CN2836372Y

CN2836372Y - TV set with multi-channel video signal switching circuit

Info

Publication number: CN2836372Y
Application number: CNU2005201247328U
Authority: CN
Inventors: 谢红军; 林勇鹏; 杨勇
Original assignee: Hisense Group Co Ltd; Qingdao Hisense Electronics Co Ltd
Current assignee: Hisense Group Co Ltd; Qingdao Hisense Electronics Co Ltd
Priority date: 2005-11-15
Filing date: 2005-11-15
Publication date: 2006-11-08
Anticipated expiration: 2015-11-15

Abstract

The utility model discloses a television set with a multi-channel video signal switching circuit, which comprises an input end of multiple channels of signals and a main control chip, wherein an input signal commutation circuit is additionally arranged between the input end of multiple channels of signals and the main control chip, and the input signal switching circuit can be achieved by adopting a switching chip. An input end of the switching chip can simultaneously receive input of multiple channels of video signals, and an input signal selecting end is connected with a GPIO port of the main control chip to enable a controllable end to be in earth contact. Under the control action of the main control chip and by different high-low level combinations of the GPIO port, multi-channel input and the video switching function by one channel output can be achieved; thus, the problem of less functions of the television set caused by a deficient main control chip input port can be solved by a simple circuit structure and low cost. The utility model has important practical application significance on the aspect of consume electronics.

Description

Television set with multi-channel video signal commutation circuit

Technical field

The utility model relates to a kind of improvement of TV set circuit, specifically, relates to realize in a kind of TV set circuit the commutation circuit of multi-channel video signal selection input.

Background technology

Along with extensively popularizing of digitlization household electrical appliances, the function that household electrical appliance are finished from strength to strength.Sometimes in order to satisfy the needs of existing market, television set need receive multi-channel A V input and the input of multichannel S video, also important simultaneously input and VGA input.And the input interface of television set main control chip is limited, can not receive the vision signal of multichannel input simultaneously, in order to solve the problem of these many input interfaces, needs the special switching chip of configuration to realize the selection input of input signal.

Summary of the invention

The utility model need be imported multi-channel video signal in order to solve in the prior art television set, and the input interface of main control chip problem in short supply, a kind of novel TV machine multi-channel video signal commutation circuit is provided, realize the selection input of multi-channel video signal by simple circuit configuration, effectively expanded the function of use of television set.

For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:

A kind of television set with multi-channel video signal commutation circuit, comprise multiple signals input and main control chip, between described multiple signals input and main control chip, have additional an input signal commutation circuit, the input port of described input signal commutation circuit connects described multiple signals input, input signal selects port to link to each other with the IO mouth of main control chip, and output port connects follow-up video processing circuit.

As further qualification to technique scheme, the input port of described input signal commutation circuit is a pair of 4 passage video signal input terminal mouths, include two input signals and select port, link to each other with two GPIO mouths of main control chip respectively, according to the high-low level state that main control chip sends, determine one of them the channel selecting output in the described 4 passage video signal input terminal mouths.

As further limiting again to technique scheme, described input signal commutation circuit includes two and enables control port, link to each other with two GPIO mouths of main control chip respectively, according to the high-low level state that main control chip sends, determine the wherein group selection output in described two group of 4 passage video signal input terminal mouth; In the utility model, two enable the equal ground connection of control port.Described input signal commutation circuit includes two VT mouths, links to each other with the video signal input terminal of digital to analog converter in the subsequent video signal processing circuit respectively.

As the further qualification again to technique scheme, it is the diverter switch chip realization of PI5V331W that described input signal commutation circuit adopts a model, and the model of digital to analog converter is MST9883.

As further qualification to technique scheme, in described multi-channel video signal commutation circuit, include three diverter switch chips, the input of preceding two diverter switch chips receives the vision signal of sending from VGA terminal, PCM terminal and S terminal respectively, and output is connected R, G, the B signal input part of described digital to analog converter respectively with coupling capacitance through the resistance of series connection; The input of the 3rd diverter switch chip receives line synchronizing signal and the field sync signal from the VGA terminal respectively, and its output connects row, the field sync signal input of described digital to analog converter respectively on the one hand through resistance, on the other hand through filter capacitor ground connection.

Compared with prior art, advantage of the present utility model and good effect are: the utility model is by setting up the input signal commutation circuit between the multiple signals input of television set and main control chip, make television set can connect the multi-channel video signal input simultaneously, and under the control action of main control chip GPIO mouth, by different GPIO mouth high-low level combinations, realized the multichannel input, the video switch function of one tunnel output, thereby solved owing to the not enough less problem of function that causes of main control chip input port with simple circuit configuration and lower cost, aspect consumer electronics, had important practical application meaning.

Description of drawings

Fig. 1 is the internal circuit schematic diagram of diverter switch chip in the utility model;

Fig. 2 is the concrete circuit connection diagram between diverter switch chip and the signal input terminal in the utility model;

Fig. 3 is the concrete circuit connection diagram between diverter switch chip and the digital to analog converter in the utility model.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.

The utility model employing model is the selection output function that the diverter switch chip of PI5V331W is finished the multichannel input signal, and its inner schematic diagram is referring to shown in Figure 1.Described diverter switch chip PI5V331W includes two group of 4 passage video signal input terminal mouth S1A, S2A, S3A, S4A and S1B, S2B, S3B, S4B; 2 VT mouth DA, DB; 2 input signals select port IN1, IN0:2 to enable control port ENA, ENB and 1 power input mouth VCC and 1 grounding pin GND.As 2 input signals selection port IN1, when the residing level state of IN0 is 00,01,10,11, this has represented 4 different state of a controls, represent wherein one group of signal in 4 groups of signal input ports by gating (as S1A and S1B), among output port DA, the DB in these 4 groups of signals of output by one group of signal (as S1A and S1B) of gating.Simultaneously, enable the residing high-low level state of control port ENA, ENB according to 2, decision is output A group signal or group-b signal.When enabling control port ENA when being low level, output A group signal (as S1A); When enabling control port ENB when being low level, output group-b signal (as S1B).Thus, the input signal of described diverter switch chip PI5V331W is selected port IN1, IN0 and enabled control port ENA, ENB and link to each other with different GPIO mouth in the main control chip respectively, under the control action of main control chip, by exporting different high-low level signals, realize selection output to multi-channel video signal.Wherein, the concrete line connecting relation between the digital to analog converter in described diverter switch chip PI5V331W and main control chip and the video processing circuit is referring to Fig. 2 and shown in Figure 3.

In Fig. 2, Fig. 3, adopt 3 PI5V331W diverter switch chip U3, U4, U50 to receive the vision signal of unlike signal source output.Wherein, S3A input, the S3B input of the S3A input of diverter switch chip U4 and diverter switch chip U3 receive respectively from the R of VGA terminal, G, B signal VGA_R, VGA_G, VGA_B; The S2A input of the S2A input of diverter switch chip U4 and diverter switch chip U3, S2B input receive respectively from the Pr of PCM terminal, Y, Pb signal VGA_Pr, VGA_Y, VGA_Pb; The S1A input of the S1A input of diverter switch chip U4 and diverter switch chip U3, S1B input receive respectively from the Pr1 of S terminal, Y1, Pb1 signal; The S3A input of diverter switch chip U50 and S3B input then receive row, field sync signal VGA_HSYNC, the VGA_VSYNC from the VGA terminal respectively.And input signal selecting side IN0, the IN1 of described diverter switch chip U3, U4, U50 receive high-low level control signal HDTV_ESL0, HDTV_SEL1 that the GPIO mouth from main control chip sends respectively, enable the equal ground connection of control end ENA, ENB, the high-low level state that sends according to main control chip, the corresponding one group of input signal of gating is exported through its two-way output DA, DB.From the SCALAR circuit+5V DC power supply 5V_SCALAR provides working power through the filter capacitor C7 of parallel connection and C8, C9 and C10, C800 and C801 for diverter switch chip U3, U4, U50 respectively.Its output DA, DB are input to R, G, B signal input part RAIN, GAIN, the BAIN (with respect to diverter switch chip U3, U4) of the digital to analog converter U5 in the video processing circuits with the outputting video signal selected through divider resistance R32, R33 or R34 and coupling capacitance C37, C38 or C39.And the line synchronizing signal of output DA, the DB of diverter switch chip U50 output or field sync signal connect row, field sync signal input HSYNC, the VSYNC of described digital to analog converter U5 on the one hand through resistance R 30 or R31, on the other hand through filter capacitor C35 or C36 ground connection.It is that the conversion chip of MST9883 is realized that described digital to analog converter U5 adopts model, the vision signal that receives is carried out digital-to-analogue conversion after, export to follow-up video processing circuits and handle output.

The utility model has been realized the multichannel input of multi-channel video signal and the video switch function of one tunnel output by adopting above-mentioned simple circuit configuration, solved owing to the not enough less problem of function that causes of main control chip input port, can be widely used in having wide application and actual application value in the TV set circuit of various models.Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.

Claims

1. television set with multi-channel video signal commutation circuit, comprise multiple signals input and main control chip, it is characterized in that: between described multiple signals input and main control chip, have additional an input signal commutation circuit, the input port of described input signal commutation circuit connects described multiple signals input, input signal selects port to link to each other with the IO mouth of main control chip, and output port connects follow-up video processing circuit.

2. the television set with multi-channel video signal commutation circuit according to claim 1, it is characterized in that: the input port of described input signal commutation circuit is a pair of 4 passage video signal input terminal mouths, include two input signals and select port, link to each other with two GPIO mouths of main control chip respectively, according to the high-low level state that main control chip sends, determine one of them the channel selecting output in the described 4 passage video signal input terminal mouths.

3. the television set with multi-channel video signal commutation circuit according to claim 2, it is characterized in that: described input signal commutation circuit includes two and enables control port, link to each other with two GPIO mouths of main control chip respectively, according to the high-low level state that main control chip sends, determine the wherein group selection output in described two group of 4 passage video signal input terminal mouth.

4. the television set with multi-channel video signal commutation circuit according to claim 2 is characterized in that: described input signal commutation circuit includes two and enables control port, and two enable the equal ground connection of control port.

5. the television set with multi-channel video signal commutation circuit according to claim 4, it is characterized in that: described input signal commutation circuit includes two VT mouths, links to each other with the video signal input terminal of digital to analog converter in the subsequent video signal processing circuit respectively.

6. the television set with multi-channel video signal commutation circuit according to claim 5 is characterized in that: it is the diverter switch chip realization of PI5V331W that described input signal commutation circuit adopts a model.

7. the television set with multi-channel video signal commutation circuit according to claim 6 is characterized in that: it is the integrated chip realization of MST9883 that described digital to analog converter adopts a model.

8. the television set with multi-channel video signal commutation circuit according to claim 7, it is characterized in that: in described multi-channel video signal commutation circuit, include three diverter switch chips, the input of preceding two diverter switch chips receives the vision signal of sending from VGA terminal, PCM terminal and S terminal respectively, and output connects R, G, the B signal input part of described digital to analog converter respectively; The input of the 3rd diverter switch chip receives line synchronizing signal and the field sync signal from the VGA terminal respectively, and its output connects row, the field sync signal input of described digital to analog converter respectively.

9. the television set with multi-channel video signal commutation circuit according to claim 8 is characterized in that: the output of described preceding two diverter switch chips is connected R, G, the B signal input part of described digital to analog converter with coupling capacitance through the resistance of series connection.

10. according to Claim 8 or 9 described television sets with multi-channel video signal commutation circuit, it is characterized in that: the output of described the 3rd diverter switch chip connects row, the field sync signal input of described digital to analog converter on the one hand through resistance, on the other hand through filter capacitor ground connection.