KR920006149B1 - Moving adaption succeeding scanning circuit for tv - Google Patents

Abstract

The scanning circuit extracts brightness and color signal from video signal to detect movement signal and converts interlaced scanning to sequential scanning using the movement signal. The circuit includes a comb filter (12) for extracting brightness and color signal, a frame difference detector (13) for detecting brightness difference of frames from field brightness data (Yf), a field difference detector (14) for detecting brightness difference of fields from field brightness data, a level comparator (15) for comparing output signals of the field and the frame brightness difference detector, a mixer (16) for mixing comb output signal, a sequential scanning signal generator (17) for generating sequential scanning signal according to the output signal of the mixer, and a level controller (18) for controlling ratio of the mixer and for generating scanning control signal.

Description

As a television adaptation sequential sequencing

1 is a block diagram according to the present invention.

2 is a specific circuit diagram of the comb filter 12 of FIG. 1 according to the present invention.

3 is an output characteristic diagram of a second low pass filter 217 and a high pass filter 216 according to the present invention.

4 is a detailed circuit diagram of the frame difference detector 13 of FIG. 1 according to the present invention.

5 is a detailed circuit diagram of the field difference detector 14 of FIG. 1 according to the present invention.

6 is an output characteristic diagram of the mix level controller 18 of FIG. 1 according to the present invention.

7 is a concrete circuit diagram of the mix 16 of FIG. 1 in accordance with the present invention.

8 is a detailed circuit diagram of the sequential scan signal output unit 17 of FIG. 1 according to the present invention.

* Explanation of symbols for main parts of the drawings

11: analog / digital converter 12: comb filter

13: frame difference detector 14: field difference detector

15: level comparator 16: mixer

17: Sequential scan signal output 18: Mix level controller

The present invention relates to a sequential scanning furnace in a television receiver. In particular, the present invention relates to a sequential scanning circuit that detects a motion signal by separating luminance / color (Y / C) from a video signal and extracts a sequential signal by the detected signal. It is about.

As TV broadcasting began, efforts were made to see better image quality by transmitting better screens. In its first day, it has evolved from a humpback TV to a color TV, and also voice multi-TV and teletext. Another step forward is to produce higher quality TVs. The concept created by this effort is the next generation TV (A-TV), and the main technical point of view of the next generation TV is the motion compensation of sequential scanning in Y / C separation and interlaced scanning.

This technical effort started with HD-TV of NHK in Japan in the early 1970s, and appeared as European MAC system and Advanced Compatible-TV (AC-TV) in USA, but Japanese HDK and European MAC method of NHK in Japan For example, AC / TV in Japan and ED-TV in Japan are compatible with current color TV. In this system, Y / C separation and sequential scanning are not possible. Inevitable Therefore, the next generation TV system that is compatible with the current color system is drawing attention to the advancement of this technology.

It is therefore an object of the present invention to provide a circuit applicable to the next generation television receiver.

Another object of the present invention is to provide a circuit for converting interlaced scans into sequential scans by separating motion signals of a conventional NTSC into luminance / color signals and compensating for motion.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram according to the present invention, which receives the output data of the analog / digital converter 11 and the analog / digital converter 11 for converting an image synthesized synchronization signal into digital data, and filters them by frequency spectrum. A comb filter 12 for separating color and luminance signals for each frame and field, a frame difference detector 13 for detecting a difference between frames from luminance data for fields of the comb filter 12, and the comb filter ( a field difference detector 14 for detecting a field difference from the luminance data for the field of l2), a level comparator 15 for comparing the level of the sensed outputs of the frame field difference detectors 13 and 14, and A mixer 16 for mixing the comb output of the comb filter 12 and the comb output of the comb filter 12 at a predetermined distribution ratio, and a sequential scan signal generator for generating a sequential scan signal by controlling the output of the mixer 16 ( 17) and the level ratio And a mix level controller 18 that converts the output of the unit 15 functionally to generate a distribution ratio determination control signal of the mixer 16 and a sequential scan signal generation control signal of the sequential scan signal output unit 17. do.

FIG. 2 is a circuit diagram of the comb filter 12 of FIG. 1 according to the present invention. The output stage 111a of the analog / digital converter 11 is connected to the first adder 23, the 1H delay circuit 21, and FIG. 3H adder 27, 6th adder 212, first subtractor 211, and 1H delay circuit 21 for delaying the output of the output terminal 111a by 1H, connected to the input terminal of the 525H delay circuit 29; A 525H delay circuit 29 for delaying the output of the output terminal 111a by 525H, a 1H delay circuit 22 for delaying the output of the first delay circuit 21 by 1H, and an output of the 1H delay circuit 22 And a first adder 23 for adding the output of the output terminal 111a, a third adder 27 for adding the output of the 1H delay circuit 22 and the output of the output terminal 111a, and the third adder ( A half amplifier 28 that amplifies the output of 27), a 525H delay circuit 29 that delays the output of the output terminal 111a by 525H, an output of the 525H delay circuit 29, and the output stage. Subtract the output of 111a for frame A first subtracter 211 for outputting a Ra signal, a sixth adder 212 for outputting a luminance signal for a frame by adding an output of the output terminal 111a and an output of the 525H delay circuit 29, and A -1/2 amplifier 24 which amplifies the output of the first adder 23 to -1/2, and adds the output of the -1/2 amplifier 24 and the output of the 1H delay circuit 21; A second adder 25, a 1/2 amplifier 26 that amplifies the output of the second adder 25 by -1/2, an output of the 1H delay circuit 21 and the 1/2 amplifier 28 A fourth adder 213 that adds the output of the "), a 1/2 amplifier 214 that amplifies the output of the fourth adder 213, and an output of the second divider 26. A low pass filter 216 for filtering, a band pass filter 217 for band-filtering the output of the second divider 26 and outputting color signals for the field, and an output of the 1/2 amplifier 214 And the luminance of the first peak by adding the output of the low pass filter 216. It is composed of a fifth adder (215) for outputting the call.

3 is an output characteristic diagram of the low pass filter 216 and the high pass filter 217 of FIG. 2 according to the present invention, where 3a is an output characteristic diagram of the low pass filter 216, and 3b is a high pass characteristic diagram. This is an output characteristic diagram of the pass filter 217.

4 is a detailed circuit diagram of the frame difference detector 13 of FIG. 1 according to the present invention, in which an output terminal 112c of the comb filter 12 is connected to an input terminal of a 525H delay circuit 411 and a second subtractor 412. 525H delay circuit 411, 525H delay circuit 411, the second subtractor 412, and the output of the second subtractor 412, which subtracts the output stage 112c. A low pass filter 414 which detects a frame difference by low pass filtering the output of the absolute stroke 413.

FIG. 5 is a detailed circuit diagram of the field difference detector 14 of FIG. 1 according to the present invention. The output terminal 112C of the comb filter 12 is connected to the input terminals of the 252H delay circuit 511 and the seventh adder 515. The 262H delay circuit 511 to delay 262H, the 1H delay circuit 5l2 to delay the output of the 262H delay circuit 511, and the output of the 262H delay circuit 511 and the 1H delay circuit 512. Of an eighth adder 513 that adds the output of the < RTI ID = 0.0 > 8-2 < / RTI > amplifier 514 to amplify the output of the eighth adder 513 to -1/2, and the -1/2 amplifier 514 Low-pass filtering the seventh adder 515 that adds the output and the output of the output terminal 112c, the absolute value 516 taking the output of the seventh adder 515 as an absolute value, and the output of the absolute value 516. And a low pass filter 517 for generating a field differential detection signal.

일때, Y=X+0.4에 의해 변환된 예이며, (6C)는

일때

에 의해 변환된 예이다.FIG. 6 is a conversion characteristic diagram of the mix level controller 18 of FIG. 1 according to the present invention, where 6A is an example converted by Y = 3X when the level is 2/10 at maximum.

Where Y = X + 0.4, and (6C) is

when

This is an example converted by.

7 is a detailed circuit diagram of the mix 16 of FIG. 1 according to the present invention, which connects the luminance field of the comb filter 12 and the frame signal output terminals 112c and 112d to the input terminals of the subtractor 711 and the adder 715. A subtractor 711 which connects the color field and frame signal output terminals 112a and 112b to the input terminals of the subtractor 712 and the adder 716 to subtract the input of the luminance field frame signal output terminals 112c and 112d; A subtractor 712 subtracts the inputs of the color field and frame signal output terminals 112a and 112b, and each output of the subtractors 711 and 712 and the output of the output terminal 18a of the mix level controller 18, respectively. An adder for generating luminance (Y) and color (C) signals by adding multipliers (713, 714) and the outputs of the multipliers (713, 7l4) and the inputs of the luminance / color frame stages (112d, 112b); 715, 716).

8 is a relief circuit diagram of the sequential scan signal output unit 17 of FIG. 1 according to the present invention, wherein the luminance C and color C stages of the mixer 16 include 1H delay circuits 811 and 817 and an adder ( 1H delay circuit 811 connected to the input terminals 812 and 818, and the output stage 18b of the mix level controller 18 to the input terminal of the multiplier 815 to delay the input of the luminance C stage by 1H. The 262H delay circuit 813 for delaying the output of the delay circuit 811H, the adder 812 for adding the output of the 1H delay circuit 811 and the input of luminance C, and the adder 812 A subtractor 814 for subtracting an output from the output of the 262H delay circuit 813, a multiplier 815 for multiplying the output of the subtractor 814, and the input of the mix control signal stage 18b, and the multiplier 815 The adder 816 generates a sequential luminance Y 'by adding the output of the adder 812 and the output of the adder 812, and a 1H delay circuit for delaying the signal at the color C end of the mixer 16 by 1H. 817, and An adder 818 that adds the output of the 1H delay circuit 817 and the input of the color C, and a 1/2 that amplifies the output 1/2 of the adder 818 to generate a sequential color C '. It consists of an amplifier 819.

Therefore, a specific embodiment of the present invention will be described in detail with reference to FIGS. 1 to 8, when the synthesized video signal passes through the A / D converter 11, the analog signal is changed into a count signal. This count signal is input to the comb filter 12. The signal input to the comb filter 12 is output to the output terminals 112a to 112d as signals of the C field, the Y field, the Y frame, and the C frame as in the comb filter circuit of FIG.

The operation of the comb filter 12 in FIG. 2 is as follows. The input coefficient video signal is first passed through the 1H delay circuit 21 and the 1H delay circuit 22. The signal not passing through the delay and the signal passed through the 1H delay circuit 22 are added through the first adder 23. Next, the signal is inputted to the second adder 25 via the -1/2 amplifier 24, and the signal passed through the 1H delay circuit 21 is also added to the second adder 25, and then added. The low pass filter 216 and the band pass filter 217 are input to the low pass filter 216. In addition, the counting video signal is input to the third adder 27. The third adder 27 adds the signal through the 1H delay circuit 22 and amplifies it 1/2 in the 1/2 amplifier 26. It is input to the fourth adder 213.

The fourth adder 213 adds the output of the 1H delay circuit 21 and the output of the 1/2 amplifier 28 and then outputs the output, which is output through the 1/2 amplifier 28 and the fifth adder 215. It is input to

The fifth adder 215 adds the signal passed through the low pass filter 216 and the signal passed through the 1/2 amplifier 214 to output the Y field signal. In addition, the signal passing through the band pass filter 217 outputs a C field signal.

On the other hand, the coefficient video signal is input to the 525H delay circuit 29, the subtractor 211, and the fifth adder 212. The subtractor 211 subtracts the C field signal by subtracting the signal from the 525H delay circuit 29. The sixth adder 212 outputs the Y frame signal by adding the signal through the 525H delay circuit 29.

The band pass filter 217 is for passing only the band of the part because the band of the C signal is 2MHZ to 4.2MHZ, and the low pass filter 2116 is for passing the component from the Y band to 0-2MHZ. The reason for inputting the signal output through the low pass filter 216 through the fifth adder 215 is to compensate for the portion removed and recognized as the C signal by the comb filter 12 in the Y low pass portion. .

3A and 3B show characteristics of the low pass filter 216 and the high pass filter 217. The difference between the Y field and C field signals and the Y frame and C frame signals is that the Y field and C field signals are output through a horizontal and vertical two-dimensional filter, and the Y field and C frame signals are signals filtered along the time axis. This time-filtered signal is used to complement the signal in the motion part.

The output of the comb filter 12 is input to the frame difference detector 13 and the field difference detector 14, and the operation of the frame difference detector 13 and the field difference detector 14 is as follows.

The operation of the frame difference detector 13 of FIG. 4 is performed by the second subtractor 412 subtracting the signal from the output terminal 112c from the input terminal Y field signal passing through the 525H delay circuit 411 and the signal not passing through the second subtractor 412. Is output through the low pass filter 414.

The absolute stroke 413 makes the negative signal a positive signal and the low pass filter 414 is required for high contact removal. The frame difference detector 13 detects motion between frames.

The field difference detector 14 shown in FIG. 5 specifically detects the movement between the fields. The operation is as follows. The output terminal 112c signal input to the field difference detector 14 is input to the signal further passing through the 262H delay circuit 512, and also to the eighth addition circuit 513. The signal is added, passed through the -1/2 amplifier 514, added by the seventh adder 515, and then output after passing through the absolute stroke 516 and the low pass filter 517. It functions as a cutout 413 and a low pass filter 414 of FIG. 4 passing through the absolute stroke 516 and the low pass filter 517.

일때는 Y=X+0.4(6B),

일때는

(6C)의 식에 의해 변환된다.The field difference detector 14 output signal and the frame difference detector 13 output signal are input to the level comparator 15. The level comparator 15 takes two signal enhancement cone signals and outputs them. The signal passing through the level comparator 15 is input to the mix level controller 18, and the control level is converted as shown in FIG. The conversion equation is converted by the equation Y = 3X when 2/10 of the level maximum (6A),

Is Y = X + 0.4 (6B),

When

It is converted by the formula of (6C).

The output of the mix level controller 18 is input to the mixer 16, and this signal passes through the mixer 16 as shown in FIG. The signals input to be mixed here are Y fields, Y frames, C fields, and C frames which are outputs of the output ends 112a-112d of the comb filter 12. Since the Y signal processing and the C signal processing are the same, only the Y signal processing will be described.

The Y field signal and the Y frame signal are input to the multiplier 713 via a subtractor 711. The multiplication is performed by multiplying the input values of the mix control signal stage 8a and inputting to the adder 715. The adder 715 adds and outputs the output of the multiplier 713 and the output of the Y frame. The output of the mixer 16 is output as Y and C signals, and is further input to the sequential scan signal output unit 17. As shown in FIG. 8, the Y signal of the input signal and the Y signal which have not passed through the 1H delay circuit 811 are added by the adder 812 and output. On the other hand, the signal passing through the 262H delay circuit 813 is input to the subtractor 814, which is subtracted from the output of the adder 812 to the multiplier 815, the multiplier 815 is mixed control It is multiplied by the control level of the signal stage 18b and then input to the adder 816.

The adder 816 adds the outputs of the adder 812 and the multiplier 815 to output Y '. On the other hand, the C signal is input to the adder 818 via the 1H delay circuit 817, added to the signal not passed through 1H, passes through the 1/2 amplifier 819, and then outputs the C 'signal. As a result, the sequential signal components Y 'and C' are output. Signals of Y, Y ', C, and C' are output through the sequential scan signal 17.

As described above, the interlaced scan signal is converted into a sequential scan signal, and the motion signal is detected, and the motion signal is adaptively compensated by the detected motion signal and then used as a final sequential signal. There is an advantage to this.

Claims (6)

In a progressive scan conversion circuit of a television receiver, an analog / digital converter 11 for converting an image synthesized synchronization signal into digital data and the output data of the analog / digital converter 11 are received and filtered in a frequency spectrum to obtain a frame. And a comb filter 12 for separating color and luminance signals for each field, a frame difference detector 13 for detecting a frame difference from luminance data Yf for fields of the comb filter 12, and the comb filter A field comparator 14 for detecting the field difference from the luminance data Yf for the field of (12), and a level comparator for comparing the levels of the two sensed outputs of the frames and the field difference detectors 13 and 14 ( 15) and a mixer l6 for mixing the comb outputs of the comb filter 12 and the comb outputs of the comb filter 12 at a predetermined distribution ratio, and for generating a sequential scan signal by controlling the output of the mixer 16; Sequential Scan Signal Output (17) And a mix level controller 18 that functionally converts the output of the level comparator 15 to generate a distribution ratio determination control signal of the mixer 16 and a control signal for generating a sequential scan signal of the sequential scan signal output unit 17. A circuit comprising: The 525H delay circuit 29 according to claim 1, wherein the comb filter 12 delays the output of the output terminal 111a of the analog / digital converter 11 by 525H. A first H delay circuit 22 for delaying the output of 1H, a first adder 23 for adding the output of the 1H delay furnace 22 and the output of the output terminal 111a, and an output of the 1H delay circuit 22; And a third adder 27 that adds the output of the output terminal 111a, a 1/2 amplifier 28 that amplifies the output of the third adder 27, and an output of the output terminal 111a. A 525H delay circuit 29 for delaying 525H, a first subtractor 211 for outputting a color signal for a frame by subtracting the output of the 525H delay circuit 29 and the output of the output terminal 111a, and the output terminal ( A sixth adder 212 that adds the output of 111a) and the output of the 525H delay circuit 29 to output the luminance signal for the frame, and amplifies the output of the first adder 23 to -1/2; 1/2 Amplifier (24) And a second adder 25 that adds the output of the -1/2 amplifier 24 and the output of the 1H delay circuit 21, and 1 / amplifies the output of the second adder 25 by -1/2. 2 adders 26, the outputs of the 1H delay circuit 21 and the outputs of the 1/2 amplifier 28, adds 4 adders 213 and 4 outputs of the fourth adder 213. A half amplifier 214 for amplifying, a low pass filter 216 for low-pass filtering the output of the second divider 26, and an output of the second divider 26 for band-pass filtering A band adder 217 for outputting a color signal, a fifth adder 215 for outputting a luminance signal for a field by adding the output of the 1/2 amplifier 214 and the output of the low pass filter 216; Circuit, characterized in that consisting of. The 525H delay circuit according to claim 1, wherein the frame differential detector 13 connects the output terminal 112c of the comb filter 12 to the input terminals of the 525H delay circuit 411 and the second subtractor 412 to delay 525H. 411, a second subtractor 412 for subtracting the output of the 525H delay circuit 411 and the output stage 112c, an absolute stroke 413 for absolute value of the output of the second subtractor 412, And a low pass filter (414) for detecting a frame difference by low pass filtering the output of the absolute stroke (413). The 262H delay circuit according to claim 1, wherein the field difference detector 14 connects the output terminal 112c of the comb filter 12 to the input terminals of the 262H delay circuit 511 and the seventh adder 515 to delay 262H. 511, a 1H delay circuit 512 for delaying the output of the 262H delay circuit 511 by 1H, and an eighth adder for adding the output of the 262H delay circuit 511 and the output of the 1H delay circuit 512. 513, -1/2 amplifier 514 for amplifying the output of the eighth adder 513 to -1/2, the output of the -1/2 amplifier 514 and the output of the output terminal 112c. To generate a field difference detector signal by low-pass filtering the output of the seventh adder 515, the absolute adder 516 taking the output of the seventh adder 5l5 as an absolute value, and the output of the absolute adder 516; And a low pass filter (517). 2. The mixer (16) of claim 1, wherein the mixer (16) connects the luminance fields of the comb filter (12) and the frame signal outputs (112c, 112d) to the inputs of the subtractor (711) and the adder (715). A subtractor 711 for connecting inputs 112a and 112b to the input terminals of the subtractor 712 and the adder 716 to subtract the inputs of the latitude and frame signal output terminals 112c and 112d, and the color field and frame signal output terminals. A subtractor 712 that subtracts the inputs of 112a and 112b, and a multiplier 713 and 714 that multiplies each output of the subtractors 711 and 712 with the output of the output stage 18a of the mix control level 18, respectively. And adders 715 and 716 for generating luminance (Y) and color (C) signals by adding the outputs of the multipliers (713, 714) and the inputs of the luminance / color frame stages (112d, 112b). Circuit specified. The sequential scan signal output unit (17) of claim 1, wherein the luminance (C) and color (C) stages of the mixer (16) are connected to the input terminals of the 1H delay circuits (811, 817) and the adders (812, 818). The output stage 18b of the mix level controller 18 to the input terminal of the multiplier 815, and the 1H delay circuit 811 for delaying the input of the luminance C stage 1H and the output of the 1H delay circuit 811. A 262H delay circuit 813 for delaying 262H, an adder 812 for adding the output of the 1H delay circuit 811 and an input of luminance C, the output of the adder 812, and the 262H delay circuit (( A subtractor 814 for subtracting the output of 813, a multiplier 815 for multiplying the output of the subtractor 814, and the input of the mix control signal stage 18b, the output of the multiplier 815, and the adder ( An adder 816 that adds the output of 812 to generate a sequential latitude Y ', a 1H delay circuit 817 that delays the signal at the color C end of the mixer 16 by 1H, and the 1H delay The output of circuit 817 and the A circuit comprising an adder 818 for adding the input of the color C, and a half amplifier 819 for generating a sequential color C 'by amplifying the output 1/2 of the adder 818. .

Images