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JP2014049856

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DESCRIPTION JP2014049856
Abstract: A versatile amplifier unit capable of flexibly coping with various recording scenes and a
portable electronic device provided with the same. An amplifier unit (10) has microphone / line
input terminals (16, 18) on the top and left sides, respectively. When the connector 12 is
connected to a portable electronic device, stereo recording is performed using the terminal 16
when the portable electronic device is to be vertically oriented and using the terminal 18 when
the portable electronic device is to be laterally oriented. The audio signals from the terminals 16
and 18 can be switched to monaural / stereo, respectively. [Selected figure] Figure 2
Amplifier unit and portable electronic device provided with the same
[0001]
The present invention relates to an amplifier unit and a portable electronic device provided with
the same.
[0002]
BACKGROUND In recent years, multifunctional mobile electronic devices such as mobile phones,
tablet terminals, PDAs, etc. are widely used.
Such portable electronic devices may be used for recording and recording applications. However,
many portable electronic devices are not dedicated to recording (recording), and thus often do
not have a microphone suitable for recording. Therefore, stereo microphone devices have been
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proposed that can be suitably attached to such portable electronic devices.
[0003]
On the other hand, various microphone devices or stereo input / output devices are also known,
although they are not stereo microphone devices particularly attached to portable electronic
devices.
[0004]
In Patent Document 1, the L channel input terminal and the R channel input terminal are
arranged in the same plane, and when both are connected, they are input / output as a stereo
balanced signal, and when only one is connected, stereo A stereo input / output device is
disclosed that performs input / output as an unbalanced signal.
[0005]
Patent Document 2 discloses a sound collection device capable of changing the direction of the
microphone according to the application, and disclosed switching between stereo recording and
monaural recording according to the position of the microphone relative to the sound collection
device main body. .
[0006]
JP 07-288162 JP JP 2006-033615 JP
[0007]
In order to improve the sound quality of the stereo microphone device attached to the portable
electronic device, an amplifier unit having an analog-digital converter, an input volume capable
of adjusting the input level, etc. and capable of appropriately connecting an external stereo
device can be considered. In consideration of being attached to a portable electronic device, the
flexibility which can respond to various recording scenes is desired.
[0008]
An object of the present invention is to provide a highly versatile amplifier unit capable of
flexibly coping with various recording scenes and a portable electronic device provided with the
same.
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[0009]
In the amplifier unit of the present invention, respective audio signals from the first and second
audio signal input terminals formed on at least two different surfaces and the first and second
audio signal input terminals are monaural audio signals. It is possible to switch between stereo
and stereo signals, and when it is a monaural audio signal, a stereophonic audio signal from the
first audio signal input terminal and a monaural audio signal from the second audio signal input
terminal are paired. It is characterized by comprising switching means for converting into an
audio signal, analog-to-digital converting means for converting an audio signal from the
switching means into a digital audio signal, and output means for outputting the digital audio
signal.
[0010]
In one embodiment of the present invention, the apparatus further comprises level adjusting
means for adjusting the input level of each of the audio signals from the first and second audio
signal input terminals, the level adjusting means frictionally engaging each other. First and
second operating knobs that rotate about the same axis, the first operating knob adjusts the input
level of the audio signal from the first audio signal input terminal, and the second operating knob
controls the second audio signal If the input level of the audio signal from the input terminal is
adjusted and one operation knob is rotated, the other operation knob is also interlocked and
rotated accordingly, and if one operation knob is fixed, the other operation knob is It is
characterized in that it can be independently rotated.
[0011]
Another embodiment of the present invention is further characterized by comprising a connector
for connecting to a portable electronic device.
[0012]
The amplifier unit of the present invention can be incorporated into a portable electronic device
such as a portable telephone, a portable information terminal, or a digital camera, and the
present invention includes such portable electronic device.
[0013]
According to the present invention, it is possible to obtain a highly versatile amplifier unit that
can flexibly cope with various recording scenes and a portable electronic device provided with
the same.
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[0014]
It is an appearance perspective view of an amplifier unit in an embodiment.
They are a top view (A), a left side view (B), and a top view (C) of an amplifier unit in an
embodiment.
It is connection explanatory drawing of the external microphone apparatus at the time of making
a portable electronic device vertical.
It is connection explanatory drawing of the external microphone apparatus at the time of making
a portable electronic device sideways.
It is connection explanatory drawing in the case of carrying out stereo recording using two
microphone apparatuses.
It is a circuit block diagram of the amplifier unit in embodiment.
It is interlocking | linkage / independent explanatory drawing of an input volume.
It is an exploded perspective view of an input volume.
It is an exploded perspective view of an input volume.
It is a block diagram of a changeover switch.
[0015]
Hereinafter, embodiments of the present invention will be described based on the drawings.
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[0016]
FIG. 1 is an external perspective view of an amplifier unit 10 according to the present
embodiment.
The amplifier unit 10 has a generally rectangular parallelepiped shape as a whole and has six
sides.
A connector 12 is formed on the bottom of the amplifier unit 10, and can be connected to a
portable electronic device 100 such as a portable telephone, a tablet terminal, a portable
information terminal, a digital camera or the like.
[0017]
The amplifier unit 10 is provided with a plurality of audio signal input terminals for connecting
external microphones and various musical instruments.
The plurality of audio signal input terminals are formed on at least two different surfaces of the
six surfaces of the amplifier unit 10, and are provided on the upper surface and the left surface
in this embodiment. In these audio signal input terminals, jacks of external microphones are
inserted, or line jacks for inputting audio signals from various musical instruments such as a
guitar and a drum are inserted. Hereinafter, these audio signal input terminals are referred to as
microphone / line input terminals as meaning terminals for inputting either a microphone or a
line.
[0018]
Further, an input volume 14 for adjusting the level of the audio signal input from the microphone
/ line input terminal is provided at a predetermined position of the amplifier unit 10, that is, at
the front right corner. The input volume 14 is composed of two dial type knobs, and the two dial
type knobs basically correspond to each of two microphone / line input terminals, and the user
operates this input volume 14 Thus, the level of the audio signal input from the microphone /
line input terminal can be appropriately adjusted.
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[0019]
Further, on the back of the amplifier unit 10, a switch for switching the microphone / line input
terminal is provided. This switch comprises an input terminal switch for selectively switching
between two microphone / line input terminals, and a mode changeover switch for switching
between monaural / stereo.
[0020]
As described later, the amplifier unit 10 includes an ADC (analog-digital conversion circuit) and
an audio signal processing circuit, converts an audio signal input from a microphone or a line
into a digital signal, and is connected via a connector The digital audio signal is output to the
portable electronic device 100.
[0021]
An example of a portable electronic device is a smart phone of a multifunctional mobile phone,
which connects the amplifier unit 10 to the smart phone and supplies a digital voice signal from
the amplifier unit 10 to the smart phone via a connector.
In the smartphone, the digital audio signal from the amplifier unit 10 can be recorded by being
recorded in the built-in memory or the like. When the smartphone has a moving image shooting
function, it is possible to capture a moving image on the smartphone side, capture a digital audio
signal from the amplifier unit 10, and record audio together with the moving image.
[0022]
FIG. 2 shows an appearance configuration of the amplifier unit 10. In the drawings, (A) is a top
view, (B) is a left side view, and (C) is a plan view. As shown in (A), a microphone / line input
terminal 16 is provided on the upper surface of the amplifier unit 10. In the figure, the
microphone / line input terminal 16 is provided offset to the left from the approximate center of
the upper surface, but the formation position is adjusted due to the internal structure of the
amplifier unit 10, and the microphone / line input terminal 16 is The line input terminal 16 may
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be provided at the center position of the front. Further, as shown in (B), another microphone /
line input terminal 18 is provided on the left side surface of the amplifier unit 10. The position of
the microphone / line input terminal 18 may be arbitrary as well as the microphone / line input
terminal 16. As a result of the microphone / line input terminal 16 being provided on the upper
surface of the amplifier unit 10 and the microphone / line input terminal 18 being provided on
the left side surface of the amplifier unit 10, as shown in FIG. The microphone / line input
terminal 16 is present above the amplifier unit 10, and the microphone / line input terminal 18
is also present on the left side of the amplifier unit 10. The user can insert an external
microphone jack or line jack into either the microphone / line input terminal 16 or the
microphone / line input terminal 18. Also, the user can insert an external microphone jack or a
line jack into any of the microphone / line input terminal 16 and the microphone / line input
terminal 18.
[0023]
An example of the operation state which connected the amplifier unit 10 to the portable
electronic device 100 in FIG. 3 is shown. This is a case where a moving image is captured by
holding the portable electronic device 100 in the vertical direction. In this case, the user inserts
the jack of the external stereo microphone 50 into the microphone / line input terminal 16 of the
amplifier unit 10 in consideration of the fact that the portable electronic device 100 is vertically
oriented. The external microphone 50 includes a microphone unit for R channel and a
microphone unit for L channel, and inputs a stereo signal by collecting left and right sounds with
both microphone units. When the jack of the external stereo microphone 50 is inserted into the
microphone / line input terminal 16 of the amplifier unit 10, the microphone unit for the R
channel of the external microphone 50 and the L channel are just when the user holds the
portable electronic device 100 in the vertical direction. The microphone unit is positioned to the
left and right with respect to the sound collection object, and sound can be collected at the stereo
normal position.
[0024]
On the other hand, FIG. 4 shows another example of the operation state in which the amplifier
unit 10 is connected to the portable electronic device 100. This is a case where the mobile
electronic device 100 is held sideways to shoot a moving image. When holding and operating the
portable electronic device 100 in the vertical direction, the user can pick up sound at the stereo
position by attaching the external stereo microphone 50 to the microphone / line input terminal
16 as described above, When the portable electronic device 100 is turned sideways with the
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external stereo microphone 50 attached to the microphone / line input terminal 16, the R
channel microphone unit and the L channel microphone unit of the external microphone 50 are
vertically disposed. However, this can not be picked up at the stereo normal position.
[0025]
Therefore, as shown in the figure, the external stereo microphone 50 is attached to the
microphone / line input terminal 18. When the portable electronic device 100 is gripped
sideways, the left side surface of the amplifier unit 10 connected to the portable telephone device
100 is on the upper side, and by attaching to the microphone / line input terminal 18 provided
on the left side surface of the amplifier unit 10, The microphone unit for the R channel of the
external stereo microphone 50 and the microphone unit for the L channel are disposed on the
left and right, and sound can be collected at a fixed position in stereo.
[0026]
As described above, the portable electronic device 100 to which the amplifier unit 10 is
connected is provided by providing the microphone / line input terminal 16 on the upper surface
of the amplifier unit 10 and providing the microphone / line input terminal 18 on the left side of
the amplifier unit 10. Since the microphone / line input terminal 16 provided on the upper
surface of the amplifier unit 10 faces upward when vertically holding, the stereo sound pickup
becomes possible by attaching the external stereo microphone 50 here, and on the other hand,
When holding the portable electronic device 100 to which the amplifier unit 10 is connected
sideways, the microphone / line input terminal 18 provided on the left side of the amplifier unit
10 faces upward, so the external stereo microphone 50 is attached here This enables stereo
sound collection. That is, even when the user holds the portable electronic device 100 in either
the horizontal or vertical direction, stereo sound collection and stereo recording can be
performed using the amplifier unit 10.
[0027]
Furthermore, in the present embodiment, an external microphone is not attached to either the
microphone / line input terminal 16 or the microphone / line input terminal 18, but an external
microphone is attached to the microphone / line input terminal 16 and the microphone / line
input terminal 18, respectively. It is also possible to wear
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[0028]
FIG. 5 shows an example of the operation state in this case.
The external stereo microphone 52 is attached to the microphone / line input terminal 16, and
the external stereo microphone 52 is attached to the microphone / line input terminal 18. In this
case, the amplifier unit 10 processes the audio signal from the microphone / line input terminal
16 not as a stereo signal but as a monaural signal, and processes the audio signal from the
microphone / line input terminal 18 as a monaural signal instead of a stereo signal Do. Then, the
monaural signal from the microphone / line input terminal 16 and the monaural signal from the
microphone / line input terminal 18 are processed as a stereo signal as a pair. For example, in
the figure, the monaural signal from the microphone / line input terminal 16 is an R channel
signal, the monaural signal from the microphone / line input terminal 18 is an L channel signal,
and both signals are processed as a stereo signal as a pair.
[0029]
As described above, by forming a stereo signal from the audio signal from the microphone / line
input terminal 16 and the audio signal from the microphone / line input terminal 18, various and
flexible stereo sound collection becomes possible. That is, for example, even when the sound
source exists at a position where stereo sound can not be picked up by the external stereo
microphone 50 attached to the microphone / line input terminal 18, the external stereo
microphone attached to the microphone / line input terminal 16 as shown in FIG. By collecting
sound with the external stereo microphone 52 attached to the microphone 52 and the
microphone / line input terminal 18, stereo sound collection can be enabled. Of course, by
independently changing or adjusting the directivity of the external stereo microphone 52
attached to the microphone / line input terminal 16 and the external stereo micro-book 52
attached to the microphone / line input terminal 18, It is possible to collect sound from sound
sources of various positions in combination with the fact that the distance can be secured.
[0030]
The microphone / line input terminal 16 and the microphone / line input terminal 18 function as
terminals for inputting a stereo signal when the external stereo microphone 50 is attached to
either one, but the external stereo microphone 52 is connected to both of them. When installed,
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they function as terminals for inputting monaural signals, and both function as a pair of
terminals for inputting stereo signals. However, such monaural / stereo switching is performed
using an amplifier The processor in the unit 10 may automatically detect and carry out the
process, or the user may switch manually with a changeover switch provided in the amplifier unit
10. In the present embodiment, a configuration will be described in which the user switches the
functions of the microphone / line input terminal 16 and the microphone / line input terminal 18
by operating the input terminal changeover switch and the mode changeover switch provided on
the back of the amplifier unit 10.
[0031]
FIG. 6 shows a circuit configuration diagram of the amplifier unit 10. The amplifier unit 10
includes microphone / line input terminals 16 and 18, an input volume 14, an input terminal
switching switch 20, a mode switching switch 22, switches SW1 to SW4, input volume switches
Vol1 to 4, a signal bus 10a, an analog digital conversion circuit ADC) 10 b, digital signal
processor (DSP) 10 c, and interface (I / F) 10 d.
[0032]
The microphone / line input terminal 16 is connected to one of the contacts of SW1. Also, the
microphone / line input terminal 18 is connected to one of the contacts of SW2.
[0033]
SW1 and SW2 are interlocked with the input terminal selector switch 20 provided on the back of
the amplifier unit 10, and when the user operates the input terminal selector switch 20 to switch
to the microphone / line input terminal 16 side, The switch SW1 is switched to the contact on the
microphone / line input terminal 16 side, while the switch SW2 is switched to the contact on the
off side. Also, when the user operates the input terminal changeover switch 20 to switch to the
microphone / line input terminal side 18, SW1 switches to the contact on the off side, while SW2
is the contact on the microphone / line input terminal 18 side Switch to The drawing shows the
case where the user operates the input terminal changeover switch 20 to select the microphone /
line input terminal 16, and the switch SW1 is on and the switch SW2 is off.
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[0034]
The audio signal from SW1 is separated into an R channel audio signal and an L channel audio
signal, the R channel audio signal is supplied to signal bus 10a through Vol1, and the L channel
audio signal is signal bus 10a through SW3 and Vol2. Supplied to
[0035]
Also, the audio signal from SW2 is separated into an R channel audio signal and an L channel
audio signal, the R channel audio signal is supplied to the signal bus 10a via SW4 and Vol4, and
the L channel audio signal is delivered via Vol3. It is supplied to the bus 10a.
[0036]
SW3 and SW4 are interlocked with the mode switch 22 provided on the back of the amplifier
unit 10. When the user switches the mode switch 22 to the stereo side, both SW3 and SW4 are
turned on to switch the mode switch 22. When switching to the monaural side, both SW3 and
SW4 turn off.
When the switch SW3 is turned on, both the R channel audio signal and the L channel audio
signal from the microphone / line input terminal 16 are supplied to the signal bus 10a via Vol1
and Vol2.
Further, when the SW 4 is turned on, both the R channel audio signal and the L channel audio
signal from the microphone / line input terminal 18 are supplied to the signal bus 10 a through
Vol 3 and 4. When both SW3 and SW4 are turned off, only the R channel audio signal from the
microphone / line input terminal 16 is supplied to the signal bus 10a via VO11, and only the L
channel audio signal from the microphone / line input terminal 18 is Vol3. It is supplied to the
signal bus 10a via These two monaural signals are processed as a stereo audio signal as a pair.
[0037]
The input terminal changeover switch 20 and the mode changeover switch 22 can be configured
as switches independent of each other, but can also be configured as switches interlocking with
each other. Specifically, when the input terminal changeover switch 20 is set to either of the
microphone / line input terminals 16 and 18, the mode changeover switch 22 is disabled (one of
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the microphone / line input terminals 16 and 18 is stereo input When the mode switch 22 is set
to stereo, the input terminal switch 20 is disabled and both terminals 16 and 18 are set together
(both the microphone / line input terminals 16 and 18 are monaural Input can be set). In this
case, when either SW1 or SW2 is on, both SW3 and SW4 are on, and when both SW1 and SW2
are on, both SW3 and SW4 are off .
[0038]
FIG. 10 shows a specific example of the input terminal changeover switch 20 and the mode
changeover switch 22. The input changeover switch 20 and the mode changeover switch 22 are
configured by a single switch of three-step switching type. The slide knob 62 is disposed in the
horizontal opening 60, and the user can move the slide knob 62 in the left-right direction. When
the slide knob 62 is slid to the right end of the opening 60, the switch is set to the microphone /
line input terminal 16 side (shown as A in the figure), and when the slide knob 62 is slid to the
left end of the opening 60, the microphone / line input terminal It is switched and set on the 18
side (shown as B in the figure). On the other hand, when the slide knob 62 is slid to the center
position of the opening 60, the mode is switched to the stereo mode, and both the microphone /
line input terminal 16 and the microphone / line input terminal 18 are set to monaural input. In
this case, the audio signal from the microphone / line input terminal 16 is processed as an R
channel signal, and the audio signal from the microphone / line input terminal 18 is processed as
an L channel audio signal (in FIG. Shown as L on the side).
[0039]
Returning to FIG. 6 again, Vol1 to Vol4 are interlocked with the input volume 14 provided in the
amplifier unit 10, and adjust the level of the input audio signal. The input volume 14 is composed
of two volume knobs, the first volume knob drives Vol 1 and 2 and the second volume knob
drives Vol 3 and 4. However, in a normal state, the two volume knobs rotate in conjunction with
each other, and for this reason, Vol1 to Vol4 interlock with each other to adjust the level of the
audio signal. On the other hand, the two volume knobs can be independently rotated without
being interlocked with each other. In this case, Vo1, 2 and Vol3, 4 individually adjust the level of
the audio signal. The configuration of the input volume 14 will be further described later.
[0040]
The ADC 10 b converts the stereo audio signal from the signal bus 10 a into a digital signal and
outputs the digital signal to the DSP 10 c.
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[0041]
The DSP 10 c performs equalizer processing (may perform effect processing and the like) on the
digital stereo sound signal to adjust the sound quality, and outputs the sound through the I / F
10 d.
[0042]
The I / F 10 d constitutes a part of the connector 12 and outputs the digital stereo audio signal
processed by the DSP 10 c to the portable electronic device 100.
[0043]
Next, the operation of the circuit configuration as described above will be described.
[0044]
<When the User Attaches an External Stereo Microphone to the Microphone / Line Input
Terminal 16> In this case, the user switches the input terminal changeover switch 20 to the
microphone / line input terminal 16 side.
Then, SW1 turns on and SW2 turns off, and stereo audio signals from the microphone / line
input terminal 16, that is, R channel audio signals and L channel audio signals are input.
At this time, SW3 is basically turned on.
When the user operates the input volume 14, the levels of the R channel audio signal and the L
channel audio signal are adjusted in Vol 1 and Vol 2 and supplied to the signal bus 10a.
The ADC 10 b converts the stereo audio signal into a digital signal to generate a digital stereo
audio signal, and supplies the digital stereo audio signal to the DSP 10 c. The DSP 10 c equalizes
the digital stereo audio signal and outputs it to the portable electronic device 100 through the I /
F 10 d. The user can record the high-quality digital stereo audio signal output from the amplifier
unit 10 by operating the portable electronic device 100.
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[0045]
<When the User Attaches an External Stereo Microphone to the Microphone / Line Input
Terminal 18> In this case, the user switches the input terminal changeover switch 20 to the
microphone / line input terminal 18 side. Then, SW1 is turned off, SW2 is turned on, and stereo
audio signals from the microphone / line input terminal 18, that is, R channel audio signal and L
channel audio signal are input. At this time, SW4 is basically turned on. When the user operates
the input volume 14, the levels of the R channel audio signal and the L channel audio signal are
adjusted at Vol 3 and 4 and supplied to the signal bus 10a. The ADC 10 b converts the stereo
audio signal into a digital signal to generate a digital stereo audio signal, and supplies the digital
stereo audio signal to the DSP 10 c. The DSP 10 c equalizes the digital stereo audio signal and
outputs it to the portable electronic device 100 through the I / F 10 d. The user can record the
high-quality digital stereo audio signal output from the amplifier unit 10 by operating the
portable electronic device 100.
[0046]
<When the User Attaches an External Stereo Microphone to the Microphone / Line Input
Terminal 16 and Attaches the External Stereo Microphone to the Microphone / Line Input
Terminal 18> In this case, the user turns the input terminal changeover switch 22 to the stereo
side. Switch. Then, both SW1 and SW2 are turned on, and both SW3 and SW4 are turned off. Of
the R channel audio signal and L channel audio signal from the microphone / line input terminal
16, only the R channel audio signal is level-adjusted at Vol 1 and supplied to the signal bus 10a.
Further, of the R channel audio signal and L channel audio signal from the microphone / line
input terminal 18, only the L channel audio signal is level-adjusted by VO13 and supplied to the
signal bus 10a. When monaural microphones are attached to the microphone / line input
terminals, the audio signals are respectively R-channel audio signals from the microphone / line
input terminals 16 and L-channel audio signals from the microphone / line input terminals 18. It
is input. The ADC 10 b converts the R channel audio signal from the microphone / line input
terminal 16 and the L channel audio signal from the microphone / line input terminal 18 into
digital signals to generate digital stereo audio signals, and supplies the digital stereo audio
signals to the DSP 10 c. The DSP 10 processes the digital stereo audio signal with an equalizing
process, and outputs it to the portable electronic device 100 through the I / F 10 d. The user can
record the high-quality digital stereo audio signal output from the amplifier unit 10 by operating
the portable electronic device 100.
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14
[0047]
Next, the input volume 14 of the amplifier unit 10 will be described.
[0048]
The operation of the input volume 14 is shown in FIG.
The input volume 14 is composed of two volume knobs 14A and 14B, the volume knob 14A
corresponds to Vol1 and 2 on the microphone / line input terminal 16 side, and the volume knob
14B is Vol3 and 4 on the microphone / line input terminal 18 side. Corresponds to The volume
knob 14A and the volume knob 14B are frictionally engaged with each other with a constant
frictional force, and when one volume knob is rotated, the other volume knob is also rotated
correspondingly. Therefore, as shown in (A), when the volume knob 14A is rotated, the volume
knob 14B is also rotated in the same direction in conjunction with this, and when the volume
knob 14B is rotated, the volume knob 14A is also synchronized in the same direction. Rotate in
the direction.
[0049]
When the user attaches an external stereo microphone to the microphone / line input terminal
16, basically, the user operates the volume knob 14A corresponding to Vol1 and Vol2 on the
microphone / line input terminal 16 side to adjust the input level. However, as described above,
since the volume knobs 14A and 14B frictionally engage with each other and interlock and
rotate, the user may adjust the input level by rotating either of the volume knobs 14A or 14B. it
can. The same applies to the case where an external stereo microphone is attached to the
microphone / line input terminal 18, and the user can adjust the input level by rotating either of
the volume knobs 14A or 14B.
[0050]
On the other hand, since the volume knobs 14A and 14B are frictionally engaged with a constant
frictional force, it is possible to rotate only the other volume knob while holding and fixing one of
the volume knobs, in this case The two volume knobs 14A and 14B rotate independently of each
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15
other without interlocking. (B) shows this state. When the volume knob 14B is rotated in a state
where the volume knob 14A is pressed and fixed with a finger, only the volume knob 14B is
rotated while the volume knob 14A is fixed. Then, the input level can be adjusted only with Vols
3 and 4 independently of Vols 1 and 2. Of course, when the volume knob 14A is rotated while
holding the volume knob 14B with a finger and fixed, only the volume knob 14A rotates while
the volume knob 14B is fixed, and independently of Vol3 and Vol4, Vol1 and Vol2. The input
level is adjusted with
[0051]
This means that the level of the audio signal from the microphone / line input terminal 16 and
the level of the audio signal from the microphone / line input terminal 18 can be adjusted
independently of each other, and the levels of both audio signals are interlocked by the same
amount. It means that it can be adjusted. This function is particularly effective when the R
channel audio signal from the microphone / line input terminal 16 and the L channel audio
signal from the microphone / line input terminal 18 are paired to form a stereo signal. That is,
when the user mounts an external stereo microphone to the microphone / line input terminals
16 and 18 and performs stereo recording, the user fixes the volume knob 14A and rotates only
the volume knob 14B to operate the microphone / line input terminal. Only the level of the L
channel audio signal from 18 can be increased or decreased with respect to the R channel audio
signal to adjust the balance between the two. Thereafter, by rotating the volume knobs 14A and
14B in conjunction with each other, the overall level can be easily increased or decreased while
maintaining the balance between the two.
[0052]
8 and 9 show exploded perspective views of the input volume 14 viewed from different
directions. As shown in FIGS. 8 and 9, the input volume 14 comprises volume knobs 14A, 14B
and a collar 15. The volume knob 14A, the collar 15, and the volume knob 14B are attached to
the axis of the two-axis volume switch in this order. That is, the first axis of the two-axis volume
switch corresponds to Vol1 and Vol2, and the shaft hole of the volume knob 14A is fitted and
attached to this first axis. The second axis of the two-axis volume switch corresponds to Vol 3
and 4, and the shaft hole of the volume knob 14B is fitted and attached to this second axis. Key
grooves 14A-1 and 14A-2 are formed on the inner peripheral surface of the volume knob 14A at
positions facing each other 180 degrees. On the other hand, among the outer peripheral surface
of the collar 15, on the outer peripheral surface on the volume knob 14A side, projecting keys
15-1 and 15-2 are formed at positions facing the key grooves 14A-1 and 14A-2. When the key
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15-1 of the collar 15 is fitted in the key groove 14A-1 and the key 15-2 is fitted in the key
groove 14-2, the volume knob 14A and the collar 15 are engaged, and the volume knob 14A and
The collars 15 rotate in conjunction with one another.
[0053]
On the other hand, among the outer peripheral surface of the collar 15, a plurality of ribs 15-3
are formed at equal intervals in the axial direction of the volume switch on the outer peripheral
surface on the volume knob 14B side. The ribs 15-3 abut on the inner circumferential surface
14B-1 of the volume knob 14B, and frictionally engage with the inner circumferential surface
14B-1 of the volume knob 14B.
[0054]
The volume knob 14A and the collar 15 are engaged by the key grooves 14A-1 and 14A-2 and
the keys 15-1 and 15-2, and the collar 15 and the volume knob 14B are formed by the rib 15-3
and the inner circumferential surface 14B- As a result, the volume knob 14 A and the volume
knob 14 B frictionally engage with each other via the collar 15.
[0055]
When the user rotates the volume knob 14A, the collar 15 rotates in conjunction with the
rotation of the volume knob 14A, and the volume 14B also rotates in conjunction with the
rotation of the collar 15.
Similarly, when the user rotates the volume knob 14B, the collar 15 rotates in conjunction with
the rotation of the volume knob 14B, and the volume 14A also rotates in conjunction with the
rotation of the collar 15. Therefore, both the first axis and the second axis of the volume switch
rotate in conjunction with each other, and Vol1, 2 and Vol3, 4 interlock with each other to adjust
the input level.
[0056]
When the user rotates the volume knob 14A while pressing and fixing the volume knob 14B with
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a finger, the collar 15 rotates in conjunction with the rotation of the volume knob 14A, but the
collar 15 and the volume knob 14B are frictionally engaged Therefore, even if the collar 15
rotates, the rib 15-3 just rubs while touching the inner peripheral surface 14B-1 of the volume
knob 14B, and the volume knob 14B does not rotate. Therefore, only the first axis of the volume
switch rotates, and only Vol1 and Vol2 adjust the input level.
[0057]
When the user rotates the volume knob 14B while pressing and fixing the volume knob 14A with
a finger, only the volume knob 14B rotates, the collar 15 does not rotate, and the volume knob
14A also does not rotate. Therefore, only the second axis of the volume switch rotates, and only
Vols 3 and 4 adjust the input level.
[0058]
The input volume 14 of this embodiment is configured to engage the two volume knobs 14A and
14B via the collar 15, and the volume knob is miniaturized in response to the request for
miniaturization of the amplifier unit 10, and the volume knobs 14A and 14B are Even if it
becomes difficult to process the inner circumferential surface, the frictional engagement can be
realized without being restricted by the material.
[0059]
As described above, in the present embodiment, the microphone / line input terminals 16 and 18
are provided on different sides of the amplifier unit 10, and the audio signal from each terminal
is processed as monaural or processed as a stereo signal. Because of this configuration, highquality stereo audio signals can be reliably output regardless of the orientation of the portable
electronic device 100 to which the amplifier unit 10 is connected.
Also, since the input volume 14 basically includes two volume knobs 14A and 14B that can be
adjusted independently although they are basically linked, monaural / of the microphone / line
input terminals 16 and 18 The input level can be adjusted adaptively according to the switching
of the stereo. That is, when any one of the microphone / line input terminals 16 and 18 is used, it
functions as an interlocking volume knob to facilitate adjustment of the input level, and when
both the microphone / line input terminals 16 and 18 are used, an independent volume Balance
adjustment of R channel and L channel can be enabled as a knob.
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[0060]
In the present embodiment, by making the volume knob 14A correspond to Vol 1 and 2 and the
volume knob 14B to correspond to Vol 3 and 4, the L channel and R channel are used only when
both the microphone / line input terminals 16 and 18 are used. By adjusting the volume knob
14A to correspond to Vol1 and 4 and the volume knob 14B to correspond to Vol2 and 3, it is
possible not only to use the microphone / line input terminals 16 and 18 together, Even when
either one is used, the balance of the L channel audio signal and the R channel audio signal may
be independently adjusted.
[0061]
Further, although the amplifier unit 10 is described as being connected to the portable electronic
device 100 through the connector 12 in the present embodiment, the amplifier unit 10 may be
incorporated as an amplifier unit or a module incorporated in the portable electronic device 100.
.
For example, it may be incorporated as a built-in module of a mobile phone or as a built-in
module of a digital camera. When incorporated as a built-in module of the mobile phone, the
microphone / line input terminals 16 and 18 may be provided on at least two different sides of
the mobile phone. The same applies to digital cameras. These microphone / line input terminals
16 and 18 correspond to two different operation directions of the portable electronic device, and
in the first operation direction (for example, vertical direction) and the second operation
direction (for example, horizontal direction) It is preferable to provide on the surface which
becomes an upper surface, respectively.
[0062]
10 amplifier units, 12 connectors, 14 input volumes, 16, 18 mic / line input terminals, 100
portable electronic devices.
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