JP6228737B2 - Measuring system and measuring method - Google Patents

Description

  The present invention relates to a measurement system and a measurement method for measuring vibration of an electronic device that transmits sound to a user by vibration transmission by pressing a vibrating body held in a housing against a human ear.

  Patent Document 1 describes an electronic device such as a mobile phone that transmits air conduction sound and bone conduction sound to a user (user). Patent Document 1 describes that air conduction sound is sound that is transmitted to the eardrum through the ear canal through the vibration of air that is caused by the vibration of an object, and is transmitted to the user's auditory nerve by the vibration of the eardrum. Has been. Patent Document 1 describes that the bone conduction sound is a sound transmitted to the user's auditory nerve through a part of the user's body (for example, the cartilage of the outer ear) that contacts the vibrating object. .

  In the telephone set described in Patent Document 1, it is described that a short plate-like vibrating body made of a piezoelectric bimorph and a flexible material is attached to the outer surface of a housing via an elastic member. Further, in Patent Document 1, when a voltage is applied to the piezoelectric bimorph of the vibrating body, the vibrating body vibrates due to expansion and contraction of the piezoelectric material in the longitudinal direction, and when the user brings the vibrating body into contact with the auricle, It is described that the air conduction sound and the bone conduction sound are transmitted to the user. In addition, unlike the telephone described in Patent Document 1, the applicant of the present invention vibrates a panel such as a display panel or a protection panel arranged on the surface of a mobile phone with a piezoelectric element, and generates air conduction sound generated thereby. In addition, we are developing mobile phones that transmit sound using vibration sound, which is a sound component by vibration transmission that is transmitted when a vibrating panel is applied to a human ear.

JP 2005-348193 A

  By the way, an electronic device having a vibrating body such as a telephone like Patent Document 1 or a piezoelectric receiver that transmits some sound by vibration of a mobile phone or the like has characteristics of the vibrating body at the manufacturing stage in managing the specifications of the device. It is desirable to inspect and evaluate the equipment. However, conventionally, no consideration is given to evaluation and specification management of an electronic device including a vibrating body.

  The present invention has been made in view of the above-described viewpoints, and it is an object of the present invention to provide a measurement system and a measurement method that can correctly evaluate an electronic device having a vibrating body that transmits sound by vibration transmission and can easily manage specifications. To do.

A measurement system for evaluating electronic devices to communicate to the user the sound by the vibration transmitted by pressing a measurement system vibration body according to the present invention for achieving the object in the body of the ear, imitating the human ear An ear model including an ear model and an artificial external ear canal unit to which the ear model is coupled, a vibration detection unit for detecting vibration transmitted to the ear model unit, and the ear model of the artificial external ear canal part opposite to the ear model A microphone disposed on the end face, a storage unit that stores a first test signal corresponding to a predetermined test sound, and a generation unit that generates a second test signal corresponding to a test sound different from the predetermined test sound And a control unit, wherein the control unit detects vibration of the vibrating body that vibrates in accordance with the first test signal or the second test signal, and detects the vibration with the microphone. Passed through the external ear canal To detect the pressure.

  ADVANTAGE OF THE INVENTION According to this invention, the electronic device which has a vibrating body which transmits a sound by vibration transmission can be evaluated correctly, and specification management becomes easy.

It is a figure which shows schematic structure of the measurement system which concerns on one embodiment. It is a top view which shows an example of an electronic device. It is a figure which shows the structure of a vibration pick-up apparatus. It is a partial detail view of a vibration measuring head. It is a functional block diagram of the principal part of a measurement system. It is a figure which shows the example of a signal signal and a test signal. It is a modification of the functional block diagram of the principal part of a measurement system. It is a figure which shows an example of an evaluation application screen. It is a figure which shows an example of a measurement result. It is a modification of the functional block diagram of the principal part of a measurement system. It is a figure which shows schematic structure of the principal part of the measurement system of a different structure. It is a partial detailed view of a measurement system with a different configuration.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating a schematic configuration of a measurement system according to an embodiment. A measurement system 10 according to the present embodiment is for evaluating an electronic device 100 to be measured having a vibrating body, and is connected to the electronic device mounting unit 20 and the electronic device mounting unit 20 and the electronic device 100. A measurement unit 200. The electronic device mounting unit 20 includes a vibration measurement head 40 supported by the base 30 and a holding unit 70 that holds the electronic device 100 to be measured. In the following description, the electronic device 100 is a mobile phone such as a smartphone having a rectangular panel 102 larger than a human ear on the surface of a rectangular casing 101 as shown in a plan view in FIG. A piezoelectric element is attached to the back surface of the panel 102, and the panel 102 vibrates as a vibrating body by driving the piezoelectric element.

  First, the vibration measuring head 40 will be described. The vibration measuring head 40 includes an ear mold portion 50 and a vibration pickup device 55. The ear mold part 50 imitates the human ear and includes an ear model 51 and an artificial external ear canal part 52 coupled to the ear model 51. The ear mold 50 shown in FIG. 1 corresponds to the left ear of a person. An artificial external ear canal 53 is formed in the central portion of the artificial external ear canal portion 52. The artificial external ear canal 53 is formed with a hole diameter of 5 mm to 10 mm, which is an average diameter of a human external ear canal. The ear mold part 50 is detachably supported by the base 30 via a support member 54 at the peripheral part of the artificial external ear canal part 52.

  The ear mold part 50 is made of, for example, a material similar to the material of an average ear model used for, for example, HATS (Head And Torso Simulator) of a human body model or KEMAR (a name of an electronic mannequin for acoustic research of Knowles). It consists of the material based on IEC60318-7. This material can be formed of a material such as rubber having a hardness of 35 to 55, for example. The rubber hardness may be measured in accordance with, for example, international rubber hardness (IRHD / M method) compliant with JIS K 6253 or ISO 48. As a hardness measurement system, a fully automatic type IRHD / M method micro size international rubber hardness meter GS680 manufactured by Teclock Co., Ltd. is preferably used. In addition, considering the variation in the hardness of the ear depending on the age, the ear mold portion 50 may be prepared by roughly preparing two or three types of different hardness, and replacing them.

  The thickness of the artificial external auditory canal 52, that is, the length of the artificial external auditory canal 53 corresponds to the length to the human eardrum (cochlea), and is appropriately set within a range of, for example, 5 mm to 50 mm, preferably 8 mm to 30 mm. . In the present embodiment, the length of the artificial external ear canal 53 is approximately 30 mm.

  As shown in FIG. 3A and a front view of FIG. 3A and FIG. 3B, the vibration pickup device 55 has a plate shape having a hole 56a having the same diameter as the artificial ear canal 53, for example, a diameter of 7 mm. The vibration transmission member 56 and one vibration pickup 57 constituting a vibration detection unit coupled to a part of one surface of the vibration transmission member 56 are provided. In the present embodiment, the other surface of the vibration transmitting member 56 is bonded to the end surface of the artificial external auditory canal portion 52 opposite to the ear model 51 side so that the hole 56a communicates with the artificial external auditory canal 53. In addition, the vibration pickup 57 is coupled to one surface of the vibration transmission member 56 via, for example, an adhesive or grease. The vibration pickup 57 is connected to the measurement unit 200.

  Here, the vibration transmission member 56 can be made of a material having good vibration transmission efficiency, for example, metal, alloy such as iron, SUS, brass, aluminum, titanium, or plastic, but is light in terms of detection sensitivity. Preferably, it is made of a material. Further, the vibration transmitting member 56 may have a rectangular outer shape such as a square flat washer. However, since the displacement amount of the ear mold portion 50 is large in the peripheral portion of the artificial external ear canal 53, a round shape is used in the present embodiment. It has a ring shape like a flat washer. The ring-shaped outer shape can be formed, for example, by adding 6 to 20 mm which is the width of the ring to the diameter 10 to 30 mm of the hole 56a, that is, the outer diameter of the ring is about 20 to 70 mm. Further, the thickness of the vibration transmitting member 56 is appropriately set according to the strength of the material. Specifically, the diameter of the hole 56a may be 25 mm, the width may be 5 mm, the outer diameter of the ring may be 35 mm, and the thickness may be 0.1 mm using a SUS plate.

  As the vibration pickup 57, a known small vibration pickup can be used. In the present embodiment, a piezoelectric acceleration pickup is used as the vibration pickup 57, and the piezoelectric acceleration pickup is attached to the vibration transmission member 56 via a bonding member such as grease or an instantaneous adhesive such as Aron Alpha (registered trademark). Are connected.

  Furthermore, the vibration measuring head 40 includes a microphone device 60 for measuring the sound pressure of the sound propagated through the artificial external ear canal 53. As shown in FIG. 4A, the microphone device 60 is a plan view seen from the base 30 side, and FIG. 4B is a cross-sectional view taken along the line bb of FIG. A tube member 61 extending from an outer wall (peripheral wall of the hole) through a hole 56a of the vibration transmission member 56 of the vibration pickup device 55, and a microphone 62 constituting a sound pressure measurement unit held by the tube member 61 are provided.

  The microphone 62 includes, for example, a measurement capacitor microphone having a flat output characteristic in the measurement frequency range of the electronic device 100 and a low self-noise level. The microphone 62 is arranged such that the sound pressure detection surface substantially coincides with the end surface of the artificial external ear canal unit 52. The microphone 62 may be fixed to the outer wall of the artificial external ear canal 53, for example. Alternatively, it may be supported by the artificial external auditory canal 52 or the base 30 and arranged in a floating state from the outer wall of the artificial external auditory canal 53. The microphone 62 is connected to the measurement unit 200. In FIG. 4A, the artificial external auditory canal portion 52 has a rectangular shape, but the artificial external auditory canal portion 52 can have an arbitrary shape.

  Next, the holding unit 70 will be described. In the case where the electronic device 100 is a mobile phone having a rectangular shape in a plan view such as a smartphone, when a person tries to hold the mobile phone with one hand and press it against his / her ear, the both sides of the mobile phone are usually held by hands. Will be supported by. In addition, the pressing force and the contact posture of the mobile phone with respect to the ear vary depending on the person (user) or fluctuate during use. In the present embodiment, electronic device 100 is held by imitating such a usage mode of a mobile phone.

  Therefore, the holding part 70 includes support parts 71 that support both side parts of the electronic device 100. The support portion 71 is attached to one end portion of the arm portion 72 so as to be rotatable and adjustable around an axis y1 parallel to the y axis in a direction in which the electronic device 100 is pressed against the ear mold portion 50. The other end of the arm portion 72 is coupled to a movement adjusting portion 73 provided on the base 30. The movement adjusting unit 73 moves the arm unit 72 in the direction parallel to the x axis orthogonal to the y axis, the vertical direction x1 of the electronic device 100 supported by the support unit 71, and the z axis orthogonal to the y axis and the x axis. In a direction parallel to the direction z1 in which the electronic device 100 is pressed against the ear mold portion 50.

  As a result, the electronic device 100 supported by the support portion 71 adjusts the support portion 71 about the axis y1 or adjusts the movement of the arm portion 72 in the z1 direction. 102) is pressed against the ear mold 50. In the present embodiment, the pressing force is adjusted in the range of 0N to 10N, preferably in the range of 3N to 8N.

  Here, the range of 0N to 10N is intended to enable measurement in a sufficiently wide range than the pressing force assumed for a human to press an electronic device against his / her ear and use it for talking or the like. It is said. In the case of 0N, for example, not only when the ear mold part 50 is in contact but not pressed, it can be held away from the ear mold part 50 in increments of 1 mm to 1 cm, and measurement can be performed at each separation distance. You may be able to do it. As a result, the degree of attenuation due to the distance of the airway sound can be measured by the microphone 62, and convenience as a measurement system is improved. In addition, the range of 3N to 8N normally assumes an average force range that a normal hearing person presses against an ear when making a call using a conventional speaker. Although there may be differences depending on race and gender, in general, in electronic devices such as smartphones and conventional mobile phones equipped with conventional speakers, vibration and airway sounds are usually generated with a pressing force that is pressed by the user. It is preferable that it can be measured.

  In addition, by adjusting the movement of the arm unit 72 in the x1 direction, the contact posture of the electronic device 100 with respect to the ear mold unit 50 is, for example, the posture in which the panel 102 which is an example of a vibrating body covers almost the entire ear mold unit 50 As shown in FIG. 1, the panel 102 is adjusted so as to cover a part of the ear mold portion 50. The arm portion 72 is configured to be movable and adjustable in a direction parallel to the y-axis, or is configured to be rotatable and adjustable around an axis parallel to the x-axis and the z-axis, so that the ear-shaped portion 50 can be adjusted. Thus, the electronic device 100 may be configured to be adjustable to various contact postures. Needless to say, the vibrating body is not limited to a panel that covers a wide range of ears, but an electronic device having protrusions and corners that transmit vibration only to a part of the ear mold 50, for example, the part of the tragus. Even a device can be a measurement object of the present invention.

  Next, the configuration of the measurement unit 200 in FIG. 1 will be described with reference to FIG. FIG. 5 is a functional block diagram of the main part of the measurement system of FIG. The measurement unit 200 includes a sensitivity adjustment unit 300, a signal processing unit 400, a PC (personal computer) 500, and a printer 600.

  Outputs of the vibration pickup 57 and the microphone 62 are supplied to the sensitivity adjustment unit 300. The sensitivity adjustment unit 300 includes a variable gain amplification circuit 301 that adjusts the amplitude of the output of the vibration pickup 57 and a variable gain amplification circuit 302 that adjusts the amplitude of the output of the microphone 62. The variable gain amplifier circuits 301 and 302 independently adjust the amplitude of the analog input signal corresponding to each circuit to a required amplitude manually or automatically. Thereby, the error of the sensitivity of the vibration pickup 57 and the sensitivity of the microphone 62 is corrected. Note that the variable gain amplifier circuits 301 and 302 are configured so that the amplitude of the input signal can be adjusted within a range of ± 50 dB, for example. The output of the sensitivity adjustment unit 300 is supplied to the signal processing unit 400.

  The signal processing unit 400 includes an A / D conversion unit 410, a frequency characteristic adjustment unit 420, a phase adjustment unit 430, an output synthesis unit 440, a frequency analysis unit 450, a storage unit 460, an acoustic signal output unit 480, and a signal processing control unit 470. Prepare. The A / D conversion unit 410 converts an output of the variable gain amplification circuit 301 into a digital signal, an A / D conversion circuit (A / D) 411, and an A / D that converts the output of the variable gain amplification circuit 302 into a digital signal. A conversion circuit (A / D) 412. The A / D conversion circuits 411 and 412 can handle, for example, 16 bits or more and 96 dB or more in terms of dynamic range. The A / D conversion circuits 411 and 412 can be configured so that the dynamic range can be changed. The output of the A / D conversion unit 410 is supplied to the frequency characteristic adjustment unit 420.

  The frequency characteristic adjustment unit 420 detects an equalizer (EQ) 421 that adjusts a frequency characteristic of a detection signal by the vibration pickup 57 that is an output of the A / D conversion circuit 411 and a microphone 62 that is an output of the A / D conversion circuit 412. And an equalizer (EQ) 422 for adjusting the frequency characteristics of the signal. The equalizers 421 and 422 independently adjust the frequency characteristics of the respective input signals manually or automatically to frequency characteristics close to a human audibility. Note that the equalizers 421 and 422 are composed of, for example, a multiband graphical equalizer, a low-pass filter, a high-pass filter, and the like. The output of the frequency characteristic adjustment unit 420 is supplied to the phase adjustment unit 430.

  The phase adjustment unit 430 includes a variable delay circuit 431 that adjusts the phase of a detection signal by the vibration pickup 57 that is an output of the equalizer 421. Since the speed of sound transmitted through the material of the ear mold 50 and the speed of sound transmitted through the flesh and bones of the human body are not exactly the same, the phase relationship between the output of the vibration pickup 57 and the output of the microphone 62 is particularly high at a high frequency. It is assumed that the deviation becomes large. Then, when both outputs are combined in the output combining unit 440 described later, an amplitude peak or dip may appear at a timing different from the actual time, or the combined output may increase or decrease. Therefore, the phase of the detection signal by the vibration pickup 57 that is the output of the equalizer 421 can be adjusted within a predetermined range by the variable delay circuit 431 according to the measurement frequency range of the electronic device 100 to be measured.

  For example, when the measurement frequency range of the electronic device 100 is 100 Hz to 10 kHz, a unit smaller than at least 0.1 ms (equivalent to 10 kHz) in a range of about ± 10 ms (equivalent to ± 100 Hz) by the variable delay circuit 431, for example, 0.04 μs unit Thus, the phase of the detection signal from the vibration pickup 57 is adjusted. Even in the case of a human ear, a phase shift occurs between the bone conduction sound (vibration transmission component) and the air conduction sound (air conduction component). Therefore, the phase adjustment by the variable delay circuit 431 is performed by the vibration pickup 57 and the microphone 62. It does not mean that the phases of both detection signals are matched, but means that the phases of both are matched to the actual audibility of the ear. The output of the phase adjustment unit 430 is supplied to the output synthesis unit 440.

  The output combining unit 440 combines the detection signal from the vibration pickup 57 whose phase has been adjusted by the variable delay circuit 431 and the detection signal from the microphone 62 that has passed through the phase adjustment unit 430. As a result, it is possible to obtain the vibration amount and sound pressure transmitted by the vibration of the electronic device 100 to be measured, that is, the sensory sound pressure obtained by synthesizing the vibration transmission component and the air conduction component by approximating the human body. The synthesized output of the output synthesis unit 440 is supplied to the frequency analysis unit 450. The combined output of the output combining unit 33 is supplied to the signal processing control unit 470 together with the output of the vibration pickup 57 and the output of the microphone 62 whose phase has been adjusted. The operation of the signal processing control unit 470 will be described later.

  The frequency analysis unit 450 includes an FFT (Fast Fourier Transform) 451 that performs frequency analysis on the synthesized output from the output synthesis unit 440. Thereby, power spectrum data corresponding to the body sensation sound pressure in which the vibration transmission component and the air conduction component are synthesized is obtained from the FFT 451.

  Further, the frequency analysis unit 450 includes FFTs 452 and 453 for performing frequency analysis on the signal before being synthesized by the output synthesis unit 440, that is, the detection signal by the vibration pickup 57 that has passed through the phase adjustment unit 430 and the detection signal by the microphone 62, respectively. Prepare. Thereby, power spectrum data corresponding to the vibration transfer component is obtained from the FFT 452, and power spectrum data corresponding to the air conduction component is obtained from the FFT 453.

  Note that FFT 451 to 453 are set with analysis points of frequency components (power spectrum) according to the measurement frequency range of electronic device 100. For example, when the measurement frequency range of the electronic device 100 is 100 Hz to 10 kHz, the frequency component at each point obtained by equally dividing the interval in the logarithmic graph of the measurement frequency range by 100 to 2000 is set.

  Outputs of the FFTs 451 to 453 are stored in the storage unit 460. The storage unit 460 has a capacity larger than a double buffer capable of holding a plurality of pieces of analysis data (power spectrum data) obtained by the FFTs 451 to 453. The storage unit 460 can be configured to always transmit the latest data at a data transmission request timing from the PC 500 described later. Moreover, you may comprise so that the output of FFT451-453 may be input into the signal processing control part 470. FIG. The operation of the signal processing control unit 470 in that case will be described later. If the analysis is not performed in real time but is performed after recording, the double buffer configuration is not necessarily required.

  The acoustic signal output unit 480 is configured so that an external connection device such as headphones can be detachably connected. The acoustic signal output unit 480 includes any of a detection signal from the vibration pickup 57 input to the output synthesis unit 440 by the signal processing control unit 470, a detection signal from the microphone 62, or a synthesis signal from the output synthesis unit 440. Is selected and supplied. The acoustic signal output unit 480 appropriately adjusts the frequency characteristics of input data with an equalizer or the like, and then performs D / A conversion to an analog acoustic signal for output.

  Further, the signal processing unit 400 includes a test signal output unit 495. The test signal output unit 495 outputs a test signal for measuring the test sound by vibrating the panel 102 of the electronic device 100 under the control of the signal processing control unit 470. The test signal output unit 495 includes a test signal storage unit 496, a test signal generation unit 497, and an output adjustment unit 498. The test signal output unit 495 corresponds to the “signal output unit” in the present embodiment.

  The test signal storage unit 496 stores a test signal corresponding to a predetermined test sound. The predetermined test signal is, for example, a WAV file (audio data). The test signal storage unit 496 is preferably configured to selectively read a plurality of WAV files. The WAV file stored in the test signal storage unit 496 is downloaded and stored via a recording medium or a network, for example. The test signal storage unit 496 corresponds to the “storage unit” in the present embodiment.

  The test signal generation unit 497 generates a test signal corresponding to a test sound different from the test sound corresponding to the test signal stored in the test signal storage unit 496. The test signal generation unit 497 is preferably a signal corresponding to a pure tone composed of a single frequency sine wave (pure tone signal), and the frequency ranges from a low frequency to a high frequency or from a high frequency to a low frequency over a predetermined frequency range. A signal (pure tone sweep signal) corresponding to a pure tone sweep that changes sequentially and a plurality of sine wave signals with different frequencies are selectively generated. And can be output. The predetermined frequency range in the pure tone sweep signal can be set as appropriate over a wide range including the audible frequency. The amplitudes at sequential frequencies in the pure tone sweep signal are preferably the same. Also for multi-sine wave signals, the amplitude of each sine wave is preferably the same. The test signal generation unit 497 corresponds to the “generation unit” in the present embodiment.

  The output adjustment unit 498 adds a signal (cue signal) corresponding to each of the test sound start signals to the test signal output from the test signal generation unit 497 or the test signal storage unit 496, and outputs the result. FIG. 6 shows an example of a cue signal and a test signal. FIG. 6 shows a cue signal SG60 and a test signal SG62 following the cue signal SG60 with the horizontal axis as a time axis. The signal signal SG60 is a signal that can be detected in the time domain. The signal signal SG60 is, for example, a signal of one or more sounds having a predetermined sound pressure. Each signal included in the signal signal SG60 may be a pure tone having a predetermined frequency, or may be a sound composed of a plurality of pure tones having different frequencies. Moreover, the frequency of each sound may be the same or different. Further, the interval between the cue signal SG60 and the test signal SG62 and the duration of each can be set to an arbitrary length.

  The output adjustment unit 498 converts the test signal to which the cue signal is added into a predetermined signal format such as an analog signal according to the signal format of the external input of the electronic device 100 to be measured. Here, when the electronic device 100 is a mobile phone, the test signal output unit 495 may include a signal encoded according to a standard such as 3GPP (3GPP TS26.131 / 132) or VoLTE. Then, the test signal output unit 495 supplies the encoded signal to the external input terminal 105 of the electronic device 100 via the connection cable 511 for an interface such as USB. In the electronic device 100, the signal supplied to the external input terminal 105 is decoded and supplied to the piezoelectric element attached to the panel 102. Then, the piezoelectric element is driven and the panel 102 vibrates.

  Alternatively, as shown in FIG. 7, in the measurement system 200, instead of the connection cable 511, a transmission unit 511 t that encodes a cue signal output from the test signal output unit 495 and the test signal and wirelessly transmits them, and a transmission unit 511 t. A receiving unit 511r that receives and decodes the transmitted signal and supplies the decoded signal to the external input terminal 105 of the electronic device 100. In FIG. 7, the configuration other than the transmission unit 511t and the reception unit 511r is the same as that in FIG. By doing in this way, when the electronic device 100 is a mobile phone such as a smartphone, data loss due to wireless communication can be imitated, and more accurate measurement can be performed.

  The signal processing control unit 470 is connected to the PC 500 via an interface connection cable 510 such as a USB, RS-232C, SCSI, or PC card. The signal processing control unit 470 controls the operation of each unit of the signal processing unit 400 based on a command from the PC 500. The sensitivity adjustment unit 300 and the signal processing unit 400 may be configured as software executed on any suitable processor such as a CPU (central processing unit) or may be configured by a DSP (digital signal processor). it can.

  The PC 500 includes a memory 501 that stores an evaluation application of the electronic device 100 by the measurement system 10 and various data. The memory 501 may be a built-in memory or an external memory. The evaluation application is downloaded to the memory 501 via, for example, a CD-ROM or a network. For example, the PC 500 displays an application screen based on the evaluation application on the display unit 520. Further, a command is transmitted to the signal processing unit 400 based on information input via the application screen. The PC 500 receives a command response and data from the signal processing unit 400, performs predetermined processing based on the received data, and displays the measurement result on the application screen. Further, if necessary, the measurement result is output to the printer 600 and printed.

  The measurement system 10 has an aging test function, a problem reproduction function, and the like as an evaluation application of the electronic device 100. The aging test function presents a pure tone sweep test signal, repeats the process of measuring the response a specified number of times in succession, and analyzes the variation in the frequency characteristics measured during that time. The problem reproduction test confirms the similarity of the two signals of the presentation sound (test sound) and the measurement sound using the cross-correlation function, and the clip sound, temporary sound interruption, sound interruption due to wireless communication, unintentional sound The presence or absence of problems such as encoding / decoding conversion is detected.

  FIG. 8 is a diagram illustrating an example of the evaluation application screen displayed on the display unit 520. Here, for example, a test sound setting screen 700 in the aging test function is shown. This setting screen 700 is activated from the evaluation application menu of the measuring apparatus 10. The setting screen 700 includes a test sound setting unit 701, a test sound frequency setting unit 702, a test sound time length setting unit 703, a test sound amplitude setting unit 704, a measurement start icon 704, and a measurement end icon 705. The test sound setting unit 701 displays, for example, a list of pure tones, pure tone sweeps, multisine waves, and various WAV files in a pull-down format or a pop-up format, and prompts the user to select. Here, a case where a pure tone sweep is set as the test sound is shown. The test sound frequency setting unit 702 is set with an arbitrary frequency, for example, between 100 Hz and 10 KHz. Here, a sweep width of 500 Hz to 1.3 KHz is set. Further, 10 seconds is set as the test sound time length. Then, −10 dB is set as the test sound amplitude.

  When the setting of the test sound setting unit 701, the test sound frequency setting unit 702, the test sound time length setting unit 703, and the test sound amplitude setting unit 704 is completed and the test start icon 704 is operated, the PC 500 A test start command is transmitted to 400. When receiving the test start command, the signal processing unit 400 causes the test signal generation unit 495 to generate a test sound under the control of the signal processing control unit 470. In the example of FIG. 8, a test signal corresponding to a pure tone sweep is generated. The generated test signal is supplied with a cue signal by the output adjustment unit 498 and then supplied to the external input terminal 105 of the electronic device 100 to be measured held in the holding unit 70 via the connection cable 511. . Thereby, the piezoelectric element affixed on the back surface of the panel 102 of the electronic device 100 is driven, the panel 102 vibrates, and the vibration corresponding to the cue sound and the test sound is sequentially generated. Then, vibration measurement of the electronic device 100 is started.

  The signal processing unit 400 adjusts the sensitivity of the output of the vibration pickup 57 and the microphone 62 by the sensitivity adjustment unit 300, converts the output to a digital signal by the A / D conversion unit 410, and further converts the frequency characteristic by the frequency characteristic adjustment unit 420. After the adjustment, the phase is adjusted by the phase adjustment unit 430 and synthesized by the output synthesis unit 440. The output signal of the vibration pickup 57, the output signal of the microphone 62 whose phase has been adjusted, and the synthesized signal thereof are supplied to the signal processing control unit 470. On the other hand, the combined signal from the output combining unit 440, that is, the combined signal of the vibration transfer component and the air conduction component, is subjected to frequency analysis by the FFT 451 of the frequency analyzing unit 450.

  The signal processing control unit 470 detects a cue signal from the output signal of the vibration pickup 57, the output signal of the microphone 62 whose phase has been adjusted, and the combined signal thereof. For example, a pure tone signal having a constant sound pressure that can be detected in the time domain is detected as a cue signal. Then, in response to the cue signal, the signal processing control unit 470 stores the output of the FFT 451 in the storage unit 460. Then, the signal processing control unit 470 outputs the data stored in the storage unit 460 to the PC 500, and the PC 500 stores this data in the memory 501. Then, the signal processing control unit 470 terminates the storage when the preset duration of the test signal expires. The signal processing control unit 470 corresponds to a “control unit” in the present embodiment.

  Alternatively, when the cue signal is a signal that can be detected in the frequency direction, that is, when the signal is composed of one or a plurality of signals having a predetermined frequency, the signal processing control unit 470 acquires the output of the FFT 451 and acquires a predetermined frequency component. The cue signal is detected. Then, the output of the FFT 451 may be stored in the storage unit 460 in response to the detection of the cue signal.

  The measurement unit 200 repeats the above processing until the test stop icon 705 is operated. Alternatively, the setting screen 700 may be configured so that the number of repeats can be set, and the above processing may be repeated until the set number of repeats expires.

  FIG. 9 is an example of a measurement result displayed on the display unit 520 by the evaluation application of the PC 500. The example of FIG. 9 shows a comparison graph of frequency characteristics. The horizontal axis represents frequency (Hz), the vertical axis represents sound pressure (dBSPL), the broken line in the graph represents the initial frequency characteristic, and the solid line represents the frequency characteristic at the time when the fluctuation of the overall sound pressure value was the largest. The result of the aging test of the electronic device 100 is output from the printer 600 as necessary. The absolute value of the difference between the initial sound pressure level at each frequency and the sound pressure level at the time of the Nth measurement (N is one of the number of times measured from 1) is summed, and N times The graph showing the comparison between the time when the overall value is the largest and the first time may be displayed on the display unit 520 as the time when the overall sound pressure fluctuation is the largest when the summed value is the largest.

  The measurement system according to the present embodiment vibrates the electronic device 100 with a desired test signal and is transmitted by the measurement unit 200 via the ear mold unit 50 based on the outputs of the vibration detection unit 55 and the sound pressure measurement unit 60. The bone conduction sound and the air conduction sound are measured, and the electronic device 100 can be evaluated based on the measurement result. Moreover, the sound pressure level through the artificial external ear canal 53 of the ear mold 50 can be measured simultaneously with the vibration level by the sound pressure measuring unit 60. As a result, the audibility level obtained by combining the vibration level corresponding to the vibration transmission amount to the human ear and the sound pressure level corresponding to the air conduction sound can be measured, so that the electronic device 100 can be evaluated in more detail. It becomes. Furthermore, since the holding unit 70 can change the pressing force of the electronic device 100 against the ear-shaped portion 50 and can also change the contact posture, the electronic device 100 can be evaluated in various modes. Therefore, the electronic device 100 can be correctly evaluated, and the specification management of the electronic device 100 is facilitated.

  In the measurement system according to the present embodiment, the test signal storage unit 496 stores test sounds such as WAV files as minimum sound source information, and the test signal generation unit 497 stores pure tones, pure tone sweeps, and multisine waves. Etc., so that memory resources can be saved.

  Furthermore, when the electronic device 100 is a mobile phone such as a smartphone, by configuring the test signal to be supplied to the electronic device 100 by wireless communication, data loss due to wireless communication can be simulated, More accurate measurement is possible.

  However, in the case of wireless communication, when compared with a loopback in which a test signal is input to the electronic device 100 via the connection cable 511, processing such as encoding processing by the transmission unit 511t, detection processing and decoding processing by the reception unit 511r is performed. As a result, a difference occurs in the time until the test sound is reproduced by the electronic device 100 to be measured. Then, it becomes difficult for the signal processing control unit 470 to start storing and measuring the test signal in synchronization with the start of reproduction of the test signal. In that regard, according to the present embodiment, the cue signal is added before the test signal, and the memory is started after the cue signal is detected, so the test signal is stored in synchronization with the start of the reproduction of the test signal, It becomes easy to start measurement, the processing load of the signal processing control unit 470 can be reduced, and the storage area of the storage unit 460 can be used effectively.

  FIG. 10 is a modification of the main part of the measurement system 100. The measurement system 100 is different from the configuration of FIG. 7 in that the PC 500 includes a test signal output unit 495 instead of the signal processing unit 400 in the configuration shown in FIG. In the configuration of FIG. 10, when the test sound is set on the setting screen 700 in the PC 500, the test signal output unit 450 responds to the test signal stored in the test signal storage unit 496 or generates a test signal. The test signal generated by the unit 497 is output. Other parts are the same as those in FIG.

  FIG. 11 is a diagram illustrating a schematic configuration of a main part of a measurement system in a measurement system having a different configuration. In the measurement system 110 according to the present embodiment, the configuration of the electronic device mounting unit 120 is different from that of the electronic device mounting unit 20 in FIG. 1, and the other configurations are the same as those in FIG. Therefore, in FIG. 11, the measurement unit 200 shown in FIG. 1 is not shown. The electronic device mounting unit 120 includes a human head model 130 and a holding unit 150 that holds the electronic device 100 to be measured. The head model 130 is made of, for example, HATS or KEMAR. The artificial ear 131 of the head model 130 is detachable from the head model 130.

  The artificial ear 131 constitutes an ear mold part, and as shown in FIG. 12 (a), a side view removed from the head model 130, an ear model 132 similar to the ear mold part 50 of FIG. And an artificial external ear canal part 134 coupled to the ear model 132 and having an artificial external auditory canal 133 formed thereon. In the artificial external ear canal unit 134, a vibration detection unit 135 including a vibration detection element is disposed around the opening of the artificial external ear canal 133, similarly to the ear mold unit 50 of FIG. 1. In addition, a sound pressure measuring unit 136 having a microphone at the center is arranged on the mounting portion of the artificial ear 131 of the head model 130 as shown in a side view with the artificial ear 131 removed in FIG. Yes. The sound pressure measuring unit 136 is arranged so as to measure the sound pressure of the sound propagated through the artificial external ear canal 133 of the artificial ear 131 when the artificial ear 131 is attached to the head model 130. Note that the sound pressure measurement unit 136 may be disposed on the artificial ear 131 side in the same manner as the ear mold unit 50 of FIG. The vibration detection element constituting the vibration detection unit 135 and the microphone constituting the sound pressure measurement unit 136 are connected to the measurement unit as in FIG.

  The holding unit 150 is detachably attached to the head model 130, and includes a head fixing unit 151 to the head model 130, a support unit 152 that supports the electronic device 100 to be measured, and a head fixing unit 151. And a multi-joint arm portion 153 for connecting the support portion 152. The holding unit 150 is configured to be able to adjust the pressing force and the contact posture with respect to the artificial ear 131 of the electronic device 100 supported by the support unit 152 through the articulated arm unit 153 in the same manner as the holding unit 70 of FIG. ing.

  In addition, this invention is not limited only to the said embodiment, Many deformation | transformation or a change is possible. For example, the function of the evaluation application executed by the PC 500 may be installed in the signal processing unit 400 and the PC 500 may be omitted. Furthermore, the measuring unit 200 is not limited to a stand-alone configuration that aggregates all functions, but has a configuration that utilizes a network system or a cloud, such as a case where the measurement unit 200 is divided into one or a plurality of PCs or external servers. Needless to say, it may be.

  In the above embodiment, the electronic device 100 to be measured is assumed to be a mobile phone such as a smartphone and the panel 102 vibrates as a vibrating body. An electronic device in which a panel in contact with the screen vibrates can be similarly evaluated. Moreover, not only a mobile phone but other piezoelectric receivers can be evaluated in the same manner. Further, depending on the characteristics measured by the vibrating body, such as measuring the direct vibration of the vibrating body, the ear mold portion 50 and the sound pressure measuring portion 60 can be omitted.

DESCRIPTION OF SYMBOLS 10 Measurement system 55 Vibration detection part 56 Vibration detection element 100 Electronic device 101 Case 102 Panel (vibration body)
DESCRIPTION OF SYMBOLS 103 Memory 110 Measurement system 135 Vibration detection part 136 Sound pressure measurement part 400 Signal processing part 495 Test signal output part 496 Test signal memory | storage part 497 Test signal generation part 500 PC
510,511 Connection cable

Claims (6)

A measurement system that evaluates the electronic equipment transmitting the sound by the vibration transmitted by pressing a vibration motion to the body of the ear to the user,
An ear model including an ear model imitating a human ear and an artificial external ear canal coupled to the ear model;
A vibration detection unit for detecting vibration transmitted to the ear mold unit;
A microphone disposed on an end surface of the artificial external ear canal portion opposite to the ear model;
A storage unit for storing a first test signal corresponding to a predetermined test sound;
A generator for generating a second test signal corresponding to a test sound different from the predetermined test sound;
A control unit,
The control unit detects the vibration of the vibrating body that vibrates in accordance with the first test signal or the second test signal by the vibration detection unit, and uses the microphone to obtain a sound pressure that has passed through the artificial external ear canal unit. Measuring system to detect . In claim 1,
Before SL to a first test signal or the second test signal, El pressurizing a signal corresponding to each of the test tone start cue tones, the measurement system. In claim 2,
The said control part is a measurement system which starts the memory | storage of the detection result of the said vibration transmitted to the said ear-shaped part, when detecting the signal sound of each said test sound start . In any one of Claims 1 thru | or 3,
A transmitter for wirelessly transmitting the first or second test signal;
A receiving unit that will receive the first or second test signal wirelessly transmitted,
Further comprising a measurement system. In any one of Claims 1 thru | or 4,
The first test signal is a test signal corresponding to a sound included in the WAV file,
The measurement system, wherein the second test signal is a test signal corresponding to a pure tone or a sound based on a pure tone. An ear model including an ear model imitating a human ear and an artificial external ear canal coupled to the ear model;
A vibration detection unit for detecting vibration transmitted to the ear mold unit;
Using a measuring system and a microphone disposed on the end face of the artificial ear path unit opposite to the said ear model, electronic equipment for transmitting sound by the vibration transmitted by pressing a vibration motion to the body of the ear to the user a Assess measurement methods,
The first test signal read from the storage unit that stores the first test signal corresponding to the predetermined test sound or the second test signal corresponding to the test sound different from the predetermined test sound is generated. Outputting the second test signal generated by the generation unit;
Adding to the first test signal or the second test signal a signal corresponding to a start sound of each test sound;
Oscillating the vibrating body according to the first test signal or the second test signal;
Detecting the vibration based on the first test signal or the second test signal with the vibration detecting unit when detecting the signal sound of the start of each test sound ;
Detecting the sound pressure through the artificial external ear canal portion with the microphone;
Measuring method.

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