WO2023103265A1

WO2023103265A1 - Brainwave sensing headphones

Info

Publication number: WO2023103265A1
Application number: PCT/CN2022/089929
Authority: WO
Inventors: 彭信龙; 郭世文; 杨卉; 何桂晓; 曹磊; 吴海全
Original assignee: 深圳市飞科笛系统开发有限公司
Priority date: 2021-12-07
Filing date: 2022-04-28
Publication date: 2023-06-15
Also published as: CN114222218A

Abstract

The present application relates to electronic circuits, and provides a brainwave sensing headphones (100) comprising a speaker (11). The headphones further comprise: sensing electrodes (14) divided into multiple groups and arranged outside the headphones, and used to acquire sensing electrical signals generated by brainwaves, wherein each of the groups at least comprises one of the sensing electrodes (14); a brainwave processing circuit (15) connected to each of the sensing electrodes, and used to preprocess the sensing electrical signals and then output sensing data; and a control circuit (17) connected to the brainwave processing circuit (15), and used to generate a control signal according to the sensing data provided by the brainwave processing circuit (15), decode audio data to obtain an audio signal, and synchronously output the audio signal and noise reduction signal to the speaker (11), wherein the control signal is used to trigger a terminal communicating with the headphones to configure the audio data outputted to the headphones. The headphones can be conveniently controlled by a user. The headphones may be smart headphones.

Description

Brainwave Induction Headphones

This application claims the priority of the Chinese patent application with the application number 202111484224.0 and the title of the invention "Brainwave Induction Earphone" filed at the China Patent Office on December 07, 2021, the entire contents of which are incorporated herein by reference.

technical field

The present application belongs to the technical field of earphones, and in particular relates to an earphone for brain wave induction.

Background technique

Currently, there are headsets on the market that support Bluetooth, noise reduction, heart rate and other functions. Most current Bluetooth headsets require users to manually operate the headset or the terminal communicating with the headset to set the corresponding scene mode or audio data, which is not convenient enough.

technical problem

The purpose of the present application is to provide a brain wave induction earphone, aiming at solving the problem that the current earphone needs manual operation to perform relevant operations, which is not convenient enough.

technical solution

The technical scheme that the embodiment of the present application adopts is:

An embodiment of the present application provides a brain wave induction earphone, including:

speaker;

A power supply circuit for supplying power to the earphone;

Communication circuit for transmitting charging signal, control signal and audio data;

A plurality of sets of sensing electrodes are arranged on the outside of the earphone, and are used to collect brain waves to generate induced electrical signals, wherein each set of sensing electrodes includes at least one sensing electrode;

An electroencephalogram processing circuit, connected to each of the sensing electrodes, for outputting sensing data after preprocessing the sensing electrical signals;

A noise reduction circuit, including at least one noise reduction microphone, the noise reduction circuit is used to collect environmental noise to generate a noise reduction signal;

a control circuit, connected to the brainwave processing circuit and the noise reduction circuit, for generating the control signal according to the sensing data provided by the brainwave processing circuit, and for decoding the audio data to obtain The audio signal is synchronously output to the speaker with the noise reduction signal;

Wherein, the control signal is used to trigger the terminal communicating with the earphone to set the audio data output to the earphone.

In one of the embodiments, the earphone is a headset, and a plurality of the sensing electrodes are respectively arranged on the inner surface of the headband and the inner surface of the ear pad of the headset, so as to be close to the user's head. department.

In one embodiment, two sets of sensing electrodes are arranged symmetrically on the inner surface of the headband, and at least one set of sensing electrodes are respectively set on the left and right earpads.

In one of the embodiments, the communication circuit includes a Bluetooth antenna and an audio interface for transmitting the control signal and the audio data.

In one of the embodiments, the communication circuit further includes a Type-C interface for transmitting one or more of charging signals, control signals and audio data.

In one of the embodiments, the brain wave processing circuit includes:

A plurality of filter circuits are respectively connected to a plurality of the sensing electrodes, and are respectively used to filter and amplify the induction electrical signals generated by the electroencephalogram collected by each of the sensing electrodes;

An analog-to-digital converter, connected to a plurality of said filter circuits, for performing analog-to-digital conversion on the amplified induced electrical signal to obtain induced data;

a controller, connected to the analog-to-digital converter and the control circuit, for converting the sensing data into a form suitable for a communication protocol with the control circuit, so as to transmit the sensing data to the Control circuit.

In one of the embodiments, the control circuit includes a Bluetooth audio chip.

In one of the embodiments, the control signal includes information indicating the user's mental state and concentration level, so that the terminal outputs matching audio data according to the information.

In one of the embodiments, the noise reduction circuit includes a noise reduction chip, the noise reduction chip is connected to the noise reduction microphone, and is used to generate a feed-forward noise reduction signal according to the environmental noise collected by the noise reduction microphone , feedback noise reduction signal or double-feed noise reduction signal.

In one embodiment, the earphone is a headset, and the noise reduction microphone is arranged on the outside of the ear shell and/or inside the ear shell of the headset.

Compared with the prior art, the embodiment of the present application has at least the following beneficial effects:

Brain wave sensing earphones generate control signals by collecting brain waves, and use the control signals to trigger the terminal that communicates with the earphones to set the audio data output to the earphones, so as to realize the function of setting the audio output without manual operation by the user, which is convenient to use . The user's emotional and mental state is monitored, and matching audio data can be provided according to the emotional and mental state to improve user experience.

Beneficial effect

The beneficial effect of the brain wave induction earphone provided by the embodiment of the present application is that: the brain wave induction earphone generates a control signal by collecting brain waves, and uses the control signal to trigger the terminal that communicates with the earphone to set the audio data output to the earphone, so as to realize different The function of setting the audio output requires manual operation by the user, which is convenient to use. The user's emotional and mental state is monitored, and matching audio data can be provided according to the emotional and mental state to improve user experience.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the embodiments or exemplary technical descriptions. Obviously, the accompanying drawings in the following descriptions are only for this application. For some embodiments, those skilled in the art can also obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of the brain wave induction earphone provided by the embodiment of the present application;

Fig. 2 is a circuit block diagram of the brain wave induction earphone provided by the embodiment of the present application;

Fig. 3 is a block diagram of the brain wave processing circuit in the circuit of the brain wave induction earphone shown in Fig. 2;

FIG. 4 is an example circuit diagram of a filter circuit of the electroencephalogram processing circuit shown in FIG. 3 .

Embodiments of the present invention

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

It is to be understood that the terms "length", "width", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, rather than indicating or implying the referred device Or elements must have a certain orientation, be constructed and operate in a certain orientation, and thus should not be construed as limiting the application.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present application, "plurality" means two or more, and "several" means one or more, unless otherwise specifically defined.

Please refer to Fig. 1 and Fig. 2, the embodiment of the present application provides a brainwave induction earphone 100, including a speaker 11, a power supply circuit 12, a communication circuit 13, multiple sets of induction electrodes 14, a brainwave processing circuit 15, and a noise reduction circuit 16 and the control circuit 17. In this application, a head-mounted smart headset is taken as an example.

There are two speakers 11 , which are respectively arranged in the two ear shells 101 and 102 ; the power supply circuit 12 is used to supply power to the earphone 100 as a whole. Generally, the power supply circuit 12 includes a battery 121, a charging chip 122, a voltage regulator circuit (LDO) or a buck-boost circuit (DC-DC). In this application, there are two batteries 121 to improve battery life, and the two batteries 121 They are respectively arranged in the two ear shells 101, 102, and are balanced by counterweights. The charging chip 122 is used for charging and discharging the battery 121 . The voltage stabilizing circuit or the voltage-boosting circuit is used to stabilize the voltage of the battery 121 or output voltage up/down.

The communication circuit 13 is used to transmit charging signals, control signals and audio data; in one embodiment, the communication circuit 13 includes a Bluetooth antenna 131 and an audio interface 132 for transmitting control signals and audio data, which can be connected by a 3.5mm audio cable The terminal can also be connected wirelessly through the Bluetooth antenna 131, which has certain convenience.

Optionally, the communication circuit 13 further includes a Type-C interface 133 for transmitting one or more of charging signals, control signals and audio data. During specific implementation, the Type-C interface 133 is generally used for charging, which has the advantage of fast charging.

Multiple groups of sensing electrodes 14 are arranged outside the earphone 100 for collecting brain waves to generate sensing electrical signals, wherein each group of sensing electrodes 14 includes at least one sensing electrode.

The electroencephalogram processing circuit 15 is connected with each group of sensing electrodes 14, and is used for preprocessing the sensing electric signal and outputting sensing data; the preprocessing includes filtering, amplification, analog-to-digital conversion, and protocol matching.

The noise reduction circuit 16 includes at least one noise reduction microphone 163. The noise reduction circuit 16 is used to collect environmental noise to generate a noise reduction signal, and can perform active noise reduction. When the earphone 100 is a headset, the noise reduction microphone 163 is arranged on the outside of the ear shell and/or the inside of the ear shell to realize the collection of environmental noise; optionally, the sound played by the loudspeaker 11 can also be collected to use To analyze the noise reduction effect, realize noise reduction feedback, and improve user experience.

The control circuit 17 is connected with the electroencephalogram processing circuit 15 and the noise reduction circuit 16, and is used to generate a control signal according to the induction data provided by the electroencephalogram processing circuit 15, and is used to decode the audio data to obtain an audio signal and the noise reduction signal to be outputted synchronously to the Speaker 11 ; wherein, the control signal is used to trigger a terminal (not shown) communicating with the earphone 100 to set the audio data output to the earphone 100 . It does not require manual settings by the user and is easy to use. The control circuit 17 is generally built with a Bluetooth audio chip, which constitutes the main control of the earphone 100 and also has functions such as Bluetooth communication, audio decoding, and system control. Synchronously outputting the audio signal and the noise reduction signal to the speaker 11 can cancel out the environmental noise and improve the user experience.

During specific implementation, the control signal includes information indicating the user's mental state and concentration level, so that the terminal outputs matching audio data according to the information. Realize the monitoring of emotion, mental state and concentration, and provide matching audio data according to emotional and mental state to improve user experience. Can judge whether you are emotionally normal and whether you are paying attention based on the control signals. When you are mentally anxious or unable to concentrate, it will tell you to pay attention to energy through the voice prompt in the earphone 100 . For example, once the user loses focus, the terminal will push a "jingle" sound similar to a bell to tell the user that he is distracted.

In one of the embodiments, a plurality of sensing electrodes are respectively arranged on the inner surface of the headband 110 and the inner surfaces of the ear pads 103, 104 of the headset, so as to be close to the user's head and improve the accuracy of brain wave signal collection. . Optionally, two sets of sensing electrodes 14 are arranged symmetrically on the inner surface of the headband 110 , and at least one set of sensing electrodes 14 are respectively set on the left and right ear pads 103 , 104 .

In other embodiments, such as earphones, the sensing electrodes can be directly arranged on the housing.

Please refer to FIG. 3 and FIG. 4 , in one embodiment, the brain wave processing circuit 15 includes a plurality of filter circuits 151 , an analog-to-digital converter 152 and a controller 153 .

A plurality of filter circuits 151 are respectively connected to the plurality of sensing electrodes, and the plurality of filter circuits 151 are respectively used for filtering and amplifying the induction electrical signals generated by the electroencephalogram collected by each sensing electrode.

Generally, the filter circuit 151 is constructed by using an operational amplifier, and may be implemented by using a discrete device or an integrated chip. The filter circuit 151 can be, for example, a differential amplifier circuit, or a voltage amplifier, a current amplifier, a transconductance amplifier, and a transimpedance amplifier.

In one embodiment, the filter circuit 151 includes an input protection circuit 1512 connected to the sensing electrode, a high-pass filter 1514 for filtering the DC component of the induced electrical signal, a notch filter 1516 for filtering power frequency interference, And a plurality of amplification circuits 1518 for amplification.

Wherein, the input protection circuit 1512 includes a current-limiting resistor R1, one end of the current-limiting resistor R1 is connected to the sensing electrode, and the other end is connected to the input of the high-pass filter 1514; the high-pass filter 1514 includes a filter capacitor connected in series with the current-limiting resistor R1 at one end C1, and a resistor R2 with one end connected to the other end of the filter capacitor C1 and the other end connected to ground.

Taking one of the amplifying circuits 1518 as an example, the amplifying circuit 1518 includes an operational amplifier U1A, a bias resistor R3 and a feedback resistor R4. The non-inverting input terminal of the operational amplifier U1A is connected to the other end of the filter capacitor C1, and the inverting input terminal is connected to the other terminal of the filter capacitor C1, and the inverting input terminal is passed through the bias resistor R4. R3 is grounded, and the feedback resistor R4 is connected between the inverting input terminal and the output of the operational amplifier U1A, and the output of the operational amplifier U1A is used as the output of the amplifying circuit 1518 .

Among them, the high-pass filter 1514 filters out the DC component of the induced electrical signal, and then connects it to an amplifying circuit 1518 for primary amplification, and then inputs it to the notch filter 1516 to filter out power frequency interference, and then passes through an amplifying circuit 1518 for secondary The secondary amplification is output to the analog-to-digital converter 152 , and the induced signal can be accurately identified by the analog-to-digital converter 152 by filtering out the DC component and power frequency interference and performing secondary amplification.

Optionally, the induced electrical signal output by secondary amplification may be output to the analog-to-digital converter 152 after several times of high/low-pass filtering, so that the analog-to-digital converter 152 can identify the induced electrical signal more accurately.

Optionally, the notch filter 1516 includes a CRCπ-type filter circuit and an RCR-type filter circuit, and the CRCπ-type filter circuit and the RCR-type filter circuit are connected in parallel between the output of the primary amplification circuit 1518 and the input of the secondary amplification circuit 1518, The CRCπ-type filter circuit includes two series-connected filter capacitors C3, C4 and a resistor R7 connected to the series connection node of the two filter capacitors C3, C4 and ground, and the RCR-type filter circuit includes two series-connected resistors R5, R6 and a filter capacitor C2 connected between the series connection node of the two resistors R5, R6 and ground. Two series-connected filter capacitors C3, C4 and two series-connected resistors R5, R6 are connected in parallel.

Optionally, the filter circuit 151 further includes a limiter circuit 1513 connected to the output side of the high-pass filter 1514 for limiting the amplitude of the induced electrical signal and a protection circuit 1515 for preventing interference (such as static electricity). The limiter circuit 1513 includes two diodes D1, D2, and the two diodes D1, D2 are connected in series between the positive and negative power supply +2V5, -2V5, and the other end of the filter capacitor C1 is connected to the series node of the two diodes D1, D2. To limit the amplitude of the induced electrical signal passing through the other end of the filter capacitor C1 within the positive and negative voltages (+2.5V, -2.5V) provided by the positive and negative power supply +2V5, -2V5. The protection circuit 1515 includes a protection capacitor C6, and the protection capacitor C6 is connected between the input of the primary amplifier circuit 1518 and the ground.

The controller 153 is connected with the analog-to-digital converter 152 and the control circuit 17 , and is used to convert the sensing data into a form of communication protocol with the control circuit 17 , so as to transmit the sensing data to the control circuit 17 . The controller 153 can use a common microprocessor, such as a single-chip microcomputer, to convert the sensing data into communication protocol data that the control circuit 17 can recognize, so as to improve transmission efficiency and reduce noise interference. The communication protocol can be, for example, Universal Asynchronous Transceiver (Universal Asynchronous Receiver/Transmitter, UART) form.

In one of the embodiments, the noise reduction circuit 16 includes a noise reduction chip 161, the noise reduction chip 161 is connected to the noise reduction microphone 163, and is used to generate a feed-forward noise reduction signal and a feedback noise reduction signal according to the environmental noise collected by the noise reduction microphone 163. Noise-reduced signal or dual-feed noise-reduced signal. Optionally, the earphone 100 is a headset, and the noise reduction microphone 163 is disposed outside the ear shell 101 and/or inside the ear shell 101 of the headset. For example, a noise reduction microphone 163 is provided on the outside of the left ear concha 101 and the inside of the ear concha 101 , and a noise reduction microphone 163 is respectively provided on the outside of the right ear concha 101 and the inside of the ear concha 101 . The ambient noise collected outside the ear shell 101 is used to generate a feed-forward noise reduction signal. The sound collected inside the ear shell 101 is used to generate a feedback noise reduction signal.

In one example, the brain wave sensing earphone 100 of the present application is a bluetooth earphone, supports active noise reduction function, and supports 3.5mm wired input. The bluetooth chip can be such as CSR8670, and the noise reduction chip 161 can be such as Sony CXD3775. In order to facilitate the upgrade of the software of the headset 100 to match the Apple mobile phone, an MFi (Made for iPhone/iPod/iPad) chip is added.

The brainwave sensing earphone 100 of the present application has added the function of brainwave detection. The brainwaves collect brainwave signals by contacting different parts of the head through 4 contacts. The brainwave signals are filtered and amplified by the operational amplifier, and then transmitted to the analog-to-digital converter 152 for analog-to-digital conversion. After data processing by the microprocessor Convert it to a differential signal and transmit it to the Bluetooth audio chip.

The Bluetooth audio chip passes through the simplified parallel process (Simplified Parallel Process, SPP) protocol to transmit brainwave data to mobile phones or laptops. The brain wave signal is further processed through the APP of the mobile phone or laptop computer to obtain the current state of the user, select appropriate music content to play to the user, improve the user's study and work attention, and improve the efficiency of study or work.

The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still implement the foregoing embodiments Modifications to the technical solutions described in the examples, or equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the application, and should be included in the Within the protection scope of this application.

Claims

A brain wave induction earphone, including a loudspeaker, is characterized in that it also includes;

A power supply circuit for supplying power to the earphone;

Communication circuit for transmitting charging signal, control signal and audio data;

A plurality of sets of sensing electrodes are arranged on the outside of the earphone, and are used to collect brain waves to generate induced electrical signals, wherein each set of sensing electrodes includes at least one sensing electrode;

An electroencephalogram processing circuit, connected to each of the sensing electrodes, for outputting sensing data after preprocessing the sensing electrical signals;

A noise reduction circuit, including at least one noise reduction microphone, the noise reduction circuit is used to collect environmental noise to generate a noise reduction signal;

a control circuit, connected to the brainwave processing circuit and the noise reduction circuit, for generating the control signal according to the sensing data provided by the brainwave processing circuit, and for decoding the audio data to obtain The audio signal is synchronously output to the speaker with the noise reduction signal;

Wherein, the control signal is used to trigger the terminal communicating with the earphone to set the audio data output to the earphone.
The brainwave induction earphone according to claim 1, wherein the earphone is a headphone, and a plurality of the induction electrodes are respectively arranged on the inner surface of the headband of the headphone and the inner surface of the ear pad. surface for close proximity to the user's head.
The brain wave induction earphone according to claim 2, characterized in that, the inner surface of the headband is provided with two groups of symmetrically arranged induction electrodes, and the left and right ear pads are respectively provided with at least one group of the induction electrodes. electrode.
The brainwave induction earphone according to claim 1, wherein the communication circuit includes a Bluetooth antenna and an audio interface for transmitting the control signal and the audio data.
The brainwave induction earphone according to claim 4, wherein the communication circuit further includes a Type-C interface for transmitting one or more of charging signals, control signals and audio data.
The brainwave induction earphone according to any one of claims 1 to 5, wherein the brainwave processing circuit comprises:

A plurality of filter circuits are respectively connected to a plurality of the sensing electrodes, and are respectively used to filter and amplify the induction electrical signals generated by the electroencephalogram collected by each of the sensing electrodes;

An analog-to-digital converter, connected to a plurality of said filter circuits, for performing analog-to-digital conversion on the amplified induced electrical signal to obtain induced data;

a controller, connected to the analog-to-digital converter and the control circuit, for converting the sensing data into a form suitable for a communication protocol with the control circuit, so as to transmit the sensing data to the Control circuit.
The brainwave induction earphone according to any one of claims 1 to 5, wherein the control circuit includes a Bluetooth audio chip.
The brain wave induction earphone according to any one of claims 1 to 5, wherein the control signal includes information indicating the user's mental state and concentration level, so that the terminal outputs a matching signal according to the information. audio data.
The brainwave induction earphone according to any one of claims 1 to 5, wherein the noise reduction circuit includes a noise reduction chip connected to the noise reduction microphone for The environmental noise collected by the noise microphone is used to generate a feed-forward noise reduction signal, a feedback noise reduction signal or a double-feed noise reduction signal.
The brainwave induction earphone according to claim 9, wherein the earphone is a headphone, and the noise reduction microphone is arranged outside and/or inside the ear shell of the headphone.