3.5 mm audio interface identification monitoring system and method based on impedance and signal detection

Abstract

The invention discloses a 3.5 mm audio interface identification monitoring system and method based on impedance and signal detection. The invention discloses a 3.5 mm audio interface identification monitoring method based on impedance and signal detection. The method comprises the following steps: S1, equipment insertion detection: detecting that equipment is inserted into a 3.5 mm audio interface; s2, a device type identification step: measuring direct current impedance of a left sound channel and a right sound channel of the interface to the common ground, and judging the type of the inserted device according to the numerical range of the direct current impedance; and S3, a signal state monitoring step: in an audio playing state, sampling audio signals on the left and right sound channels, and judging an audio output state according to a sampling result. The 3.5 mm audio interface identification monitoring system and method based on impedance and signal detection have the beneficial effects that impedance detection and signal analysis are combined to form multi-mode monitoring, and the type identification and real-time signal state diagnosis capabilities of 3.5 mm audio interface connection equipment are improved.

Description

Technical Field

[0001] This invention belongs to the field of audio interface detection, specifically relating to a 3.5mm audio interface identification and monitoring system based on impedance and signal detection and a 3.5mm audio interface identification and monitoring method based on impedance and signal detection. Background Technology

[0002] The patent, with publication number CN104754461A and subject title "An Invention Patent for a Matching Headphone Identification Method, Device, and Electronic Device," and IPC classification number H04R3 / 00, discloses that "an electronic device includes an electrical parameter detection circuit, and when a four-segment headphone is inserted into the electronic device, the input terminal of the electrical parameter detection circuit is connected to the MIC pin of the MIC channel of the four-segment headphone. The method includes: when a four-segment headphone is detected inserted into the electronic device, inputting zero potential to the left channel pin and right channel pin of the four-segment headphone; driving the electrical parameter detection circuit to detect the electrical parameter value on the MIC pin; when the electrical parameter value meets a preset condition, determining that the four-segment headphone is a matched headphone, otherwise determining that the four-segment headphone is an unmatched headphone."

[0003] Therefore, the above-mentioned invention patents have disclosed one of the technical solutions for matching headphone identification methods, devices, and electronic devices. However, the technical solutions disclosed in these invention patents focus on headphone detection and do not further address issues such as significantly improving device type identification capabilities, thus requiring further improvement. Summary of the Invention

[0004] In view of the current situation of the prior art and to overcome the above-mentioned defects, the present invention provides a 3.5mm audio interface identification and monitoring system based on impedance and signal detection and a 3.5mm audio interface identification and monitoring method based on impedance and signal detection.

[0005] This invention employs the following technical solution: a 3.5mm audio interface identification and monitoring method based on impedance and signal detection, comprising the following steps: Step S1, Device Insertion Detection Step: A device is detected inserted into the 3.5mm audio interface; Step S2, Device Type Identification Step: Measure the DC impedance of the left channel to common ground and the right channel to common ground of the interface, and determine the type of the inserted device based on the range of DC impedance values. Step S3, Signal Status Monitoring Step: In audio playback mode, sample the audio signals on the left and right channels, and determine the audio output status based on the sampling results.

[0006] As a preferred technical solution to the above technical solutions, in step S2, determining the type of the inserted device includes: When the DC impedance is greater than the first preset threshold, the inserted device is determined to be a wire or a faulty device. When the DC impedance is within the typical headphone impedance range, the inserted device is determined to be a headphone; When the DC impedance is less than the second preset threshold, the inserted device is determined to be a passive speaker; When the DC impedance is higher than the typical headphone impedance range, the inserted device is determined to be an active speaker.

[0007] As a preferred technical solution to the above technical solutions, step S3, determining the audio output status includes: When valid audio signals are detected in both left and right channels, the stereo playback is considered to be normal. When only the left channel or only the right channel detects a valid audio signal, it is determined that the right channel or the left channel is abnormal. When no valid audio signal is detected in either the left or right channel, it is determined to be a silent fault.

[0008] As a preferred technical solution to the above technical solutions, the 3.5mm audio interface identification and monitoring method based on impedance and signal detection further includes step S4, the working mode management step: When the host device is in an idle state where it is not playing audio, step S2, the device type identification step, is executed periodically to monitor the connection status. When the host device starts playing audio, switch to the working mode and execute step S3, the signal status monitoring step.

[0009] This invention adopts the following technical solution: a 3.5mm audio interface identification and monitoring system based on impedance and signal detection, applicable to any one of the above technical solutions of the 3.5mm audio interface identification and monitoring method based on impedance and signal detection. The 3.5mm audio interface identification and monitoring system based on impedance and signal detection includes: Impedance detection circuit, coupled to the left and right channels of the 3.5mm audio interface, is used to measure the DC impedance of the left channel to common ground and the right channel to common ground. The signal sampling and detection circuit is coupled to the left and right channels of the 3.5mm audio interface for sampling audio signals. The microcontroller unit, connected to the impedance detection circuit and the signal sampling detection circuit, is configured to execute step S2, the device type identification step and step S3, and the signal status monitoring step.

[0010] As a preferred embodiment of the above technical solutions, the microcontroller unit is further configured as follows: In idle mode, the control impedance detection circuit performs periodic DC impedance measurements; In playback mode, the control signal sampling and detection circuit performs real-time sampling and analysis of the audio signal.

[0011] As a preferred technical solution to the above technical solutions, the signal sampling and detection circuit includes an analog-to-digital converter and a peak detection circuit.

[0012] As a preferred technical solution to the above technical solutions, the microcontroller unit is also connected to the central processing unit of the host device through a communication interface, which is used to report the determined device type and / or audio output status to the host device.

[0013] As a preferred technical solution to the above technical solutions, the communication interface is an I2C bus or a UART asynchronous serial communication interface.

[0014] The present invention adopts the following technical solutions, electronic devices, including any one of the above technical solutions of a 3.5mm audio interface identification and monitoring system based on impedance and signal detection.

[0015] The 3.5mm audio interface identification and monitoring system and method based on impedance and signal detection disclosed in this invention have the following advantages: by combining impedance detection and signal analysis to form multimodal monitoring, the system improves the ability to identify the type of 3.5mm audio interface connected devices and diagnose real-time signal status. This helps to overcome the limitations of traditional solutions that can only detect physical plugging and unplugging, significantly improving device type identification capabilities, fault diagnosis efficiency, and user experience. It also has the advantages of low power consumption and easy integration. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the 3.5mm audio interface identification and monitoring method based on impedance and signal detection proposed in this application. Detailed Implementation

[0017] This invention discloses a 3.5mm audio interface identification and monitoring system based on impedance and signal detection, and a 3.5mm audio interface identification and monitoring method based on impedance and signal detection. The specific implementation of this invention will be further described below with reference to the preferred embodiment (Example 1).

[0018] Example 1.

[0019] Preferably, the 3.5mm audio interface identification and monitoring method based on impedance and signal detection includes the following steps: Step S1, Device Insertion Detection Step: A device is detected inserted into the 3.5mm audio interface; Step S2, Device Type Identification Step: Measure the DC impedance of the left channel to common ground and the right channel to common ground of the interface, and determine the type of the inserted device based on the range of DC impedance values. Step S3, Signal Status Monitoring Step: In audio playback mode, sample the audio signals on the left and right channels, and determine the audio output status based on the sampling results.

[0020] In step S2, determining the type of the inserted device includes: When the DC impedance is greater than the first preset threshold, the inserted device is determined to be a wire or a faulty device. When the DC impedance is within the typical headphone impedance range, the inserted device is determined to be a headphone; When the DC impedance is less than the second preset threshold, the inserted device is determined to be a passive speaker; When the DC impedance is higher than the typical headphone impedance range, the inserted device is determined to be an active speaker.

[0021] In step S3, determining the audio output status includes: When valid audio signals are detected in both left and right channels, the stereo playback is considered to be normal. When only the left channel or only the right channel detects a valid audio signal, it is determined that the right channel or the left channel is abnormal. When no valid audio signal is detected in either the left or right channel, it is determined to be a silent fault.

[0022] The 3.5mm audio interface identification and monitoring method based on impedance and signal detection also includes step S4, the working mode management step: When the host device is in an idle state where it is not playing audio, step S2, the device type identification step, is executed periodically to monitor the connection status. When the host device starts playing audio, switch to the working mode and execute step S3, the signal status monitoring step.

[0023] Preferably, the 3.5mm audio interface identification and monitoring system based on impedance and signal detection is applied to any of the above technical solutions of the 3.5mm audio interface identification and monitoring method based on impedance and signal detection. The 3.5mm audio interface identification and monitoring system based on impedance and signal detection includes: Impedance detection circuit, coupled to the left and right channels of the 3.5mm audio interface, is used to measure the DC impedance of the left channel to common ground and the right channel to common ground. The signal sampling and detection circuit is coupled to the left and right channels of the 3.5mm audio interface for sampling audio signals. The microcontroller unit, connected to the impedance detection circuit and the signal sampling detection circuit, is configured to execute step S2, the device type identification step and step S3, and the signal status monitoring step.

[0024] The microcontroller unit is further configured as follows: In idle mode, the control impedance detection circuit performs periodic DC impedance measurements; In playback mode, the control signal sampling and detection circuit performs real-time sampling and analysis of the audio signal.

[0025] The signal sampling and detection circuit includes an analog-to-digital converter and a peak detection circuit.

[0026] The microcontroller unit is also connected to the central processing unit of the host device via a communication interface, and is used to report the determined device type and / or audio output status to the host device.

[0027] The communication interface is either an I2C bus or a UART asynchronous serial communication interface.

[0028] Preferably, the electronic device includes any of the above technical solutions of the 3.5mm audio interface identification and monitoring system based on impedance and signal detection.

[0029] The following describes the overall concept of the 3.5mm audio interface identification and monitoring system and method based on impedance and signal detection disclosed in this embodiment: Impedance detection and signal sampling detection circuits are integrated into a traditional 3.5mm audio interface circuit, and coordinated and controlled by a microcontroller unit (MCU), constructing an intelligent monitoring system that integrates device type identification and signal status monitoring. First, the DC impedance of the interface is measured to distinguish whether the inserted device is an earphone, speaker, or wire. Then, during audio playback, the AC signal is analyzed in real time to diagnose whether the channel output is normal, thereby achieving comprehensive and intelligent monitoring and diagnosis of the 3.5mm audio interface from physical connection to electrical signal quality.

[0030] It is worth mentioning that the specific model and other technical features of the microcontroller involved in this patent application should be regarded as prior art. The specific structure, working principle and possible control method and spatial arrangement of these technical features can be selected using conventional methods in the field, and should not be regarded as the inventive point of this patent. This patent will not be further elaborated in detail.

[0031] For those skilled in the art, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the protection scope of this invention.

Claims

1. A method for identifying and monitoring a 3.5mm audio interface based on impedance and signal detection, characterized in that, Includes the following steps: Step S1, Device Insertion Detection Step: A device is detected inserted into the 3.5mm audio interface; Step S2, Device Type Identification Step: Measure the DC impedance of the left channel to common ground and the right channel to common ground of the interface, and determine the type of the inserted device based on the range of DC impedance values. Step S3, Signal Status Monitoring Step: In audio playback mode, sample the audio signals on the left and right channels, and determine the audio output status based on the sampling results.

2. The 3.5mm audio interface identification and monitoring method based on impedance and signal detection according to claim 1, characterized in that, In step S2, determining the type of the inserted device includes: When the DC impedance is greater than the first preset threshold, the inserted device is determined to be a wire or a faulty device. When the DC impedance is within the typical headphone impedance range, the inserted device is determined to be a headphone; When the DC impedance is less than the second preset threshold, the inserted device is determined to be a passive speaker; When the DC impedance is higher than the typical headphone impedance range, the inserted device is determined to be an active speaker.

3. The 3.5mm audio interface identification and monitoring method based on impedance and signal detection according to claim 1, characterized in that, In step S3, determining the audio output status includes: When valid audio signals are detected in both left and right channels, the stereo playback is considered to be normal. When only the left channel or only the right channel detects a valid audio signal, it is determined that the right channel or the left channel is abnormal. When no valid audio signal is detected in either the left or right channel, it is determined to be a silent fault.

4. The 3.5mm audio interface identification and monitoring method based on impedance and signal detection according to claim 1, characterized in that, The 3.5mm audio interface identification and monitoring method based on impedance and signal detection also includes step S4, the working mode management step: When the host device is in an idle state where it is not playing audio, step S2, the device type identification step, is executed periodically to monitor the connection status. When the host device starts playing audio, switch to the working mode and execute step S3, the signal status monitoring step.

5. A 3.5mm audio interface identification and monitoring system based on impedance and signal detection, characterized in that, The 3.5mm audio interface identification and monitoring system based on impedance and signal detection, applied to the impedance and signal detection-based 3.5mm audio interface identification and monitoring method as described in claim 1, comprises: Impedance detection circuit, coupled to the left and right channels of the 3.5mm audio interface, is used to measure the DC impedance of the left channel to common ground and the right channel to common ground. The signal sampling and detection circuit is coupled to the left and right channels of the 3.5mm audio interface for sampling audio signals. The microcontroller unit, connected to the impedance detection circuit and the signal sampling detection circuit, is configured to execute step S2, the device type identification step and step S3, and the signal status monitoring step.

6. The 3.5mm audio interface identification and monitoring system based on impedance and signal detection according to claim 5, characterized in that, The microcontroller unit is further configured as follows: In idle mode, the control impedance detection circuit performs periodic DC impedance measurements; In playback mode, the control signal sampling and detection circuit performs real-time sampling and analysis of the audio signal.

7. The 3.5mm audio interface identification and monitoring system based on impedance and signal detection according to claim 5, characterized in that, The signal sampling and detection circuit includes an analog-to-digital converter and a peak detection circuit.

8. The 3.5mm audio interface identification and monitoring system based on impedance and signal detection according to claim 5, characterized in that, The microcontroller unit also connects to the central processing unit of the host device via a communication interface to report the determined device type and / or audio output status to the host device.

9. The 3.5mm audio interface identification and monitoring system based on impedance and signal detection according to claim 8, characterized in that, The communication interface is either an I2C bus or a UART asynchronous serial communication interface.

10. An electronic device, characterized in that, Includes the 3.5mm audio interface identification and monitoring system based on impedance and signal detection as described in any one of claims 5 to 9.

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