CN202309672U

CN202309672U - One-out-multi channel selection circuit

Info

Publication number: CN202309672U
Application number: CN201120397244XU
Authority: CN
Inventors: 赵邙; 彭小华
Original assignee: Konka Group Co Ltd
Current assignee: Konka Group Co Ltd
Priority date: 2011-10-18
Filing date: 2011-10-18
Publication date: 2012-07-04
Anticipated expiration: 2021-10-18

Abstract

The utility model discloses a one-out-multi channel selection circuit which is used for realizing that when a certain input signal is gated, other input signals which are not gated do not disturb the normal output of the gated input signal. The technical scheme adopted by the utility model is as follows: the one-out-multi channel selection circuit disclosed by the utility model comprises a signal input end, a signal output end and a logic switching circuit connected with the signal input end; and when the certain input signal is gated through the circuit, other input signals which are not gated are subjected to grounded short circuit through a capacitor. In the circuit disclosed by the utility model, a mode of grounding the signals which are not gated is adopted, thus the signals which are not gated are prevented from disturbing the gated signal, so that the quality of pictures output by a display device is improved. The circuit disclosed by the utility model is simple in structure and convenient in use.

Description

Multiselect one channel selection circuit

Technical field

The utility model relates to a kind of signal selecting circuit, particularly a kind of can anti-radio frequency, multiclass input signal such as audio frequency and video does the signalling channel selection circuit that (string) disturbs mutually.

Background technology

Usually; General display device has two-way or multiple signals input channel, accepts the signal of different signal sources output respectively, in the prior art; Alternative or the multiselect one passage switching IC switches of using carry out the channel selecting switching more; Particularly in the radio-frequency channel or audio frequency and video passage when switching, owing to all include frequency higher signal composition in the input signal, general commutation circuit is difficult to doing the high-frequency signal component separating that (string) disturb in the two paths of signals mutually clean.When certain input signal during by gating, be in open-circuit condition not by the high-frequency signal composition in the signal of gating, always do (string) and disturb, thereby influence the output picture of display device being produced by the signal of gating.

Summary of the invention

The purpose of the utility model provides a kind of multiselect one channel selection circuit, and the technical problem that solve is that other can not disturbed by the normal output of the input signal of gating by the input signal of gating when a certain input signal during by gating.

The technical scheme that the utility model adopted is:

Multiselect one channel selection circuit of the utility model; Comprise signal input part, output and the logic switching circuit that is connected with signal input part; When a certain input signal passed through this circuit by gating, other was passed through a capacity earth short circuit by the input signal of gating.

Described signal input part is two.

Described signal input part is three.

The utility model has been owing to adopted not by the mode of gating signal ground connection, thereby avoids not by gating signal having been improved the quality of display device output picture by the interference of gating signal, and the utility model is simple in structure, easy to use.

Description of drawings

Fig. 1 is the circuit diagram of the utility model embodiment 1.

Fig. 2 is the circuit diagram of the utility model embodiment 2.

Embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is done further explain.

Embodiment 1

Shown in accompanying drawing 1; Multiselect one channel selection circuit of the utility model; Comprise two signal input part input1 and input2; Input1 end is through the pin1 of first resistance R 1, first capacitor C, 1 admission passage gating IC, and the pin1B of gating IC joins through the output output of second capacitor C 2 with IC, and the pin1A of gating IC joins through the 3rd capacitor C 3 and ground; Input2 end is through the pin2 of second resistance R 2, the 4th capacitor C 4 admission passage gating IC, and the pin2B of gating IC joins through the output output of the 5th capacitor C 5 with IC, and the pin2A of gating IC joins through the 6th capacitor C 6 and ground.

Logic switching circuit switching signal SW1 control input signals input1 of the prior art, SW2 control input signals input2 is under the control of said logic switching circuit switching signal SW1 and SW2, by the output output output of the input signal of gating by IC.

Operation principle is following:

When described switching signal SW2 was high level H: input signal input2 was coupled into the pin2 of IC and is set through second resistance R, 2, the four capacitor C 4 and is connected to pin2B, was exported through the 5th capacitor C 5 by pin2B; Meanwhile; Described switching signal SW1 is low level L; Input signal input1 is coupled into the pin1 of IC and is set and be connected to pin1A through first resistance R 1, first capacitor C 1, because of pin1A through the 3rd capacitor C 3 ground connection, so input signal input1 shorted to earth.

In like manner, when described switching signal SW2 be low level L, when SW1 is high level H: input signal input2 shorted to earth; Input signal input1 is exported through second capacitor C 2 by pin1B.

Realize thus; After certain road input signal admission passage gating IC is by gating; Other is not by the control of the input signal of gating through switching signal corresponding in the described logic switching circuit; With not being connected with the ground capacity of setting by the input signal of gating; So just will be not by the input signal shorted to earth of gating through electric capacity, greatly reduce not by of the interference of the input signal of gating normally having been exported by the input signal of gating.

Embodiment 1 alternative channel selection circuit logical relation such as following table:

?SW1	SW2	By the gating input signal
			H	L	input1
L	H	input2

Embodiment 2

As shown in Figure 2; Multiselect one channel selection circuit of the utility model; Comprise three signal input part input3, input4 and input5; Input3 end is through the pin3 of the 3rd resistance R 3, the 7th capacitor C 7 admission passage gating IC, and the pin3B of gating IC joins through the output output of the 9th capacitor C 9 with IC, and the pin3A of gating IC joins through the 8th capacitor C 8 and ground; Input4 end is through the pin4 of the 4th resistance R 4, the tenth capacitor C 10 admission passage gating IC, and the pin4B of gating IC joins through the output output of the 12 capacitor C 12 with IC, and the pin4A of gating IC joins through the 11 capacitor C 11 and ground; The input5 end is through the pin5 of the 5th resistance R the 5, the 13 capacitor C 13 admission passage gating IC, and the pin5B of gating IC joins through the output output of the 15 capacitor C 15 with IC, and the pin5A of gating IC joins through the 14 capacitor C 14 and ground.

Logic switching circuit switching signal SW3 control input signals input3 of the prior art; SW4 control input signals input4; SW5 control input signals input5; Under the control of logic switching circuit switching signal SW3, SW4 and SW5, by of the output output output of the input signal of gating by IC.

Operation principle is following:

When described switching signal SW4 was high level H: input signal input4 was coupled into the pin4 of IC and is set and be connected to pin4B through the 4th resistance R 4, the tenth capacitor C 10, by pin4B through 12 outputs of the 12 capacitor C; Meanwhile; Described switching signal SW3 and SW5 are low level L; Input signal input3 is coupled into the pin3 of IC and is set and be connected to pin3A through the 3rd resistance R 3, the 7th capacitor C 7, because of pin3A through the 8th capacitor C 8 ground connection, so input signal input1 shorted to earth.And input signal input5 is coupled into the pin5 of IC and is set through the 5th resistance R the 5, the 13 capacitor C 13 and is connected to pin5A, because of pin5A through the 14 capacitor C 4 ground connection, so input signal input5 short circuit equally over the ground.

In like manner, when described switching signal SW3 be high level H, SW4 and SW5 when being low level: input signal input4 and input5 shorted to earth; Input signal input3 is exported through the 9th capacitor C 9 by pin3B; When described switching signal SW5 is high level H, SW3 and SW4 when being low level: input signal input3 and input4 shorted to earth; Input signal input5 is exported through the 15 capacitor C 15 by pin5B.

Embodiment 2 three selects a channel selection circuit logical relation such as a following table:

Claims

1. multiselect one channel selection circuit; Comprise signal input part, output and the logic switching circuit that is connected with signal input part; It is characterized in that: when a certain input signal passed through this circuit by gating, other was passed through a capacity earth short circuit by the input signal of gating.

2. multiselect one channel selection circuit according to claim 1 is characterized in that: described signal input part is two.

3. multiselect one channel selection circuit according to claim 1 is characterized in that: described signal input part is three.