JPH04117871A - Horizontal trigger pulse changeover circuit - Google Patents

Abstract

PURPOSE:To prevent horizontal blanking from appearing on a screen by adding a synchronization presence discrimination section using a composite synchronizing signal outputted from a synchronizing separator section as an input signal and selecting the composite synchronizing signal outputted from the synchronizing separator section and a horizontal pulse from a horizontal oscillation section for a horizontal trigger pulse of a clock section. CONSTITUTION:When no television video signal input exists, a horizontal oscillation section 8 reaches the 'self-running oscillation' state and a horizontal blanking pulse of an analog video signal processing section 5 is synchronously with the 'self-running oscillation' of the horizontal oscillation section 8. On the other hand, a synchronizing signal presence discrimination section 10 discriminates the state to be absence of the synchronizing signal and throws a horizontal trigger changeover section to the position of the horizontal pulse from the horizontal oscillation section 8. As a result, the clock section 2 is synchronously with the 'self-running oscillation' of the horizontal oscillation section 8, its converted horizontal synchronizing signal is synchronized and also a deflection section 4 is synchronously therewith. Thus, the horizontal blanking pulse of the analog video signal processing section 5 and the horizontal deflection of the deflection section 4 are synchronized with each other and no blanking pattern appears on the screen due to the absence of the video signal.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an evening scanning line conversion 14-notal TV cursor horizontal 1 rigger pulse.

Conventional Technology In recent years, there has been a remarkable movement in technological innovation in the promotion and commercialization of Kashi'I■. Among them, feel 1 ・Furi,
To eliminate car 4, horizontal 1Mf direct scanning line number/l! , 2 (
4bConvert l' A 1. ,'? -1-Mi CAi
ν1 method linker-free 'l' V, or +;H
, l'j in-fri, to eliminate the force, the horizontal scanning line is omitted, and the clear histion '1゛v, which is double-fine scanning, etc.
Inner running line conversion technology using Y4 digital signal processing using memory is being adopted for width. Furthermore, V l'
The horizontal synchronization signal of Ii'S is non-standard (because the correlation between the main, sub-hand, and rear is poor). rain
Mouth, way J, (: is in the majority -(there.

That’s it for the illustrations. ! : While referring to the conventional system mentioned above,
I will mainly explain the water buffalo 1'J car in the clock section in the in-link system running A-line IA exchange Kan-1''J.

In Fig. 2, 1 is a running line converter, 2 is an IJ7 converter, 3 is a malinox unit, 4 is a deflection unit, 5 is an analog video signal processing unit, [5 is the same 1υ1 separation unit, 7 is 11+ from the car surface
In the fourth part, ) 3 is a horizontal oscillation part, and 9 is an analog synchronization pulse generation part.

The operation of the no-in-ron type scanning line conversion color 'F' constructed as described above will be explained.

The explanation will be divided into two parts: video (millimeter processing) and French processing. First, regarding video signal processing, the J-Level video signal is processed by analog video (manufactured by No. 8 processing unit 5,
, 'c separation, rimma demodulation, Y, I)L, cla>
It undergoes processing such as amplifier processing, outputs Y (luminance signal) and two color difference signals, is manually input to the line conversion section I, and is connected to the two system clock sections.

A/1 that operates in the evening. ,C,1,), △, memory, Nostem Core 10- is converted into a running blue line in the 4th grade, outputs two converted color differences (,1- and Y' (converted luminance 1^), and outputs the map ], the clock section; /Cho output to CRi'
'·Output.

On the other hand, regarding synchronization (signal processing), the TV video signal is manually input to the same unit 1 separation section 6, outputs the combo shift 1, and outputs the 11r direct oscillation section 7, horizontal oscillation section 8, and 27
Part 2 2. Analog 4i pulse generation/character part 9c is manually powered, and the car surface oscillation part outputs the table surface pulse as a black and white pulse, and at the same time outputs the table surface pulse as a black and white pulse.
]ri i;
Horizontal pulse variable analog/synchronous pulse generator 9-・
Analog 1', I-G fellow pulse generating section 9 outputs Hurst check I, blanking, and clamp pulses to analog video signal processing section 5-. [The first part is
・Sink's horizontal 1 rigger, jlj direct pulse's vertical] Operates in synchronization with the liquor pulse, scan converter lhesistim black, rishin υ left, 71 links part 3
-Conversion Planking, Conversion)>'Pulse is output to the deflection unit 4 as a converted horizontal zinc pulse and a converted vertical sync pulse, and the deflection unit also outputs the converted horizontal zinc pulse and the converted vertical sync pulse. IJ1shite1〕Y・
to deflect.

However, with the above configuration, when the TV video signal becomes silent, the Bosinto sync output of the branch office G disappears, and the horizontal oscillator 8 is a free-running oscillation state °
The input filter gate of the analog video processing unit 5, No. 13, which is created from this pulse, is horizontal oscillation 1; Synchronize with ゛.

On the other hand, since the R C17 R2 also uses the combo/[・sink output as a horizontal 1' hemlock, it is in a "free-running oscillation state" (), and the converted horizontal The sink is the same, the deflection part 4 is also black, and the deflection part 2 is the same.
li (operates at a "free-running oscillation frequency °". As a result, the horizontal blanking phase of the analog image No. 15 processing 5 and the horizontal position E of the offset 11. ,-I
The Fran 1st rank of I Dokin 1 has changed to Sosei Green (Qr'8I+
+, 71 passes through the linox section 32, and on the CR'I' pipe bending, a problem occurs that appears in the form of a 4-in-1].

Here, to change the horizontal pulse output of the horizontal oscillator 33 from the horizontal 1 liquor pulse of the groove/reverse section 2, even when there is no signal, the clock section 2 synchronizes with the horizontal pulse of the horizontal oscillator 33. Horizontal hunching Ij of analog image No. 1 processing unit 5
'7. tll and the horizontal phase of the deflection section are synchronized, and the horizontal phase of the deflection section is synchronized.
4 sync can be prevented from appearing, but reflection 1
When the signal exists, the clock unit 4 detects the phase A of the vertical I liquor pulse and the horizontal liquor pulse output from the vertical oscillation unit 7.
In this case, the number of output corners of the feel I is being determined, but since the circuit 179 of the horizontal oscillation unit 4 is formed, the phase is delayed compared to the I1 direct pulse, and the selling price cannot be maintained due to the phase relationship necessary for determination. figure,
Field 10) It is not possible to judge whether it is even or not, and as a result, there is a problem that it causes vertical or evening. The present invention solves the problem described in item 1-1, and provides a switching circuit for horizontal 1 trigger pulse for horizontal line conversion of 1'' and I for clockwise.

Means for Solving the Problem - 1 - In order to solve the problem, synchronization with 1υI', > separate output combo song synchronization as input 1a-j -h non-discrimination part';: m 71[1si, This output (in issue 5, r u7
The configuration is such that one horizontal rigger pulse of the horizontal oscillator is switched between the combo pulse of the synchronous separator output and the horizontal pulse of the horizontal oscillator.

Effects of the present invention are as follows: 1. Also, due to the configuration, if there is no human power for the video signal, 20. The horizontal 1 rigger in the rear section uses the water buffalo pulse of the horizontal oscillation section7, and the flanking horizontal phase of the analog image processing section and the phase of the deflection section are the same.
In addition, when video information is input, the horizontal 1 rigger of the clock section is connected to the vertical IL 117 phase of odd-even feel 10 judgment with 1 fugger pulse
The two problems can be solved without contradicting each other by making precise judgments and preventing vertical sonotars.

Embodiments As described above, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows "scan line conversion 'I'" in an embodiment of the present invention.
2 is a block diagram of a horizontal trigger pulse switching circuit j for a 1-inch signal processing section of M.

In FIG. 1, ゛ζ, 1 to 9 have the same contents as in FIG.
4 is a deflection section, 5 is an analog signal processing section, f is a synchronization separation section, 7 is a vertical oscillation section, 8 is a water (-oscillation section, 9
is the analog synchronous pulse generator, and 10 is the number of times! 11 is the horizontal 1 liquor +-JJ replacement part.

The above-mentioned one-stroke line transformation 'l'' V (
2) The operation of the r゛internal signal processing unit L27 water + 1 rigger/rus switching circuit'' will be described above.

The basic operations of configurations 1 to 9 are the same as the conventional example, so
The synchronization separation unit 6. is omitted here. Horizontal oscillation section 8. Analog video signal processing section 5. Cronk part 2. Deviation part 4. The relationship between the synchronizing signal presence/absence determining section 1 ( ) and the horizontal 1 repower switching section 11 will be mainly explained.

First, let us consider the operation when there is a human input for the television video signal. The synchronous separation unit 6 outputs a composite '71 signal, and the vertical oscillation unit 7. Horizontal oscillation section 8. Synchronization presence/absence determination unit 1 (
J, Horizontal 1 re-force switching section - Output, same 1 re-force switching section I
n determines that the same 1Ilj is present, the horizontal 11) switching unit is moved to the output side of the 1υ1 separation unit 6, and the horizontal 1 rigger of the clock unit 2 becomes a composite sync. As a result, the phase relationship between the output vertical 1 rigger of the vertical oscillator section 7 and the white even number field 1 is unreasonable, and the clock section 2's determination of the center even number field 1 is not accurate. , the vertical sinter appears as L
- If it does not exist Q) Think about action 4. The output of the synchronization separation section disappears, and the water buffalo oscillation section) 3 enters the "stop oscillation" state, and the horizontal blanking pulse of the analog video signal processing section 5 is also synchronized with the horizontal oscillation section 130) "free-running oscillation". -, synchronization (since the output of the synchronization separator 5 is input to the synchronous presence/absence determination unit IO, it determines that there is no synchronization,
Horizontal 1 re-force - Move the switching section to the horizontal pulse side of horizontal oscillation section) 3. As a result, the horizontal pulse of the "free-running oscillation" is input to the horizontal 1 liquor of the clock section 2, and the clock section 2 is synchronized with the "' free-running oscillation pulse of this horizontal oscillation section), and the horizontal pulse of the horizontal The sheaths are also synchronized, and the 1st knitting section 1 also does the same thing as C!Il+.

Therefore, the horizontal angle of the analog video signal processing section 5 and the amount of buffalo deflection of the deflection section 4 are synchronized, and 1 in flanking 1 does not appear without e i &L; υ.

In this way, according to this embodiment, the presence/absence determining section G, 11 is provided, and this output signal is used to switch between the combination 7 pulse of the synchronization separation output and the horizontal pulse of the horizontal oscillation section, and send it to the clock section.
Supply water'+! -1 rigger pulse cut-off circuit 4 is provided (this can prevent the image from appearing in the horizontal blowing direction when there is no human power for the image 1).

Effects of the Invention As is clear from the above-described embodiments, the present invention provides a clock section which supplies horizontal pulses of the horizontal oscillation section by switching between horizontal pulses appearing in a horizontal flank or a circular curve. A rigger pulse switching lpJ path can be provided.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention that performs scanning A-line conversion. 1...Scanning line conversion unit, 2...Clock unit, 3...71 links unit, 4... Deflection section, 5
...Anakoku 1d connection science department, b...Synchronization separation section, 7...City direct oscillation section,)3...
Horizontal oscillation section, 9...Analog synchronous pulse generation 11J (
Part 10... Same! 'Jl No. 11 presence/absence determination section,
11...Horizontal 1 rig change section.

Claims (1)

[Claims] Line, lock, and scanning line conversion of color difference and luminance signals after analog demodulation Video digital signal processing section (hereinafter referred to as scanning line conversion section), composite sync of analog synchronization separation section, and output of vertical oscillation section are used as horizontal and vertical trigger pulses to generate both the horizontal and vertical synchronization signals and both blanking and clamp pulses for the system clock of the scan line converter or the scan line converter for the subsequent deflection and matrix sections. The PLL line lock clock section (hereinafter abbreviated as the clock section) performs processing such as Y/C separation, chroma demodulation, Y/DL, clamp, blanging, amplifier, etc. from the color TV video signal input, and performs processing such as luminance and two color differences. An analog video signal processing section (hereinafter abbreviated as analog video signal processing section) that outputs a signal, a synchronous separation section (hereinafter abbreviated as synchronous separation section) that separates analog and synchronous from a color TV video signal, and this output A vertical oscillation section that synchronizes with the synchronous separation output, a horizontal oscillation section that AFC locks to the synchronous separation output, and analog synchronous pulses necessary for analog demodulation of burst gate, crimp, and blanking from the output signals of the synchronous separation section, horizontal, and vertical oscillation sections. a generating section, and a deflection section driven by both scanning line conversion horizontal and vertical synchronization signals output from the clock section;
A matrix section that uses a scanning line conversion luminance signal (hereinafter abbreviated as Y') output from a scanning line conversion section and two color difference signals of the scanning line conversion as input signals, converts them into an R/G/B matrix, and drives the CRT; A section for determining the presence or absence of an input TV video signal using a sync separation output (hereinafter referred to as a sync signal presence/absence discriminating section) uses this output signal to switch between the composite sync of the sync separation section output and the horizontal pulse of the horizontal oscillation section. , a horizontal trigger pulse switching circuit that supplies to the clock section, switches the horizontal pulse output of the horizontal oscillation section when no video signal is input, and the composite synchronization signal output of the sync separation section when a video signal is input, as the horizontal trigger pulse of the clock section. , when no video signal is input, the composite synchronization output disappears, the clock section enters a horizontal, free-run state, and the deflection section that uses that output also operates with this horizontal free-run frequency divided output, and the horizontal oscillation section output The analog synchronization pulse used and the horizontal rate are asynchronous, and the analog video signal processing unit and deflection circuit that use these are also asynchronous, preventing a blanking image of the video signal from appearing on the screen in a window wiper state. A horizontal trigger/pulse switching circuit featuring: