Hearing test equipment

Abstract

To provide a technology to execute a hearing acuity examination accurately while avoiding false recognition and an operation mistake of an examiner.SOLUTION: A silent position M3 in which presentation of masking noises is not executed is provided next to a position M2 of a minimum output sound of a sub-channel dial 32. A state in which masking noises are not displayed at all can be attained by adjusting the sub-channel dial 32 to the silent position M3. The state in which masking noises are not presented at all by turning down the sub-channel dial 32 to the minimum by providing the silent position M3 (OFF) explicitly next to the position M2 of the minimum output sound of the sub-channel dial 32 can be attained so that it is possible to eliminate a procedure to set the masking noises to be silent with another switch.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a hearing test device. [Background technology]

[0002] The hearing test method published by the Japan Audiological Society requires the use of a properly calibrated hearing test device (audiometer) that meets standards such as JIS T 1201-1. This hearing test method also requires that the hearing test be conducted first with the masking noise muted, but if the difference in threshold levels between the left and right ears is close to the interaural attenuation, a measurement method that masks the non-test ear is required for the ear with poorer hearing.

[0003] Prior art relating to hearing test devices and masking is known from, for example, Patent Document 1 and Patent Document 2. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-117545 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-61938 Summary of the Invention [Problem to be solved by the invention]

[0005] In conventional hearing test devices, the sub-channel dial (masking dial) and the masking switch (the switch that turns the masking function on and off) are located in separate locations, which means that hearing tests can sometimes be conducted without silencing the masking noise.

[0006] In this case, even if the sub-channel dial is turned down to the minimum value, a very low volume of masking noise is actually being output. It is possible that a person with hearing loss may not be able to hear (perceive) this low volume of masking noise, but this is not an accurate measurement method. Furthermore, such misperceptions or operational errors may result in an inaccurate hearing test.

[0007] Therefore, an object of the present invention is to provide a technology that can avoid misunderstandings and operational errors by the tester and enable accurate hearing tests. [Means for solving the problem]

[0008] The present invention employs the following solutions to solve the above problems. Note that the following solutions are merely examples, and the present invention is not limited to these.

[0009] Solution 1: The hearing test device of this solution is a hearing test device that can output sounds related to a hearing test using a first channel and a second channel, and is equipped with a first adjustment means that can adjust the volume of the first channel, and a second adjustment means that is provided separately from the first adjustment means, can adjust the volume of the second channel, and can set the volume of the second channel to mute.

[0010] According to this solution, the second adjustment means has a function of setting the volume of the second channel to silent, so that the volume can be set to silent simply by operating the second channel (second adjustment means), thereby improving operability.

[0011] Solution 2: The hearing test device of this solution is a hearing test device characterized in that, in any of the solutions described above, the second adjustment means is a dial arranged in order from the maximum output sound position to the minimum output sound position, with a silent position located next to the minimum output sound position, and the volume of the second channel is set to silent in response to the dial being adjusted to the silent position.

[0012] According to this solution, the tester can check by looking at the second adjustment means that the volume of the second channel is muted, which prevents misunderstandings and operational errors on the part of the tester and allows for accurate hearing tests. Furthermore, according to this solution, the volume of the second channel can be set to muted by a simple operation of simply turning the dial to the muted position, improving operability.

[0013] Solution 3: The hearing test device of this solution is a hearing test device characterized in that, in any of the solutions described above, the second adjustment means is a dial that can be pressed, and the volume of the second channel is set to mute in response to the dial being pressed.

[0014] According to this solution, the volume of the second channel can be set to mute by the simple action of simply pressing the dial, thereby improving operability.

[0015] Solution 4: The hearing test device of this solution is a hearing test device characterized in that, in any of the solutions described above, the second adjustment means is a dial that can be slid, and the volume of the second channel is set to mute in response to the sliding operation of the dial.

[0016] According to this solution, the volume of the second channel can be set to mute by a simple operation of sliding the dial, thereby improving operability.

[0017] Solution 5: The hearing test device of this solution is a hearing test device characterized in that, in any of the solutions described above, the sound output using the first channel is a test sound output to one ear of the person undergoing the hearing test, and the sound output using the second channel is a masking noise output to the other ear of the person undergoing the hearing test.

[0018] According to this solution, the test sound is output using the first channel and the masking noise is output using the second channel, so that the masking noise can be completely muted depending on the test situation, enabling accurate hearing tests. [Effects of the Invention]

[0019] According to the present invention, it is possible to avoid misunderstandings and operational errors by the examiner and to perform a hearing test accurately. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a perspective view showing a hearing test apparatus 100 of a first embodiment. [Figure 2] 2 is an enlarged plan view showing an operation unit 30 according to the first embodiment. FIG. [Figure 3] FIG. 2 is an enlarged view of a sub-channel dial 32 according to the first embodiment. [Figure 4] 1 is a block diagram showing the electrical configuration of a hearing test apparatus 100 according to a first embodiment. [Figure 5] 10 is a table showing examples of interaural transition attenuation. [Figure 6] FIG. 10 is a diagram showing a sub-channel dial 32-2 in the second embodiment. [Figure 7] FIG. 10 is a diagram showing a sub-channel dial 32-3 in the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0021] [First embodiment] A first embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a perspective view showing a hearing test device 100 of the first embodiment. Fig. 2 is a plan view showing an enlarged view of an operation unit 30 of the first embodiment. Fig. 3 is a view showing an enlarged view of a sub-channel dial 32 of the first embodiment. 1, the hearing test device 100 of the first embodiment includes a liquid crystal display 10, a built-in printer 20, and an operation unit 30. The hearing test device 100 is a device capable of outputting sounds related to a hearing test using a main channel (first channel) and a sub-channel (second channel).

[0022] The hearing test device 100 can perform a hearing test using two channels, a main channel and a sub-channel, simultaneously, or can perform a hearing test using only the main channel. A hearing test is performed by connecting a handset (not shown) to the hearing test device 100. For example, in the case of a binaural air conduction handset, the main channel sound can be output to the left ear of the handset and the sub-channel sound can be output to the right ear of the handset. Conversely, the sub-channel sound can be output to the left ear of the handset and the main channel sound can be output to the right ear of the handset. Alternatively, in the case of a monoaural bone conduction handset and a monoaural masking handset, the main channel test sound can be output to the bone conduction handset and the sub-channel masking noise can be output to the masking handset. In this case, the bone conduction handset can be worn so that its bone conduction vibrator contacts the mastoid of one ear or the mid-forehead, depending on the test method. Furthermore, in the case of a sound field test, a speaker (not shown) is connected to the hearing test device 100 to perform the hearing test. In this mode, the test sound of the main channel can be output to the speaker, and the masking noise of the sub-channel can be output to a masking receiver for one ear.

[0023] The liquid crystal display 10 is a device that displays information related to the hearing test. The built-in printer 20 is a device that prints information related to the hearing test on paper or the like. The operation unit 30 is a part that operates the hearing test device 100.

[0024] As shown in Fig. 2, the operation unit 30 includes a main channel dial 31 (first adjustment means), a sub-channel dial 32 (second adjustment means), a masking switch 33, a main interrupter 34, and a sub-interrupter 35. The main channel dial 31 and the sub-channel dial 32 are provided as separate dials. The operation unit 30 also includes other members (buttons, dials, LEDs, etc.), but detailed description thereof will be omitted. To improve operability, the main interrupter 34 is provided in two locations: at a position below and to the right of the main channel dial 31 and at a position below and to the right of the sub-channel dial 32.

[0025] The main channel dial 31 is a disk-shaped rotating body located on the lower left side of the operation unit 30, and is capable of adjusting the volume of the main channel (the output level of the test sound). A first volume designation section 31a is formed on the top of the main channel dial 31, and the volume of the main channel can be adjusted by aligning the scale of the main channel dial 31 with the center line extending vertically of the first volume designation section 31a.

[0026] The scale of the main channel dial 31 corresponds to a range of -20 to 110 dBHL. Within this range, a thick line and a number are displayed every 5 dBHL, and a thin line is displayed every 1 dBHL. Note that "dBHL" is a unit that indicates how much higher or lower a hearing level is compared to a reference hearing level, so even if the setting is "0 dBHL" or "-20 dBHL," a test sound corresponding to that hearing level will be output.

[0027] In the example of Figure 2, the -20 dBHL marking on the main channel dial 31 is aligned with the center line extending vertically of the first volume designation section 31a, so the volume of the main channel is set to the test sound corresponding to -20 dBHL. Note that the unit of "hearing level" in the figure is shown as "dB" only, omitting "HL" (the same applies to the sub-channels).

[0028] The sub-channel dial 32 is a disk-shaped rotating body located on the lower right side of the operation unit 30, and can adjust the volume (masking level) of the sub-channel, and can also set the volume of the sub-channel to mute (off, no presentation, muted sound presentation). Here, muting the volume means setting the corresponding switch or dial to off, and presenting the volume means setting the corresponding switch or dial to on. A second volume designation section 32a is formed on the top of the sub-channel dial 32, and the volume of the sub-channel can be adjusted by aligning the scale of the sub-channel dial 32 with the center line extending vertically of the second volume designation section 32a.

[0029] The scale of the sub-channel dial 32 corresponds to a range of -10 to 110 dBHL. Within this range, numbers are displayed for every 5 dBHL. Also, a silent position (OFF position) is set to the right of the -10 dBHL marking. This point will be described in detail later.

[0030] In the example of Figure 2, the -10dBHL number on the sub-channel dial 32 is aligned with the center line extending in the vertical direction of the second volume designation section 32a, so the volume of the sub-channel is set to a masking level corresponding to -10dBHL.

[0031] The masking switch 33 is a switch that switches between presenting and not presenting masking noise for the sub-channel. When the masking switch 33 is pressed once while the masking noise is not being presented, the masking noise is presented. When the masking switch 33 is pressed once while the masking noise is being presented, the masking noise is not presented.

[0032] The main interrupter 34 is a switch that turns the test sound of the main channel on or off. When the main interrupter 34 is pressed while the test sound is being presented, the test sound is not presented while the main interrupter 34 is pressed, regardless of the position of the main channel dial 31. Alternatively, depending on the device settings, when the main interrupter 34 is pressed while the test sound is not being presented, the test sound corresponding to the position of the main channel dial 31 may be presented while the main interrupter is pressed.

[0033] The sub-interrupter 35 is a switch that turns the masking noise of the sub-channel on or off. If the sub-interrupter 35 is pressed while the masking noise is being presented, the masking noise will not be presented while the sub-interrupter 35 is pressed, regardless of the position of the sub-channel dial 32. Alternatively, depending on the device settings, if the sub-interrupter 35 is pressed while the masking noise is not being presented, the masking noise according to the position of the sub-channel dial 32 may be presented while the sub-interrupter 35 is pressed.

[0034] [Details on silent position] As shown in FIG. 3, the sub-channel dial 32 is a dial in which the positions from a maximum output sound position M1 (110 dBHL) to a minimum output sound position M2 (-10 dBHL) are arranged in 5 dBHL increments, with a silent position M3 (OFF) located immediately to the right of the minimum output sound position M2.

[0035] That is, when the output volume is determined by the position of the sub-channel dial 32, as in the hearing test device 100 of the first embodiment, another scale step is provided next to the minimum output sound position M2 (-10 dBHL), and this position is designated as the silent position M3 (the position where masking noise is turned off).

[0036] When the sub-channel dial 32 is continuously rotated clockwise, it stops when the maximum output sound position M1 (110 dBHL) reaches a position corresponding to the second volume designation section 32a. When the sub-channel dial 32 is continuously rotated counterclockwise, it stops when the silent position M3 (OFF) reaches a position corresponding to the second volume designation section 32a. Similarly, the main channel dial 31 employs a mechanism that stops its rotation at the maximum output sound position and the minimum output sound position.

[0037] FIG. 4 is a block diagram showing the electrical configuration of the hearing test apparatus 100 of the first embodiment. The hearing test device 100 comprises a liquid crystal display 10, a built-in printer 20, an operation unit 30, an input / output unit 40, and a control unit 50.

[0038] The liquid crystal display 10 and the built-in printer 20 are the devices described above. The operation unit 30 includes a main channel dial 31, a sub-channel dial 32, a masking switch 33, a main interrupter 34, a sub-interrupter 35, and other members 36. The other members 36 include buttons, dials, LEDs, etc. other than the main channel dial 31, the sub-channel dial 32, the masking switch 33, the main interrupter 34, and the sub-interrupter 35. The other members 36 include, for example, a start / stop button, a main channel level display device, a sub-channel level display device, a print button, a cancel button, various switching buttons, various environment setting buttons, various environment setting dials, various LEDs, etc.

[0039] The dials and buttons included in the main channel dial 31, sub-channel dial 32, masking switch 33, main interrupter 34, sub-interrupter 35 and other components 36 transmit operation information (such as interrupter detection information) to the control unit 50 depending on the operation status.

[0040] The input / output unit 40 has a plurality of terminals, and a receiver or the like corresponding to each terminal can be connected to the terminal. For example, the input / output unit 40 outputs sound signals related to the main channel and the sub-channel to the receiver. In addition, the terminals of the input / output unit 40 can be connected to operation members (response system, response button) operated by the subject during the hearing test, and operation information of the operation members is transmitted to the control unit 50.

[0041] The control unit 50 is connected to the liquid crystal display 10, the built-in printer 20, the operation unit 30, and the input / output unit 40, and controls each of these devices and units. Specifically, the control unit 50 receives operation information from the operation unit 30, and based on the operation information, instructs the liquid crystal display 10 to display the necessary information, instructs the built-in printer 20 to print the necessary information, instructs the operation unit 30 to turn on / off an LED, and instructs the input / output unit 40 to output the necessary sound data.

[0042] The control unit 50 also controls the sound output using the main channel and the sound output using the sub-channel. The sound output using the main channel can be a test sound output to one ear of the person undergoing the hearing test. The sound output using the sub-channel can be a masking noise output to the other ear of the person undergoing the hearing test.

[0043] The control unit 50 sets the volume of the main channel to a designated sound in response to the main channel dial 31 being set to a position corresponding to each hearing level. The control unit 50 also sets the masking level of the sub-channel to a designated sound in response to the sub-channel dial 32 being set to a position corresponding to each hearing level. Furthermore, the control unit 50 sets the masking level of the sub-channel to silent in response to the sub-channel dial 32 being set to the silent position (second adjustment means). In this way, in this embodiment, the sub-channel dial 32 of the hearing test device 100 has the function of setting the masking noise to silent. Furthermore, the control unit 50 can switch between a state where the masking noise is presented and a state where the masking noise is not presented in response to operation information from the masking switch 33.

[0044] Figure 5 is a table showing examples of interaural attenuation. Figure 5(A) shows the interaural attenuation of an air conduction receiver, and Figure 5(B) shows the interaural attenuation of a bone conduction receiver (when attached to the mastoid). This table is taken from the book "Practical Hearing Tests, 4th Revised Edition."

[0045] For example, in pure-tone air conduction audiometry, if the threshold response between the subject's two ears occurs at a hearing level difference close to the interaural attenuation of the air conduction receiver, a measurement method that masks the non-test ear is required for the ear with poorer hearing. In other words, if the difference in hearing level between the subject's two ears is equal to or greater than the interaural attenuation shown in Figure 5, the hearing test must be performed with masking. Interaural attenuation is the sound pressure attenuated when sound presented to one ear reaches the inner ear on the other side. For example, it is said to be the value shown in Figure 5, but this is not an absolute value, and the amount of attenuation differs for each individual and for each frequency.

[0046] More specifically, for example, if a subject's left ear has an air conduction hearing threshold of 30 dBHL at 1 kHz and his right ear has an air conduction hearing threshold of 95 dBHL at 1 kHz, the right ear has worse hearing than the left ear. In this case, the difference in hearing level between the subject's two ears is 95 dBHL (right ear) - 30 dBHL (left ear) = 65 dB. This difference in hearing level, "65 dB," is greater than the "60 dB" interaural attenuation of the air conduction receiver at 1 kHz (1000 Hz) in Figure 5(A). Therefore, when performing a hearing test for the right ear, a masking noise is output to the left ear while a test sound is output to the right ear. In addition to these situations, there are also cases where the non-test ear is masked in order to measure the bone conduction hearing (threshold) level for each ear in bone conduction pure tone audiometry.

[0047] Comparison of the hearing test device of the first embodiment with existing hearing test devices In the hearing test device 100 of the first embodiment, the masking level is determined by the position of the sub-channel dial 32. Therefore, when masking is performed during hearing measurement, the masking switch 33 of the hearing test device 100 is first switched to a state in which masking noise can be presented.

[0048] Next, the masking level is calculated taking into consideration the test sound level to be presented and the hearing level of the subject, and set to that level by rotating the sub-channel dial 32. If necessary, the test is performed by setting the masking noise level appropriate for each frequency. In existing hearing test devices, once the test is completed, the sub-channel dial is turned to the minimum position to lower the volume, and the masking switch is switched to a state where no masking noise is presented. However, with existing hearing test equipment, simply setting the sub-channel dial to the minimum position does not completely eliminate the masking noise, and a very small amount of masking noise, for example -10 dBHL, continues to be presented.

[0049] On the other hand, in the hearing test device 100 of this embodiment, a silent position M3 where no masking noise is presented is provided next to the minimum output sound position M2 of the sub-channel dial 32, so that by aligning the sub-channel dial 32 with the silent position M3, it is possible to completely prevent the presentation of masking noise.

[0050] In particular, in the case of this embodiment, by explicitly providing a silent position M3 (OFF) next to the minimum output sound position M2 of the sub-channel dial 32, it is possible to completely silence the masking noise by turning the sub-channel dial 32 to its minimum position, thereby reducing the procedure of setting the masking noise to silent using a separate switch (e.g., masking switch 33).

[0051] In addition, the tester will be able to visually confirm that there is no masking noise, which will help to avoid the mistaken belief that there is no masking noise at the minimum output sound position M2, which is -10 dBHL (or 0 dBHL depending on the model), and will enable the provision of more accurate hearing test results.

[0052] As described above, the first embodiment has the following advantages. (1) According to the first embodiment, it is possible to mute the masking noise or adjust the volume of the masking noise simply by operating the sub-channel dial 32. In other words, it is possible to both turn the masking noise on and off and adjust the volume by operating the dial with one hand, thereby improving the operability of the hearing testing device 100.

[0053] (2) According to the first embodiment, the sub-channel dial 32 has a function for setting the volume of the sub-channel to silent. Therefore, the volume can be set to silent simply by operating the sub-channel dial 32, thereby improving operability.

[0054] (3) According to the first embodiment, the tester can confirm that the volume of the sub-channel is muted by looking at the sub-channel dial 32, which prevents misunderstandings and operational errors on the part of the tester and allows for accurate hearing tests. Furthermore, according to the first embodiment, the volume of the sub-channel can be set to muted by a simple operation of simply setting the sub-channel dial 32 to the muted position, thereby improving operability.

[0055] (4) According to the first embodiment, the test sound is output using the main channel and the masking noise is output using the sub-channel, so that the masking noise can be completely muted depending on the test situation, enabling accurate hearing tests.

[0056] Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. In the following description, the same content as in the first embodiment will be omitted. FIG. 6 is a diagram showing the sub-channel dial 32-2 of the second embodiment. The main difference between the first and second embodiments is that the sub-channel dial 32-2 (second adjustment means) is changed to a dial that can be pressed (has a push switch function).

[0057] As shown in Figure 6(A), the sub-channel dial 32-2 can be, for example, an infinitely rotating rotary encoder. In this case, the shaft of the encoder serves as a push switch, and pressing the sub-channel dial 32-2 sets whether or not to present the masking noise of the sub-channel. In response to the pressing operation of the sub-channel dial 32-2, the control unit sets the volume of the sub-channel to mute regardless of the position of the sub-channel dial 32. Alternatively, the control unit changes the volume of the sub-channel from mute to outputting a masking noise according to the position of the sub-channel dial 32.

[0058] The push switch section may be of an alternate type (which alternates between "ON" and "OFF" states each time the switch button is pressed) or a momentary type (which remains "ON" or "OFF" only while the switch is pressed). In the case of a momentary type, the function is the same as pressing the sub-interrupter 35.

[0059] When an infinitely rotating rotary encoder is used for the sub-channel dial 32-2, rotating the sub-channel dial 32-2 to the right increases the volume, and rotating it to the left decreases the volume. For this reason, as shown in Figure 6(B), the sub-channel dial 32-2 does not have a scale like in the first embodiment, but can instead display arrow information indicating the direction of volume increase and decrease. The volume can be adjusted by looking at the volume display on the LCD display or a meter on the operation panel, for example. As with the first embodiment, the second embodiment can also be applied to a dial in which the masking level is determined by the position of the sub-channel dial 32. The other configurations are the same as those of the first embodiment.

[0060] Thus, according to the second embodiment, in addition to the effects of the first embodiment, the volume of the sub-channel can be set to mute by the simple action of simply pressing the sub-channel dial 32, thereby improving operability. Furthermore, according to the second embodiment, instead of gradually reducing the volume and finally making it silent as in the first embodiment, it is possible to transition directly from any volume to silence by pressing the sub-channel dial 32.

[0061] Third Embodiment Next, a third embodiment of the present invention will be described with reference to the drawings. In the following description, the same content as in the first embodiment will be omitted. FIG. 7 is a diagram showing the sub-channel dial 32-3 of the third embodiment. The main difference between the first and third embodiments is that the sub-channel dial 32-3 (second adjustment means) is changed to a dial that can be slid (has a slide switch function).

[0062] As shown in FIG. 7A, the sub-channel dial 32-3 has, for example, an encoder shaft that serves as a slide switch, and the position of the slide switch determines whether or not the test sound of the sub-channel is presented. The control unit sets the volume of the sub-channel to mute by, for example, moving the sub-channel dial 32-3 itself downward, regardless of the position of the sub-channel dial 32. Alternatively, the control unit outputs a masking noise according to the position of the sub-channel dial 32 from mute. The slide switch section may be of either an alternate type or a momentary type. If it is of the momentary type, it has the same function as pressing the sub-interrupter 35.

[0063] 7(B), the sub-channel dial 32-3 may be slidable left and right, or may be slidable diagonally. The configuration of the third embodiment can be applied to cases where the masking level is determined by the position of a dial, as in the first embodiment, and to cases where the masking level is changed by an infinitely rotating rotary encoder, as in the second embodiment. The other configurations are the same as those of the first embodiment.

[0064] The sub-channel dial 32-3 of the third embodiment can set the volume of the sub-channel to silent by sliding, and therefore does not have a silent position M3 (OFF) as in the first embodiment. However, by providing the silent position M3 as in the first embodiment, it may be possible to set the volume of the masking noise to silent by either sliding or rotating.

[0065] Thus, according to the third embodiment, in addition to the effects of the first embodiment, the volume of the second channel can be set to mute by the simple action of sliding the sub-channel dial 32, thereby improving operability. Furthermore, according to the third embodiment, instead of gradually reducing the volume and finally making it silent as in the first embodiment, it is possible to transition directly from any volume to silence by sliding the sub-channel dial 32.

[0066] The present invention is not limited to the above-described embodiments, and can be practiced in various modified forms. (1) The first and second adjustment means have been described as dials, but they may be mechanisms with slide knobs or mechanisms with plus and minus buttons. (2) In the case of an embodiment using an encoder (infinite rotation mechanism), the output sound pressure can be set by moving the encoder while checking the display on the screen of the hearing tester. In this case, a silent position (OFF / silent setting position) can be set at a position lower than the lowest output sound pressure displayed on the screen of the hearing tester.

[0067] (3) The first and second channels can be interchanged. In this case, for example, the first channel can be the sub-channel and the second channel can be the main channel. (4) The sound output using the first channel may be a sound other than the test sound. (5) The sound output using the second channel may be a sound other than masking noise.

[0068] (6) In each of the above-described embodiments, the masking noise can be muted using the sub-channel dial, so there is no need to provide the masking switch 33. If the masking switch 33 is not provided, the sub-channel dial 32 serves both as an ON / OFF switch for the masking noise and as a volume adjuster for the masking noise. However, by leaving the masking switch 33 and providing both the sub-channel dial 32 and the masking switch 33 with the function of silencing the masking noise, the range of muting operations can be expanded and usability can be improved. [Explanation of symbols]

[0069] 10 LCD display 20 Built-in printer 30 Control section 31 Main Channel Dial 31a 1st volume specification section 32 Sub-channel dial 32-2 Sub-channel dial 32-3 Sub-channel dial 32a 2nd volume designation section 33 Masking Switch 34 Main Interrupter 35 Sub-interrupter 36 Other materials 40 Input / output section 50 control section 100 Hearing test equipment M1 Maximum output sound position M2 Minimum output sound position M3 Silence position

Claims

1. A hearing test device capable of outputting sounds related to a hearing test using a first channel and a second channel, a first adjusting means for adjusting the volume of the first channel; a second adjusting means provided separately from the first adjusting means, capable of adjusting the volume of the second channel and setting the volume of the second channel to mute; A hearing testing device comprising:

2. 2. The hearing test apparatus according to claim 1, the second adjustment means is a dial on which positions from a maximum output sound position to a minimum output sound position are arranged in order, with a silent position arranged next to the minimum output sound position, and the volume of the second channel is set to silent when the dial is set to the silent position.

3. 2. The hearing test apparatus according to claim 1, The hearing test device is characterized in that the second adjustment means is a dial that can be pressed, and the volume of the second channel is set to mute in response to the pressing of the dial.

4. 2. The hearing test apparatus according to claim 1, The hearing test device is characterized in that the second adjustment means is a dial that can be slid, and the volume of the second channel is set to mute in response to the sliding operation of the dial.

5. 5. The hearing test apparatus according to claim 1, the sound output using the first channel is a test sound output to one ear of a person undergoing a hearing test; 10. A hearing test apparatus, wherein the sound output using the second channel is a masking noise output to the other ear of a person undergoing a hearing test.

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