WO2018179783A1 - アンプ装置 - Google Patents
アンプ装置 Download PDFInfo
- Publication number
- WO2018179783A1 WO2018179783A1 PCT/JP2018/002744 JP2018002744W WO2018179783A1 WO 2018179783 A1 WO2018179783 A1 WO 2018179783A1 JP 2018002744 W JP2018002744 W JP 2018002744W WO 2018179783 A1 WO2018179783 A1 WO 2018179783A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- volume
- amplifier
- function
- audio
- operation member
- Prior art date
Links
- 230000003321 amplification Effects 0.000 title claims abstract description 28
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 28
- 230000005236 sound signal Effects 0.000 claims description 48
- 230000006870 function Effects 0.000 description 126
- 238000010586 diagram Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- 230000007423 decrease Effects 0.000 description 5
- 238000007792 addition Methods 0.000 description 2
- 238000005401 electroluminescence Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/02—Manually-operated control
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
- H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
Definitions
- This disclosure relates to an amplifier device configured to switch between an amplifier function capable of adjusting the volume and an amplifier function capable of adjusting the volume.
- Patent Document 1 discloses an audio apparatus including a plurality of external input terminals, input switching means, volume setting means, and volume storage means.
- the input switching means alternatively selects audio signals input from a plurality of external input terminals and inputs them to the amplifier unit.
- the volume setting means increases or decreases the volume by an external operation.
- the volume storage means stores a volume for each audio signal input from the external input terminal.
- the audio apparatus is configured to ring an audio speaker at a volume stored for the audio signal when the audio signal input to the amplifier unit is switched by the input switching unit. Thereby, the volume can be set for each external input terminal.
- an amplifier device configured to switch between a first amplifier function that can adjust the volume and a second amplifier function that cannot adjust the volume, when the amplifier function is switched, sound is output at an unintended volume. May be.
- the present disclosure provides an amplifier device configured to switch an amplifier function, and suppresses an audio output at an unintended volume when the amplifier function is switched.
- the amplifier device is an amplifier device configured to switch between a first amplifier function that allows volume adjustment and a second amplifier function that does not allow volume adjustment.
- the amplifier device receives a volume setting, an operation member whose state changes in accordance with the volume, and a signal processing circuit that amplifies an input audio signal so as to obtain the volume set by the operation member And a control unit for controlling the signal processing circuit.
- the control unit controls the amplification operation of the signal processing circuit so that the volume set by the operation member is obtained during execution of the first amplifier function.
- the state of the operation member is changed to the first amplifier function.
- the state corresponding to the second volume larger than the first volume output immediately before switching from the amplifier function to the second amplifier function the state of the operation member is set to be higher than the second volume.
- the state is changed to the state corresponding to a small third volume, and the amplification operation of the signal processing circuit is controlled to output the third volume.
- FIG. 1 is an overall configuration diagram of an audio system according to the present disclosure.
- FIG. 2 is a block diagram of the audio amplifier.
- FIG. 3 is a flowchart showing the operation of the audio amplifier when the amplifier function is switched.
- FIG. 4 is a diagram showing an example of a table that is referred to when determining the volume setting value according to the volume position.
- FIG. 5 is a diagram illustrating hysteresis with respect to the range of the A / D value.
- FIG. 6 is a diagram for explaining the hysteresis with respect to the range of the A / D value when the operation for lowering the volume is performed.
- FIG. 7 is a diagram for explaining the hysteresis with respect to the range of the A / D value when the operation for increasing the volume is performed.
- FIG. 1 is an overall configuration diagram of an audio system according to an embodiment of the present disclosure.
- the audio system 100 includes an audio amplifier 10, speakers 61L and 61R connected to the audio amplifier 10, an AV (Audio Visual) selector 50, and speakers 63SL, 63SR, 63SB, and 63SW connected to the AV selector 50. Including. Furthermore, the audio system 100 includes audio reproduction devices 41 and 42 connected to the audio amplifier 10 and audio reproduction devices 43 and 44 connected to the AV selector 50.
- the AV selector 50 selects one of a plurality of sound reproduction devices (for example, sound reproduction devices 43 and 44) as a sound source, and outputs a sound signal from the selected sound source to an external device (for example, the audio amplifier 10). It is a device to do.
- the AV selector 50 amplifies the input audio signal and outputs the amplified audio signal to an external device.
- the AV selector 50 also has a function of outputting an audio signal based on the input audio signal to the speakers 63SL, 63SR, 63SB, and 63SW.
- the audio playback devices 41 to 44 are examples of sound sources.
- the audio reproducing devices 41 to 44 are devices that reproduce and output audio signals from recording media such as optical disks, hard disks, and memory cards.
- the audio playback devices 41 to 44 may be devices that acquire audio data via a network and output them as audio signals.
- the audio playback devices 41 to 44 are, for example, a CD (Compact Disc) player, a BD (Blu-ray (registered trademark) Disc) player, a record player, a network audio player, a tuner, or a smartphone.
- the audio amplifier 10 is a device that amplifies an audio signal and outputs audio corresponding to the amplified audio signal from the speakers 61L and 61R.
- the audio amplifier 10 can function as a preamplifier, a main amplifier (that is, a power amplifier), and a pre-main amplifier.
- the preamplifier function and the pre-main amplifier function are examples of a first amplifier function that can adjust the volume.
- the main amplifier function is an example of a second amplifier function in which volume adjustment is impossible.
- the audio amplifier 10 includes a power switch 11, an input selector 15, a volume knob 13, and a display unit 17.
- the power switch 11 is a switch for switching the power on / off of the audio amplifier 10.
- the input selector 15 is a switch for switching the sound source of the sound output from the speakers 61L and 61R.
- the audio amplifier 10 includes a plurality of audio input terminals (hereinafter referred to as input terminals). Each input terminal is a pair of L and R terminals.
- the input selector 15 switches the input destination of the audio signal to one of the input terminals. For example, it is assumed that a plurality of input terminals are connected to the audio playback device 41, the audio playback device 42, and the AV selector, respectively. In this case, the input selector 15 is an operation member that switches the audio input destination to any one of the audio reproduction device 41, the audio reproduction device 42, and the AV selector 50.
- the volume knob 13 is an operation member for the user to set the volume by a rotating operation.
- the display unit 17 is a device that displays various types of information (for example, sound volume), and includes a liquid crystal device, an organic EL (Electro Luminescence) device, or the like.
- FIG. 2 is a block diagram showing an internal configuration of the audio amplifier 10. Note that FIG. 2 mainly shows a configuration related to the volume adjustment function of the audio amplifier 10.
- the audio amplifier 10 includes a microcontroller 20, a memory 22, a volume control circuit 24, a DSP (digital signal processor) 25, an input switching circuit 28, and a motor 26.
- the microcontroller 20 is an example of a control unit.
- the microcontroller 20 performs various controls relating to the operation of the audio amplifier 10.
- the microcontroller 20 inputs a signal corresponding to a user operation from the input selector 15 and the volume knob 13.
- the microcontroller 20 includes an AD (analog / digital) converter 21 therein.
- the memory 22 is a non-volatile memory that stores volume setting information by the volume knob 13.
- the memory is, for example, a flash memory.
- the volume control circuit 24 outputs a signal related to volume setting.
- the DSP 25 is an example of a signal processing circuit.
- the DSP 25 is a circuit that performs predetermined audio processing such as signal amplification, equalizing, and adjustment of left / right balance on the input audio signal.
- the DSP 25 includes an AD converter, a signal processing circuit, and a DA (digital / analog) converter.
- the input switching circuit 28 selects any one of the input terminals 31, 32, and 33 and connects it to the DSP 25.
- the input terminals 31, 32, and 33 are LR terminal pairs, respectively.
- the output of the DSP 25 is connected to output terminals 34 and 35.
- the motor 26 rotates the volume knob 13 under the control of the control unit.
- the audio amplifier 10 includes input terminals 31 to 33 for inputting a sound signal from a sound source and output terminals 34 and 35 for outputting the sound signal to an external device.
- the input terminal 31 is a terminal for inputting an audio signal to be processed in the audio amplifier 10 when the audio amplifier 10 is operated as a preamplifier.
- the input terminal 32 is a terminal for inputting an audio signal to be processed in the audio amplifier 10 when the audio amplifier 10 is operated as a pre-main amplifier.
- the input terminal 33 is a terminal for inputting an audio signal to be processed in the audio amplifier 10 when the audio amplifier 10 is operated as a main amplifier.
- the audio reproduction device 41 is connected to the input terminal 31
- the audio reproduction device 42 is connected to the input terminal 32
- the output of the AV selector 50 is connected to the input terminal 33.
- the audio amplifier 10 of the present embodiment can function as a preamplifier, a main amplifier, and a premain amplifier. Which amplifier functions is switched according to the selection by the input selector 15. That is, when the input terminal 31 is selected by the input selector 15, the audio amplifier 10 operates as a preamplifier. When the input terminal 32 is selected by the input selector 15, the audio amplifier 10 operates as a pre-main amplifier. When the input terminal 33 is selected by the input selector 15, the audio amplifier 10 operates as a main amplifier.
- the output terminal 34 is a terminal for outputting an audio signal to the speakers 61L and 61R.
- the output terminal 35 is a terminal for outputting an audio signal to the main amplifier at the next stage when the audio amplifier 10 operates as a preamplifier.
- each of the input terminals 31 to 33 is a single terminal. Shown with terminals. Similarly, a pair of terminals are required as output terminals to output the L channel and R channel audio signals. In FIG. 2, for convenience of explanation, each of the output terminals 34 and 35 is shown as one terminal. ing.
- preamplifier function An operation when the audio amplifier 10 is caused to function as a preamplifier in the audio system 100 will be described.
- the audio amplifier 10 performs signal amplification processing on the audio signal input from the audio reproduction device 41 via the input terminal 31. Further, in addition to signal amplification, the audio amplifier 10 can also control the high sound range, the low sound range, the mid sound range, and adjust the left / right balance according to a user operation.
- the audio amplifier 10 outputs the amplified audio signal to an external amplifier device (not shown) that operates as a main amplifier via the output terminal 35. This external amplifier device amplifies the power of the audio signal input from the audio amplifier 10 and drives the speaker. At this time, the volume of the sound finally output from the speaker is adjusted by the audio amplifier 10. That is, the audio amplifier 10 changes the magnitude of the audio signal to be output in accordance with the operation of the volume knob 13.
- pre-main amplifier function When operating as a pre-main amplifier (pre-main amplifier function) An operation when the audio amplifier 10 functions as a pre-main amplifier in the audio system 100 will be described.
- the audio amplifier 10 performs signal amplification processing and power amplification processing on the audio signal input from the audio reproduction device 42 via the input terminal 32. In addition to signal amplification, the audio amplifier 10 performs control of a high sound range, a low sound region, a mid sound region (that is, equalizing processing), adjustment of left / right balance, and the like according to a user operation.
- the audio amplifier 10 outputs the amplified audio signal to the speakers 61L and 61R.
- the volume of the sound output from the speakers 61L and 61R is adjusted by the audio amplifier 10.
- the audio amplifier 10 changes the magnitude of the audio signal to be output in accordance with the operation of the volume knob 13.
- the AV selector 50 can be operated as a preamplifier, and the audio amplifier 10 can be operated as a main amplifier.
- the audio amplifier 10 inputs an audio signal from the AV selector 50 via the input terminal 33, amplifies the power of the input audio signal to a magnitude for driving the speakers 61L and 61R, and the speaker 61L, Output to 61R. Thereby, a sound is output from the speakers 61L and 61R.
- the audio amplifier 10 When operating as a main amplifier, the audio amplifier 10 is configured such that the volume adjustment function is turned off. That is, when operating as a main amplifier, the audio amplifier 10 performs signal amplification on the audio signal with a fixed amplification factor (for example, the maximum value of the amplification factor).
- a fixed amplification factor for example, the maximum value of the amplification factor
- the volume knob 13 of the audio amplifier 10 when operating as the main amplifier, even if the volume knob 13 of the audio amplifier 10 is operated, the volume of the sound finally output from the speakers 61L and 61R does not change. At this time, the volume is adjusted by a device functioning as a preamplifier, that is, the volume knob 53 of the AV selector 50.
- the audio amplifier 10 of this embodiment can be operated by switching to the functions of the preamplifier, the pre-main amplifier, and the main amplifier.
- the inventors of the present application have found that when the amplifier function of the amplifier device is switched as described above, the following problems may occur with respect to the volume of the sound output from the speaker.
- the volume of the sound output from the speaker is adjusted according to the operation of the volume knob 13 of the audio amplifier 10. Therefore, when the audio amplifier 10 is operated as a preamplifier or a pre-main amplifier, the volume knob 13 is set to a position rotated to some extent by the user so that a desired sound volume is output from the speaker.
- the audio amplifier 10 when the audio amplifier 10 is switched to a state where it operates as a main amplifier, the volume finally output from the speaker is not the audio amplifier 10 but a device that functions as a preamplifier in front of the audio amplifier 10 (for example, The AV selector 50) adjusts. That is, the audio amplifier 10 does not control the volume. Therefore, even when the volume knob 13 of the audio amplifier 10 is operated by the user, the volume of the sound output from the speaker does not change.
- the audio amplifier 10 is switched from a state in which it operates as a main amplifier to a state in which it operates as a preamplifier or a pre-main amplifier, sound having a volume corresponding to the position of the volume knob 13 of the audio amplifier 10 is output from the speaker. Is done.
- the audio amplifier 10 is set to operate as a preamplifier or pre-main amplifier. When switched, sound is output from the speaker at an unintended high volume.
- FIG. 3 is a flowchart showing the operation of the audio amplifier 10 when switching the amplifier function.
- the flowchart shown in FIG. 3 is executed by the microcontroller 20 of the audio amplifier 10, and is periodically executed at a predetermined cycle.
- the microcontroller 20 of the audio amplifier 10 determines whether the audio amplifier 10 is operating as a preamplifier or a pre-main amplifier (S10).
- the microcontroller 20 makes this determination based on the setting signal from the input selector 15.
- step S14 the process proceeds to step S14 (details will be described later).
- the microcontroller 20 controls the audio amplifier 10 so that sound is output at a volume corresponding to the setting of the volume knob 13 ( S11).
- the microcontroller 20 stores in the memory 22 information indicating the volume setting value (hereinafter referred to as volume setting value) corresponding to the position of the volume knob 13 at that time (S12).
- volume setting value is a setting value associated with the first volume of the present disclosure.
- the microcontroller 20 When the function of the audio amplifier 10 is switched to the main amplifier function (Yes in S13), the microcontroller 20 operates the audio amplifier 10 as the main amplifier (S14). At this time, the microcontroller 20 turns off the volume adjustment function in the audio amplifier 10. That is, the microcontroller 20 does not change the volume even if the position of the volume knob 13 is changed. That is, the microcontroller 20 amplifies the audio signal at a constant amplification factor regardless of the position of the volume knob 13. In this case, the volume is adjusted in a device that operates as a preamplifier in front of the audio amplifier 10.
- the microcontroller 20 determines whether or not the function of the audio amplifier 10 has been switched to the preamplifier or pre-main amplifier function (S15). Until the function of the audio amplifier 10 is switched to the preamplifier or pre-main amplifier function (No in S15), the audio amplifier 10 operates as a main amplifier (S14).
- the microcontroller 20 sets the volume setting value according to the current position of the volume knob 13 immediately before switching to the main amplifier. Is compared with the volume setting value stored in the memory 22 (S16).
- the microcontroller 20 moves the position of the volume knob 13 to the main amplifier. Control is made to a position corresponding to the volume setting value stored in the memory 22 immediately before switching (S17). Specifically, the microcontroller 20 reads the volume setting value immediately before switching to the main amplifier from the memory 22 and drives the motor 26 according to the position corresponding to the read volume setting value. As a result, the volume knob 13 is moved (rotated in this embodiment) to the position immediately before switching to the main amplifier function.
- the sound volume setting value according to the position of the volume knob 13 at the time point determined as Yes in step S16 is a setting value corresponding to the second sound volume of the present disclosure.
- the volume setting value stored in the memory 22 at the time point determined as Yes in step S16 is a setting value corresponding to the first volume of the present disclosure.
- the volume corresponding to the controlled position corresponds to the third volume of the present disclosure.
- the third volume is set to be the same as the first volume.
- the microcontroller 20 does not move the volume knob 13. .
- volume setting value according to the position of the volume knob 13 at the time point determined as No in step S16 is a setting value corresponding to the fourth volume of the present disclosure.
- volume setting value stored in the memory 22 at the time point determined as No in step S16 is a setting value corresponding to the setting value of the first volume of the present disclosure.
- the microcontroller 20 performs control so that sound is output at a volume (that is, the third volume or the fourth volume) according to the position of the volume knob 13 (S18). Specifically, the microcontroller 20 outputs a volume setting value corresponding to the position of the volume knob 13 to the volume control circuit 24.
- the volume control circuit 24 outputs an instruction indicating the volume setting to the DSP 25 based on the volume setting value.
- the DSP 25 amplifies the audio signal so that the volume is based on the volume setting value, and outputs the amplified audio signal to the speakers 61L and 61R via the output terminal 34.
- the audio amplifier 10 when the amplifier function is switched from the main amplifier function to the preamplifier function or the pre-main amplifier function, has previously executed the pre-amplifier function or the pre-main amplifier function. If the volume is higher than the above, the position of the volume knob 13 is changed to a position where the volume is reduced. For example, the position of the volume knob 13 is returned to the position immediately before switching to the main amplifier function (that is, the position that was intentionally set when the user previously used the preamplifier function or the premain amplifier function). Thereby, when the audio amplifier 10 is switched from the main amplifier function to the preamplifier function or the pre-main amplifier function, it is possible to suppress an unintended sound output at a large volume.
- the position of the volume knob 13 is given as an analog signal (for example, an analog voltage).
- the analog signal is input to the microcontroller 20.
- the microcontroller 20 uses the AD converter 21 to convert the input analog signal into a digital value (hereinafter referred to as “A / D value”). Then, the microcontroller 20 determines a sound volume setting value based on the A / D value.
- FIG. 4 is a diagram showing an example of a determination table for determining the volume setting value from the A / D value.
- the determination table divides the entire range of values that the A / D value can take into a plurality of ranges, and manages each divided range as a step (STEP).
- the entire range of values that the A / D value can take is divided into 102 ranges (STEP), and steps 0 to 100 are assigned to 101 ranges among them.
- Volume settings (Vol) 0 to 100 are assigned to steps 0 to 100, respectively.
- the microcontroller 20 refers to the table of FIG. 4 and identifies a step corresponding to the A / D value based on the obtained A / D value. For example, when the A / D value is “105”, since the value belongs to the range of step 9, the microcontroller 20 identifies step 9 as a step corresponding to the A / D value “105”. If the A / D value is “475”, step 46 is specified.
- the microcontroller 20 refers to the table of FIG. 4 and determines the volume setting value based on the identified step. For example, if the identified step is step 9, the volume setting value (Vol) is determined to be “9” with reference to the table of FIG. If the identified step is step 46, the volume setting value (Vol) is determined to be “46” with reference to the table of FIG.
- the volume setting value is determined according to the position of the volume knob 13.
- the A / D value may fluctuate due to slight fluctuation of the volume knob 13 or noise. Accordingly, when the A / D value is in the vicinity of the step boundary, the volume setting value may frequently switch when the A / D value fluctuates.
- the boundary (upper limit, lower limit) of the range of A / D values assigned to each step is changed according to the change direction of the volume setting.
- Such processing for changing the boundary of the A / D value range is hereinafter referred to as hysteresis processing.
- a range of A / D values assigned to each step is referred to as a determination range for each step. This hysteresis processing will be described with reference to FIG.
- the determination range of Step 4 is basically, that is, in the initial setting, the A / D value is 50 to 59 (see FIG. 4).
- the microcontroller 20 changes the boundary of the range of A / D values assigned to the steps according to the direction of change in the volume setting. Specifically, if the detected A / D value is larger than the center value (54.5 in FIG. 5) of the range of A / D values assigned to the corresponding step, the microcontroller 20 As shown in (B), the upper limit of the determination range is shifted by +3.
- the microcontroller 20 shifts the boundary (at least one of the upper limit and the lower limit) of the determination range of the step corresponding to the detected A / D value.
- the detected A / D value that is, the sound volume setting value
- the lower limit of the determination range of the corresponding step is extended.
- the detected A / D value that is, the sound volume setting value
- hysteresis processing for shifting the boundary of the step determination range is performed.
- FIG. 6 is a diagram illustrating a hysteresis process when the volume knob 13 is operated so as to lower the volume.
- FIG. 6 shows an example in which the volume knob 13 is operated by the user from the position corresponding to the A / D value “43” to the position corresponding to the A / D value “26”.
- step 3 is identified as a step corresponding to the detected A / D value “43” from the table of FIG. Is done.
- the determination range of Step 3 is “40” to “49”, and the center value of this determination range is “45”.
- the detected A / D value “43” is smaller than the center value “45” of the corresponding step 3. Therefore, the lower limit of the determination range in Step 3 is expanded from “40” to ⁇ 3 to “37”. For this reason, the determination range of Step 3 is “37 to 49”.
- the detected A / D value decreases from “43”, and when the lower limit “37” is eventually exceeded, (B) in FIG.
- the step corresponding to the detected A / D value switches to step 2.
- the detected A / D value is “36”.
- the determination range of Step 2 is “30” to “39”, and the center value of this range is “35”. Therefore, the A / D value “36” detected at the time shown in FIG. 6B is larger than the center value “35” of step 2.
- the upper limit “39” of the determination range in Step 2 is extended by +3, and the determination range in Step 2 becomes “30 to 42”. That is, since the upper limit of the determination range of Step 2 is expanded, even if the detected A / D value fluctuates slightly in the increasing direction, it is included in the determination range of Step 2 and the steps to be determined are frequent. It can suppress switching to.
- Step 2 is “27 to 39”.
- FIG. 7 is a diagram for explaining the hysteresis process when the volume knob 13 is operated to increase the volume.
- FIG. 7 shows an example in which the volume knob 13 is operated by the user from the position corresponding to the A / D value “36” to the position corresponding to the A / D value “53”.
- step 2 is specified as a step corresponding to the A / D value from the table of FIG.
- the upper limit “39” of the determination range in Step 2 is expanded by +3 to “42”. For this reason, the determination range of Step 2 is “30 to 42”.
- the step corresponding to the A / D value is switched to step 3.
- the lower limit “40” of the determination range in Step 3 is expanded by ⁇ 3, and the determination range in Step 3 becomes “37 to 49”. Since the lower limit of the determination range in step 3 is expanded in this way, even if the A / D value varies slightly in the decreasing direction, it is included in the determination range in step 3 and the determined step is frequently switched. Can be suppressed.
- Step 3 When the volume knob 13 is operated so as to further increase the volume from this state and the A / D value exceeds the center value “45” of step 3, as shown in FIG. While the lower limit is returned to the reference value “40”, the upper limit is expanded by +3, and the determination range in Step 3 is “40 to 52”.
- the hysteresis processing for shifting the boundary of the determination range as described above is performed at a predetermined timing.
- the predetermined timing is, for example, the timing when the detected A / D value enters a new determination range (ie, a new step).
- the predetermined timing includes a timing when it is determined that the operation of the volume knob 13 is stopped.
- the detected fluctuation of the A / D value falls below a predetermined value
- the hysteresis process is performed when it is determined that the operation of the volume knob 13 is stopped, so that when the position of the volume knob 13 is stopped at the boundary of the determination range, the volume setting value fluctuates due to the influence of noise. Can be suppressed. For example, even when the volume operation by the user is finished, the volume setting value is obtained at the position where the volume knob 13 is stopped by the user's intention even when the volume knob 13 is moved due to inertia. Can be suppressed. In particular, when the volume setting value is displayed on the display unit 17, if the display of the volume setting value on the display unit 17 fluctuates even though the user has stopped operating the volume knob 13, Confuse users. Such a problem can be reduced by performing the hysteresis process when it is determined that the operation of the volume knob 13 has stopped as described above.
- the audio amplifier 10 includes the preamplifier function or the pre-main amplifier function (an example of the first amplifier function) that can adjust the volume, and the main amplifier function (the second amplifier function that cannot adjust the volume).
- This is an amplifier device configured to switch between an example of an amplifier function.
- the audio amplifier 10 has input terminals 31 to 33 for inputting audio signals, a volume knob 13 (an example of an operation member) operated by a user to set the volume, and a volume setting value set by the volume knob 13.
- a memory 22 (an example of a storage unit), a DSP 26 (an example of a signal processing circuit) that amplifies an audio signal input through an input terminal so that the volume set by the volume knob 13 can be obtained, and a DSP 25 And a microcontroller 20 to be controlled.
- a DSP 26 an example of a signal processing circuit
- the microcontroller 20 controls the amplification operation of the DSP 25 so that the volume set by the volume knob 13 can be obtained during execution of the preamplifier function or the pre-main amplifier function. Further, the microcontroller 20 stores the set value of the volume set by the volume knob 13 in the memory 22.
- the microcontroller 20 When the microcontroller 20 is switched from the preamplifier function or the pre-main amplifier function to the main amplifier function and then switched to the pre-amplifier function or the pre-main amplifier function, the state of the volume knob 13 is changed to the pre-amplifier function according to a predetermined condition. Or, it returns to the state corresponding to the set value of the volume stored in the memory 22 immediately before switching from the pre-main amplifier function to the main amplifier function. Furthermore, the microcontroller 20 controls the amplification operation of the DSP 25 so that a volume corresponding to the volume setting value stored in the memory 22 immediately before switching is obtained.
- the volume setting value corresponding to the position of the volume knob 13 (that is, the setting value of the second volume) is stored in the memory 22. If it is larger than the set sound volume setting value (that is, the first sound volume setting value), the sound volume is controlled according to the sound volume setting value stored in the memory 22. On the other hand, when the volume setting value corresponding to the position of the volume knob 13 (that is, the fourth volume setting value) is smaller than the volume setting value stored in the memory 22 (or less than the stored volume setting value). ), The microcontroller 20 controls the volume so that the volume corresponding to the position of the volume knob 13 (that is, the fourth volume) is obtained.
- the state of the volume knob 13 is the state before switching to the main amplifier function. Set to Thereby, even if the volume knob 13 is operated during the execution of the main amplifier function, it is possible to suppress the output of unintentionally loud sound.
- the audio amplifier 10 further includes an AD converter 21 that converts the setting of the volume knob 13 into a digital value (A / D value).
- the microcontroller 20 associates the digital value with a predetermined determination range (that is, a step), and converts it into a sound volume setting value according to the step (see FIG. 4).
- the microcontroller 20 shifts the upper limit or lower limit of the determination range in accordance with the detected change direction of the digital value (that is, the determination range is subjected to hysteresis processing).
- the microcontroller 20 shifts the upper limit or the lower limit of the determination range when the volume operation by the user is stopped.
- the first embodiment has been described as an example of the technique disclosed in the present application.
- the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed.
- the audio amplifier 10 has both the preamplifier function and the pre-main amplifier function as the first amplifier function.
- the audio amplifier 10 may have only one of the preamplifier function and the pre-main amplifier function as the first amplifier function.
- the amplifier function of the audio amplifier 10 is switched from the main amplifier function to the preamplifier function or the pre-main amplifier function, and the volume setting value by the volume knob 13 is larger than the volume setting value stored in the memory 22.
- the position of the volume knob 13 was returned to the position immediately before switching to the main amplifier function.
- the position of the volume knob 13 does not necessarily have to be returned to the position immediately before switching to the main amplifier function.
- the position of the volume knob 13 is returned to a predetermined position where a volume (that is, the third volume of the present disclosure) that is smaller than the volume (that is, the second volume of the present disclosure) obtained at the current position is obtained. May be.
- the third volume may not be the same as the stored volume (that is, the first volume of the present disclosure), and may be larger or smaller than the first volume.
- the amplifier function of the audio amplifier 10 is switched from the main amplifier function to the preamplifier function or the pre-main amplifier function, and the volume setting value by the volume knob 13 is compared with the volume setting value stored in the memory 22.
- the position of the volume knob 13 was controlled based on the comparison result.
- the amplifier function of the audio amplifier 10 is switched from the main amplifier function to the preamplifier function or the pre-main amplifier function, the position of the volume knob 13 is unconditionally changed to the position immediately before switching to the main amplifier function. You may return.
- the volume setting value corresponding to the position of the volume knob 13 (that is, the fourth volume setting value) is stored in the memory 22.
- the microcontroller 20 does not change the position of the volume knob 13, and the volume corresponding to the position (that is, the fourth volume). The volume is controlled so that With this configuration, immediately after switching from the main amplifier function to the preamplifier function or the pre-main amplifier function, it is possible to output a small volume in accordance with the user's intention.
- the user may operate a knob so that the volume is intentionally reduced by vigilance of a large volume immediately before switching from the main amplifier function to the preamplifier function or the pre-main amplifier function.
- this user's intention can be met.
- the present disclosure is not limited to this configuration.
- the audio amplifier 100 may change the position of the volume knob 13 even when the fourth volume is smaller than the stored volume (that is, the first volume). It may be configured to change and output a predetermined volume.
- the predetermined volume may be the same as the first volume, for example, and may be larger or smaller than the first volume.
- the volume setting value for each input source May be stored in the memory 22. Thereafter, each time the input selector 15 is switched, the microcontroller 20 reads the volume setting value for the selected input source from the memory 22 and controls the position of the volume knob 13 to a position corresponding to the read volume setting value. (That is, the volume setting value is returned to a value corresponding to the selected input source).
- the position of the volume knob 13 is controlled based on the setting stored in the memory 22 without confirming the volume to be returned to the user when switching from the main amplifier function to the preamplifier function or the premain amplifier function.
- the user may confirm the volume setting to be returned.
- the audio amplifier 10 displays the set value of the volume to be returned on the display unit, and the user operates the volume knob 13 in that state to thereby adjust the volume to be returned. It may be settable.
- an example of a volume knob that performs a rotation operation is shown as an operation member for setting a volume.
- the operation member is not limited to this, and for example, a member that performs volume setting by a slide operation or a member that performs volume setting by a touch panel method may be used.
- the state of the operation member indicates the rotation angle of the operation member.
- the state of the operating member may be the position of the operating member.
- the state of the operation member may be a display of the operation member.
- the hysteresis processing method for the A / D value range for determining the volume setting value is not limited to the above example.
- the shift amount at the boundary of the A / D value range is not limited to 3.
- it is determined which of the upper limit and the lower limit of the range is shifted with reference to the center value of the A / D value range but the present invention is not limited to this.
- the boundary where the difference between the detected A / D value and the upper limit or lower limit of the range of the A / D value is within a predetermined value may be shifted.
- the number of input terminals and output terminals in the amplifier device is not limited to the number described above.
- a microcontroller is shown as an example of a control unit, but the control unit is not limited to this.
- DSP was shown as an example of a signal processing circuit, a signal processing circuit is not limited to this. That is, the control unit and the signal processing circuit are a CPU (Central Processing Unit), an MPU (Micro Processing Unit), an FPGA (Field-Programmable Gate Array), an ASIC (Application Specific Integrated Device, etc.). Can do.
- the present disclosure is an amplifier device that amplifies an audio signal, and is useful for an amplifier device that can switch between an amplifier function that can adjust the volume and an amplifier function that cannot adjust the volume.
- Audio amplifier (amplifier device) 13 Volume knob (operation member) 15 Input selector 20 Microcontroller (control unit) 21 AD converter 22 Memory (storage unit) 24 Volume control circuit 25 DSP (signal processing circuit) 26 Motor (drive unit) 28 Input switching circuit 31 to 33 Input terminal 34 and 35 Output terminal 50 AV selector 41 to 44 Audio reproduction device 61R, 61L, 63SL, 63SR, 63SB, 63SW Speaker 100 Audio system
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Power Engineering (AREA)
- Control Of Amplification And Gain Control (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
Description
図1は、本開示の実施の形態にかかるオーディオシステムの全体構成図を示す。オーディオシステム100は、オーディオアンプ10と、オーディオアンプ10に接続されたスピーカ61L、61Rと、AV(Audio Visual)セレクタ50と、AVセレクタ50に接続されたスピーカ63SL、63SR、63SB、63SWと、を含む。さらに、オーディオシステム100は、オーディオアンプ10に接続された音声再生装置41、42と、AVセレクタ50に接続された音声再生装置43、44とを含む。
以上のように構成されるオーディオシステム100について、その動作を以下説明する。
オーディオシステム100において、オーディオアンプ10をプリアンプとして機能させる場合の動作を説明する。
オーディオシステム100において、オーディオアンプ10をプリメインアンプとして機能させる場合の動作を説明する。
オーディオシステム100において、オーディオアンプ10をメインアンプとして機能させる場合の動作を説明する。
以上のように、本実施の形態のオーディオアンプ10は、プリアンプ、プリメインアンプ、メインアンプそれぞれの機能に切り替えて動作することができる。本願発明者らは、このようにアンプ装置のアンプ機能を切り替えた場合、スピーカから出力される音声の音量について、以下のような課題が生じ得ることを発見した。
ボリュームつまみ13の位置は、アナログ信号(例えば、アナログ電圧)として与えられる。マイクロコントローラ20には、このアナログ信号が入力される。マイクロコントローラ20は、AD変換器21により、入力されたアナログ信号をデジタル値(以下「A/D値」という)に変換する。そして、マイクロコントローラ20は、A/D値に基づき、音量設定値を決定する。
以上のように、本実施の形態のオーディオアンプ10は、音量調整が可能なプリアンプ機能またはプリメインアンプ機能(第1のアンプ機能の一例)と、音量調整が不可能なメインアンプ機能(第2のアンプ機能の一例)とを切り替えるように構成されたアンプ装置である。オーディオアンプ10は、音声信号を入力する入力端子31~33と、音量を設定するためにユーザにより操作されるボリュームつまみ13(操作部材の一例)と、ボリュームつまみ13で設定された音量の設定値を記憶するメモリ22(記憶部の一例)と、ボリュームつまみ13で設定された音量が得られるように入力端子を介して入力した音声信号を増幅するDSP26(信号処理回路の一例)と、DSP25を制御するマイクロコントローラ20と、を備える。
以上のように、本出願において開示する技術の例示として、実施の形態1を説明した。しかしながら、本開示における技術は、これに限定されず、適宜、変更、置き換え、付加、省略などを行った実施の形態にも適用可能である。また、上記実施の形態1で説明した各構成要素を組み合わせて、新たな実施の形態とすることも可能である。そこで、以下、他の実施の形態を例示する。
13 ボリュームつまみ(操作部材)
15 入力セレクタ
20 マイクロコントローラ(制御部)
21 AD変換器
22 メモリ(記憶部)
24 音量制御回路
25 DSP(信号処理回路)
26 モータ(駆動部)
28 入力切替回路
31~33 入力端子
34,35 出力端子
50 AVセレクタ
41~44 音声再生装置
61R,61L,63SL,63SR,63SB,63SW スピーカ
100 オーディオシステム
Claims (7)
- 音量調整が可能な第1のアンプ機能と、音量調整が不可能な第2のアンプ機能とを切り替えるように構成されたアンプ装置であって、
音量の設定を受け付け、前記音量に応じて状態が変化する操作部材と、
前記操作部材で設定された前記音量が得られるように、入力された音声信号を増幅する信号処理回路と、
前記信号処理回路を制御する制御部と、を備え、
前記制御部は、
前記第1のアンプ機能の実行中において、前記操作部材で設定された前記音量が得られるように前記信号処理回路の増幅動作を制御し、
前記第1のアンプ機能から前記第2のアンプ機能へ切り替えられ、さらにその後、前記第1のアンプ機能に切り替えられた時に、前記操作部材の前記状態が、前記第1のアンプ機能から前記第2のアンプ機能へ切り替えられる直前に出力された第1音量よりも大きな第2音量に対応する前記状態である場合は、前記操作部材の前記状態を、前記第2音量よりも小さな第3音量に対応する前記状態に変化させ、前記信号処理回路の前記増幅動作を制御して、前記第3音量を出力させるように構成された、アンプ装置。 - 前記操作部材で設定された前記音量を記憶する記憶部をさらに備え、
前記第3音量は前記第1音量と等しい、
請求項1記載のアンプ装置。 - 前記制御部は、
前記第1のアンプ機能から前記第2のアンプ機能へ切り替えられ、さらにその後、前記第1のアンプ機能に切り替えられた時に、前記操作部材の前記状態が、前記第1音量よりも小さな第4音量に対応する前記状態である場合は、前記操作部材の前記状態を変化させず、前記信号処理回路の前記増幅動作を制御して、前記第4音量を出力させるように構成された、
請求項1記載のアンプ装置。 - 前記操作部材は、回転またはスライド移動することで前記状態が変化するように構成され、
前記アンプ装置は、前記操作部材を回転またはスライド移動させる駆動部をさらに備え、
前記制御部は、前記駆動部を制御し、前記操作部材を、前記第2音量から前記第3音量に対応する前記状態に回転またはスライド移動させるように構成された、
請求項1記載のアンプ装置。 - 前記音声信号を外部から入力する複数の入力端子と、
前記複数の入力端子の中から所望の入力端子を選択するために操作される入力セレクタと、をさらに備え、
前記制御部は、前記入力セレクタによる前記所望の入力端子の選択に応じて、前記第1のアンプ機能と前記第2のアンプ機能を切り替えるように構成された、
請求項1記載のアンプ装置。 - 前記第1のアンプ機能は前記音声信号の信号レベルを増幅する機能であり、前記第2のアンプ機能は前記音声信号の電力を増幅する機能である、請求項1記載のアンプ装置。
- 前記操作部材が受け付けた前記操作をデジタル値に変換するアナログ・デジタル変換器をさらに備え、
前記制御部は、前記デジタル値を所定範囲毎に前記音量の設定値に変換し、
前記制御部は、前記所定範囲の上限または下限を、変換された前記デジタル値の変化方向に応じてシフトさせ、
前記制御部は、ユーザによる前記操作部材の操作が停止したときに、前記所定範囲の前記上限または前記下限をシフトさせる、
請求項1記載のアンプ装置。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2019508640A JP6872695B2 (ja) | 2017-03-31 | 2018-01-29 | アンプ装置 |
EP18775268.8A EP3605841B1 (en) | 2017-03-31 | 2018-01-29 | Amplification device |
US16/440,131 US10763801B2 (en) | 2017-03-31 | 2019-06-13 | Amplification device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017-071323 | 2017-03-31 | ||
JP2017071323 | 2017-03-31 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/440,131 Continuation US10763801B2 (en) | 2017-03-31 | 2019-06-13 | Amplification device |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2018179783A1 true WO2018179783A1 (ja) | 2018-10-04 |
Family
ID=63674881
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2018/002744 WO2018179783A1 (ja) | 2017-03-31 | 2018-01-29 | アンプ装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US10763801B2 (ja) |
EP (1) | EP3605841B1 (ja) |
JP (1) | JP6872695B2 (ja) |
WO (1) | WO2018179783A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11625218B2 (en) * | 2020-04-07 | 2023-04-11 | Ricoh Company, Ltd. | Sound output device, sound output system, and output sound control method with appropriately controllable volume, and recording medium |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5530923A (en) * | 1994-03-30 | 1996-06-25 | Nokia Mobile Phones Ltd. | Dual mode transmission system with switched linear amplifier |
JP2003309892A (ja) * | 2002-04-12 | 2003-10-31 | Mitsubishi Electric Corp | スピーカ出力装置 |
JP2005244684A (ja) * | 2004-02-27 | 2005-09-08 | Canon Inc | 画像表示装置 |
JP2006340026A (ja) * | 2005-06-02 | 2006-12-14 | Alpine Electronics Inc | 音量調整装置、これを備えたオーディオ装置及び音量調整方法 |
JP2007166557A (ja) | 2005-12-16 | 2007-06-28 | Rinnai Corp | オーディオ装置 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56169405A (en) * | 1980-05-31 | 1981-12-26 | Sony Corp | Level adjuster |
JPH08316750A (ja) * | 1995-05-16 | 1996-11-29 | Matsushita Electric Ind Co Ltd | オーディオ再生装置 |
US6249322B1 (en) * | 1996-10-02 | 2001-06-19 | Sony Corporation | TV receiver, method of setting reception channel, and picture display method |
JP2002095083A (ja) * | 2000-09-19 | 2002-03-29 | Sharp Corp | 情報処理装置及び情報処理装置のオーディオ信号制御方法並びにその制御プログラムを記録したコンピュータ読み取り可能な記録媒体 |
US7191024B2 (en) * | 2000-11-02 | 2007-03-13 | Yamaha Coproration | Remote control method and apparatus, remote controller, and apparatus and system based on such remote control |
US7782400B2 (en) * | 2003-12-18 | 2010-08-24 | Mitsubishi Denki Kabushiki Kaisha | Image display controller and image display system |
JP2008053985A (ja) * | 2006-08-24 | 2008-03-06 | Funai Electric Co Ltd | オーディオ装置 |
JP5777154B2 (ja) * | 2011-06-24 | 2015-09-09 | 埼玉日本電気株式会社 | 携帯端末装置 |
JP5867187B2 (ja) * | 2012-03-09 | 2016-02-24 | ヤマハ株式会社 | 音響信号処理システム |
JP6409512B2 (ja) * | 2014-04-14 | 2018-10-24 | ヤマハ株式会社 | オーディオ機器およびオーディオシステム |
JP6451596B2 (ja) * | 2015-10-30 | 2019-01-16 | ヤマハ株式会社 | オーディオ装置およびオーディオ機器 |
-
2018
- 2018-01-29 EP EP18775268.8A patent/EP3605841B1/en active Active
- 2018-01-29 JP JP2019508640A patent/JP6872695B2/ja active Active
- 2018-01-29 WO PCT/JP2018/002744 patent/WO2018179783A1/ja active Application Filing
-
2019
- 2019-06-13 US US16/440,131 patent/US10763801B2/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5530923A (en) * | 1994-03-30 | 1996-06-25 | Nokia Mobile Phones Ltd. | Dual mode transmission system with switched linear amplifier |
JP2003309892A (ja) * | 2002-04-12 | 2003-10-31 | Mitsubishi Electric Corp | スピーカ出力装置 |
JP2005244684A (ja) * | 2004-02-27 | 2005-09-08 | Canon Inc | 画像表示装置 |
JP2006340026A (ja) * | 2005-06-02 | 2006-12-14 | Alpine Electronics Inc | 音量調整装置、これを備えたオーディオ装置及び音量調整方法 |
JP2007166557A (ja) | 2005-12-16 | 2007-06-28 | Rinnai Corp | オーディオ装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP3605841A4 |
Also Published As
Publication number | Publication date |
---|---|
US20190296702A1 (en) | 2019-09-26 |
EP3605841B1 (en) | 2024-05-01 |
EP3605841A1 (en) | 2020-02-05 |
EP3605841A4 (en) | 2020-02-26 |
JPWO2018179783A1 (ja) | 2019-11-07 |
JP6872695B2 (ja) | 2021-05-19 |
US10763801B2 (en) | 2020-09-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP2012054857A (ja) | 制御端末装置、制御方法 | |
WO2018179783A1 (ja) | アンプ装置 | |
JP4347292B2 (ja) | オーディオ装置 | |
US10680640B2 (en) | Power-saving current-mode digital-to-analog converter (DAC) | |
US10425731B2 (en) | Audio processing apparatus, audio processing method, and program | |
US10128806B2 (en) | Method of controlling an audio amplifier unit and audio amplifier unit | |
JP2019014271A (ja) | 制御装置、制御システム及び制御方法 | |
JP5488478B2 (ja) | 音声処理装置 | |
JP5477397B2 (ja) | 音声処理装置 | |
JP6477633B2 (ja) | 音楽再生装置 | |
JP2021057096A (ja) | 音楽再生装置 | |
JPH098574A (ja) | 音量調整装置 | |
US9941854B2 (en) | Music reproducing device | |
EP3133836B1 (en) | Music reproducing device | |
JP5477402B2 (ja) | 音声処理装置 | |
JP6547546B2 (ja) | 音楽再生装置 | |
JP4352176B2 (ja) | マルチチャンネル再生システム、それに用いられる音源装置、及び増幅装置 | |
JP2005018860A (ja) | オーディオ再生装置 | |
JP4285507B2 (ja) | オートゲインコントロール回路 | |
JP2023094567A (ja) | マルチゾーン音響制御システムおよび方法 | |
JP2020184707A (ja) | 音楽再生装置 | |
JP6241316B2 (ja) | 音声処理装置 | |
KR20030067250A (ko) | 기록 매체의 오디오 출력 장치 및 방법 | |
JP3332219B2 (ja) | 音場拡大装置 | |
JP2014086099A (ja) | 光ディスク装置およびその制御方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 18775268 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2019508640 Country of ref document: JP Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2018775268 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2018775268 Country of ref document: EP Effective date: 20191031 |