CN1178428A

CN1178428A - Superimposing apparatus and method for video appliance

Info

Publication number: CN1178428A
Application number: CN97113703A
Authority: CN
Inventors: 李广宰
Original assignee: LG Electronics Inc
Current assignee: LG Electronics Inc
Priority date: 1996-06-12
Filing date: 1997-06-12
Publication date: 1998-04-08
Anticipated expiration: 2017-06-12
Also published as: KR980007724A; KR100206784B1; CN1148956C

Abstract

The present invention provides a superimposed apparatus for video instrument, including signal decoder for generating inside image signal as lyric signal and lyric synchronization signal having lyric position data, a controller for estimating whether outside image signal exists ,and whether NTSC method is adopted then complete controlling operation when the outside image signal exists, a first selector for selecting inside signal as inside image when NTSC method is adopted in the case that outside image signal is exist or not, and selecting the lyric synchronization signal outputted from the image signal decoder and a outside image signal when image signal exists.

Description

The stacking apparatus and the method that are used for video equipment

The present invention relates to wherein stacking apparatus, relate in particular to stacking apparatus and the method for being convenient to externally carry out between the picture signal and inner picture signal the video equipment of picture signal exchange by the karaoke OK system of lyrics signal overlay drafting signal.

Stack refers to external signal is superimposed upon technology on the inner TV picture signal.

Yet conventional superimposing technique has a defective, promptly carries out overlap-add procedure during superposeing continuously, interrupts irrelevant with the input of outside picture signal.

Further, the PAL method is different with being applied to, and when outside picture signal is applied to NTSC (NTSC National Television Systems Committee) method, may switch display size and lyrics font size during superposeing, and causes the user to obscure like this.

Therefore, the purpose of this invention is to provide a kind of stacking apparatus and method of externally carrying out the picture signal exchange between the picture signal and inner picture signal of being used for being convenient to, the existence of these apparatus and method and external signal or broadcasting method have nothing to do.

For achieving the above object, a kind of stacking apparatus that is used for video equipment according to the present invention is provided, comprise the inside picture signal that is used for producing in addition as lyrics signal, picture signal decoder with synchronous lyrics signal with lyrics position data, be used to judge whether to exist an outside picture signal and when having an outside picture signal, whether adopt the NTSC method, and the controller of executive control operation, there is not an outside picture signal or having an outside picture signal with being used for, select inner picture signal picture as a setting when this outside picture signal adopts the NTSC method, and when having a picture signal, select from the synchronous lyrics signal of picture signal decoder output and the first selector of an outside picture signal.

Further, for achieving the above object, a kind of stacking apparatus that is used for video equipment according to the present invention is provided, comprise first switch unit that is used for exporting selectively the pair of outer picture signal according to first switch-over control signal, be used for separating the sync separator of vertical synchronizing signal from the picture signal that first switch unit is selected, be used for judging whether to exist an outside picture signal and when having an outside picture signal according to vertical synchronizing signal, whether this outside picture signal adopts the NTSC method, and export the controller of each control signal, be used for producing in addition inside picture signal as lyrics signal, picture signal decoder with synchronous lyrics signal of lyrics position data, with the control signal that is used for logical operation slave controller output with from the logical circuit of the synchronous lyrics signal of picture signal decoder output, and be used for according to the picture signal of selecting from second switch-over control signal output of logical circuit output from first switch unit or from second switch unit of the inside background frame signal of picture signal decoder output.

Further again, for achieving the above object, a kind of stacking method that is used for video equipment according to the present invention is provided, comprise the steps: when connecting the background switch key, to check the current background picture, in the number of transitions of scheduled time counting from the vertical synchronizing signal of outside picture signal detection, the number of transitions and the current number of transitions of counting are compared, and judge the existence and the broadcasting method of outside picture, and when not having outside picture signal or have an outside picture signal according to judging, and should select an inner picture signal to be used for background frame during outside picture signal employing NTSC method, and when having a picture signal, select an outside picture signal to be used for background frame.

Fig. 1 is the block diagram that is used for the stacking apparatus of video equipment according to the present invention;

Fig. 2 A is the timing diagram of each signal in Fig. 1 circuit to 2E; With

Fig. 3 is the flow chart of the background frame handover operation in key diagram 1 circuit.

Be used for stacking apparatus block diagram shown in Figure 1 of video equipment according to the present invention as expression, this device comprises: first switch unit 10 is used for exporting the pair of outer picture signal selectively according to switch-over control signal CNT1; Sync separator 20 is used for separating vertical synchronizing signal V-SYNC from first switch unit, 10 selected pictures; Controller 30 if be used to judge whether to exist outside picture signal or have outside picture signal, just judges that whether this outside picture signal is fit to the NTSC method, and export a plurality of control signals; Picture decoder 40, the synchronizing signal that is used to provide the inside picture signal of the expression lyrics and has the position data of the lyrics; Logical circuit 50 is used for the control signal EN/DIS of logical operation slave controller 30 outputs and the synchronous lyrics signal LYRIC-SYNC that exports from picture decoder 40, and output switch-over control signal CNT2; With second switch unit 60, be used to export from the picture signal of first switch unit, 10 selections or the inside background frame signal of exporting from picture decoder 40.

Controller 30 can comprise a single multivibrator and microcomputer, and logical circuit 50 can comprise an OR-gate.

Referring now to accompanying drawing the stacking apparatus that is used for video equipment that constitutes like this will be described.

In karaoke OK system, when the user pushed background switch key (not shown), controller 30 was discerned the background frame of current demonstration and is determined whether to switch the background frame of a song lyrics.

Simultaneously, by the signal that background frame provides, have from an outside picture signal of first switch unit, 10 selections and the inside picture signal of exporting from picture decoder 40.This inside picture signal is incorporated song lyrics into.

Therefore, the background frame of the current demonstration of controller 30 identifications, and determine whether to exist outside picture signal or outside picture signal whether to adopt the NTSC method, thus switch background frame.Now the handover operation that provides thus will be described.

At first, when an inner picture signal is applied to the background frame of current demonstration, and when not having the outside picture signal of input, keep current state.

The second, when an inner picture signal is applied to the background frame of current demonstration, and when importing an outside picture signal, be the outside picture signal that this background frame is selected input.

The 3rd, when an inner picture signal is applied to the background frame of current demonstration, and during input pair of outer picture signal, for this background frame selects this to outside picture signal.Simultaneously, the first outside picture signal is endowed priority in selection.

The 4th, when the background frame of current demonstration is the first outside picture signal or when being the second outside picture signal, be necessary for this background frame and select an inner picture signal.

The 5th, although apply one or two outside picture signal, when the external signal that is applied is fit to the NTSC method, is necessary for background frame and selects an inner picture signal.

Suppose when at present showing the inside picture signal that comprises the current lyrics, apply a background switching signal by the user.

When applying a background switching signal, controller 30 is checked (step ST10, ST11) this background frame, shown in Fig. 2 E, and output switch-over control signal CNT1.Here, when switch-over control signal CNT1 is high level, first switch unit, 10 outputs, first picture signal, and when switch-over control signal CNT1 is low level, first switch unit, 10 outputs, second picture signal.

Be both, sync separator 20 is from such vertical synchronizing signal V-SYNC shown in the picture signal separation graph 2A of first switch unit 10 output and the 2C, and separation signal V-SYNC is applied to controller 30, controller 30 is converted to the vertical synchronizing signal V-SYNC shown in Fig. 2 A has 1/2 working method (duty) and T counting (step ST12) number of transitions n at the fixed time shown in Fig. 2 B and the 2D, be the PAL method thereby determine whether to exist an outside picture signal or should the outside picture signal adopt the NTSC method.

That is, controller 30 compares count value and preset value, if preset value greater than count value, just determines to apply an outside picture signal, and if preset value less than count value, just judge that (step ST13) do not apply outside picture signal.

Simultaneously, when judgement applied a picture signal, controller 30 was used to determine that the outside picture signal that is applied is about the NTSC method or about PAL (pahse alternation line color television) method.Wherein, when the number of transitions n of counting was 2 * 60 * T, outside picture signal was judged as the NTSC method that adopts, and when the number of transitions n of counting was 2 * 50 * T, outside picture signal was judged as the PAL method that adopts.

In addition, be set at number of transitions n under the situation of the median between 2 * 60 * T and 2 * 50 * T, if count value is greater than median, the picture signal that uses is judged as the signal that adopts the NTSC method, if and count value is less than or equal to median, the picture signal of use is judged as the signal that adopts the PAL method.

Therefore, when applying an outside picture signal, and when the picture signal that applies is not the signal of (step ST14) employing NTSC method, controller 30 is not to logical circuit 50 output initiating signal EN so that from picture decoder 40 output synchronous lyrics signals, and logical circuit 50 is exported a switching control CNT2 thus with initiating signal EN and the addition of synchronous lyrics signal logic, thereby output is by first or second picture signal of second switch unit 60 output, and makes its can superpose (step ST15, ST16).

Simultaneously, when not applying outside picture signal, when the picture signal that perhaps applies adopts the NTSC method, controller 30 is to logical circuit 50 output inhibit signal DIS, this logical circuit is exported switching controls CNT2 thus with inhibit signal DIS with from the synchronous lyrics signal logic addition of picture decoder 40 output.

60 outputs of second switch unit comprise from the inside picture signal of the lyrics signal of picture decoder 40 outputs, thereby start stack (step ST17, ST16).

Simultaneously, when not applying outside picture signal during overlap-add procedure, level of using in picture decoder 40 and vertical synchronizing signal are eliminated with pixel clock signal or become wrongly, therefore do not use picture decoder 40 to handle vision signal.

Like this, during the overlap-add procedure when not applying the outside picture signal that is shown as background signal, controller 30 returns the state of inner background frame, thereby finishes the stable operation of picture decoder 40.

In addition, the stacking apparatus that is used for video equipment according to the present invention play control by the phase place that is adjusted to outside picture signal incorporate lyrics signal into colored synchronously.

As mentioned above, the stacking apparatus that is used for video equipment according to the present invention is convenient to the handover operation of outside and inner picture signal according to external signal that exists and broadcasting method during overlap-add procedure, thereby prevents video equipment by faulty operation, improves reliability thus.

As an example rather than to the qualification of claim, can be expressly understood that those skilled in the art might make multiple replacement, modification and improvement to the present invention according to the abovementioned embodiments of the present invention.

Claims

1. stacking apparatus that is used for video equipment comprises:

The picture signal decoder is used for producing in addition as an inner picture signal of lyrics signal and the synchronous lyrics signal with lyrics position data;

Controller is used to judge whether to exist an outside picture signal and when having an outside picture signal, whether this outside picture signal adopts NTSC (NTSC National Television Systems Committee) method, and executive control operation; With

First selector, be used for not having outside picture signal or having an outside picture signal, and should select inner picture signal picture as a setting during outside picture signal employing NTSC method, and when having picture signal, select from the synchronous lyrics signal and the outside picture signal of the output of picture signal decoder.

2. device according to claim 1 also comprises second selector, is used for selecting a plurality of outside picture signals according to the control operation of controller.

3. whether device according to claim 1 is wherein according to existing vertical synchronizing signal to determine whether to exist the judgement of outside picture signal.

4. device according to claim 1 is wherein determined the NTSC method by the number of transitions of counting vertical synchronizing signal.

5. device according to claim 4 wherein when the number of transitions of vertical synchronizing signal reaches 2 * 60 * T, determines that outside picture signal is for adopting NTSC method (T express time) here.

6. device according to claim 4 wherein when the number of transitions of vertical synchronizing signal reaches 2 * 50 * T, determines that outside picture signal is for adopting PAL (pahse alternation line color television) method (T express time) here.

7. stacking apparatus that is used for video equipment comprises:

First switch unit is used for exporting the pair of outer picture signal selectively according to first switch-over control signal;

Sync separator is used for separating vertical synchronizing signal from the selected picture signal of first switch unit;

Controller is used for judging whether to exist an outside picture signal and when having an outside picture signal, whether this outside picture signal adopts the NTSC method, and exports each control signal according to vertical synchronizing signal;

The picture signal decoder is used for producing in addition as the inside picture signal of lyrics signal and the synchronous lyrics signal with lyrics position data; With

Logical circuit is used for the control signal of logical operation slave controller output and the synchronous lyrics signal of exporting from the picture signal decoder; And

Second switch unit is used for according to exporting from the picture signal of first switch unit selection or the inside background frame signal of exporting from the picture signal decoder from second switch-over control signal of logical circuit output.

8. stacking method that is used for video equipment comprises step:

When connecting the background switch key, check the current background picture;

In the number of transitions of scheduled time inside counting from the vertical synchronizing signal of outside picture signal detection;

The number of transitions of counting and current number of transitions are compared, and determine the existence and the broadcasting method of outside picture signal; With

When having an outside picture signal according to determining there is not outside picture signal or working as, and should select an inner picture signal to be used for background frame during outside picture signal employing NTSC method, and when having a picture signal, select an outside picture signal to be used for background frame.