Test toolTechnical Field
The invention relates to the technical field of acoustics, in particular to a test tool for testing the performance of a headset.
Background
With the wide application of portable electronic products such as high-quality smart phones and pads, people have higher and higher requirements on acoustic parameters of earphones which can be used in cooperation with the portable electronic products, for example, in a test on Total Harmonic Distortion (THD) of the acoustic parameters of the earphones, a parameter control frequency band tends to be low frequency, detection is required from 20Hz or from 40Hz, and more hi-res (high resolution Audio) earphones are provided, the performance starting frequency is marked to be 5 Hz.
At present, it is common to test the headset in an anechoic chamber to ensure the best possible elimination of ambient noise. In actual production, however, each earphone needs to be subjected to acoustic parameter testing, and it is impossible to perform testing in an anechoic chamber; in addition, many people on the production line, the environmental noise is much higher than that of the anechoic chamber, the test is carried out in the environment by generally adding an anechoic box, the anechoic box is a closed box, receiving equipment such as anechoic cotton and a simulation ear is arranged in the anechoic box, the environment of the anechoic chamber is simulated as far as possible, the acoustic parameters are not influenced by the external noise environment as far as possible, and the test accuracy is ensured.
The existing functional block diagram for isolating external environmental noise by using a closed muffling box and constructing a closed muffling environment to perform acoustic performance testing is shown in fig. 1. Slight interference to the box body in the test process can cause inaccurate performance test results and even test failure; in addition, because need the case switch box of many times, also there are the efficiency of software testing low, the complicated scheduling problem of test step, and the test cost is high, and is slow.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a testing tool, so as to solve the problems of low testing efficiency, poor testing accuracy, and complex operation of the existing earphone.
The invention provides a test tool, which comprises a test bottom plate, a signal processing module, a simulated ear and a standard microphone, wherein the simulated ear and the standard microphone are arranged on the test bottom plate; the earphone to be tested receives a sound signal sent by a sound card controlled by a testing computer and sends the sound signal through an earphone loudspeaker of the earphone to be tested; the simulated ear receives an external noise signal and a sound signal sent by the earphone to be tested, and feeds back the acquired external noise signal and the sound signal sent by the earphone to be tested to the signal processing module; meanwhile, the standard microphone picks up an external noise signal and synchronously transmits the external noise signal to the signal processing module; the signal processing module removes the external noise signal received by the artificial ear according to the sound signal fed back by the artificial ear, the external noise signal and the external noise signal fed back by the standard microphone, transmits the sound signal without the external noise signal to the testing computer, and acquires the acoustic testing parameters of the earphone to be tested.
In addition, the preferred scheme is that a test microphone is arranged in the simulation ear, and the test microphone is used for receiving an external noise signal and a sound signal emitted by the earphone to be tested, and feeding back the acquired external noise signal and the sound signal emitted by the earphone to be tested to the signal processing module.
In addition, it is preferred that the structure of the simulated ear is adapted to the structure of the headset to be tested.
In addition, the signal processing module is preferably arranged on the test base plate; or the signal processing module is arranged in the testing computer.
In addition, it is preferable that a power amplifier is disposed between the sound card and the headset to be tested, and the power amplifier is used for amplifying the sound signal output by the sound card.
In addition, a preferable scheme is that a measuring amplifier is arranged between the simulated ear and the signal processing module, and the measuring amplifier is used for amplifying an external noise signal picked up by the simulated ear and a sound signal emitted by the earphone to be tested.
Furthermore, it is preferred that the acoustic test parameters comprise a frequency response and/or a harmonic distortion and/or a phase.
In addition, it is preferable that the signal processing module includes a DSP chip and an algorithm stored in the DSP chip.
In addition, the preferred scheme is that the artificial ear comprises a left artificial ear and a right artificial ear, and corresponding test microphones are arranged in the left artificial ear and the right artificial ear.
In addition, the preferable scheme is that a support seat is vertically arranged on the test bottom plate, and the standard microphone is fixed on the support seat; and, the standard microphone is located between the left and right artificial ears.
The testing tool can be applied to a production environment with larger noise, and the testing accuracy can be ensured without using a silencing box, so that the testing cost is saved; meanwhile, the box opening and closing operation in the existing test is avoided, the test efficiency is effectively improved, and the test time is saved.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Further, the present invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a schematic block diagram of a conventional earphone performance test;
FIG. 2 is a functional block diagram of a test fixture according to an embodiment of the present invention;
fig. 3 is a flow chart of testing an earphone according to an embodiment of the present invention.
The same reference numbers in all figures indicate similar or corresponding features or functions.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.
In order to describe the structure of the earphone according to the embodiment of the present invention in detail, the earphone according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 2 illustrates the principle of a test fixture according to an embodiment of the present invention.
As shown in fig. 2, the test fixture of the embodiment of the present invention, a test computer, and a sound card connected to the test computer complete the test of the performance of an earphone together, wherein the test fixture includes an open test base plate (not shown in the figure), a signal processing module, a simulated ear and a standard microphone, the simulated ear and the standard microphone are disposed on the test base plate, the earphone to be tested is placed in the simulated ear, during the test of the earphone to be tested, the earphone to be tested is directly fixed in the corresponding simulated ear in a limited manner, then the sound card is controlled by the test computer to emit a sound signal, and the sound signal is transmitted to the earphone to be tested, and the earphone to be tested receives the sound signal and emits a sound signal through an internal earphone speaker; the earphone to be tested is placed in the simulated ear, so that the simulated ear can receive an external noise signal and a sound signal sent by the earphone to be tested and feed back the obtained external noise signal and the sound signal sent by the earphone to be tested to the signal processing module; meanwhile, the standard microphone also picks up the external noise signal and synchronously transmits the picked external noise signal to the signal processing module; the signal processing module removes the external noise signal received by the artificial ear according to the sound signal fed back by the artificial ear, the external noise signal and the external noise signal fed back by the standard microphone, transmits the sound signal without the external noise signal to the testing computer, and acquires the acoustic testing parameters of the earphone to be tested.
Specifically, the test fixture of the embodiment of the invention is provided with two simulated ears, the structures of the simulated ears are matched with the structure of the earphone to be tested, and each simulated ear is internally provided with a corresponding test microphone which is used for receiving an external noise signal and a sound signal sent by the earphone to be tested and feeding back the obtained external noise signal and the sound signal sent by the earphone to be tested to the signal processing module.
In an embodiment of the present invention, the signal processing module may include a Digital Signal Processor (DSP) chip, an algorithm stored in the DSP chip, and the like, and the signal processing module may be disposed on the test board and connected to the test computer, or may be directly disposed inside the test computer, and the signal processing module is used to eliminate an external noise signal in a signal (including a sound signal and an external noise signal) received by the artificial ear, so as to ensure that the sound signal transmitted to the test computer is not interfered by an external environment, and improve the accuracy of the noise reduction earphone detection.
Specifically, a power amplifier is arranged between the sound card and the earphone to be tested and is used for amplifying the sound signal output by the sound card; and a measuring amplifier is arranged between the simulated ear and the signal processing module and is used for amplifying the external noise signal picked up by the simulated ear and the sound signal sent by the earphone to be tested.
As shown in fig. 2, the testing computer drives the sound card to emit an original sound signal, the sound signal is amplified by the power amplifier and then transmitted to the earphone to be tested, the earphone to be tested receives the amplified sound signal and sounds through the speaker unit, in the sound production process of the speaker unit, the sound signal and the external noise signal are simultaneously and indirectly transmitted to the artificial ear through the air and are picked up by the testing microphone in the artificial ear, and the external noise signal and the sound signal picked up by the testing microphone are amplified by the measuring amplifier and then transmitted to the signal processing module.
In addition, a measuring amplifier is also arranged between the standard microphone and the signal processing module, when the earphone to be tested is detected, the standard microphone simultaneously picks up an external noise signal, and the external noise signal is amplified by the measuring amplifier and then transmitted to the signal processing module. Finally, the signal processing module processes the sound signal and the external noise signal fed back by the received artificial ear and the external noise signal fed back by the standard microphone, so that the external noise signal received by the artificial ear is filtered, the final sound signal is obtained and transmitted to the testing computer, and the acoustic testing parameters of the earphone to be tested are obtained through testing software in the testing computer. The acoustic test parameters comprise frequency response and/or harmonic distortion and/or phase parameters.
In another embodiment of the present invention, the artificial ear includes a left artificial ear and a right artificial ear, and the left artificial ear and the right artificial ear are respectively provided with a corresponding testing microphone, and the testing microphones can receive a sound signal emitted by the to-be-tested earphone and can also simultaneously pick up an external noise signal. In addition, in order to ensure the consistency of the external noise signal received by the test microphone and the external noise signal received by the standard microphone, a supporting seat can be vertically arranged on the test bottom plate, and the standard microphone is fixed on the supporting seat; and, the standard microphone is located between the left and right artificial ears.
The following describes in detail a test flow of the test fixture according to an embodiment of the present invention. Fig. 3 shows a flow of testing a headset according to an embodiment of the present invention.
As shown in fig. 3, the earphone testing process according to the embodiment of the present invention includes the following steps:
s310: the testing computer controls the sound card to send out a sound signal and transmits the sound signal to the earphone to be tested, and the earphone to be tested receives the sound signal sent out by the sound card controlled by the testing computer and sends out the sound signal through the earphone loudspeaker of the earphone to be tested.
S320: the simulated ear receives an external noise signal and a sound signal sent by an earphone (a loudspeaker unit) to be tested at the same time, and feeds back the acquired external noise signal and the sound signal sent by the earphone to be tested to the signal processing module.
S330: while step S320 is performed, the standard microphone picks up the external noise signal and synchronously transmits the external noise signal to the signal processing module.
S340: the signal processing module removes the external noise signals received by the simulated ears according to the sound signals fed back by the simulated ears, the external noise signals and the external noise signals fed back by the standard microphone, transmits the sound signals without the external noise signals to the testing computer, and finally obtains the acoustic testing parameters of the earphone to be tested.
According to the embodiment, on one hand, the test tool provided by the invention is an open test tool, and can be used for monitoring noise signals in a test environment in real time through a standard microphone, so that accurate test in the open environment is achieved, links such as opening and closing of a closed test box are avoided, and the product test efficiency is effectively improved. On the other hand, the standard microphone has a wide application frequency band range, can be applied to the production environment of a factory, can ensure the test accuracy of the earphone to be tested without using a sound muffling box, saves the production cost and improves the production efficiency.
A test fixture according to the present invention is described above by way of example with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that various modifications may be made to the test tool set forth above without departing from the scope of the invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.