CN117978189A

CN117978189A - Low-power consumption wake-up circuit, receiver, wake-up sequence transmitting method and electronic equipment

Info

Publication number: CN117978189A
Application number: CN202211328746.6A
Authority: CN
Inventors: 黄清华; 刘抒民; 孙晓宇; 龚卫林; 刘京松; 左成杰
Original assignee: University of Science and Technology of China USTC; Honor Device Co Ltd
Current assignee: University of Science and Technology of China USTC; Honor Device Co Ltd
Priority date: 2022-10-26
Filing date: 2022-10-26
Publication date: 2024-05-03
Also published as: WO2024087861A1

Abstract

The application relates to the technical field of communication, and provides a low-power consumption wake-up circuit, a receiver, a wake-up sequence sending method and electronic equipment, wherein the low-power consumption wake-up circuit comprises: the at least one narrow-band filter corresponds to the at least one low-power-consumption receiving path one by one; the first narrow-band filter is respectively connected with the antenna and a first low-power-consumption path corresponding to the first narrow-band filter, the first narrow-band filter is any one of at least one narrow-band filter, and the first low-power-consumption path is one of a low-power-consumption receiving path. The low-power consumption wake-up circuit has the characteristics of interference resistance, low delay and low power consumption.

Description

Low-power consumption wake-up circuit, receiver, wake-up sequence transmitting method and electronic equipment

Technical Field

The present application relates to the field of communications technologies, and in particular, to a low power consumption wake-up circuit, a receiver, a wake-up sequence sending method, and an electronic device.

Background

With the development of terminal technology, wearable devices such as bluetooth headsets and smart watches are increasingly used in the production and life of people. Wearable devices often require a network connection to be established with a cell phone for use. Taking a Bluetooth headset as an example, the Bluetooth headset plays an audio file of the mobile phone by establishing Bluetooth connection with the mobile phone. In general, a bluetooth headset may be in a standby state when not in use. In the standby state, the Bluetooth headset can still monitor the broadcast signals of the mobile phone. When the Bluetooth headset monitors the broadcast signal issued by the paired mobile phone, the Bluetooth headset can be switched to a working state, and network connection is established with the mobile phone for use.

On the other hand, wearable devices often use small-volume batteries, such as button cells, due to volume limitations. The battery capacity of the small-volume battery is smaller, so that the standby time length of the wearable device can be shortened due to the fact that the standby power consumption of the wearable device is too large, and the user experience is affected. In order to reduce standby power consumption, a conventional manner is to monitor a broadcast signal of a mobile phone by setting a wake-up circuit with lower power consumption, and simultaneously set a main chip (e.g., a bluetooth chip) in a sleep state. When the wake-up circuit monitors the broadcast signal issued by the paired mobile phone, the main chip can be waken up so as to establish network connection.

However, the frequency of the broadcast signal received by the wake-up circuit will generally multiplex the existing communication frequency, and thus is easy to be interfered, so that the receiver cannot normally receive and recognize the broadcast signal carrying the wake-up sequence, and the communication quality between the devices is affected.

Disclosure of Invention

The application provides a low-power consumption wake-up circuit, a receiver, a wake-up sequence sending method, a device, electronic equipment, a computer readable storage medium and a computer program product, which have strong anti-interference capability and ensure the communication quality between equipment.

In a first aspect, a low power wake-up circuit is provided, for use in a receiver, the low power wake-up circuit comprising: the at least one narrow-band filter corresponds to the at least one low-power-consumption receiving path one by one; the first narrow-band filter is respectively connected with the antenna and a first low-power-consumption path corresponding to the first narrow-band filter, the first narrow-band filter is any one of at least one narrow-band filter, and the first low-power-consumption path is one of a low-power-consumption receiving path.

The passband bandwidth of the narrow-band filter is very narrow, so that the interference signals of the narrow-band filter can be greatly reduced, the narrow-band filter can filter most of the interference signals, the anti-interference capability of the low-power consumption wake-up circuit is improved, the wake-up success rate of the wake-up main chip and the main receiving channel is improved, and the communication quality is further improved. Compared with the scheme with low duty ratio, the delay is lower, the timeliness of outputting the wake-up signal is higher under the condition of ensuring low standby power consumption, the condition of untimely wake-up is avoided, and the user experience is improved.

The main reception path may be a separate reception path or a path compatible with the transmission path, and is not limited to this, as long as it is a path capable of realizing the reception function.

In some possible implementations, at least one low-power receiving path is configured to output a wake-up signal when a wake-up sequence carried by a signal received by the antenna matches a preset sequence.

The wake-up signal may be used to wake up a main chip of a communication module where the receiver is located, for example, a bluetooth chip, a WIFI chip, etc. Active devices on the main receive path, such as radio frequency low noise amplifiers, VCOs, etc., may also be awakened. In some implementations, after the wake-up signal wakes up the master chip, the master chip controls active devices on the master receive path to switch from sleep mode to normal operating state.

The low-power consumption wake-up circuit can be always in a receiving state because the standby power consumption of the low-power consumption wake-up circuit is low, and at the moment, the main chip can be in a dormant state, so that the standby power consumption of the equipment can be reduced. The low-power consumption wake-up circuit always monitors the broadcast signal, and when the wake-up sequences are matched, the wake-up signal can be output to the main chip to wake up the main chip and the main receiving channel to be switched from the dormant state to the working state. The low-power consumption wake-up circuit comprises the narrow-band filter and the low-power consumption receiving path, and the narrow-band filter has a narrower passband, so that interference signals with frequencies outside the passband can be effectively filtered, the anti-interference capability of the low-power consumption wake-up circuit is improved, and the accuracy of waking up the main chip and the main receiving path is improved. Compared with the scheme with low duty ratio, the delay is lower, the timeliness of outputting the wake-up signal is higher under the condition of ensuring low standby power consumption, the condition of untimely wake-up is avoided, and the user experience is improved.

In some possible implementations, the first narrowband filter includes: a higher harmonic bulk acoustic resonator and a bandpass filter;

The high-order harmonic bulk acoustic wave resonator is respectively connected with the antenna and the band-pass filter, and the band-pass filter is connected with the first low-power-consumption receiving path; or the band-pass filter is respectively connected with the antenna and the higher harmonic bulk acoustic wave resonator, and the higher harmonic bulk acoustic wave resonator is connected with the first low-power-consumption receiving path.

The first narrowband filter, comprising a combination of a bandpass filter and a higher-harmonic bulk acoustic wave resonator, is an ultra-narrowband filter. The higher harmonic bulk acoustic wave resonance is a resonator having a frequency response curve with a plurality of repeated narrow peaks, one or more of which, i.e. one or more resonant frequency waves, can be switched on from the plurality of repeated narrow peaks of the higher harmonic bulk acoustic wave resonator by providing a bandpass filter. When the band-pass filter and the higher harmonic bulk acoustic wave resonator are connected in series, the center frequency of the passband of the band-pass filter is close to one of the resonant frequencies of the higher harmonic bulk acoustic wave resonators, namely one of the resonant frequencies of the higher harmonic bulk acoustic wave resonators falls in the passband of the band-pass filter, so that signals of the resonant frequency can be gated, signals of other resonant frequencies are restrained, and the ultra-narrow band filtering function is realized.

In some possible implementations, the interval between any two adjacent resonant frequencies of the higher harmonic bulk acoustic wave resonator ranges from 10MHz to 100MHz, the bandwidth of the resonant frequency of the higher harmonic bulk acoustic wave resonator ranges from 50KHz to 1000KHz, and the difference between the passband bandwidth of the bandpass filter and the interval between any two adjacent resonant frequencies of the higher harmonic bulk acoustic wave resonator is less than a preset difference.

The difference between the passband bandwidth of the bandpass filter and the interval between any two adjacent resonant frequencies of the higher harmonic bulk acoustic wave resonator is smaller than a preset difference value, which means that the difference between the passband bandwidth of the bandpass filter and the interval between any two adjacent resonant frequencies is smaller, so that the bandpass filter can gate a signal of one resonant frequency of the higher harmonic bulk acoustic wave resonator, most of interference signals are filtered, ultra-narrow band filtering is realized, and the anti-interference capability of a low-power consumption wake-up circuit is improved.

In some possible implementations, the first low power receive path includes: the device comprises a mixer, an intermediate frequency filter, an analog-to-digital conversion circuit and a correlator; the mixer is used for carrying out self-mixing on the wake-up signal filtered by the first narrow-band filter and transmitting a signal generated by the self-mixing to the intermediate frequency filter; the intermediate frequency filter is used for filtering the signals output by the mixer and transmitting intermediate frequency analog signals obtained by filtering to the analog-to-digital conversion circuit; the analog-to-digital conversion circuit is used for converting the intermediate frequency analog signal into a digital signal and transmitting the digital signal to the correlator; and the correlator is used for comparing the wake-up sequence carried by the digital signal with a preset sequence and outputting a first matching result.

After the broadcast signal passes through the narrow-band intermediate frequency filter, the broadcast signal can be divided into two paths to respectively enter a local oscillator port and a radio frequency port of the mixer to carry out self-mixing, and the broadcast signal after self-mixing is output by the intermediate frequency port of the mixer and filtered by the intermediate frequency filter 2 for multiple times to obtain an intermediate frequency analog signal. The intermediate frequency analog signal enters an analog-to-digital conversion circuit to carry out analog-to-digital conversion, and a digital signal is obtained. The digital signal enters a correlator for decoding to obtain a wake-up sequence. The correlator compares the decoded wake-up sequence with a preset sequence stored in the correlator and outputs a first matching result. If the wake-up sequence is matched with the preset sequence, a wake-up signal can be output as a first matching result, and the wake-up signal can be at a high level; if the wake-up sequence is not matched with the preset sequence, the wake-up signal is not output, or a low level is output as a first matching result, so that the accurate decoding of the wake-up sequence is realized.

In some possible implementations, the first low power receive path further includes: the low-noise amplifier, the analog-to-digital conversion circuit is a comparator; the low-noise amplifier is used for amplifying the intermediate-frequency analog signals; and the comparator is used for converting the filtered and amplified intermediate frequency analog signals into digital signals.

The low-noise amplifier is added to amplify the intermediate frequency signal and ensure higher signal to noise ratio, so that the accuracy of the learned wake-up sequence is ensured, and the wake-up success rate is improved.

In some possible implementations, the number of the at least one low power consumption receiving paths is a plurality, and the circuit further includes: a voting circuit; and the voting circuit is used for outputting a wake-up signal according to the first matching results output by the correlators of the plurality of low-power-consumption receiving paths.

In some possible implementations, the voting circuit is an or gate.

When a plurality of low-power-consumption receiving channels exist, the voting circuit is an OR gate, and only one low-power-consumption receiving channel outputs a high level, the voting circuit can output the high level as a wake-up signal, and the situation that the wake-up signal cannot be accurately output due to the fact that the frequencies of the interference signal and the broadcasting signal with one frequency are the same or similar is avoided, so that the interference signal can be avoided, the anti-interference capability is improved, and meanwhile, the wake-up success rate is improved.

In some possible implementations, the voting circuit is an and gate.

When a plurality of low-power consumption receiving paths exist, the voting circuit is an AND gate, and the high level can be output as a wake-up signal under the condition that the high level is output by the plurality of low-power consumption receiving paths, so that false wake-up caused by interference signals can be avoided, and the accuracy of outputting the wake-up signal is improved.

In some possible implementations, the number of at least one narrowband filter is a plurality, and the passband frequency of each narrowband filter is different.

The passband frequency of each narrow-band filter is different, so that broadcast signals with different frequencies can be selected, the frequency of the interference signals can be avoided under the condition that the interference signals exist, the broadcast signals are transmitted by adopting the frequency band without interference, and the anti-interference capability is improved.

In some possible implementations, the number of at least one narrowband filter is two or three.

The number of the narrow band filters is too large, and the number of the corresponding low-power consumption receiving paths is also large, which leads to an increase in the number of devices, an increase in the occupied volume, and an increase in cost. The fewer the number of narrowband filters, the fewer the corresponding number of low power receive paths, and thus the fewer frequencies that can be passed, potentially resulting in reduced interference rejection. In the implementation mode, two or three narrow-band filters are adopted, and two or three low-power consumption receiving paths are correspondingly adopted, so that the frequency band of an interference signal can be effectively avoided, the number and the volume of devices of a circuit can be reasonably controlled, and the cost is effectively controlled, and therefore the implementation mode is more reasonable.

In a second aspect, there is provided a receiver comprising a main receive path and a low power wake-up circuit as in any of the first aspects.

In some possible implementations, the receiver further includes: a switch; the switch is respectively connected with the low-power consumption wake-up circuit, the main receiving path and the antenna; and the switch is used for communicating the antenna and the main receiving path when the low-power consumption wake-up circuit outputs a wake-up signal.

The switch is used for gating the main receiving path and the low-power consumption wake-up circuit, so that antenna multiplexing can be realized, the structure of the existing communication system is not required to be changed, the number of antennas is saved, and the cost and the difficulty of antenna design are reduced.

In some possible implementations, the switch is a single pole double throw switch, the common end of which is connected to the antenna.

In a third aspect, a wake-up sequence sending method is provided, applied to a first electronic device, where the first electronic device is configured to send a wake-up sequence to a second electronic device, where the wake-up sequence is used to characterize an identity of the first electronic device, and the second electronic device includes a low-power wake-up circuit, and the low-power wake-up circuit includes at least one narrowband filter; the method comprises the following steps: the method comprises the steps that a first electronic device receives a connection instruction, wherein the connection instruction is used for indicating the first electronic device and a second electronic device to establish network connection; responding to a connection instruction, and respectively sending a wake-up sequence to the second electronic device by the first electronic device according to a plurality of frequencies in a preset frequency set; the plurality of frequencies are frequencies in a first frequency range, the preset frequency set comprises a first frequency and a second frequency, the first frequency and the second frequency differ by a preset bandwidth, the first frequency is any one of the plurality of frequencies, the second frequency is different from the first frequency, and the first frequency range is a drift range of the center frequency of the passband of the at least one narrow-band filter in a preset temperature range.

The first electronic device may be a device for transmitting a broadcast signal, such as a mobile phone, and the second electronic device may be a device, such as a bluetooth headset, in a standby state. When the user needs to connect the mobile phone as the first electronic device with the bluetooth headset as the second electronic device, a connection instruction may be input to the first electronic device, for example, clicking the identifier of the bluetooth headset in the first electronic device. The mobile phone receives a connection instruction triggered by clicking operation of a user, and can repeatedly transmit broadcast signals carrying wake-up sequences according to adjustable frequency points capable of covering the temperature drift range of the narrow-band filter. For example, the plurality of frequencies are frequencies in a preset frequency set, and the plurality of frequencies in the preset frequency set can cover a first frequency range, wherein the first frequency range is a drift range of a center frequency of a passband of the narrowband filter within a preset temperature range, that is, a temperature drift range of the passband of the narrowband filter. Any two adjacent frequencies in the preset frequency set are different by a preset bandwidth.

Optionally, when the low power consumption wake-up circuit includes a narrowband filter, the first frequency range may be a drift range of a center frequency of a passband of the narrowband filter within a preset temperature range; when the low power consumption wake-up circuit includes a plurality of narrowband filters, the first frequency range may be a sum of ranges of drift ranges of frequencies of pass bands of the plurality of narrowband filters within a preset temperature range.

In this implementation manner, even if the narrowband filter in the low-power-consumption wake-up circuit in the second electronic device generates a temperature drift, the transmitting end always transmits a broadcast signal falling within the passband of the narrowband filter after the round transmission, so as to output the wake-up signal. The method can avoid the situation that the receiver cannot be accurately awakened due to the fact that the broadcasting signal cannot be used due to the ground temperature drift of the narrow-band filter, improves the temperature range suitable for the low-power-consumption awakening circuit, and is wider in use scene.

In some possible implementations, the preset bandwidth has a value in the range of 50KHz-1000KHz.

In some possible implementations, the preset bandwidth is 120KHz and the number of the plurality of frequencies in the preset frequency set is 45.

For 2.4G WIFI signals, transmission of narrowband signals can be achieved through preset bandwidths spaced at intervals of 120KHz, and interference of most interference signals can be avoided. Meanwhile, the number of the frequencies in the preset frequency set is 45, namely, broadcast signals with the frequency interval of 120KHz are transmitted for 45 times, so that frequency offset in the temperature range of-20 degrees to 60 degrees can be covered, the coverage temperature range is comprehensive, the situation that a receiver cannot be awakened in time due to incomplete coverage temperature range is avoided, and the application scene is wider.

In a fourth aspect, an electronic device is provided, which includes any one of the low power wake-up circuits according to the first aspect.

In a fifth aspect, there is provided an electronic device comprising a receiver according to any of the solutions described in the second aspect.

In a sixth aspect, there is provided an apparatus for transmitting an arbitrary wake-up sequence, comprising a unit comprising software and/or hardware, the unit being configured to perform any one of the methods according to the third aspect.

In a seventh aspect, there is provided an electronic device comprising: a processor, a memory, and an interface;

the processor, the memory and the interface cooperate with each other such that the electronic device performs any one of the methods according to the third aspect.

In an eighth aspect, a chip is provided, comprising a processor; the processor is configured to read and execute a computer program stored in the memory to perform any one of the methods according to the third aspect.

Optionally, the chip further comprises a memory, and the memory is connected with the processor through a circuit or a wire.

Further optionally, the chip further comprises a communication interface.

In a ninth aspect, there is provided a computer readable storage medium having stored therein a computer program which, when executed by a processor, causes the processor to perform any one of the methods according to the third aspect.

In a tenth aspect, there is provided a computer program product comprising: computer program code which, when run on an electronic device, causes the electronic device to carry out any one of the methods of the third aspect.

Drawings

Fig. 1 is a schematic structural diagram of an example of a terminal device 100 according to an embodiment of the present application;

fig. 2 is a software architecture block diagram of a terminal device 100 provided in an embodiment of the present application;

Fig. 3 is a schematic diagram of an application scenario of a typical wake-up device according to an embodiment of the present application;

Fig. 4 is a schematic structural diagram of a conventional receiver according to an embodiment of the present application;

Fig. 5 is a timing diagram of a low duty cycle scheme according to an embodiment of the present application;

FIG. 6 is an application scenario diagram of an exemplary conventional wake-up circuit with low power consumption according to an embodiment of the present application;

FIG. 7 is a graph comparing power consumption curves of an example of different receiver schemes provided by an embodiment of the present application;

FIG. 8 is an application scenario diagram of an example low power wake-up circuit provided by an embodiment of the present application;

FIG. 9 is an interaction diagram for generating a wake-up signal according to an embodiment of the present application;

FIG. 10 is a schematic diagram of a low power wake-up circuit according to an embodiment of the present application;

FIG. 11 is a schematic diagram of a structure and a frequency response curve of an exemplary narrow band filter according to an embodiment of the present application;

FIG. 12 is a schematic diagram of a low power wake-up circuit according to an embodiment of the present application;

FIG. 13 is a schematic diagram of a low power wake-up circuit according to an embodiment of the present application;

FIG. 14 is a schematic diagram of a low power wake-up circuit according to an embodiment of the present application;

fig. 15 is a circuit diagram showing the circuit configuration shown in fig. 14 divided by basic functions;

Fig. 16 is a schematic circuit diagram of an example of a low power wake-up circuit applied in a receiver according to an embodiment of the present application;

FIG. 17 is a flowchart illustrating an example wake-up sequence sending method according to an embodiment of the present application;

Fig. 18 is a schematic diagram of an example wake-up sequence sending device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. Wherein, in the description of the embodiments of the present application, unless otherwise indicated, "/" means or, for example, a/B may represent a or B; "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, in the description of the embodiments of the present application, "plurality" means two or more than two.

The terms "first," "second," "third," and the like, are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", or a third "may explicitly or implicitly include one or more such feature.

The low-power consumption wake-up circuit and the receiver provided by the embodiment of the application can be applied to wearable devices such as Bluetooth headphones, smart watches, smart bracelets, smart glasses and the like, and also can be applied to terminal devices such as mobile phones, tablet computers, wearable devices, vehicle-mounted devices, augmented reality (augmented reality, AR)/Virtual Reality (VR) devices, notebook computers, ultra-mobile personal computer (UMPC), netbooks, personal digital assistants (personal DIGITAL ASSISTANT, PDA) and the like, and the embodiment of the application does not limit the specific types of the terminal devices.

Fig. 1 is a schematic structural diagram of an exemplary terminal device 100 according to an embodiment of the present application. The terminal device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (universal serial bus, USB) interface 130, a charge management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, keys 190, a motor 191, an indicator 192, a camera 193, a display 194, and a subscriber identity module (subscriber identification module, SIM) card interface 195, etc. The sensor module 180 may include a pressure sensor 180A, a gyro sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, a bone conduction sensor 180M, and the like.

It is to be understood that the structure illustrated in the embodiment of the present application does not constitute a specific limitation on the terminal device 100. In other embodiments of the application, terminal device 100 may include more or less components than illustrated, or certain components may be combined, or certain components may be split, or different arrangements of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

The processor 110 may include one or more processing units, such as: the processor 110 may include an application processor (application processor, AP), a modem processor, a graphics processor (graphics processing unit, GPU), an image signal processor (IMAGE SIGNAL processor, ISP), a controller, a memory, a video codec, a digital signal processor (DIGITAL SIGNAL processor, DSP), a baseband processor, and/or a neural Network Processor (NPU), etc. Wherein the different processing units may be separate devices or may be integrated in one or more processors.

The controller may be a neural center and a command center of the terminal device 100. The controller can generate operation control signals according to the instruction operation codes and the time sequence signals to finish the control of instruction fetching and instruction execution.

A memory may also be provided in the processor 110 for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory may hold instructions or data that the processor 110 has just used or recycled. If the processor 110 needs to reuse the instruction or data, it can be called directly from the memory. Repeated accesses are avoided and the latency of the processor 110 is reduced, thereby improving the efficiency of the system.

In some embodiments, the processor 110 may include one or more interfaces. The interfaces may include an integrated circuit (inter-INTEGRATED CIRCUIT, I2C) interface, an integrated circuit built-in audio (inter-INTEGRATED CIRCUIT SOUND, I2S) interface, a pulse code modulation (pulse code modulation, PCM) interface, a universal asynchronous receiver transmitter (universal asynchronous receiver/transmitter, UART) interface, a mobile industry processor interface (mobile industry processor interface, MIPI), a general-purpose input/output (GPIO) interface, a subscriber identity module (subscriber identity module, SIM) interface, and/or a universal serial bus (universal serial bus, USB) interface, among others.

The I2C interface is a bi-directional synchronous serial bus comprising a serial data line (SERIAL DATA LINE, SDA) and a serial clock line (derail clock line, SCL). In some embodiments, the processor 110 may contain multiple sets of I2C buses. The processor 110 may be coupled to the touch sensor 180K, charger, flash, camera 193, etc., respectively, through different I2C bus interfaces. For example: the processor 110 may be coupled to the touch sensor 180K through an I2C interface, so that the processor 110 and the touch sensor 180K communicate through an I2C bus interface to implement a touch function of the terminal device 100.

The I2S interface may be used for audio communication. In some embodiments, the processor 110 may contain multiple sets of I2S buses. The processor 110 may be coupled to the audio module 170 via an I2S bus to enable communication between the processor 110 and the audio module 170. In some embodiments, the audio module 170 may transmit an audio signal to the wireless communication module 160 through the I2S interface, to implement a function of answering a call through the bluetooth headset.

PCM interfaces may also be used for audio communication to sample, quantize and encode analog signals. In some embodiments, the audio module 170 and the wireless communication module 160 may be coupled through a PCM bus interface. In some embodiments, the audio module 170 may also transmit audio signals to the wireless communication module 160 through the PCM interface to implement a function of answering a call through the bluetooth headset. Both the I2S interface and the PCM interface may be used for audio communication.

The UART interface is a universal serial data bus for asynchronous communications. The bus may be a bi-directional communication bus. It converts the data to be transmitted between serial communication and parallel communication. In some embodiments, a UART interface is typically used to connect the processor 110 with the wireless communication module 160. For example: the processor 110 communicates with a bluetooth module in the wireless communication module 160 through a UART interface to implement a bluetooth function. In some embodiments, the audio module 170 may transmit an audio signal to the wireless communication module 160 through a UART interface, to implement a function of playing music through a bluetooth headset.

The MIPI interface may be used to connect the processor 110 to peripheral devices such as a display 194, a camera 193, and the like. The MIPI interfaces include camera serial interfaces (CAMERA SERIAL INTERFACE, CSI), display serial interfaces (DISPLAY SERIAL INTERFACE, DSI), and the like. In some embodiments, processor 110 and camera 193 communicate through a CSI interface to implement the photographing function of terminal device 100. The processor 110 and the display 194 communicate via a DSI interface to implement the display function of the terminal device 100.

The GPIO interface may be configured by software. The GPIO interface may be configured as a control signal or as a data signal. In some embodiments, a GPIO interface may be used to connect the processor 110 with the camera 193, the display 194, the wireless communication module 160, the audio module 170, the sensor module 180, and the like. The GPIO interface may also be configured as an I2C interface, an I2S interface, a UART interface, an MIPI interface, etc.

The USB interface 130 is an interface conforming to the USB standard specification, and may specifically be a Mini USB interface, a Micro USB interface, a USB Type C interface, or the like. The USB interface 130 may be used to connect a charger to charge the terminal device 100, or may be used to transfer data between the terminal device 100 and a peripheral device. And can also be used for connecting with a headset, and playing audio through the headset. The interface may also be used to connect other terminal devices, such as AR devices, etc.

It should be understood that the interfacing relationship between the modules illustrated in the embodiment of the present application is only illustrative, and does not constitute a structural limitation of the terminal device 100. In other embodiments of the present application, the terminal device 100 may also use different interfacing manners, or a combination of multiple interfacing manners in the foregoing embodiments.

The charge management module 140 is configured to receive a charge input from a charger. The charger can be a wireless charger or a wired charger. In some wired charging embodiments, the charge management module 140 may receive a charging input of a wired charger through the USB interface 130. In some wireless charging embodiments, the charge management module 140 may receive wireless charging input through a wireless charging coil of the terminal device 100. The charging management module 140 may also supply power to the terminal device through the power management module 141 while charging the battery 142.

The power management module 141 is used for connecting the battery 142, and the charge management module 140 and the processor 110. The power management module 141 receives input from the battery 142 and/or the charge management module 140 and provides power to the processor 110, the internal memory 121, the external memory, the display 194, the camera 193, the wireless communication module 160, and the like. The power management module 141 may also be configured to monitor battery capacity, battery cycle number, battery health (leakage, impedance) and other parameters. In other embodiments, the power management module 141 may also be provided in the processor 110. In other embodiments, the power management module 141 and the charge management module 140 may be disposed in the same device.

The wireless communication function of the terminal device 100 can be implemented by the antenna 1, the antenna 2, the mobile communication module 150, the wireless communication module 160, a modem processor, a baseband processor, and the like.

The antennas 1 and 2 are used for transmitting and receiving electromagnetic wave signals. The structures of the antennas 1 and 2 in fig. 1 are only one example. Each antenna in the terminal device 100 may be used to cover a single or multiple communication bands. Different antennas may also be multiplexed to improve the utilization of the antennas. For example: the antenna 1 may be multiplexed into a diversity antenna of a wireless local area network. In other embodiments, the antenna may be used in conjunction with a tuning switch.

The mobile communication module 150 may provide a solution including 2G/3G/4G/5G wireless communication applied to the terminal device 100. The mobile communication module 150 may include at least one filter, switch, power amplifier, low noise amplifier (low noise amplifier, LNA), etc. The mobile communication module 150 may receive electromagnetic waves from the antenna 1, perform processes such as filtering, amplifying, and the like on the received electromagnetic waves, and transmit the processed electromagnetic waves to the modem processor for demodulation. The mobile communication module 150 can amplify the signal modulated by the modem processor, and convert the signal into electromagnetic waves through the antenna 1 to radiate. In some embodiments, at least some of the functional modules of the mobile communication module 150 may be disposed in the processor 110. In some embodiments, at least some of the functional modules of the mobile communication module 150 may be provided in the same device as at least some of the modules of the processor 110.

The modem processor may include a modulator and a demodulator. The modulator is used for modulating the low-frequency baseband signal to be transmitted into a medium-high frequency signal. The demodulator is used for demodulating the received electromagnetic wave signal into a low-frequency baseband signal. The demodulator then transmits the demodulated low frequency baseband signal to the baseband processor for processing. The low frequency baseband signal is processed by the baseband processor and then transferred to the application processor. The application processor outputs sound signals through an audio device (not limited to the speaker 170A, the receiver 170B, etc.), or displays images or video through the display screen 194. In some embodiments, the modem processor may be a stand-alone device. In other embodiments, the modem processor may be provided in the same device as the mobile communication module 150 or other functional module, independent of the processor 110.

The wireless communication module 160 may provide solutions for wireless communication including wireless local area network (wireless local area networks, WLAN) (e.g., wireless fidelity (WIRELESS FIDELITY, wi-Fi) network), bluetooth (BT), global navigation satellite system (global navigation SATELLITE SYSTEM, GNSS), frequency modulation (frequency modulation, FM), near field communication (NEAR FIELD communication, NFC), infrared (IR), etc., applied on the terminal device 100. The wireless communication module 160 may be one or more devices that integrate at least one communication processing module. The wireless communication module 160 receives electromagnetic waves via the antenna 2, modulates the electromagnetic wave signals, filters the electromagnetic wave signals, and transmits the processed signals to the processor 110. The wireless communication module 160 may also receive a signal to be transmitted from the processor 110, frequency modulate it, amplify it, and convert it to electromagnetic waves for radiation via the antenna 2.

In some embodiments, antenna 1 and mobile communication module 150 of terminal device 100 are coupled, and antenna 2 and wireless communication module 160 are coupled, such that terminal device 100 may communicate with a network and other devices via wireless communication techniques. The wireless communication techniques can include the Global System for Mobile communications (global system for mobile communications, GSM), general packet radio service (GENERAL PACKET radio service, GPRS), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (wideband code division multiple access, WCDMA), time division code division multiple access (time-division code division multiple access, TD-SCDMA), long term evolution (long term evolution, LTE), BT, GNSS, WLAN, NFC, FM, and/or IR techniques, among others. The GNSS may include a global satellite positioning system (global positioning system, GPS), a global navigation satellite system (global navigation SATELLITE SYSTEM, GLONASS), a beidou satellite navigation system (beidou navigation SATELLITE SYSTEM, BDS), a quasi zenith satellite system (quasi-zenith SATELLITE SYSTEM, QZSS) and/or a satellite based augmentation system (SATELLITE BASED AUGMENTATION SYSTEMS, SBAS).

The terminal device 100 implements display functions through a GPU, a display screen 194, an application processor, and the like. The GPU is a microprocessor for image processing, and is connected to the display 194 and the application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. Processor 110 may include one or more GPUs that execute program instructions to generate or change display information.

The display screen 194 is used to display images, videos, and the like. The display 194 includes a display panel. The display panel may employ a Liquid Crystal Display (LCD) CRYSTAL DISPLAY, an organic light-emitting diode (OLED), an active-matrix organic LIGHT EMITTING diode (AMOLED), a flexible light-emitting diode (FLED), miniled, microLed, micro-oLed, a quantum dot LIGHT EMITTING diode (QLED), or the like. In some embodiments, the terminal device 100 may include 1 or N display screens 194, N being a positive integer greater than 1.

The terminal device 100 may implement a photographing function through an ISP, a camera 193, a video codec, a GPU, a display screen 194, an application processor, and the like.

The ISP is used to process data fed back by the camera 193. For example, when photographing, the shutter is opened, light is transmitted to the camera photosensitive element through the lens, the optical signal is converted into an electric signal, and the camera photosensitive element transmits the electric signal to the ISP for processing and is converted into an image visible to naked eyes. ISP can also optimize the noise, brightness and skin color of the image. The ISP can also optimize parameters such as exposure, color temperature and the like of a shooting scene. In some embodiments, the ISP may be provided in the camera 193.

The camera 193 is used to capture still images or video. The object generates an optical image through the lens and projects the optical image onto the photosensitive element. The photosensitive element may be a charge coupled device (charge coupled device, CCD) or a Complementary Metal Oxide Semiconductor (CMOS) phototransistor. The photosensitive element converts the optical signal into an electrical signal, which is then transferred to the ISP to be converted into a digital image signal. The ISP outputs the digital image signal to the DSP for processing. The DSP converts the digital image signal into an image signal in a standard RGB, YUV, or the like format. In some embodiments, the terminal device 100 may include 1 or N cameras 193, N being a positive integer greater than 1.

The digital signal processor is used for processing digital signals, and can process other digital signals besides digital image signals. For example, when the terminal device 100 selects a frequency bin, the digital signal processor is used to fourier transform the frequency bin energy, or the like.

Video codecs are used to compress or decompress digital video. The terminal device 100 may support one or more video codecs. In this way, the terminal device 100 can play or record video in various encoding formats, for example: dynamic picture experts group (moving picture experts group, MPEG) 1, MPEG2, MPEG3, MPEG4, etc.

The NPU is a neural-network (NN) computing processor, and can rapidly process input information by referencing a biological neural network structure, for example, referencing a transmission mode between human brain neurons, and can also continuously perform self-learning. Applications such as intelligent awareness of the terminal device 100 may be implemented by the NPU, for example: image recognition, face recognition, speech recognition, text understanding, etc.

The external memory interface 120 may be used to connect an external memory card, such as a Micro SD card, to realize expansion of the memory capability of the terminal device 100. The external memory card communicates with the processor 110 through an external memory interface 120 to implement data storage functions. For example, files such as music, video, etc. are stored in an external memory card.

The internal memory 121 may be used to store computer executable program code including instructions. The processor 110 executes various functional applications of the terminal device 100 and data processing by executing instructions stored in the internal memory 121. The internal memory 121 may include a storage program area and a storage data area. The storage program area may store an application program (such as a sound playing function, an image playing function, etc.) required for at least one function of the operating system, etc. The storage data area may store data (such as audio data, phonebook, etc.) created during use of the terminal device 100, and the like. In addition, the internal memory 121 may include a high-speed random access memory, and may further include a nonvolatile memory such as at least one magnetic disk storage device, a flash memory device, a universal flash memory (universal flash storage, UFS), and the like.

The terminal device 100 may implement audio functions through an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, an application processor, and the like. Such as music playing, recording, etc.

The audio module 170 is used to convert digital audio information into an analog audio signal output and also to convert an analog audio input into a digital audio signal. The audio module 170 may also be used to encode and decode audio signals. In some embodiments, the audio module 170 may be disposed in the processor 110, or a portion of the functional modules of the audio module 170 may be disposed in the processor 110.

The speaker 170A, also referred to as a "horn," is used to convert audio electrical signals into sound signals. The terminal device 100 can listen to music or to handsfree talk through the speaker 170A.

A receiver 170B, also referred to as a "earpiece", is used to convert the audio electrical signal into a sound signal. When the terminal device 100 receives a call or voice message, it is possible to receive voice by approaching the receiver 170B to the human ear.

Microphone 170C, also referred to as a "microphone" or "microphone", is used to convert sound signals into electrical signals. When making a call or transmitting voice information, the user can sound near the microphone 170C through the mouth, inputting a sound signal to the microphone 170C. The terminal device 100 may be provided with at least one microphone 170C. In other embodiments, the terminal device 100 may be provided with two microphones 170C, and may implement a noise reduction function in addition to collecting sound signals. In other embodiments, the terminal device 100 may be further provided with three, four or more microphones 170C to collect sound signals, reduce noise, identify the source of sound, implement directional recording functions, etc.

The earphone interface 170D is used to connect a wired earphone. The earphone interface 170D may be a USB interface 130 or a 3.5mm open mobile terminal platform (open mobile terminal platform, OMTP) standard interface, a american cellular telecommunications industry association (cellular telecommunications industry association of the USA, CTIA) standard interface.

The pressure sensor 180A is used to sense a pressure signal, and may convert the pressure signal into an electrical signal. In some embodiments, the pressure sensor 180A may be disposed on the display screen 194. The pressure sensor 180A is of various types, such as a resistive pressure sensor, an inductive pressure sensor, a capacitive pressure sensor, and the like. The capacitive pressure sensor may be a capacitive pressure sensor comprising at least two parallel plates with conductive material. The capacitance between the electrodes changes when a force is applied to the pressure sensor 180A. The terminal device 100 determines the intensity of the pressure according to the change of the capacitance. When a touch operation is applied to the display 194, the terminal device 100 detects the intensity of the touch operation according to the pressure sensor 180A. The terminal device 100 may also calculate the position of the touch from the detection signal of the pressure sensor 180A. In some embodiments, touch operations that act on the same touch location, but at different touch operation strengths, may correspond to different operation instructions. For example: and executing an instruction for checking the short message when the touch operation with the touch operation intensity smaller than the first pressure threshold acts on the short message application icon. And executing an instruction for newly creating the short message when the touch operation with the touch operation intensity being greater than or equal to the first pressure threshold acts on the short message application icon.

The gyro sensor 180B may be used to determine a motion gesture of the terminal device 100. In some embodiments, the angular velocity of the terminal device 100 about three axes (i.e., x, y, and z axes) may be determined by the gyro sensor 180B. The gyro sensor 180B may be used for photographing anti-shake. Illustratively, when the shutter is pressed, the gyro sensor 180B detects the angle of the shake of the terminal device 100, calculates the distance to be compensated by the lens module according to the angle, and allows the lens to counteract the shake of the terminal device 100 by the reverse motion, thereby realizing anti-shake. The gyro sensor 180B may also be used for navigating, somatosensory game scenes.

The air pressure sensor 180C is used to measure air pressure. In some embodiments, the terminal device 100 calculates altitude from barometric pressure values measured by the barometric pressure sensor 180C, aiding in positioning and navigation.

The magnetic sensor 180D includes a hall sensor. The terminal device 100 can detect the opening and closing of the flip cover using the magnetic sensor 180D. In some embodiments, when the terminal device 100 is a folder, the terminal device 100 may detect opening and closing of the folder according to the magnetic sensor 180D. And then according to the detected opening and closing state of the leather sheath or the opening and closing state of the flip, the characteristics of automatic unlocking of the flip and the like are set.

The acceleration sensor 180E can detect the magnitude of acceleration of the terminal device 100 in various directions (typically three axes). The magnitude and direction of gravity may be detected when the terminal device 100 is stationary. The method can also be used for identifying the gesture of the terminal equipment, and is applied to the applications such as horizontal and vertical screen switching, pedometers and the like.

A distance sensor 180F for measuring a distance. The terminal device 100 may measure the distance by infrared or laser. In some embodiments, the terminal device 100 may range using the distance sensor 180F to achieve fast focusing.

The proximity light sensor 180G may include, for example, a Light Emitting Diode (LED) and a light detector, such as a photodiode. The light emitting diode may be an infrared light emitting diode. The terminal device 100 emits infrared light outward through the light emitting diode. The terminal device 100 detects infrared reflected light from a nearby object using a photodiode. When sufficient reflected light is detected, it can be determined that there is an object in the vicinity of the terminal device 100. When insufficient reflected light is detected, the terminal device 100 may determine that there is no object in the vicinity of the terminal device 100. The terminal device 100 can detect that the user holds the terminal device 100 close to the ear to talk by using the proximity light sensor 180G, so as to automatically extinguish the screen for the purpose of saving power. The proximity light sensor 180G may also be used in holster mode, pocket mode to automatically unlock and lock the screen.

The ambient light sensor 180L is used to sense ambient light level. The terminal device 100 may adaptively adjust the brightness of the display 194 based on the perceived ambient light level. The ambient light sensor 180L may also be used to automatically adjust white balance when taking a photograph. The ambient light sensor 180L may also cooperate with the proximity light sensor 180G to detect whether the terminal device 100 is in a pocket to prevent false touches.

The fingerprint sensor 180H is used to collect a fingerprint. The terminal device 100 can utilize the collected fingerprint characteristics to realize fingerprint unlocking, access an application lock, fingerprint photographing, fingerprint incoming call answering and the like.

The temperature sensor 180J is for detecting temperature. In some embodiments, the terminal device 100 performs a temperature processing strategy using the temperature detected by the temperature sensor 180J. For example, when the temperature reported by the temperature sensor 180J exceeds a threshold, the terminal device 100 performs a reduction in the performance of a processor located near the temperature sensor 180J in order to reduce power consumption to implement thermal protection. In other embodiments, when the temperature is below another threshold, the terminal device 100 heats the battery 142 to avoid the low temperature causing the terminal device 100 to shut down abnormally. In other embodiments, when the temperature is below a further threshold, the terminal device 100 performs boosting of the output voltage of the battery 142 to avoid abnormal shutdown caused by low temperatures.

The touch sensor 180K, also referred to as a "touch panel". The touch sensor 180K may be disposed on the display screen 194, and the touch sensor 180K and the display screen 194 form a touch screen, which is also called a "touch screen". The touch sensor 180K is for detecting a touch operation acting thereon or thereabout. The touch sensor may communicate the detected touch operation to the application processor to determine the touch event type. Visual output related to touch operations may be provided through the display 194. In other embodiments, the touch sensor 180K may also be disposed on the surface of the terminal device 100 at a different location than the display 194.

The bone conduction sensor 180M may acquire a vibration signal. In some embodiments, bone conduction sensor 180M may acquire a vibration signal of a human vocal tract vibrating bone pieces. The bone conduction sensor 180M may also contact the pulse of the human body to receive the blood pressure pulsation signal. In some embodiments, bone conduction sensor 180M may also be provided in a headset, in combination with an osteoinductive headset. The audio module 170 may analyze the voice signal based on the vibration signal of the sound portion vibration bone block obtained by the bone conduction sensor 180M, so as to implement a voice function. The application processor may analyze the heart rate information based on the blood pressure beat signal acquired by the bone conduction sensor 180M, so as to implement a heart rate detection function.

The keys 190 include a power-on key, a volume key, etc. The keys 190 may be mechanical keys. Or may be a touch key. The terminal device 100 may receive key inputs, generating key signal inputs related to user settings and function controls of the terminal device 100.

The motor 191 may generate a vibration cue. The motor 191 may be used for incoming call vibration alerting as well as for touch vibration feedback. For example, touch operations acting on different applications (e.g., photographing, audio playing, etc.) may correspond to different vibration feedback effects. The motor 191 may also correspond to different vibration feedback effects by touching different areas of the display screen 194. Different application scenarios (such as time reminding, receiving information, alarm clock, game, etc.) can also correspond to different vibration feedback effects. The touch vibration feedback effect may also support customization.

The indicator 192 may be an indicator light, may be used to indicate a state of charge, a change in charge, a message indicating a missed call, a notification, etc.

The SIM card interface 195 is used to connect a SIM card. The SIM card may be contacted and separated from the terminal apparatus 100 by being inserted into the SIM card interface 195 or by being withdrawn from the SIM card interface 195. The terminal device 100 may support 1 or N SIM card interfaces, N being a positive integer greater than 1. The SIM card interface 195 may support Nano SIM cards, micro SIM cards, and the like. The same SIM card interface 195 may be used to insert multiple cards simultaneously. The types of the plurality of cards may be the same or different. The SIM card interface 195 may also be compatible with different types of SIM cards. The SIM card interface 195 may also be compatible with external memory cards. The terminal device 100 interacts with the network through the SIM card to realize functions such as call and data communication. In some embodiments, the terminal device 100 employs esims, namely: an embedded SIM card. The eSIM card can be embedded in the terminal device 100 and cannot be separated from the terminal device 100.

The software system of the terminal device 100 may employ a layered architecture, an event driven architecture, a micro-core architecture, a micro-service architecture, or a cloud architecture. In the embodiment of the application, taking an Android system with a layered architecture as an example, a software structure of the terminal device 100 is illustrated.

Fig. 2 is a software configuration block diagram of the terminal device 100 of the embodiment of the present application. The layered architecture divides the software into several layers, each with distinct roles and branches. The layers communicate with each other through a software interface. In some embodiments, the Android system is divided into four layers, from top to bottom, an application layer, an application framework layer, an Zhuoyun rows (Android runtime) and system libraries, and a kernel layer, respectively. The application layer may include a series of application packages.

As shown in fig. 2, the application package may include applications for cameras, gallery, calendar, phone calls, maps, navigation, WLAN, bluetooth, music, video, short messages, etc.

The application framework layer provides an application programming interface (application programming interface, API) and programming framework for the application of the application layer. The application framework layer includes a number of predefined functions.

As shown in FIG. 2, the application framework layer may include a window manager, a content provider, a view system, a telephony manager, a resource manager, a notification manager, and the like.

The window manager is used for managing window programs. The window manager can acquire the size of the display screen, judge whether a status bar exists, lock the screen, intercept the screen and the like.

The content provider is used to store and retrieve data and make such data accessible to applications. The data may include video, images, audio, calls made and received, browsing history and bookmarks, phonebooks, etc.

The view system includes visual controls, such as controls to display text, controls to display pictures, and the like. The view system may be used to build applications. The display interface may be composed of one or more views. For example, a display interface including a text message notification icon may include a view displaying text and a view displaying a picture.

The telephony manager is used to provide the communication functions of the terminal device 100. Such as the management of call status (including on, hung-up, etc.).

The resource manager provides various resources for the application program, such as localization strings, icons, pictures, layout files, video files, and the like.

The notification manager allows the application to display notification information in a status bar, can be used to communicate notification type messages, can automatically disappear after a short dwell, and does not require user interaction. Such as notification manager is used to inform that the download is complete, message alerts, etc. The notification manager may also be a notification in the form of a chart or scroll bar text that appears on the system top status bar, such as a notification of a background running application, or a notification that appears on the screen in the form of a dialog window. For example, a text message is prompted in a status bar, a prompt tone is emitted, the terminal equipment vibrates, and an indicator light blinks.

Android runtime include core libraries and virtual machines. Android runtime is responsible for scheduling and management of the android system.

The core library consists of two parts: one part is a function which needs to be called by java language, and the other part is a core library of android.

The application layer and the application framework layer run in a virtual machine. The virtual machine executes java files of the application program layer and the application program framework layer as binary files. The virtual machine is used for executing the functions of object life cycle management, stack management, thread management, security and exception management, garbage collection and the like.

The system library may include a plurality of functional modules. For example: surface manager (surface manager), media library (media library), three-dimensional graphics processing library (e.g., openGL ES), 2D graphics engine (e.g., SGL), etc.

The surface manager is used to manage the display subsystem and provides a fusion of 2D and 3D layers for multiple applications.

Media libraries support a variety of commonly used audio, video format playback and recording, still image files, and the like. The media library may support a variety of audio and video encoding formats, such as MPEG4, h.264, MP3, AAC, AMR, JPG, PNG, etc.

The three-dimensional graphic processing library is used for realizing three-dimensional graphic drawing, image rendering, synthesis, layer processing and the like.

The 2D graphics engine is a drawing engine for 2D drawing.

The kernel layer is a layer between hardware and software. The inner core layer at least comprises a display driver, a camera driver, an audio driver and a sensor driver.

With the development of terminal technology, wearable devices such as bluetooth headsets and smart watches are increasingly used in the production and life of people. Wearable devices often need to establish a network connection with a terminal device such as a cell phone for use. Taking the wearable device as a bluetooth headset as an example, the usage scenario shown in fig. 3 can be seen. In fig. 3, a bluetooth headset 301 transmits data and plays audio files of a mobile phone by establishing a bluetooth connection with the mobile phone 302. In general, the bluetooth headset 301 may be in a standby state when not in use. In the standby state, the bluetooth headset 301 may still monitor the broadcast signal of the mobile phone 302. When the bluetooth headset 301 monitors the broadcast signal sent by the paired mobile phone 302, it can switch to the working state, and establish bluetooth connection with the mobile phone 302 for use.

Typically, the battery capacity of the wearable device is small. If the standby power consumption is large, the standby time length is shortened, and the user experience is affected. In the conventional scheme, when the wearable device is in a standby state, a main chip (for example, a bluetooth chip or a WIFI chip) of a communication module in the wearable device is always in a transmitting and receiving state; in addition, the receiver itself consumes a certain amount of power in the standby state, so that the standby power consumption is relatively large.

The circuit structure of the conventional receiver may be seen in fig. 4, including: a low noise amplifier 401, a mixer 402, a voltage controlled oscillator 403, an amplifier 404, a band pass filter 405 and an analog to digital converter 406. The antenna receives a received signal and amplifies it by the low noise amplifier 401; then, the mixed signals enter a mixer 402 and a local oscillation signal output by a voltage-controlled oscillator 403 to be mixed so as to obtain intermediate frequency signals; then the intermediate frequency signal sequentially enters an amplifier 404 and a filter 405 for amplification and filtering; finally, the signal enters an analog-to-digital converter 406, and the intermediate frequency signal is converted from an analog signal to a digital signal and enters a baseband (BB) processor for subsequent processing. The amplifier 404 may be a Variable Gain Amplifier (VGA) such as a variable GAIN AMPLIFIER. In the standby state, the amplifier 404 and the voltage controlled oscillator 403 are turned on, and consume a certain amount of power. Typically, the power consumption of both the amplifier 404 and the voltage controlled oscillator 403 is in milliwatts, so that the standby power consumption is also in milliwatts.

The standby power consumption described in the present application generally refers to power consumption in the reception state.

In order to reduce standby power consumption and prolong standby time, a scheme of low duty ratio of receiving and transmitting signals can be adopted to reduce working time of a main chip. For example, as shown in fig. 5, some wearable devices may receive a transmission signal with a duration of 60 milliseconds (ms) at intervals of 600 ms when in a standby state, that is, the duty cycle is 10%, so that the duration of receiving the signal by the wearable device is reduced, and the standby power consumption is effectively reduced. In the case of the transmitting end, a signal with a duration of 3ms can be transmitted every 20ms, i.e. the duty cycle is 15%. The transmitting end also reduces the duration of transmitting signals, and can reduce the power consumption in the transmitting state. Table 1 shows the standby current (including the emission current and the reception current) in the standby state of three different chips actually measured:

TABLE 1

Operating state	Bluetooth chip 1	Bluetooth chip 2	Bluetooth chip 3
				Receiving a current	4.6mA	6mA	5.4mA
Emission current (0 dBm)	4.6mA	6mA	5.3mA

The transmit signals in table 1 are illustrated with transmit currents at a transmit power of 0 decibel milliwatts (dBm). As can be seen from table 1, the standby current is in the order of milliamps, both in the transmit and receive states. The standby power consumption is in milliwatts, calculated from the supply voltage of the chip being 3.3 volts (V). In the scheme with low duty ratio, the larger the duty ratio of the receiving and transmitting signals is, the larger the standby power consumption is; the smaller the duty cycle of the receiving and transmitting signals, the larger the delay is caused, and the user experience is affected.

A scheme for waking up a receiver (low power wake up receiver, LP-WUR) with low power consumption is proposed in IEEE protocol 802.11ba, where 4MHz is divided from the 20HMz operating bandwidth of 2.4G-WIFI as the transmission bandwidth of the wake-up sequence. In fig. 6, taking the example that the router 601 and the terminal device 602 establish WIFI communication, the router 601 may broadcast a broadcast signal carrying a wake-up sequence in the divided bandwidth range of 4 MHz. The WIFI module of the terminal equipment is provided with a low-power consumption wake-up circuit. The low-power consumption wake-up circuit is connected with the antenna and used for monitoring the broadcast signals. When the low-power consumption wake-up circuit receives the broadcast signal from the router 601 through the antenna, the wake-up signal can be sent to the main chip of the WIFI module to wake-up the WIFI module to restore to the working state, and the low-power consumption wake-up circuit establishes WIFI communication connection with the router 601. If the router 601 does not broadcast a broadcast signal carrying a wake-up sequence, the low power consumption wake-up circuit does not need to output the wake-up signal, and at this time, the main chip of the WIFI module and the original transceiver path can all keep in a sleep state (or a closed state) all the time, so as to save power consumption. If the scheme of waking up the receiver with low power consumption is combined with the duty cycle mode, the standby power consumption can be further reduced, and in particular, the standby power consumption graph shown in fig. 7 can be referred to. In fig. 7, the standby power consumption is about 1.6mW in the conventional power saving mode-polling (PS-poll) mode scheme, and in the conventional receiver combined with low duty cycle scheme; by adopting the scheme of waking up the receiver with low power consumption in IEEE protocol 802.11ba, when the low power consumption wake-up circuit is normally open, the standby power consumption is about 105 microwatts (mu W); if the low power consumption wake-up circuit combines the scheme of the duty cycle, when the wake-up circuit wakes up every 100ms for 2ms (namely, the duty cycle is 2%), the standby power consumption is about 7 mu W, and the standby power consumption is obviously reduced.

But the above-described receiver scheme suffers from poor interference immunity. Taking the conventional receiver shown in fig. 4 as an example, if the interference signal is white noise, since the power spectral density of the white noise does not vary with the frequency variation, and the white noise is random noise, for example, the power spectral density of the white noise is-174 dBm/Hz at normal temperature. White noise is different from a useful signal (e.g., a received signal) in that the energy of the useful signal is concentrated and distributed at a certain frequency. More energy can be accumulated by the useful signal in a certain time, and the power spectrum density of the random white noise is always-174 dBm/Hz, so that the accumulated energy of the white noise is unchanged in a certain time, and more energy is accumulated by the useful signal, and the signal-to-noise ratio can be improved. For the interference signals in the 2.4G WIFI frequency band, the interference signals are not random noise, and even if the accumulation time is prolonged, the energy of useful signals and the energy of the interference signals are accumulated more, so that the signal-to-noise ratio cannot be effectively improved through time accumulation, and out-of-band interference signals cannot be filtered. In the low power consumption wake-up receiver shown in fig. 6, the same frequency interference problem exists because a part of the existing communication frequency band is multiplexed to transmit the wake-up sequence. For example, when the wake-up sequence adopts a 2.4G frequency band, the wake-up sequence may be interfered by a 2.4G WIFI signal, a 2.4G bluetooth low energy (bluetooth low energy, BLE) signal and a 2.4G industrial-scientific-medical (ISM) signal existing in the space, especially when the 2.4G WIFI signal has a bandwidth of 20MHz, a transmission frequency band of the wake-up sequence is covered, which may cause interference to the transmission of the wake-up sequence, resulting in false wake-up caused by the interference signal, or a situation that the receiver cannot accurately identify the wake-up sequence and cannot wake up the receiver in time, which affects the communication quality between devices.

The application provides a low-power consumption wake-up circuit which is applied to a receiver and can be used in a communication module. The communication module may be a bluetooth module, a WIFI module, or other communication modules. The receiver also includes a main receive path. The main receiving path is connected with the main chip and is used for transmitting the received signal to the main chip for processing. Typically, the communication module may be in a dormant state (or referred to as an off state) with both the primary receive path and the primary chip without network communication. While the low power wake-up circuit may be in an on state for listening to the broadcast signal. The standby power consumption of the equipment can be reduced due to the low standby power consumption of the low-power consumption wake-up circuit. When the low-power consumption wake-up circuit monitors the broadcast signal, a wake-up signal can be output to the main chip to wake-up the main chip and the main receiving channel to be switched from the dormant state to the working state. The low-power consumption wake-up circuit comprises the narrow-band filter and the low-power consumption receiving path, and the pass band of the narrow-band filter is narrow, so that interference signals with frequencies outside the pass band can be effectively filtered, the anti-interference capability of the low-power consumption wake-up circuit is improved, and the wake-up success rate is further improved.

Fig. 8 shows an application scenario of a low-power wake-up circuit according to an embodiment of the present application. In fig. 8, a device in a standby state may be referred to as a wakened object 802, and a device that initiates a connection request is exemplified by a cell phone 801. The handset 801 may be a device employing multi-carrier amplitude keying (MC-OOK) technology. As shown in fig. 8, when the user at the mobile phone end needs to establish network communication between the mobile phone 801 and the awakened object 802 (in fig. 8, bluetooth communication is established as an example), the mobile phone 801 may be operated, and a connection request is sent through a communication module and an antenna in the mobile phone 801, and the request may be sent in a broadcast signal form. The frequency of the broadcast signal is in the passband range of the narrow-band filter of the low-power consumption wake-up circuit, so that the broadcast signal can be received by the antenna of the wakened object, the out-of-band interference signal can be filtered by the narrow-band filter, and the broadcast signal enters the low-power consumption receiving path, so that the wake-up signal is generated. Then, the wake-up signal output by the low power consumption receiving path can be input to the main chip to wake up the main chip. Alternatively, the main receiving path may also enter the post-wake-up operating state after the main chip is woken up.

In some embodiments, the wake-up signal output by the low-power receiving channel may also be directly input to the main receiving channel to wake up the main receiving channel to enter the working state, which is not limited in the embodiments of the present application. When the main chip and the main receiving channel are awakened, bluetooth communication can be established between the awakened object 802 and the mobile phone 801.

Alternatively, the main receive path shown in wakening object 802 in fig. 8 may be generally referred to as a radio frequency front-end module, and may include, for example, an amplifier, a mixer, a filter, and other radio frequency devices for processing radio frequency signals.

It should be noted that, in the embodiment of the present application, the main receiving path is a path having a function of processing a received signal, but the main receiving path is not necessarily a path that processes only a received signal, and may be a circuit designed to be compatible with a transmitting path, and may also be used for processing a transmitting signal. The main receiving path may also include devices and connection manners required by other transmitting paths under the condition of being compatible with the transmitting path, which are not described herein. The receiver according to the embodiment of the present application is a module having a receiving function, and does not necessarily refer to a module that processes a received signal alone, but may be a module designed to be compatible with a transmitter, or may be used to process a transmitted signal. The receiver may also include other devices and connection manners required by the transmitter in the case of a compatible transmitter, which are not described herein.

In fig. 8, the flow of information interaction between the mobile phone 801 and the awakened object 802 may also be shown in fig. 9, in which, in order to emphasize the information and timing of interaction between the modules, the mobile phone 801 is shown in a form of a transmitting end, and the awakened object 802 is shown in fig. 9 to include a low-power-consumption awakening circuit, a main chip, and a main receiving path. As shown in fig. 9, the main chip and the main reception path are normally in a sleep state (off state), without causing power loss; when the sending end broadcasts the wake-up sequence, the low-power wake-up circuit in the monitoring state can receive the wake-up sequence through the antenna. Then, the low power consumption wake-up circuit may output a wake-up signal to the main chip and the main reception path after checking the wake-up sequence. At this time, the main chip and the main receiving channel can be switched from the dormant state to the working state, and a communication connection is established with the transmitting end, so as to realize communication interaction.

For easy understanding, the following embodiments of the present application will take a terminal device having a structure shown in fig. 1 and fig. 2 as an example, and specifically describe a structure and an operating principle of the low power consumption wake-up circuit provided by the embodiments of the present application with reference to the accompanying drawings and application scenarios.

Fig. 10 is a schematic circuit diagram of a low power consumption wake-up circuit according to an embodiment of the present application, where the low power consumption wake-up circuit shown in fig. 10 includes a narrowband filter 1001 and a low power consumption receiving path 1002. One end of the narrowband filter 1001 is connected to an antenna, and the other end is connected to the low power consumption receiving path 1002, and the specific structure of the low power consumption receiving path 1002 is not limited. When the object to be waken is in the standby state, the main receiving channel and the main chip of the object to be waken are in the dormant state, and the low-power consumption wake-up circuit is in the monitoring state, so that the broadcast signal broadcasted by the transmitting end can be monitored, the interference signal in the broadcast signal accompanying space enters the low-power consumption wake-up circuit and is filtered by the narrow-band filter 1001, and the out-of-band interference signal is filtered (i.e. suppressed). The filtered broadcast signal enters the low-power consumption receiving path 1002, if the wake-up sequence carried by the broadcast signal is matched with the preset sequence, it is indicated that the transmitting end for transmitting the broadcast signal is a device paired with the object to be waken, so that the low-power consumption wake-up circuit can output the wake-up signal to wake up the object to be waken. The preset sequence may be a logic level with alternating high and low, for example, a binary number sequence such as 0101101, and the embodiment of the present application does not limit the number and content of the bits of the preset sequence, so long as the number and content can represent the identity of the transmitting end. If the wake-up sequence carried by the received broadcast signal is not matched with the preset sequence, the wake-up sequence carried by the broadcast signal is not used for waking up the object to be waked, the transmitting end for transmitting the broadcast signal is not a device matched with the object to be waked up, and the low-power wake-up circuit does not output the wake-up signal. The preset sequence may be a sequence stored in the low power consumption wake-up circuit in advance, and represents the identity of the transmitting end paired with the object to be waken up.

In the low power consumption wake-up circuit shown in fig. 10, since the narrowband filter has a characteristic of a narrow passband, the frequency of the interference signal is more likely to fall outside the passband of the narrowband filter. The narrow-band filter can effectively filter most of interference signals outside the passband, so that the interference signals are prevented from entering the low-power-consumption receiving path, the anti-interference capability of the low-power-consumption wake-up circuit is enhanced, and the wake-up success rate is improved. Meanwhile, the accuracy of the low-power consumption wake-up circuit for identifying the sequence carried by the broadcast signal is improved, so that the accuracy of the output wake-up signal is correspondingly improved, false wake-up caused by interference signals can be avoided, the communication quality between devices is improved, and the user experience is improved. In addition, compared with the scheme adopting a low duty ratio, the low-power consumption wake-up circuit shown in the a diagram in fig. 10 has lower delay, and higher timeliness of outputting the wake-up signal under the condition of ensuring low standby power consumption, thereby avoiding the condition of untimely wake-up and improving user experience.

The narrowband filter 1001 in the embodiment of the present application may be an ultra-narrowband filter, for example, a filter with a passband having a bandwidth in KHz level. In one implementation, the ultra-narrow band filter may consist of a higher harmonic bulk acoustic wave resonator (HBAR) 10011 and a Band Pass Filter (BPF) 10012 in series as shown in a diagram a in fig. 11.

In some embodiments, the interval between any two adjacent resonant frequencies of the higher harmonic bulk acoustic wave resonator may be in the range of 10MH to 100MHz, the bandwidth of the resonant frequency of the higher harmonic bulk acoustic wave resonator may be in the range of 50KHz to 1000KHz, and the difference between the passband bandwidth of the bandpass filter and the interval between any two adjacent resonant frequencies of the higher harmonic bulk acoustic wave resonator is less than a preset difference.

The difference between the passband bandwidth of the bandpass filter and the interval between any two adjacent resonant frequencies of the higher harmonic bulk acoustic wave resonator is smaller than a preset difference value, which means that the difference between the passband bandwidth of the bandpass filter and the interval between the two adjacent resonant frequencies is smaller, and the bandpass filter can gate a signal of one resonant frequency of the higher harmonic bulk acoustic wave resonator, so that most of interference signals are filtered, ultra-narrow band filtering is realized, and the anti-interference capability of a low-power consumption wake-up circuit is improved.

Wherein, the HBAR is a resonator with a frequency response curve having a plurality of repeated narrow peaks, each of the narrow peaks corresponds to a resonant frequency, the interval between any two adjacent resonant frequencies of the higher harmonic bulk acoustic wave resonator is 20MHz, the bandwidth of the resonant frequency of the higher harmonic bulk acoustic wave resonator is 120KHz, the passband bandwidth of the bandpass filter is 20MHz, and the frequency response curve of the HBAR can be shown by referring to the c-chart in fig. 11. Since HBAR has an extremely high quality factor (Q value), a bandwidth with an extremely narrow resonance frequency can be realized. For example, in the case where the Q value of HBAR is more than 20000, the bandwidth of each resonance frequency may be as narrow as 120KHz when the center frequency is around 2.4 GHz. Wherein the frequency spacing between adjacent resonant frequencies of the HBAR can be adjusted by adjusting the thickness of the HBAR substrate to accommodate different requirements. The BPF is disposed at the rear end of the HBAR in the ultra-narrow band filter, and one or more of the multiple repeated narrow peaks of the HBAR may be gated, i.e., one or more resonant frequencies may be gated. Wherein the frequency response curve of the BPF can be seen in fig. 11 as b-chart. The center frequency of the passband of the BPF and the passband bandwidth determine what the resonance frequency of the gating HBAR is, in fig. 11, the passband bandwidth of the BPF is 20MHz, the HBAR frequency is a frequency response graph of overlapping the adjacent resonance frequencies HBAR and BPF, when the HBAR and BPF are connected in series, the center frequency of the passband of the BPF and one of the resonance frequencies HBAR are close, so that the signal of the resonance frequency can be gated, and the ultra-narrow band filtering function is realized. The a-diagram in fig. 11 shows the HBAR10011 in front and the BPF10012 in back, in other embodiments HBAR10012 and BPF10011 may also be interchanged, e.g. as shown in the e-diagram in fig. 11, with the BPF10012 in front and the HBAR10011 in back. That is, the received signal is filtered by the BPF10012 to remove the interference signal at the far end of the passband, and then filtered by the HBAR10011 to remove the interference signal at the near end, so as to realize the narrow-band filtering. Optionally, the ultra-narrow band filter may further include a matching network, where the matching network may be T-type, L-type or pi-type, and the embodiment of the present application is not limited as long as the matching network can perform an impedance tuning function on the ultra-narrow band filter.

The structure of the narrow-band filter and the principle of narrow-band filtering in the low-power wake-up circuit are described in the foregoing, and the circuit structure of the low-power receive path in the low-power wake-up circuit will be described in detail.

In some embodiments, the specific structure of the low power consumption reception path 1002 in the low power consumption wake-up circuit may be as shown in a diagram a in fig. 12, including: mixer 10021, intermediate frequency filter 10022, analog-to-digital conversion circuit (analog to digital converter, ADC) 10023, correlator 10024. The ADC may be a comparator, among others. After the broadcast signal passes through the narrowband intermediate frequency filter 1001, the broadcast signal can be split into two paths to enter the local oscillator port and the radio frequency port of the mixer 10021 respectively for self-mixing, and the self-mixed broadcast signal is output by the intermediate frequency port of the mixer 10021 and filtered by the intermediate frequency filter 10022 for multiple harmonics, so as to obtain an intermediate frequency analog signal. The intermediate frequency analog signal enters an ADC to carry out analog-to-digital conversion, and a digital signal is obtained. The digital signal is decoded into correlator 10024 to obtain a wake-up sequence. The correlator 10024 compares the decoded wake-up sequence with a preset sequence stored in the correlator 10024, and if the two sequences match, a wake-up signal may be output, which may be a high level; if the two do not match, the wake-up signal may not be output, or a low level may be output. Optionally, judging whether the two sequences match or not, which may be judging whether the two sequences are consistent or not, if so, considering that the two sequences match; if not, the two sequences are considered to be mismatched. In some embodiments, when two sequences are compared, a partial bit comparison mode can be adopted, for example, if the first N bits of the wake-up sequence and the first N bits of the preset sequence are found to be inconsistent in the comparison process, the comparison of the later bits is not needed, and the two are directly determined to be not matched. Optionally, the plurality of awakenings may be further divided into a Group, and the plurality of awakenings included in the Group correspond to the same Group identifier (Group ID). The Group ID may also be a preset sequence. If the received wake-up sequence matches the Group ID, then the two sequences are deemed to match. When multiple wakeups within the same Group all receive the Group ID, the multiple wakeups can all be woken up.

In some cases, the signal strength received by the antenna may be weak, so the low power consumption reception path 1002 in the low power consumption wake-up circuit may further include an amplifier 10025, and the broadcast signal is amplified and then processed. The amplifier 10025 is added to amplify the broadcast signal, so that the problem that the broadcast signal cannot be accurately decoded due to too low intensity of the received broadcast signal can be avoided, and the low-power consumption wake-up circuit can effectively and accurately analyze the broadcast signal even if the distance from a transmitting end is far or the antenna performance is poor, so that the use scene of the low-power consumption wake-up circuit is wider.

For example, the specific structure of the low power consumption reception path 1002 including the amplifier 10025 may be shown as b diagram in fig. 12, including: mixer 10021, amplifier 10025, intermediate frequency filter 10022, ADC10023 and correlators 10024. When the broadcast signal passes through the narrowband filter 1001, it enters the local oscillator port and the radio frequency port of the mixer 10021 respectively to perform self-mixing, and after self-mixing, it is output by the intermediate frequency port of the mixer 10021 and amplified by the amplifier 10025, and then the harmonic wave is filtered for multiple times by the intermediate frequency filter 10022, so as to obtain the intermediate frequency analog signal. Then, the intermediate frequency analog signal enters the ADC10023 to perform analog-to-digital conversion, so as to obtain a digital signal. The amplifier 10025 may be a baseband low noise amplifier (baseband low noise amplifier, BB-LNA) to ensure a high signal-to-noise ratio of the amplified signal. Since the signal output by the intermediate frequency port of mixer 10021 contains multiple harmonics generated by the mixing, not all of these harmonics are useful signals. If the mixed multiple harmonics are filtered and then amplified, the gain of the amplifier 10025 for the unwanted harmonics (which may be referred to as interference signals or spurious signals) previously suppressed by the intermediate frequency filter 10022 may be greater than the gain of the intermediate frequency analog signal to be amplified, resulting in a stronger spurious signal. The circuit structure in which the intermediate frequency filter 10022 is disposed after the amplifier 10025 as shown in the b diagram in fig. 12 can ensure a high degree of suppression of unwanted harmonics (generally, the degree of suppression of the stop band of the intermediate frequency filter 10022 can be achieved) and ensure a low intensity of the output spurious signals, thereby improving the accuracy of the wake-up signal output by the low power consumption wake-up circuit and further improving the wake-up success rate.

As another example, the positions of the amplifier 10025 and the intermediate frequency filter 10022 in the b diagram in fig. 12 may be interchanged, and then the specific structure of the low power consumption receiving path 1002 may be as shown in the c diagram in fig. 12, where the broadcast signal output by the narrowband filter 1001 sequentially passes through the mixer 10021, the intermediate frequency filter 10022, the amplifier 10025, the ADC10023 and the correlator 10024. When the broadcast signal passes through the narrowband filter 1001, the broadcast signal can be first split into two paths to enter the local oscillator port and the radio frequency port of the mixer 10021 respectively for self-mixing, and after self-mixing, the broadcast signal is output by the intermediate frequency port of the mixer 10021 and enters the intermediate frequency filter 10022 for filtering multiple harmonics, so as to obtain an intermediate frequency analog signal, and then enters the amplifier 10025 for amplification, wherein the amplifier 10025 can adopt BB-LNA. Then, the intermediate frequency analog signal enters the ADC10023 to perform analog-to-digital conversion, so as to obtain a digital signal. The circuit structure shown in the c diagram of fig. 12, in which the intermediate frequency filter 10022 is disposed before the amplifier 10025, can ensure that the strength of the signal input to the amplifier 10025 is low except for the intermediate frequency analog signal, can ensure that the amplifier has sufficient gain for the intermediate frequency analog signal, cannot waste the power consumption of the amplifier 10025 due to amplifying other unwanted harmonics at the same time, and avoids the situation of insufficient gain for the useful intermediate frequency analog signal.

The mixer in the low-power wake-up circuit only generates gate current (gate current), the power consumption is extremely low, and the use of a VCO and a radio frequency LNA is avoided in the low-power wake-up circuit. The standby power consumption can be reduced to be within 10uW, and the low-power standby state can be realized.

The circuit configuration including a narrow band filter and a low power consumption reception path in the low power consumption wake-up circuit is shown in fig. 10 and 12. In some embodiments, the low-power wake-up circuit may further include a plurality of narrowband filters and a plurality of low-power receive paths in a one-to-one correspondence, where each narrowband filter is connected to a corresponding low-power receive path to form a channel. When the number of the narrowband filters 1001 and the low power consumption reception paths 1002 in the low power consumption wake-up circuit is plural, then the low power consumption wake-up circuit may further include a voting circuit 1003, for example, as shown in fig. 13 and 14, three narrowband filters (1001-a, 1001-B, and 1001-C) and three low power consumption reception paths (1002-a, 1002-B, and 1002-C) are illustrated in fig. 13 and 14, respectively (i.e., three channels are illustrated). In fact, the number of low-power receiving paths in the low-power wake-up circuit may be two, four, five or other, and the number of corresponding narrowband filters may be two, four, five or other, which is not limited by the embodiment of the present application. The three channels work simultaneously, wherein the passband frequency of each narrow-band filter is different, and broadcast signals with different frequencies can be respectively gated. When the pass band frequency of an interference signal existing in a space and one of the narrowband filters is close to or even the same as each other, if a broadcast signal that can be gated using the pass band frequency of the narrowband filter is interfered by the interference signal. At this time, the transmitting end can change the frequency of the original broadcast signal, and one of the passband frequencies of other narrowband filters is adopted to transmit the broadcast signal, i.e. the interference channel is avoided, so that the interference of the interference signal is avoided. The transmitting end can alternatively transmit broadcast signals of different frequencies. For example, the transmitting end time-divisionally transmits broadcast signals of three frequencies corresponding to frequencies of pass bands of narrowband filters of channels 1001-a,1001-B, 1001-C. For example, if the signals of three frequencies transmitted by the transmitting end in a time-sharing manner are broadcast signals of 2405MHz, 2442MHz and 2479MHz, respectively, the center frequencies of the pass bands of the narrowband filters of the three channels may be 2405MHz, 2442MHz and 2479MHz, respectively.

The number of the narrow-band filters in the low-power consumption wake-up circuit can be two or three, and the number of the low-power consumption receiving paths in the low-power consumption wake-up circuit can be correspondingly two or three, so that the anti-interference performance and the circuit cost can be balanced, and the low-power consumption wake-up circuit is more reasonable.

The input terminal of the voting circuit in fig. 13 is connected to each low-power consumption receiving path, and the output terminal of the voting circuit is used for generating a wake-up signal according to the results output by the low-power consumption receiving paths. The number of inputs to the voting circuit may be greater than or equal to the number of narrow band filters. Alternatively, the voting circuit may be a two-way or three-way input OR circuit, such as an OR gate. Taking a three-way input voting circuit as an example, when one low-power consumption receiving channel outputs a high level in the three-way input signal, the voting circuit can output the high level as a wake-up signal, the situation that the wake-up signal cannot be accurately output because the frequencies of the interference signal and a broadcast signal are the same or similar is avoided, the interference signal is avoided, and therefore the anti-interference capability is improved, and meanwhile the wake-up success rate is improved.

Alternatively, the voting circuit may be a two-way or three-way input AND circuit, such as an AND gate. The number of inputs to the voting circuit may be greater than or equal to the number of narrow band filters. Taking a three-way input voting circuit as an example, when three low-power consumption receiving paths output high levels in three-way input signals, the voting circuit can output the high levels as wake-up signals. That is, only when the transmitting end transmits three broadcast signals with different frequencies respectively, the wake-up signal is output, so that false wake-up caused by interference signals can be avoided, and the accuracy of outputting the wake-up signal is improved. In order to facilitate understanding of the above-described circuit structure in fig. 14, fig. 15 divides the circuit structure shown in fig. 14 according to the basic functions of the circuit, including: radio frequency circuitry, baseband analog circuitry, and baseband digital circuitry. The narrow-band filter and the related matching network can be collectively called a filtering matching network and work in a radio frequency band, and belong to a radio frequency circuit; the mixer, the amplifier, the intermediate frequency filter and the comparator work in an intermediate frequency band, and belong to a baseband analog circuit; the correlator and voting circuit belong to the baseband digital circuit.

In some embodiments, the low power wake-up circuit may use different antennas with the applied receiver. In other embodiments, the low power wake-up circuit may also use the same antenna as the applied receiver and be switched by a switch. Specifically, the switch is connected with the low-power consumption wake-up circuit, the main receiving path and the antenna respectively, and is used for communicating the antenna and the main receiving path when the low-power consumption wake-up circuit outputs a wake-up signal. In some embodiments, the switch may also be other types of switches, such as a single pole three throw switch, a double pole double throw switch, etc., as long as the switch can achieve switching of the main structural path and the low power consumption wake-up circuit; in some embodiments, the switch may also share other switches in other functional modules or part of the paths in other switches, so long as the circuit can be ensured to function normally. In a standby state, the switch is communicated with the low-power consumption wake-up circuit and the antenna; when the voting circuit outputs a wake-up signal, the main chip is waken up, and the switch can be switched to a state of communicating the antenna and the main receiving path under the control of the main chip, so that the receiver is switched from a dormant state to a working state. In some embodiments, in the standby state, the switch is in a non-energized state, at which time the switch defaults to connect the low power wake-up circuit and the antenna, and is energized to connect the antenna and the main receive path when the wake-up signal is generated, so that in the standby state, the switch is not energized, thereby further saving standby power. The switch in fig. 16 is exemplified by a single pole double throw switch, the common terminal of which is connected to the antenna, and the other two terminals of which are respectively connected to the main receiving path and the narrow band filter of the low power consumption wake-up circuit. The switch is used for gating the main receiving path and the low-power consumption wake-up circuit, so that antenna multiplexing can be realized, the structure of the existing communication system is not required to be changed, the number of antennas is saved, and the cost and the difficulty of antenna design are reduced.

Examples of the low power wake-up circuit and the receiver incorporating the same provided by the present application are described in detail above. It will be appreciated that the corresponding electronic device, in order to implement the above-described functions, comprises corresponding hardware structures for performing the respective functions.

In an actual use scenario, there is a certain temperature drift of the passband frequency of the filter, i.e. the passband frequency shifts with temperature. For the narrowband filter in the embodiment of the application, when the narrowband filter has temperature drift under the condition of environmental temperature change, the broadcast signal is likely to fall into the stop band of the narrowband filter directly, so that the broadcast signal cannot be restrained by the narrowband filter and cannot wake up a receiver. The embodiment of the application provides a mechanism for repeated transceiving, wherein the frequency points of a broadcast signal sent by a sending end are set as adjustable frequency points, the adjustable frequency points can cover the temperature drift range of a narrow-band filter, and then the sending end performs repeated round-robin transmission in the adjustable frequency points. Even if the narrow-band filter generates temperature drift, the transmitting end always transmits a broadcast signal falling in the passband of the narrow-band filter after the transmission, so as to output a wake-up signal. The method can avoid the situation that the receiver cannot be accurately awakened due to temperature drift, improves the temperature range suitable for the low-power consumption awakening circuit, and has wider application scenes.

Fig. 17 is a flowchart of an example of a wake-up sequence sending method provided by an embodiment of the present application, where the first electronic device may be a sending end of a broadcast signal, where the broadcast signal carries a wake-up sequence, where the wake-up sequence can characterize an identity of the first electronic device, the first electronic device is configured to send the wake-up sequence to a second electronic device, and the second electronic device includes a low-power wake-up circuit, where the low-power wake-up circuit includes at least one narrowband filter. The method comprises the following steps:

S1701, the first electronic equipment receives a connection instruction, wherein the connection instruction is used for indicating the first electronic equipment and the second electronic equipment to establish network connection.

S1701, responding to a connection instruction, and respectively sending a wake-up sequence to the second electronic device by the first electronic device according to a plurality of frequencies in a preset frequency set.

When the user needs to connect the mobile phone as the first electronic device with the bluetooth headset as the second electronic device, a connection instruction may be input to the first electronic device, for example, clicking the identifier of the bluetooth headset in the first electronic device. The mobile phone receives a connection instruction triggered by clicking operation of a user, and can repeatedly transmit broadcast signals carrying wake-up sequences according to adjustable frequency points capable of covering the temperature drift range of the narrow-band filter.

For example, the plurality of frequencies are frequencies in a preset frequency set, and the plurality of frequencies in the preset frequency set can cover a first frequency range, where the first frequency range is a drift range of a center frequency of a passband of the narrowband filter within a preset temperature range, or may be a drift range of a center frequency of a passband of the narrowband filter within a preset temperature range. Any two adjacent frequencies in the preset frequency set are different by a preset bandwidth. Alternatively, the above-mentioned preset temperature range may be a range of-20 degrees to 60 degrees.

Optionally, when the low power consumption wake-up circuit includes a narrowband filter, the first frequency range may be a drift range of a frequency or a center frequency of a passband of the narrowband filter within a preset temperature range; when the low power consumption wake-up circuit includes a plurality of narrowband filters, the first frequency range may be a sum of ranges of drift ranges of frequencies of pass bands or center frequencies of the plurality of narrowband filters within a preset temperature range.

Optionally, the preset bandwidth may be a value within a range of 50KHz-1000Hz, so long as the preset bandwidth is the same as or similar to the passband bandwidth of the narrowband filter in the low-power consumption wake-up circuit, so that the broadcast signal sent according to the preset bandwidth can be ensured to normally enter the low-power consumption wake-up circuit for analysis.

Alternatively, the above-mentioned preset temperature range may be a range of-20 degrees to 60 degrees.

In particular, the temperature coefficient of a typical RF filter is-26 ppm (parts per million parts per million). Taking a temperature coefficient of the narrow-band filter of-26 ppm as an example, in a temperature range of-20 degrees to 60 degrees, the frequency offset of the narrow-band filter is as follows: 26ppm [60- (-20) ] degrees f ₀. Taking f ₀ as 2450MHz as an example, the frequency offset is: 26ppm [60- (-20) ] 2450 mhz=5.096 MHz ≡5.2MHz (the range of frequency offset leaves some margin in view of the errors in the processing of the hardware circuit). If a 120KHz narrowband filter is used, 5.2MHz/120KHz 44, the passband frequency of the narrowband filter varies between about 2447.36MHz to 2452.64 MHz. The transmitting end may transmit, in a frequency range of 2447.36MHz to 2452.64MHz, at intervals of 120KHz, for example, 2447.36MHz, 2447.48MHz, 2447.60MHz, 2447.72MHz, 2447.84MHz, 2448.96MHz, up to 2452.64MHz, 45 times in total. Of course, other narrow-band filters have the same deviation of center frequency under different temperature changes, and the transmitting end can calculate the frequency point of the transmitted broadcast signal and transmit the broadcast signal by referring to the method, so that the situation that the receiver cannot be accurately awakened due to temperature drift can be avoided, the temperature range suitable for a low-power consumption awakening circuit is improved, and the application scene is wider.

Optionally, the transmitting end may collect a common temperature range, for example, 0-30 degrees, and transmit a frequency point corresponding to the temperature range of 0-30 degrees, where the calculation mode may be 26ppm (30-0) degrees 2450 mhz= 1.911mhz≡2MHz (considering the error of the processing technology of the hardware circuit, the range of the frequency offset leaves a certain margin), and 2MHz/120khz≡16. The transmitting end may transmit in a frequency range of 2449.04MHz to 2450.96MHz at frequency intervals of 120KHz, for example, 2449.04MHz, 2449.16MHz, 2449.28MHz, sequentially, up to 2450.96MHz, for a total of 17 transmissions. Therefore, the number of times of transmission can be reduced while the common temperature is covered, so that a round of broadcast signals can be rapidly transmitted, the delay of awakening operation is reduced, and the awakening efficiency is improved.

After receiving the broadcast signal carrying the wake-up sequence sent by the first electronic device, the second electronic device may process the broadcast signal with reference to the description in the foregoing embodiment, and identify the wake-up sequence, which is not described herein.

The above describes in detail an example of the wake-up sequence transmission method provided by the present application. It is to be understood that the corresponding means, in order to carry out the functions described above, comprise corresponding hardware structures and/or software modules for carrying out the respective functions. Those of skill in the art will readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The present application may divide the wake-up sequence transmitting device into functional modules according to the above method example, for example, each function may be divided into each functional module, or two or more functions may be integrated into one module. The integrated modules may be implemented in hardware or in software functional modules. It should be noted that, the division of the modules in the present application is illustrative, and is merely a logic function division, and other division manners may be implemented in practice.

Fig. 18 shows a schematic structural diagram of a wake-up sequence sending device provided by the present application. The apparatus 1800 is applied to a first electronic device, the first electronic device configured to send a wake-up sequence to a second electronic device, the wake-up sequence configured to characterize an identity of the first electronic device, the second electronic device comprising a low power wake-up circuit, the low power wake-up circuit comprising at least one narrowband filter; the apparatus 1800 includes:

The receiving module 1801 is configured to control the first electronic device to receive a connection instruction, where the connection instruction is used to instruct the first electronic device and the second electronic device to establish a network connection.

A sending module 1802, configured to control a first electronic device to send a wake-up signal to a second electronic device according to a plurality of frequencies in a preset frequency set, respectively, in response to a connection instruction; the plurality of frequencies are frequencies in a first frequency range, the preset frequency set comprises a first frequency and a second frequency, the first frequency and the second frequency differ by a preset bandwidth, the first frequency is any one of the plurality of frequencies, the second frequency is different from the first frequency, and the first frequency range is a drift range of the center frequency of the passband of the at least one narrow-band filter in a preset temperature range.

The specific manner in which the apparatus 1800 performs the wake-up sequence transmission method and the resulting beneficial effects may be referred to in the related description of the method embodiments, and are not described herein.

The embodiment of the application also provides electronic equipment, which comprises the processor. The electronic device provided in this embodiment may be the terminal device 100 shown in fig. 1, and is configured to perform the wake-up sequence sending method described above. In case of an integrated unit, the terminal device may comprise a processing module, a storage module and a communication module. The processing module may be configured to control and manage actions of the terminal device, for example, may be configured to support the terminal device to execute steps executed by the display unit, the detection unit, and the processing unit. The memory module may be used to support the terminal device to execute stored program codes, data, etc. And the communication module can be used for supporting the communication between the terminal equipment and other equipment.

Wherein the processing module may be a processor or a controller. Which may implement or perform the various exemplary logic blocks, modules and circuits described in connection with this disclosure. A processor may also be a combination that performs computing functions, e.g., including one or more microprocessors, digital Signal Processing (DSP) and a combination of microprocessors, and the like. The memory module may be a memory. The communication module can be a radio frequency circuit, a Bluetooth chip, a Wi-Fi chip and other equipment which interact with other terminal equipment.

In an embodiment, when the processing module is a processor and the storage module is a memory, the terminal device according to this embodiment may be a device having the structure shown in fig. 1.

The embodiment of the application also provides a computer readable storage medium, in which a computer program is stored, which when executed by a processor, causes the processor to execute the wake-up sequence sending method according to any one of the above embodiments.

The embodiment of the application also provides a computer program product, which when running on a computer, causes the computer to execute the related steps so as to realize the wake-up sequence sending method in the embodiment.

The electronic device, the computer readable storage medium, the computer program product or the chip provided in this embodiment are used to execute the corresponding method provided above, so that the beneficial effects thereof can be referred to the beneficial effects in the corresponding method provided above, and will not be described herein.

In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of modules or units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another apparatus, or some features may be omitted or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with respect to each other may be an indirect coupling or communication connection via interfaces, devices, or units, and the replacement units may or may not be physically separate, and the components shown as units may be one physical unit or multiple physical units, that is, may be located in one place, or may be distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a readable storage medium. Based on such understanding, the technical solution of the embodiments of the present application may be essentially or a part contributing to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions for causing a device (may be a single-chip microcomputer, a chip or the like) or a processor (processor) to perform all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read Only Memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims

1.A low power wake-up circuit for use in a receiver, said circuit comprising: the device comprises at least one narrow-band filter and at least one low-power-consumption receiving path, wherein the at least one narrow-band filter corresponds to the at least one low-power-consumption receiving path one by one;

the first narrow-band filter is respectively connected with the antenna and a first low-power-consumption path corresponding to the first narrow-band filter, the first narrow-band filter is any one of the at least one narrow-band filter, and the first low-power-consumption path is one of the low-power-consumption receiving paths.

2. The circuit of claim 1, wherein the at least one low power receive path is configured to output a wake-up signal when a wake-up sequence carried by a signal received by the antenna matches a preset sequence.

3. The circuit of claim 2, wherein the first narrowband filter comprises: a higher harmonic bulk acoustic resonator and a bandpass filter;

The high-order harmonic bulk acoustic wave resonator is respectively connected with the antenna and the band-pass filter, and the band-pass filter is connected with the first low-power-consumption receiving path; or alternatively

The band-pass filter is respectively connected with the antenna and the higher harmonic bulk acoustic wave resonator, and the higher harmonic bulk acoustic wave resonator is connected with the first low-power-consumption receiving path.

4. A circuit according to claim 3, wherein the interval between any two adjacent resonant frequencies of the higher harmonic bulk acoustic wave resonator is in the range of 10MHz to 100MHz, the bandwidth of the resonant frequency of the higher harmonic bulk acoustic wave resonator is in the range of 50KHz to 1000KHz, and the difference between the passband bandwidth of the bandpass filter and the interval between any two adjacent resonant frequencies of the higher harmonic bulk acoustic wave resonator is less than a preset difference.

5. The circuit of claim 3 or 4, wherein the first low power receive path comprises: the device comprises a mixer, an intermediate frequency filter, an analog-to-digital conversion circuit and a correlator;

the mixer is used for carrying out self-mixing on the wake-up signal filtered by the first narrow-band filter and transmitting a signal generated by the self-mixing to the intermediate frequency filter;

the intermediate frequency filter is used for filtering the signals output by the mixer and transmitting intermediate frequency analog signals obtained by filtering to the analog-to-digital conversion circuit;

the analog-to-digital conversion circuit is used for converting the intermediate frequency analog signal into a digital signal and transmitting the digital signal to the correlator;

the correlator is used for comparing the wake-up sequence carried by the digital signal with the preset sequence and outputting a first matching result.

6. The circuit of claim 5, wherein the first low power receive path further comprises: the analog-to-digital conversion circuit is a comparator;

the low noise amplifier is used for amplifying the intermediate frequency analog signal;

The comparator is used for converting the intermediate frequency analog signal after filtering and amplifying into the digital signal.

7. The circuit of claim 5 or 6, wherein the number of the at least one low power receive path is a plurality, the circuit further comprising: a voting circuit;

And the voting circuit is used for outputting the wake-up signal according to the first matching results output by the correlators of the plurality of low-power-consumption receiving paths.

8. The circuit of claim 7, wherein the voting circuit is an or gate.

9. The circuit of claim 7, wherein the voting circuit is an and gate.

10. The circuit according to any one of claims 1 to 9, wherein the number of the at least one narrow-band filter is plural, and the passband frequencies of each of the narrow-band filters are different.

11. The circuit of claim 10, wherein the number of the at least one narrow band filter is two or three.

12. A receiver comprising a main receive path and a low power wake-up circuit as claimed in any one of claims 1 to 11.

13. The receiver of claim 12, wherein the receiver further comprises: a switch;

The switch is respectively connected with the low-power consumption wake-up circuit, the main receiving path and the antenna;

And the switch is used for communicating the antenna and the main receiving path when the low-power consumption wake-up circuit outputs a wake-up signal.

14. The receiver of claim 13, wherein the switch is a single pole double throw switch, a common terminal of the single pole double throw switch being connected to the antenna.

15. The wake-up sequence sending method is characterized by being applied to first electronic equipment, wherein the first electronic equipment is used for sending a wake-up sequence to second electronic equipment, the wake-up sequence is used for representing the identity of the first electronic equipment, the second electronic equipment comprises a low-power wake-up circuit, and the low-power wake-up circuit comprises at least one narrow-band filter;

The method comprises the following steps:

The first electronic equipment receives a connection instruction, wherein the connection instruction is used for indicating the first electronic equipment and the second electronic equipment to establish network connection;

Responding to the connection instruction, and respectively sending the wake-up sequence to the second electronic device by the first electronic device according to a plurality of frequencies in a preset frequency set;

The first frequency is any one of the plurality of frequencies, the second frequency is different from the first frequency, and the first frequency range is a drift range of a frequency of a passband of the at least one narrowband filter in a preset temperature range.

16. The method of claim 15, wherein the predetermined bandwidth is in the range of 50KHz to 1000KHz.

17. The method of claim 16, wherein the predetermined bandwidth is 120KHz and the number of the plurality of frequencies in the predetermined set of frequencies is 45.

18. An electronic device comprising a low power wake-up circuit as claimed in any one of claims 1 to 11 or comprising a receiver as claimed in any one of claims 12 to 14.

19. An electronic device, comprising: a processor, a memory, and an interface;

The processor, the memory and the interface cooperate to cause the electronic device to perform the method of any of claims 15 to 17.

20. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program which, when executed by a processor, causes the processor to perform the method of any of claims 15 to 17.