CN2694675Y

CN2694675Y - A digital processing TV set

Info

Publication number: CN2694675Y
Application number: CN 03267295
Authority: CN
Inventors: 张大庆; 李鸿安; 戴青松
Original assignee: Shenzhen Skyworth RGB Electronics Co Ltd
Current assignee: Shenzhen Skyworth RGB Electronics Co Ltd; Shenzhen Chuangwei RGB Electronics Co Ltd
Priority date: 2003-07-04
Filing date: 2003-07-04
Publication date: 2005-04-20
Anticipated expiration: 2013-07-04

Abstract

The utility model relates to a digital processing TV set. The simulation television signal is sent into a digital processing module. The digital processing module is controlled by the bus to convert the line-field scanning frequency. The pumping signal of RGB three primary colors and the line-field synchronizing signal are output. A line-field processing circuit is controlled by the line-field synchronizing signal to output the line-field scanning current in the line-field deflection. The converted RGB three primary colors drive a picture tube cathode to emit the electric and are controlled by the line-field deflection to form image, after actuated and magnified by a view playing module. The utility model provides a switchable multimode digital processing television which integrally outputs and displays interlacing 50Hz (high line frequency), interlacing 75Hz (high field frequency) and 60Hz line by line. The digital processing TV set not only effectively solves the problem of large area flicker and interline flicker, but also greatly degrades the costs of Research Development and production.

Description

A kind of digital processing television

Technical field

The utility model relates to TV, relates in particular to a kind of digital processing television.

Background technology

At present, traditional simulated television generally adopts 50Hz interlacing scan (line frequency of 15kHz, horizontal line are 625 lines), because technological deficiency, there is the problem of large-area flicker, interline flicker and row rustic in these 50Hz interlaced scan tvs; And the 100Hz interlacing that new development is got up (31kHz line frequency) and 60Hz line by line (31kHz line frequency) though digital processing television efficiently solves the problems referred to above, but for the 15kHz line frequency, line frequency significantly improves, thereby causes research and development input and production cost to significantly improve.

The utility model content

Technical problem to be solved in the utility model is: overcome existing digital processing television high deficiency of cost when eliminating large-area flicker, interline flicker, provide a kind of and can effectively solve large-area flicker and interline flicker, the digital processing television that significantly reduces cost again.

The utility model is to solve the problems of the technologies described above the technical scheme that is adopted to be:

This digital processing television, radiofrequency signal is exported intermediate-freuqncy signal after high-frequency tuner amplifies mixing, in middle amplification module, go out composite colour television signal through the intermediate frequency amplification demodulator, and frequency discrimination obtains second accompanying sound intermediate frequency signal, described second accompanying sound intermediate frequency signal is exported sound accompaniment by loud speaker after being sent to sound accompaniment processing and audio power amplifier module, it is characterized in that: described composite video signal is sent into digital signal processing module, described digital signal processing module carries out the row-field scanning frequency translation under total line traffic control, output RGB three primary colors pumping signal and row field sync signal, row the treatment circuit output row-field scanning electric current in the field deflection of being expert under the control of field sync signal of being expert at; RGB three primary colors after the conversion are amplified rear drive tube cathode emitting electrons and the field deflection of being expert at control imaging down through looking the amplification module excitation.

Described composite video signal is separated with light tone after S terminal signals, YUV separation signal send into digital signal processing module, in decoder through switching gate, automatic gain control, the A/D conversion, carry out the RGB digital signal that light tone is separated back decoding output 50Hz field frequency, 15k line frequency by comb filter, under frame frequency controller control, be temporarily stored into the frame frequency buffer with one times of fast data, with different speed read realization to 75Hz interlacing, 60Hz line by line, the frame frequency conversion of 50Hz interlacing.

Signal behind the described frame frequency conversion carries out dynamic image in the key frame display module of digital signal processing module handles, the processed video signal mixes with the image windows user interface (OSD) of being drawn down by CPU control and sends into the D/A converter through the brightness adjustment, output analog rgb tristimulus signals.

The beneficial effects of the utility model are: the utility model provides a kind of collection 50Hz interlacing (high line frequency), 75Hz interlacing (high field frequency), 60Hz exports the changeable digital processing television of the multi-mode that is shown in one line by line, 50Hz field frequency with respect to simulated television, the 15KHz line frequency, the utility model is implemented under the software control, digital processing chip is a fixedly line frequency (this line frequency is guaranteed to be issued to 625 horizontal scanning lines in the 75Hz interlaced mode) of 23KHz with PAL (the line-by-line inversion orthogonal balanced width of cloth system) conversion of signals of input, with different field frequency 75Hz interlacing, the 50Hz interlacing, the 60Hz changeable output of multi-mode line by line shows.Owing to adopt such scheme, under the 75Hz interlace mode,, can eliminate large-area flicker owing to adopt high field frequency, image stabilization is watched program for a long time, the eyes indefatigability; Under the 60Hz progressive scan mode, can eliminate large-area flicker substantially, the stable and elimination interline flicker of image; Under the 50Hz interlace mode, because line frequency fixes, scan line increases (reaching 937 lines) greatly, can make image finer and smoother, and the high-accuracy graphic program such as quotations on the stock market that manifests can reach the computer display effect, and the picture innervation is clear.The utility model other modules except that the digital processing module can be consistent with simulated television, need not do big change, can save research and development and production cost greatly.

Description of drawings

Fig. 1 is the utility model circuit theory schematic diagram;

Fig. 2 is the utility model digital signal processing module principle schematic.

Embodiment

With embodiment the utility model is described in further detail with reference to the accompanying drawings below:

The utility model adopts digital signal processing module that anolog TV signals are handled, and the TV signal of input is converted to the fixedly line frequency of 23KHz in digital signal processing module, and this line frequency is guaranteed to be issued to 625 horizontal scanning lines in the interlaced mode of 75Hz.In DPTV, realize to 75Hz interlacing, 60Hz line by line, the frame frequency conversion of 50Hz interlacing, changeable output shows.Under the 75Hz interlace mode, because field frequency improves, can eliminate large-area flicker, image stabilization is watched program for a long time, the eyes indefatigability, thereby line by line scan for the line frequency of the 31KHz that adopted with respect to existing employing 100Hz interlacing scan and 60Hz, the utility model has just improved line frequency a little on the basis of 15KHz line frequency, do not need TV is significantly changed and can be realized, thereby saved research and development and production cost greatly.

Be illustrated in figure 1 as the utility model circuit theory schematic diagram, PAL (line-by-line inversion orthogonal balanced width of cloth system) radiofrequency signal (RF) is exported intermediate-freuqncy signal (IF) after high-frequency tuner (TUNER) 10 amplifies mixing, in middle amplification module 20, go out composite colour television signal (VIDEO) through the intermediate frequency amplification demodulator, frequency discrimination obtains second accompanying sound intermediate frequency signal, and second accompanying sound intermediate frequency signal is sent to sound accompaniment processing 30 and sound accompaniments are exported by loud speaker 50 in audio power amplifier module 40 backs; Composite video signal (VIDEO) is then sent into digital signal processing module (DPTV) 60 and is handled, digital signal processing module 60 adopts the high-end digital television integrated circuit (IC) chip of single-chip in TRIDENT (safe ancient cooking vessel company) the D series video chip, signal is through A/D (mould/number) conversion in DPTV digital signal processing module 60, and the decoding back is at I ²Carry out the row-field scanning frequency translation under the total line traffic control of C, an output row (Hs, Vs) synchronizing signal and RGB (be Red is red, Green is green, Blue blue) three primary colors pumping signal, row treatment circuit 90 and vertical output circuit 100 are at described row (Hs, Vs) the stable row-field scanning electric current of output in the field deflection of being expert under the control of synchronizing signal; RGB three primary colors after the conversion are through looking amplification module 70 excitations amplification rear drive picture tube 80 cathode emission electronics and the field deflection of being expert at control imaging down.Sound accompaniment processing module 30, look amplification module 70, DPTV60 and a row treatment circuit 90 and pass through I by CPU110 ²The C bus is controlled.

Consistent with the simulated television platform in the utility model except that the other parts of digital processing part, below in conjunction with Fig. 2 the operation principle of digital processing part is described in detail, the digital processing scheme of TRIDENT company is partly adopted in the utility model digital processing.

Be illustrated in figure 2 as the utility model digital signal processing module DPTV principle schematic, anolog TV signals (comprise composite video signal CVBS, the Y/U light tone is separated the S terminal signals, the YUV separation signal) in television decoder through switching gate, automatic gain control, the A/D conversion, carry out light tone by comb filter and separate back decoding output 50Hz field frequency, the RGB digital signal of 15k line frequency, under the control of frame frequency controller, be temporarily stored into the frame frequency buffer with one times of fast data, and read with different speed by fixing 23KHz line frequency by frame rate converter, realization is to the 75Hz interlacing, 60Hz line by line, the frame frequency conversion of 50Hz interlacing, signal after the conversion carries out the dynamic scan velocity modulation in the key frame display module, 14 kinds of dynamic images such as noise reduction are handled between dynamic frame, automatically regulate picture tone, saturation, brightness, contrast etc., make it to reach the optimum balance state, the processed video signal mixes with the image windows user interface (OSD) of being drawn down by CPU control, send into D/A (D/A) converter through the brightness adjustment, output analog rgb tristimulus signals; On the other hand DPTV utilize clock phase-locked loop accurately the control figure phase-locked loop from composite video signal, separate the trip field sync signal, the stable row-field scanning electric current of output in the field deflection of being expert at of the row treatment circuit behind the isolated capable field sync signal control DPTV.

The utility model realizes that with fixing 23K line frequency the interlacing scan of collection 75Hz high stable, 60Hz line by line scan, three kinds of patterns of the high-accuracy interlacing scan of 50Hz are the changeable digital processing television of one.In the ordinary course of things, adopt the pattern of 75Hz interlacing to teleview, the user can carry out mode switch by the button on the remote controller, selects optimal mode to watch different TV programme, eliminate large-area flicker, interline flicker, and realized the frequency conversion function of digital processing television.

Claims

1, a kind of digital processing television, radiofrequency signal is exported intermediate-freuqncy signal after high-frequency tuner (10) amplifies mixing, in middle amplification module (20), go out composite colour television signal through the intermediate frequency amplification demodulator, and frequency discrimination obtains second accompanying sound intermediate frequency signal, described second accompanying sound intermediate frequency signal is sent to exports sound accompaniment by loud speaker (50) after (30) and audio power amplifier module (40) are handled in sound accompaniment, it is characterized in that: described composite video signal is sent into digital signal processing module (60), described digital signal processing module (60) carries out the row-field scanning frequency translation under total line traffic control, output RGB three primary colors pumping signal and row field sync signal, row treatment circuit (90) the output row-field scanning electric current in the field deflection of being expert under the control of field sync signal of being expert at; RGB three primary colors after the conversion are amplified rear drive picture tube (80) cathode emission electronics and the field deflection of being expert at control imaging down through looking amplification module (70) excitation.

2, digital processing television according to claim 1, it is characterized in that: described composite video signal is separated with light tone after S terminal signals, YUV separation signal send into digital signal processing module (60), in decoder through switching gate, automatic gain control, the A/D conversion, carry out the RGB digital signal that light tone is separated back decoding output 50Hz field frequency, 15k line frequency by comb filter, under frame frequency controller control, be temporarily stored into the frame frequency buffer with one times of fast data, with different speed read realization to 75Hz interlacing, 60Hz line by line, the frame frequency conversion of 50Hz interlacing.

3, digital processing television according to claim 2, it is characterized in that: the signal behind the described frame frequency conversion carries out dynamic image in the key frame display module of digital signal processing module (60) handles, the processed video signal mixes with the image windows user interface (OSD) of being drawn down by CPU control and sends into the D/A converter through the brightness adjustment, output analog rgb tristimulus signals.