CN217470227U

CN217470227U - Brain wave induction earphone

Info

Publication number: CN217470227U
Application number: CN202123058693.4U
Authority: CN
Inventors: 彭信龙; 郭世文; 杨卉; 何桂晓; 曹磊; 吴海全
Original assignee: Shenzhen Feikedi System Development Co Ltd
Current assignee: Shenzhen Feikedi System Development Co Ltd
Priority date: 2021-12-07
Filing date: 2021-12-07
Publication date: 2022-09-20
Anticipated expiration: 2031-12-07

Abstract

The application relates to an electronic circuit, and provides a brain wave induction earphone, which comprises a loudspeaker and a power supply, wherein the loudspeaker is connected with the power supply; the multiple groups of induction electrodes are arranged outside the earphone and used for collecting brain waves to generate induction electric signals, wherein each group of induction electrodes at least comprises one induction electrode; the brain wave processing circuit is connected with each induction electrode and used for outputting induction data after preprocessing the induction electric signals; the control circuit is connected with the brain wave processing circuit and used for generating a control signal according to the induction data provided by the brain wave processing circuit and decoding the audio data to obtain an audio signal and synchronously outputting the audio signal and a noise reduction signal to a loudspeaker; wherein the control signal is used for triggering a terminal in communication with the headset to set the audio data output to the headset. The user can conveniently control the earphone.

Description

Brain wave induction earphone

Technical Field

The application belongs to the technical field of earphones, and particularly relates to a brain wave induction earphone.

Background

There is the earphone that supports the bluetooth at present on the market, falls to make an uproar, functions such as rhythm of the heart, and present bluetooth headset needs the user to carry out manual operation to earphone or with the terminal of earphone communication just can set for corresponding contextual model or audio data more, and is not convenient enough.

Disclosure of Invention

The application aims to provide a brain wave induction earphone, and aims to solve the problem that the existing earphone needs manual operation to carry out related operation and is not convenient enough.

The embodiment of the application provides a brain wave induction earphone, which comprises:

a speaker;

the power supply circuit is used for supplying power to the earphone;

the communication circuit is used for transmitting a charging signal, a control signal and audio data;

the multiple groups of induction electrodes are arranged outside the earphone and used for collecting brain waves to generate induction electric signals, wherein each group of induction electrodes at least comprises one induction electrode;

the brain wave processing circuit is connected with each induction electrode and used for outputting induction data after preprocessing the induction electric signals;

a noise reduction circuit comprising at least one noise reduction microphone, the noise reduction circuit to collect ambient noise to generate a noise reduction signal;

the control circuit is connected with the brain wave processing circuit and the noise reduction circuit, and is used for generating the control signal according to the induction data provided by the brain wave processing circuit and decoding the audio data to obtain an audio signal which is synchronously output to a loudspeaker together with the noise reduction signal;

wherein the control signal is used for triggering a terminal in communication with the headset to set the audio data output to the headset.

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

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

In one embodiment, the communication circuit includes a bluetooth antenna for transmitting the control signal and the audio data, and an audio interface.

In one embodiment, the communication circuit further comprises a Type-C interface for transmitting one or more of a charging signal, a control signal, and audio data.

In one embodiment, the brain wave processing circuit includes:

the plurality of filter circuits are respectively connected with the plurality of induction electrodes and are respectively used for filtering and amplifying induction electric signals generated by collecting brain waves by the induction electrodes;

the analog-to-digital converter is connected with the plurality of filter circuits and is used for performing analog-to-digital conversion on the amplified induced electrical signals to obtain induced data;

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

In one embodiment, the filter circuit includes, connected in sequence: the device comprises an input protection circuit connected to the induction electrode, a high-pass filter used for filtering a direct-current component of the induction electric signal, a primary amplification circuit used for amplifying, a notch filter used for filtering power frequency interference, and a primary amplification circuit used for secondary amplification.

In one embodiment, the control circuit comprises a bluetooth audio chip.

In one embodiment, the noise reduction circuit includes a noise reduction chip connected to the noise reduction microphone for generating a feed-forward noise reduction signal, a feedback noise reduction signal or a double-feed noise reduction signal according to the ambient noise collected by the noise reduction microphone.

In one embodiment, the headset is a headphone, and the noise reduction microphone is disposed outside and/or inside a shell of the headphone.

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

the brain wave induction earphone generates a control signal by collecting brain waves, and triggers a terminal which is communicated with the earphone to set audio data output to the earphone by using the control signal, so that the function of setting audio output without manual operation of a user is realized, and the use is convenient. The emotion and mental state of the user are monitored, and matched audio data can be provided according to the emotion and mental state to improve the user experience.

Drawings

Fig. 1 is a schematic structural diagram of a brain wave sensing earphone according to an embodiment of the present application;

fig. 2 is a circuit block diagram of a brain wave-sensing earphone according to an embodiment of the present application;

fig. 3 is a block diagram of a brain wave processing circuit in the circuit of the brain wave-sensing earphone shown in fig. 2;

fig. 4 is an exemplary circuit diagram of a filter circuit of the brain wave processing circuit shown in fig. 3.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can 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 be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings to facilitate the description of the application and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be constructed in operation as a limitation of the application.

Furthermore, the terms "first", "second" and "first" are used 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 defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more, and "a plurality" means one or more, unless explicitly defined otherwise.

Referring to fig. 1 and 2, a brain wave-sensing earphone 100 according to an embodiment of the present invention includes a speaker 11, a power supply circuit 12, a communication circuit 13, a plurality of sensing electrodes 14, a brain wave processing circuit 15, a noise reduction circuit 16, and a control circuit 17. In the present application, a headphone is taken as an example.

Two speakers 11 are respectively arranged in the two

ear shells

101 and 102; the power supply circuit 12 is used to supply power to the whole of the earphone 100. Generally, the power supply circuit 12 includes a battery 121, a charging chip 122, and a voltage regulator circuit (LDO) or a voltage step-up/step-down circuit (DC-DC), in this application, the battery 121 is two, so as to improve endurance, and the two batteries 121 are respectively disposed in the two

ear shells

101 and 102 and balanced by a counterweight. The charging chip 122 is used for charging and discharging the battery 121. The voltage stabilizing circuit or the voltage increasing and decreasing circuit is used for stabilizing or increasing/decreasing the voltage of the battery 121 for output.

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

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

A plurality of sets of sensing electrodes 14 are disposed outside the earphone 100 for collecting brain waves to generate sensing electrical signals, wherein each set of sensing electrodes 14 includes at least one sensing electrode.

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

The noise reduction circuit 16 includes at least one noise reduction microphone 163, and the noise reduction circuit 16 is configured to collect ambient noise to generate a noise reduction signal, enabling active noise cancellation. When the earphone 100 is a headphone, the noise reduction microphone 163 is disposed outside and/or inside the earshell of the headphone to collect ambient noise; optionally, the sound played by the speaker 11 may be collected to analyze the noise reduction effect, so as to implement noise reduction feedback and improve user experience.

The control circuit 17 is connected with the brain wave processing circuit 15 and the noise reduction circuit 16, and is used for generating a control signal according to the sensing data provided by the brain wave processing circuit 15, decoding the audio data to obtain an audio signal, and outputting the audio signal and the noise reduction signal to the loudspeaker 11 synchronously; the control signal is used to trigger a terminal (not shown) communicating with the headset 100 to set audio data output to the headset 100. The manual setting of a user is not needed, and the use is convenient. The control circuit 17 is generally built by a bluetooth audio chip to form a master control of the headset 100, and has functions of bluetooth communication, audio decoding, system control and the like. The audio signal and the noise reduction signal are synchronously output to the loudspeaker 11, so that the environmental noise can be offset, and the user experience is improved.

In particular implementations, the control signal includes information indicative of the user's mental state and degree of attention concentration, such that the terminal outputs the matched audio data according to the information. Monitoring of emotion, mental state and attention concentration degree is achieved, and matched audio data can be provided according to the emotion and mental state so as to improve user experience. Whether the emotion of a user is normal or not and whether the user is attentive or not can be judged according to the control signal. When you are anxious or inattentive, it tells you that attention should be paid through audible prompts in the headset 100. For example, once the user is inattentive, the terminal pushes a bell-like "jingle" sound to tell the user distracted.

In one embodiment, a plurality of sensing electrodes are respectively disposed on the inner side surface of the headband 110 of the headset and the inner surface of the

ear pads

103 and 104 for being close to the head of the user, so as to improve the acquisition accuracy of brain wave signals. Optionally, two sets of sensing electrodes 14 are symmetrically disposed on the inner surface of the headband 110, and at least one set of sensing electrodes 14 is disposed on each of the left and

right ear pads

103, 104.

In other embodiments, such as in-ear headphones, the sensing electrode may be disposed directly on the housing.

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

The 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 sensing electrical signals generated by the sensing electrodes collecting brain waves.

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 may be, for example, a differential amplifier circuit, or a voltage amplifier, a current amplifier, a transconductance amplifier, and a transimpedance amplifier.

In one embodiment, filter circuit 151 includes an input protection circuit 1512 coupled to the sense electrodes, a high pass filter 1514 for filtering the DC component of the sensed electrical signal, a notch filter 1516 for filtering power frequency interference, and a plurality of amplification circuits 1518 for amplification.

The input protection circuit 1512 includes a current-limiting resistor R1, where 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 C1 connected at one end in series with a current limiting resistor R1, and a resistor R2 connected at one end to the other end of the filter capacitor C1 and at the other end 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, a non-inverting input terminal of the operational amplifier U1A is connected to the other terminal of the filter capacitor C1, an inverting input terminal is grounded through the bias resistor R3, 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.

The induced signal is filtered by the high-pass filter 1514, the direct-current component of the induced signal is then connected to an amplifying circuit 1518 for primary amplification, then the induced signal is input to a notch filter 1516 for filtering power frequency interference, and then the induced signal is secondarily amplified by the amplifying circuit 1518 and 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 the direct-current component and the power frequency interference and carrying out secondary amplification.

Optionally, the induced electrical signal output by the second amplification may be further subjected to several high/low pass filtering before being output to the analog-to-digital converter 152, so that the analog-to-digital converter 152 can identify the induced electrical signal more accurately.

Alternatively, the notch filter 1516 includes a CRC pi type filter circuit and an RCR type filter circuit connected in parallel between the output of the primary amplification circuit 1518 and the input of the secondary amplification circuit 1518, wherein the CRC pi type filter circuit includes two filter capacitors C3, C4 connected in series and a resistor R7 connected between the series connection node of the two filter capacitors C3, C4 and ground, and the RCR type filter circuit includes two resistors R5, R6 connected in series 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 are connected in parallel with two series-connected resistors R5, R6.

Optionally, the filter circuit 151 further includes a limiter circuit 1513 for limiting the amplitude of the induced electric signal and a protection circuit 1515 for preventing disturbance (such as static electricity) connected to the output side of the high-pass filter 1514. The limiter circuit 1513 includes two diodes D1, D2, two diodes D1, D2 connected in series between the positive and negative power sources +2V5, -2V5, and a filter capacitor C1 connected at the other end to the series node of the two diodes D1, D2, for limiting the amplitude of the induced electrical signal passing through the other end of the filter capacitor C1 to be between the positive and negative voltages (+2.5V, -2.5V) provided by the positive and negative power sources +2V5, -2V 5. The protection circuit 1515 includes a protection capacitor C6, and the protection capacitor C6 is connected between the input of the primary amplification circuit 1518 and ground.

The controller 153 is connected to the analog-to-digital converter 152 and the control circuit 17, and is configured to convert the sensing data into a form suitable for a communication protocol with the control circuit 17 to transmit the sensing data to the control circuit 17. The controller 153 may be implemented by a common microprocessor, such as a single chip, for converting the sensing data into communication protocol data that can be recognized by the control circuit 17, so as to improve transmission efficiency and reduce noise interference. The communication protocol may be, for example, a Universal Asynchronous Receiver/Transmitter (UART) format.

In one embodiment, the noise reduction circuit 16 includes a noise reduction chip 161, and the noise reduction chip 161 is connected to the noise reduction microphone 163 for generating a feed-forward noise reduction signal, a feedback noise reduction signal or a double-feed noise reduction signal according to the ambient noise collected by the noise reduction microphone 163. Optionally, the headset 100 is a headset, and the noise reduction microphone 163 is arranged outside the earshell 101 and/or inside the earshell 101 of the headset. For example, one noise reduction microphone 163 is disposed outside the left-side ear shell 101 and inside the ear shell 101, respectively, and one noise reduction microphone 163 is disposed outside the right-side ear shell 101 and inside the ear shell 101, respectively. Ambient noise collected outside the eardrum 101 is used to generate a noise reduction signal of the feedforward type. Sound collected inside the eardrum 101 is used to generate a feedback noise reduction signal.

In one example, the brain wave-sensing headset 100 of the present application is a bluetooth headset, supports an active noise reduction function, and supports 3.5mm wired input. The bluetooth chip may employ, for example, CSR8670, and the noise reduction chip 161 may employ, for example, Sony CXD 3775. In order to conveniently match the software of the apple phone upgrading earphone 100, an MFi (Made for iPhone/iPod/iPad) chip is added.

The brain wave-sensing headset 100 of the present application increases the function of brain wave detection. The brain waves are contacted with different parts of the head through 4 contacts to acquire brain wave signals, the brain wave signals are subjected to filtering and signal amplification through operational amplifiers, the signals are transmitted to an analog-to-digital converter 152 to be subjected to analog-to-digital conversion, and a microprocessor converts the signals into differential signals after data processing and transmits the differential signals to a Bluetooth audio chip.

The Bluetooth audio chip transmits brain wave data to a mobile phone or a notebook computer through a Simplified Parallel Process (SPP) protocol. Brain wave signals are further processed through an APP of a mobile phone or a notebook computer, the current state of a user is obtained, appropriate music content is selected to be played to the user, the learning and working attention of the user is improved, and the learning or working efficiency is improved.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. A brain wave induction earphone comprises a loudspeaker and is characterized by also comprising a power supply, a power supply and a power supply circuit;

the power supply circuit is used for supplying power to the earphone;

2. The brain wave-sensing headset according to claim 1, wherein the headset is a headset, and the plurality of sensing electrodes are respectively disposed on an inner side surface of a headband of the headset and an inner surface of an ear pad for being proximate to a head of a user.

3. The brain wave-sensing headset according to claim 2, wherein two sets of the sensing electrodes are symmetrically disposed on an inner surface of the headband, and at least one set of the sensing electrodes is disposed on each of the left and right ear pads.

4. The brain wave-sensing headset of claim 1, wherein the communication circuit includes a bluetooth antenna for transmitting the control signal and the audio data and an audio interface.

5. The brain wave-sensing headset of claim 4, wherein the communication circuit further comprises a Type-C interface for transmitting one or more of a charging signal, a control signal, and audio data.

6. The brain wave-sensing headset according to any one of claims 1 to 5, wherein the brain wave processing circuit includes:

7. The brain wave-sensing headset of claim 6, wherein the filtering circuit comprises, connected in sequence: the device comprises an input protection circuit connected to the induction electrode, a high-pass filter used for filtering a direct-current component of the induction electric signal, a primary amplification circuit used for amplifying, a notch filter used for filtering power frequency interference, and a primary amplification circuit used for secondary amplification.

8. The brain wave-sensing headset of any one of claims 1 to 5, wherein the control circuit includes a Bluetooth audio chip.

9. The brain wave sensing headset of any one of claims 1 to 5, wherein the noise reduction circuit includes a noise reduction chip connected to the noise reduction microphone for generating a feed-forward noise reduction signal, a feedback noise reduction signal or a double-feed noise reduction signal according to the ambient noise pair collected by the noise reduction microphone.

10. The brain wave sensing headset of claim 9, wherein the headset is a headset and the noise reducing microphone is disposed outside and/or inside a concha of the headset.