CN101425005A - Audio circuit for motherboard - Google Patents
Audio circuit for motherboard Download PDFInfo
- Publication number
- CN101425005A CN101425005A CNA2007102023224A CN200710202322A CN101425005A CN 101425005 A CN101425005 A CN 101425005A CN A2007102023224 A CNA2007102023224 A CN A2007102023224A CN 200710202322 A CN200710202322 A CN 200710202322A CN 101425005 A CN101425005 A CN 101425005A
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- CN
- China
- Prior art keywords
- pin
- decoder chip
- voice
- header board
- earphone
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The invention relates to a voice-frequency circuit of a motherboard, which comprises a voice-frequency coding decoder chip and a front panel small card connector, wherein the voice-frequency coding decoder chip comprises a detection pin, the front panel small card connector comprises a detection signal pin, a microphone pin and an earphone pin, wherein the detection signal pin of the front panel small card connector is grounded, the microphone pin is connected with the detection pin of the voice-frequency coding decoder chip through a first resistor, and the earphone pin is connected with the detection pin of the voice-frequency coding decoder chip through a second resistor. The voice-frequency circuit of the motherboard causes the detection signal pin of the front panel small card connector to be grounded, the microphone pin and the earphone pin are respectively connected with the detection signal pin of the voice-frequency coding decoder chip through a resistor, thereby the voice-frequency circuit can not influence the automatic detection function of the voice-frequency coding decoder chip, and can effectively remove crosstalk signals generated by a front panel small card, and avoids the crosstalk signals influencing the detection result of the voice-frequency coding decoder chip.
Description
Technical field
The present invention relates to a kind of audio circuit for motherboard.
Background technology
On the existing pc board, except central processing unit and south/north bridge control chip group is arranged, also be provided with the audio coder-decoder chip usually, so that the sound signal of motherboard I/O is handled.
Existing audio coder-decoder chip (for example ALC662 type CODEC chip), usually by little card connector of header board (ONBOARD FRONT PANEL HEADER) and the little card connection of a header board, then be provided with microphone interface and earphone interface on the header board lesser calorie, after microphone or earphone being connected on the corresponding interface of header board lesser calorie, the sound signal that computing machine produces can be exported by earphone, and extraneous sound signal also can be imported computing machine by microphone.
With reference to figure 1, existing audio circuit for motherboard generally includes an audio coder-decoder chip 12 and a header board lesser calorie connector 14, described audio coder-decoder chip 12 comprises a detective pin S, described header board lesser calorie connector 14 comprises a detectable signal pin 7, a microphone pin 6 and an earphone pin 10, the detectable signal pin 7 of described header board lesser calorie connector 14 is connected with the detective pin S of described audio coder-decoder chip 12, and microphone pin 6 and earphone pin 10 are respectively by a resistance eutral grounding.One header board lesser calorie (figure does not show) is installed on the described header board lesser calorie connector 14, described header board lesser calorie is provided with microphone interface and earphone interface, described header board lesser calorie makes the detective pin 7 and microphone pin 6 conductings of described header board lesser calorie connector 14 when connecting a microphone on microphone interface, and when connecting an earphone on the earphone interface, make the detective pin 7 and 10 conductings of earphone pin of described header board lesser calorie connector 14, because the resistance value of two resistance that connect with described microphone pin 6 and earphone pin 10 is different, so the current value that the detective pin S of described audio coder-decoder chip 12 obtains under two kinds of conducting situations is also inequality, whereby, described audio coder-decoder chip 12 can be microphone or earphone according to what connect on the judgement of the size of current on the detective pin S header board lesser calorie, thereby the duty of determining audio coder-decoder chip 12 is audio frequency input or audio frequency output.
But, after the header board lesser calorie is installed on the little card connector of header board, the header board lesser calorie can produce crosstalk signal on audio circuit for motherboard, because microphone pin 6 and earphone pin 10 pass through resistance eutral grounding respectively, and detectable signal pin 7 directly is connected with the detective pin S of described audio coder-decoder chip 12, therefore crosstalk signal can be transferred to described audio coder-decoder chip 12 by low impedance path, generally when header board lesser calorie quality conforms with the audio frequency code requirement, described crosstalk signal is little to the influence of described audio coder-decoder chip 12, and when header board lesser calorie inferior quality, the crosstalk signal of its generation will influence the size of current on the described audio coder-decoder chip 12 detective pin S, thereby cause described audio coder-decoder chip 12 can't differentiate the connection status of described header board lesser calorie.
Summary of the invention
In view of above content, be necessary to provide a kind of audio circuit for motherboard, can remove the influence of the crosstalk signal encode audio decoder chip of header board lesser calorie generation.
A kind of audio circuit for motherboard, comprise an audio coder-decoder chip and the little card connector of a header board, described audio coder-decoder chip comprises a detective pin, the little card connector of described header board comprises a detectable signal pin, a microphone pin and an earphone pin, the detectable signal pin ground connection of the little card connector of described header board, microphone pin is connected with the detective pin of described audio coder-decoder chip by one first resistance, and the earphone pin is connected with the detective pin of described audio coder-decoder chip by one second resistance.
Above-mentioned audio circuit for motherboard makes the detectable signal pin ground connection of the little card connector of header board, microphone pin and earphone pin are connected with the detective pin of audio coder-decoder chip by a resistance respectively, promptly do not influence the automatic detecting function of audio coder-decoder chip, also can effectively remove the crosstalk signal that the header board lesser calorie produces, avoid crosstalk signal to influence the result of detection of audio coder-decoder chip.
Description of drawings
Below in conjunction with accompanying drawing and better embodiment the present invention is described in further detail:
Fig. 1 is the circuit diagram of existing audio circuit for motherboard.
Fig. 2 is the circuit diagram of audio circuit for motherboard better embodiment of the present invention.
Embodiment
With reference to figure 2, the better embodiment of audio circuit for motherboard of the present invention comprises an audio coder-decoder chip 22 and a header board lesser calorie connector 24, described audio coder-decoder chip 22 comprises a detective pin S, described header board lesser calorie connector 24 is the little card connector of a 10PIN header board, it comprises a detectable signal pin 7, one microphone pin 6 and an earphone pin 10, detectable signal pin 7 ground connection of described header board lesser calorie connector 14, microphone pin 6 is connected with the detective pin S of described audio coder-decoder chip 22 by one first resistance R 1, and earphone pin 10 is connected with the detective pin S of described audio coder-decoder chip 22 by one second resistance R 2.
In this better embodiment, described audio coder-decoder chip 22 is an ALC662 type CODEC chip, and therefore, according to design specifications, the resistance value of described first resistance R 1 is 20KOhm, and the resistance value of described second resistance is 39.2KOhm.
One header board lesser calorie (figure does not show) is installed on the described header board lesser calorie connector 14, described header board lesser calorie is provided with microphone interface and earphone interface, described header board lesser calorie makes the detective pin 7 and microphone pin 6 conductings of described header board lesser calorie connector 24 when connecting a microphone on microphone interface, and when connecting an earphone on the earphone interface, make the detective pin 7 and 10 conductings of earphone pin of described header board lesser calorie connector 24, because the voltage that the detective pin S of described audio coder-decoder chip 22 produces is constant, so the current value that the detective pin S of described audio coder-decoder chip 22 obtains under two kinds of conducting situations is inequality, whereby, described audio coder-decoder chip 22 can be microphone or earphone according to what connect on the judgement of the size of current on the detective pin S header board lesser calorie, thereby the duty of determining audio coder-decoder chip 22 is audio frequency input or audio frequency output.
At this moment, because microphone pin 6 and earphone pin 10 are connected with the detective pin S of described audio coder-decoder chip 22 with R2 by first and second resistance R 1 respectively, and detectable signal pin 7 ground connection, therefore, the header board lesser calorie produces crosstalk signal on audio circuit for motherboard can pass through the direct ground connection of low impedance path, and can not be transferred to described audio coder-decoder chip 22, thereby the automatic detecting function of guaranteeing described audio coder-decoder chip 22 normally carries out.
In addition, in order to ensure described audio coder-decoder chip 22 ends is high impedance, to guarantee that crosstalk signal can not be transferred to the detective pin S of described audio coder-decoder chip 22, described first and second resistance R 1 and R2 should be located at the position near described audio coder-decoder chip 22.
Claims (3)
- [claim 1] a kind of audio circuit for motherboard, comprise an audio coder-decoder chip and the little card connector of a header board, described audio coder-decoder chip comprises a detective pin, the little card connector of described header board comprises a detectable signal pin, one microphone pin and an earphone pin, it is characterized in that: the detectable signal pin ground connection of the little card connector of described header board, microphone pin is connected with the detective pin of described audio coder-decoder chip by one first resistance, and the earphone pin is connected with the detective pin of described audio coder-decoder chip by one second resistance.
- [claim 2] audio circuit for motherboard as claimed in claim 1 is characterized in that: the resistance value of described first resistance is 20KOhm, and the resistance value of described second resistance is 39.2KOhm.
- [claim 3] audio circuit for motherboard as claimed in claim 1 is characterized in that: described first and second resistance are located at the position near described audio coder-decoder chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007102023224A CN101425005B (en) | 2007-10-31 | 2007-10-31 | Audio circuit for motherboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007102023224A CN101425005B (en) | 2007-10-31 | 2007-10-31 | Audio circuit for motherboard |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101425005A true CN101425005A (en) | 2009-05-06 |
| CN101425005B CN101425005B (en) | 2011-03-23 |
Family
ID=40615643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007102023224A Expired - Fee Related CN101425005B (en) | 2007-10-31 | 2007-10-31 | Audio circuit for motherboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101425005B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107734430A (en) * | 2017-10-27 | 2018-02-23 | 郑州云海信息技术有限公司 | A kind of ESS voicefrequency circuits denoising structure and noise-reduction method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6970752B1 (en) * | 2000-05-17 | 2005-11-29 | Hewlett-Packard Development Company, L.P. | Method and apparatus for detecting switch closures |
| CN100354854C (en) * | 2002-06-28 | 2007-12-12 | 上海奔流电子有限公司 | Universal musical player module |
| CN2875008Y (en) * | 2005-05-12 | 2007-02-28 | 上海环达计算机科技有限公司 | Electromagnetic interference preventing circuit of audio interface |
-
2007
- 2007-10-31 CN CN2007102023224A patent/CN101425005B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107734430A (en) * | 2017-10-27 | 2018-02-23 | 郑州云海信息技术有限公司 | A kind of ESS voicefrequency circuits denoising structure and noise-reduction method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101425005B (en) | 2011-03-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110323 Termination date: 20111031 |