JPH02294190A - Converter of television system - Google Patents

Abstract

PURPOSE:To display an NTSC signal after supplying the special effect of a video and to effectively use a memory by utilizing a speed change memory in the special reproduction of the NTSC signal when the NTSC signal is inputted. CONSTITUTION:The NTSC signal A/D-converted by an A/D converter 22 is stored in the speed change memory 20, and is converted to a signal on which the special effects of a multipicture, a still picture, and a strobo picture, etc., are given, and is introduced to a blanking insertion circuit 21. At the blanking insertion circuit 21, blanking insertion is interrupted by the control signal of a control circuit 24, and an input signal is outputted as it is, and is converted to an analog signal at a D/A converter 9, and it is converted from a luminance signal (Y) and two color difference signals(R-Y, B-Y) to R, G, and B signals at a reverse matrix circuit 11, then, they are displayed on a CRT 12. Thereby, the NTSC signal can be displayed by supplying the special effect, and also, the effective use of the memory 20 can be performed. Also, a generation circuit 30 controls a 1/2-frequency diver 21 which controls a line sequence switch 19 and a switching circuit 22 with a reset pulse corresponding to the rise of the output of an envelope detector 29. In such a way, the timing of selection by a permutator 9 is synchronized with that of the selection of the line sequence switch 19 and the switching circuit 22, which dispenses with coincidence by using a 1H delay line, and simplifies constitution.

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a television system converter, and particularly to a television system converter.
The present invention relates to a television format converter that can provide special video effects to C signals. [Prior Art] FIG. 2 is a diagram showing a television system converter of a television receiver, which is a prior art by the applicant, and in the figure, l is a first input terminal, and 2 is an A/D converter. , 3 is a de-emphasis circuit, 4 is a first PLL circuit, 5 is a second PLL circuit, 6 is a scanning line conversion circuit, 7 is a luminance signal processing circuit, 8 is a color difference signal processing circuit, 9 is a D/A conversion 10 is a switch circuit, 11 is an inverse matrix circuit, 12 is a CR
T, 13 is the second input terminal, l4 is the third input terminal, 1
5 is an NTSC decoder, 19 is a scanning line conversion filter circuit, 20 is a speed conversion memory circuit, and 2l is a blanking insertion circuit. Next, we will explain the operation. A high-visibility signal band-compressed by the MUSE method is applied to the input terminal 1. The high-definition signal has 1125 scanning lines, a filter frequency of 60 Hz, and a 2:1 interlaced signal. In the MUSE method, the above high-definition signal is transmitted in band 8.
It is compressed to MHz and transmitted on one channel using a broadcasting satellite. This compression is performed by offset subsampling, using inter-field and inter-frame offsets for still image parts and inter-line offsets for video parts. In addition, two color difference signals qR-Y, B-
Y is time compression multiplexed during the blanking period of the luminance signal. The high-visigon signal according to the MUSE method (hereinafter referred to as MUSE signal) applied to the input terminal 1 is converted into a digital signal by the A/D converter 2, and applied to the de-emphasis circuit 3 and the first PLL circuit 4, respectively. . The first PLL circuit 4 reproduces a correct sampling clock based on the phase information in the MtJSE signal. This correct sampling clock is supplied to the A/D converter 2, and the MUS is sampled with the correct phase.
The E signal will be applied to the de-emphasis circuit 3. The de-emphasis circuit 3 corrects the frequency characteristics of the MUSE signal, and this corrected signal is applied to the scanning line conversion circuit 6. The scanning line conversion circuit 6 is MUSE
7 out of 1125 scanning lines per frame of the signal
In addition to discarding 5 scanning lines and converting to 1050 scanning lines per frame, for example, by using a memory, the speed of the write clock is set to the speed obtained from the time axis of the MUSE signal, and the speed of the read clock is set to the speed obtained from the time axis of the MUSE signal. It is configured so that the speed is obtained from the time axis of . This read clock is output from the second PLL circuit 5. Therefore, one frame has 1050 scanning lines from this scanning line conversion circuit 6, and 2:1 interlace. A signal with a field frequency of 60 Hz is obtained. The output signal of the scanning line conversion circuit 6 is transmitted to the luminance signal processing circuit 7.
, and to each of the color difference signal processing circuits 8. The luminance signal processing circuit 7 performs field interpolation corresponding to line offset sampling to restore the band to its original value.
After this, interlace conversion is performed and 5
It has 25 scanning lines, provides a 2:1 interlaced signal, and has a field frequency of 60 Hz. On the other hand, in the color difference signal processing circuit 8, two time compression multiplexed color difference signals R-
The band is restored to its original value by carefully adjusting Y and B-Y and performing intra-field interpolation processing. Thereafter, interlace conversion is performed to convert into 525 interlace signals per frame. The luminance signal and two color difference signals output from the luminance signal processing circuit 7 and color difference signal processing circuit 8 are input to the scanning line conversion filter circuit 19. The scanning line conversion filter consists of a vertical digital filter, and converts the scanning line at a rate of 3 to 2, for example, and converts the scanning line at a rate of 350 per frame.
Outputs a signal with a field frequency of 60H2 having a real scanning line. In this way, the speed conversion memory circuit 20 stores 350 scanning lines per frame from the scanning line conversion filter circuit 19 as shown in FIG. 3(a). A luminance signal with a field frequency of 60 Hz and two color difference signals are input. The speed conversion memory circuit 20 is composed of a memory, and outputs a vertically time-compressed signal as shown in FIG. 3(b) by reading at a speed faster than the writing speed. The blanking insertion circuit 2l is the speed conversion memory circuit 2.
A vertically time-compressed signal of 0 is input, and by adding period blanking of 175 scanning lines to the shaded area shown in FIG.
Scanning lines of a book. It outputs a luminance signal with a field frequency of 60 Hz (350 effective scanning lines) and two color difference signals. The luminance signal and two color difference signals obtained through the above processing are converted into analog signals by the D/A converter 9 and input to the switch IO. On the other hand, the NTSC signal applied to the third input terminal 14 is guided to the NTSC decoder l5. NTSC decoder 1
Reference numeral 5 includes, for example, means for separating a luminance signal and a color signal, and means for demodulating a color signal, and outputs a luminance signal and two color difference signals from the applied NTSC signal. D/ above
The output signal of the A converter 9 and the output of the NTSC decoder 15 are applied to a switch circuit 10. switch circuit 10
is the MU on the TV screen that is applied to the second input terminal 13.
This switch circuit lO is controlled by a control signal for selecting whether to display an SE signal or an NTSC signal.
The device is configured to output one of two signals applied to the device. The output signal of the switch circuit 10 is input to an inverse matrix circuit 11, and primary color signals of 'R, G, and B are generated. The inverse matrix circuit 1l is the same as that implemented in current television receivers. The output signals R and CB of the inverse matrix circuit 11 are applied to the CRT 12 and displayed. [Problem to be solved by the invention] Since the conventional television format converter is configured as described above, the input for NTSC signals can be converted directly to C.
The problem was that it was not possible to create special effects by modifying the footage after it was sent to RT. The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a television format converter that can display a special video effect on an NTSC signal.

[Means to solve the problem]

The television format converter according to the present invention uses a speed conversion memory used for vertical time compression to produce special effects of the NTSC signal during NTSC signal processing. [Function] In this invention, since the speed conversion memory used for vertical time compression is used to produce special effects for NTSC signals during NTSC signal processing, the NTSC
It is possible to add special video effects to the C signal and display it, and to make effective use of memory. [Example] Hereinafter, an example of the present invention will be described with reference to the drawings. In FIG. 1, the same symbols as in FIG. 2 indicate the same things. 22 is a luminance signal (Y signal) and two color difference signals (R-Y, B-Y signals) output from the NTSC encoder l5.
An A/D converter that converts the signal into a digital signal, 23 is an MU
A switch 24 for switching between the SE signal and the NTSC signal is a control circuit that controls the speed conversion memory circuit 20 and the blanking insertion circuit 21 during NTSC signal processing. Next, the operation will be explained. The MUSE signal applied to the input terminal 1 is processed by the inverse matrix circuit 11 and output as NTSC R, G, B signals and displayed on the CRT 12 in the same manner as described in the conventional technique. On the other hand, the NTSC signal applied to the third input terminal l4 is transmitted to the NTSC decoder 15.
guided by. The NTSC decoder 15 includes, for example, means for separating a luminance signal and a color signal, and means for demodulating a color signal, and outputs a luminance signal and two color difference signals from the applied NTSC signal. The luminance signal and the two color difference signals are input to the A/D converter 22, converted into digital signals, and input to the switch circuit 23. switch circuit 2
3 is M on the TV screen applied to the second input terminal l3.
This switch circuit 23 is controlled by a control signal for selecting whether to display the USE signal or the NTSC signal.
The device is configured to output one of two signals applied to the device. When a control signal is given to the input terminal 13 to display an NTSC signal on the television screen, each output of the A/D converter 22 is led to the speed conversion memory circuit 20. Since the speed conversion memory circuit 20 is composed of a memory circuit having a capacity for one field of the NTSC system, the speed conversion memory circuit 20 is connected to the control circuit 20.
The output signal is converted into a signal with special effects such as multi-screen, still image, strobe screen, etc., and is guided to the blanking insertion circuit 21. The blanking insertion circuit 21 stops blanking insertion according to the control signal from the control circuit 24, and outputs the input signal as it is.
/A converter 9. D/A converter 9 and later are MUS
In the same operation as when the E signal is input, the D/A converter 9 converts it into an analog signal, and the inverse matrix circuit 1
1, the luminance signal (Y signal) and two color difference signals (R-Y, B
- Y signal) is converted into R, G, B signals, and the CRT12
will be displayed. In this way, in this embodiment, the A/D converter 22 performs the A/D converter 22.
The D-converted NTSC signal is stored in the speed conversion memory 20, and the control circuit 24 controls the memory 20 and the blanking insertion circuit 2l to convert the NTSC signal stored in the memory 20.
Since we added special effects to the signal and output it, NTS
The C signal can be displayed with special effects, and the memory 20 can be used effectively. In the above embodiment, the case where the NT is built into the television receiver has been explained, but the NT is installed after the D/A converter 9.
By providing an SC encoder and modulating the color signal, N
It may also be an adapter type television system converter that outputs a TSC composite signal and a Y/C separate signal. [Effects of the Invention] As described above, according to the present invention, when an NTSC signal other than the MtJSE signal is input, the speed conversion memory is
Since it is configured to be used for special reproduction of TSC signals,
This has the advantage of being able to display special video effects on NTSC signals, and also making effective use of the memory.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a television system converter according to an embodiment of the present invention, FIG. 2 is a block diagram showing a conventional television system converter, and FIG. 3 explains the operation of the speed conversion memory circuit. This is a diagram for 1.13.14 is an input terminal, 2.22 is an A/D converter,
3 is a de-emphasis circuit, 4.5 is a PLL circuit, 6 is a scanning line conversion circuit, 7 is a luminance signal processing circuit, 8 is a color difference signal processing circuit, 9 is a D/A converter, 10.23 is a switch,
1l is an inverse matrix circuit, 12 is a CRT, 15 is an NT
SC decoder, l9 is a scanning line conversion filter circuit, 20 is a speed conversion memory circuit, 2l is a blanking insertion circuit, 2
4 is a control circuit.

Claims (1)

[Claims] (1) 105 1125 scanning lines of input MUSE signal
means for converting the luminance signal of the scanning line-converted signal into a 525-line interlaced signal by subjecting the luminance signal of the scanning line-converted signal to a 525-line interlaced signal; RY and B- with time axis extension
Means for converting the two color difference signals into a Y color difference signal and performing intra-field interpolation processing on the two color difference signals and further converting the color difference signals into 525 interlaced signals; It has means for converting from a scanning line to 350 scanning lines, and means for inserting blanking into the luminance signal and two color difference signals converted from the scanning line, and the MUSE signal or NT
In a television system converter that converts the MUSE signal into an NTSC signal signal and outputs it when an SC signal is input and a MUSE signal is input, the input NTSC signal is converted from analog to digital and the above 525 signals are input. The present invention is characterized by comprising means for inputting data into a speed conversion memory of a scanning line converting means for converting a scanning line into 350 scanning lines, and a control means for applying a special effect to the NTSC signal stored in the memory and outputting it. Television format converter.