CN207603853U - Active noise reduction Bluetooth headset - Google Patents

Abstract

The utility model belongs to the technical field of bluetooth headset, a active bluetooth headset of making an uproar that falls is disclosed, include: a bluetooth antenna for receiving and transmitting bluetooth signals; the Bluetooth module is connected with the Bluetooth antenna and used for receiving the Bluetooth signal and outputting a digital audio signal; the noise acquisition module is used for acquiring a noise signal; the noise reduction module is connected with the Bluetooth module and the noise acquisition module and used for receiving the digital audio signal, actively reducing the noise of the digital audio signal and converting the digital audio signal into an analog audio signal to be output; and the power supply module is connected with the Bluetooth module and the noise reduction module and used for supplying power to the Bluetooth module and the noise reduction module. Above-mentioned active bluetooth headset of making an uproar that falls has the good function of making an uproar that falls, and the interference killing feature is strong, and the sound signal loss is low, can effectively improve the sound quality of conversation or listening frequency.

Description

An active noise reduction bluetooth headset

technical field

The utility model belongs to the technical field of bluetooth earphones, in particular to an active noise reduction bluetooth earphone.

Background technique

As a Bluetooth communication device used in conjunction with communication terminals, Bluetooth earphones have been more and more widely used by virtue of the incomparable wireless transmission function of ordinary wired earphones.

In the prior art, the transmission mode between the Bluetooth device and the noise reduction processing device is an analog audio signal transmission mode, that is, after the Bluetooth device receives the digital audio signal transmitted from the transmitter, the digital audio signal must be transferred to the Bluetooth device part first. The signal is converted into an analog audio signal through a digital-to-analog conversion circuit, and then the converted analog audio signal is sent to a noise reduction processing device for processing and then played through a sound playback device, and this analog audio signal transmission method is used to transmit analog audio The signal is susceptible to external interference and loss of sound signal, resulting in some noise and sound quality degradation and distortion.

Therefore, the traditional noise-cancelling bluetooth headset has the problem that the sound quality is degraded due to external interference and sound signal loss during audio signal transmission.

Contents of the invention

The purpose of the utility model is to provide an active noise reduction bluetooth headset, which solves the problem that the traditional noise reduction bluetooth headset is susceptible to external interference and sound signal loss during the audio signal transmission process, resulting in a decline in sound quality.

The embodiment of the utility model is achieved in this way, an active noise reduction bluetooth headset, comprising: a bluetooth antenna for receiving and transmitting bluetooth signals; connected with the bluetooth antenna for receiving the bluetooth signals and outputting digital A bluetooth module for audio signals; a noise collection module for collecting noise signals; connected with the bluetooth module and the noise collection module for receiving the digital audio signal, and converting the digital audio signal after active noise reduction A noise reduction module outputting an analog audio signal; and a power supply module connected to the Bluetooth module and the noise reduction module for supplying power to the Bluetooth module and the noise reduction module.

Further, the active noise reduction Bluetooth headset also includes a sound playback module connected to the noise reduction module for receiving and playing the analog audio signal output by the noise reduction module.

Further, the active noise reduction bluetooth headset also includes a sound collection module connected to the noise reduction module for receiving analog audio signals.

Further, the digital audio signal is transmitted between the Bluetooth module and the noise reduction module through an I2S bus.

Further, control commands are transmitted between the Bluetooth module and the noise reduction module through an I2C bus.

Further, the active noise reduction bluetooth headset also includes a button module connected with the bluetooth module for switching on and off and controlling functions.

Further, the active noise reduction bluetooth headset also includes a status indication module connected to the bluetooth module.

Further, the active noise reduction bluetooth headset also includes a charging interface for connecting with an external charger.

Further, the charging interface is a USB interface, a Type-C interface or a Micro USB interface.

Further, the Bluetooth module and the noise reduction module are integrated on the same chip.

The above-mentioned active noise reduction Bluetooth headset can perform active noise reduction processing on the received Bluetooth signal, and the transmission mode between the Bluetooth module and the noise reduction module is I2S digital audio signal transmission mode, which has a good noise reduction function, and Strong anti-interference ability, low sound signal loss, can effectively improve the sound quality of calls or listening to audio.

Description of drawings

FIG. 1 is a schematic diagram of a circuit module of an active noise reduction Bluetooth headset of the present invention.

Fig. 2 is an example circuit schematic diagram of the bluetooth module in the active noise reduction bluetooth headset circuit shown in Fig. 1 .

Fig. 3 is an example circuit schematic diagram of the noise collection module in the active noise reduction bluetooth headset circuit shown in Fig. 1 .

FIG. 4 is an example circuit schematic diagram of a noise reduction module in the active noise reduction Bluetooth headset circuit shown in FIG. 1 .

Fig. 5 is an example circuit schematic diagram of the sound playing module in the active noise reduction bluetooth headset circuit shown in Fig. 1 .

Fig. 6 is an example circuit schematic diagram of the sound collection module in the active noise reduction bluetooth headset circuit shown in Fig. 1 .

FIG. 7 is a circuit schematic diagram of an example of the interface of the I2S bus in the active noise reduction Bluetooth headset circuit shown in FIG. 1 .

FIG. 8 is an example circuit schematic diagram of a button module in the active noise reduction Bluetooth headset circuit shown in FIG. 1 .

FIG. 9 is a schematic circuit diagram of an example of a state indication module in the active noise reduction Bluetooth headset circuit shown in FIG. 1 .

FIG. 10 is an example circuit schematic diagram of a charging interface.

Fig. 11 is a schematic circuit diagram of an example in which the Bluetooth module and the noise reduction module of the active noise reduction Bluetooth headset of the present invention are integrated on the same chip.

FIG. 12 is an example circuit schematic diagram of the Bluetooth antenna in the active noise reduction Bluetooth headset circuit shown in FIG. 1 .

FIG. 13 is an example circuit schematic diagram of a power module in the active noise reduction Bluetooth headset circuit shown in FIG. 1 .

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Please refer to Fig. 1 to Fig. 13, among the preferred embodiment of the utility model, the active noise reduction bluetooth earphone comprises bluetooth antenna 11, bluetooth module 12, noise collection module 13, noise reduction module 14, power supply module 15, sound playing module 16 , a sound collection module 17, a button module 18, a status indicating module 19 and a charging interface 20. Wherein, bluetooth module 12 is connected with bluetooth antenna 11, noise reduction module 14, power supply module 15, button module 18 and status indication module 19, and noise reduction module 14 is connected with noise collection module 13, power supply module 15, sound playback module 16 and sound collection Module 17 is connected.

The bluetooth antenna 11 is used to receive and transmit bluetooth signals, and the bluetooth antenna 11 can carry out bluetooth matching with other electronic devices such as mobile phones, flat panels, etc., and plays the effect of data connection or conversation; the bluetooth module 12 is used to receive bluetooth signals, and output digital Audio signal; noise collection module 13 is used for collecting noise signal; Noise reduction module 14 is used for receiving digital audio signal, and after described digital audio signal active noise reduction is converted into analog audio signal output; Power supply module 15 is used for bluetooth module 12 and the noise reduction module 14 are powered; the sound playing module 16 is used to receive the analog audio signal output by the noise reduction module 14 and plays it; the sound collection module 17 is used to receive the analog audio signal; The bus transmits digital audio signals; the Bluetooth module 12 and the noise reduction module 14 transmit control commands through the I2C bus; the button module 18 is used for switching on and off and function control; the charging interface 20 is connected to an external charger for charging the power supply module 15 ; The charging interface 20 is a USB interface, a Type-C interface or a Micro USB interface. The active noise reduction bluetooth headset of the present invention also includes 26M crystal and 32K crystal, wherein, 26M crystal is used to provide the main clock of the system, and 32K crystal is used for low power consumption of the system.

Bluetooth antenna 11, as a key device for wireless transmission and reception, can transmit the signal of Bluetooth module 12 to an external receiving terminal, and can also receive external signals, so that the active noise reduction Bluetooth headset of the present invention can answer Bluetooth calls and play Bluetooth music and other functions into one.

The Bluetooth module 12 and the noise reduction module 14 can be integrated on the same chip, and the Bluetooth module 12 and the noise reduction module 14 can also be implemented by using different control chips respectively. As shown in FIG. 11 , it is a schematic circuit diagram of an example in which the Bluetooth module 12 and the noise reduction module 14 are integrated on the same chip U3 . As shown in Fig. 2, Fig. 4 and Fig. 7, the bluetooth module 12 and the noise reduction module 14 respectively use different control chips to realize the example circuit schematic diagram, wherein, the bluetooth module 12 includes a main control chip U1, and the noise reduction module 14 Including a main control chip U2, the Bluetooth module 12 and the noise reduction module 14 are provided with a plurality of pins, the I2S_LRCK pin, I2S_BCLK pin, I2S_ADCDAT pin, I2S_DACDAT pin and I2S_MCLK pin of the Bluetooth module 12 pass through the resistor R8, the resistor R9, the resistor R8, and the I2S_MCLK pin respectively. R10, resistor R11 and resistor R12 are connected with the LRCK1 pin, BCLK1 pin, ADCDAT1 pin, DACDAT1 pin and MCLK pin of the noise reduction module 14, so that the digital audio signal received by the Bluetooth module 12 is transmitted to the noise reduction module 12 through the I2S digital audio transmission mode. The noise module 14 performs active noise reduction processing. The I2C_SDA pin and the I2C_SCL pin of the Bluetooth module 12 are respectively connected to the noise reduction module 14 through a resistor R6 and a resistor R7 to realize the transmission of various control commands between the Bluetooth module 12 and the noise reduction module 14 . The noise reduction module 14 can automatically reduce the interference of noise when the user listens to the audio with the earphone, so that the user can experience a better auditory effect.

The active noise-canceling Bluetooth headset also includes a charging module (not shown), which is connected to the charging interface 20. The charging module is used to detect whether the charging interface 20 has power access, and start charging when the charging interface 20 has power access. Function, for example, when the charging module detects that 5V voltage is connected, the charging function is activated. At this time, the active noise reduction Bluetooth headset can be charged through an external charger.

The button module 18 includes a switch SW1, a switch SW2, a switch SW3 and a switch SW4. The first end of the switch SW1 is connected to the KEY0 pin of the Bluetooth module 12, the second end of SW1 is grounded, and the first end of SW2 is connected to the KEY1 pin of the Bluetooth module 12. The second end of SW2 is grounded, the first end of switch SW3 is connected to the KEY2 pin of the Bluetooth module 12, the second end of SW3 is grounded, the first end of the switch SW4 is connected to the KEY3 pin of the Bluetooth module 12, the second end of SW4 is grounded, and the key Module 18 is used for switching on and off and function control, function control includes volume adjustment, answering/rejecting calls, switching songs, pausing, music playing, etc., the user can perform various operations through the button module 18, and the specific function setting can be based on the main control Chip U1 is programmed to achieve this.

Status indicating module 19 comprises light-emitting diode LED0, light-emitting diode LED1, resistance R1 and resistance R2, the first end of light-emitting diode LED0 is connected bluetooth module 12, the second end of light-emitting diode LED0 is connected the first end of resistance R1, the first end of resistance R1 The two ends are grounded, the first end of the light-emitting diode LED1 is connected to the Bluetooth module 12, the second end of the light-emitting diode LED1 is connected to the first end of the resistor R2, and the second end of the resistor R2 is grounded; the status indicator module 19 can be used for low-power warning , Bluetooth status indication and noise reduction status indication, etc., for example, the status indication module 19 can be used to indicate whether the current state of the active noise reduction Bluetooth headset is connected or not connected, whether the battery is too low, whether the noise reduction function has been turned on, etc., Here, the corresponding setting for the display status of the LED light may also be other reasonable settings.

The working principle of an active noise reduction bluetooth earphone provided by the utility model is as follows: when answering the phone or listening to music, the bluetooth signal output by the external electronic device is received through the bluetooth antenna 11, the bluetooth signal is a digital audio signal, and the bluetooth module 12 receives The digital audio signal is transmitted to the noise reduction module 14 by the I2S bus, and the noise acquisition module 13 collects the noise signal and outputs it to the noise reduction module 14. The noise reduction module 14 is a DSP noise reduction processing device (Digital Signal Processor, digital signal processor). The noise module 14 converts the received digital audio signal into an analog audio signal after active noise reduction and then plays it out through the sound player. The noise reduction module 14 also includes a sound collection module 15, which can collect the analog audio signal through the microphone of the sound collection module. And the collected analog audio signal is converted into a digital audio signal and transmitted to the Bluetooth module 12 through the I2S bus, and then transmitted to the intelligent terminal through the Bluetooth antenna 11.

The technical solution of the utility model can carry out active noise reduction processing on the received Bluetooth signal, and the transmission mode between the Bluetooth module and the noise reduction module is the I2S digital audio signal transmission mode, which has a good noise reduction function and is resistant to Strong interference ability, low sound signal loss, can effectively improve the sound quality of calls or listening to audio.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (10)

1. An active noise reduction bluetooth headset, characterized in that, comprising: Bluetooth antenna for receiving and transmitting Bluetooth signals; Connected with the bluetooth antenna, used to receive the bluetooth signal, and output the bluetooth module of the digital audio signal; A noise collection module for collecting noise signals; A noise reduction module connected to the Bluetooth module and the noise collection module for receiving the digital audio signal and converting the digital audio signal into an analog audio signal output after active noise reduction; and A power module connected with the Bluetooth module and the noise reduction module and used for supplying power to the Bluetooth module and the noise reduction module. 2. The active noise reduction bluetooth earphone according to claim 1, wherein the active noise reduction bluetooth earphone also includes an analog audio frequency connected to the noise reduction module for receiving the output of the noise reduction module. Signal and play the sound player module. 3. The active noise reduction bluetooth earphone according to claim 1, characterized in that, the active noise reduction bluetooth earphone further comprises a sound collection module connected to the noise reduction module for receiving analog audio signals. 4. The active noise reduction Bluetooth headset according to claim 1, wherein the digital audio signal is transmitted between the Bluetooth module and the noise reduction module through an I2S bus. 5. The active noise reduction bluetooth headset according to claim 1, wherein a control command is transmitted between the bluetooth module and the noise reduction module through an I2C bus. 6. The active noise reduction bluetooth headset according to claim 1, characterized in that, the active noise reduction bluetooth headset further comprises a button module connected to the bluetooth module for switching on and off and function control. 7. The active noise reduction bluetooth earphone according to claim 1, characterized in that, the active noise reduction bluetooth earphone further comprises a status indicating module connected with the bluetooth module. 8. The active noise reduction bluetooth headset according to claim 1, wherein the active noise reduction bluetooth headset further comprises a charging interface for connecting with an external charger. 9. The active noise reduction Bluetooth headset according to claim 8, wherein the charging interface is a USB interface, a Type-C interface or a Micro USB interface. 10. The active noise reduction Bluetooth headset according to claim 1, wherein the Bluetooth module and the noise reduction module are integrated on the same chip.