CN201590071U - Audio input amplitude-limiting circuit - Google Patents
Audio input amplitude-limiting circuit Download PDFInfo
- Publication number
- CN201590071U CN201590071U CN2009202619985U CN200920261998U CN201590071U CN 201590071 U CN201590071 U CN 201590071U CN 2009202619985 U CN2009202619985 U CN 2009202619985U CN 200920261998 U CN200920261998 U CN 200920261998U CN 201590071 U CN201590071 U CN 201590071U
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- Prior art keywords
- voltage stabilizing
- stabilizing diode
- audio input
- voltage
- input port
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- 230000000087 stabilizing effect Effects 0.000 claims description 84
- 230000015556 catabolic process Effects 0.000 description 4
- 230000005236 sound signal Effects 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Abstract
The utility model relates to an audio input amplitude-limiting circuit which comprises at least two voltage regulation diodes being in homopolar connection, wherein the voltage regulation diodes are in series connected between an audio input port and a grounding point. In the audio input amplitude-limiting circuit with amplitude-limiting function, at least two voltage regulation diode being in homopolar connection are in series connected between the audio input port and the grounding point, so that, the audio input amplitude-limiting circuit has the amplitude-limiting function, also can prevent the audio input signal from being distorted, and conveniently achieves the purpose of no distortion of the audio input signal within different amplitude-limiting ranges; and since two voltage regulation diodes are adopted, the cost is lower.
Description
[technical field]
The utility model relates to the image documentation equipment circuit arrangement, particularly a kind of audio frequency input range restricting circuits.
[background technology]
The signal processing main chip of audio-visual equipment such as televisor is to the generally restriction to some extent of amplitude size of external audio input, the peak value that is forward and negative sense must be less than a certain limit value, simultaneously also be in order to prevent that sealing in spike in the audio input signal disturbs, so can connect a voltage stabilizing diode on the audio input interface of common audio-visual equipment to ground, realize the clamp and the elimination spike of signal amplitude are disturbed.But because the forward characteristic of voltage stabilizing diode, after being its conducting, both end voltage is fixed on a fixed voltage value, when the negative peak value of audio input signal surpasses this fixed voltage value, the negative polarity part of sound signal will be reamed the part above this fixed voltage value, cause the sound signal distortion, and then in loudspeaker, send the voice signal of distortion.
[utility model content]
Based on this, be necessary to provide a kind of audio frequency input range restricting circuits that can amplitude limit can not make the sound signal distortion again.
A kind of audio frequency input range restricting circuits comprises at least two homopolarities voltage stabilizing diode that links to each other, and described voltage stabilizing diode is serially connected between audio input port and the earth point.
Preferably, described voltage stabilizing diode comprises first voltage stabilizing diode and second voltage stabilizing diode, the positive pole of described first voltage stabilizing diode connects the positive pole of described second voltage stabilizing diode, the described first voltage stabilizing diode negative pole connects in described audio input port and the ground connection any, and the described second voltage stabilizing diode negative pole connects in described audio input port and the ground connection another.
Preferably, described voltage stabilizing diode comprises first voltage stabilizing diode and second voltage stabilizing diode, the negative pole of described first voltage stabilizing diode connects the negative pole of described second voltage stabilizing diode, described first voltage stabilizing diode is anodal to connect in described audio input port and the ground connection any, and described second voltage stabilizing diode is anodal to connect in described audio input port and the ground connection another.
Preferably, the quantity of described voltage stabilizing diode is two.
Above-mentioned audio frequency input range restricting circuits, the voltage stabilizing diode that adopts at least two homopolarities to link to each other is serially connected between audio input port and the earth point, can play the amplitude limit effect, can guarantee that also audio input signal can distortion, also can realize in different amplitude limit scopes that easily audio input signal is undistorted.
In addition, adopt two voltage stabilizing diodes, cost is less.
[description of drawings]
Fig. 1 is an embodiment sound intermediate frequency input range restricting circuits structural representation.
[embodiment]
The forward characteristic of voltage stabilizing diode is that when the voltage stabilizing diode forward conduction, the voltage at its two ends is stabilized in a fixed voltage value; The reverse characteristic of voltage stabilizing diode is meant that when the voltage stabilizing diode reverse breakdown, the voltage at its two ends is stabilized in the nominal value of voltage stabilizing diode.
Fig. 1 is an embodiment sound intermediate frequency input range restricting circuits structural representation, this circuit comprises voltage stabilizing diode, voltage stabilizing diode is arranged between audio input port (IN) and the earth point, and voltage stabilizing diode comprises the first voltage stabilizing diode D1 and the second stabilivolt D2.
The first voltage stabilizing diode D1 links to each other with the second voltage stabilizing diode D2 homopolarity, is serially connected in then between audio input port (IN) and the earth point.Among one embodiment, the positive pole of the first voltage stabilizing diode D1 connects the positive pole of the second stabilivolt D2; Among the first voltage stabilizing diode D1 and the second voltage stabilizing diode D2, the negative pole of any one voltage stabilizing diode connects audio input port (IN), the minus earth of another voltage stabilizing diode.
In order to further specify the above-mentioned audio frequency input range restricting circuits course of work, in the present embodiment with the audio input signal maximum magnitude of silicon voltage regulator diode, audio ﹠ video equipment for-2.8V～+ 2.8V is an example.
The first voltage stabilizing diode D1 and the second voltage stabilizing diode D2 are silicon voltage regulator diode, and during forward conduction, two voltage stabilizing diode both end voltage all are stabilized in 0.7V; During reverse breakdown, the voltage nominal value at two voltage stabilizing diode two ends is elected 2.4V as.Simultaneously, the negative pole of the first voltage stabilizing diode D1 connects audio input port (IN), the second voltage stabilizing diode D2 ground connection.When first voltage stabilizing diode is in the forward conduction state, then the first voltage stabilizing diode both end voltage is stabilized in 0.7V, second voltage stabilizing diode is in the reverse breakdown state, then the second voltage stabilizing diode both end voltage is stabilized in nominal value 2.4V, so the limiting voltage of audio input port be first voltage stabilizing diode and second voltage stabilizing diode burning voltage and, promptly-3.1V.
First voltage stabilizing diode is in the reverse breakdown state, then the first voltage stabilizing diode both end voltage is stabilized in nominal value 2.4V, second voltage stabilizing diode is in the forward conduction state, then the second voltage stabilizing diode both end voltage is stabilized in 0.7V, so the limiting voltage of audio input port be first voltage stabilizing diode and second voltage stabilizing diode burning voltage and, promptly+3.1V.The amplitude size of the audio input signal of audio-visual equipment can be limited to like this-(2.4+0.7) V～+ (2.4+0.7) V, promptly-3.1V～+ 3.1V.
Even like this signal voltage range-the 2.8V of audio input port input～+ 2.8V, all in the amplitude range that limits, can not produce clipping distortion, also can suppress the spike disturbing pulse that may sneak into simultaneously.
In different embodiment, the scope of amplitude limit is according to actual needs selected the voltage stabilizing diode of suitable nominal value.Need satisfy following condition: amplitude limit value is voltage stabilizing diode forward conduction voltage stabilizing value and voltage stabilizing diode nominal value sum.
Among another embodiment, the negative pole of the first voltage stabilizing diode D1 connects the negative pole of the second stabilivolt D2; Among the first voltage stabilizing diode D1 and the second voltage stabilizing diode D2, the positive pole of any one voltage stabilizing diode connects audio input port (IN), the plus earth of another voltage stabilizing diode.
In addition, the quantity of voltage stabilizing diode also can be three etc.
Above-mentioned audio frequency input range restricting circuits, the voltage stabilizing diode that adopts at least two homopolarities to link to each other is serially connected between audio input port and the earth point, can play the amplitude limit effect, can guarantee that also audio input signal can distortion, also can realize in different amplitude limit scopes that easily audio input signal is undistorted.
In addition, adopt two voltage stabilizing diodes, cost is less.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (4)
1. audio frequency input range restricting circuits is characterized in that: comprise at least two homopolarities voltage stabilizing diode that links to each other, described voltage stabilizing diode is serially connected between audio input port and the earth point.
2. audio frequency input range restricting circuits according to claim 1, it is characterized in that: described voltage stabilizing diode comprises first voltage stabilizing diode and second voltage stabilizing diode, the positive pole of described first voltage stabilizing diode connects the positive pole of described second voltage stabilizing diode, the described first voltage stabilizing diode negative pole connects in described audio input port and the ground connection any, and the described second voltage stabilizing diode negative pole connects in described audio input port and the ground connection another.
3. audio frequency input range restricting circuits according to claim 1, it is characterized in that: described voltage stabilizing diode comprises first voltage stabilizing diode and second voltage stabilizing diode, the negative pole of described first voltage stabilizing diode connects the negative pole of described second voltage stabilizing diode, described first voltage stabilizing diode is anodal to connect in described audio input port and the ground connection any, and described second voltage stabilizing diode is anodal to connect in described audio input port and the ground connection another.
4. audio frequency input range restricting circuits according to claim 1 is characterized in that: the quantity of described voltage stabilizing diode is two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202619985U CN201590071U (en) | 2009-12-23 | 2009-12-23 | Audio input amplitude-limiting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202619985U CN201590071U (en) | 2009-12-23 | 2009-12-23 | Audio input amplitude-limiting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201590071U true CN201590071U (en) | 2010-09-22 |
Family
ID=42749860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202619985U Expired - Fee Related CN201590071U (en) | 2009-12-23 | 2009-12-23 | Audio input amplitude-limiting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201590071U (en) |
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2009
- 2009-12-23 CN CN2009202619985U patent/CN201590071U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20100922 Termination date: 20121223 |