization signal detection means, and determining the presence or absence of the frame pulse of the MUSE signal and the presence or absence of the NTSC signal synchronization signal. A television system converter having a discrimination means. 5. The television system converter according to claim 4, wherein said input switching means, said image signal means, and said RGB signal conversion means are responsive to an input signal based on the discrimination result of said input signal discrimination means. A television system converter characterized by selectively performing signal processing as described above. 6. A terminal to which a MUSE signal is input and NTS
The MUSE is provided with each terminal for inputting the C signal.
In the television system converter for converting the signal and the NTSC signal into a non-interlaced signal with 525 scanning lines, a first A / D for converting the MUSE signal into a digital signal
A converter, a non-interlaced video signal processing means for processing the digitized MUSE signal into a non-interlaced signal, a second A / D converter for converting the NTSC signal into a digital signal, and the digitized An interlaced / non-interlaced signal converting means for converting an NTSC signal into a non-interlaced signal, a non-interlaced signal obtained from the MUSE signal, and a non-interlaced signal obtained from the NTSC signal. A single RGB signal conversion means for selectively converting one of them into an RGB signal, and a single D / A for converting the RGB signal into an analog signal
A television system converter having a converter.