JPS6031364A - Mixing device - Google Patents

Abstract

PURPOSE:To eliminate the need for multiplication at each superimposition by multiplying a video signal obtained by mixing with the 1st effect control signal with the 2nd effect control signal, adding the result at an output adder circuit and outputting the added result. CONSTITUTION:An effect control signal KFF is given to an effect control signal line CONT13 to operate an EF series when the 1st effect mode is designated, an inoperative signal is given to the other and also, a control signal of logical [1] is given to an input line of the signal KFF in a re-entry control circuit RE via a switch all so as to keep the re-entry signal GC3 to logical [1]. This signal is inverted and given mulitplication circuits AM1, AM2 as re-entry signals GC1, GC2. As a result, the mixing circuit MK13 is operated, and after an output S13 is multiplied by ''1'', and then transmitted to an output adder circuit AD15 and no video signal is transmitted to the output adder circuit AD15 from the AB series and the CD series. Thus, the video signal of the EF series is transmitted as it is from the output adder circuit AD15.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a mixing device, and particularly to one that obtains various video effects by controlling and mixing a plurality of video signals, for example, television signals. .

[Background technology and its problems]

In this type of mixing device, in order to create screens with various video effects, multiple mixing circuits are prepared, and the input video signal is passed through these multiple mixing circuits in cascade to obtain a mixed output signal. In other words, as shown in FIG.
IK2, MR3 fi: fru. Each mixing circuit MKI to MK3 has two input lines A and B-.
E and F'&, and input video signals provided through switches provided at the intersections of these input lines and four signal lines to which a plurality of input video signals VDI to VD3 are provided, respectively. The signals are added in an adder circuit ADI via multiplier circuits M1 and M2 having a variable gain amplification circuit configuration to obtain output signals 81 to S3, respectively.

For example, the mixing circuits MKI-MK3 include signal lines that give 1 to 3 to three effect control signals, and input lines C0NTl to C (to which the selected effect control signal is applied via a switch provided at the intersection with JNT3). , ~KEF.Here, the mixing circuit NIKI~MK3 is applied directly to the gain control terminal of the multiplication circuit M1, and is also applied as a compensation signal to the gain control terminal of the multiplication circuit M2 via the inverter INI'&, thus the mixing circuit MKI~1V
In fK3, effect control signals C0NTl to C0NT3
By controlling the ratio of the two input video signals inputted by the adder circuit ADI, the added output signals 81 to S3 are obtained.

To the effect control signals applied to the input lines C0NTl~C0NT3, ~Kg1F sets the gain for the multiplier circuits M1 and M2 over time so that various effects such as mix, wipe, key, key and mix, key and wipe can be obtained. 57, and thus the addition output signals 81 to S3 are added to the input video signal to the effect video signal KAB-K]! ! 2. Can you obtain a video signal with the added effects added?

In this way, each of the mixing circuits MKI to MK3' mixes the two input video signals to produce a predetermined effect 7a=
However, in order to obtain various mixing effects, the addition output obtained at the output end of one mixing circuit is re-entered into one input line of the other mixing circuit, so that the effect can be achieved sequentially. Control signal C0NI'l
~Control '4r of CON'J'3: The video effects on both sides that can be obtained in each mixing circuit are sequentially superimposed by repeating the process. For example, in the case of FIG. 1, the input signals VE11 and VD2 are applied to the mixing circuit IVIK2 through the input lines C and I) to generate the effect control signal K. When the first video effect by D is added and sent as the addition output s2, the second addition output s
2 is re-entered into the mixing circuit ~jK1 via input line B. An input video signal Vl)3 is applied as the other input to the mixing circuit MKI through an input line A, and an addition output S] on which the second video effect is superimposed is outputted by the effect control signal KAB. This addition output s1 is further re-entered into the input line E, and input video signal V in the mixing circuit MK3.
D4 is mixed so as to superimpose the video effect on the effect control signal, and thus the mixing circuit MK3
Addition output S3 or mixing output I-U PG obtained in
Sent as M.

According to the conventional configuration shown in axis 1, IJ connects a cascade of multiple mixing circuits; since each mixing circuit is made to have a +a effect of M, the mixing of the number of boards is Every time the input image passes through the circuit, it passes through the circuit of the number of boards. In other words, in the case of Figure 1, human power body signal ■l) 1 and VD
2 passes through the multiplier circuits M1 and M2 of the mixing circuit MK2, the honor circuits M1 and M2 of the mixing circuit MK1, and the honor circuits iv'11 and M2 of the mixing circuit MK3 in the 110th order.
follows the mixing circuit to the honor circuit M1 of IK1 and the honor circuit IVi1 of the mixing circuit MK3. When passing through multiple honor circuits in this way, each honor circuit rounds (rounds off) the multiplication result and sends the multiplication result output, so if the rounding threshold nY< As a result, the errors accumulate, and as a result, the degree of deterioration of each picture signal of the video signal included in the mixing output signal @PG/J is partially different, which inevitably results in an unsightly image. At the same time, a phase error occurs in the signal during multiplication in the multiplication circuits of each stage, so a relay circuit must be provided to correct this error, which inevitably complicates the overall configuration.

[Purpose of the invention]

The present invention has been made in consideration of the above points A, and attempts to propose a mixing circuit that does not require the use of a multiplication circuit in order to obtain the 51 tatami effect of a unique video signal as shown in Fig. 1. It is something to do.

[The shield of invention, the main point]

In order to achieve such an object, in the present invention, video signals obtained by mixing with first effect control signals in a plurality of mixing circuits are multiplied by a second effect signal in corresponding multiplication circuits. After that, they are added in an output adding circuit, and the added output is sent out as a mixing output signal.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings. In FIG. 2, MKIl, MK12. MK13 is a mixing circuit which has the same configuration as the mixing circuit described above with reference to FIG. 1, and corresponding parts to those in FIG. 1 are designated by the same reference numerals. In this case, the mixing circuit MKI
I, MK12. The MK13 has human power lines A and B, C and A, E and F, respectively, and each input line and a plurality of, for example, N input video signals VDI, VD2...VDN.
Two input video signals are selected via a switch provided at the intersection with the input line of the mixing circuit MK.
11 to MK13. Furthermore, the mixing circuit MK11. Effect control signal KA is applied to MK12 and MK13.
B * 1 (CD, KBy is multiple, for example, M input effect control signals, 1 to KM signal lines and input line CO
It is selectively obtained via a switch provided at the intersection of N Tll to C0NT13. In this embodiment, the effect control signals C0NTII to C0NT13 have the same effects as in the case of FIG. 1, which give 141 effects such as mix, wipe, key, key and mix, key and wipe to the video signal. .

Mixing circuit MKII, MK12. MK13 addition output 811. S12.813 is an adder circuit ADII,
Re-entry multiplication circuit A via AD12°AD13
M1. AM2 and AM3 are respectively applied, and their outputs are added and combined in an output adder circuit A D 15, and then sent out as a mixing output signal PGM.

31-+ entry multiplication circuit AMI, AM2. AM3
is a variable gain amplifier, and receives at its control input a reentry signal GC'l sent from the reentry control path RE.
, GC2, GC3 are given. Reentry control circuit R
E selects the effect control signals KAB and KBF given to the effect control signal lines C0NTII to C0NT13 in accordance with the effect mode separately designated by the operator in a predetermined priority order corresponding to the effect mode, and also selects the effect control signals KAB and KBF as necessary. Multiplying circuit AMI for re-entry after arithmetic processing
A reentry signal Gel~GC3'Y for ~AM3 is generated.

That is, the reentry control circuit RE has a multiplier circuit 1 having a variable gain amplifier configuration, and its input line 2 receives effect control signals KAB and K applied to effect control signal lines C0NTII and C0NT12. D is given through switches a8 and a9 and the power 7it[! X! The effect control signal of the effect control signal line C0NT13 is connected to the variable gain control end of the l path 1 via the switch &10%: and then the inverter 3.
given through. This effect control signal ヮ is added to the output of the multiplier circuit 1 in the adder circuit 4, and the added output is inverted by the inverter 5 to generate the reentry signal GC.
It is coupled to the I and GC2 signal lines via switches a1 and a5. Similarly, reentry signals GCI and G
The output of multiplier circuit 1 is connected to switch a on the signal line of C2.
3 and a7, and the output of inverter 3 is coupled through switches a2 and a5i, and %i
t+ buried r OJ level (earth level) signals are coupled via switches aO and a41. In addition to this, the effect control signal obtained via the switch alo is given as an entry signal GC3 to the multiplication circuit AM3. In this embodiment, a logic "1" signal source is coupled to that signal line via a switch ALL, so that it can be switched to a logic "1" or "0".

In the case of the embodiment shown in FIG. 2, adder circuits A D 11 to AD]
3, back color effect signals BCI to BC3 for partially adding back color to the screen are video signals 811 to 3.
It is given to be added to S13.

Further, the outputs of the adder circuits ADII to AI) 13 are sent to the preview signal line 10 through switches a15 to a17, respectively.
is given to the adder circuits AD11 to AD1.
The image based on the video signal obtained at the output terminal of 3 (that is, the image of Mtl which is added and synthesized in the output adder circuit AD15) can be individually previewed. Similarly, the addition result in the output adder circuit Al115 is passed through a switch a18' and applied to the signal line 10 so that it can be oscillated.

When six modes are specified in the mixing device of FIG. 2 as shown in the "Effect mode" column of FIG. 3, the input line A and Each series A corresponding to B, C and DlE and F
The B column, CD column, and EF column are selectively operated. For example, the first
(When the effect mode is specified, the AB and CD sequences are not used, and the EF sequence is used.) Operates without using IJ. On the other hand, when the fourth effect mode is designated, for example, the CD series operates without being given the re-entry signal, and the AB series is re-entered so that the second re-entry effect EFF2 is applied from the re-entry control circuit RE. When the entry signal is given, the EF sequence receives the first reen)
An entry signal is given so that the IJ effect EFF1 is attached. In order to realize such an operation, the control signal line C0 is
A corresponding control signal is given to NTli~CON T13, and 8t! Figure 3 [Re-entry number G]
IJ control circuit R
Eight signals calculated at E will be sent out.

In order to switch off the EP system when the first effect mode is specified, the effect control signal line coNTj, :4
An effect control signal KBF is applied to the effect control signal lines C0NTII and C0NT12, and a non-operation signal is applied to the other effect control signal lines C0NTII and C0NT12. At the same time, the reentry control circuit RE connects to the input line 6 of the effect control signal KBF via the ζ switch all! A control signal of 9 "1" level is applied to maintain the trunk signal GCa at a logic "1" level. This number 4J is inverted in the inverter 3 and re-enabled through the switches a2 and a6)IJ(i
The signals Gel and GC2 are applied to multiplier circuits AMI and AM2. As a result, the mixing circuit M k 13 performs a mixing operation according to the effect signal F according to the added effect mode, and its output 813 is 51! : Tool circuit AM
Output additive 1 circuit A D 1 after being multiplied by 1 in 3
Sent on 5th. On the other hand, multiplier circuits All and AM
Reason 3 for 2! f! rOJ reentry signals GCI and G
Since C2 is given, only video 4=+f is not sent from the AB series and the CD series to the output addition circuit AD15. Thus, from the output adder circuit A D 15, 15! of the EF series! :The image signal will be sent out as is.

For example, when the fourth effect mode is specified, based on the effect control signal i<AB of the effect control signal line CON''f11, the multiplier circuit M1 connected to the human power line AK is
Give control number 4B of l1 + buried "0", and input line B
Logic “1” control (
, If is given. Also, the effect control signal K on the effect control signal line C0NT12. Based on the DK, the human power line C and the multiplier circuits IV11 and M2 connected to the DK are given values that change depending on the mode (g), which gives them a value (g 812) with a specified visual effect. is sent from the mixing circuit MK 12.Furthermore, based on the effect control signal of the effect control signal line eONT13, a multiplier circuit M1 connected to the input line E based on FK
A state is reached in which a control signal 1g of ``0'' is applied to the control signal 1g, and a control signal of logic ``1'' is applied to the multiplier circuit M2 connected to the human power line FK. In this state, the mixing circuit MKII passes through the multiplier circuit IVI 2 Y to the input line B'& output signal S11.
The mixing circuit M
The input image IJf1 on the input line F is sent out as an output signal 813 via the multiplication circuit M2 of K13.

Also, in this effect mode, the beam entry control circuit RE
The effect signal @KAB is applied to the multiplier circuit ① through the switch a8, and is also applied to the control 141 signal through the switch alO to the input line 6. Then, the multiplication circuit 10 multiplier output (K, xl(AB)) is sent out as the reentry signal GCI through the switch a3.

In addition, the output of the inverter 5 (KIIiF +) is sent to 5 as the reentry signal GC2 through the switch a5.
4! It is applied to the arithmetic circuit AM2. Further, a re-entry signal GC3 is applied to the effect control signal (ii), and thus the operation state is set according to the designated mode.

In this way, in the fourth effect mode, the effect control signal K
Mixing circuit 1vlKll, MK12, ViK1 controlled by AB e KOD + KBp
3 output 811°S12. S13 is obtained, and this output signal S11°S12. Sl: (re-enters the re-entry signals GC1, GC2° GC3 in the re-entrant multiplier circuits AM1...AM2° AM3, and then adds and synthesizes them in the output adder circuit ADI5. At this time, the multiplier circuit AMI.

AM2. The coefficient of the video signal given from AM3 to the output adder circuit A15 is returned to c1 so that the coefficient of the mixing output signal BGM obtained as a result of addition and synthesis becomes 1. .

In such an operating state, each mixing circuit 1VIK11
〜MKJ3 output t switches a15 to a, 17 can be used to transmit the output as a blur signal PvW, and the combined addition result data in the output adder circuit A I) 15 can also be output as a blur signal P via switch a18.
It can be previewed as a VW.

〔Effect of the invention〕

As described above, according to the present invention, a reentry multiplier circuit is provided on the output side of each mixing circuit, and the effect control 1g applied to the mixing circuit is applied to each reentry multiplication circuit.
By performing the ``c operation based on the ``c'' function and providing an entry signal, the same multiplication operation 14'i is required for each superimposition to obtain a video signal similar to that obtained by repeatedly multiplying the video signal 11 times as shown in Fig. 1. By eliminating the need for execution and only adding in the output adder circuit, the enlargement of errors in the puncturing image and the phase delay due to entry, as occurred in Figure A1, are not caused. This can be prevented.

[Brief explanation of the drawing]

Figure 1 shows block MKII, which shows a conventional mixing device.
~MK13...Mixing circuit, A1) 11~AD1
3...addition circuit, AIVII~AM3...reen)
IJ multiplication circuit, AD15...output addition circuit, RE
... Reentry control (b) path, Ml, M2... Multiplication circuit, INI... Inverter, a]~all... Switch. Applicant's agent 1) Akira Beshi

Claims (1)

[Claims] A plurality of mixing circuits that mix a plurality of video signals in units of two video signals, each using a first effect control signal, and a plurality of mixing circuits that receive the outputs of the corresponding mixing circuits and multiply them by a second effect control signal. A mixing device comprising: a multiplier circuit; and an output adder circuit that adds the outputs of the plurality of multiplier circuits to obtain a mixing output signal.