Noise reduction interphone with adaptive environment induction
By utilizing the adaptive environment sensing noise reduction walkie-talkie, the main control module, environment sensing module, and noise reduction processing module work together to solve the problems of noise suppression and high power consumption in complex environments, achieving efficient noise suppression and low-power communication.
Patent Information
- Application Number
- CN202511902302.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-17
- Publication Date
- 2026-02-24
AI Technical Summary
Existing walkie-talkies lack real-time environmental awareness capabilities and cannot intelligently avoid interference sources such as frequency converters and high-power equipment. In terms of hardware, they generally use analog filtering and simple digital processing, which have problems such as fixed frequency band, poor suppression of burst noise, and high power consumption.
A noise-canceling walkie-talkie with adaptive environmental sensing was designed, comprising a main control module, an environmental sensing module, a noise reduction processing module, an audio processing module, an RF module, a storage module, and a power management module. It works in concert with a microphone, speaker, and antenna, and employs FIR digital filters, wavelet transform processors, and digital signal processors for dynamic noise suppression, combined with multi-level power management to optimize power consumption.
It enables automatic identification of noise characteristics in complex environments, provides optimal noise reduction, maintains clear and loud voice, reduces power consumption, and improves communication quality and user experience.
Smart Images
Figure CN121567149A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of walkie-talkie technology, and particularly relates to a noise-reducing walkie-talkie with adaptive environmental sensing. Background Technology
[0002] A walkie-talkie is a two-way mobile communication tool, also known as a two-way radio or wireless walkie-talkie. It is a portable device that can make calls without any network support. It uses the propagation of radio signals in the air to achieve point-to-point or point-to-multipoint communication.
[0003] Existing walkie-talkies mostly use noise reduction algorithms with fixed parameters, which cannot adapt to dynamically changing environmental noise. In industrial manufacturing and other scenarios, the mechanical noise generated by equipment operation is usually between 85-110dB and has obvious time-varying characteristics. Traditional noise reduction technologies based on fixed thresholds or preset filtering parameters are difficult to effectively deal with such dynamic noise environments, resulting in severe distortion of voice signals or noise residue.
[0004] Current products lack the ability to adapt to environmental electromagnetic interference. Broadband electromagnetic interference generated by equipment such as frequency converters and high-power motors is common in modern industrial environments. These interference signals can seriously affect the radio frequency reception performance of walkie-talkies. Although some high-end walkie-talkies have adopted technologies such as frequency hopping, they lack the ability to perceive the electromagnetic environment in real time, and the interference avoidance effect is limited.
[0005] In terms of hardware architecture, traditional noise reduction solutions mainly rely on analog filter circuits and simple digital signal processing, which have the following drawbacks: the analog filter has a fixed frequency band and cannot adapt to different noise spectrum characteristics; the processing algorithm is simple and has poor suppression effect on sudden noise; and there is a lack of coordination with environmental sensors, resulting in a lag in the adjustment of noise reduction strategies.
[0006] Existing technologies are not ideal for dealing with special noises such as wind noise. When used outdoors, changes in wind speed can cause the microphone to generate wind noise of varying intensities. The traditional passive noise reduction method using physical wind shields becomes significantly less effective when the wind speed exceeds 5 m / s.
[0007] In terms of system power consumption, continuous noise reduction processing will significantly shorten battery life, especially in scenarios that require high-intensity noise reduction. Traditional solutions often use the simple method of increasing processing power, which leads to a decrease in device battery life and seriously affects the user experience.
[0008] Traditional walkie-talkies face severe challenges in complex environments. Fixed-parameter noise reduction algorithms struggle to cope with dynamically changing industrial noise and electromagnetic interference, leading to serious degradation in voice quality. Existing walkie-talkies lack real-time environmental awareness and cannot intelligently avoid interference sources such as frequency converters and high-power equipment. In terms of hardware, they generally use analog filtering and simple digital processing, which have defects such as fixed frequency band, poor suppression of sudden noise, and high power consumption, resulting in low stability of walkie-talkies in emergency rescue, industrial sites, and other scenarios. Summary of the Invention
[0009] This invention provides a noise-reducing walkie-talkie with adaptive environmental sensing, aiming to solve the problems of existing walkie-talkies lacking real-time environmental perception capabilities, being unable to intelligently avoid interference sources such as frequency converters and high-power equipment, and generally using analog filtering and simple digital processing in terms of hardware, resulting in fixed frequency bands, poor suppression of burst noise, and high power consumption.
[0010] The present invention is implemented as follows: a noise-reducing walkie-talkie with adaptive environmental sensing includes a walkie-talkie housing, on which a microphone, a speaker and an antenna are provided, and the inner cavity of the walkie-talkie housing is provided with a main control module, an environmental sensing module, a noise reduction processing module, an audio processing module, a radio frequency module, a storage module and a power management module. The power management module provides power to the main control module, the environmental sensing module, the noise reduction module, the audio processing module, the radio frequency module, and the storage module via electrical connections. The main control module interacts with the main control module, the environmental sensing module, the noise reduction module, the audio processing module, the radio frequency module, and the storage module via electrical connections. The audio processing module transmits data with the noise reduction module via electrical connections. The microphone transmits data to the audio processing module via an electrical connection, the audio processing module transmits data to the speaker via an electrical connection, and the radio frequency module interacts with the antenna via an electrical connection.
[0011] Preferably, the main control module includes a main control chip and a clock unit. The clock unit and the main control chip interact with each other via electrical connection. The main control chip interacts with the main control module, the environmental sensing module, the noise reduction processing module, the audio processing module, the radio frequency module, and the storage module via electrical connection.
[0012] Preferably, the environmental sensing module consists of the microphone array, the electromagnetic field strength sensor, and the digital signal processor. The electromagnetic field strength sensor transmits data with the digital signal processor via an electrical connection, and the digital signal processor interacts with the main control module via an electrical connection.
[0013] Preferably, the noise reduction processing module includes an FIR digital filter, a wavelet transform processor, and a digital signal processor. The audio processing module transmits data with the FIR digital filter via an electrical connection. The FIR digital filter transmits data with the wavelet transform processor via an electrical connection. The wavelet transform processor transmits data with the digital signal processor via an electrical connection. The digital signal processor interacts with the main control module via an electrical connection.
[0014] Preferably, the storage module adopts a hierarchical storage architecture. The bottom layer is a high-speed cache area, using static random access memory (SRAM) to temporarily store noise reduction algorithm parameters and real-time environmental sensing data frequently called by the main control module, so as to achieve fast data read and write and ensure the timeliness of system response. The middle layer is a solid-state drive (SSD) storage area, using non-flash memory, to store audio files and system configuration files generated during the operation of the walkie-talkie, as well as data that is not frequently accessed, to meet the needs of long-term use. The top layer is a removable storage interface area, equipped with a standard memory card slot, which supports users to insert external memory cards to expand storage space and facilitate the backup and transfer of audio data.
[0015] Preferably, the walkie-talkie housing adopts a double-layer composite structure, with an outer layer of high-strength plastic housing and an inner layer of metal shielding made of copper alloy. Waterproof silicone sealing rings are provided at the edges and interfaces of the walkie-talkie housing.
[0016] Preferably, the walkie-talkie housing is further provided with a display unit and an operation button unit. The display unit is an LCD screen with a backlight panel inside. The backlight panel is composed of multiple high-brightness light-emitting diodes, which are evenly distributed behind the LCD screen to provide sufficient and uniform backlight for the LCD screen. The operation button unit includes function buttons and navigation buttons. The function buttons are touch switches with conductive rubber inside, and the navigation buttons are rotary encoders.
[0017] Preferably, the FIR digital filter, the wavelet transform processor, and the digital signal processor are all integrated chips. Inside the chip, the FIR digital filter, the wavelet transform processor, and the digital signal processor each have independent arithmetic units and storage units. The arithmetic unit of the FIR digital filter uses a dedicated digital signal processing kernel to quickly execute the FIR filtering algorithm. Its storage unit is used to store the filtering coefficients and intermediate calculation results. The arithmetic unit of the wavelet transform processor has hardware acceleration capabilities for wavelet transform, efficiently performing wavelet decomposition and reconstruction operations. Its storage unit is used to store wavelet basis functions and decomposition coefficients. The arithmetic unit of the digital signal processor is a general-purpose digital signal processing kernel with powerful programming and computing capabilities. It performs comprehensive analysis and optimization of the processing results of the FIR digital filter and the wavelet transform processor. Its storage unit is used to store the final noise reduction parameters and processed audio data. The FIR digital filter, the wavelet transform processor, and the digital signal processor transmit and communicate data through a high-speed internal bus.
[0018] Preferably, the audio processing module adopts a modular design. The audio input section includes the microphone and a preamplifier circuit. The microphone is an electret condenser microphone with an internal acoustic-to-electrical conversion element and impedance matching circuit to convert the sound signal into an electrical signal. The preamplifier circuit uses a low-noise operational amplifier to amplify the weak electrical signal output by the microphone while suppressing noise. The audio output section includes a speaker and a power amplifier circuit. The speaker is a moving-coil speaker with an internal voice coil, magnet, and diaphragm to convert the electrical signal into a sound signal. The power amplifier circuit uses a Class D power amplifier to provide sufficient power to the speaker. The audio processing module is connected to the main control module through a standard interface.
[0019] Preferably, the power management module adopts a multi-level power management architecture. The first level is a power input interface that supports multiple power input methods. The second level is a power conversion circuit that uses a switching power supply chip to convert the input power voltage into a stable voltage required by each module inside the walkie-talkie. The third level is a power distribution circuit that dynamically distributes power according to the working status and power consumption requirements of each module. The power management module also has a power monitoring unit that monitors parameters such as voltage, current, and temperature of the power supply in real time. When an abnormality occurs, it promptly sends an alarm signal to the main control module.
[0020] Beneficial effects Compared with the prior art, the beneficial effects of the present invention are as follows: The noise-reducing walkie-talkie with adaptive environmental sensing of the present invention, through a walkie-talkie composed of a walkie-talkie shell, a main control module, an environmental sensing module, a noise reduction processing module, an audio processing module, a radio frequency module, a storage module, a power management module, a microphone, a speaker and an antenna, can perform coordinated work of environmental perception and intelligent noise reduction. It can automatically identify the noise characteristics of different scenarios such as factories and cities, achieve the best noise reduction effect, and maintain clear and loud voice even in an 85dB industrial noise environment. At the same time, the power consumption is lower than that of traditional walkie-talkies, which significantly improves the communication quality and user experience in complex environments. Attached Figure Description
[0021] Figure 1 This is a three-dimensional structural diagram of the noise-reducing walkie-talkie with adaptive ambient sensing of the present invention; Figure 2 This is a structural block diagram of the noise-reducing walkie-talkie with adaptive ambient sensing of the present invention. Figure 3 This is a structural block diagram of the main control module in this invention; Figure 4 This is a structural block diagram of the environmental sensing module in this invention; Figure 5 This is a structural block diagram of the noise reduction processing module in this invention. Figure 6 This is a schematic block diagram of the noise reduction process in this invention; Figure 7 This is a circuit diagram of the noise reduction processing module in this invention.
[0022] In the diagram: 1. Walkie-talkie casing; 2. Main control module; 3. Environmental sensing module; 4. Noise reduction module; 5. Audio processing module; 6. Radio frequency module; 7. Storage module; 8. Power management module; 9. Microphone; 10. Speaker; 11. Antenna; 12. Main control chip; 13. Clock unit; 14. Electromagnetic field strength sensor; 15. Digital signal processor; 16. FIR digital filter; 17. Wavelet transform processor; 18. Digital signal processor. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.
[0024] Please see Figure 1-5The present invention provides a technical solution: a noise-reducing walkie-talkie with adaptive environmental sensing, including a walkie-talkie housing 1, a microphone 9, a speaker 10 and an antenna 11 disposed on the walkie-talkie housing 1, and a main control module 2, an environmental sensing module 3, a noise reduction processing module 4, an audio processing module 5, a radio frequency module 6, a storage module 7 and a power management module 8 disposed in the inner cavity of the walkie-talkie housing 1.
[0025] The power management module 8 provides power to the main control module 2, the environmental sensing module 3, the noise reduction module 4, the audio processing module 5, the radio frequency module 6, and the storage module 7 via electrical connection. The main control module 2 interacts with the main control module 2, the environmental sensing module 3, the noise reduction module 4, the audio processing module 5, the radio frequency module 6, and the storage module 7 via electrical connection. The audio processing module 5 transmits data with the noise reduction module 4 via electrical connection.
[0026] Microphone 9 transmits data to audio processing module 5 via electrical connection. Audio processing module 5 transmits data to speaker 10 via electrical connection. Radio frequency module 6 interacts with antenna 11 via electrical connection. Audio processing module 5 supports dynamic frequency adjustment.
[0027] The walkie-talkie, consisting of a casing 1, a main control module 2, an environmental sensing module 3, a noise reduction module 4, an audio processing module 5, a radio frequency module 6, a storage module 7, a power management module 8, a microphone 9, a speaker 10, and an antenna 11, can perform coordinated work of environmental perception and intelligent noise reduction. It can automatically identify the noise characteristics of different scenarios such as factories and cities, achieve optimal noise reduction effect, and maintain clear and loud voice even in an 85dB industrial noise environment. At the same time, its power consumption is lower than that of traditional walkie-talkies, significantly improving communication quality and user experience in complex environments.
[0028] The main control chip 12 uses U1 (SCT3288TD) as the main processor and IC1 (GD32F303VET6) as the coprocessor. The two exchange data and coordinate control through the SPI bus (S_SPI, M_SPI) and the I2C bus (I2C_SCL, I2C_SDA). The clock unit 13 contains the main clock and the RTC clock. O7 is connected to the main control module 2 through the SPI bus.
[0029] RF Module 6 (RFTransceiver) Core IC: U11 (BK4829) - Integrated RF transceiver chip, front-end path: includes antenna switch, multi-stage filter, power amplifier, low noise amplifier, etc., reference clock: T2 (26MHz), T3 (19.2MHz).
[0030] Audio Processing Module 5 (AudioProcessing) Core IC: U17 (ES8389) - High-performance audio codec; Audio power amplifier: U8 (NJM2904V) - Operational amplifier for audio output drive; Microphone circuit: Includes bias, amplification and mute control (such as Q5, Q6, Q7, Q8, etc.).
[0031] Power Management Module 8 (PowerManagement) LDO regulator: U5 (SGM2036-1.8V), U6 (SGM2036-1.2V) - provides clean power to the core chip; Charging management: U2 (SGM4157) - USB charging chip; DC-DC converter: composed of peripheral circuits (such as L1, C26, etc.) for high-efficiency power conversion.
[0032] The main control module 2 includes a main control chip 12 and a clock unit 13. The clock unit 13 and the main control chip 12 interact with each other through an electrical connection. The main control chip 12 interacts with the main control module 2, the environmental sensing module 3, the noise reduction processing module 4, the audio processing module 5, the radio frequency module 6, and the storage module 7 through an electrical connection. The main control chip 12 uses an adaptive algorithm to analyze environmental characteristic parameters and dynamically adjust the noise reduction strategy.
[0033] The environmental sensing module 3 consists of a microphone array 9, an electromagnetic field strength sensor 14, and a digital signal processor 15. The electromagnetic field strength sensor 14 transmits data to the digital signal processor 15 via an electrical connection, and the digital signal processor 15 interacts with the main control module 2 via an electrical connection to collect environmental noise and electromagnetic interference data in real time.
[0034] The noise reduction processing module 4 includes an FIR digital filter 16, a wavelet transform processor 17, and a digital signal processor 18. The audio processing module 5 transmits data with the FIR digital filter 16 via an electrical connection. The FIR digital filter 16 transmits data with the wavelet transform processor 17 via an electrical connection. The wavelet transform processor 17 transmits data with the digital signal processor 18 via an electrical connection. The digital signal processor 18 interacts with the main control module 2 via an electrical connection to achieve multi-level noise suppression.
[0035] The entire system uses the MCU (GD32F303VET6) as its core hub, controlling all peripheral modules through various buses: (1) MCU↔RF chip (BK4829) Control interface: SPI (SCK, SDATA, SCN) is used to configure all registers of BK4829.
[0036] Data interface: I2S (BCLK, LRCLK, DI, DO) is used to transmit digital audio streams.
[0037] Control signals: GPIO (such as GPIO0-GPIO6) are used to control RF front-end switching, squelch, etc.
[0038] Interrupt signal: The INT signal notifies the MCU of a state change in the RF chip.
[0039] (2) MCU↔ Audio codec Control interface: I2C (SCL, SDA) is used to configure the audio parameters of ES8389 (gain, volume, channel selection, etc.).
[0040] Data interface: I2S (BCLK, LRCLK, RXDAT, TXDAT) is used to receive and send audio data.
[0041] Master clock: MCLK is provided by the MCU or a dedicated clock source and serves as the reference clock for I2S.
[0042] (3) MCU ↔ External devices SPIFlash: Uses SPI (F_SCK, F_MOSI, F_MISO, F_CS) interfaces for program storage and retrieval.
[0043] Display driver: Controls the TM1652 to drive the LED via I2C (LED_SDA, SCL).
[0044] Keypad: Scan the keyboard matrix via GPIO ports to detect key presses.
[0045] (4) Radio frequency front end ↔ Antenna The antenna signal is switched between transmit and receive states via antenna switches (Q1, Q2).
[0046] Transmission path: BK4829 -> Filter -> Power Amplifier (PA) Q3 -> Antenna Switch -> Antenna.
[0047] Receive path: Antenna -> Antenna switch -> Filter -> Low noise amplifier (LNA) (inside BK4829) -> BK4829 demodulation.
[0048] (5) Audio input / output Microphone input: Microphone -> Audio bias circuit -> ES8389 (ADC) -> Converted into a digital signal and sent to MCU / BK4829 via I2S.
[0049] Audio output: BK4829 / MCU sends digital audio via I2S -> ES8389 (DAC) -> converts to analog signal -> audio amplifier U8 -> speaker.
[0050] (6) Power Management The battery voltage VBAT is input, and the battery is charged via the charging management U2.
[0051] VBAT supplies power to DC-DC converters and LDOs (U5, U6), generating various stable voltages required by the system (such as D3V0, M3V0, VOUT_1V2, VOUT_3V0, IG_1V2, IG_1V8, etc.) to power each module.
[0052] Storage module 7 adopts a hierarchical storage architecture. The bottom layer is a high-speed cache area, which uses static random access memory to temporarily store noise reduction algorithm parameters and real-time environmental sensing data that are frequently called by the main control module 2, so as to achieve fast data read and write and ensure the timeliness of system response. The middle layer is a solid-state drive storage area, which uses non-flash memory to store audio files and system configuration files generated during the operation of the walkie-talkie, as well as data that is not frequently accessed, to meet the needs of long-term use. The top layer is a removable storage interface area, which is equipped with a standard memory card slot to support users to insert external memory cards to expand storage space and facilitate the backup and transfer of audio data.
[0053] The walkie-talkie housing 1 adopts a double-layer composite structure. The outer layer is a high-strength plastic housing, and the inner layer is a metal shielding layer made of copper alloy. Waterproof silicone sealing rings are provided at the edges and interfaces of the walkie-talkie housing 1.
[0054] The walkie-talkie housing 1 is also equipped with a display unit and an operation button unit. The display unit uses an LCD screen and has a backlight panel inside. The backlight panel is composed of multiple high-brightness light-emitting diodes, which are evenly distributed behind the LCD screen to provide sufficient and uniform backlight for the LCD screen. The operation button unit includes function buttons and navigation buttons. The function buttons use touch switches and have conductive rubber inside. The navigation buttons use a rotary encoder.
[0055] The FIR digital filter 16, wavelet transform processor 17, and digital signal processor 18 are all integrated chips. Inside the chip, each of these components has its own independent arithmetic and storage units. The arithmetic unit of the FIR digital filter 16 uses a dedicated digital signal processing core to quickly execute the FIR filtering algorithm. Its storage unit is used to store the filtering coefficients and intermediate calculation results. The arithmetic unit of the wavelet transform processor 17 has hardware acceleration capabilities for wavelet transform, efficiently performing wavelet decomposition and reconstruction operations. Its storage unit is used to store the wavelet basis functions and decomposition coefficients. The arithmetic unit of the digital signal processor 18 is a general-purpose digital signal processing core with powerful programming and computing capabilities. It performs comprehensive analysis and optimization of the processing results of the FIR digital filter 16 and the wavelet transform processor 17. Its storage unit is used to store the final noise reduction parameters and the processed audio data. The FIR digital filter 16, wavelet transform processor 17, and digital signal processor 18 communicate and transmit data through a high-speed internal bus.
[0056] The audio processing module 5 adopts a modular design. The audio input section includes a microphone 9 and a preamplifier circuit. The microphone 9 is an electret condenser microphone with an internal acoustic-to-electrical conversion element and impedance matching circuit to convert the sound signal into an electrical signal. The preamplifier circuit uses a low-noise operational amplifier to amplify the weak electrical signal output by the microphone while suppressing noise. The audio output section includes a speaker 10 and a power amplifier circuit. The speaker is a moving-coil speaker with an internal voice coil, magnet, and diaphragm to convert the electrical signal into a sound signal. The power amplifier circuit uses a Class D power amplifier to provide sufficient power to the speaker. The audio processing module 5 is connected to the main control module 2 through a standard interface.
[0057] The power management module 8 adopts a multi-level power management architecture. The first level is the power input interface, which supports multiple power input methods. The second level is the power conversion circuit, which uses a switching power supply chip to convert the input power voltage into the stable voltage required by each module inside the walkie-talkie. The third level is the power distribution circuit, which dynamically distributes power according to the working status and power consumption requirements of each module. The power management module 8 is also equipped with a power monitoring unit, which monitors the voltage, current and temperature of the power supply in real time. When an abnormal situation occurs, it promptly sends an alarm signal to the main control module 2.
[0058] Please see Figure 6The radio frequency signal in the air is received by the antenna and switched to the receiving path by the antenna switch. The signal passes through a series of bandpass filters (such as L2, L4, L6, L7, L8, L9, etc.) to filter out out-of-band interference. The clean radio frequency signal enters the BK4829, is amplified by the internal low noise amplifier (LNA), and then mixed and demodulated to obtain a digital audio stream (I2S format). This digital audio is transmitted to the MCU through the I2S bus. The MCU can perform additional digital signal processing (such as decryption and noise reduction). The processed digital audio is then sent to the ES8389 through another I2S channel for digital-to-analog conversion (DAC). The generated analog audio signal is amplified by the operational amplifier U8 and drives the speaker to emit sound.
[0059] Please see Figure 7 When a user presses and holds the PTT button to speak, the sound is picked up by the microphone and converted into an analog electrical signal. The analog signal is then sent to the ES8389 for analog-to-digital conversion (ADC) to obtain a digital audio stream (I2S format). The digital audio is transmitted to the MCU via I2S. The MCU processes the audio (e.g., encryption, pre-emphasis) and then sends it to the BK4829 via I2S. The BK4829 modulates the audio data onto a specified carrier frequency to generate an RF signal. This RF signal is amplified by the power amplifier Q3 to achieve sufficient transmission power. The amplified signal is then filtered to remove harmonic impurities and finally switched to the transmission path via the antenna switch, where it is radiated by the antenna.
[0060] Part 1: Receive Path (RXPath) - From Antenna to Speaker 1. Antenna reception and preliminary filtering Input: Airborne electromagnetic wave signal.
[0061] Modules: Antenna (ANT3) and RF front-end switch / filter network.
[0062] Processing: The antenna converts electromagnetic waves into weak electrical signals. The signal first passes through the antenna switch consisting of Q1 and Q2 (HTU7G06S), at which point the switch is in the receive (RX) state. Subsequently, the signal passes through a complex multi-stage filter network (containing numerous inductors and capacitors such as L2, L4, L6, L7, L8, L9, C93, C94, C105, C107, C108, C110, and C111) to filter out out-of-band interference and noise, allowing only signals in the target frequency band to pass through.
[0063] Transmission: The purified RF signal is sent to the next module through the LNAIN pin.
[0064] 2. Low-noise amplification and frequency conversion demodulation Input: A weak, filtered radio frequency signal.
[0065] Module: Receive channel for RF chip (U11, BK4829).
[0066] deal with: Low-noise amplifier (LNA): The signal is first amplified inside the BK4829 to compensate for the loss in subsequent processing, while generating as little noise as possible.
[0067] Mixing and demodulation: The amplified signal is mixed with the local oscillator signal generated by the frequency synthesizer inside the chip, down-converted to intermediate frequency (IF) or directly converted to baseband I / Q signal, and finally demodulated to produce a digital audio stream containing audio information.
[0068] Signal strength and noise detection: The chip's internal circuitry generates RSSI (Received Signal Strength Indicator) and SQL (Squelch) signals in real time.
[0069] transmission: Main path (digital audio): The demodulated digital audio stream is output through the I2S bus (I2S_BCLK, I2S_LRCLK, I2S0_TXDAT).
[0070] Auxiliary path (control signals): RSSI and SQL signals are read by the MCU via ADC or GPIO.
[0071] 3. Digital Signal Processing and Routing Input: Digital audio stream (I2S format), RSSI / SQL signal.
[0072] Module: Main control MCU (IC1, GD32F303VET6).
[0073] deal with: The MCU controls the frequency and mode of the BK4829 via the SPI bus.
[0074] Receive I2S audio data from BK4829.
[0075] MCUs can perform digital processing on audio data, such as decryption, digital filtering, noise reduction, and volume adjustment.
[0076] The MCU determines whether to enable audio output based on the SQL signal to identify a valid signal.
[0077] Transmission: The processed digital audio data is sent to the audio codec via another I2S bus (I2S_BCLK, I2S_LRCLK, I2S1_TXDAT).
[0078] 4. Digital-to-analog conversion and audio amplification Input: Processed digital audio stream (I2S format).
[0079] Modules: Audio codec (U17, ES8389) and audio amplifier (U8, NJM2904V).
[0080] deal with: ES8389: Receives I2S data from the MCU, performs digital-to-analog conversion (DAC), and restores it to an analog audio signal.
[0081] NJM2904V: Amplifies analog audio signals to make them capable of driving speakers.
[0082] Transmission: The amplified analog audio signal is sent to the speaker (SPK).
[0083] 5. Output Module: Speaker.
[0084] Processing: Converting electrical signals into sound waves.
[0085] Output: The sound heard by the user.
[0086] Part Two: Transmit Path (TXPath) - From Microphone to Antenna 1. Audio Acquisition and Amplification Input: The user's voice.
[0087] Module: Microphone (MIC) and preamplifier circuit (composed of Q5, Q6, Q7, Q8, etc.).
[0088] Processing: The microphone converts sound waves into weak electrical signals. This signal is then amplified and conditioned by a preamplifier.
[0089] Transmission: The amplified analog audio signal is sent to the audio codec (ES8389).
[0090] 2. Analog-to-digital conversion Input: Analog audio signal.
[0091] Module: Audio codec (U17, ES8389).
[0092] Processing: The ES8389 performs analog-to-digital conversion (ADC) on analog audio signals, converting them into digital audio streams.
[0093] Transmission: The digital audio stream is sent to the MCU via the I2S bus (I2S_BCLK, I2S_LRCLK, I2S1_RXDAT).
[0094] 3. Digital Processing and Modulation Input: Digital audio stream (I2S format).
[0095] Modules: Main control MCU (IC1, GD32F303VET6) and RF chip (U11, BK4829).
[0096] deal with: The MCU receives audio data and can perform processing such as encryption, pre-emphasis, and amplitude limiting.
[0097] The processed data is sent to BK4829 via the I2S bus.
[0098] The BK4829 modulates audio data onto the local oscillator frequency set by the MCU to generate an radio frequency signal.
[0099] Transmission: The modulated radio frequency signal is output from the PAOUT pin.
[0100] 4. Power Amplification and Transmit Filtering Input: Low-power modulated radio frequency signal.
[0101] Modules: Power amplifiers (Q3, 2SC5066) and transmit filters (L12, C119, etc.).
[0102] deal with: Power amplification: The signal is amplified by Q3 to achieve sufficient transmission power.
[0103] Filtering: The amplified signal is passed through a filter to remove harmonics and other stray components, thus meeting regulatory requirements.
[0104] APC control: The MCU controls the output power of the power amplifier through the PA_APC signal.
[0105] Transmission: A clean, high-power radio frequency signal passes through the antenna switches (Q1, Q2), which are in the transmit (TX) state.
[0106] 5. Radiation Module: Antenna (ANT3).
[0107] Processing: The antenna converts radio frequency electrical signals into electromagnetic waves.
[0108] Output: Radiation of electromagnetic wave signals into the air.
[0109] Part Three: Control & Auxiliary Processes User interaction: Buttons (K1-K4, PTT, etc.): are scanned by the MCU's GPIO port. After the MCU detects the button action, it executes the corresponding function (such as switching channels or starting transmission).
[0110] Display (U3, TM1652): The MCU sends display data to the driver chip via the I2C bus (LED_SDA, SCL) to drive the LCD to display information.
[0111] Power Management: The entire system is powered by a power management module (multiple LDOs such as U304, U306, U307, etc.), providing a stable and clean power supply for different modules such as MCU, RF, and audio.
[0112] The MCU monitors the battery voltage (BAT_DET) and temperature (TEMP_DET) via the ADC.
[0113] Clock synchronization: T1 (19.2MHz) and Y2 (32.768kHz) provide the main clock and low-speed clock for the MCU.
[0114] T2 (26MHz) and T3 (19.2MHz) provide a precise reference clock for the RF chip BK4829.
[0115] The working principle and usage process of this invention: After installation, the walkie-talkie, consisting of a casing 1, a main control module 2, an environmental sensing module 3, a noise reduction processing module 4, an audio processing module 5, a radio frequency module 6, a storage module 7, a power management module 8, a microphone 9, a speaker 10, and an antenna 11, can perform coordinated work of environmental perception and intelligent noise reduction. It can automatically identify the noise characteristics of different scenarios such as factories and cities, achieve optimal noise reduction effect, and maintain clear and loud voice even in an 85dB industrial noise environment. At the same time, the power consumption is lower than that of traditional walkie-talkies, significantly improving the communication quality and user experience in complex environments.
[0116] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A noise-reducing walkie-talkie with adaptive ambient sensing, comprising a walkie-talkie housing (1), characterized in that: The walkie-talkie housing (1) is provided with a microphone (9), a speaker (10) and an antenna (11), and the inner cavity of the walkie-talkie housing (1) is provided with a main control module (2), an environmental sensing module (3), a noise reduction processing module (4), an audio processing module (5), a radio frequency module (6), a storage module (7) and a power management module (8). The power management module (8) provides power to the main control module (2), the environmental sensing module (3), the noise reduction processing module (4), the audio processing module (5), the radio frequency module (6), and the storage module (7) via electrical connection. The main control module (2) interacts with the main control module (2), the environmental sensing module (3), the noise reduction processing module (4), the audio processing module (5), the radio frequency module (6), and the storage module (7) via electrical connection. The audio processing module (5) transmits data with the noise reduction processing module (4) via electrical connection. The microphone (9) transmits data to the audio processing module (5) via an electrical connection, the audio processing module (5) transmits data to the speaker (10) via an electrical connection, and the radio frequency module (6) interacts with the antenna (11) via an electrical connection.
2. A noise-reducing walkie-talkie with adaptive environmental sensing as described in claim 1, characterized in that: The main control module (2) includes a main control chip (12) and a clock unit (13). The clock unit (13) and the main control chip (12) interact with each other through an electrical connection. The main control chip (12) interacts with the main control module (2), the environmental sensing module (3), the noise reduction processing module (4), the audio processing module (5), the radio frequency module (6), and the storage module (7) through an electrical connection.
3. A noise-reducing walkie-talkie with adaptive environmental sensing as described in claim 1, characterized in that: The environmental sensing module (3) consists of the microphone (9) array, the electromagnetic field strength sensor (14) and the digital signal processor (15). The electromagnetic field strength sensor (14) transmits data with the digital signal processor (15) through an electrical connection, and the digital signal processor (15) interacts with the main control module (2) through an electrical connection.
4. A noise-reducing walkie-talkie with adaptive environmental sensing as described in claim 1, characterized in that: The noise reduction processing module (4) includes an FIR digital filter (16), a wavelet transform processor (17), and a digital signal processor (18). The audio processing module (5) transmits data with the FIR digital filter (16) via an electrical connection. The FIR digital filter (16) transmits data with the wavelet transform processor (17) via an electrical connection. The wavelet transform processor (17) transmits data with the digital signal processor (18) via an electrical connection. The digital signal processor (18) interacts with the main control module (2) via an electrical connection.
5. A noise-reducing walkie-talkie with adaptive environmental sensing as described in claim 1, characterized in that: The storage module (7) adopts a hierarchical storage architecture. The bottom layer is a high-speed cache area, which uses static random access memory to temporarily store the noise reduction algorithm parameters and real-time environmental sensing data frequently called by the main control module (2) to achieve fast data reading and writing and ensure the timeliness of system response. The middle layer is a solid-state drive storage area, which uses non-flash memory to store audio files and system configuration files generated during the operation of the walkie-talkie and data that is not frequently accessed, to meet the needs of long-term use. The top layer is a removable storage interface area, which is equipped with a standard memory card slot to support users to insert external memory cards to expand storage space and facilitate the backup and transfer of audio data.
6. A noise-reducing walkie-talkie with adaptive environmental sensing as described in claim 1, characterized in that: The walkie-talkie housing (1) adopts a double-layer composite structure. The outer layer is a high-strength plastic housing, and the inner layer is a metal shielding layer made of copper alloy. Waterproof silicone sealing rings are provided at the edges and interfaces of the walkie-talkie housing (1).
7. A noise-reducing walkie-talkie with adaptive environmental sensing as described in claim 1, characterized in that: The walkie-talkie housing (1) is also provided with a display unit and an operation button unit. The display unit is an LCD screen with a backlight panel inside. The backlight panel is composed of multiple high-brightness light-emitting diodes, which are evenly distributed behind the LCD screen to provide sufficient and uniform backlight for the LCD screen. The operation button unit includes function buttons and navigation buttons. The function buttons are touch switches with conductive rubber inside. The navigation buttons are rotary encoders.
8. A noise-reducing walkie-talkie with adaptive ambient sensing as described in claim 4, characterized in that: The FIR digital filter (16), the wavelet transform processor (17), and the digital signal processor (18) are all integrated chips. Inside the chip, the FIR digital filter (16), the wavelet transform processor (17), and the digital signal processor (18) each have independent operation units and storage units. The operation unit of the FIR digital filter (16) uses a dedicated digital signal processing kernel to quickly execute the FIR filtering algorithm. Its storage unit is used to store the filtering coefficients and intermediate operation results. The operation unit of the wavelet transform processor (17) has hardware acceleration function for wavelet transform. The digital signal processor (18) performs wavelet decomposition and reconstruction operations efficiently. Its storage unit is used to store wavelet basis functions and decomposition coefficients. The operation unit of the digital signal processor (18) is a general-purpose digital signal processing kernel with powerful programming and computing capabilities. It performs comprehensive analysis and optimization on the processing results of the FIR digital filter (16) and the wavelet transform processor (17). Its storage unit is used to store the final noise reduction parameters and processed audio data. The FIR digital filter (16), the wavelet transform processor (17) and the digital signal processor (18) transmit data and communicate with each other through a high-speed internal bus.
9. A noise-reducing walkie-talkie with adaptive environmental sensing as described in claim 1, characterized in that: The audio processing module (5) adopts a modular design. The audio input section includes the microphone (9) and the preamplifier circuit. The microphone (9) is an electret condenser microphone with an internal acoustic-to-electrical conversion element and impedance matching circuit to convert the sound signal into an electrical signal. The preamplifier circuit uses a low-noise operational amplifier to amplify the weak electrical signal output by the microphone while suppressing noise. The audio output section includes a loudspeaker (10) and a power amplifier circuit. The loudspeaker is a moving-coil loudspeaker with an internal voice coil, magnet, and diaphragm to convert the electrical signal into a sound signal. The power amplifier circuit uses a Class D power amplifier to provide sufficient power to the loudspeaker. The audio processing module (5) is connected to the main control module (2) through a standard interface.
10. A noise-reducing walkie-talkie with adaptive environmental sensing as described in claim 1, characterized in that: The power management module (8) adopts a multi-level power management architecture. The first level is the power input interface, which supports multiple power input methods. The second level is the power conversion circuit, which uses a switching power supply chip to convert the input power voltage into the stable voltage required by each module inside the walkie-talkie. The third level is the power distribution circuit, which dynamically distributes power according to the working status and power consumption requirements of each module. The power management module (8) is also equipped with a power monitoring unit, which monitors the voltage, current and temperature of the power supply in real time. When an abnormal situation occurs, it promptly sends an alarm signal to the main control module (2).