WO2020014853A1

WO2020014853A1 - Earphone, and earphone in-ear detection method and system

Info

Publication number: WO2020014853A1
Application number: PCT/CN2018/095879
Authority: WO
Inventors: 邱士嘉; 谢冠宏; 高铭坤
Original assignee: 万魔声学科技有限公司
Priority date: 2018-07-17
Filing date: 2018-07-17
Publication date: 2020-01-23
Also published as: CN109076279A

Abstract

Provided is an earphone in-ear detection method. The method comprises: an earphone playing a detection sound wave, wherein the detection sound wave has a first acoustic parameter; collecting a reflected wave of the detection sound wave, wherein the reflected wave has a second acoustic parameter; and determining, based on the first acoustic parameter and the second acoustic parameter, whether the earphone is in an ear.

Description

Earphone, earphone detection method and system

Technical field

The present invention relates to the technical field of sound playback equipment, and in particular, to a headset, a method and a system for detecting the in-ear of a headset.

Background technique

With the development trend of miniaturization of earphones and the increase in the demand for interaction, more and more earphones have the function of in-ear detection.

The earphones currently on the market are generally equipped with a sensing device such as an infrared sensor or a laser sensor, and perform in-ear detection based on the sensing distance. For example, by using a sensing device to transmit a detected electromagnetic signal to the ear canal, and collect a reflected signal from the ear canal, and then determine the current based on the special difference characteristics between the detected electromagnetic signal and the reflected signal, such as time difference or information carrier difference. The distance between the earphone and the human ear, and when the distance is less than a predetermined distance value, it is set that the earphone has been inserted into the ear canal, thereby achieving ear detection.

However, due to the complicated internal structure of the ear, the accuracy of the in-ear detection based on the electromagnetic signal-based distance sensing device is not high, and it is very easy to cause misjudgment if there is a foreign body obstruction in the sensing direction of the headphone sensing device.

Summary of the invention

According to various embodiments of the present application, an earphone, a method and a system for earphone detection are provided.

A method for detecting earphone in-ear, the method includes:

The earphone plays a detection sound wave; the detection sound wave has a first acoustic parameter;

Collecting a reflected wave of the detection acoustic wave; the reflected wave has a second acoustic parameter; and

Based on the first acoustic parameter and the second acoustic parameter, determine whether the earphone has been inserted into the ear.

Details of one or more embodiments of the invention are set forth in the accompanying drawings and description below. Other features, objects, and advantages of the invention will be apparent from the description, the drawings, and the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the technical solutions in the embodiments of the present application or the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely These are some embodiments of the present application. For those of ordinary skill in the art, without any creative effort, drawings of other embodiments can be obtained according to these drawings.

FIG. 1 is a schematic flowchart of an earphone detection method for an earphone according to an embodiment; FIG.

FIG. 2 is a schematic flowchart of a method for detecting in-ear earphones according to another embodiment; FIG.

3 is a schematic diagram of a frequency band and an amplitude of a sound wave detected before earphone detection in an embodiment;

FIG. 4 is a schematic diagram of detecting a frequency band of a sound wave and a magnitude of a reflected wave after earphone detection in an embodiment; FIG.

5 is a schematic structural diagram of an earphone according to an embodiment;

6 is a schematic structural diagram of an earphone inserted into an ear canal in an embodiment;

FIG. 7 is a schematic structural diagram of a headset in-ear detection system according to an embodiment.

detailed description

In order to facilitate understanding of the present application, the present application will be described more fully with reference to the related drawings. The drawings show a preferred embodiment of the present application. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and comprehensive understanding of the disclosure of this application.

FIG. 1 is a schematic flowchart of an earphone detection method for an earphone according to an embodiment. As shown in FIG. 1, in an optional embodiment, a method for detecting in-ear earphones may include:

In step S12, the detection sound wave is played.

Specifically, by using a headset to play a detection sound wave, the detection sound wave may have a first acoustic parameter, and the first acoustic parameter may include a frequency band, an amplitude, and the like.

In step S14, reflected waves of the detected acoustic waves are collected.

Specifically, sound waves may also be collected by using the foregoing earphones. For example, the sound waves such as the reflected waves of the detected sound waves and environmental noise may be collected by using the headphones. The reflected wave described above has a second acoustic parameter, and the second acoustic parameter may also include a frequency band and an amplitude.

In step S16, it is determined whether the earphone has been inserted into the ear based on the acoustic parameters of the detected acoustic wave and reflected wave.

Specifically, in-ear detection may be performed on the earphone based on the first acoustic parameter and the second acoustic parameter. For example, based on the first acoustic parameter and the second acoustic parameter, it can be determined whether the reflected wave is a resonance wave for detecting the acoustic wave. If the resonance wave of the acoustic wave is detected, it can be determined that the earphone has been inserted into the ear at this time.

The method for detecting the in-ear of the earphone in the above embodiment is based on the acoustic parameters of the sound wave. The in-ear detection of the earphone is based on the acoustic parameters of the sound wave. Since the sound wave has better propagation characteristics inside the ear with a complex structure than the electromagnetic wave signal, the accuracy of the in-ear detection can be effectively improved. , To reduce the false detection rate caused by the detection of foreign matter blocking detection wave transmission.

In an optional embodiment, the above-mentioned first acoustic parameter may include a preset frequency band, and the preset frequency band may be a seal formed by inserting the above-mentioned headphones (such as in-ear headphones or over-ear headphones) into different human ears. Resonant frequency band of the chamber. In the method for detecting the in-ear of the earphone, the above-mentioned preset frequency band may be obtained based on big data analysis, so as to further improve the accuracy of the detection of the in-ear of the earphone.

In an optional embodiment, the above-mentioned first acoustic parameter may further include a first amplitude, and the amplitude of the detected sound wave is constant to the first amplitude within the preset frequency range; meanwhile, the above-mentioned second acoustics The parameter may include a second amplitude. In the method for detecting in-ear earphones, whether the reflected wave is a resonance wave for detecting a sound wave may be determined by determining whether the second amplitude is greater than the first amplitude. For example, the above-mentioned detection sound wave may be played in a frequency-sweeping manner, and the reflection wave of the detection sound wave may be collected in real time. If the second amplitude of the reflection wave is greater than the first amplitude of the detection sound wave, the collected reflection wave may be considered For the above detection of the acoustic resonance wave, that is, the earphone and the inner cavity of the human ear have formed a relatively sealed cavity at this time, which means that the earphone has been inserted into the ear, and thus the above-mentioned earphone detection operation can be stopped, and the earphone can be continued after the earphone is inserted into the ear. Other operations; on the other hand, it means that the earphone is not in the ear, then the above-mentioned detection sound wave can continue to be played in a loop, and the reflection wave collection and judgment are continued in real time until it is determined that the earphone has been in the ear.

In another optional embodiment, in order to further improve the accuracy of the in-ear detection of the earphones, in the above-mentioned earphone detection method, a reference amplitude threshold may be preset, and the reference amplitude threshold may be greater than or equal to the above-mentioned first The reference amplitude threshold may be set through a large data summary analysis process based on the characteristics of the resonance waves of the cavity formed inside the human ear, and the reference amplitude threshold is greater than the aforementioned first amplitude. For example, you can determine whether the second amplitude of the collected reflected wave is greater than the reference amplitude threshold. If the second amplitude is greater than the reference amplitude threshold, it means that the reflected wave is a resonance wave in the sealed cavity formed by the acoustic wave inside the human ear. , You can confirm that the headset is in the ear.

In another optional embodiment, in order to make the in-ear detection of the earphones more accurate, the maximum amplitude value of the reflected wave collected in the preset frequency band may be used as the above-mentioned second amplitude, and based on the second amplitude The above-mentioned determination of the resonance wave is performed. For example, as shown in FIG. 4, after performing a frequency sweep output operation from frequency F1 to frequency F3, the maximum amplitude value of the amplitude of the reflected wave collected by the scan output operation is extracted as the above-mentioned second amplitude value, such as The amplitude value A2 corresponding to the frequency F2 shown in FIG. 4 is used as the second amplitude value; then, the second amplitude is compared with the above-mentioned reference amplitude threshold value to determine whether the earphone is in the ear during the scanning operation. That is, in this embodiment, the frequency sweep output operation can be performed every interval, and the maximum amplitude value of the reflected wave collected by the frequency sweep output is used as the second amplitude to perform in-ear detection, which can not only save the power consumption of in-ear detection, but also Can effectively improve the accuracy of in-ear detection. In addition, while sweeping the output to collect reflected waves, the amplitude of the reflected waves collected in real time may be used as the second amplitude for real-time judgment. Once it is determined that the amplitude of the currently collected reflected waves is greater than the above-mentioned reference amplitude threshold, then Make sure that the current headset has been inserted into the ear. At the same time, you can stop related operations such as reflection wave collection and in-ear detection to continue to perform related operations after the headset is inserted into the ear.

In an optional embodiment, the above-mentioned earphone may include a speaker for playing sound and a microphone for noise reduction. In the above-mentioned in-ear detection method, the above-mentioned speaker may be used to detect sound wave playback, and at the same time, the above-mentioned microphone is used. Collect reflected waves. Traditional earphones are generally equipped with optical sensing devices such as infrared sensors and laser sensors to achieve earphone detection. This will increase the volume of the earphones and deviate from the trend of miniaturization of the earphones. In addition, a window for setting the sensing device needs to be correspondingly opened on the shell of the earphone, which will increase the difficulty and cost of earphone production and debugging. In this implementation, the earphone detection function of the above-mentioned earphones is implemented by sharing the speakers and microphones already set in the earphones, without adding other components, and without changing the structure and production process of the earphones, the earphones can be inserted into the earphones. The accurate detection can reduce the difficulty and cost of earphone production and debugging while adapting to the trend of miniaturization of earphones.

FIG. 2 is a schematic flowchart of a method for detecting in-ear earphones in another embodiment. FIG. 3 is a schematic diagram for detecting a frequency band and amplitude of a sound wave before in-ear detection of earphones in one embodiment. FIG. 4 is a diagram for detecting the sound wave after in-ear detection of earphones in one embodiment. Schematic diagram of frequency band and reflected wave amplitude. Among them, the abscissa in FIGS. 3 to 4 represents the acoustic wave frequency F, the ordinate represents the amplitude A of the acoustic wave, and the line segment L1 in the figure is the frequency-amplitude function of the detected acoustic wave, and the line segment L2 is the frequency of the reflected wave received by the microphone − Amplitude function. The line segment L3 is a frequency-amplitude function between a reference amplitude threshold used as a reference and a preset frequency band.

It should be noted that, in the embodiment of the present application, when the in-ear detection is directly performed using the sound wave amplitude, the unit of the sound wave amplitude may be decibel (db), and when the in-ear detection is performed based on the circuit structure, the unit of the sound wave amplitude may correspond to Convert to a voltage signal (such as mV) for in-ear detection, that is, in actual applications, the sound wave amplitude and other parameters can be converted accordingly according to the actual situation, so as to facilitate the in-ear detection operation, but the embodiment of this application does not detect the sound wave amplitude. The unit is specifically limited.

As shown in Figs. 2 to 4, in combination with practical applications, in an optional embodiment, based on the principle of ear canal resonance, it can accurately detect whether the current earphone has been inserted into the ear without additional earphone components. In the road, the earphone detection is performed; the method for implementing the earphone detection may include the following steps:

Step S22: Set a reference amplitude threshold, and detect a preset frequency band and a first amplitude of the sound wave.

Specifically, a detection sound wave used for in-ear detection can be set according to actual needs and combined with big data analysis; the detection sound wave L1 has acoustic parameters such as a preset frequency band suitable for different human ear structures and a first amplitude A1.

When the earphone is inserted into any ear, the sealed cavity formed by it will resonate with a certain frequency sound wave, so the earphone can be detected by the resonance wave. In addition, the sealed cavity formed by inserting the earphone into different ear canals has Certain differences, so the preset frequency band F for detecting the acoustic wave L1 can be set from frequency F1 to frequency F3, and the frequency F2 of the resonance wave in the sealed cavity formed above is located between the frequency F1 and the frequency F3, and The amplitude of the detection sound wave L1 between the above-mentioned frequency F1 and frequency F3 is constant to be the first amplitude A1; and for more accurate earphone detection, a reference amplitude threshold value A3 can be set based on data analysis, that is, the above-mentioned Within the range of frequency F1 and frequency F3, as long as the second amplitude A of the collected reflected wave L2 is greater than the above-mentioned reference amplitude threshold A3, the current earphone can be deemed to have been inserted into the ear; where F1≤F2≤F3, A1≤A3, and To ensure that the ear detection does not cause damage to the human ear, it is necessary to ensure that the sound waves with the above-mentioned acoustic parameters A1, A, F1, F2, and F3 are within the range that the human ear can normally withstand.

In step S24, the sound waves of the headphones are cyclically played and detected in a frequency sweeping manner.

Specifically, the above-mentioned earphone is used as a speaker for playing sound, and the frequency is continuously scanned from the frequency F1 to the frequency F2 shown in FIG. 3 to output the detection sound wave, and the amplitude of the output detection sound wave L1 is constant to the first amplitude A1.

In step S26, the reflected wave is collected in real time by the microphone of the headset, and then the current second amplitude of the reflected wave is obtained.

Specifically, while the speaker of the earphone plays the detected sound wave in a loop, a microphone (MIC) of the earphone may be used to synchronously collect the reflected wave of the detected sound wave, and then obtain the amplitude of the reflected wave as the second amplitude.

In step S28, it is determined whether the second amplitude obtained in step S26 is greater than the reference amplitude threshold set in step S22; if the second amplitude is greater than the reference amplitude threshold, proceed to step S30; and the second amplitude is less than or equal to the reference amplitude If the threshold value is reached, step S24 is continued.

Specifically, referring to Figs. 3 to 4, when it is detected that the second amplitude A of the current reflected wave L2 is smaller than the above-mentioned reference amplitude threshold A3, it means that a sealed cavity is not formed between the current headset and the ear canal. That is, the earphone is not inserted into the ear canal, and the speaker of the earphone can continue to play the above-mentioned detection sound wave in a frequency sweeping manner. Once it is detected that the second amplitude A of the collected reflected wave is greater than the reference amplitude threshold, as shown in FIG. 4, the second amplitude A of the reflected wave L2 at the frequency F2 is A2, that is, it can be determined at this time that the microphone has collected the The reflected wave is a resonance wave, that is, the earphone has been inserted into the ear canal and forms a sealed cavity with the ear canal, and accordingly it can be determined that the current earphone has been inserted into the ear.

Step S30: The speaker of the earphone stops playing and detecting the sound wave.

Specifically, after detecting that the earphone has been inserted into the ear in the above step S28, the earphone can be stopped to detect the playback of sound waves, and normal sound playback or other corresponding operations can be performed, and the noise reduction headset is also restored to the normal use state. Among them, while the above-mentioned speaker detects the sound wave playback, and the noise reduction headset collects reflected waves, it can simultaneously perform normal sound playback and noise reduction operation, that is, the above-mentioned earphone detection does not affect the normality of the earphone speaker and the noise reduction headset. The work has an impact and can happen simultaneously.

In the embodiment of the method for detecting the in-ear of the earphone, a frequency-sweeping loop is used to play a detection sound wave of a fixed amplitude through the speaker, thereby triggering the resonance of the sealed cavity formed by the earphone being inserted into the ear canal, so that the earphone can be detected by collecting the amplitude of the reflected wave. The in-ear detection operation not only has high accuracy, but also does not increase the volume of the headset and the production and manufacturing costs, which is conducive to the miniaturization of the headset.

FIG. 5 is a schematic structural diagram of an earphone in an embodiment. As shown in FIG. 5, in an optional embodiment, a headset 10 may include a speaker 12 and a microphone 14. The speaker 12 may be used to play sounds, and the microphone 14 may be used to collect ambient sounds for noise reduction. The speaker 12 can also be used to play detection sound waves, and the microphone can also be used to collect the reflection waves of the detection sound waves, and the in-ear detection operation of the earphone 10 can be performed based on the detection sound waves and the collected reflection waves. For example, the in-ear detection operation of the earphone 10 is performed by judging whether the reflected wave collected by the microphone 14 is a resonance wave of the detection sound wave played by the speaker 12; that is, if the reflected wave is a resonance wave of the detection sound wave, the description is The earphone 10 is currently inserted into the ear canal.

FIG. 6 is a schematic structural diagram of an earphone inserted into an ear canal in an embodiment. In an optional embodiment, as shown in FIG. 6, the earphone 10 is an in-ear earphone. After the earphone 10 is inserted into the ear canal 16, the earphone 10 and the ear canal 16 form a sealed cavity, and then can be performed by acoustic resonance. In-ear detection, such as the above-mentioned speaker 12 can use the frequency sweeping method to cycle the detection sound wave of a preset frequency band, and the amplitude of the detection sound wave is constant, and then the reflection can be judged by the amplitude of the reflected wave collected by the microphone 14 Whether the wave is a resonance wave, that is, based on the process steps in any one of the embodiments of the method for detecting the in-ear of the earphone based on the earphones shown in FIGS. 5 to 6, and then accurately implement the in-ear detection operation of the earphone.

FIG. 7 is a schematic structural diagram of a headset in-ear detection system according to an embodiment. As shown in FIG. 7, in an optional embodiment, the earphone detection system 20 may include an earphone 24 and a processor 22. The processor 22 may be integrated in the earphone 22 and also integrated in a terminal device connected to the earphone 22. in. The above-mentioned earphone 24 may include a speaker 242 and a microphone 244. The speaker 242 may be used to play sound. The microphone 244 may be used to collect environmental noise. At the same time, the above-mentioned speaker 242 may be used to play detection sound waves, and the microphone 244 may also be used to collect the detection. A reflected wave of sound waves; the processor 22 may be connected to the above-mentioned horn 242 and the microphone 244, respectively, and the processor 22 may be used to determine whether the reflected wave collected by the microphone 244 is a resonance wave of the detected sound wave played by the above-mentioned horn 242, thereby determining the current Whether the earphone 24 is already in the ear.

In an optional embodiment, the earphone 24 shown in FIG. 7 may be the earphone 10 shown in FIGS. 5 to 6, and at the same time, the process steps in any one of the above methods for earphone detection may be performed. Then, the in-ear detection operation of the headphones is accurately realized.

The technical features of the embodiments described above can be arbitrarily combined. In order to simplify the description, all possible combinations of the technical features in the above embodiments have not been described. However, as long as there is no contradiction in the combination of these technical features, It should be considered as the scope described in this specification.

The above-mentioned embodiments only express several implementation manners of the present invention, and their descriptions are more specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be noted that, for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent shall be subject to the appended claims.

Claims

A method for detecting earphone in-ear, the method includes:

The earphone plays a detection sound wave; the detection sound wave has a first acoustic parameter;

Collecting a reflected wave of the detection acoustic wave; the reflected wave has a second acoustic parameter; and

Based on the first acoustic parameter and the second acoustic parameter, determine whether the earphone has been inserted into the ear.
The method according to claim 1, wherein determining whether the earphone has been inserted into the ear based on the first acoustic parameter and the second acoustic parameter comprises:

Determining whether the reflected wave is a resonance wave of the detected acoustic wave based on the first acoustic parameter and the second acoustic parameter;

Wherein, if the reflected wave is a resonance wave of the detection sound wave, it is determined that the earphone has been inserted into the ear.
The method according to claim 2, wherein the first acoustic parameter includes a preset frequency band, and the method further comprises:

Obtaining the preset frequency band based on big data analysis;

Wherein, the preset frequency band is a resonance frequency band formed by the earphone being inserted into a sealed cavity formed by different human ears.
The method according to claim 3, wherein the first acoustic parameter further includes a first amplitude, and the amplitude of the detected sound wave is constant to the first amplitude within the preset frequency band range; The second acoustic parameter includes a second amplitude, and the second amplitude is an amplitude value of the collected reflected wave; the method further includes:

A preset reference amplitude threshold; the reference amplitude threshold is greater than or equal to the first amplitude;

Wherein, determining whether the reflected wave is a resonance wave of the detection acoustic wave based on the first acoustic parameter and the second acoustic parameter includes:

Determining whether the second amplitude is greater than the reference amplitude threshold;

If the second amplitude is greater than the reference amplitude threshold, determining that the reflected wave is a resonance wave of the detected acoustic wave; and

When the reflected wave is a resonance wave of the detected acoustic wave, the second amplitude is a maximum amplitude value of the reflected wave.
The method according to claim 3, wherein the detection sound wave is cyclically played in a frequency sweeping manner;

When it is determined that the earphone has been inserted into the ear, the detection sound wave is stopped from being played.
The method according to any one of claims 1 to 5, wherein the earphone includes a speaker and a microphone, and is characterized in that:

Playing the detection sound wave using the speaker; and

The reflected wave of the detection sound wave is collected using the microphone.
The method according to any one of claims 1 to 5, wherein the earphone is an in-ear earphone.
A headset including:

Speakers for playing sounds; and

Microphone for capturing ambient sound;

Wherein, the speaker is further used for playing detection sound waves, and the microphone is further used for collecting reflected waves of the detection sound waves; and

The detection sound wave and the reflected wave are used to detect whether the earphone is in the ear.
The headset according to claim 8, wherein the headset is an in-ear headset.
An earphone detection system includes:

An earphone including a speaker and a microphone; the speaker is used to play a detection sound wave, and the noise reduction headset is used to collect a reflected wave of the detection sound wave; and

A processor, which is respectively connected to the speaker and the microphone;

The processor is configured to determine whether the earphone has entered the ear according to whether the reflected wave is a resonance wave of the detection sound wave.