CN218550160U - Audio frequency amplitude limiting circuit - Google Patents
Audio frequency amplitude limiting circuit Download PDFInfo
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- CN218550160U CN218550160U CN202222356407.0U CN202222356407U CN218550160U CN 218550160 U CN218550160 U CN 218550160U CN 202222356407 U CN202222356407 U CN 202222356407U CN 218550160 U CN218550160 U CN 218550160U
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Abstract
The utility model discloses an audio frequency amplitude limiting circuit is connected with loudspeaker, include: a current adjusting unit and a shunt unit; the current adjusting unit receives an input signal and is connected with the shunting unit, and the current adjusting unit is used for adjusting the current of the shunting unit; the shunting unit still with loudspeaker are connected, the shunting unit is used for when the incoming signal surpasses first voltage right incoming signal shunts to control loudspeaker's signal is not more than the settlement threshold value. The utility model discloses when input signal voltage is too big, when spike appears promptly, through the reposition of redundant personnel unit is right input signal shunts, so that loudspeaker are no longer than and set for the threshold value, have avoided the influence of unusual spike to consumer's hearing.
Description
Technical Field
The utility model relates to an audio frequency technical field especially relates to an audio frequency amplitude limiting circuit.
Background
The USB sound card chip is multimedia hardware inserted into a USB hole of a computer, so the USB sound card chip belongs to an external independent sound card, supports software functions of tuning and changing sound, karaoke, recording, live broadcasting and the like, and replaces hardware functions of a computer integrated sound card. However, the current USB sound card chip directly outputs a driving signal to drive the speaker, and when there is an abnormal peak signal at the input end of the USB sound card, the driving signal will impact the speaker through the output end of the USB sound card, which affects the hearing of the consumer.
Accordingly, the prior art is yet to be improved and developed.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned prior art not enough, the utility model aims to provide an audio frequency amplitude limiting circuit to solve the unusual spike signal impact loudspeaker of USB sound card input and influence the problem of consumer's hearing.
The technical scheme of the utility model as follows:
an audio limiting circuit, coupled to a speaker, comprising: a current adjusting unit and a shunt unit;
the current adjusting unit receives an input signal and is connected with the shunting unit, and the current adjusting unit is used for adjusting the current of the shunting unit;
the reposition of redundant personnel unit still with loudspeaker are connected, the reposition of redundant personnel unit is used for right when incoming signal surpasss first voltage incoming signal shunts, in order to control loudspeaker's signal is no longer than setting for the threshold value.
The utility model discloses a further setting, audio frequency amplitude limiting circuit still includes: a clamp pressure protection unit;
the clamp voltage protection unit is respectively connected with the shunt unit and the current adjustment unit, and is used for limiting the maximum current of the shunt unit.
The utility model discloses a further set up, the reposition of redundant personnel unit includes: the circuit comprises a first resistor, a first triode, a second resistor and a second triode;
the base electrode of the first triode is respectively connected with the current adjusting unit, one end of the clamp voltage protecting unit, one end of the first resistor and the emitting electrode of the second triode;
an emitting electrode of the first triode is respectively connected with one end of the second resistor, a negative end of the input signal, the other end of the clamp voltage protection unit and a base electrode of the second triode;
the collector of the first triode is respectively connected with the other end of the first resistor and one end of the horn;
and the collector of the second triode is respectively connected with the other end of the second resistor and the other end of the horn.
The utility model discloses a further set up, the reposition of redundant personnel unit includes: the circuit comprises a first resistor, a first triode, a second resistor, a fourth resistor and a second triode;
the base electrode of the first triode is respectively connected with the current adjusting unit, one end of the clamp voltage protecting unit, one end of the first resistor and the emitting electrode of the second triode;
an emitting electrode of the first triode is respectively connected with one end of the second resistor, the other end of the clamp voltage protection unit and a base electrode of the second triode;
a collector of the first triode is respectively connected with the other end of the first resistor and one end of the fourth resistor, and the other end of the fourth resistor is connected with one end of the horn;
and the collector of the second triode is respectively connected with the other end of the second resistor and the other end of the horn and grounded.
The utility model discloses a further setting, the pincers pressure protection unit includes: a first diode and a second diode;
the anode of the first diode is respectively connected with the current adjusting unit, the cathode of the second diode, the base of the first triode and the emitter of the second triode;
and the cathode of the first diode is respectively connected with the negative end of the input signal, the anode of the second diode, the emitter of the first triode and the base of the second triode.
The utility model discloses a further setting, the pincers pressure protection unit includes: a first diode and a second diode;
the anode of the first diode is respectively connected with the current adjusting unit, the cathode of the second diode, the base of the first triode and the emitter of the second triode;
and the cathode of the first diode is respectively connected with the anode of the second diode, the emitter of the first triode and the base of the second triode.
The utility model discloses a further setting, the current adjustment unit includes: a third resistor;
one end of the third resistor receives the input signal, and the other end of the third resistor is connected with the shunt unit.
The utility model discloses a further setting, first triode is the NPN pipe.
The utility model discloses a further setting, the second triode is the NPN pipe.
In a further aspect of the present invention, the third resistor is a potentiometer.
The utility model provides an audio frequency amplitude limiting circuit is connected with loudspeaker, include: a current adjusting unit and a shunt unit; the current adjusting unit receives an input signal and is connected with the shunting unit, and the current adjusting unit is used for adjusting the current of the shunting unit; the shunting unit still with loudspeaker are connected, the shunting unit is used for when the incoming signal surpasses first voltage right incoming signal shunts to control loudspeaker's signal is not more than the settlement threshold value. The utility model discloses when input signal voltage is too big, when spike appears promptly, through the reposition of redundant personnel unit is right input signal shunts, so that loudspeaker are no longer than and set for the threshold value, have avoided the influence of unusual spike to consumer's hearing.
Drawings
In order to clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic block diagram of the middle audio limiting circuit of the present invention.
Fig. 2 is a circuit diagram of the differential output of the middle audio frequency limiting circuit of the present invention.
Fig. 3 is a circuit diagram of the single-ended output of the middle audio frequency limiter circuit of the present invention.
Detailed Description
The utility model provides an audio frequency amplitude limiting circuit, for making the utility model discloses a purpose, technical scheme and effect are clearer, make clear and definite, and it is right that the following refers to the attached drawing and lifts the example the utility model discloses further detailed description. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description and claims, the terms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. If there is a description in an embodiment of the present invention referring to "first", "second", etc., the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1 to 3, the present invention provides a preferred embodiment of an audio limiting circuit.
As shown in fig. 1, the utility model provides an audio frequency amplitude limiting circuit is connected with loudspeaker, include: a current adjusting unit 100 and a shunt unit 200; the current adjusting unit 100 receives an input signal and is connected to the shunting unit 200, and the current adjusting unit 100 is configured to adjust a current of the shunting unit 200; the shunting unit 200 still with loudspeaker are connected, shunting unit 200 is used for when the input signal surpasses first voltage right the input signal shunts to the control flows through the signal of loudspeaker is not more than setting for the threshold value, has avoided the influence of unusual spike signal to consumer's hearing.
Specifically, the current adjustment unit 100 receives the input signal and outputs the input signal to the shunt unit 200, when the amplitude of the input signal is small, that is, when the input signal does not have a spike signal, the input signal passes through the current adjustment unit 100 and is output to the shunt unit 200, because the amplitude of the input signal does not exceed the first voltage of the shunt unit 200, the shunt unit 200 does not shunt the horn, and the horn normally receives the input signal. The first voltage is a limit voltage at which the shunt unit 200 starts shunting, and a specific value is not limited. When the input signal amplitude is too large, that is, when the input signal has a spike signal, the input signal passes through the current adjustment unit 100 and is output to the shunt unit 200, and the current adjustment unit 100 is configured to adjust the current of the shunt unit 200, so as to set the threshold value of the horn signal. The unit 200 that shunts is used for right the input signal shunts, wherein, input signal does the signal of shunting unit 200 with flow through the stack of loudspeaker signal, the size that the unit 200 shunts changes along with input signal's size, promptly the input signal amplitude is big more, the signal of shunting unit 200 is big more, and then guarantees to flow through the signal of loudspeaker is automatic to be maintained in stable sound pressure level to protection consumer's hearing.
In some embodiments, as shown in fig. 1, the audio limiting circuit further comprises: a clamp voltage protection unit 300; the clamp voltage protection unit 300 is respectively connected to the shunt unit 200 and the current adjustment unit 100, and the clamp voltage protection unit 300 is configured to limit the maximum current of the shunt unit 200.
Specifically, two ends of the clamp voltage protection unit 300 are connected to the shunt unit 200, and when the amplitude of the input signal is large, that is, when the input signal has a spike signal, the clamp voltage protection unit 300 is configured to limit the maximum current of the shunt unit 200, so as to avoid the shunt unit 200 from being burned out due to an excessive current.
In some embodiments, referring to fig. 2 or fig. 3, the current adjusting unit 100 includes: a third resistor R3; one end of the third resistor R3 receives the input signal, and the other end of the third resistor R3 is connected to the shunt unit 200;
specifically, the third resistor R3 adjusts the magnitude of the current in the shunt unit 200 by changing the resistance of the resistor, so that the threshold value of the current flowing through the horn can be set. If a small amount of spikes still exist in the shunt unit 200, the current flowing through the horn can be further increased by increasing the third resistance value, so that the current flowing through the horn is reduced, the horn is maintained at a stable sound pressure level, and the hearing of a user is protected. The third resistor R3 may be a resistor box, a sliding rheostat, or a potentiometer, and is not particularly limited.
In one embodiment, as shown in fig. 2, the flow dividing unit 200 includes: the circuit comprises a first resistor R1, a first triode Q1, a second resistor R2 and a second triode Q2;
the base b of the first triode Q1 1 Respectively connected with the current adjusting unit 100, one end of the clamp voltage protection unit 300, one end of the first resistor R1, and the emitter e of the second triode Q2 2 Connecting; the emitter e of the first triode 1 Respectively connected to one end of the second resistor R2, the negative end P2 of the input signal, the other end of the clamp voltage protection unit 300, and the base b of the second triode Q2 2 Connecting; a collector c of the first triode Q1 1 The other end of the first resistor R1 and one end of the loudspeaker are respectively connected; a collector c of the second triode Q2 2 And the other end of the second resistor R2 and the other end of the horn are respectively connected.
Specifically, the input signal is transmitted differentially, where the differential transmission refers to transmission of signals on two lines, and the signals on the two lines have the same amplitude and opposite phases. A positive end P1 of the input signal is connected to the current adjusting unit 100, and a negative end P2 of the input signal is respectively connected to the clamp voltage protecting unit 300 and the emitter e of the first triode 1 A base electrode b of the second triode 2 And the second resistor R2 is connected. Due to the use of differential transmission, the inputThe positive end P1 and the negative end P2 of the signal have the same signal amplitude and opposite directions, so that when a peak signal exists in the input signal, the interference on the two sides of the signal at the positive end and the signal at the negative end can be balanced through the input signal, and the noise of the loudspeaker is reduced.
The first resistor R1 is arranged at the base b of the first triode Q1 1 And a collector c of the first triode Q1 1 And providing a bias for the first triode Q1 so as to enable the first triode Q1 to enter an amplifying state. When the first triode Q1 works in an amplifying state, the base current of the first triode Q1 can linearly control the conduction depth of the first triode Q1, i.e. the current on the collector path of the first triode Q1. That is, the base current of the first transistor Q1 is linear and proportional to the current in the collector path of the first transistor Q1, and when the base current of the first transistor Q1 increases, the current in the collector path of the first transistor Q1 increases synchronously. The first resistor R1 is arranged at the base b of the first triode Q1 1 And the collector c of the first triode Q1 1 And the first resistor R1 provides a bias, and when the first triode Q1 is switched on, the first resistor R1 can also adjust the base current of the first triode Q1 according to the resistance of the first resistor R1, thereby adjusting the switching-on depth of the first triode Q1. Similarly, the second resistor R2 is the same, and is not described in detail.
The first triode Q1 is an NPN tube, and the second triode Q2 is an NPN tube. The first triode Q1 and the first resistor R1 are used for shunting the input signal when the forward amplitude of the input signal exceeds a first voltage. The second triode Q2 and the second resistor R2 are used for shunting the input signal when the negative amplitude of the input signal exceeds the first voltage. The first voltage is a threshold voltage between a middle emitter and a base of the first triode Q1 or the second triode Q2.
When the forward amplitude of the input signal is small, the forward amplitude of the input signal cannot exceed the base b in the first triode Q1 1 And an emitter e 1 The first triode Q1 cannot be turned on due to the threshold voltage therebetween, and the input signal returns to the negative end P2 through the positive end P1, the current adjusting unit 100, the first resistor R1, the horn, and the second resistor R2. Wherein, first resistance R1 with second resistance R2 plays the current-limiting effect, prevents that input signal electric current is too big, burns out loudspeaker, first triode Q1 is right input signal does not have the reposition of redundant personnel effect, loudspeaker pass through first resistance R1 normally receives input signal. When the positive amplitude of the input signal is too large, the positive amplitude exceeds the base b in the first triode Q1 1 And an emitter e 1 At a threshold voltage therebetween, the first triode Q1 is turned on, i.e., the collector c of the first triode Q1 1 And the emitter e of the first triode Q1 1 The first triode Q1 shunts the forward signal, the larger the amplitude of the input signal is, the deeper the conduction depth of the first triode Q1 is, and the current passes through the collector c of the first triode Q1 1 And the emitting electrode e of the first triode Q1 1 The larger the current is, the more the input signal flowing through the speaker is automatically maintained within a stable sound pressure level, thereby protecting the hearing of the consumer.
When the negative amplitude of the input signal is small, the negative amplitude of the input signal cannot exceed the base b in the second triode Q2 2 And an emitter e 2 The second triode Q2 cannot be turned on due to the threshold voltage therebetween, the second triode Q2 has no shunting effect on the input signal, and the input signal passes through the negative end P2, the second resistor R2, the horn, the first resistor R1, and the current adjusting unit 100 and returns to the positive end P2. Wherein, first resistance R1 with second resistance R2 plays the current-limiting effect, prevents that input signal electric current is too big, burns out loudspeaker, second triode Q2 is right input signal does not have the reposition of redundant personnel effect, loudspeaker pass through second resistance R2 receives input signal. When the negative amplitude of the input signal is too large, the amplitude exceedsPassing through the base b of the second triode Q2 2 And an emitter e 2 At the threshold voltage therebetween, the second triode Q2 is turned on, i.e., the collector c of the second triode Q2 2 And the emitting electrode e of the second triode Q2 2 The second triode Q2 shunts the negative signal, the larger the amplitude of the input signal is, the deeper the conduction depth of the second triode Q2 is, and the current passes through the collector c of the second triode Q2 2 And the emitting electrode e of the second triode Q2 2 So that the input signal flowing through the speaker is automatically maintained within a stable sound pressure level, thereby protecting the hearing of the consumer.
It should be noted that the current adjusting unit 100 may further adjust the collector current of the first triode Q1 or the second triode Q2 by adjusting the base current of the first triode Q1 or the second triode Q2, that is, adjust the shunting action on the input current, so as to adjust the current flowing through the speaker.
In some embodiments, as shown in fig. 2, the clamping pressure protection unit 300 includes: a first diode VD1 and a second diode VD2; the anode of the first diode VD1 is connected to the current adjusting unit 100, the cathode of the second diode VD2, and the base b of the first triode respectively 1 And an emitter e of the second triode 2 Connecting; the negative electrode of the first diode VD1 is respectively connected with the negative end P2 of the input signal, the positive electrode of the second diode VD2 and the emitter e of the first triode 2 And a base b of the second triode 2 And (4) connecting.
Specifically, first diode VD1 with second diode VD2 is the switch tube, first diode VD 1's positive pole passes through current adjustment unit 100 with input signal's positive terminal P1 is connected, first diode VD 1's negative pole with input signal's negative going end P2 is connected, and first diode VD 1's positive pole still with first triode Q1's base b 1 Connected, the negative electrode of the first diode VD1 is also connected with the emitter e of the first triode Q1 1 Connecting; when the amplitude of the input signal is too large, the first diode VD1 is the base b of the first triode Q1 1 And limiting the positive half-cycle voltage so as to limit the highest base voltage of the first triode and further limit the maximum base current of the first triode, thereby preventing the input signal from burning out the first triode Q2 excessively.
The negative pole of the second diode VD2 is connected to the positive end P1 of the input signal through the current adjusting unit 100, the positive pole of the second diode VD2 is connected to the negative end P2 of the input signal, and the positive pole of the second diode VD2 is further connected to the base b of the second triode Q2 1 The cathode of the second diode VD2 is also connected with the emitter e of the second triode Q2 2 Connecting; when the amplitude of the input signal is too large, the second diode VD2 is used for limiting the negative half-cycle voltage amplitude limit of the base electrode of the second triode Q2 so as to limit the highest base electrode voltage of the second triode Q2 and further limit the maximum base electrode current of the second triode Q2, and therefore the second triode Q2 is prevented from being burnt out due to the fact that the input signal is too large.
In another embodiment, as shown in fig. 3, the shunting unit 200 includes: the circuit comprises a first resistor R1, a first triode Q1, a second resistor R2, a fourth resistor R4 and a second triode Q2; the base b of the first triode Q1 1 Respectively connected with the current adjusting unit 100, one end of the clamp voltage protection unit 300, one end of the first resistor R1, and the emitter e of the second triode Q2 2 Connecting; an emitter e of the first triode Q1 1 Respectively connected with one end of the second resistor R2, the other end of the clamp voltage protection unit 300 and the base b of the second triode Q2 2 Connecting; a collector c of the first triode Q1 1 The other end of the first resistor R1 and one end of the fourth resistor R4 are respectively connected, and the other end of the fourth resistor R4 is connected with one end of the horn; a collector c of the second triode Q2 2 And the other end of the second resistor R2 and the other end of the horn are respectively connected and grounded.
Specifically, as shown in fig. 3, the input signal adopts single-ended transmission, where the single-ended transmission refers to transmitting a signal by using a signal line and a ground line, and the signal transmitted on the signal line is a single-ended signal. The input signal is transmitted to the shunt unit 200 through the input end P3 and the current adjusting unit 100, and the shunt unit 200 is grounded. The fourth resistor R4 is disposed between the shunt unit 200 and the speaker, and the fourth resistor R4 is configured to weaken a spike of the input signal.
When the forward amplitude of the input signal is small, the forward amplitude of the input signal cannot exceed the base b in the first triode Q1 1 And an emitter e 1 The first triode Q1 cannot be turned on due to the threshold voltage therebetween, and the input signal returns to the ground through the input terminal P3, the current adjusting unit 100, the first resistor R1, and the fourth resistor R4. Wherein, first resistance R1 plays the current-limiting effect, prevents that input signal electric current is too big, burns out loudspeaker, first triode Q1 is right input signal does not have the reposition of redundant personnel effect, loudspeaker pass through first resistance R1 normally receives input signal.
When the positive amplitude of the input signal is too large, the positive amplitude exceeds the base b in the first triode Q1 1 And an emitter e 1 At a threshold voltage therebetween, the first triode Q1 is turned on, i.e., the collector c of the first triode Q1 1 And an emitter e of the first triode Q1 1 The first triode Q1 shunts the forward signal, the larger the amplitude of the input signal is, the deeper the conduction depth of the first triode Q1 is, and the current passes through the collector c of the first triode Q1 1 And the emitting electrode e of the first triode Q1 1 The larger the current, the more the input signal flowing through the speaker is automatically maintained in a stable sound pressure level, thereby protecting the hearing of the consumer.
When the negative amplitude of the input signal is small, the negative amplitude cannot exceed the threshold voltage between the base b2 and the emitter e2 in the second triode Q2, so that the second triode Q2 cannot be conducted, the second triode Q2 has no shunting effect on the input signal, and the input signal is conductedThe ground terminal, the horn, the fourth resistor R4, the first resistor R1, and the current adjusting unit 100 return to the input terminal P3. The first resistor R1 plays a role in limiting current, prevents that input signal current is too large and burns out the loudspeaker, the second triode Q2 is right the input signal does not have a shunting effect, and the loudspeaker passes through the second resistor R2 receives the input signal. When the negative amplitude of the input signal is too large, the negative amplitude exceeds the base b in the second triode Q2 2 And an emitter e 2 At the threshold voltage therebetween, the second triode Q2 is turned on, i.e., the collector c of the second triode Q2 2 And the emitting electrode e of the second triode Q2 2 The second triode Q2 shunts the negative signal, the larger the amplitude of the input signal is, the deeper the conduction depth of the second triode Q2 is, and the current passes through the collector c of the second triode Q2 2 And the emitting electrode e of the second triode Q2 2 The larger the current of the loudspeaker is, the more the negative signal flowing through the loudspeaker is automatically maintained within a stable sound pressure level, thereby protecting the hearing of the consumer.
In some embodiments, as shown in fig. 2, the clamping pressure protection unit 300 includes: a first diode VD1 and a second diode VD2; the anode of the first diode VD1 is connected to the current adjusting unit 100, the cathode of the second diode VD2, and the base b of the first triode Q1 1 And an emitter e of the second transistor Q2 2 Connecting; the cathode of the first diode VD1 is respectively connected with the anode of the second diode VD2 and the emitter e of the first triode Q1 1 And a base b of the second triode Q2 2 And (4) connecting.
Specifically, as shown in fig. 3, the first diode Q1 and the second diode Q2 are switching tubes, the anode of the first diode VD1 is connected to the input end P3 of the input signal through the current adjusting unit 100, the cathode of the first diode VD1 is grounded through the second resistor R2, and the anode of the first diode VD1 is also connected to the base b of the first triode Q1 1 Connected, the negative electrode of the first diode VD1 is also connected with the first triodeEmitter e of Q1 1 Connecting; when the amplitude of the input signal is too large, the first diode VD1 is the amplitude limit of the positive half-cycle voltage of the base of the first triode Q1 so as to limit the highest base voltage of the first triode and further limit the maximum base current of the first triode Q1, and therefore the first triode Q1 is prevented from being burnt out due to too large input signal.
The negative pole of the second diode VD2 is connected to the input terminal P3 of the input signal through the current adjusting unit 100, the negative pole of the first diode VD1 is grounded through the second resistor R2, and the positive pole of the second diode VD2 is further connected to the base b of the second triode Q2 1 The cathode of the second diode VD2 is also connected with the emitter e of the second triode Q2 2 Connecting; when the amplitude of the input signal is too large, the second diode VD2 is used for limiting the negative half-cycle voltage amplitude limit of the base electrode of the second triode VD2 so as to limit the highest base electrode voltage of the second triode and further limit the maximum base electrode current of the second triode Q2, and therefore the second triode Q2 is prevented from being burnt out due to too large input signal.
To sum up, the utility model provides an audio frequency amplitude limiting circuit is connected with loudspeaker, include: a current adjusting unit and a shunt unit; the current adjusting unit receives an input signal and is connected with the shunting unit, and the current adjusting unit is used for adjusting the current of the shunting unit; the shunting unit is used for shunting the input signal when the input signal exceeds a first voltage so as to control the signal of the loudspeaker not to exceed a set threshold value. The utility model discloses when input signal voltage is too big, when spike appears promptly, through the reposition of redundant personnel unit is right input signal shunts, so that loudspeaker are no longer than and set for the threshold value, have avoided the influence of unusual spike to consumer's hearing.
It should be understood that the application of the present invention is not limited to the above examples, and that modifications or changes can be made by those skilled in the art based on the above description, and all such modifications and changes are intended to fall within the scope of the appended claims.
Claims (10)
1. An audio limiting circuit, is connected with loudspeaker, its characterized in that includes: a current adjusting unit and a shunt unit;
the current adjusting unit receives an input signal and is connected with the shunting unit, and the current adjusting unit is used for adjusting the current of the shunting unit;
the shunting unit still with loudspeaker are connected, the shunting unit is used for when the incoming signal surpasses first voltage right incoming signal shunts to the control flows through loudspeaker's signal is no longer than setting for the threshold value.
2. The audio limiting circuit of claim 1, further comprising: a clamp pressure protection unit;
the clamp voltage protection unit is respectively connected with the shunt unit and the current adjustment unit, and is used for limiting the maximum current of the shunt unit.
3. The audio limiting circuit of claim 2, wherein the shunting unit comprises: the circuit comprises a first resistor, a first triode, a second resistor and a second triode;
the base electrode of the first triode is respectively connected with the current adjusting unit, one end of the clamp voltage protecting unit, one end of the first resistor and the emitting electrode of the second triode;
an emitting electrode of the first triode is respectively connected with one end of the second resistor, a negative end of the input signal, the other end of the clamp voltage protection unit and a base electrode of the second triode;
the collector of the first triode is respectively connected with the other end of the first resistor and one end of the horn;
and the collector of the second triode is respectively connected with the other end of the second resistor and the other end of the horn.
4. The audio limiting circuit of claim 2, wherein the shunting unit comprises: the circuit comprises a first resistor, a first triode, a second resistor, a fourth resistor and a second triode;
the base electrode of the first triode is respectively connected with the current adjusting unit, one end of the clamp voltage protecting unit, one end of the first resistor and the emitting electrode of the second triode;
an emitting electrode of the first triode is respectively connected with one end of the second resistor, the other end of the clamp voltage protection unit and a base electrode of the second triode;
a collector of the first triode is respectively connected with the other end of the first resistor and one end of the fourth resistor, and the other end of the fourth resistor is connected with one end of the horn;
and the collector of the second triode is respectively connected with the other end of the second resistor and the other end of the horn and grounded.
5. The audio limiting circuit of claim 3, wherein the clamp voltage protection unit comprises: a first diode and a second diode;
the anode of the first diode is respectively connected with the current adjusting unit, the cathode of the second diode, the base of the first triode and the emitter of the second triode;
and the cathode of the first diode is respectively connected with the negative end of the input signal, the anode of the second diode, the emitter of the first triode and the base of the second triode.
6. The audio limiting circuit of claim 4, wherein the clamp protection unit comprises: a first diode and a second diode;
the anode of the first diode is respectively connected with the current adjusting unit, the cathode of the second diode, the base of the first triode and the emitter of the second triode;
and the cathode of the first diode is respectively connected with the anode of the second diode, the emitter of the first triode and the base of the second triode.
7. The audio limiting circuit of claim 1 wherein the current adjustment unit comprises: a third resistor;
one end of the third resistor receives the input signal, and the other end of the third resistor is connected with the shunt unit.
8. The audio limiting circuit of claim 3 or 4 wherein the first transistor is an NPN transistor.
9. The audio limiting circuit of claim 3 or 4 wherein the second transistor is an NPN transistor.
10. The audio limiting circuit of claim 7 wherein the third resistor is a potentiometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222356407.0U CN218550160U (en) | 2022-09-05 | 2022-09-05 | Audio frequency amplitude limiting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222356407.0U CN218550160U (en) | 2022-09-05 | 2022-09-05 | Audio frequency amplitude limiting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN218550160U true CN218550160U (en) | 2023-02-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222356407.0U Active CN218550160U (en) | 2022-09-05 | 2022-09-05 | Audio frequency amplitude limiting circuit |
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| CN (1) | CN218550160U (en) |
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- 2022-09-05 CN CN202222356407.0U patent/CN218550160U/en active Active
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