CN2814833Y - TV set with analog on-off circuit - Google Patents
TV set with analog on-off circuit Download PDFInfo
- Publication number
- CN2814833Y CN2814833Y CN 200520086773 CN200520086773U CN2814833Y CN 2814833 Y CN2814833 Y CN 2814833Y CN 200520086773 CN200520086773 CN 200520086773 CN 200520086773 U CN200520086773 U CN 200520086773U CN 2814833 Y CN2814833 Y CN 2814833Y
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- analog switch
- switch chip
- resistance
- audio signal
- input
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Abstract
The utility model discloses a TV with an analog on-off circuit, which comprises an analog switch chip, audio signals is connected to an input end of the analog switch chip through a coupling capacitor, a gating end is used for receiving command signals sent by a controller and the output of the audio signals of the corresponding input end can be controlled. The input end of the analog switch chip is connected with a voltage clamping circuit which is formed by that two resistors are connected in series, on end of the resistors connected in series is connected with a direct current power supply, the other end is grounded, the junction point of the two resistors is connected with the input end of the analog switch, proper DC restoration can be provided for the audio signals, only positive level can reach the signals of the analog switch chip, no negative level exists, thereby, the crosstalk problem of the audio channels can be avoided. The utility model ensures that the audio signals can be output normally, and the product reliability and the comfortability can be improved.
Description
Technical field
The utility model relates to a kind of improvement of TV set circuit, specifically, relates to a kind of improvement to analog switching circuit in the television set.
Background technology
At present; in audiovisual series products such as existing television set; often can use the switching that analog switching circuit carries out audio signal path; accompanying drawing 1 has just been enumerated a kind of analog switching circuit commonly used; the main chip 74LV4052D that adopts realizes; multichannel left and right acoustic channels audio signal is connected the different inputs of described analog switch chip 74LV4052D respectively with electrochemical capacitor through divider resistance separately, the high-low level state that described analog switch chip 74LV4052D receives according to its gating termination is with the audio signal output of its respective input.Because in television set, between the supply voltage value, and audio signal becomes the AC signal that does not contain flip-flop after through the electrochemical capacitor coupling to generally single power supply just, so the allowed band of input signal at 0V, and timing is negative during level.When audio signal level when negative, the work of analog switch can occur unusually, the generation crosstalk phenomenon shows as when gating passage 1, the audio signal of passage 2 can be gone here and there in the passage 1, thereby has influenced the normal output of audio signal.
Summary of the invention
Crosstalk phenomenon appearred in regular meeting when the utility model carried out the voice-grade channel switching in order to solve the available technology adopting analog switch; influence the problem of the normal output of audio signal; a kind of novel analog switch application circuit is provided; on the basis of existing analog switching circuit, improve by simple; solve the cross-interference issue of voice-grade channel, realized the normal stable output of audio signal.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of analog switching circuit and television set with described analog switching circuit, comprise the analog switch chip, audio signal connects the input of described analog switch chip through coupling capacitance, and the command signal that its gating termination admission controller sends is controlled the audio signal output of its respective input; Wherein, the input at described analog switch chip is connected with voltage clamp circuit.
As the further qualification to technique scheme, described voltage clamp circuit is in series by two resistance, and an end of described series resistance connects DC power supply, other end ground connection, and the tie point of two resistance links to each other with the input of described analog switch chip.
As the further qualification again to technique scheme, audio signal connects described coupling capacitance through a resistance, and the tie point of described resistance and coupling capacitance is through another grounding through resistance.The model of described analog switch chip is 74LV4052D.
Compared with prior art, advantage of the present utility model with good effect is: the utility model is connected voltage clamp circuit by the audio signal input end at the analog switch chip, for providing suitable direct current, audio signal recovers, make the signal that reaches the analog switch chip have only positive level, there is not negative level, thereby avoided the appearance of voice-grade channel cross-interference issue, guaranteed the normal output of audio signal, improve reliability of products and comfortableness, had wide application and higher utility.
Description of drawings
Fig. 1 is the connection line figure of analog switch application circuit in the prior art;
Fig. 2 is the improved analog switching circuit structure chart of the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.
Be the simplification circuit structure, the annexation of one tunnel audio signal of only having drawn among Fig. 2, other each road audio signal has identical annexation.Among Fig. 2, audio signal connects the input X0 of simulation switch chip N5 through resistance R 1, coupling capacitance C1, on its input X0, be connected with the voltage clamp circuit of forming by resistance R A1 and RA2, described resistance R A1 is connected+the 8V DC power supply with RA2 series connection back one end, other end ground connection, the tie point of two resistance R A1, RA2 links to each other with the input X0 of described analog switch chip N5, and input X0 is carried out voltage clamp, recovers for audio signal provides suitable direct current.Clamping level is realized that by two resistance R A1, RA2 dividing potential drop its level height is decided according to the amplitude peak of input audio signal, and the signal that arrives analog switch chip N5 does not so just have negative level, has avoided the appearance of crosstalk phenomenon.
Gating end A, the B of described analog switch chip N5 connects the controller of television set inside, select the audio signal of respective input according to the high-low level state that receives, export to follow-up audio frequency processing circuit by its output X, Y, the control audio signal is effectively exported.
Circuit structure of the present utility model is simple and reliable, efficiently solves the cross-interference issue of voice-grade channel, has improved reliability of products and comfortableness.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 (8)
1. an analog switching circuit comprises the analog switch chip, and audio signal connects the input of described analog switch chip through coupling capacitance, and the command signal that its gating termination admission controller sends is controlled the audio signal output of its respective input; It is characterized in that: the input at described analog switch chip is connected with voltage clamp circuit.
2. analog switching circuit according to claim 1, it is characterized in that: described voltage clamp circuit is in series by two resistance, one end of described series resistance connects DC power supply, other end ground connection, and the tie point of two resistance links to each other with the input of described analog switch chip.
3. analog switching circuit according to claim 1 and 2 is characterized in that: audio signal connects described coupling capacitance through a resistance, and the tie point of described resistance and coupling capacitance is through another grounding through resistance.
4. analog switching circuit according to claim 1 and 2 is characterized in that: the model of described analog switch chip is 74LV4052D.
5. television set with described analog switching circuit, comprise the analog switch chip, audio signal connects the input of described analog switch chip through coupling capacitance, and the command signal that its gating termination admission controller sends is controlled the audio signal output of its respective input; It is characterized in that: the input at described analog switch chip is connected with voltage clamp circuit.
6. the television set with analog switching circuit according to claim 5, it is characterized in that: described voltage clamp circuit is in series by two resistance, one end of described series resistance connects DC power supply, other end ground connection, the tie point of two resistance links to each other with the input of described analog switch chip.
7. according to claim 5 or 6 described television sets with analog switching circuit, it is characterized in that: audio signal connects described coupling capacitance through a resistance, and the tie point of described resistance and coupling capacitance is through another grounding through resistance.
8. according to claim 5 or 6 described television sets with analog switching circuit, it is characterized in that: the model of described analog switch chip is 74LV4052D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520086773 CN2814833Y (en) | 2005-09-02 | 2005-09-02 | TV set with analog on-off circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520086773 CN2814833Y (en) | 2005-09-02 | 2005-09-02 | TV set with analog on-off circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2814833Y true CN2814833Y (en) | 2006-09-06 |
Family
ID=36949919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520086773 Expired - Fee Related CN2814833Y (en) | 2005-09-02 | 2005-09-02 | TV set with analog on-off circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2814833Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104469180A (en) * | 2014-11-04 | 2015-03-25 | 深圳市创维群欣安防科技有限公司 | Audio and video signal switching crosstalk preventing device based on analog multiplexer |
-
2005
- 2005-09-02 CN CN 200520086773 patent/CN2814833Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104469180A (en) * | 2014-11-04 | 2015-03-25 | 深圳市创维群欣安防科技有限公司 | Audio and video signal switching crosstalk preventing device based on analog multiplexer |
| CN104469180B (en) * | 2014-11-04 | 2017-12-19 | 深圳市创维群欣安防科技股份有限公司 | A kind of audio-video signal switching anti-crosstalk device based on analog multiplexer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |