CN1463143A - Processing method of changing channels in still TV screen - Google Patents

Abstract

The processing method includes the procedures: displaying a still frame, changing a channel and eliminating unsteady appearance, then displaying images. Thus, in process of changing TV station, a stable still image frame can be watched by users so that it does not change light ray in the environment, eliminating visual impaction. A still image may attract users so as to alleviate annoyance in the time for waiting the channel to be changed. The method raises performances of using TV set.

Description

The static screen method of changing channels of TV

Technical field

The technical field of the invention is the TV manufacturing industry, specifically is the processing method that a kind of video screen changes platform.

Background technology

Processing method has several when changing platform in the current TV: 1) directly switch; 2) blank screen; 3) first blank screen brightens gradually again.

Method with direct switching, be to convert directly to another TV programme from last TV programme, because tuner carries out when frequency is switched a process of locking frequency again being arranged, so the user can see a judder state, machine has not generally made in this way very much now.

TV is used the method for blank screen always now, elder generation is with the screen blackening when promptly changing platform, transform to another TV programme again, after image stabilization, remove blank screen, make the user can't see the judder state, but this method has strong impact to people's vision, particularly do not have at night under the situation of background light, blank screen will cause indoor as dark as a stack of black catsly brighten suddenly again, and the people is far from suitable.

The method that elder generation's blank screen brightens gradually again, elder generation is with the screen blackening when promptly changing platform, transform to another TV programme again, after image stabilization, screen is brightened gradually up to normally, but this method also there is the time of eliminating labile state by blank screen, brightens gradually when just eliminating the impact of vision from black brightening, increased the time of changing platform in fact on the contrary, the process of blank screen still has strong impact to people's vision.

Summary of the invention

Shock problem to vision when the present invention is directed to judder state and blank screen when changing platform proposes a kind of effective solution: static screen changes and image is shown after platform is eliminated labile state again earlier.Static screen method of changing channels of the present invention comprises the following steps:

The static present image picture of elder generation when 1) changing platform;

2) make TV quiet, eliminate acoustic shock when changing platform;

3) refresh the tuner data, it is operated on the target frequency;

4) wait for that the suitable time makes tuner output stable;

5) detection has or not line synchronizing signal, and having then changes the 6th) step, do not have and then export blue screen, change the 11st) step;

6) detected image standard;

7) reset the TV output format at the present image standard;

8) cancellation mute state;

9) cancellation inactive state;

10) displayed image;

11) enter normal condition.

The advantage of rest image method of changing channels of the present invention is: changing what see in the platform process like this is stable static image frame, rather than the judder state; Can not cause variation, thereby eliminate impact vision to ambient light; Perhaps also can attract the user to go to see the still image content,, thereby alleviate the worry of waiting for when changing platform because static picture material has comprised many information as photo.This method has improved the serviceability of TV, and changes at TV and to obtain significant improvement aspect the platform.

Description of drawings

Fig. 1 is the static screen method of changing channels of a TV flow chart.

Embodiment

Below be the program of one embodiment of the invention, in order to further specify the present invention.But the present invention is not imposed any restrictions.Other programs of making under technical scheme of the present invention all fall into protection scope of the present invention.

#define YES 1 #define NO 0 unsigned char g_tunerl_timer, g_tunerl_st; Bit bHSYNC; Void main_tuner () if (g_tunerl_timer==0) // judge the stand-by period whether then switch (g_tunerl_st) { case 0 :/* nomal*/break; Case 1 :/* first mute*/g_tunerl_timer=C_20MS4; // setting stand-by period audio_mute (YES); // quiet freeze_screen (); // static screen ++ g_tunerl_st; // to next step break; Case 2 :/* pll output*/tunerl_write (); // refresh the tuner data to target channel g_tunerl_timer=C_100MS4; // set stand-by period 100ms, stable to wait for tuner output ++ g_tunerl_st; // to next step break;＜!--SIPO＜DP n=" 2 "〉--〉＜dp n=" d2 "/case 3:bHSYNC=Hsync_check (); // detect row synchronously, { // judgement has or not synchronous system_cbeck () with the judgement current channel no signal if (bHSYNC==1); // if signal, detected image standard arranged ++ g_tunerl_st; // arrive next step } else{ blue_screen (); If // no signal is set blue screen g_tunerl_st=0; // finish to change platform, get back to the state of normally watching } break; Case 4:system_data_set (); // according to detected video standard, set corresponding output format g_tunerl_timer=C_200MS4; // setting stand-by period break; Case 5:audio_mute (NO); // quiet unfreeze_screen (); The static g_tunerl_st=0 of // cancellation screen; // finish to change platform, get back to and normally watch state break;

Claims (1)

1. the static screen method of changing channels of television set is characterized in that, comprises the following steps:

The static present image picture of elder generation when 1) changing platform;

2) make TV quiet, eliminate acoustic shock when changing platform;

3) refresh the tuner data, it is operated on the target frequency;

4) wait for that the suitable time makes tuner output stable;

5) detection has or not line synchronizing signal, and having then changes the 6th) step, do not have and then export blue screen, change the 11st) step;

6) detected image standard;

7) reset the TV output format at the present image standard;

8) cancellation mute state;

9) cancellation inactive state;

10) displayed image;

11) enter normal condition.

Images