WO2021179280A1

WO2021179280A1 - Earphone and method for detecting wearing state thereof

Info

Publication number: WO2021179280A1
Application number: PCT/CN2020/079157
Authority: WO
Inventors: 孙舒远; 黄兴志; 张欣; 黄翔
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2020-03-11
Filing date: 2020-03-13
Publication date: 2021-09-16
Also published as: CN111356053A

Abstract

Provided by the present invention are an earphone and a method for detecting a wearing state thereof. The method for detecting the wearing state of an earphone of the present invention comprises: transmitting a detection ultrasonic wave, the detection ultrasonic wave having a stable first intensity parameter; collecting a reflected wave of the detection ultrasonic wave, the reflected wave comprising a second intensity parameter and embodying a distance parameter between the earphone and a user; and on the basis of the second intensity parameter and the distance parameter, determining whether the earphone is already in an ear. In the method for detecting the wearing state of the earphone of the present invention, an ultrasonic wave is transmitted by means of sharing a sound generating device of the earphone, and a signal is received and analyzed by a receiving device, so that it may be determined whether the earphone is in the ear, and the accurate detection of whether the earphone is in the ear may be achieved without adding other components and without changing the structure and production process of the earphone, thus facilitating the miniaturization and low cost of the earphone.

Description

Earphone and its wearing state detection method

Technical field

The invention relates to the field of smart wearable equipment, and in particular to a headset and a wearing state detection method.

Background technique

Earphones are currently one of the more mainstream consumer electronic products. With the widespread use of smart wearable devices, smart earphones are playing an increasingly important role in portable interaction, especially TWS true wireless stereo earphones. The focus of market attention in recent years.

At present, most TWS headsets or smart headsets are equipped with in-ear detection function, that is, when it is detected that the headset device is put in the user's ear, the headset device starts to play or work automatically, and when it is detected that the headset device is taken out of the ear by the user, the headset The device starts to automatically stop playing or stop working. To realize this function, the current product adopts an infrared detection method, which is equipped with an infrared sensor in the front cavity of the earphone core to detect the distance between the earphone device and the human ear. This way of implementation, on the one hand, changes the acoustic performance of the front cavity of the earphone core, which easily affects the sound quality of the earphone device; on the other hand, it adds a component to the small size of the earphone, which increases the weight and size of the whole machine. Increasing the complexity of the design of the whole machine, but also increasing the cost of the overall product.

technical problem

The purpose of the present invention is to provide a headset and a wearing state detection method thereof that saves the space and cost of the headset.

Technical solutions

The technical scheme of the present invention is as follows:

A method for detecting the wearing state of earphones, including:

Transmitting a detection ultrasonic wave, the detection ultrasonic wave having a stable first intensity parameter;

Collecting the reflected wave of the detected ultrasonic wave, the reflected wave including a second intensity parameter and a distance parameter reflecting the distance between the earphone and the user; and

Based on the second intensity parameter and the distance parameter, it is determined whether the earphone has been in the ear.

Preferably, before the collecting the reflected wave of the detection ultrasonic wave, the method includes:

Acquiring the relationship curve between the second intensity parameter and the distance parameter;

The peak value of the intensity parameter placed on the relationship curve is the third intensity parameter.

Preferably, the collecting the reflected wave of the detected ultrasonic wave includes:

Monitoring the second intensity parameter of the transmitted wave;

When the second intensity parameter is equal to the third intensity parameter, start to record the second intensity parameter and the distance parameter to obtain recorded data.

Preferably, the judging whether the earphone has been in the ear based on the second intensity parameter and the distance parameter includes:

According to the relationship between the recorded data and the relationship curve, it is determined whether the earphone has been put into the ear.

Preferably, the relationship curve includes a first region where the second intensity parameter gradually becomes larger when the distance parameter gradually increases, and a first region where the second intensity parameter gradually becomes smaller when the distance parameter gradually increases. Two areas; judging whether the earphone has been put into the ear according to the relationship between the recorded data and the relationship curve, including:

When the second intensity parameter is zero, stop recording;

Analyzing whether the recorded data covers the first area or the second area;

It is determined whether the earphone is already in the ear.

Preferably, the determining whether the earphone is already in the ear includes:

When the recorded data covers the first area;

Then, it is determined that the earphone is completely in the ear.

When the recorded data covers the second area;

Then, it is determined that the earphone has been completely taken out.

The invention also discloses a headset, including:

Acoustic device for emitting and detecting ultrasonic waves; and

A receiving device for collecting the reflected wave of the detected ultrasonic wave;

Wherein, the detection ultrasonic wave and the reflected wave are used to detect whether the earphone is in the ear by the above-mentioned method for detecting the wearing state of the earphone.

Preferably, the sound emitting device is an earphone core, and the receiving device is a microphone.

Preferably, the sound emitting device satisfies a 2kHz bandwidth in the range of 20k-23kHz at a sampling rate of 48k, and a 4kHz bandwidth in the range of 20k-46kHz at a sampling rate of 96k.

Preferably, the receiving device satisfies a 2kHz bandwidth in the range of 20k-23kHz at a sampling rate of 48k, and a 4kHz bandwidth in the range of 20k-46kHz at a sampling rate of 96k.

Beneficial effect

The beneficial effect of the present invention is that: the earphone wearing state detection method of the present invention transmits ultrasonic waves by sharing the sound emitting device of the earphone, and the receiving device receives and analyzes the signal, so that it can be judged whether the earphone is in the ear without adding other components, and there is no need to add other components to the earphone. The structure and production process of the headset can be modified to achieve accurate detection of whether the headset is in the ear, which is conducive to the miniaturization and low cost of the headset. The earphone of the present invention makes full use of its own sound generating device and receiving device, does not need to add infrared sensors or other components, reduces the weight of the whole machine, simplifies the design, and reduces the cost.

Description of the drawings

FIG. 1 is a schematic flowchart of a method for detecting a wearing state of a headset according to the present invention;

2 is a schematic diagram of the structure of the earphone of the present invention;

3 is a schematic diagram of ultrasonic transmission and reception in the method for detecting the wearing state of the earphone of the present invention;

4 is a graph of the relationship between the second intensity parameter and the distance parameter of the present invention;

Figure 5 is a graph of the relationship between the first area of the present invention;

Fig. 6 is a graph of the relationship between the second area of the present invention.

Embodiments of the present invention

The present invention will be further described below in conjunction with the drawings and embodiments.

As shown in Figure 2-3, the present invention discloses a headset, specifically a smart headset that does not include an infrared sensor. Among them, the sound emitting device is located in the front cavity formed by the earphone front cover 10 and the earphone bottom cover 30. The earphone front cover 10 is provided with a secondary sound hole 20 that is convenient for the sound emitting device to emit sound. The receiving device is located on the earphone bottom cover 30. The bottom cover 30 is provided with a receiving device hole 40 for the receiving device to receive ultrasonic waves. The sound generating device generates an ultrasonic band signal with a certain bandwidth and intensity, and propagates to the outside of the earphone through the secondary sound hole 20. The ultrasonic band signal propagates to the user's head through the transmission path 50 (the path in the dashed line), and passes through the reflection path 60 ( The dashed part of the path) propagates back to the earphone, and the receiving device receives the reflected signal through the receiving device hole 40.

When the earphone is completely worn into the human ear, the front cover 10 of the earphone and the ear canal form a closed space. At this time, the receiving device is outside the closed space and cannot receive reflected ultrasonic waves. The position setting method of the sound emitting device and the receiving device of the present invention can optimize the front cavity acoustic performance of the earphone on the one hand, and on the other hand can reduce the number of components of the whole machine, reduce the weight of the whole machine, simplify the design complexity, and reduce the cost.

The sound generating device is used to transmit the detection ultrasonic wave; and the receiving device is used to collect the reflected wave of the detection ultrasonic wave; the detection ultrasonic wave and the reflected wave are used to check whether the earphone is worn by the following earphone wearing state detection method In-ear detection. The sound generating device may be, but not limited to, a moving coil type, a moving iron type, a hybrid earphone core, etc., and the receiving device may be, but not limited to, a MEMS microphone, an electret microphone, etc. Among them, the receiving device satisfies ≥65dB SNR.

The earphone of the present invention makes full use of its own sound generating device and receiving device, does not need to add infrared sensors or other components, reduces the weight of the whole machine, simplifies the design, and reduces the cost. The present invention is sensitive to space size, has strict requirements on weight, and has better adaptability for earphone products that require as few components as possible. Without changing the original structure of the earphone and adding redundant components, the electro-acoustic transducer device of the earphone itself is multiplexed, and the original infrared distance sensor of the earphone device can be omitted, saving the space of the earphone. , Cost, reduces the difficulty of the earphone structure stacking design, reduces the weight of the earphone to increase the wearing comfort of the user.

In this embodiment, the sound emitting device satisfies a 2kHz bandwidth in the range of 20k-23kHz at a sampling rate of 48k, and a 4kHz bandwidth in the range of 20k-46kHz at a sampling rate of 96k.

In this embodiment, the receiving device satisfies a 2kHz bandwidth in the range of 20k-23kHz at a 48k sampling rate, and a 4kHz bandwidth in the range of 20k-46kHz at a 96k sampling rate.

Please further refer to FIG. 1, the earphone of the present invention can perform the following method for detecting the wearing state of the earphone. The method includes:

S0. Obtain the relationship curve between the second intensity parameter and the distance parameter; the peak value of the intensity parameter placed on the relationship curve is the third intensity parameter.

Under the premise that the first intensity parameter is constant, there is a certain functional relationship between the second intensity parameter received by the microphone and the distance between the headset and the user. As shown in Figure 4, the abscissa is the distance parameter D between the headset and the user. The ordinate is the intensity parameter A of the reflected wave collected by the receiving device. The specific change process is as follows:

1) When the earphone is completely in the ear, the distance between the earphone and the user is 0, and no reflected signal can be received, and the intensity parameter A is 0;

2) When the earphone is gradually taken out of the ear, the intensity parameter A rapidly increases to the peak value, which is the third intensity parameter Amax;

3) When the earphone is farther away, the intensity parameter A will gradually decrease at a relatively gentle rate due to the distance;

4) When the earphone is far away or there is no reflection at all, the signal strength of the reflected wave is 0 again.

It should be noted that the secondary sound hole 20 is located on the front cover 10 of the earphone, and the microphone is located on the bottom cover 30 of the earphone. When the earphone is completely worn into the human ear, the front cover 10 of the earphone and the ear canal form a closed space. At this time, the microphone is outside the closed space and cannot receive reflected ultrasonic waves, so no reflected signals can be received.

Therefore, the relationship curve includes the first area where the intensity parameter rapidly increases during the process of the user distance parameter gradually increasing, and the second area where the intensity parameter gradually decreases during the process of the user distance parameter gradually increasing.

S1. Transmit a detection ultrasonic wave, the detection ultrasonic wave has a stable first intensity parameter;

In this embodiment, when the earphone is put into the user’s ear, the sound pressure level of at least 40dB can be achieved when the detection ultrasonic wave is set. The wearing state detection of the earphone under the premise of using the earphone is more humane and the response is more sensitive.

S2. Collect the reflected wave of the detected ultrasonic wave, where the reflected wave includes a second intensity parameter and a distance parameter reflecting the distance between the earphone and the user.

The first intensity parameter, the second intensity parameter, and the third intensity parameter are all ultrasonic amplitude parameters received by the microphone. The microphone can detect the second intensity parameter by itself when it receives the second intensity parameter, and there is no need to add functional components to the microphone.

The distance parameter is the value of the distance between the headset and the user, which is calculated and analyzed by the time difference Δt between the original transmitted detection ultrasonic time and the received transmitted wave and the sound velocity c.

Specifically, collecting the reflected wave of the detected ultrasonic wave includes:

S21: Monitoring the second intensity parameter of the reflected wave;

S22: When the second intensity parameter is equal to the third intensity parameter, start to record the second intensity parameter and the distance parameter to obtain recorded data.

S23. When the intensity parameter of the reflected wave reaches Amax, it is helpful to distinguish the boundary. When the distance between the user and the headset changes, both the intensity parameter and the distance parameter are recorded in real time, so as to obtain a series of data. The above recorded data can be compared with The coordinate values in the relationship curve have a one-to-one correspondence.

S3. Based on the second intensity parameter and the distance parameter, determine whether the earphone has been put into the ear.

Specifically, it includes:

S31. When the second intensity parameter is zero, stop recording;

When the second intensity parameter is zero, that is, the microphone cannot collect the second intensity parameter. At this time, there are only two situations: 1. The earphone is completely inside the human ear and the microphone is isolated from the enclosed space; 2. The earphone is too far away from the user. Far, the transmitted wave has not been collected. The above two states are a kind of stable state of the earphone, which can be judged.

S32. Analyze whether the recorded data covers the first area or the second area;

S331. If the recorded data covers the first area, as shown in FIG. 5, it is the first area relationship curve, and the relationship between the intensity parameter A and the distance parameter D can completely cover the curve shown in FIG. The headset is completely in the ear.

S332. If the recorded data covers the second area, as shown in FIG. 6, it is a second area relationship curve, and when the relationship between the intensity parameter A and the distance parameter D can completely cover the curve shown in FIG. 6, it is determined that the curve shown in FIG. The headset has been completely removed.

Since the earphone may move back and forth at different distances, there may be a situation where it alternates between the first area and the second area. At this time, it is necessary to determine whether it has been in the ear to determine which area is fully covered.

The earphone wearing state detection method of the present invention transmits ultrasonic waves by sharing the sound device of the earphone, and the receiving device receives and analyzes the signal, so that it can be judged whether the earphone is in the ear, without adding other components, and without changing the structure and production process of the earphone , The accurate detection of whether the earphone is in the ear can be realized, which is conducive to the miniaturization and low cost of the earphone.

The above are only the embodiments of the present invention. It should be pointed out here that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present invention, but these all belong to the present invention. The scope of protection.

Claims

A method for detecting the wearing state of earphones, which is characterized in that it includes:

Transmitting a detection ultrasonic wave, the detection ultrasonic wave having a stable first intensity parameter;

Collecting the reflected wave of the detected ultrasonic wave, the reflected wave including a second intensity parameter and a distance parameter reflecting the distance between the earphone and the user; and

Based on the second intensity parameter and the distance parameter, it is determined whether the earphone has been in the ear.
The method for detecting the wearing state of the earphone according to claim 1, wherein before the collecting the reflected wave of the detected ultrasonic wave, the method comprises:

Acquiring the relationship curve between the second intensity parameter and the distance parameter;

The peak value of the intensity parameter placed on the relationship curve is the third intensity parameter.
The method for detecting the wearing state of the earphone according to claim 2, wherein the collecting the reflected wave of the detected ultrasonic wave comprises:

Monitoring the second intensity parameter of the transmitted wave;

When the second intensity parameter is equal to the third intensity parameter, start to record the second intensity parameter and the distance parameter to obtain recorded data.
The method for detecting the wearing state of the earphone according to claim 3, wherein the determining whether the earphone is already in the ear based on the second intensity parameter and the distance parameter comprises:

According to the relationship between the recorded data and the relationship curve, it is determined whether the earphone has been put into the ear.
The method for detecting a wearing state of a headset according to claim 4, wherein the relationship curve includes a first region where the second intensity parameter gradually becomes larger when the distance parameter gradually becomes larger, and the distance parameter When the second intensity parameter gradually becomes larger, the second area becomes smaller gradually; according to the relationship between the recorded data and the relationship curve, judging whether the earphone has been in the ear, including:

When the second intensity parameter is zero, stop recording;

Analyzing whether the recorded data covers the first area or the second area;

It is determined whether the earphone is already in the ear.
The method for detecting the wearing state of the earphone according to claim 5, wherein the determining whether the earphone is already in the ear comprises:

When the recorded data covers the first area, it is determined that the earphone is completely in the ear;

When the recorded data covers the second area, it is determined that the earphone has been completely taken out.
A headset, which is characterized in that it comprises:

Acoustic device for emitting and detecting ultrasonic waves; and

A receiving device for collecting the reflected wave of the detected ultrasonic wave;

Wherein, the detection ultrasonic wave and the reflected wave are used to detect whether the earphone is in the ear by the method for detecting the wearing state of the earphone according to any one of claims 1-6.
The earphone according to claim 7, wherein the sound emitting device is an earphone core, and the receiving device is a microphone.
The earphone according to claim 8, wherein the sound emitting device satisfies a 2kHz bandwidth in the range of 20k-23kHz at a sampling rate of 48k, and a 4kHz bandwidth in the range of 20k-46kHz at a sampling rate of 96k.
The earphone according to claim 8, wherein the receiving device satisfies a 2kHz bandwidth in the range of 20k-23kHz at a sampling rate of 48k, and a 4kHz bandwidth in the range of 20k-46kHz at a sampling rate of 96k.