Wearable mobile phone reminding system based on radio frequency detection and Bluetooth information synchronization

Abstract

The invention discloses a wearable mobile phone reminding system based on radio frequency detection and Bluetooth information synchronization, and the system comprises a radio frequency detection module which is used for monitoring an incoming call signal of a mobile phone in an anti-eavesdropping box; the Bluetooth transmission assembly is used for being connected with a mobile phone to realize information interaction; the wearable terminal module is used for being connected with a mobile phone through a Bluetooth transmission assembly to achieve incoming call and notification reminding; the information buffering module is used for monitoring the notification message from the intelligent terminal through the Bluetooth transmission component, synchronizing the service and buffering and displaying the notification message in a queue form; the MCU component is used for carrying out data operation processing on the components; wherein the radio frequency detection module, the Bluetooth component, the wearable terminal module and the information buffer module are electrically connected with the MCU component. The method has the beneficial effects that a user can still know the state and key information of the mobile phone through the bracelet in an anti-monitoring environment; the user experience is not sacrificed while the privacy protection of the mobile phone is enhanced; joint transmission reminding of radio frequency signals and network information is realized; and OTA remote firmware upgrading is supported.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mobile communication and wearable device technology, in particular to a wearable mobile phone reminding system based on radio frequency detection and Bluetooth information synchronization. BACKGROUND

[0002] In recent years, with the rapid development of electronic technology, various digital products with recording function emerge in an endless stream; in some confidential places, criminals use various eavesdropping devices for eavesdropping, and these eavesdropping devices are extremely concealed and difficult to prevent; due to the emergence and wide application of these digital products with recording function and special eavesdropping equipment, enterprises, government departments and even individuals often encounter malicious eavesdropping and recording problems, which seriously infringes on the personal privacy of people and the confidentiality of enterprises and government departments; the common anti-eavesdropping method is to restrict the carrying of eavesdropping devices, but since most of the current mobile phones and other portable digital products have recording function, at the same time, special eavesdropping equipment is extremely concealed and difficult to detect, therefore, this anti-eavesdropping method of restricting the carrying of eavesdropping devices cannot effectively prevent eavesdropping.

[0003] In order to avoid the above situation, people designed an anti-eavesdropping device, when some private topics need to be discussed, the portable digital product can be placed in the anti-eavesdropping device, but the current anti-eavesdropping device generally uses shielding material to shield the radio frequency signal of the mobile phone, although it can achieve the purpose of preventing monitoring, but at the same time, the user cannot timely perceive the mobile phone notification and incoming call, which affects the communication efficiency and cannot meet the use demand of people. SUMMARY

[0004] In order to solve the above technical problems, the present application provides a wearable mobile phone reminding system based on radio frequency detection and Bluetooth information synchronization, comprising:

[0005] A radio frequency detection module is used for monitoring the incoming call signal of the mobile phone in the anti-eavesdropping box;

[0006] A Bluetooth transmission component is used for connecting with the mobile phone to realize information interaction;

[0007] A wearable terminal module is used for connecting with the mobile phone through the Bluetooth transmission component to realize incoming call and notification reminding;

[0008] An information buffer module listens to the notification message from the intelligent terminal through the Bluetooth transmission component and buffers and displays in the form of a queue;

[0009] An MCU component is used for data operation processing of the above components;

[0010] The radio frequency detection module, Bluetooth component, wearable terminal module and information buffer module are electrically connected with the MCU component.

[0011] Further supplement to the technical solution, the incoming call signal monitored in the radio frequency detection module is a GSM rising edge feature or a change in RSSI.

[0012] Further supplement to the technical solution, the call state recognition is through a digital phase-locked loop or an envelope analyzer.

[0013] Further supplement to the technical solution, the Bluetooth transmission component is a low-power wireless transmission module.

[0014] Further supplement to the technical solution, the Bluetooth transmission component adopts a BLE 5.0 protocol stack, is embedded with a Bluetooth SoC, supports a maximum transmission distance of 100 meters, and has a low-delay notification mechanism.

[0015] Further supplement to the technical solution, the wearable terminal module is a bracelet.

[0016] Further supplement to the technical solution, the bracelet is internally provided with an OLED or LCD display screen, and provides icon display and vibration motor reminder functions through low-power MCU control.

[0017] Further supplement to the technical solution, the information buffering module is provided with a Flash memory to ensure power failure protection.

[0018] Further supplement to the technical solution, the Bluetooth transmission component is an nRF52840.

[0019] The beneficial effects are that the user can still understand the phone status and key information through the bracelet in a monitoring-prevention environment, the phone privacy protection is enhanced without sacrificing the user experience, the joint transmission of radio frequency signals and network information is realized, and OTA remote firmware upgrade is supported. DETAILED DESCRIPTION

[0020] In order to make the technical solution more clear to those skilled in the art, the technical solution of the present application will be described in detail below:

[0021] A wearable phone reminder system based on radio frequency detection and Bluetooth information synchronization, comprising:

[0022] A radio frequency detection module for monitoring the incoming call signal of the phone in the anti-eavesdropping box;

[0023] A Bluetooth transmission component for connecting with the phone to realize information interaction;

[0024] A wearable terminal module for connecting with the phone through the Bluetooth transmission component to realize incoming call and notification reminder;

[0025] An information buffering module for listening to the notification message from the intelligent terminal through the Bluetooth transmission component and buffering and displaying in a queue form.

[0026] MCU component for data operation processing of each component above;

[0027] The radio frequency detection module, the Bluetooth component, the wearable terminal module and the information buffer module are electrically connected with the MCU component (such as MSP430 series) and support OTA remote firmware upgrade.

[0028] The incoming call signal in the radio frequency detection module is monitored for GSM rising edge characteristics or RSSI changes; the GSM rising edge has specific waveform requirements and time limitations, and the RSSI (received signal strength indication) changes in the GSM system with factors such as signal propagation environment and distance. The following is a specific introduction:

[0029] GSM rising edge characteristics:

[0030] Waveform characteristics: GSM is a time division multiple access (TDMA) system. In order to meet the requirements of switch spectrum, the rising edge of the burst pulse cannot rise as quickly as a rectangular wave, but must rise slowly according to a certain waveform, usually a cosine signal waveform of 1 / 2 period, and its function expression is y = 1 / 2 - 1 / 2cos(πx), 0≤x≤1.

[0031] Time characteristics: According to the GSM protocol, the rising edge of each burst in any time slot must be completed within 28μs.

[0032] Sampling characteristics: The general rising edge waveform is sampled at 18 points, and each point corresponds to the power control word of the power amplifier (PA) at this time. The 18 PA power control words are the RAMP parameters of the GSM power amplifier.

[0033] The GSM rising edge characteristics are a comprehensive embodiment of time domain, frequency domain and timing characteristics, and its optimization needs to consider signal integrity, anti-interference ability and system synchronization requirements. From hardware design (such as PCB wiring and device selection) to protocol layer control (such as TA mechanism), the precise control of the rising edge is one of the key links for GSM network to realize low bit error rate (BER) and high reliability communication.

[0034] RSSI change in GSM: is a key indicator for measuring the strength of received signals in wireless communication, usually in units of dBm (decibel milliwatt). Its numerical range is generally between -110dBm (very weak signal) and -30dBm (very strong signal), and the closer the value is to 0, the higher the signal strength.

[0035] Relationship with distance: Under normal circumstances, the closer the distance between the mobile phone and the base station, the larger the RSSI value and the stronger the signal strength; the farther the distance, the greater the signal attenuation in the transmission process, the smaller the RSSI value and the weaker the signal strength.

[0036] Environmental influence: The signal can be affected by obstacles such as buildings, terrain, etc. during transmission, resulting in signal attenuation, reflection, refraction, etc. In urban environments with high-rise buildings, signal fading can be more severe, and RSSI values may fluctuate greatly and be generally low. In open areas, signal propagation conditions are better, and RSSI values are relatively stable and large.

[0037] Change over time: Due to the time-varying nature of the wireless channel, such as the movement of objects in the surrounding environment and weather changes, signal multipath effects may change, and RSSI values may fluctuate over time.

[0038] Relationship with base station transmit power: The greater the base station transmit power, the stronger the signal strength received by the mobile phone at the same distance and environment, and the larger the RSSI value; conversely, the smaller the RSSI value.

[0039] Among them, the call state recognition is realized through a digital phase-locked loop or an envelope analyzer.

[0040] Application of digital phase-locked loop (DPLL) in call state recognition

[0041] 1. Technical principle

[0042] A digital phase-locked loop (DPLL) is a closed-loop feedback system implemented through digital circuits, with the core function of tracking the frequency and phase of the input signal. It is mainly composed of the following parts:

[0043] Phase detector (PD): compares the phase difference between the input signal and the local reference signal, and outputs an error signal.

[0044] Loop filter (LPF): filters out high-frequency components in the error signal to generate a smooth control signal.

[0045] Numerically controlled oscillator (NCO): generates a local signal with adjustable frequency and phase according to the control signal, forming a closed-loop feedback.

[0046] 2. Application scenarios in call state recognition

[0047] During the call process, different states correspond to specific audio signal characteristics (such as frequency, period), for example:

[0048] Dial tone: usually a continuous 450Hz single tone signal.

[0049] Busy tone: the domestic standard is an intermittent signal with "450Hz, 0.35s on, 0.35s off".

[0050] Ring tone: such as a periodic signal with "450Hz, 1s on, 4s off".

[0051] DPLL realizes state recognition through the following ways:

[0052] Frequency Locking: Locking the fundamental frequency of the input signal (e.g., 450Hz), determining whether there is a signal of a specific frequency.

[0053] Period Analysis: Identifying the on-off period of the signal (e.g., 0.7 seconds of busy tone) by tracking the phase change of the signal.

[0054] Noise Resistance: The closed-loop system can filter out some noise, improving the stability of the signal in complex environments.

[0055] 3. Implementation Example

[0056] Take busy tone recognition as an example:

[0057] After the input signal is converted into digital, it enters the DPLL, and the phase detector compares its phase with the phase of the 450Hz signal output by the NCO.

[0058] When the signal exists, the DPLL locks the frequency, and at the same time, the counter records the on-off time of the signal (0.35 seconds on, 0.35 seconds off).

[0059] When a frequency signal that meets the busy tone period is detected, it is determined as "busy tone state".

[0060] II. Application of Envelope Analyzer in Call State Recognition

[0061] 1. Technical Principle

[0062] The envelope analyzer is used to extract the amplitude envelope features of the signal, and the core is to obtain the "envelope line" of the signal. Common implementation methods include:

[0063] Rectification Filtering Method: After full-wave rectification of the signal, the high-frequency carrier is filtered out by a low-pass filter, and the amplitude envelope is retained.

[0064] Hilbert Transform Method: The analytic signal is generated by Hilbert transform, and its modulus is the envelope.

[0065] 2. Application Scenario in Call State Recognition

[0066] The amplitude change (envelope) of the call signal contains state characteristics, for example:

[0067] Ring Signal: The amplitude changes in "ring-off" period (e.g., 1 second ring, 4 seconds off).

[0068] Ringback Tone: The domestic standard is "450Hz, 1 second ring, 4 seconds off", and the amplitude envelope presents periodic fluctuations.

[0069] Off-hook / On-hook Instant: The signal amplitude may experience a sudden change (e.g., from signal to no signal).

[0070] Application of envelope analyzer:

[0071] Amplitude jump detection: identify off-hook (sudden rise in signal amplitude) or on-hook (sudden drop in amplitude) state.

[0072] Periodic envelope recognition: determine call state by analyzing the period of the envelope (e.g. 5 second period of a ring).

[0073] Signal presence determination: whether the envelope amplitude exceeds a threshold, used to distinguish between "on call" and "idle" states.

[0074] 3. Implementation example

[0075] Take ring signal recognition as an example:

[0076] The input audio signal is transformed into an analytic signal by Hilbert transform, and the envelope is obtained by calculating the modulus of the analytic signal.

[0077] Threshold detection is performed on the envelope, and when the envelope amplitude changes between "high-low" with a 1-4 second period, it is determined to be a "ringing state".

[0078] Combined with the presence or absence of the envelope, the ring (envelope period) and off-hook (envelope sustained high amplitude) states can be distinguished.

[0079] The Bluetooth transmission component is a low-power wireless transmission module, and the Bluetooth transmission component uses a BLE 5.0 protocol stack and embeds a Bluetooth SoC. Further, the Bluetooth transmission component is an nRF52840. The Bluetooth transmission component supports a maximum transmission distance of 100 meters and has a low-delay notification mechanism.

[0080] In order to facilitate wearing and not affect daily life, the wearable terminal module is a bracelet. The bracelet has an OLED or LCD display screen built-in, and provides icon display and vibration motor reminder functions through low-power MCU control.

[0081] The information buffer module is equipped with a Flash memory to ensure power protection.

[0082] The above technical solution only represents the preferred technical solution of the technical solution of the present application, and some changes made by the person skilled in the art to some parts thereof all embody the principles of the present application and are within the protection scope of the present application.

Claims

1. A wearable mobile phone reminding system based on radio frequency detection and Bluetooth information synchronization, characterized in that, The application relates to an anti-eavesdropping box for a mobile phone, which comprises the following components: a radio frequency detection module for monitoring incoming call signals of the mobile phone in the anti-eavesdropping box; a Bluetooth transmission component for connecting with the mobile phone to realize information interaction; a wearable terminal module for connecting with the mobile phone through the Bluetooth transmission component to realize incoming call and notification reminding; an information buffer module for listening to notification messages from the intelligent terminal through the Bluetooth transmission component and buffering and displaying the notification messages in the form of a queue; an MCU component for data operation and processing of the above components; wherein the radio frequency detection module, the Bluetooth component, the wearable terminal module and the information buffer module are electrically connected with the MCU component.

2. The wearable mobile phone reminding system based on radio frequency detection and Bluetooth information synchronization of claim 1, wherein, The radio frequency detection module monitors the rising edge characteristics or RSSI changes of GSM.

3. The wearable mobile phone reminding system based on radio frequency detection and Bluetooth information synchronization of claim 2, wherein, The call state recognition is realized through a digital phase-locked loop or an envelope analyzer.

4. The wearable mobile phone reminding system based on radio frequency detection and Bluetooth information synchronization of claim 1, wherein, The Bluetooth transmission component is a low-power wireless transmission module.

5. The wearable mobile phone reminding system based on radio frequency detection and Bluetooth information synchronization of claim 4, wherein, The Bluetooth transmission component adopts a BLE 5.0 protocol stack, embeds a Bluetooth SoC, supports a maximum transmission distance of 100 meters and has a low-delay notification mechanism.

6. The wearable mobile phone reminding system based on radio frequency detection and Bluetooth information synchronization of claim 1, wherein, The wearable terminal module is a bracelet.

7. The wearable mobile phone reminding system based on radio frequency detection and Bluetooth information synchronization of claim 6, wherein, The bracelet is provided with an OLED or LCD display screen and a low-power MCU control to provide icon display and vibration motor reminding functions.

8. The wearable mobile phone reminding system based on radio frequency detection and Bluetooth information synchronization of claim 7, wherein, The information buffer module is provided with a Flash memory to ensure power-off protection.

9. The wearable mobile phone reminding system based on radio frequency detection and Bluetooth information synchronization of claim 5, wherein, The Bluetooth transmission component is an nRF52840.