Bluetooth wireless microphone

Abstract

The utility model discloses a Bluetooth wireless microphone, which comprises a central processing unit, a power management module, an LED driver, a pickup, an audio power amplifier, a key module, a gravity sensing module, an echo cancellation module, an LED lattice screen, a low-power-consumption Bluetooth chip and a double-rate synchronous dynamic random access memory, wherein the central processing unit is respectively connected with the power management module, the LED driver, the sound pickup, the audio power amplifier, the key module, the gravity sensing module, the echo cancellation module, the LED lattice screen, the low-power-consumption Bluetooth chip and the double-rate synchronous dynamic random access memory, and the LED driver is connected with the LED lattice screen. The sound pickup is respectively connected with the audio power amplifier and the echo cancellation module. According to the utility model, the sound quality of audio playing is not damaged while the power consumption is greatly reduced, the transmission delay can be effectively reduced, and smooth audio transmission experience is provided.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic circuit technical field especially relates to a bluetooth wireless microphone. BACKGROUND

[0002] With the improvement of people's living standards, people also pay more attention to the rich spiritual world, so various entertainment methods appear in people's daily life. Among various entertainment methods, music entertainment activities occupy a large proportion. Due to the convenience of wireless microphone, people usually use wireless microphone to carry out music entertainment activities. The traditional wireless microphone usually adopts analog signal transmission or digital signal transmission based on other wireless communication technology, but the traditional wireless microphone often has problems of high power consumption and large transmission delay, which leads to that users cannot get satisfactory use experience. Therefore, for the existing wireless microphone, how to improve and reduce its power consumption to prolong the endurance time and reduce the transmission delay is a technical problem that each enterprise has been researching, and the above technical problems need to be overcome to improve the competitiveness of products and the use experience of users. SUMMARY

[0003] The utility model discloses a bluetooth wireless microphone, which greatly reduces power consumption without damaging the sound quality of audio playback, effectively reduces transmission delay and provides smooth audio transmission experience.

[0004] In order to solve the above technical problems, the utility model provides a bluetooth wireless microphone, the bluetooth wireless microphone includes: central processing unit, power management module, light emitting diode LED driver, sound pickup, audio power amplifier, button module, gravity sensing module, echo cancellation module, LED dot matrix screen, low power consumption bluetooth chip and double rate synchronous dynamic random access memory, wherein:

[0005] The central processing unit is connected with the power management module, light emitting diode LED driver, sound pickup, audio power amplifier, button module, gravity sensing module, echo cancellation module, LED dot matrix screen, low power consumption bluetooth chip and double rate synchronous dynamic random access memory respectively, the LED driver is connected with the LED dot matrix screen, and the sound pickup is connected with the audio power amplifier and echo cancellation module respectively.

[0006] Optionally, the central processing unit adopts a digital audio processor.

[0007] Optionally, the digital audio processor is built-in 32-bit microprocessor, analog-to-digital converter and fast Fourier transform accelerator.

[0008] Optionally, the power management module includes a charging ring, MP2672GD battery charging management chip and voltage stabilizer.

[0009] Optionally, the gravity sensing module comprises a high-precision three-axis accelerometer and a gyroscope sensor.

[0010] Optionally, the echo cancellation module comprises a filter circuit and a level conversion circuit.

[0011] Optionally, the LED dot matrix screen is built-in with an LED matrix, and the LED dot matrix screen is connected with the central processor through a display data input / output port.

[0012] Optionally, the low-power Bluetooth chip adopts a BT8961B2 Bluetooth chip, and the BT8961B2 Bluetooth chip is connected with the central processor through a universal asynchronous receiver-transmitter (UART) interface.

[0013] Optionally, the BT8961B2 Bluetooth chip integrates a baseband processor and a radio frequency front-end chip.

[0014] Optionally, the Bluetooth wireless microphone further comprises a phase-locked loop modulator connected with the central processor.

[0015] The utility model provides a kind of Bluetooth wireless microphone, by the cooperation of low-power Bluetooth chip and power management module, using BT8961B2 Bluetooth chip can play the role of low-power use, the MP2672GD battery charging management chip and voltage stabilizer included in power management module can greatly reduce power consumption and reduce additional power consumption when wireless microphone is used, by the combined use of low-power Bluetooth chip and power management module, can greatly reduce power consumption while not damaging the sound quality of audio playback, so as to effectively improve the endurance time of whole machine, by the cooperation of BT8961B2 Bluetooth chip and digital audio processor, can reduce transmission delay, provide more smooth audio transmission experience, so as to provide more satisfactory wireless microphone use experience for user. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, below will be to the drawing used in the embodiment or prior art description briefly introduced, obviously, the drawing in the following description only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, according to these drawings, other drawings can also be obtained.

[0017] Figure 1 It is the structure composition schematic diagram of Bluetooth wireless microphone in the embodiment of the utility model. DETAILED DESCRIPTION

[0018] Clearly and completely describe the technical scheme in the embodiments of the utility model with reference to the drawings in the embodiments of the utility model, obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the scope of protection of the utility model.

[0019] The Bluetooth audio transmission system provided in the embodiments of the utility model, as shown in the drawings, Figure 1 As shown in the drawings, Figure 1 The structure of the Bluetooth wireless microphone in the embodiments of the utility model is shown in the schematic diagram, the Bluetooth wireless microphone comprises: a central processor, a power management module, a light emitting diode (LED) driver, a sound pickup device, an audio power amplifier, a key module, a gravity sensing module, an echo cancellation module, an LED dot matrix screen, a low-power Bluetooth chip and a double-rate synchronous dynamic random access memory, wherein: the central processor is connected with the power management module, the light emitting diode (LED) driver, the sound pickup device, the audio power amplifier, the key module, the gravity sensing module, the echo cancellation module, the LED dot matrix screen, the low-power Bluetooth chip and the double-rate synchronous dynamic random access memory respectively, the LED driver is connected with the LED dot matrix screen, and the sound pickup device is connected with the audio power amplifier and the echo cancellation module respectively.

[0020] In the specific implementation process of the utility model, the central processor is used for overall control of the Bluetooth wireless microphone, the power management module is used for power distribution to each component of the Bluetooth wireless microphone, the light emitting diode (LED) driver is used for driving the LED dot matrix screen of the Bluetooth wireless microphone, the sound pickup device is used for converting a sound signal into an electric signal, the audio power amplifier is used for adjusting output audio, the key module comprises a mode key and a key indicator light, the mode key is used for selecting different working modes, the key indicator light is used for displaying the key state, the gravity sensing module is used for ensuring high-precision monitoring of the device posture and motion, different actions of the user can convert different modes, the echo cancellation module is used for eliminating the sound pickup effect of the wireless microphone in a noisy environment, ensuring clear audio quality, the LED dot matrix screen is used for displaying various patterns and characters, so that the user can intuitively check the state of the Bluetooth wireless microphone, the low-power Bluetooth chip is used for realizing low-power and low-latency audio transmission and processing, and the double-rate synchronous dynamic random access memory is used for storing the program and data of the Bluetooth wireless microphone.

[0021] In the specific implementation process of the utility model, the central processor adopts a digital audio processor. The digital audio processor is built-in with a 32-bit microprocessor, an analog-to-digital converter and a fast Fourier transform accelerator.

[0022] Specifically, the audio processor is suitable for any audio processing device which needs to pre-process the audio signal in the audio system state, the audio processor can perform operation processing on the audio signal spectrum according to the built-in microprocessor, and can complete the correction and compensation of the audio spectrum signal, the use of the audio processor not only has high integration and convenient management, but also has strong compatibility, and can achieve more ideal effect. Through the built-in 32-bit microprocessor application layer secondary development of the audio signal sampling and spectrum fast Fourier transform algorithm of the audio processor, the audio signal is sampled through the 32-bit microprocessor and the analog-to-digital converter, and then the spectrum is calculated through the fast Fourier transform accelerator. The fast Fourier transform accelerator supports floating point operation, and can support 1024-point complex fast Fourier transform operation and 2048-point real fast Fourier transform operation, so as to analyze and standardize the audio spectrum. The fast Fourier transform accelerator reduces the calculation time and resource consumption through the optimization of the calculation process, thereby improving the performance and efficiency of the overall system. The accelerator usually includes multiple computing units and controllers, can process multiple data points in parallel, reduces the calculation delay, and improves the accuracy and stability of the calculation. Thus, the performance of the Bluetooth wireless microphone can be effectively improved, and the Bluetooth chip can effectively reduce the delay of Bluetooth audio transmission.

[0023] In the embodiment of the utility model, the power management module comprises a charging ring, an MP2672GD battery charging management chip and a voltage stabilizer.

[0024] Specifically, the charging ring is used for electrically contacting with the charging seat to realize the charging function of the Bluetooth wireless microphone. The MP2672GD battery charging management chip is a highly integrated chip with flexible switching mode. When the input power exists, the chip charges in the boost mode, and the chip automatically detects the battery voltage and the pre-charging, constant current charging and constant voltage charging of the charging battery. The chip also has a thermal regulation cycle for protecting the chip and provides overvoltage protection for the power management module. The voltage stabilizer is used to stabilize the power supply voltage which fluctuates greatly and cannot meet the requirements of the device within the set value range, so that various circuits or devices can work normally under the rated working voltage. The combination of the MP2672GD battery charging management chip and the voltage stabilizer can further reduce the power consumption generated by processing Bluetooth audio and avoid unnecessary power consumption, thereby prolonging the service life of the device.

[0025] In the embodiment of the utility model, the gravity sensing module comprises a high-precision three-axis accelerometer and a gyroscope sensor,

[0026] Specifically, the high-precision three-axis accelerometer can detect and measure the acceleration, speed and position change of the object, and the gyroscope sensor can detect and sense the motion in the space, so as to identify the direction and determine the posture, the accuracy of the high-precision three-axis accelerometer and the gyroscope sensor reaches 0.001g, the high-precision detection of the posture and motion of the microphone is ensured, the microphone can more sensitively perceive the tilt, rotation and shaking motion of the user, so as to convert the mode according to the motion of the user, and the hand feeling of the user holding the Bluetooth wireless microphone can be improved.

[0027] In the embodiment of the utility model, the echo cancellation module comprises a filter circuit and a level conversion circuit.

[0028] Specifically, the multi-channel audio signal is mixed into a single-channel audio signal through the filter circuit and the level conversion circuit, the audio signal has contained all echo information and can well correspond to the received echo audio, and the filter circuit and the level conversion circuit of the echo cancellation module can better filter high-frequency noise.

[0029] In the embodiment of the utility model, the LED dot matrix screen is built-in LED matrix, and the LED dot matrix screen is connected with the central processing unit through a display data input / output port.

[0030] Specifically, the LED dot matrix screen is built-in LED matrix, can realize colorful light effect of the Bluetooth wireless microphone, the lamp ring in the LED matrix uses light-transmitting plastic material and is uniformly sprayed with light guide powder, the light effect of the microphone is more smooth and uniform, the LED dot matrix screen is connected with the central processing unit through a display data input / output port, can display various patterns and characters, so that the user can intuitively check the working state of the microphone, and the user can adjust to different light effects according to different use scenes.

[0031] In the embodiment of the utility model, the low-power Bluetooth chip adopts BT8961B2 Bluetooth chip, and the BT8961B2 Bluetooth chip is connected with the central processing unit through a universal asynchronous receiver-transmitter (UART) interface.

[0032] The BT8961B2 Bluetooth chip integrates a baseband processor and a radio frequency front-end chip.

[0033] Specifically, the BT8961B2 chip supports Bluetooth 5.3 version, and also supports ultra-low power standby and use. Compared with the traditional Bluetooth chip, the power consumption of the BT8961B2 chip is reduced by more than 80%, and the cost is also lower than that of the traditional Bluetooth chip. Using the chip can independently adjust the connection interval time, so that the Bluetooth link speed can be faster. Therefore, using the BT8961B2 chip as the main chip can not only make the system realize low-power operation, but also use the chip as the main chip to play Bluetooth audio in low-power mode without damaging the sound quality of the Bluetooth audio. The BT8961B2 Bluetooth chip supports the fastest 3ms connection establishment and data transmission. The BT8961B2 Bluetooth chip is connected with the central processor through a universal asynchronous receiver / transmitter (UART) interface, and both are suitable for high-activity connection scenarios. This fast connection and low latency feature enables the wireless microphone to quickly respond to user needs and provide a smooth audio transmission experience. The BT8961B2 Bluetooth chip integrates a baseband processor and a radio frequency front-end chip, enabling the wireless microphone to be used in a wider range and achieve a longer communication distance.

[0034] In the specific implementation process of the utility model, the Bluetooth wireless microphone further comprises a phase-locked loop modulator connected with the central processor.

[0035] Specifically, the phase-locked loop controller can use the MB1504 phase-locked loop chip to adjust and lock the working frequency of 20MHz-520MHz, conveniently avoid interference frequency, effectively improve the anti-interference performance of the Bluetooth wireless microphone, and improve the audio quality. The chip is a serial input phase-locked loop frequency synthesis chip, which internally uses pulse swallowing counting technology and frequency and phase discrimination technology, and has high running speed and stable performance.

[0036] In summary, the utility model embodiment provides a kind of Bluetooth wireless microphone, by the cooperation of low-power Bluetooth chip and power management module, using BT8961B2 Bluetooth chip can play the role of low-power use, the MP2672GD battery charging management chip and voltage stabilizer included in power management module can greatly reduce power consumption and reduce additional power consumption when wireless microphone is used, by the combination of low-power Bluetooth chip and power management module, can greatly reduce power consumption while not damaging the sound quality of audio playback, so as to effectively improve the endurance time of whole machine, by the cooperation of BT8961B2 Bluetooth chip and digital audio processor, transmission delay can be reduced, more smooth audio transmission experience is provided, so as to provide more satisfactory wireless microphone use experience for user.

[0037] Those skilled in the art can understand that all or part of the steps in the above-mentioned various methods of the embodiments can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer readable storage medium, which can include a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0038] In addition, the Bluetooth wireless microphone provided by the embodiment of the utility model is introduced in detail above, the principle and implementation mode of the utility model are described by using specific examples in this paper, and the above embodiment is only used to help understand the method and core idea of the utility model; at the same time, for the general technical personnel in the field, according to the idea of the utility model, the specific implementation mode and application range will have changes, and the above is described, and the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A Bluetooth wireless microphone, characterized by The Bluetooth wireless microphone comprises a central processor, a power management module, a light-emitting diode (LED) driver, a sound pickup, an audio power amplifier, a key module, a gravity sensing module, an echo cancellation module, an LED dot matrix screen, a low-power Bluetooth chip and a double-rate synchronous dynamic random access memory (DRAM), wherein: The central processor is connected with the power management module, the LED driver, the sound pickup, the audio power amplifier, the key module, the gravity sensing module, the echo cancellation module, the LED dot matrix screen, the low-power Bluetooth chip and the double-rate synchronous DRAM, respectively; the LED driver is connected with the LED dot matrix screen; and the sound pickup is connected with the audio power amplifier and the echo cancellation module, respectively.

2. The Bluetooth wireless microphone of claim 1, wherein, The central processor is a digital audio processor.

3. The Bluetooth wireless microphone of claim 2, wherein, The digital audio processor is built-in with a 32-bit microprocessor, an analog-to-digital converter and a fast Fourier transform accelerator.

4. The Bluetooth wireless microphone of claim 1, wherein, The power management module comprises a charging ring, an MP2672GD battery charging management chip and a voltage stabilizer.

5. The Bluetooth wireless microphone of claim 1, wherein, The gravity sensing module comprises a high-precision three-axis accelerometer and a gyroscope sensor.

6. The Bluetooth wireless microphone of claim 1, wherein, The echo cancellation module comprises a filter circuit and a level conversion circuit.

7. The Bluetooth wireless microphone of claim 1, wherein, The LED dot matrix screen is built-in with an LED matrix, and is connected with the central processor through a display data input / output port.

8. The Bluetooth wireless microphone of claim 1, wherein, The low-power Bluetooth chip is a BT8961B2 Bluetooth chip, which is connected with the central processor through a universal asynchronous receiver / transmitter (UART) interface.

9. The Bluetooth wireless microphone of claim 8, wherein, The BT8961B2 Bluetooth chip integrates a baseband processor and a radio frequency front-end chip.

10. The Bluetooth wireless microphone of claim 1, wherein, The Bluetooth wireless microphone further comprises a phase-locked loop modulator connected with the central processor.

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