JP5045366B2 - Volume control device, program, and volume control method - Google Patents

Description

  The present invention relates to a volume control device that outputs an input audio signal by giving a gain of an adjustable volume value, a program that causes a computer to function as control means in the volume control device, and a volume control method in the volume control device About.

  Conventionally, the adjustment of the output volume in an audio device or the like is performed by an element capable of adjusting the output volume, such as an electronic volume or a DSP (digital signal processor).

  In addition, as a technique for adjusting the output volume as described above, Patent Document 1 discloses that each time a high level or low level voltage is applied via an I / O port based on a volume operation key operation by a user, A sound output unit that outputs a volume change signal for changing the volume in stages is disclosed.

  However, when the output volume is controlled only by the electronic volume, the DSP or the like as described above, the volume can be increased only to a certain level, and the maximum output may be insufficient.

  In addition, in the output volume adjustment element that can control the output volume according to the magnitude of the applied voltage and the control value to be applied, if a large voltage is applied from the beginning to increase the maximum output, the noise is correspondingly increased. There is also a problem of increasing.

  Therefore, as a technique for solving these inconveniences, when the output volume is controlled using such an output volume adjustment element, the output volume is changed by switching the applied voltage and changing the volume value by applying a control value. A technique for controlling the above has been proposed. In this technique, when the change of the volume value by giving the control value according to the user operation exceeds or exceeds the predetermined boundary value, the applied voltage to the output volume adjustment element is increased. Is switched to a voltage that is one step higher or lower, and the volume value is changed by adjusting the amount of change that has increased or decreased excessively by applying a control value.

  FIG. 6 shows the change in volume value by this technique. Up to −10 [dB], the volume value is adjusted by 1 [dB] by only applying the control value. However, when the volume value is further adjusted to exceed −10 [dB] at time t1, the applied voltage And a control value for canceling out 4 [dB] of 5 [dB] that changes due to this switching is given to obtain a change of 1 [dB].

At this time, the switching of the applied voltage is immediately reflected in the volume value. However, in the case of a change in the volume value due to the application of the control value, the time until the control value is transmitted to the output volume adjustment element and the applied control Since it takes time for the output volume adjustment element to change the volume value according to the value, it takes some time before the control value is reflected in the volume value. Therefore, as shown in the figure, at time t1, only a change in volume value due to switching of the applied voltage appears, and thereafter, the volume value changes so as to follow the control value, and the target 1 [ [dB] change in volume value is achieved.
JP 2007-005954 A

  However, according to the prior art of FIG. 6, there is a problem that when the volume value is changed by simultaneously switching the applied voltage and applying the control value, the volume value changes greatly.

  An object of the present invention is to provide a volume control device using a volume control element that can control an output volume according to the magnitude of a voltage to be applied and a control value to be applied. Is to solve the problem of once changing significantly.

In order to achieve this object, the sound volume control device of the present invention has a first mode by giving a control value for controlling a sound volume value , and the speed at which the same amount of gain is changed is faster than the gain change by the first mode. The volume value can be quickly changed by the second mode by switching the applied voltage, and the volume value is output by giving a gain of the volume value to the input audio signal, and the volume value in the volume level adjustment element And a control means for giving a control value of the volume value according to the operation of the operation means to the volume adjustment element, the control means according to the operation of the operation means When the change of the volume value due to the application of the control value exceeds the predetermined boundary value and increases the volume value, the change amount of the volume value to be changed by the first mode is determined from the control value at that time. Subtract A control value is applied to start the decrease of the volume value by the first mode, and when the reduction of half of the change amount is completed, the volume value is increased by the second mode, and according to the operation of the operation means If the change of the volume value by the addition of the control value exceeds the predetermined boundary value and decreases the volume value, the change amount of the volume value to be changed by the first mode from the control value at that time Is added to start the increase of the volume value by the first mode, and when the increase of half of the change amount is completed, the volume value is decreased by the second mode, The volume adjustment element reduces the volume value for the remaining half of the change amount after the volume value is increased by the second mode, and after the decrease of the volume value by the second mode is performed for the remaining half of the change amount. Increase the volume value

Another volume control device according to the present invention includes a first mode in which a control value for controlling a volume value is applied , and a speed of changing the same amount of gain is faster than a gain change in the first mode. The volume value can be changed by the second mode by switching, and a volume adjusting element that outputs the input audio signal by giving a gain of the volume value, and for changing the volume value in the volume adjusting element Operating means, and control means for giving a control value of the volume value according to the operation of the operating means to the sound volume adjusting element, the control means by applying a control value according to the operation of the operating means When the change of the volume value exceeds the predetermined boundary value and increases the volume value, the control obtained by subtracting half of the change amount of the volume value to be changed by the first mode from the control value at that time Give value Then, the volume value in the first mode starts to decrease, and when the volume value decrease is completed, the volume value is increased in the second mode, and a control value obtained by subtracting the remaining half of the change amount is given. Then, when the volume value is changed by the first mode and the change of the volume value by the application of the control value according to the operation of the operation means exceeds the predetermined boundary value, the volume value is reduced. Gives a control value obtained by adding half of the change amount of the volume value to be changed in the first mode from the control value at that time, and starts to increase the volume value in the first mode. When the increase is completed, the volume value is decreased in the second mode, and a control value obtained by adding the remaining half of the change amount is added to start increasing the volume value in the first mode.

The program of the present invention causes a computer to function as control means in the volume control device of the present invention or another volume control device of the present invention.

The volume control method of the present invention is based on the first mode based on the application of a control value for controlling the volume value , and the switching of the applied voltage in which the speed for changing the same amount of gain is faster than the gain change in the first mode. The volume value can be changed by the second mode, and a volume adjusting element that outputs the input audio signal with a gain of the volume value, and an operating means for changing the volume value in the volume adjusting element A volume control method in a volume control apparatus comprising: a control unit that applies a control value of the volume value according to an operation of the operation unit to the volume adjustment element, wherein the control is performed according to the operation of the operation unit When the change of the volume value by the value addition exceeds the predetermined boundary value and increases the volume value, the change amount of the volume value to be changed by the first mode is subtracted from the control value at that time The control value is added to start the decrease of the volume value by the first mode, and when the half of the change amount is completed, the volume value is increased by the second mode, and the operation means is operated. When the change of the sound volume value by applying the corresponding control value exceeds the predetermined boundary value and the sound volume value is decreased, the change of the sound volume value to be changed by the first mode from the control value at that time The control value obtained by adding the amount is given to start increasing the volume value by the first mode, and when the increase of half of the change amount is completed, the volume value is decreased by the second mode. The volume adjusting element reduces the volume value of the remaining half of the change amount after the volume value is increased in the second mode, and after the decrease of the volume value in the second mode, the remaining half of the change amount. Increase the volume value for .

Another volume control method of the present invention includes a first mode in which a control value for controlling a volume value is applied , and a speed of changing the gain of the same amount is faster than a gain change in the first mode. The volume value can be changed by the second mode by switching, and a volume adjusting element that outputs the input audio signal by giving a gain of the volume value, and for changing the volume value in the volume adjusting element A volume control method in a volume control apparatus comprising: an operation unit; and a control unit that applies a control value of the volume value according to an operation of the operation unit to the volume adjustment element, the volume control method according to an operation of the operation unit If the change in the volume value due to the addition of the control value exceeds the predetermined boundary value and increases the volume value, the change amount of the volume value to be changed in the first mode from the control value at that time of The control value obtained by subtracting the minute is applied to start the decrease of the volume value by the first mode, and when the decrease of the volume value is completed, the volume value is increased by the second mode. The control value obtained by subtracting the remaining half is applied to start the decrease of the volume value in the first mode, and the volume value change due to the application of the control value according to the operation of the operation means exceeds the predetermined boundary value. When the value is to be decreased, a control value obtained by adding half of the change amount of the volume value to be changed by the first mode is added from the control value at that time, and the volume value of the first mode is set. When the increase is started, the volume value is decreased by the second mode when the increase of the volume value is completed, and a control value obtained by adding the remaining half of the change amount is added to the volume value by the first mode. To start increasing That.

  According to the present invention, when the change of the volume value exceeds the predetermined value and increases or decreases the volume value, the volume value is changed in the first and second modes, and the first mode is changed. When the change in the volume value by the predetermined amount has progressed by a predetermined amount, the volume value is changed in the second mode by switching the voltage applied to the volume adjustment element to the voltage one level higher or lower, so the volume value is large. In this case, a large applied voltage is used, and when the volume value is small, a small applied voltage is used, and a sufficient change range of the volume value is ensured while suppressing noise at a small volume value. It is possible to make the change of the volume value depending on the mode inconspicuous and to change the volume value as smoothly as possible.

  FIG. 1 is a block diagram showing a configuration of an audio apparatus according to an embodiment of the present invention. This apparatus includes a system microcomputer 1 that controls each part of the apparatus, an ADC 3 with an input selector that selects one of analog input signals from an analog input terminal 2 and converts it to a digital signal, and a digital audio from a digital input terminal 4 A digital audio interface receiver 5 that receives a signal or a digital audio signal from the ADC 3 with an input selector and generates a clock necessary for sound reproduction, etc., and an acoustic effect on the digital audio signal supplied from the digital audio interface receiver 5 DSP 6 that performs necessary signal processing such as signal assignment and signal format conversion, output volume adjustment element 8 that adjusts the audio signal from DSP 6 and supplies it to speaker 7, and switching that switches applied voltage to output volume adjustment element 8 in several steps Switch 9, the user A display unit 11 for the operation unit 10 for giving instructions to Temu microcomputer 1, and the system microcomputer 1 performs necessary display to the user.

  The volume value of the output volume adjusting element 8 can be changed by the first change mode by applying the volume value or the second change mode by switching the applied voltage. In other words, the volume value of the output volume adjustment element 8 varies by the amount of the variation due to the volume value applied to the output volume adjustment element 8 and the variation due to switching of the applied voltage to the output volume adjustment element 8. Then, the output volume adjusting element 8 gives the gain of the volume value to the input audio signal and outputs it. That is, here, the gain that is actually applied to the input audio signal by the output volume adjustment element 8 is referred to as “volume value”, and is applied to the output volume adjustment element 8 in order to adjust the volume value. The data value for volume control is called “volume value”.

  The operation unit 10 includes a volume adjustment operator. The system microcomputer 1 changes the volume value in the output volume adjustment element 8 in accordance with the internal program, in accordance with the operation of the operation element, in the first change mode, or in addition to the second change mode. Thus, the volume control for the audio signal output from the DSP 6 to the speaker 8 is performed. In the change of the volume value in the second change mode, the output volume adjustment element 8 completes the change as soon as the applied voltage is switched. However, in changing the volume value in the first change mode, a certain amount of time is required until the change is completed.

  FIG. 2 is a flowchart showing the volume control processing by the system microcomputer 1. FIG. 4 illustrates the relationship among the volume value, the voltage applied to the output volume control element 8 and the data value as the volume value given to the output volume control element 8 in this process. 4 is a graph curve showing a change in applied voltage with respect to a change in volume value, and 49 is a graph curve showing a change in data value (volume value) with respect to a change in volume value.

  In this process, the volume value is changed in the first change mode by giving a volume value to the output volume control element 8 in accordance with the operation of the volume adjustment operator (steps 21, 22, 33, 34). 45, 46) When the volume value to be applied is to increase or decrease the volume value of the output volume element 8 beyond a predetermined boundary value (steps 23, 24), the volume value of the second change mode The volume value is changed together with the change (steps 25 to 32, 37 to 44). At that time, when the decrease or increase of the volume value in the first change mode is half completed, the applied voltage in the second change mode is switched (steps 27, 28, 31, 32, 39, 40, 43, 44).

  In this process, the change-over switch 9 can switch the voltage applied to the output volume adjusting element 8 in three stages of A [V], B [V], or C [V] (A <B <C). A [V], B [V], and C [V] are assumed to be 10 [V], 15 [V], and 25 [V], respectively, as shown in FIG. Therefore, for example, when the volume value is increased, as shown in the figure, the applied voltage is kept at 10 [V] until the volume value reaches −10 [dB], and only the volume value applied as the data value is changed. The volume value is controlled while the applied voltage is switched to 15 [V] when the volume value exceeds −10 [dB], and the volume value increased by 5 [V] is thereby suppressed to an increase of 1 [dB]. In addition, a process is performed in which a volume value obtained by subtracting n [dB] (= 4 [dB]) from the volume value at that time is applied to the output volume adjustment element 8.

  That is, as shown in FIG. 2, when the volume control process is started, the system microcomputer 1 first waits for a volume value change instruction by the operation of the volume adjustment operator in step 21. If a change instruction is detected, it is determined in step 22 whether the change instruction is a change instruction for increasing the volume or a change instruction for decreasing the volume. If it is determined that the instruction is to change the direction to increase, in steps 23 and 24, the voltage applied to the output volume adjustment element 8 is changed from A [V] to B based on the current volume value of the output volume adjustment element 8. It is determined whether or not to switch to [V] or from B [V] to C [V]. For example, in the example of FIG. 4, when the current volume value is −10 [dB] or 0 [dB], it is determined that the applied voltage should be switched to a voltage one level higher. Become.

  If it is determined that switching from A [V] to B [V] is to be performed, the process proceeds to step 25, where the volume value p [dB] given to the output volume adjusting element 8 at that time is set to a predetermined value n [ The volume value (p−n) [dB] obtained by subtracting [dB] is obtained. Next, in step 26, the obtained volume value (p−n) [dB] is sent to the output volume adjustment element 8. Thereby, the volume value of the output volume adjusting element 8 starts to decrease from the volume value at that time.

  As the predetermined value n [dB], for example, the gain value a [dB] that changes when the applied voltage is switched from A [V] (= 10 [V]) to B [V] (= 15 [V]). ] Is a value obtained by subtracting 1 [dB]. For example, if the gain changes by 1 [dB] with respect to the change of 1 [V] in the applied voltage, a [dB] = (15−10) [V] × 1 [dB] / 1 [V] = 5 [dB], n [dB] = a [dB] -1 [dB] = 4 [dB].

  Next, in step 27, it waits for the volume value of the output volume adjusting element 8 to change by n / 2 [dB]. When a change of n / 2 [dB] (= 2 [dB]) is detected, the process proceeds to step 28 where the voltage applied to the volume adjusting element 8 is switched to B [V] by the changeover switch 9. As a result, the volume value of the volume adjusting element 8 is increased by a [dB] (= 5 [dB]) described above. That is, at this time, the volume value is increased by 5 [dB] −2 [dB] = 3 [dB] compared to the volume value at the time when the volume change instruction is given. After this, the process returns to step 21.

  However, after this, the volume value of the output volume adjusting element 8 further decreases by the remaining n / 2 [dB] (= 2 [dB]). As a result, finally, the volume value of the output volume adjusting element 8 becomes a value increased by 1 [dB] compared to the volume value at the time when the volume change instruction is given.

  On the other hand, if it is determined in steps 23 and 24 that switching from B [V] (= 15 [V]) to C [V] (25 [V]) is to be performed, the above-described step 25 is performed in steps 29 to 32. The same processing as that of ~ 28 is performed. The difference is that the voltage switching by the selector switch 9 is switching from B [V] (= 15 [V]) to C [V] (= 25 [V]), and the above-mentioned predetermined value n [dB]. The only difference is that m [dB] is used instead of.

  In this case, as m [dB], for example, as shown in FIG. 4, the applied voltage is switched from B [V] (= 15 [V]) to C [V] (= 25 [V]). The value obtained by subtracting 1 [dB] from the gain value a [dB] that changes to 1 corresponds. For example, if the gain changes by 1 [dB] with respect to the change of 1 [V] in the applied voltage, a [dB] = (25−15) [V] × 1 [dB] / 1 [V] = 10 [dB], m [dB] = a [dB] -1 [dB] = 9 [dB].

  In Steps 23 and 24, if it is determined that neither switching of the applied voltage should be performed, the volume value is changed only in the first change mode. That is, the process proceeds to step 33, and a volume value obtained by adding 1 [dB] to the volume value assigned to the output volume adjusting element 8 at that time is obtained. Next, in step 34, the obtained volume value is sent to the output volume adjusting element 8, and the process returns to step 21. As a result, the volume value of the output volume adjusting element 8 is increased by 1 [dB].

  On the other hand, if it is determined in step 22 that the change instruction is an instruction to decrease the volume, the process proceeds to step 35 and the processes of steps 35 to 46 are performed. This process is the same as the process of steps 23 to 34 described above. The difference is that the switching of the applied voltage by the changeover switch 9 is either B [V] to A [V] (step 40) or C [V] to B [V] (step 44). And the volume value sent to the output volume adjusting element 8 is only the point (steps 37, 41, 45) obtained by adding or decrementing n [dB] or m [dB] from the current volume value. .

  In other words, the system microcomputer 1 determines in steps 35 and 36 that the change of the volume value due to the application of the volume value according to the operation of the volume adjustment operator exceeds the predetermined boundary value and decreases the volume value. If so, the volume value is changed using both the first and second change modes (steps 37 to 44). In other cases, the volume value is changed only in the first change mode (steps 45 and 46).

  When the volume value is changed using both the first and second change modes, the change amount of the volume value to be changed in the first change mode from the volume value given to the output volume adjustment element 8 at that time. The volume value obtained by adding n [dB] or m [dB] is applied to the output volume adjustment element 8 to start the volume value change in the first change mode (steps 37, 38, 41, 42), and the change amount When the half of the change is completed, the volume value is changed in the second change mode (steps 39, 40, 43, and 44). Thereafter, the output volume adjusting element 8 reduces the volume value for the remaining half of the change amount.

  FIG. 5 shows a state where the volume value of the output volume adjusting element 8 is decreased by the processing of FIG. In the figure, 51 is a graph curve showing the change in the actual volume value obtained by adding the adjustment amount based on the applied voltage to the volume value portion based on the volume value, and 52 is the change in only the volume value portion based on the volume value. It is a graph curve shown.

  As shown in the figure, when an instruction to decrease the volume is detected at time t1 (steps 21 and 22), the applied voltage is changed from B [V] to A [based on the volume value (10 [dB]) at that time. Since it is determined that the point should be switched to V] (step 35), the change in the volume value starts from the volume value at the time point t1 to a volume value higher by n [dB] (= 4 [dB]). (Steps 37 and 38). At time t2 when the volume value increases by n / 2 [dB], the voltage applied to the output volume adjustment element 8 is switched to A [V], and the volume value is reduced by 5 [dB] (step 28). Further, the sound volume value increases by the remaining n / 2 [dB], and at time point t3, the sound volume value is 1 [dB] less than the value at time point t1.

  According to the present embodiment, as shown in FIG. 5, the volume value can be changed more smoothly than in the conventional technique of FIG.

  FIG. 3 is a flowchart showing another volume control process by the system microcomputer 1. In the processing of FIG. 2, when there is a volume change instruction operation (step 21), n [dB] or m [dB] is subtracted or added from the volume value given to the output volume adjustment element 8 at that time. (Steps 25, 29, 37, 41) are sent to the output volume adjusting element 8 (steps 26, 30, 38, 42), and the volume value of the output volume adjusting element 8 is n / 2 [dB] or When m / 2 [dB] decreases (steps 27 and 31) or increases (steps 39 and 43), the applied voltage is changed between A [V] and B [V] or between B [V] and C [V]. Switching is performed (steps 28, 32, 40, 44).

  On the other hand, in the process of FIG. 3, the transmission (giving) of the volume value to the output volume adjusting element 8 is divided into two times, and the volume of the output volume adjusting element 8 is transmitted for the first volume value transmission. The applied voltage is switched when the value follows, and then the second volume value is transmitted.

  That is, when there is a volume change instruction operation (step 61), in step 63 and 64 or 77 or 78, the change of the volume value due to the volume value according to the operation exceeds the predetermined boundary value and the volume value Is determined to increase or decrease, in steps 65 and 66, 70 and 71, 79 and 80, or 84 and 85, the volume value assigned to the output volume adjusting element 8 at that time The volume value obtained by subtracting or adding n / 2 [dB] or m / 2 [dB] from is sent to the output volume adjusting element 8. Then, when the volume value of the output volume adjustment element 8 follows the sent volume value, in step 67, 72, 81, or 86, the applied voltage is switched corresponding to the increase or decrease of the volume value. In steps 68 and 69, 73 and 74, 82 and 83, or 87 and 88, n / 2 [dB] or m / 2 [dB] is subtracted from the volume value applied to the output volume adjusting element 8 at that time. Alternatively, the added volume value is sent to the output volume adjusting element 8.

  Also by this, the same effect as the case of the process of FIG. 2 can be acquired, and the smooth change of a volume value similar to the case of FIG. 5 can be obtained.

Note that the present invention is not limited to the above-described embodiment, and can be appropriately modified and implemented. For example, in the above description, a switch 9 that switches between three types of applied voltages is used as the change-over switch 9, but the types of switchable applied voltages are not limited to this, and there may be two types or four or more types. May be.
The present invention includes the following embodiments.
As the volume control device, for example, a device used for adjusting the output volume in an audio device or the like is applicable. As the predetermined boundary value, for example, a value close to the maximum volume value possible by the applied voltage to the volume adjusting element before the volume value is changed corresponds.
In this configuration, when the change in the sound volume value due to the application of the control value according to the operation of the operation means exceeds the predetermined value and increases or decreases the sound volume value, the control means The change is performed in the first and second modes, and the volume value in the second mode is changed by switching the voltage applied to the volume adjustment element to a voltage one level higher or lower. Accordingly, a large applied voltage is used when the volume value is large, and a small applied voltage is used when the volume value is small.
However, the volume value when the applied voltage is switched to a voltage higher or lower by one stage greatly exceeds the target volume value. Therefore, in order to obtain the target volume value, it is necessary to cancel the extra increase or decrease in the volume value due to the second mode by changing the volume value according to the first mode. The change in the volume value in the second mode is completed simultaneously with the switching of the applied voltage, but the change in the volume value in the first mode requires a certain amount of time from the application of the control value to the completion of the change. And
However, if the changes in both modes are performed simultaneously, a large change in the second mode first occurs, and then the change in the first mode takes some time to cancel out the large change until the intended volume value is obtained. Therefore, a large change in the second mode is conspicuous. Therefore, in the present invention, the volume value is changed in the second mode when the change in the volume value in the first mode proceeds to some extent so that the change in the volume value is as smooth as possible.

It is a block diagram which shows the structure of the audio apparatus which concerns on one Embodiment of this invention. It is a flowchart which shows the volume control process by the system microcomputer in the apparatus of FIG. It is a flowchart which shows another volume control process by the system microcomputer in the apparatus of FIG. It is a figure which illustrates the relationship between the volume value in the process of FIG. 2, an applied voltage, and a data value (volume value). It is a figure which shows a mode that the volume value of an output volume adjustment element changes with the process of FIG. It is a figure which shows a mode that the volume value of the output volume adjustment element which concerns on a prior art changes.

Explanation of symbols

  1: system microcomputer, 2: analog input terminal, 3: ADC with input selector, 4: digital input terminal, 5: digital audio interface receiver, 6: DSP, 7: speaker, 8: output volume adjusting element, 9: changeover switch 10: operation unit, 11: display unit, 48, 49, 51, 52: graph curve.

Claims (5)

The volume value is changed by the first mode by giving a control value for controlling the volume value, and by the second mode by switching the applied voltage, the speed of changing the gain of the same amount is faster than the gain change by the first mode. A volume adjusting element that outputs the input audio signal with a gain of the volume value;
Operation means for changing a volume value in the volume adjustment element;
Control means for providing a control value of the volume value according to the operation of the operation means to the volume adjustment element,
The control means includes
When the change of the volume value by giving the control value according to the operation of the operation means exceeds the predetermined boundary value and increases the volume value, the change is made in the first mode from the control value at that time The control value obtained by subtracting the change amount of the sound volume value to be applied is applied to start the decrease of the sound volume value by the first mode, and when the half of the change amount is completed, the sound volume value increase by the second mode is completed. And
When the change of the volume value by giving the control value according to the operation of the operation means is to reduce the volume value exceeding a predetermined boundary value, the change is made in the first mode from the control value at that time A control value obtained by adding the change amount of the volume value to be added is applied to start the increase of the volume value by the first mode, and when the increase of half of the change amount is completed, the decrease of the volume value by the second mode is completed. Is what
The volume adjusting element reduces the volume value of the remaining half of the change amount after the volume value is increased in the second mode, and after the decrease of the volume value in the second mode, the remaining half of the change amount. A volume control apparatus for increasing the volume value of The volume value is changed by the first mode by giving a control value for controlling the volume value, and by the second mode by switching the applied voltage, the speed of changing the gain of the same amount is faster than the gain change by the first mode. A volume adjusting element that outputs the input audio signal with a gain of the volume value;
Operation means for changing a volume value in the volume adjustment element;
Control means for providing a control value of the volume value according to the operation of the operation means to the volume adjustment element,
The control means includes
When the change of the volume value by giving the control value according to the operation of the operation means exceeds the predetermined boundary value and increases the volume value, the change is made in the first mode from the control value at that time A control value obtained by subtracting half of the change in the volume value to be applied is applied to start the volume value decrease in the first mode, and when the volume value decrease is completed, the volume value increase in the second mode is completed. And further giving a control value obtained by subtracting the remaining half of the change amount to start a decrease in volume value by the first mode,
When the change of the volume value by giving the control value according to the operation of the operation means is to reduce the volume value exceeding a predetermined boundary value, the change is made in the first mode from the control value at that time A control value obtained by adding half of the change amount of the volume value to be applied is applied to start increasing the volume value in the first mode, and when the increase in the volume value is completed, the volume value is decreased in the second mode. And a control value obtained by adding the remaining half of the change amount is added to start increasing the volume value in the first mode . A program for causing a computer to function as control means in the volume control device according to claim 1. The volume value is changed by the first mode by giving a control value for controlling the volume value, and by the second mode by switching the applied voltage, the speed of changing the gain of the same amount is faster than the gain change by the first mode. A volume adjusting element that outputs the input audio signal with a gain of the volume value;
Operation means for changing a volume value in the volume adjustment element;
A volume control method in a volume control apparatus, comprising: a control unit that applies a control value of the volume value according to an operation of the operation unit to the volume adjustment element;
When the change of the volume value by giving the control value according to the operation of the operation means exceeds the predetermined boundary value and increases the volume value, the change is made in the first mode from the control value at that time The control value obtained by subtracting the change amount of the sound volume value to be applied is applied to start the decrease of the sound volume value by the first mode, and when the half of the change amount is completed, the sound volume value increase by the second mode is completed. And
When the change of the volume value by giving the control value according to the operation of the operation means is to reduce the volume value exceeding a predetermined boundary value, the change is made in the first mode from the control value at that time A control value obtained by adding the change amount of the volume value to be added is applied to start the increase of the volume value by the first mode, and when the increase of half of the change amount is completed, the decrease of the volume value by the second mode is completed. Is what
The volume adjusting element reduces the volume value of the remaining half of the change amount after the volume value is increased in the second mode, and after the decrease of the volume value in the second mode, the remaining half of the change amount. A volume control method characterized by increasing the volume value for . The volume value is changed by the first mode by giving a control value for controlling the volume value, and by the second mode by switching the applied voltage, the speed of changing the gain of the same amount is faster than the gain change by the first mode. A volume adjusting element that outputs the input audio signal with a gain of the volume value;
Operation means for changing a volume value in the volume adjustment element;
A volume control method in a volume control apparatus, comprising: a control unit that applies a control value of the volume value according to an operation of the operation unit to the volume adjustment element;
When the change of the volume value by giving the control value according to the operation of the operation means exceeds the predetermined boundary value and increases the volume value, the change is made in the first mode from the control value at that time A control value obtained by subtracting half of the change in the volume value to be applied is applied to start the volume value decrease in the first mode, and when the volume value decrease is completed, the volume value increase in the second mode is completed. And further giving a control value obtained by subtracting the remaining half of the change amount to start a decrease in volume value by the first mode,
When the change of the volume value by giving the control value according to the operation of the operation means is to reduce the volume value exceeding a predetermined boundary value, the change is made in the first mode from the control value at that time A control value obtained by adding half of the change amount of the volume value to be applied is applied to start increasing the volume value in the first mode, and when the increase in the volume value is completed, the volume value is decreased in the second mode. And a control value obtained by adding the remaining half of the change amount is added to start increasing the volume value in the first mode .

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