CN1878249A

CN1878249A - Fade-in fade-out type TV frequency channel switching method

Info

Publication number: CN1878249A
Application number: CNA200510017819XA
Authority: CN
Inventors: 白峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-07-25
Filing date: 2005-07-25
Publication date: 2006-12-13

Abstract

The invention relates to a method for switching the TV programs by fade-in fade-out type. Wherein, it is characterized in that: at the instant of switching programs, the image of front image (brightness and contrast) and sound are decreased stepped, as fade-in; and the image (brightness and contrast) and sound of next program are increased stepped as fade-out. The invention can e used in analogue and digit TV. And it has the advantages that: 1, it can effectively reduce the impacts of image and sound when switching the programs; 2, and the instant that switching the programs, there is still image; 3, at the instant that switching the programs, the fade-in fade-out effect gives beautiful watch.

Description

The method of fade-in fade-out type TV frequency channel switching

Technical field

The technical field of the invention is a television set manufacturing industry, relates to a kind of method of TV frequency channel switching or rather.

Background technology

The common methods of current TV frequency channel switching mainly contains several like this: 1, directly switch; 2, first blank screen switches again; 3, static screen switches again earlier.

Directly during TV frequency channel switching,,, influence viewing effect so the user can see a unsettled image state because the tuner of television set carries out when frequency is switched a process of locking frequency again being arranged.

Elder generation's blank screen is the method for TV frequency channel switching again, tends to bring bigger visual contrast and impact.Wherein, bigger contrast can influence the switch speed of display screen, thereby has increased the time of switching channels; Bigger impact then can influence the life-span of television picture tube (or its equivalent device) to a certain extent.And in the blank screen without any amount of information, this has influenced viewing effect to a certain extent.

Earlier the static screen method of TV frequency channel switching has again had certain progress compared with above-mentioned two kinds of methods, and this method is a last frame image before the static switching channels earlier, wait tuner to retune and stable after switch picture material again.If but the screen contrast is bigger before and after the switching channels, this method still can be brought discomfort to human eye.And because the static back of dynamic image definition is very limited on the TV, actual viewing effect is not good.

Simultaneously, three kinds of methods are not considered the impact that the image sound accompaniment may bring behind the switching channels more than.If the image sound accompaniment is comparatively quiet before the switching channels, and sound accompaniment is stronger after switching, and then can bring bigger acoustic shock, influences viewing effect, has also influenced the life-span of TV loudspeaker simultaneously to a certain extent.

Summary of the invention

The present invention proposes a kind of method of fade-in fade-out type TV frequency channel switching, it is characterized in that: switch moment at channel, the image of last channel (comprising the brightness and contrast) harmony cent is not with a fixed step size diminuendo, promptly " fade in ", image (comprising the brightness and contrast) the harmony cent of back one channel is not with a fixed step size crescendo, promptly " fade out ", and the two has an of short duration mixing together phase.

Described method both can be applied to simulated television, also can be applied to digital television.

Described method is specially when being applied to simulated television, for the dual tuner television set, after the user assigns the switching channels instruction, the channel content of current tuner is constant, image and sound are carved in due course and (can be delayed time slightly, can not delay time yet) beginning " fading in ", simultaneously with search of second tuner and lock onto target channel, after treating signal stabilization, new signal is superimposed upon on the original signal and " fades out ", so image of " fading in ", " fading out " and sound all are dynamic in the said process, " being fade-in fade-out " effect is ideal.For the single tuner television set, after the user assigns the switching channels instruction, last frame image before the static switching channels of elder generation, and carve " fading in " in due course, it is quiet that sound keeps, make tuner search and lock onto target channel, after treating signal stabilization, new signal is superimposed upon on the original signal and " fades out ", so the image of " fading in " is static, sound is quiet, and image of " fading out " and sound all are dynamic.

When described method was applied to digital television, above-mentioned tuner also comprised its corresponding decoder.Further, in digital television, the method of fade-in fade-out type switching channels is similar with above-mentioned simulated television, the part that only relates to signal processing is different because of the difference of simulation, digital signal, and the process of switching channels comprises the course of work of tuner and the course of work of digital signal decoder.

Outstanding advantage of the present invention is:

1, reduced effectively by the impact that image harmony vocal cores comes, to have protected spectators' eyesight, hearing, and prolonged the life-span of television picture tube (perhaps its equivalent device) and loud speaker to a certain extent before and after the TV frequency channel switching;

2, in the moment of television set switching channels, still have the content that can view and admire, brought certain amount of information incessantly for spectators, reduced the worry of waiting for when changing platform;

3, the moment of switching channels,, brought the brand-new enjoyment of viewing and admiring to spectators just as fade-in fade-out type transitions in the films and television programs.

Description of drawings

Fig. 1 implements sequential chart of the present invention.

Fig. 2 is that simulated television is implemented flow chart of the present invention.

Embodiment

The implementation process that the present invention is directed to simulated television is as follows: (referring to Fig. 1)

1, at t ₀Constantly, the user assigns the instruction of TV frequency channel switching;

2, since the tuner of television set again the lock onto target channel need the regular hour, can behind suitable time-delay, (can not delay time) yet, be set in t ₁Constantly begin " fading in ", wherein t ₁∈ [t ₀, t ₂], t ₂Be that channel switches the moment that the back tuner has stable output.Be specially, from t ₁Constantly begin, the image of last channel (comprising the brightness and contrast) harmony cent is with a fixed step size diminuendo, and to t ₂In the time of constantly, the image and the sound of " fading in " channel do not have complete zero setting.For the dual tuner television set, image that this " fades in " and sound are dynamic all the time, and concerning the single tuner television set, this image that " fades in " is a last frame image before the switching channels, and sound is quiet;

3, t ₂Constantly, the content of switching the back channel beginning of " fading out ".Be specially, switch the image (comprising the brightness and contrast) of back channel and sound with the fixed step size crescendo of starting from scratch, and be superimposed upon on the image and sound that " fades in " front, what at this time spectators watched is the image and the sound of mixing together;

4, t ₃Constantly, the image and the sound crescendo of switching back channel reach normal.Simultaneously, the image of last channel and fade-out are zero.The handoff procedure of " being fade-in fade-out " finishes.

Simulated television is implemented flow chart of the present invention referring to Fig. 2.

When described method was applied to digital television, above-mentioned tuner also comprised its corresponding decoder.If the television channel that relates to switching is not on same physical channel, then the changing method of fade-in fade-out type is similar with above-mentioned simulated television, and just the back-end realization scheme is different because of the difference of simulation, digital signal.If the television channel that relates to switching is on same physical channel, then need not retune, the associative operation that only needs again the channel searching identifier and decode gets final product, the method of specifically being fade-in fade-out is analogous to above-mentioned simulated television, and " decoding " and " decoder " that " tuning " and " tuner " in just narrating is replaced by correspondingly gets final product.

Claims

1, a kind of method of fade-in fade-out type TV frequency channel switching, it is characterized in that: switch moment at channel, the image of last channel (comprising the brightness and contrast) harmony cent is not with a fixed step size diminuendo, promptly " fade in ", image (comprising the brightness and contrast) the harmony cent of back one channel is not with a fixed step size crescendo, promptly " fade out ", and the two has an of short duration mixing together phase.This method both can be applied to simulated television, also can be applied to digital television.

2, as claim 1 described method, for dual tuner (or its equivalent device) television set, after the user assigns the switching channels instruction, the channel content of current tuner (or its equivalent device) is constant, image and sound are carved in due course and (can be delayed time slightly, can not delay time yet) beginning " fading in ", use second tuner (or its equivalent device) search and lock onto target channel simultaneously, after treating signal stabilization, new signal is superimposed upon on the original signal and " fades out ", so in the said process " fading in ", image that " fades out " and sound all are dynamic, and " being fade-in fade-out " effect is ideal.

3, as claim 1 described method, for single tuner (or its equivalent device) television set, after the user assigns the switching channels instruction, last frame image before the static switching channels of elder generation, and carve " fading in " in due course, it is quiet that sound keeps, make tuner (or its equivalent device) search and lock onto target channel, after treating signal stabilization, new signal is superimposed upon on the original signal and " fades out ", so the image of " fading in " is static, sound is quiet, and image of " fading out " and sound all are dynamic.

4, as claim 1,2,3 described methods, when being applied to digital television, above-mentioned tuner also comprises its corresponding decoder.Further, in digital television, the method of fade-in fade-out type switching channels is similar with above-mentioned simulated television, the part that only relates to signal processing is different because of the difference of simulation, digital signal, and the process of switching channels comprises the course of work of tuner and the course of work of digital signal decoder.