Bluetooth earphone wearing detection and automatic start-stop device

Abstract

The utility model discloses a Bluetooth earphone wearing detection and automatic start-stop device, which comprises a gyroscope detection module for detecting the motion state of an earphone, a human body detection module for preventing the use state of the earphone from being misjudged, and a signal processing module for processing data of the gyroscope detection module and the human body detection module, the control module is used for analyzing the data converted by the signal processing module and controlling the on-off of audio transmission; the human body detection module comprises a capacitive touch sensor chip U1, and a TTP223 model is adopted by the capacitive touch sensor chip U1; according to the utility model, through cooperative work of the human body detection module and the gyroscope detection module, in combination with human body contact signals and motion state data, the wearing state of the earphone and the storage state of the charging cabin can be accurately distinguished. Even if the earphone generates micro motion in the charging cabin, misjudgment cannot be triggered when the capacitive sensor does not detect human body contact, and the problem of false triggering of traditional single gyroscope detection is effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of bluetooth headset, concretely is bluetooth headset wearing detection and automatic start -stop device. BACKGROUND

[0002] Bluetooth headset usually needs long time to use, so the power management part needs high -efficient energy -conservation. Through the retrieval, in the patent of the application publication No. CN207200916U discloses an automatic start -stop earphone, including detection circuit, for the current earphone's orientation is detected, obtains the current orientation information of earphone, and generates corresponding data signal, then the data signal is sent to control circuit;Control circuit, for receiving the data signal of detection circuit transmission, after the state signal is handled, obtains the corresponding control signal, and the control signal is sent to output circuit;Output circuit, for receiving the control signal of control circuit transmission and according to control signal output or stop output audio signal. Through the gyroscope chip, the orientation information of current earphone can be detected at any time, when the earphone is in the specific orientation of pre -set, for example, when being placed on the desktop, after a period of time, the earphone being played can be closed, when picking up the earphone, the gyroscope chip detects the orientation of current earphone and produces deviation, and controls the earphone to automatically start and play.

[0003] The bluetooth headset can enter the sleep state when not in use, switch to the low-power wake-up mode, thereby prolonging the use time of the bluetooth headset. The bluetooth headset detects the motion state of the earphone through the gyroscope chip to determine whether the earphone is used, but the bluetooth headset will also produce micro-movement when placed in the charging cabin, making the detection less sensitive and easy to confuse the judgment. SUMMARY

[0004] The utility model discloses a bluetooth headset wearing detection and automatic start -stop device, through setting human body detection module, the cooperation gyroscope detection module detects whether bluetooth headset is worn, can improve the accuracy of bluetooth headset start -stop, reduces the misjudgment rate and optimizes the use effect of bluetooth headset.

[0005] To achieve the above object, the utility model provides the following technical scheme: bluetooth headset wearing detection and automatic start -stop device, including the gyroscope detection module of detection earphone motion state, the human body detection module of preventing earphone use state is misjudged, the signal processing module of gyroscope detection module and human body detection module data processing, according to the data of signal processing module conversion and control audio transmission open -close control module of analysis;

[0006] The human body detection module includes a capacitive touch sensor chip U1, the capacitive touch sensor chip U1 adopts TTP223 model, and a touch electrode circuit is arranged outside the capacitive touch sensor chip U1.

[0007] The touch electrode circuit comprises a capacitor CS, one end of the capacitor CS is connected with an I interface of a capacitive touch sensor chip U1, and the other end of the capacitor CS is connected with a touch point TP;

[0008] The gyroscope detection module comprises an ENC03-MB gyroscope chip, a fourth pin of the ENC03-MB gyroscope chip is connected with a capacitor C1, one end of the capacitor C1 is connected with a resistor R3, one end of the resistor R3 is connected with a first pin of the ENC03-MB gyroscope chip, a MCP601 operational amplifier is connected between the capacitor C1 and the resistor R3, and a feedback circuit is arranged at an inverting input end of the MCP601 operational amplifier.

[0009] The control module comprises an analog switch U2, the analog switch U2 adopts a TS5A23157 chip, a first pin of the analog switch U2 is connected with a fifth pin and then connected with a pull-down resistor R147, one end of the pull-down resistor R147 is connected with a microcontroller GPIO.

[0010] Preferably, a resistor R1 is connected with a TOG interface of the capacitive touch sensor chip U1, one end of the resistor R1 is grounded, a power supply VCC is connected with a VSS end of the capacitive touch sensor chip U1, one end of the power supply VCC is connected with a resistor R2 and a light-emitting diode D1, and the light-emitting diode D1 is connected with the resistor R2 in series.

[0011] Preferably, the feedback circuit comprises a resistor R4 and a resistor R5, the resistor R4 is connected with a capacitor C4 in parallel, one end of the resistor R2 is connected between the capacitor C3 and the resistor R3, one end of the resistor R4 is connected with an output end of the MCP601 operational amplifier, and the other end of the resistor R4 is connected with an inverting input end of the MCP601 operational amplifier.

[0012] Preferably, the signal processing module comprises an analog-to-digital conversion chip U8, the analog-to-digital conversion chip U8 adopts an ET2046 model, and a signal conditioning circuit is connected with the analog-to-digital conversion chip U8.

[0013] Preferably, the signal conditioning circuit comprises resistors R7, amplifier IC1A and amplifier IC1B, the noninverting input terminal of the amplifier IC1A is connected with resistor R11 and capacitor C11, the output terminal of the amplifier IC1A is connected with the noninverting input terminal of the amplifier IC1B, resistor R14 is connected between the output terminal of the amplifier IC1A and the noninverting input terminal of the amplifier IC1B, the inverting input terminal of the amplifier IC1B is connected with resistor R15 and resistor R16, one end of the resistor R16 is connected with the output terminal of the amplifier IC1B, one end of the resistor R7 is connected with resistor R8, capacitor C12 and diode D2, the resistor R8, capacitor C12 and diode D2 are all connected in parallel, and the cathode of the diode D2 is connected with diode D4.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] 1、The utility model discloses a human body detection module and gyroscope detection module work cooperatively, and the wearing state of the earphone and the charging cabin storage state can be accurately distinguished by combining human body contact signal and motion state data.

[0016] 2、The system triggers the audio stop and low power consumption mode only when the human body contact and motion state satisfy the non-wearing condition at the same time, such as taking off and being stationary, avoids the frequent start and stop caused by single sensor misjudgment. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the system block diagram of the utility model;

[0018] Figure 2 It is the circuit diagram of the human body detection module of the utility model;

[0019] Figure 3 It is the circuit diagram of the gyroscope detection module of the utility model;

[0020] Figure 4 It is the circuit diagram of the signal processing module of the utility model;

[0021] Figure 5 It is the circuit diagram of the signal conditioning circuit of the utility model;

[0022] Figure 6 It is the circuit diagram of the control module of the utility model. DETAILED DESCRIPTION

[0023] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0024] Please refer to Figures 1-6 The utility model provides a technical scheme: bluetooth earphone wearing detection and automatic start and stop device, including the gyro detection module of detection earphone movement state, prevent earphone use state from being misjudged human body detection module, to the signal processing module of gyro detection module and human body detection module data processing, according to the data of signal processing module conversion analysis and control audio transmission on-off control module,

[0025] The human body detection module includes a capacitive touch sensor chip U1, the capacitive touch sensor chip U1 adopts TTP223 model, and the capacitive touch sensor chip U1 is externally provided with a touch electrode circuit.

[0026] The touch electrode circuit includes a capacitor CS, the capacitor CS is connected with the I interface of the capacitive touch sensor chip U1, one end of the capacitor CS is connected with a touch point TP, the TOG interface of the capacitive touch sensor chip U1 is connected with a resistor R1, one end of the resistor R1 is grounded, the VSS end of the capacitive touch sensor chip U1 is connected with a power supply VCC, one end of the power supply VCC is connected with a resistor R2 and a light emitting diode D1, and the light emitting diode D1 is connected with the resistor R2 in series.

[0027] The wearing state is judged by detecting the capacitance change caused by human body contact, the TTP223 chip detects the capacitance between the touch point TP and the ground, when the human body contacts TP, the equivalent capacitance increases, the chip outputs high level, the TOG pin is grounded through the resistor R1, and is set to single-click trigger mode. The power supply VCC drives the light emitting diode D1 through the resistor R2, the light emitting diode D1 is bright when touched, and visual feedback is provided.

[0028] The gyro detection module includes an ENC03-MB gyro chip, the fourth pin of the ENC03-MB gyro chip is connected with a capacitor C1, one end of the capacitor C1 is connected with a resistor R3, one end of the resistor R3 is connected with the first pin of the ENC03-MB gyro chip, an MCP601 operational amplifier is connected between the capacitor C1 and the resistor R3, and the inverting input end of the MCP601 operational amplifier is provided with a feedback circuit.

[0029] The gyroscope detection module senses the earphone motion state through the angular velocity signal, distinguishes between wearing and taking off, and the ENC03-MB first pin outputs a voltage signal proportional to the angular velocity; a low-pass filter is formed by setting the resistance R3 and the capacitance C1 to suppress high-frequency noise; the MCP601 operational amplifier constitutes an inverting amplification circuit, and the gain is set by the feedback resistance R4 / R5 ratio; the capacitance C4 is connected in parallel with R4 to limit the high-frequency gain and avoid oscillation.

[0030] The feedback circuit comprises a resistance R4 and a resistance R5, the resistance R4 is externally connected in parallel with a capacitance C4, one end of the resistance R2 is connected between the capacitance C3 and the resistance R3, one end of the resistance R4 is connected with the output end of the MCP601 operational amplifier, and the other end of the resistance R4 is connected with the reverse input end of the MCP601 operational amplifier.

[0031] The signal processing module comprises an analog-to-digital conversion chip U8, the analog-to-digital conversion chip U8 adopts an ET2046 model, and the signal processing circuit is connected to the outside of the analog-to-digital conversion chip U8.

[0032] The signal conditioning circuit comprises a resistance R7, an amplifier IC1A and an amplifier IC1B, the positive input end of the amplifier IC1A is connected with a resistance R11 and a capacitance C11, the output end of the amplifier IC1A is connected with the positive input end of the amplifier IC1B, a resistance R14 is connected between the output end of the amplifier IC1A and the positive input end of the amplifier IC1B, the reverse input end of the amplifier IC1B is connected with a resistance R15 and a resistance R16, one end of the resistance R16 is connected with the output end of the amplifier IC1B, one end of the resistance R7 is connected with a resistance R8, a capacitance C12 and a diode D2, the resistance R8, the capacitance C12 and the diode D2 are all connected in parallel, and the negative electrode of the diode D2 is connected with a diode D4.

[0033] The signal processing module converts the analog signal into a digital signal for analysis by the control module, the resistance R11 and the capacitance C11 form a low-pass filter to eliminate signal burrs, IC1A and IC1B constitute two-stage same-phase amplification, R14, R15 and R16 set the total gain, diodes D2 and D4 clamp the input voltage to prevent ADC overvoltage damage. ET2046 converts the conditioned analog signal into a digital quantity and transmits it to the control module through SPI / I2C.

[0034] The control module comprises an analog switch U2, the analog switch U2 adopts a TS5A23157 chip, the first pin and the fifth pin of the analog switch U2 are connected and then connected with a pull-down resistance R147, one end of the pull-down resistance R147 is connected with a microcontroller GPIO.

[0035] By setting the control module, the controller GPIO analyzes the digital signal. By setting the pull-down resistor R147, it is ensured that the switch remains open when the GPIO is floating, avoiding false triggering.

[0036] In use, the gyroscope detection module senses the earphone motion state through the angular velocity signal, and distinguishes between wearing and taking off. Meanwhile, the TTP223 chip detects the capacitance between the touch point TP and the ground. When the human body contacts TP, the equivalent capacitance increases, triggering the chip to output a high level. The detection of human body contact is judged as a wearing state. If the earphone is detected to be taken off, i.e. the gyroscope is stationary and there is no human body contact, a low level is output. The TS5A23157 disconnects the audio signal path at a low level, realizing automatic pause; a high level restores the connection.

[0037] Compared with the traditional single gyroscope wearing detection and start-stop circuit, the circuit can improve the accuracy of wearing state detection and optimize the wearing effect of the Bluetooth earphone through the cooperative work of the human body detection module and the gyroscope detection module.

[0038] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A Bluetooth earpiece wear detection and auto-on / off device, characterized in that: Including the gyroscope detection module of detecting earphone motion state, the human body detection module of preventing earphone use state from being misjudged, the signal processing module of data processing of gyroscope detection module and human body detection module, the control module is analyzed according to the data converted by signal processing module and controls the opening and closing of audio transmission; The human body detection module includes a capacitive touch sensor chip U1, the capacitive touch sensor chip U1 adopts TTP223 model, and the capacitive touch sensor chip U1 is externally provided with a touch electrode circuit; The touch electrode circuit includes a capacitor CS, the capacitor CS is connected with the I interface of the capacitive touch sensor chip U1, and one end of the capacitor CS is connected with a touch point TP; The gyroscope detection module includes an ENC03-MB gyroscope chip, the fourth pin of the ENC03-MB gyroscope chip is connected with a capacitor C1, one end of the capacitor C1 is connected with a resistor R3, one end of the resistor R3 is connected with the first pin of the ENC03-MB gyroscope chip, and the capacitor C1 and the resistor R3 are connected with an MCP601 operational amplifier, and the inverting input end of the MCP601 operational amplifier is provided with a feedback circuit; The control module includes an analog switch U2, the analog switch U2 adopts a TS5A23157 chip, the first pin and the fifth pin of the analog switch U2 are connected and then connected with a pull-down resistor R147, one end of the pull-down resistor R147 is connected with a microcontroller GPIO.

2. The Bluetooth earpiece wear detection and auto on-off device of claim 1, wherein: The TOG interface of the capacitive touch sensor chip U1 is connected with a resistor R1, one end of the resistor R1 is grounded, the VSS end of the capacitive touch sensor chip U1 is connected with a power supply VCC, one end of the power supply VCC is connected with a resistor R2 and a light emitting diode D1, and the light emitting diode D1 and the resistor R2 are connected in series.

3. The Bluetooth earpiece wear detection and auto-on / off device of claim 2, wherein: The feedback circuit includes a resistor R4 and a resistor R5, the resistor R4 is externally connected with a capacitor C4 in parallel, one end of the resistor R2 is connected between the capacitor C3 and the resistor R3, one end of the resistor R4 is connected with the output end of the MCP601 operational amplifier, and the other end of the resistor R4 is connected with the reverse input end of the MCP601 operational amplifier.

4. The Bluetooth earpiece wear detection and auto on-off device of claim 3, wherein: The signal processing module includes an analog-to-digital conversion chip U8, the analog-to-digital conversion chip U8 adopts ET2046 model, and the external signal conditioning circuit is connected with the analog-to-digital conversion chip U8.

5. The Bluetooth earpiece wear detection and auto-on / off device of claim 4, wherein: The signal conditioning circuit comprises a resistor R7, an amplifier IC1A and an amplifier IC1B, the noninverting input terminal of the amplifier IC1A is connected with a resistor R11 and a capacitor C11, the output terminal of the amplifier IC1A is connected with the noninverting input terminal of the amplifier IC1B, a resistor R14 is connected between the output terminal of the amplifier IC1A and the noninverting input terminal of the amplifier IC1B, the inverting input terminal of the amplifier IC1B is connected with a resistor R15 and a resistor R16, one end of the resistor R16 is connected with the output terminal of the amplifier IC1B, one end of the resistor R7 is connected with a resistor R8, a capacitor C12 and a diode D2, the resistor R8, the capacitor C12 and the diode D2 are all in parallel, the cathode of the diode D2 is connected with a diode D4.

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