CN216391421U - Speaker in-place automatic detection circuit and vehicle-mounted communication box - Google Patents
Speaker in-place automatic detection circuit and vehicle-mounted communication box Download PDFInfo
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- CN216391421U CN216391421U CN202123339669.8U CN202123339669U CN216391421U CN 216391421 U CN216391421 U CN 216391421U CN 202123339669 U CN202123339669 U CN 202123339669U CN 216391421 U CN216391421 U CN 216391421U
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Abstract
The utility model discloses an in-place automatic detection circuit for a loudspeaker and a vehicle-mounted communication box, and relates to the field of vehicle-mounted communication boxes. The detection circuit includes: the audio power amplifier, the micro control unit, the first voltage division circuit and the loudspeaker interface; the audio power amplifier is respectively connected with the first voltage division circuit and the loudspeaker interface; the loudspeaker interface is used for externally connecting a loudspeaker; the micro control unit is respectively connected with the audio power amplifier and the first voltage division circuit and used for outputting a detection signal to be transmitted to the audio power amplifier, and determining an ADC value according to the change of a voltage division value fed back by the first voltage division circuit, so that the on-position and off-position automatic detection of the loudspeaker is realized. The embodiment of the utility model can automatically detect whether the SPK is in place or not in place when the SPK is externally connected to the T-BOX device, does not influence the communication quality of the SPK, and can solve the problem that the working stability and reliability of the T-BOX are influenced because the SPK cannot be effectively distinguished by the conventional SPK circuit scheme used when the T-BOX is externally connected with the SPK.
Description
Technical Field
The utility model relates to the field of vehicle-mounted communication boxes, in particular to an in-place automatic detection circuit of a loudspeaker and a vehicle-mounted communication box.
Background
T-BOX (Telematics BOX), mainly used for the interconnection and communication with the backstage system or mobile phone APP, obtain the vehicle information through the mobile phone or backstage. The T-BOX is connected with the automobile through the CAN bus to acquire automobile bus data, and the automobile owner CAN acquire the automobile state on the mobile phone APP.
At present, when a T-BOX product is externally connected with an SPK (speaker), an SPK (speaker) circuit is generally used for driving the SPK to work, and whether the SPK is in place or not is important for the working state of the SPK circuit when the SPK circuit works. However, the SPK circuit scheme used by the conventional T-BOX may fail in some special occasions, so that the SPK is in place or not in place, the SPK call quality is influenced, even the working stability and reliability of the T-BOX are influenced, the requirements of a vehicle on the reliability and stability of a T-BOX product cannot be met, and the user experience is influenced.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model aims to provide an in-place automatic detection circuit of a loudspeaker and a vehicle-mounted communication BOX, and aims to solve the problem that the working stability and reliability of the T-BOX are influenced because whether an SPK is in place or not cannot be effectively distinguished by the conventional SPK circuit scheme used when the T-BOX is externally connected with an SPK.
In order to solve the above technical problems, embodiments of the present invention provide the following technical solutions: a speaker automatic detection circuit in place, the speaker automatic detection circuit in place comprising: the audio power amplifier, the micro control unit, the first voltage division circuit and the loudspeaker interface; wherein:
the audio power amplifier is respectively connected with the first voltage division circuit and the loudspeaker interface;
the loudspeaker interface is used for externally connecting a loudspeaker;
the micro control unit is respectively connected with the audio power amplifier and the first voltage division circuit and used for outputting a detection signal to be transmitted to the audio power amplifier, and determining an ADC value according to the change of a voltage division value fed back by the first voltage division circuit, so that the on-position and off-position automatic detection of the loudspeaker is realized.
Optionally, the audio power amplifier comprises a first pin and a second pin; the first pin is connected with the first voltage division circuit and is also connected to a first port of the loudspeaker interface; the second pin is connected with the micro control unit and is also connected to the second port of the loudspeaker interface.
Optionally, the micro control unit includes a GPIO pin and an ADC pin; the GPIO pin is used for outputting a detection signal to a second pin of the audio power amplifier, and the ADC pin is used for receiving the change of the voltage division value fed back by the first voltage division circuit so as to determine the ADC value.
Optionally, the first voltage dividing circuit comprises a third resistor and a fourth resistor connected in series; one end of the third resistor is connected to the first pin of the audio power amplifier, the other end of the third resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is grounded; the connection point of the third resistor and the fourth resistor is the output end of the first voltage division circuit, and the change of the output voltage division value is fed back to the micro control unit.
Optionally, the micro control unit is further configured to determine an ADC value according to the received divided voltage value, and determine whether the obtained ADC value is within a preset speaker in-place judgment range, so as to implement automatic detection of whether a speaker is in-place or not in-place, including:
if the obtained ADC value is not in the set judgment loudspeaker in-place range, the loudspeaker is determined not to be in place, and the detection that the loudspeaker is not in place is realized; alternatively, the first and second electrodes may be,
if the obtained ADC value is within the set judgment loudspeaker in-place range, the loudspeaker can be determined to be in place, and the loudspeaker in-place detection is realized.
Optionally, the detection circuit further includes a second voltage divider circuit, where the second voltage divider circuit is connected to the micro control unit and the audio power amplifier, and is configured to receive the detection signal transmitted by the micro control unit and transmit the detection signal to the audio power amplifier.
Optionally, the second voltage dividing circuit comprises a first resistor and a second resistor connected in series; one end of the first resistor is connected to a second pin of the audio power amplifier, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is grounded; and the connection point of the first resistor and the second resistor is the input end of the second voltage division circuit, is connected to the GPIO pin of the micro control unit, receives the detection signal output by the GPIO pin of the micro control unit, and transmits the detection signal to the second pin of the audio power amplifier through the first resistor.
In order to solve the above technical problems, embodiments of the present invention further provide the following technical solutions: a vehicle-mounted communication box comprises the loudspeaker in-place automatic detection circuit in any embodiment of the utility model.
Compared with the prior art, the speaker in-place automatic detection circuit and the vehicle-mounted communication box provided by the embodiment of the utility model have the advantages that the GPIO pin connected with the micro control unit is configured to output the detection signal to the audio power amplifier, the audio power amplifier outputs the voltage division signal to the first voltage division circuit according to the detection signal, and the first voltage division circuit outputs different voltage division values to be fed back to the micro control unit, so that the micro control unit can obtain different ADC values when the speaker SPK is in place or not in place, and the automatic detection of the SPK in place or not in place is realized. Therefore, the SPK on-position and off-position detection can be automatically carried out when the SPK is externally connected to the T-BOX device, the SPK call quality is not influenced, and the problem that the working stability and reliability of the T-BOX are influenced because whether the SPK is on-position or not can not be effectively distinguished by the conventional SPK circuit scheme used when the T-BOX is externally connected to the SPK can be solved.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a schematic structural diagram of an automatic speaker in-place detection circuit according to the present invention;
FIG. 2 is a detailed structure diagram of an automatic speaker in-place detection circuit according to the present invention;
fig. 3 is a schematic structural diagram of a vehicle-mounted communication box according to the present invention.
Detailed Description
In order to facilitate an understanding of the utility model, the utility model is described in more detail below with reference to the accompanying drawings and specific examples. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. As used in this specification, the terms "upper," "lower," "inner," "outer," "bottom," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the utility model and simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all 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. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Furthermore, the technical features mentioned in the different embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other.
T-BOX (Telematics BOX), mainly used for the interconnection and communication with the backstage system or mobile phone APP, obtain the vehicle information through the mobile phone or backstage. The T-BOX is connected with an automobile through a CAN bus to acquire automobile bus data, the automobile is positioned through a GPS module, and the data is transmitted to a cloud server through a network by using the module. The vehicle owner can obtain the vehicle state on the mobile phone APP; an airbag condition; vehicle anti-theft alarm; inquiring the parking position of the vehicle; driving log: inquiring time, mileage, residual oil quantity and the like; and (4) analyzing the driving behavior, reporting the control result, the state and the like to a background, and pushing the execution result to a mobile phone APP or a website by a background server. Because the T-BOX has so many functions, it is an indispensable choice for both users and yards: for the car owner, the car owner does not worry about that the car cannot be found in a car yard, and an air bag, emergency rescue and the like are triggered when the car collides; for a car factory, the full life cycle management of the car is really realized, so that the car becomes a new generation of mobile terminal.
At present, when a T-BOX product is externally connected with an SPK (speaker), an SPK (speaker) circuit is generally used for driving the SPK to work, and whether the SPK is in place or not is important for the working state of the SPK circuit when the SPK circuit works. However, the SPK circuit scheme used by the conventional T-BOX may fail in some special occasions, so that the SPK is in place or not in place, the SPK call quality is influenced, even the working stability and reliability of the T-BOX are influenced, the requirements of a vehicle on the reliability and stability of a T-BOX product cannot be met, and the user experience is influenced.
In view of this, the present invention is directed to a novel speaker in-place automatic detection circuit, wherein a GPIO pin connected to a Micro Control Unit (MCU) is configured to output a detection signal to an audio power amplifier, the audio power amplifier outputs a voltage division signal to a first voltage division circuit according to the detection signal, and the first voltage division circuit outputs different voltage division values to be fed back to a micro control Unit, so that the micro control Unit can obtain different ADC (Analog-to-Digital Converter) values when a speaker SPK is in place and not in place, thereby implementing automatic detection of the SPK in place and not in place. Therefore, the SPK on-site detection can be automatically carried out when the SPK is externally connected to the T-BOX device, the SPK call quality is not influenced, and the problem that the working stability and reliability of the T-BOX are influenced because the SPK on-site cannot be effectively distinguished by the conventional SPK circuit scheme used when the SPK is externally connected to the T-BOX device can be solved.
In order to facilitate understanding of the above inventive concept, the above inventive concept will be described in more detail below with reference to the accompanying drawings and specific embodiments.
In one embodiment, as shown in fig. 1, the present invention provides a circuit for automatically detecting the presence of a speaker, where the circuit 1 for automatically detecting the presence of a speaker includes: an audio power amplifier 11, a micro control unit 12, a first voltage division circuit 13 and a speaker interface 15; wherein:
the audio power amplifier 11 is respectively connected with the first voltage division circuit 13 and the loudspeaker interface 15;
the speaker interface 15 is used for externally connecting a speaker;
the micro control unit 12 is connected to the audio power amplifier 11 and the first voltage dividing circuit 13, and is configured to output a detection signal GPIO to transmit to the audio power amplifier 11, and determine an ADC value according to a voltage dividing value change SPK _ P _ DET fed back by the first voltage dividing circuit 13, so as to implement automatic detection of presence and absence of the speaker.
In this embodiment, the GPIO pin connected to the micro control unit is configured to output a detection signal to the audio power amplifier, the audio power amplifier outputs a divided voltage signal to the first voltage dividing circuit according to the detection signal, and the first voltage dividing circuit outputs different divided voltage values to the micro control unit, so that the micro control unit can obtain different ADC values when the speaker SPK is in place or not in place, thereby implementing automatic detection of the presence or absence of the SPK. Therefore, the SPK on-position and off-position detection can be automatically carried out when the SPK is externally connected to the T-BOX device, the SPK call quality is not influenced, and the problem that the working stability and reliability of the T-BOX are influenced because whether the SPK is on-position or not can not be effectively distinguished by the conventional SPK circuit scheme used when the T-BOX is externally connected to the SPK can be solved.
In one embodiment, as shown in fig. 1 and fig. 2, the audio power amplifier 11 is configured to detect whether a speaker is externally connected to the speaker interface 15 according to the received detection signal GPIO, and output a voltage division signal to the first voltage division circuit 13.
Specifically, the audio power amplifier 11 includes a first pin SPK _ P and a second pin SPK _ N; wherein:
the first pin SPK _ P is connected to the first voltage dividing circuit 13, outputs a voltage dividing signal to the first voltage dividing circuit 13, and is connected to a first port of the speaker interface 15;
the second pin SPK _ N is connected to the micro control unit 12, and the received detection signal GPIO is also connected to a second port of the speaker interface 15.
In one embodiment, as shown in fig. 1 and 2, the micro control unit 12 includes a GPIO pin and an ADC pin; the GPIO pin is used to output the detection signal GPIO to the second pin SPK _ N of the audio power amplifier 11. The ADC pin is used to receive the voltage dividing value change SPK _ P _ DET fed back by the first voltage dividing circuit 13 to determine the ADC value.
In one embodiment, the first voltage dividing circuit 13 is configured to output different voltage dividing value changes SPK _ P _ DET according to whether the speaker interface 15 receiving the output of the audio power amplifier is externally connected with a voltage dividing signal of a speaker, and feed back the voltage dividing value changes SPK _ P _ DET to the micro control unit 2.
Specifically, as shown in fig. 2, the first voltage dividing circuit 13 includes a third resistor R3 and a fourth resistor R4 connected in series; one end of the third resistor R3 is connected to the first pin SPK _ P of the audio power amplifier 11, the other end is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is grounded; the connection point d between the third resistor R3 and the fourth resistor R4 is the output end of the first voltage divider circuit 13, and the output voltage division value SPK _ P _ DET is fed back to the ADC pin of the mcu 2.
Further, the micro control unit 12 is further configured to determine an ADC value according to the received change of the divided voltage value, and determine whether the obtained ADC value is within a preset speaker on-position determination range, so as to implement automatic detection of on-position and off-position of a speaker. The method specifically comprises the following steps:
if the obtained ADC value is not in the set judgment loudspeaker in-place range, the loudspeaker is determined not to be in place, and the detection that the loudspeaker is not in place is realized; alternatively, the first and second electrodes may be,
if the obtained ADC value is within the set judgment loudspeaker in-place range, the loudspeaker can be determined to be in place, and the loudspeaker in-place detection is realized.
In one embodiment, as shown in fig. 2, the detection circuit 1 further includes a second voltage dividing circuit 14, where the second voltage dividing circuit 14 is connected to the micro control unit 12 and the audio power amplifier 11, and is configured to receive the detection signal GPIO transmitted by the micro control unit 2 and transmit the detection signal GPIO to the audio power amplifier 11.
Specifically, the second voltage dividing circuit 14 includes a first resistor R1 and a second resistor R2 connected in series; one end of the first resistor R1 is connected to the second pin SPK _ N of the audio power amplifier 11, the other end is connected to one end of the second resistor R2, and the other end of the second resistor R2 is grounded; the connection point a of the first resistor R1 and the second resistor R2 is an input end of the second voltage divider circuit 14, is connected to the GPIO pin of the micro control unit 12, receives the detection signal GPIO output by the GPIO pin of the micro control unit 12, and transmits the detection signal GPIO to the second pin SPK _ N of the audio power amplifier 11 through the first resistor R1.
The utility model provides a loudspeaker in-place automatic detection circuit 1, which can realize the following functions in specific work:
function A: automatic detection that the SPK is not in place;
function B: automatic detection of SPK in place.
The function A is specifically realized as follows:
as shown in fig. 2, the default configuration of connection point a is pulled high, and when SPK is not in place, the voltage Vb at connection point b is equal to the voltage Va at connection point a: vb is Va. At this time, SPK is not connected, the speaker interface 15 is not connected to SPK, the connection point b and the connection point c are disconnected, the voltage Vc of the connection point c is 0V, and the voltage Vd of the connection point d is: vd ═ Vc × R4/(R3+ R4) ═ 0V, that is, the output voltage division value change SPK _ P _ DET is 0V, and the value is fed back to the ADC pin of the micro control unit 2 to obtain an ADC value of 0, and the ADC value is not in the set judgment speaker on-site range, and it can be determined that SPK is not on-site, and off-site detection is realized. The normal operation of the circuit can be realized by adjusting the resistance parameters of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4.
The function B is specifically realized as follows:
as shown in fig. 1, the default configuration of connection point a is pulled high, when SPK is in place, SPK is connected in the line, and SPK typically has an impedance of about 4 ohms, which is negligible and can be considered to be equivalent to one wire. At this time, the connection point b is connected to the connection point c, the voltage Vb at the connection point b is equal to the voltage Vc at the connection point c, that is, Vc equals Vb, and the voltage Vd at the connection point d is: vd ═ Va (R3+ R4)/(R1+ R3+ R4) V. Namely, the output voltage division value SPK _ P _ DET is changed into Vd, and the Vd is fed back to an ADC pin of the micro control unit 2 to obtain an ADC value, and the ADC value can be confirmed to be in place SPK in the set judgment loudspeaker in-place range, so that in-place detection is realized. The normal operation of the circuit can be realized by adjusting the resistance parameters of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4.
The utility model provides an in-place automatic detection circuit of a loudspeaker, which is characterized in that a GPIO pin connected with a micro control unit is configured to output a detection signal to an audio power amplifier, the audio power amplifier outputs a voltage division signal to a first voltage division circuit according to the detection signal, and the first voltage division circuit outputs different voltage division values to be fed back to the micro control unit, so that the micro control unit can obtain different ADC values when the SPK of the loudspeaker is in place or not in place, and the automatic detection of the SPK in place or not in place is realized. Therefore, the SPK on-position and off-position detection can be automatically carried out when the SPK is externally connected to the T-BOX device, and the communication quality of the SPK is not influenced. The speaker in-place automatic detection circuit is particularly suitable for in-place automatic detection application when the T-BOX is externally connected with an SPK, and particularly the application that the used audio PA (audio Power amplifier) is a D-type audio Power amplifier. Because the class-D audio power amplifier is usually provided with direct-current voltage bias, the SPK on-site can not be effectively detected, and a detection circuit configured by the class-D audio power amplifier is complex and has high cost; the detection circuit can greatly reduce the cost, can effectively detect whether the SPK is in place or not in place, and does not influence the communication quality of the SPK; and the parameters in the detection circuit can be configured in a hardware mode, so that different parameter requirements can be met, the requirements of reliability and stability of a vehicle-mounted T-BOX product can be met, and the detection circuit can be widely applied to industrial production.
Based on the same concept, in one embodiment, as shown in fig. 3, the utility model provides a vehicle-mounted communication box, which includes the automatic speaker presence detection circuit 1 according to any one of the above embodiments.
In this embodiment, the speaker in-place automatic detection circuit 1 is the same as the speaker in-place automatic detection circuit 1 described in any embodiment, and the specific structure and function may refer to the speaker in-place automatic detection circuit 1 described in any embodiment, which is not described herein again.
In this embodiment, the vehicle-mounted communication box includes a speaker in-place automatic detection circuit, and configures a GPIO pin connected to the micro control unit to output a detection signal to the audio power amplifier, and the audio power amplifier outputs a voltage division signal to the first voltage division circuit according to the detection signal, and the first voltage division circuit outputs different voltage division values to be fed back to the micro control unit, so that the micro control unit can obtain different ADC values when the speaker SPK is in place or not in place, thereby implementing the in-place and non-place automatic detection of the SPK. Therefore, the SPK on-position and off-position detection can be automatically carried out when the SPK is externally connected to the T-BOX device, the SPK call quality is not influenced, and the problem that the working stability and reliability of the T-BOX are influenced because whether the SPK is on-position or not can not be effectively distinguished by the conventional SPK circuit scheme used when the T-BOX is externally connected to the SPK can be solved.
It should be noted that the above-mentioned embodiment of the vehicle-mounted communication box and the embodiment of the speaker in-place automatic detection circuit belong to the same concept, and the specific implementation process thereof is described in detail in the embodiment of the speaker in-place automatic detection circuit, and the technical features in the embodiment of the speaker in-place automatic detection circuit are applicable in the embodiment of the vehicle-mounted communication box, and are not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the utility model, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the utility model as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. An automatic speaker in-place detection circuit, comprising: the audio power amplifier, the micro control unit, the first voltage division circuit and the loudspeaker interface; wherein:
the audio power amplifier is respectively connected with the first voltage division circuit and the loudspeaker interface;
the loudspeaker interface is used for externally connecting a loudspeaker;
the micro control unit is respectively connected with the audio power amplifier and the first voltage division circuit and used for outputting a detection signal to be transmitted to the audio power amplifier, and determining an ADC value according to the change of a voltage division value fed back by the first voltage division circuit, so that the on-position and off-position automatic detection of the loudspeaker is realized.
2. The detection circuit of claim 1, wherein the audio power amplifier comprises a first pin and a second pin; the first pin is connected with the first voltage division circuit and is also connected to a first port of the loudspeaker interface; the second pin is connected with the micro control unit and is also connected to the second port of the loudspeaker interface.
3. The detection circuit of claim 2, wherein the micro control unit comprises a GPIO pin and an ADC pin; the GPIO pin is used for outputting a detection signal to a second pin of the audio power amplifier, and the ADC pin is used for receiving the change of the voltage division value fed back by the first voltage division circuit so as to determine the ADC value.
4. The detection circuit of claim 2, wherein the first voltage divider circuit comprises a third resistor and a fourth resistor connected in series; one end of the third resistor is connected to the first pin of the audio power amplifier, the other end of the third resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is grounded; the connection point of the third resistor and the fourth resistor is the output end of the first voltage division circuit, and the change of the output voltage division value is fed back to the micro control unit.
5. The detection circuit according to claim 1, wherein the micro control unit is further configured to determine an ADC value according to the received divided voltage value, and determine whether the obtained ADC value is within a preset speaker presence range, so as to implement automatic detection of presence and absence of a speaker, including:
if the obtained ADC value is not in the set judgment loudspeaker in-place range, the loudspeaker is determined not to be in place, and the detection that the loudspeaker is not in place is realized; alternatively, the first and second electrodes may be,
if the obtained ADC value is within the set judgment loudspeaker in-place range, the loudspeaker can be determined to be in place, and the loudspeaker in-place detection is realized.
6. The detection circuit according to claim 3, further comprising a second voltage divider circuit, connected to the micro control unit and the audio power amplifier, for receiving the detection signal transmitted from the micro control unit and transmitting the detection signal to the audio power amplifier.
7. The detection circuit of claim 6, wherein the second voltage divider circuit comprises a first resistor and a second resistor connected in series; one end of the first resistor is connected to a second pin of the audio power amplifier, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is grounded; and the connection point of the first resistor and the second resistor is the input end of the second voltage division circuit, is connected to the GPIO pin of the micro control unit, receives the detection signal output by the GPIO pin of the micro control unit, and transmits the detection signal to the second pin of the audio power amplifier through the first resistor.
8. An in-vehicle communication box, characterized in that the in-vehicle communication box comprises the automatic detection circuit for the presence of the loudspeaker according to any one of the preceding claims 1 to 7.
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Address after: 518000 606, block a, sharing building, No. 78, Keyuan North Road, songpingshan community, Xili street, Nanshan District, Shenzhen, Guangdong Patentee after: Gosuncn IOT Technology Co.,Ltd. Address before: 518000 606, block a, sharing building, No. 78, Keyuan North Road, songpingshan community, Xili street, Nanshan District, Shenzhen, Guangdong Patentee before: Gaoxing Wulian Technology Co.,Ltd. |
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