A bluetooth hearing aid circuit

Abstract

The utility model discloses a bluetooth hearing aid circuit, include: bluetooth chip module, hall module and DSP module group, hall module and bluetooth chip module electric connection, bluetooth chip module and DSP module group electric connection, bluetooth chip module connects charging input, and with the battery, low voltage difference linear voltage stabilizer, battery protection module, level conversion module, crystal oscillator, button, antenna, microphone electric connection that arranges in the four -around bluetooth chip module, DSP module group and low voltage difference linear voltage stabilizer, microphone, button, level conversion module and loudspeaker electric connection, and through I2C signal is controlled by bluetooth chip module. The bluetooth hearing aid circuit can pass through bluetooth connection corresponding equipment, also can adjust the volume size according to the demand of self, listens to bluetooth music, answers the phone.

Description

Technical Field

[0001] This utility model relates to the field of circuit technology, specifically to a Bluetooth hearing aid circuit. Background Technology

[0002] With the increasing aging of the population, the demand for hearing aids among people with hearing impairments is growing. Bluetooth technology, with its low power consumption and stable transmission characteristics, is gradually being integrated with hearing aids to form Bluetooth hearing aids, bringing users a more convenient audio experience. Currently, Bluetooth hearing aids on the market typically include an audio processing module, a Bluetooth module, and power management components to achieve hearing aid and Bluetooth connectivity functions.

[0003] However, existing Bluetooth hearing aids have certain shortcomings in their circuit structure design. The lack of efficient hardware connection and control mechanism between their audio processing module and Bluetooth module leads to insufficient coordination between modules when switching between multiple modes (such as hearing aid mode and Bluetooth audio mode), which can easily result in poor power consumption control or delayed function response, affecting the user experience. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a Bluetooth hearing aid circuit to solve the problem of imperfect hardware connection and control mechanisms between modules in existing Bluetooth hearing aids.

[0005] This utility model provides a Bluetooth hearing aid circuit, including: a Bluetooth chip module, a Hall module and a DSP module group; The Hall module is electrically connected to the Bluetooth chip module, and the Bluetooth chip module is electrically connected to the DSP module group; The Bluetooth chip module is connected to the charging input terminal and is electrically connected to the battery, low dropout linear regulator, battery protection module, level conversion module, crystal oscillator, button, antenna and microphone arranged around the Bluetooth chip module. The DSP module group is electrically connected to the low dropout linear regulator, the microphone, the button, the level conversion module and the speaker, and is controlled by the Bluetooth chip module via I2C signal.

[0006] Furthermore, the Bluetooth chip module includes a resonant circuit and an RF filter circuit, and the DSP module group includes a DSP power supply module and a DSP audio processing module. The DSP power supply module controls the low dropout linear regulator through the Bluetooth chip module.

[0007] Furthermore, the DSP power supply module controls the power supply of the DSP audio processing module to be turned on and off via a Bluetooth chip module.

[0008] Furthermore, the microphone synchronously transmits the collected audio signals to the DSP audio processing module and the Bluetooth chip module.

[0009] Furthermore, the Bluetooth chip module model is AC7006D8.

[0010] This invention offers the following advantages: The Bluetooth hearing aid circuit provided by this invention optimizes the hardware connection structure of the Bluetooth chip module, Hall module, and DSP module group, constructing a collaborative working mechanism with the Bluetooth chip module as the main control core. This effectively solves the collaborative working problem caused by the imperfect hardware connection and control mechanism between existing Bluetooth hearing aid modules. The Bluetooth chip module directly controls the DSP module group via I2C signals and achieves precise switching of power supply to the DSP module group by controlling the enable terminal of the LDO, ensuring efficient control of the audio processing module by the main control system. Simultaneously, the dual electrical connection structure between the microphone and the Bluetooth chip module and the DSP module group, combined with the unified drive of the speaker by the DSP module group, achieves synchronous transmission and processing of audio signals, ensuring stable switching between hearing aid mode, Bluetooth mode, and mixing mode. Furthermore, the direct electrical connection between the Hall module and the Bluetooth chip module, combined with the linkage control of the power supply to the DSP module group by the LDO, ensures timely switching of the DSP module group when the device enters or leaves the chamber, effectively avoiding feedback issues within the chamber. The hardware connection between the battery protection module and the Bluetooth chip module enables an ultra-low power consumption mode, improving battery life. By clearly defining the hardware connection relationships and control paths of each module, the overall circuit structure significantly improves the stability and reliability of Bluetooth hearing aids in multi-mode collaborative operation. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a block diagram of the Bluetooth hearing aid circuit according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the DSP power supply module circuit according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the Bluetooth chip module circuit according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the DSP audio processing module according to an embodiment of the present invention. Figure 5 This is a circuit diagram of the battery protection module according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the button circuit according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the microphone circuit according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the level conversion circuit according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the Hall circuit according to an embodiment of the present invention. Detailed Implementation

[0013] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be pointed out that the following detailed description is illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0014] Please see Figure 1 This utility model provides a Bluetooth hearing aid circuit, including: a Bluetooth chip module, a Hall module, and a Digital Signal Processing (DSP) module group; the Hall module is electrically connected to the Bluetooth chip module, and the Bluetooth chip module is electrically connected to the DSP module group. The Bluetooth chip module is connected to the charging input terminal and is electrically connected to a battery, a low dropout regulator (LDO), a battery protection module, a level conversion module, a crystal oscillator, buttons, an antenna, and a microphone arranged around the Bluetooth chip module; the DSP module group is electrically connected to the low dropout regulator, microphone, buttons, level conversion module, and speaker, and is controlled by the Bluetooth chip module via an I2C signal.

[0015] The Bluetooth chip module includes a resonant circuit and an RF filter circuit. The DSP module group includes a DSP power supply module and a DSP audio processing module. The DSP power supply module controls the low-dropout linear regulator through the Bluetooth chip module. The DSP power supply module also controls the power supply to the DSP audio processing module through the Bluetooth chip module. The microphone synchronously transmits the acquired audio signal to both the DSP audio processing module and the Bluetooth chip module. The audio signal from the Bluetooth chip module is directly transmitted to the DSP module group. After processing within the DSP module group, the DSP module group drives the speaker to output sound.

[0016] The buttons are electrically connected to both the Bluetooth chip module and the DSP module group, used for functions such as volume adjustment, answering or rejecting calls, and system power on / off. The microphone is electrically connected to the DSP module group, synchronously transmitting the acquired audio signals to the DSP audio processing module and the Bluetooth chip module. The DSP power supply module controls the LDO's on / off state through the Bluetooth chip module; specifically, it controls the power supply to the DSP audio processing module. The DSP audio processing module is a key module for the hearing aid's functionality.

[0017] In this embodiment, the microphone operates simultaneously in Bluetooth mode and hearing aid mode. A single speaker is provided. When connected to a Bluetooth device, the Bluetooth chip module receives the audio signal, first notifying the DSP to open the Bluetooth audio input port via I2C, then connecting the output pin to the DSP's audio input port. After internal processing by the DSP, the DSP ultimately drives the speaker to output sound. In hearing aid mode, the microphone collects external sound, transmits the signal to the DSP, and after internal processing by the DSP, the DSP drives the speaker to output sound. The Bluetooth chip and DSP easily achieve switching between Bluetooth and hearing aid mixed mode and pure hearing aid mode via I2C.

[0018] Combination Figures 2-9 This further explains the working principle of the Bluetooth hearing aid circuit of this utility model.

[0019] Hearing Aid Mode: Bluetooth chip module U6 (chip model: AC7006D8) prioritizes powering on U13 (model SGM2036-1.3) via pin 6 (PB6). At this time, DSP U4 (chip model: Ezairo5920) begins to work. DSP U4 simultaneously powers microphone U5 (model: ZTS6556S) via pin 2 (VREG), activating the microphone and transmitting the acquired audio signal to the DSP module. U4 plays a core role in the hearing aid function, processing the audio signal from the microphone before driving the speaker to output sound.

[0020] Bluetooth Audio and Hearing Aid Mixing Mode: In Bluetooth mode, the Bluetooth chip module U6 opens pin 4 (AIN_B0) to collect the audio signal from the microphone. After internal processing by the U6 chip, the signal is sent to the Bluetooth device via Bluetooth. At the same time, the Bluetooth chip controls the DSP to open the audio input port pin 3 (DAI) via I2C. The Bluetooth chip internally processes the received audio signal from the Bluetooth device and outputs it to the DSP through pin 28 (DACRP). After internal processing, the DSP drives the speaker to output sound. At this time, the Bluetooth mode and the hearing aid mode coexist in a mixing mode.

[0021] In addition, this circuit has another feature: regardless of the working mode, the volume can be adjusted, scene settings can be switched, and the power can be turned on or off via buttons.

[0022] Machine in / out compartment control: Bluetooth chip module U6 detects the output status of Hall module U2 (chip model MT8891DT) through pin 5 (PB5). When a high level is detected, U6 turns on LDO through pin 6 (PB6), and DSP module starts working; when a low level is detected, U4 turns off LDO through pin 6 (PB6), and DSP module is in the off state to prevent speaker from outputting sound inside the compartment.

[0023] Shipping mode: Bluetooth chip U6 receives commands from the host computer through pin 10 (WPWR, this pin is both a communication pin and a charging pin). The Bluetooth chip then controls the battery protection module U1 (chip model is AXBM20490A) through pin 13 (PB2) and pin 2 (DS) to enter shipping mode, entering an ultra-low power state to ensure that the battery is still in a high power state after the user receives the device.

[0024] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A Bluetooth hearing aid circuit, characterized in that, include: Bluetooth chip module, Hall module and DSP module group; The Hall module is electrically connected to the Bluetooth chip module, and the Bluetooth chip module is electrically connected to the DSP module group; The Bluetooth chip module is connected to the charging input terminal and is electrically connected to the battery, low dropout linear regulator, battery protection module, level conversion module, crystal oscillator, button, antenna and microphone arranged around the Bluetooth chip module. The DSP module group is electrically connected to the low dropout linear regulator, the microphone, the button, the level conversion module and the speaker, and is controlled by the Bluetooth chip module via I2C signal.

2. The Bluetooth hearing aid circuit according to claim 1, characterized in that, The Bluetooth chip module includes a resonant circuit and an RF filter circuit. The DSP module group includes a DSP power supply module and a DSP audio processing module. The DSP power supply module controls the low dropout linear regulator through the Bluetooth chip module.

3. The Bluetooth hearing aid circuit according to claim 2, characterized in that, The DSP power supply module controls the power supply of the DSP audio processing module to be turned on and off via a Bluetooth chip module.

4. A Bluetooth hearing aid circuit according to claim 2, characterized in that, The microphone synchronously transmits the collected audio signals to the DSP audio processing module and the Bluetooth chip module.

5. A Bluetooth hearing aid circuit according to claim 1, characterized in that, The Bluetooth chip module model is AC7006D8.

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