A headphone sound leakage testing method and device

Abstract

The headphone sound leakage test method provided by the present invention sends a signal of the same frequency to the headphone to be tested through an audio analyzer to obtain a reference voltage for the headphone sound leakage test; under the reference voltage, a sweep frequency signal is sent to the headphone to be tested through the audio analyzer; a second test microphone is provided at a certain distance from the headphone to be tested, and the sound pressure signal of the second test microphone is measured by the audio analyzer; when the sound pressure signal measured by the second test microphone is less than a set decibel value, the sound leakage effect of the headphone to be tested is qualified, otherwise it is unqualified. The present invention also provides a headphone sound leakage test device based on the present method, by which the test standard for headphone sound leakage is obtained, which can effectively control the sound leakage problem of the headphone and improve the subjective experience of the wearer.

Description

Technical Field

[0001] The invention relates to the field of earphones, and in particular to an earphone sound leakage testing method and an apparatus thereof. Background Art

[0002] Headphones are a pair of conversion units that receive electrical signals from a media player or receiver and convert them into audible sound waves using a speaker close to the ear. Headphones can be separated from the media player and connected using Bluetooth wireless communication or a plug, so that you can listen to the audio alone without disturbing others, and also have good privacy. Headphones were originally used for telephones and radios, but with the popularity of portable electronic devices, headphones are mostly used in mobile phones, walkmans, radios, portable video games and digital audio players.

[0003] The problem of sound leakage from headphones not only affects people around and brings noise during actual use, but also easily leaks the privacy information of the wearer, such as leaking the content of a call that you don't want others to hear. At present, when producing headphones, the music audio of the headphones or the sidetone of the call mode are usually tested, but the sound leakage when the headphones are used is not tested. Although many people have proposed some ways to reduce the sound leakage of headphones in order to avoid serious sound leakage, no one has provided a test method and test standard for testing the sound leakage of headphones; and when consumers buy headphones, they often only judge the sound leakage through their own senses. Because different people have different subjective feelings and different requirements for the sound leakage effect of headphones, the standards cannot be unified. Summary of the invention

[0004] The purpose of the present invention is to provide a method for testing sound leakage of headphones. The method can obtain the sound leakage test standard of the headphones so that others are not affected during the use of the headphones, while also avoiding the leakage of the user's private information due to the sound leakage of the headphones.

[0005] To achieve the above object, the present invention provides a headphone sound leakage testing method, the method comprising the following steps:

[0006] S1, a first test microphone is provided at the headphone to be tested, and a signal with the same frequency as the headphone to be tested is sent to the headphone to be tested through an audio analyzer and a sound pressure signal from the first test microphone is received at the same time, and a reference voltage for the headphone leakage test is obtained according to the sound pressure signal;

[0007] S2, sending a frequency sweep signal to the headphone under test through the audio analyzer under the reference voltage;

[0008] S3, a second test microphone is arranged at a certain distance from the headphone to be tested, and the sound pressure signal of the second test microphone is measured by the audio analyzer;

[0009] S4, when the sound pressure signal measured by the second test microphone is less than a set decibel value, the sound leakage effect of the headphone to be tested is qualified, otherwise it is unqualified.

[0010] According to an embodiment of the present invention, the noise level in the environment of the headphone sound leakage test is lower than 30 decibels.

[0011] According to one embodiment of the present invention, in step S1, the earphone to be tested is placed on an artificial ear simulating a human torso, a constant frequency signal with a frequency of 1 kHz is sent to the earphone to be tested through the audio analyzer, and the voltage of the audio analyzer is adjusted. When the sound pressure signal measured by the audio analyzer at the artificial ear is 94 decibels, the voltage value of the audio analyzer at this time is set as the reference voltage.

[0012] According to an embodiment of the present invention, the sweep frequency signal ranges from 20 Hz to 20 kHz.

[0013] According to an embodiment of the present invention, in step S3, the distance between the second test microphone and the headset to be tested is 50 cm.

[0014] According to an embodiment of the present invention, in the step S4, when the sound pressure signal measured by the second test microphone is less than 55 decibels, the sound leakage effect of the earphone to be tested is qualified, otherwise it is unqualified.

[0015] Another object of the present invention is to provide a headphone sound leakage test device, characterized in that the device is in a soundproof room with a noise level lower than 30 decibels, and comprises an audio analyzer, an artificial ear, a headphone to be tested, a first test microphone and a second test microphone.

[0016] The audio analyzer is connected to the earphone to be tested, a first test microphone and a second test microphone respectively. The first test microphone and the second test microphone are both used to receive sound pressure signals from the earphone to be tested. The earphone to be tested is worn on the artificial ear. The first test microphone is arranged at the artificial ear. The distance between the earphone to be tested and the second test microphone is 50CM. The audio analyzer is used to send signals to the earphone to be tested, and is also used to measure the sound pressure signals of the earphone to be tested at the artificial ear and the sound pressure signals of the second test microphone.

[0017] The headphone sound leakage test method provided by the present invention sends a signal of the same frequency to the headphone to be tested through an audio analyzer to obtain a reference voltage for the headphone sound leakage test; keeping the reference voltage unchanged, a frequency sweep signal is sent to the headphone to be tested through the audio analyzer; a second test microphone is provided at a certain distance from the headphone to be tested, and the sound pressure signal of the second test microphone is measured by the audio analyzer; when the sound pressure signal measured by the second test microphone is less than a set decibel value, the sound leakage effect of the headphone to be tested is qualified, otherwise it is unqualified. The test standard for headphone sound leakage is obtained by this method, which can effectively control the sound leakage problem of the headphone and improve the subjective experience of the wearer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the flow of the headphone sound leakage testing method provided by the present invention;

[0019] Figure 2 A schematic diagram of an embodiment of the present invention;

[0020] Figure 3 This is a schematic structural diagram of the headphone sound leakage testing device provided by the present invention. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0022] like Figure 1 As shown, a method for testing sound leakage of earphones is provided, the method comprising the following steps:

[0023] S1, a first test microphone is provided at the headphone to be tested. In the embodiment of the present invention, the first test microphone is provided at an artificial ear in a simulated human torso, the headphone to be tested is worn on the artificial ear, and a signal with the same frequency is sent to the headphone to be tested through an audio analyzer, and a sound pressure signal from the first test microphone is received at the same time, and a reference voltage for the headphone leakage test is obtained according to the sound pressure signal;

[0024] S2, sending a frequency sweep signal to the headphone under test through the audio analyzer under the reference voltage;

[0025] S3, a second test microphone is arranged at a certain distance from the headphone to be tested, and a sound pressure signal of the second test microphone is measured by an audio analyzer;

[0026] S4, when the sound pressure signal measured by the second test microphone is less than a set decibel value, the sound leakage effect of the headphone to be tested is qualified, otherwise it is unqualified.

[0027] In the embodiment of the present invention, the noise level in the environment of the headphone sound leakage test is lower than 30 decibels, and the test is usually conducted in a soundproof room.

[0028] In the embodiment of the present invention, due to different earphones worn at the simulated ear, the voltage signals provided by the audio analyzer under the condition of generating the same sound pressure are different. In order to more accurately obtain the sound leakage of the earphone and a more unified test standard, it is usually necessary to first determine the reference voltage of the earphone sound leakage test. The reference voltage of the earphone sound leakage test is obtained by the present invention as follows: the earphone to be tested is placed on the simulated ear in the simulated human torso, a constant frequency signal with a frequency of 1kHz is sent to the earphone to be tested through the audio analyzer, and the voltage of the audio analyzer is adjusted so that the sound pressure at the simulated ear located in the simulated human torso changes, and the sound pressure signal changing at the simulated ear is monitored in real time by the audio analyzer. When the sound pressure signal monitored by the audio analyzer through the first test microphone is 94 decibels, the voltage of the audio analyzer is stopped from being adjusted, and the voltage value of the audio analyzer at this time is set as the reference voltage. When sound leakage detection is performed on different earphones, the sound leakage reference voltage needs to be calibrated before the following sound leakage detection can be started.

[0029] The frequency range of the commonly used headphone signal is uncertain. In order to accurately detect the sound leakage effect of the headphone, the present invention sends a sweep frequency signal to the headphone to be tested through an audio analyzer, wherein the sweep frequency signal range is 20Hz to 20kHz. Figure 2 The following are experimental data of sound leakage test of two earphones. The main frequency bands of sound leakage are 20Hz-1.5kHz and 5kHz-8kHz. It can be seen that when the signal frequency of earphone 1 is 6kHz to 7kHz, the sound pressure signal measured by the second test microphone is 60 decibels. When it is 5kHz, the sound pressure signal of the second test microphone is 56 decibels. It can be seen that earphone 1 has serious sound leakage and is unqualified. However, within the signal frequency range, the sound pressure signal measured by the second test microphone of earphone 2 is up to 54 decibels, which are both less than 55 decibels. The sound leakage is not serious and it is a qualified earphone.

[0030] In the embodiment of the present invention, the second test microphone is preferably facing the position of the earphone to be tested, and the distance between the second test microphone and the earphone to be tested is 50CM. At this time, if the sound pressure signal measured by the second test microphone is less than 55 decibels, the sound leakage effect of the earphone to be tested is qualified, otherwise it is unqualified.

[0031] When the distance between the second test microphone and the headphone to be tested is not 50CM, the sound pressure standard of 55 dB monitored by the second test microphone will change. The specific calculation method is as follows:

[0032] Where r1=50CM, r2 is the actual distance between the second test microphone and the headphone to be tested. That is, when the distance between the second test microphone and the headphone to be tested is r2, the sound pressure signal monitored by the second test microphone is less than 55dB+ΔdB, then the headphone to be tested is qualified, otherwise it is unqualified.

[0033] In addition, the present invention provides a headphone sound leakage test device based on the headphone sound leakage test method, and the device is placed in a soundproof room with a noise level lower than 30 decibels. Figure 3 As shown, the system comprises an audio analyzer 10, an artificial ear 20 simulating a human body trunk, a headphone to be tested 30, a first test microphone (not shown in the figure) and a second test microphone 40.

[0034] The audio analyzer 10 is connected to the earphone 30 to be tested, the first test microphone and the second test microphone 40 respectively. The first test microphone and the second test microphone 40 are both used to receive the sound pressure signal from the earphone 30 to be tested. The earphone 30 to be tested is worn on the artificial ear. The first test microphone is set at the artificial ear. The distance between the earphone 30 to be tested and the second test microphone 40 is 50CM. The audio analyzer 10 is used to send a signal to the earphone 30 to be tested, and is also used to measure the sound pressure signal of the earphone 30 to be tested at the artificial ear 20 and the sound pressure signal of the second test microphone 40.

[0035] In summary of the above, the headphone sound leakage test method provided by the present invention sends a signal of the same frequency to the headphone to be tested through an audio analyzer to obtain a reference voltage for the headphone sound leakage test; keeps the reference voltage unchanged, and sends a sweep frequency signal to the headphone to be tested through the audio analyzer; a second test microphone is set at a certain distance from the headphone to be tested, and the sound pressure signal of the second test microphone is measured by the audio analyzer; when the sound pressure signal measured by the second test microphone is less than a set decibel value, the sound leakage effect of the headphone to be tested is qualified, otherwise it is unqualified. The test standard for headphone sound leakage is obtained by this method, which can effectively control the sound leakage problem of the headphone and improve the subjective experience of the wearer.

[0036] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A method for testing sound leakage of headphones, characterized in that: The method comprises the following steps: S1, placing the earphone to be tested on an artificial ear simulating a human body torso, and providing a first test microphone at the earphone to be tested, sending a constant frequency signal of 1 kHz to the earphone to be tested through an audio analyzer, and adjusting the voltage of the audio analyzer, when the sound pressure signal measured by the audio analyzer at the artificial ear is 94 decibels, setting the voltage value of the audio analyzer at this time as a reference voltage; S2, after determining the reference voltage, under the premise of keeping the reference voltage unchanged, sending a frequency sweep signal to the headphone to be tested through the audio analyzer; S3, a second test microphone is arranged at a certain distance from the headphone to be tested, the second test microphone is used to receive the sound leakage signal of the headphone to be tested, and the sound pressure signal of the second test microphone is measured by the audio analyzer, the distance between the headphone to be tested and the second test microphone is r2, and r2 is greater than or equal to 50CM; S4, when the sound pressure signal measured by the second test microphone is less than 55dB+△dB, the sound leakage effect of the headphone to be tested is qualified, otherwise it is unqualified, r1=50CM.

2. The headphone sound leakage testing method according to claim 1, characterized in that: The noise level in the environment of the headphone sound leakage test is less than 30 decibels.

3. The headphone sound leakage testing method according to claim 1, characterized in that: The sweep frequency signal ranges from 20 Hz to 20 kHz.

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