Audio processing circuit of telephone and telephone

Abstract

The present invention provides an audio processing circuit for a telephone and a telephone. The audio processing circuit of the telephone includes: a first microphone circuit electrically connected to a main control processor of the telephone, for collecting a first sound signal from a user; a receiver circuit electrically connected to the main control processor, for receiving a second sound signal from a user on the other end; a second microphone circuit electrically connected to the main control processor, for collecting an ambient noise signal of the telephone; the main control processor performs noise reduction processing on the first sound signal based on the ambient noise signal to obtain a first target signal; and a feedback circuit electrically connected to the receiver circuit, for performing noise reduction processing on the second sound signal received by the receiver circuit to obtain a second target signal. The present invention can achieve noise reduction of sound signals, effectively improve sound quality, and has a simple circuit, low cost, and good human-computer interaction effect.

Description

Technical Field

[0001] The present invention relates to the technical field of audio processing, and in particular to an audio processing circuit of a telephone and the telephone. Background Art

[0002] With the progress of society and the rapid development of various communication technologies, especially the recent progress of Internet technology, people's demand for intelligent real-time communication based on Internet technology is increasing. However, analog phones based on public telephone systems can only realize simple calls and cannot realize intelligent management functions based on the Internet. They have single functions, poor sound quality and human-computer interaction effects, and complex installation and wiring. They cannot meet people's demand for easy-to-use and powerful electronic products.

[0003] Disadvantages of the prior art 1:

[0004] 1. Single function, only simple call function;

[0005] 2. The installation and wiring are complicated and the cost is high;

[0006] 3. Fixed installation, not portable;

[0007] 4. Only simple case input is available, and human-computer interaction is poor;

[0008] 5. The sound quality is poor. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide an audio processing circuit for a telephone and a telephone, so as to solve the problems in the prior art that the products have single functions, poor sound quality and human-computer interaction effects, complicated installation and wiring, and cannot meet people's demand for the use of electronic products.

[0010] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0011] An audio processing circuit for a telephone, comprising:

[0012] a first microphone circuit electrically connected to the main control processor of the telephone, for collecting a first voice signal of the user;

[0013] a receiver circuit electrically connected to the main control processor, configured to receive a second sound signal from a peer user;

[0014] a second microphone circuit electrically connected to the main control processor, for collecting a telephone ambient noise signal;

[0015] The main control processor performs noise reduction processing on the first sound signal according to the environmental noise signal to obtain a first target signal, wherein the noise of the first target signal is lower than a first value;

[0016] The step-back circuit is electrically connected to the receiver circuit, and is used to perform noise reduction processing on the second sound signal received by the receiver circuit to obtain a second target signal, wherein the noise of the second target signal is lower than a second value.

[0017] Optionally, the second microphone circuit includes:

[0018] Regular level;

[0019] negative electrode;

[0020] a first chip diode, a first capacitor, a first resistor, and a microphone bias voltage circuit electrically connected to the positive terminal;

[0021] a second chip diode, a second resistor, a second capacitor and a second resistor electrically connected to the negative electrode;

[0022] a third capacitor connected between the positive electrode and the negative electrode;

[0023] The first SMD diode, the second SMD diode, the first capacitor and the second capacitor are grounded.

[0024] Optionally, the microphone bias voltage circuit MICBIAS includes:

[0025] a third resistor electrically connected to the positive terminal;

[0026] a fourth resistor electrically connected to the third resistor;

[0027] A fourth capacitor is connected between the third resistor and the fourth resistor, and the fourth capacitor is grounded.

[0028] Optionally, the step-back circuit includes: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a fifth capacitor, a sixth capacitor, a seventh capacitor, and an eighth capacitor;

[0029] The fifth resistor is electrically connected to the positive terminal of the receiver circuit;

[0030] The second end of the fifth resistor is electrically connected to the first end of the sixth resistor;

[0031] The first end of the seventh resistor is electrically connected to the second end of the fifth resistor and the first end of the sixth resistor;

[0032] The first end of the eighth resistor is electrically connected to the second end of the seventh resistor;

[0033] The first end of the fifth capacitor is electrically connected to the second end of the fifth resistor and the first end of the sixth resistor;

[0034] The first end of the sixth capacitor is electrically connected to the second end of the fifth capacitor;

[0035] The ninth resistor is electrically connected to the negative electrode of the receiver circuit;

[0036] The second end of the ninth resistor is electrically connected to the first end of the tenth resistor;

[0037] The second end of the eighth resistor is electrically connected to the second end of the ninth resistor and the first end of the tenth resistor;

[0038] The second end of the sixth capacitor is electrically connected to the second end of the ninth resistor and the first end of the tenth resistor;

[0039] The first end of the seventh capacitor is electrically connected to the second end of the sixth resistor;

[0040] The second end of the seventh capacitor is electrically connected to the first end of the eighth capacitor;

[0041] The second end of the eighth capacitor is electrically connected to the second end of the tenth resistor;

[0042] The seventh resistor, the eighth resistor, the fifth capacitor, the sixth capacitor, the seventh capacitor and the eighth capacitor are all grounded.

[0043] Optionally, the receiver circuit is electrically connected to a ground line of a codec CodeC.

[0044] Optionally, the second microphone circuit and the first microphone circuit are respectively located on two opposite surfaces of the main control processor.

[0045] Optionally, the main control processor performs noise reduction processing on the first sound signal, including:

[0046] The environmental noise signal in the first sound signal and the sound signal received by the step-back circuit are filtered out.

[0047] The present invention also provides a telephone, comprising: a main control processor; and the audio processing circuit as described above.

[0048] Optionally, the telephone further includes: at least one of the following electrically connected to the main control processor:

[0049] Wireless wifi bluetooth module;

[0050] Human-computer interaction module;

[0051] Power supply module;

[0052] Proximity sensor;

[0053] At least one external interface.

[0054] Optionally, the proximity sensor includes:

[0055] Processor chip; the processor chip has a VDD pin, an LEDA pin, an LEDK pin, an LDR pin, an INT pin, an SCL pin and an SDA pin;

[0056] an eleventh resistor electrically connected to the VDD pin;

[0057] a ninth capacitor and a tenth capacitor electrically connected to the first end of the eleventh resistor, wherein the ninth capacitor and the tenth capacitor are grounded;

[0058] an eleventh capacitor electrically connected to the VDD pin and the second end of the eleventh resistor, the eleventh capacitor being grounded;

[0059] The ninth capacitor is electrically connected to the LEDA pin;

[0060] a twelfth resistor electrically connected to the INT pin;

[0061] a thirteenth resistor electrically connected to the SCL pin;

[0062] a fourteenth resistor electrically connected to the SDA pin.

[0063] The above solution of the present invention includes at least the following beneficial effects:

[0064] The above-mentioned solution of the present invention uses a first microphone circuit electrically connected to the main control processor of the telephone to collect the first sound signal of the user; a receiver circuit electrically connected to the main control processor to receive the second sound signal from the opposite user; a second microphone circuit electrically connected to the main control processor to collect the ambient noise signal of the telephone; the main control processor performs noise reduction processing on the first sound signal according to the ambient noise signal to obtain a first target signal, and the noise of the first target signal is lower than a first value; a feedback circuit electrically connected to the receiver circuit is used to perform noise reduction processing on the second sound signal received by the receiver circuit to obtain a second target signal, and the noise of the second target signal is lower than a second value. The solution of the present invention uses the mature Internet as a transmission medium, with extremely low transmission costs, and adopts dual-microphone background noise reduction and high-quality voice encoding and decoding technology to effectively improve sound quality, and can provide users with a better human-computer interaction experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 is a circuit diagram of a first microphone circuit of the present invention;

[0066] Figure 2 is a circuit diagram of a receiver circuit of the present invention;

[0067] Figure 3 is a circuit diagram of a second microphone circuit of the present invention;

[0068] Figure 4 is a circuit diagram of a hardware step-back circuit for a speaker output of the present invention;

[0069] Figure 5 This is a schematic diagram of the connection between the main control processor and each module of the telephone of the present invention;

[0070] Figure 6 It is a circuit diagram of a proximity sensor of the present invention. DETAILED DESCRIPTION

[0071] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0072] like Figures 1 to 4 As shown, an embodiment of the present invention provides an audio processing circuit for a telephone, comprising:

[0073] A first microphone circuit electrically connected to the main control processor of the telephone is used to collect a first sound signal of the user; a receiver circuit electrically connected to the main control processor is used to receive a second sound signal from the opposite user; a second microphone circuit electrically connected to the main control processor is used to collect an ambient noise signal of the telephone; the main control processor performs noise reduction processing on the first sound signal according to the ambient noise signal to obtain a first target signal, and the noise of the first target signal is lower than a first value; a feedback circuit electrically connected to the receiver circuit is used to perform noise reduction processing on the second sound signal received by the receiver circuit to obtain a second target signal, and the noise of the second target signal is lower than a second value.

[0074] In this embodiment, the first microphone circuit collects a user's first sound signal, and the main control processor performs noise reduction processing on the first sound signal to obtain a first target signal. The receiver circuit receives a second sound signal from the other user, and the second microphone circuit collects the telephone's ambient noise signal. The feedback circuit performs noise reduction processing on the second sound signal to obtain a second target signal. By performing noise reduction processing on the collected and received sound signals, the sound quality is effectively improved, providing the user with a high-quality communication experience.

[0075] In an embodiment of the present invention, a main control processor is added on the basis of the traditional analog telephone interface. In addition to the above-mentioned first microphone circuit, second microphone circuit, receiver circuit, and feedback circuit, the main control processor is also electrically connected to: a WiFi Bluetooth module, a human-computer interaction module, a voice codec module, an audio processing module, an external interface module, a power supply module, a key processing module, an LCD display module, a touch module, an intelligent antenna system module, and a proximity sensor.

[0076] The main control processor has a high-performance codec CodeC, has rich external interfaces, and has optimized chip and system costs, with high cost performance.

[0077] The human-computer interaction module electrically connected to the main control processor includes: a large-size display screen, which can be 1.8 inches, for displaying various types of information; and rich matrix scanning function buttons to bring users a better human-computer interaction experience.

[0078] A WiFi Bluetooth module electrically connected to the main control processor and a smart antenna module used in conjunction with the WiFi Bluetooth module, the smart antenna module is used to send and receive wireless signals and exchange signals with the WiFi Bluetooth module, and the WiFi Bluetooth module exchanges signals between the wireless signals received and sent by the smart antenna module and the main control processor.

[0079] The power supply module, electrically connected to the main control processor, includes a power management chip and a lithium battery electrically connected to the power management chip. The lithium battery, combined with software and hardware low-power design, can extend standby time, eliminate traditional wired charging, and facilitate portability.

[0080] The external interface module electrically connected to the main control processor includes: USB-OTG, USB-HOST, UART, SPI, parallel port and other communication interfaces, which are used to interact with external devices for signals and can meet system needs.

[0081] The sensor module electrically connected to the main control processor includes: a proximity sensor and / or a temperature sensor.

[0082] The audio processing module electrically connected to the main control processor adopts dual-microphone background noise reduction, namely the above-mentioned first microphone circuit and second microphone circuit, wherein the first microphone circuit is used to collect the user's voice signal, and the second microphone circuit is used to collect the surrounding environment noise signal. In conjunction with the preset software algorithm, it can reduce the noise in the surrounding environment, effectively improve the sound quality, and bring high-quality auditory enjoyment to the user.

[0083] This adds battery and USB power to the phone, making it more portable and enabling wireless internet connectivity with low transmission costs and strong communication signals. The dual-microphone background noise reduction feature, comprising both the first and second microphone circuits, along with a high-performance audio processing chip, effectively improves sound quality, providing users with high-quality calls and a superior human-computer interaction experience.

[0084] Furthermore, in this embodiment, the main control processor performs noise reduction processing on the first sound signal, including:

[0085] The environmental noise signal in the first sound signal and the sound signal received by the step-back circuit are filtered out.

[0086] In an embodiment of the present invention, all sound signals received by the first microphone circuit (including useful call signals, signals emitted by its own speakers, and external interference noise signals) can be filtered and processed, and the sounds emitted by the speakers received by the hardware feedback circuit and the environmental noise signals received by the second microphone circuit can be filtered out, so that a clean speech signal can be obtained, thereby achieving the purpose of noise elimination.

[0087] The audio processing circuit of the telephone may further include: the second microphone circuit and the first microphone circuit are respectively located on two opposite sides of the main control processor, thereby minimizing the impact on the first microphone.

[0088] like Figure 1 As shown, in an optional embodiment of the present invention, the first microphone circuit is electrically connected to the main control processor. Since the first microphone circuit is used to collect the user's first voice signal and the second microphone circuit is used to collect the telephone's ambient noise signal, in order to prevent the first microphone circuit and the second microphone circuit from interfering with each other, the first microphone circuit and the second microphone circuit are respectively connected to different interface positions on the main control processor. This connection method ensures that the first microphone circuit and the second microphone circuit do not interfere with each other, and each performs its own function independently.

[0089] like Figure 2 As shown, in another optional embodiment of the present invention, the receiver circuit is electrically connected to the step-back circuit, and the second sound signal received by the receiver from the opposite user is subjected to noise reduction processing by the step-back circuit to obtain a second target signal. In this way, the user's communication quality can be effectively improved.

[0090] like Figure 3As shown, in another optional embodiment of the present invention, the second microphone circuit includes: a positive electrode; a negative electrode; a first patch diode ED6, a first capacitor C123, a first resistor R100 and a microphone bias voltage circuit electrically connected to the positive electrode; a second patch diode ED5, a second resistor R102, a second capacitor C122 and a second resistor R101 electrically connected to the negative electrode; a third capacitor C121 connected between the positive electrode and the negative electrode; the first patch diode ED6, the second patch diode ED5, the first capacitor C123 and the second capacitor C122 are grounded.

[0091] Specifically, the microphone bias voltage circuit MICBIAS includes: a third resistor R99 electrically connected to the positive terminal; a fourth resistor R98 electrically connected to the third resistor R99; and a fourth capacitor C120 connected between the third resistor R99 and the fourth resistor R98, wherein the fourth capacitor C120 is grounded.

[0092] In this embodiment, the second microphone circuit receives the ambient noise signal and performs noise reduction processing on the ambient noise signal by working with the main control processor, thereby effectively reducing noise and improving sound quality.

[0093] like Figure 4As shown, in another optional embodiment of the present invention, the step-back circuit includes: a fifth resistor R154, a sixth resistor R155, a seventh resistor R156, an eighth resistor R157, a ninth resistor R158, a tenth resistor R159, a fifth capacitor C168, a sixth capacitor C169, a seventh capacitor C170 and an eighth capacitor C171; the fifth resistor R154 is electrically connected to the positive pole of the receiver circuit; the second end of the fifth resistor R154 is electrically connected to the first end of the sixth resistor R155; the first end of the seventh resistor 156 is electrically connected to the second end of the fifth resistor R154 and the first end of the sixth resistor R155; the first end of the eighth resistor R157 is electrically connected to the second end of the seventh resistor R156; the first end of the fifth capacitor C168 is electrically connected to the second end of the fifth resistor R154 and the first end of the sixth resistor R155; the first end of the sixth capacitor C169 is electrically connected to the first end of the seventh resistor R171 The second end of the fifth capacitor C168 is electrically connected; the ninth resistor R158 is electrically connected to the negative electrode of the receiver circuit; the second end of the ninth resistor R158 is electrically connected to the first end of the tenth resistor R159; the second end of the eighth resistor 157 is electrically connected to the second end of the ninth resistor R158 and the first end of the tenth resistor R159; the second end of the sixth capacitor C169 is electrically connected to the second end of the ninth resistor R158 and the first end of the tenth resistor R159; the first end of the seventh capacitor C170 is electrically connected to the second end of the sixth resistor R155; the second end of the seventh capacitor C170 is electrically connected to the first end of the eighth capacitor C171; the second end of the eighth capacitor C171 is electrically connected to the second end of the tenth resistor R159; the seventh resistor R156, the eighth resistor R157, the fifth capacitor C168, the sixth capacitor C169, the seventh capacitor C170 and the eighth capacitor C171 are all grounded.

[0094] In this embodiment, the step-back circuit performs noise reduction processing on the voice signal of the opposite user received by the receiver circuit, so that the call quality of both users is significantly improved.

[0095] Furthermore, in an embodiment of the present invention, the receiver circuit is electrically connected to a ground line of a codec CodeC.

[0096] The solution of the present invention uses a large-capacity battery to power the phone, and wirelessly connects to external devices via WiFi and Bluetooth, making it easy to carry and exchange information. It can provide a large 1.8-inch LCD display and function buttons, providing users with good human-computer interaction effects. It has a high-performance CODED (codec) audio processing chip and adopts dual-microphone background noise reduction through a preset software algorithm, namely the first microphone circuit and the second microphone circuit, to eliminate surrounding environmental noise, improve the sound quality of both parties in the call, bring users the best audio-visual experience, and provide the most humanized functions.

[0097] like Figure 5 As shown, the present invention also provides a telephone, comprising: a main control processor; and the audio processing circuit as described above.

[0098] Furthermore, in this embodiment, the telephone may further include: at least one of the following items electrically connected to the main control processor: a wireless WiFi Bluetooth module; a human-computer interaction module; a power supply module; a proximity sensor; and at least one external interface.

[0099] like Figure 6 As shown, specifically, the proximity sensor includes:

[0100] Processor chip; the processor chip has a VDD pin, a LEDA pin, a LEDK pin, a LDR pin, an INT pin, an SCL pin and an SDA pin; an eleventh resistor R57 electrically connected to the VDD pin; a ninth capacitor C96 and a tenth capacitor C95 electrically connected to a first end of the eleventh resistor R57, the ninth capacitor C96 and the tenth capacitor C95 being grounded; an eleventh capacitor C94 electrically connected to the VDD pin and a second end of the eleventh resistor R57, the eleventh capacitor C94 being grounded; the ninth capacitor C96 being electrically connected to the LEDA pin; a twelfth resistor R56 electrically connected to the INT pin; a thirteenth resistor R55 electrically connected to the SCL pin; and a fourteenth resistor R54 electrically connected to the SDA pin.

[0101] It should be noted that the specific implementation methods of the wireless WiFi Bluetooth module, human-computer interaction module, and power supply module in the above embodiments are all applicable to this embodiment and can achieve the same technical effects.

[0102] In the above-mentioned embodiment of the present invention, the first microphone and the second microphone are respectively provided to collect corresponding sound signals, and the noise reduction processing of the telephone environment noise received by the receiver circuit is performed through the back-stepping circuit, so that the telephone can eliminate noise and achieve a better sound quality experience. At the same time, the telephone described in the embodiment of the present invention has extremely low transmission costs and can get rid of the costs brought by traditional telephone networks, including dedicated telephone lines, telephone networks, and management costs; the telephone provides rich functions, with an intelligent LCD display and multi-function buttons, which can provide a better human-computer interaction experience; through wireless communication and battery power supply, mobile calls can be made anywhere.

[0103] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An audio processing circuit for a telephone, characterized in that: include: a first microphone circuit electrically connected to the main control processor of the telephone, for collecting a first voice signal of the user; a receiver circuit electrically connected to the main control processor, configured to receive a second sound signal from a peer user; a second microphone circuit electrically connected to the main control processor, for collecting a telephone ambient noise signal; The main control processor performs noise reduction processing on the first sound signal according to the environmental noise signal to obtain a first target signal, wherein the noise of the first target signal is lower than a first value; a step-back circuit electrically connected to the receiver circuit, configured to perform noise reduction processing on a second sound signal received by the receiver circuit to obtain a second target signal, wherein the noise of the second target signal is lower than a second value; The second microphone circuit includes: Regular level; negative electrode; A first chip diode (ED6), a first capacitor (C123), a first resistor (R100) and a microphone bias voltage circuit electrically connected to the positive terminal; a second chip diode (ED5), a second resistor (R102), a second capacitor (C122), and a fifteenth resistor (R101) electrically connected to the negative electrode; a third capacitor (C121) connected between the positive and negative electrodes; The first chip diode (ED6), the second chip diode (ED5), the first capacitor (C123) and the second capacitor (C122) are grounded; The microphone bias voltage circuit MICBIAS comprises: a third resistor (R99) electrically connected to the positive terminal; a fourth resistor (R98) electrically connected to the third resistor (R99); a fourth capacitor (C120) connected between the third resistor (R99) and the fourth resistor (R98), the fourth capacitor (C120) being grounded; A WiFi Bluetooth module electrically connected to the main control processor and a smart antenna module used in conjunction with the WiFi Bluetooth module, the smart antenna module being used to transmit and receive wireless signals and perform signal interaction with the WiFi Bluetooth module, and the WiFi Bluetooth module performing signal interaction between the wireless signals received and transmitted by the smart antenna module and the main control processor; The step-back circuit includes: a fifth resistor (R154), a sixth resistor (R155), a seventh resistor (R156), an eighth resistor (R157), a ninth resistor (R158), a tenth resistor (R159), a fifth capacitor (C168), a sixth capacitor (C169), a seventh capacitor (C170), and an eighth capacitor (C171); The fifth resistor (R154) is electrically connected to the positive terminal of the receiver circuit; The second end of the fifth resistor (R154) is electrically connected to the first end of the sixth resistor (R155); The first end of the seventh resistor (R156) is electrically connected to the second end of the fifth resistor (R154) and the first end of the sixth resistor (R155); The first end of the eighth resistor (R157) is electrically connected to the second end of the seventh resistor (R156); The first end of the fifth capacitor (C168) is electrically connected to the second end of the fifth resistor (R154) and the first end of the sixth resistor (R155); The first end of the sixth capacitor (C169) is electrically connected to the second end of the fifth capacitor (C168); The ninth resistor (R158) is electrically connected to the negative electrode of the receiver circuit; The second end of the ninth resistor (R158) is electrically connected to the first end of the tenth resistor (R159); The second end of the eighth resistor (R157) is electrically connected to the second end of the ninth resistor (R158) and the first end of the tenth resistor (R159); The second end of the sixth capacitor (C169) is electrically connected to the second end of the ninth resistor (R158) and the first end of the tenth resistor (R159); The first end of the seventh capacitor (C170) is electrically connected to the second end of the sixth resistor (R155); The second end of the seventh capacitor (C170) is electrically connected to the first end of the eighth capacitor (C171); The second end of the eighth capacitor (C171) is electrically connected to the second end of the tenth resistor (R159); The seventh resistor (R156), the eighth resistor (R157), the fifth capacitor (C168), the sixth capacitor (C169), the seventh capacitor (C170) and the eighth capacitor (C171) are all grounded; The receiver circuit is electrically connected to the ground line of the codec CodeC; The second microphone circuit and the first microphone circuit are respectively located on two opposite surfaces of the main control processor; the first microphone circuit and the second microphone circuit are respectively connected to different interface positions of the main control processor; The main control processor performs noise reduction processing on the first sound signal, including: The environmental noise signal in the first sound signal and the sound signal received by the step-back circuit are filtered out.

2. A telephone, characterized in that: include: Main control processor; And the audio processing circuit as claimed in claim 1.

3. The telephone according to claim 2, wherein: The invention also includes: at least one of the following items electrically connected to the main control processor: Wireless wifi bluetooth module; Human-computer interaction module; Power supply module; Proximity sensor; At least one external interface.

4. The telephone according to claim 3, wherein: The proximity sensor comprises: Processor chip; the processor chip has a VDD pin, an LEDA pin, an LEDK pin, an LDR pin, an INT pin, an SCL pin and an SDA pin; an eleventh resistor (R57) electrically connected to the VDD pin; a ninth capacitor (C96) and a tenth capacitor (C95) electrically connected to the first end of the eleventh resistor (R57), the ninth capacitor (C96) and the tenth capacitor (C95) being grounded; an eleventh capacitor (C94) electrically connected to the VDD pin and the second end of the eleventh resistor (R57), the eleventh capacitor (C94) being grounded; The ninth capacitor (C96) is electrically connected to the LEDA pin; a twelfth resistor (R56) electrically connected to the INT pin; a thirteenth resistor (R55) electrically connected to the SCL pin; A fourteenth resistor (R54) is electrically connected to the SDA pin.

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