CN219678677U - Signal processing circuit - Google Patents
Signal processing circuit Download PDFInfo
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- CN219678677U CN219678677U CN202321339747.0U CN202321339747U CN219678677U CN 219678677 U CN219678677 U CN 219678677U CN 202321339747 U CN202321339747 U CN 202321339747U CN 219678677 U CN219678677 U CN 219678677U
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- 238000001914 filtration Methods 0.000 claims description 10
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- 230000008878 coupling Effects 0.000 description 9
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- 238000013461 design Methods 0.000 description 3
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Abstract
The utility model relates to the technical field of signal processing, and discloses a signal processing circuit, which comprises: the circuit comprises a bias circuit, an anti-reflection circuit, a filter circuit and a voltage dividing circuit, wherein the first end of the bias circuit is connected with a signal source and the first end of the filter circuit; the first end of the anti-reverse circuit is connected with an external power supply, and the second end of the anti-reverse circuit is connected with the second end of the bias circuit; the second end of the filter circuit is connected with the first end of the voltage dividing circuit; the second end of the voltage dividing circuit is a signal output end. The utility model can effectively solve the problem of multi-channel signal crosstalk by utilizing the anti-reflection circuit while improving the signal-to-noise ratio of the channel.
Description
Technical Field
The utility model relates to the technical field of signal processing, in particular to a signal processing circuit.
Background
Along with the rise of digital cabins, the vehicle intelligent degree is higher and higher, the in-vehicle voice control function and the vehicle-mounted KTV function are popularized, the requirements of users on the vehicle-mounted microphones are higher and higher, the requirements on the performance of the vehicle-mounted microphones such as signal to noise ratio, amplitude, crosstalk and other parameters are higher, and the isolation of the vehicle-mounted microphones can be influenced due to the signal crosstalk problem among the plurality of vehicle-mounted microphones, so that the signal to noise ratio of a communication channel is reduced, and the signal transmission quality is poor.
Meanwhile, as the maximum input voltages of different vehicle-mounted microphones are different, the problem of super ADC acquisition range needs to be considered when the ADC acquisition chip is selected, and in order to match the vehicle-mounted microphones with the ADC acquisition chip, the design period and the cost brought by the replacement of the vehicle-mounted microphones are increased.
Disclosure of Invention
Therefore, the utility model aims to solve the technical problems of signal crosstalk and different maximum input voltages among a plurality of vehicle-mounted microphones in the prior art, thereby providing a signal processing circuit.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the present utility model provides a signal processing circuit comprising: the circuit comprises a bias circuit, an anti-reflection circuit, a filter circuit and a voltage dividing circuit, wherein the first end of the bias circuit is connected with a signal source and the first end of the filter circuit and is used for supplying power to the signal source and providing a static working point; the first end of the anti-reflection circuit is connected with an external power supply, and the second end of the anti-reflection circuit is connected with the second end of the bias circuit and is used for forming an anti-crosstalk loop between signals to be processed; the second end of the filter circuit is connected with the first end of the voltage dividing circuit and is used for filtering the signal to be processed and preventing the direct current signal to be processed from passing through; and the second end of the voltage dividing circuit is a signal output end and is used for limiting the voltage of the signal to be processed.
According to the signal processing circuit provided by the utility model, the signal crosstalk among the plurality of vehicle-mounted microphones is restrained by adding the anti-reflection circuit, so that the isolation degree of the vehicle-mounted microphones is improved, and the problem of mutual influence among the plurality of vehicle-mounted microphones during operation is avoided; meanwhile, the voltage of the processing signals is limited through the voltage dividing circuit, so that the vehicle-mounted microphones with different maximum input voltages can be connected in the same control circuit, the signal to noise ratio is improved, and meanwhile, the design period and cost caused by replacing the vehicle-mounted microphones are reduced.
In an alternative embodiment, the bias circuit includes: the first bias circuit is connected with the positive end of the signal source and the first end of the filter circuit, and the second end of the first bias circuit is connected with the second end of the anti-reflection circuit; and the first end of the second bias circuit is connected with the negative end of the signal source and the first end of the filter circuit, and the second end of the second bias circuit is grounded.
The signal processing circuit provided by the utility model is characterized in that the first bias circuit is used for providing a static working point at the positive end of a signal source, and the second bias circuit is used for providing the static working point at the negative end of the signal source.
In an alternative embodiment, the first bias circuit comprises a first resistor and the second bias circuit comprises a second resistor.
In an alternative embodiment, the anti-reflection circuit comprises: and the anode of the first diode is connected with an external power supply, and the cathode of the first diode is connected with the second end of the first bias circuit.
The signal processing circuit provided by the utility model can effectively prevent noise among a plurality of vehicle-mounted microphones from forming a crosstalk loop through a power supply, thereby improving the isolation degree and the signal-to-noise ratio of the vehicle-mounted microphones.
In an alternative embodiment, the filter circuit comprises: the first filter circuit is connected with the first end of the second bias circuit and the first end of the second filter circuit, and the second end of the first filter circuit is connected with the first end of the first bias circuit and the second end of the second filter circuit; and the third end of the second filter circuit is connected with the first end of the voltage dividing circuit.
According to the signal processing circuit provided by the utility model, the first filter circuit is used for improving the antistatic performance of the circuit, reducing the influence of static electricity, surge, overvoltage and the like on the circuit and improving the signal to noise ratio; the second filter circuit is used for preventing the direct current signal to be processed from passing through.
In an alternative embodiment, the first filter circuit includes: the first end of the first capacitor is connected with the first end of the second bias circuit and the first end of the second filter circuit, and the second end of the first capacitor is grounded with the second end of the second capacitor; and the first end of the second capacitor is connected with the first end of the first bias circuit and the second end of the second filter circuit.
In an alternative embodiment, the second filter circuit comprises: the first end of the third capacitor is connected with the first end of the first filter circuit, and the second end of the third capacitor is connected with the first end of the voltage dividing circuit; and the first end of the fourth capacitor is connected with the second end of the first filter circuit, and the second end of the fourth capacitor is connected with the first end of the voltage dividing circuit.
In an alternative embodiment, the filter circuit further comprises: and the first end of the third filter circuit is connected with an external power supply, and the second end of the third filter circuit is connected with the first end of the anti-reflection circuit.
The signal processing circuit provided by the utility model has the advantages that the third filter circuit is used for filtering the power supply noise, and the influence of the power supply noise on the signal to noise ratio of the vehicle-mounted microphone is avoided.
In an alternative embodiment, the third filter circuit comprises: the first end of the inductor is connected with an external power supply; the first end of the fifth capacitor and the sixth capacitor after being connected in parallel is connected with the second end of the inductor, the first end of the seventh capacitor and the first end of the anti-reverse circuit, and the second end of the fifth capacitor and the sixth capacitor after being connected in parallel is grounded; and the second end of the seventh capacitor is grounded.
According to the signal processing circuit provided by the utility model, the LC filter circuit is adopted in the third filter circuit, so that the power supply noise can be effectively generated, and the signal to noise ratio is improved.
In an alternative embodiment, the voltage divider circuit includes: the first ends of the third resistor and the fourth resistor are respectively connected with the second ends of the third capacitor and the fourth capacitor, and the second ends of the third resistor and the fourth resistor are signal output ends; and the first end of the fifth resistor is connected with the second end of the fourth resistor, and the second end of the fifth resistor is grounded.
According to the signal processing circuit provided by the utility model, the input threshold value of the vehicle-mounted microphone is effectively improved by the voltage dividing circuit, and the voltage dividing circuit is arranged behind the second filter circuit, so that the bias voltage of the vehicle-mounted microphone is not divided, and the normal operation of the vehicle-mounted microphone is ensured.
In an alternative embodiment, the signal processing circuit further comprises: and the acquisition chip is connected with the second end of the voltage dividing circuit and is used for acquiring signals output by the voltage dividing circuit.
According to the signal processing circuit provided by the utility model, the vehicle-mounted microphones with different maximum input voltages can be connected to the acquisition chip through the voltage dividing circuit, so that the adaptation degree of the acquisition chip and the vehicle-mounted microphones is improved, and the design period and cost caused by replacement of the vehicle-mounted microphones are reduced.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a composition diagram of one specific example of a differential dc-coupled circuit of the related art;
fig. 2 is a composition diagram of one specific example of a differential ac coupling circuit of the related art;
fig. 3 is a composition diagram of one specific example of a pseudo-differential ac coupling circuit of the related art;
fig. 4 is a block diagram showing a specific example of a signal processing circuit according to an embodiment of the present utility model;
fig. 5 is a composition diagram of another specific example of a signal processing circuit of an embodiment of the present utility model;
fig. 6 is a composition diagram of another specific example of a signal processing circuit of the embodiment of the present utility model;
fig. 7 is a block diagram of a specific circuit of the signal processing circuit according to the embodiment of the present utility model;
fig. 8 is a block diagram of a specific circuit of the multi-channel signal processing circuit according to the embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
In the related art, as shown in fig. 1 to 3, positive and negative differential input ends of a MIC in a differential dc coupling circuit are directly connected with an ADC acquisition chip interface; the positive and negative differential input ends of MIC in the differential AC coupling circuit are connected with the ADC acquisition chip interface through capacitive coupling; the negative end of MIC in the pseudo-differential AC coupling circuit is grounded, and the positive and negative differential input ends of the pseudo-differential AC coupling circuit are respectively connected with the ADC acquisition chip interface through capacitive coupling.
The embodiment of the present utility model is exemplified by a pseudo-differential ac coupling circuit to provide a signal processing circuit, but the utility model is not limited thereto.
An embodiment of the present utility model provides a signal processing circuit, as shown in fig. 4, including: the circuit comprises a bias circuit 1, an anti-reflection circuit 2, a filter circuit 3 and a voltage dividing circuit 4, wherein a first end of the bias circuit 1 is connected with a signal source and a first end of the filter circuit 3 and is used for supplying power to the signal source and providing a static working point; the first end of the anti-reflection circuit 2 is connected with an external power supply, the second end of the anti-reflection circuit is connected with the second end of the bias circuit 1, and the anti-reflection circuit is used for forming an anti-crosstalk loop between signals to be processed; the second end of the filter circuit 3 is connected with the first end of the voltage dividing circuit 4 and is used for filtering the signal to be processed and preventing the direct current signal to be processed from passing through; the second end of the voltage dividing circuit 4 is a signal output end and is used for limiting the voltage of the signal to be processed.
Specifically, the bias circuit is used for supplying power to the signal source and providing a static working point; the anti-reverse circuit is connected between the bias circuit and the external power supply, so that signals among a plurality of signal sources are prevented from flowing reversely through the bias circuit, and a crosstalk loop is formed through the external power supply; the signal is subjected to noise reduction treatment through a filter circuit; the voltage dividing circuit divides the filtered signals with different maximum input voltages so that the signals can be connected with the same control circuit, and meanwhile, the voltage dividing circuit is arranged at the rear end of the filtering circuit, so that the bias voltage of the signal source is prevented from being divided, and the normal operation of the signal source is prevented from being influenced.
In some alternative embodiments, as shown in fig. 5, the bias circuit 1 includes: the first bias circuit 11 and the second bias circuit 12, wherein the first end of the first bias circuit 11 is connected with the positive end of the signal source and the first end of the filter circuit 3, and the second end of the first bias circuit 11 is connected with the second end of the anti-reflection circuit 2; a second bias circuit 12, a first end of which is connected to the negative terminal of the signal source, a first end of the filter circuit 3, and a second end of which is grounded.
Specifically, when the signal source has a positive terminal and a negative terminal, the present embodiment provides bias circuits for both the positive terminal and the negative terminal to achieve impedance matching.
Specifically, the first bias circuit and the second bias circuit are respectively used for providing proper bias current for the positive end and the negative end of the signal source and providing static working points for the positive end and the negative end of the signal source.
In some alternative embodiments, as shown in fig. 7, the first bias circuit 11 includes a first resistor R1 and the second bias circuit includes a second resistor R2.
It should be noted that the types and the number of the resistors may be set according to the actual circuit requirements, and are not limited herein.
In some alternative embodiments, as shown in fig. 7, the anti-reflection circuit 2 includes: and a first diode DF1, wherein the anode of the first diode DF1 is connected with an external power supply, and the cathode of the first diode DF1 is connected with the second end of the first bias circuit 11. The anode of the first diode DF1 in fig. 7 is not directly connected to the external power source, but is connected to the external power source through the third filter circuit 33.
Specifically, as shown in fig. 7, when a signal is input to the front end of the vehicle microphone (the front end of the signal source MC 1+), the signal cannot flow through the first resistor R1 and the first diode DF1 due to the presence of the first diode DF1, so that unidirectional signal circulation is realized, and crosstalk between signals is prevented.
For example, in fig. 8, when there is a signal input at the MC1_p end, the signal at the MC1_p end does not flow into the MC2_p end through the first bias circuit 11 due to the anti-reflection circuit 2, so that noise between MICs is prevented from forming a crosstalk loop through the power supply.
In some alternative embodiments, as shown in fig. 6, the filter circuit includes: a first filter circuit 31 and a second filter circuit 32, wherein a first end of the first filter circuit 31 is connected to a first end of the second bias circuit 12 and a first end of the second filter circuit 32, and a second end of the first filter circuit 31 is connected to a first end of the first bias circuit 11 and a second end of the second filter circuit 32; the third terminal of the second filter circuit 32 is connected to the first terminal of the voltage divider circuit 4.
Specifically, the first filter circuit is used for improving the antistatic performance of the circuit, reducing the influence of static electricity, surge, overvoltage and the like on the circuit, and improving the signal to noise ratio; the second filter circuit is used for preventing the direct current signal to be processed from passing through.
In some alternative embodiments, as shown in fig. 7, the first filter circuit 31 includes: the first capacitor C4 and the second capacitor C5, wherein the first end of the first capacitor C4 is connected to the first end of the second bias circuit 12 and the first end of the second filter circuit 32, and the second end of the first capacitor C4 and the second end of the second capacitor C5 are grounded; the first end of the second capacitor C5 is connected to the first end of the first bias circuit 11 and the second end of the second filter circuit 32.
Specifically, as shown in fig. 7, the first capacitor C4 is used for filtering noise and surge signals at the negative end MC 1-end of the signal source, and the second capacitor C5 is used for filtering noise and surge signals at the positive end MC1+ end of the signal source.
It should be noted that, the capacitors in the first filter circuit are respectively used for filtering noise and surge signals at the negative end and the positive end of the signal source, and when there are multiple groups of signal sources, the number of the capacitors in the first filter circuit is correspondingly increased according to the actual application scenario.
In some alternative embodiments, as shown in fig. 7, the second filter circuit 32 includes: a third capacitor C6 and a fourth capacitor C7, wherein a first end of the third capacitor C6 is connected to the first end of the first filter circuit 31, and a second end of the third capacitor C6 is connected to the first end of the voltage divider circuit 4; and a first end of the fourth capacitor C7 is connected to the second end of the first filter circuit 31, and a second end of the fourth capacitor C is connected to the first end of the voltage divider circuit 4.
Specifically, as shown in fig. 7, the third capacitor C6 is used for preventing the direct current signal to be processed at the negative end MC 1-end of the signal source from passing through, and the fourth capacitor C7 is used for preventing the direct current signal to be processed at the positive end MC1+ end of the signal source from passing through.
It should be noted that, the capacitors in the second filter circuit are respectively used for preventing the direct current to-be-processed signals of the negative end and the positive end of the signal source from passing through, and when a plurality of groups of signal sources exist, the number of the capacitors in the second filter circuit is correspondingly increased according to the actual application scene.
In some alternative embodiments, as shown in fig. 6, the filtering circuit further includes: the first end of the third filter circuit 33 is connected to the external power source, and the second end is connected to the first end of the anti-reflection circuit 2.
Specifically, the third filter circuit is used for filtering noise of an external power supply, and avoiding the influence of power supply noise of the power supply on the signal to noise ratio of the vehicle-mounted microphone.
In some alternative embodiments, as shown in fig. 7, the third filter circuit 33 includes: the capacitor comprises an inductor L, a fifth capacitor C1, a sixth capacitor C2 and a seventh capacitor C3, wherein a first end of the inductor L is connected with an external power supply; the first end of the fifth capacitor C1 and the sixth capacitor C2 which are connected in parallel is connected with the second end of the inductor L, the first end of the seventh capacitor C3 and the first end of the anti-reflection circuit 2, and the second end of the fifth capacitor C1 and the sixth capacitor C2 which are connected in parallel is grounded; and the second end of the seventh capacitor C3 is grounded.
The third filter circuit 33 is not limited to the LC filter circuit shown in fig. 7, and may be a filter circuit such as an LLC filter circuit.
In some alternative embodiments, as shown in fig. 7, the voltage dividing circuit 4 includes: the first ends of the third resistor R3 and the fourth resistor R4 are respectively connected with the second ends of the third capacitor C6 and the fourth capacitor C7, and the second ends of the third resistor R3 and the fourth resistor R4 are signal output ends; and the first end of the fifth resistor R5 is connected with the second end of the fourth resistor R4, and the second end of the fifth resistor R5 is grounded.
Specifically, as shown in fig. 7, the third resistor R3 is used for limiting the voltage of the signal to be processed at the negative terminal MC 1-end of the signal source, and the fourth resistor R4 is used for limiting the voltage of the signal to be processed at the positive terminal MC1+ end of the signal source.
It should be noted that, the resistors in the voltage dividing circuit are respectively used for limiting the voltages of the signals to be processed at the negative end and the positive end of the signal source, and when a plurality of groups of signal sources exist, the number of the capacitors in the voltage dividing circuit is correspondingly increased according to the actual application scene.
In some alternative embodiments, as shown in fig. 7, the signal processing circuit further includes: and the ADC acquisition chip is connected with the second end of the voltage dividing circuit 4 and is used for acquiring signals output by the voltage dividing circuit 4.
For example, when the ADC acquisition chip needs to acquire signals of 4 signal sources, that is, acquire 4 signals of the vehicle-mounted microphone, 4 signal processing circuits need to be provided, and the connection manner of the 4 signal processing circuits is shown in fig. 8.
It should be noted that the number of signal sources may be set according to the actual application scenario as required, which is not limited herein. The acquisition method, the analog-to-digital conversion method and the like in the ADC acquisition chip are mature ADC acquisition methods in the prior art, and are not described in detail herein.
Although embodiments of the present utility model have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope of the utility model as defined by the appended claims.
Claims (11)
1. A signal processing circuit, comprising: a bias circuit, an anti-reflection circuit, a filter circuit and a voltage dividing circuit, wherein,
the first end of the bias circuit is connected with the signal source and the first end of the filter circuit and is used for supplying power to the signal source and providing a static working point;
the first end of the anti-reflection circuit is connected with an external power supply, and the second end of the anti-reflection circuit is connected with the second end of the bias circuit and is used for forming an anti-crosstalk loop between signals to be processed;
the second end of the filter circuit is connected with the first end of the voltage dividing circuit and is used for filtering the signal to be processed and preventing the direct current signal to be processed from passing through;
and the second end of the voltage dividing circuit is a signal output end and is used for limiting the voltage of the signal to be processed.
2. The signal processing circuit of claim 1, wherein the bias circuit comprises: a first bias circuit and a second bias circuit, wherein,
the first end of the first bias circuit is connected with the positive end of the signal source and the first end of the filter circuit, and the second end of the first bias circuit is connected with the second end of the anti-reflection circuit;
and the first end of the second bias circuit is connected with the negative end of the signal source, the first end of the filter circuit and the second end of the second bias circuit is grounded.
3. The signal processing circuit of claim 2, wherein the first bias circuit comprises a first resistor and the second bias circuit comprises a second resistor.
4. The signal processing circuit of claim 2, wherein the anti-reflection circuit comprises: a first diode, wherein,
and the anode of the first diode is connected with the external power supply, and the cathode of the first diode is connected with the second end of the first bias circuit.
5. The signal processing circuit of claim 2, wherein the filter circuit comprises: a first filter circuit and a second filter circuit, wherein,
the first end of the first filter circuit is connected with the first end of the second bias circuit and the first end of the second filter circuit, the second end of the first filter circuit is connected with the first end of the first bias circuit and the second end of the second filter circuit, and the third end of the first filter circuit is grounded;
and the third end of the second filter circuit is connected with the first end of the voltage dividing circuit.
6. The signal processing circuit of claim 5, wherein the first filter circuit comprises: a first capacitor and a second capacitor, wherein,
the first end of the first capacitor is connected with the first end of the second bias circuit and the first end of the second filter circuit, and the second end of the first capacitor is grounded with the second end of the second capacitor;
and the first end of the second capacitor is connected with the first end of the first bias circuit and the second end of the second filter circuit.
7. The signal processing circuit of claim 5, wherein the second filter circuit comprises: a third capacitor and a fourth capacitor, wherein,
the first end of the third capacitor is connected with the first end of the first filter circuit, and the second end of the third capacitor is connected with the first end of the voltage dividing circuit;
and the first end of the fourth capacitor is connected with the second end of the first filter circuit, and the second end of the fourth capacitor is connected with the first end of the voltage dividing circuit.
8. A signal processing circuit according to claim 3, wherein the filter circuit further comprises:
and the first end of the third filter circuit is connected with an external power supply, and the second end of the third filter circuit is connected with the first end of the anti-reflection circuit.
9. The signal processing circuit of claim 8, wherein the third filter circuit comprises: an inductor, a fifth capacitor, a sixth capacitor and a seventh capacitor, wherein,
the first end of the inductor is connected with an external power supply;
the first end of the fifth capacitor and the sixth capacitor which are connected in parallel are connected with the second end of the inductor, the first end of the seventh capacitor and the first end of the anti-reflection circuit, and the second end of the fifth capacitor and the sixth capacitor which are connected in parallel is grounded;
and the second end of the seventh capacitor is grounded.
10. The signal processing circuit of claim 7, wherein the voltage divider circuit comprises: a third resistor, a fourth resistor and a fifth resistor, wherein,
the first ends of the third resistor and the fourth resistor are respectively connected with the second ends of the third capacitor and the fourth capacitor, and the second ends of the third resistor and the fourth resistor are signal output ends;
and the first end of the fifth resistor is connected with the second end of the fourth resistor, and the second end of the fifth resistor is grounded.
11. The signal processing circuit of claim 1, further comprising:
and the acquisition chip is connected with the second end of the voltage dividing circuit and is used for acquiring signals output by the voltage dividing circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321339747.0U CN219678677U (en) | 2023-05-25 | 2023-05-25 | Signal processing circuit |
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|---|---|---|---|
| CN202321339747.0U CN219678677U (en) | 2023-05-25 | 2023-05-25 | Signal processing circuit |
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| CN219678677U true CN219678677U (en) | 2023-09-12 |
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