[0049]
Fig. 2 is a block diagram illustrating a first exemplary
10 detailed configuration of the host device -10 and the input
device 20.
[0050]
Hereinafter, for example, a 4-pole jack and a 4-pole
plug are assumed to be employed as the jack 14 and the plug
15 23.
[0051]
In other words, the jack 14 includes two (stereo) sound
signal terminals TJl and TJ2, one microphone terminal TJ3,
and one ground terminal TJ4, and the plug 23 includes two sound
20 signal terminals TPl and TP2, one microphone terminal TP3,
and one ground terminal TP4.
[0052]
The sound signal terminals TJl, TJ2, TPl, and TP2 are
terminals for exchanging analog sound signals of two channels .
25 The sound signal terminals TJl and TPl are L (Left) channel
terminals, and the sound signal terminals TJ2 and TP2 are R
(Right) channel terminals.
[0053]
In other words, the sound signal terminal TJl is a
30 terminal that outputs the L channel sound signal, and the sound
signal terminal TJ2 is a terminal that outputs the R channel
i
16
SP353071WO00
sound signal. The sound signal terminal TPl is a terminal
that is supplied with the L channel sound signal, and the sound
signal terminal TP2 is a terminal that is supplied with the
R channel sound signal.
5 [0054}
The microphone terminals TJ3 and TP3 are terminals for
exchanging the analog sound signal obtained from a microphone
{one of microphones 810 to 8I4 {which will be described later) ,
for example, a microphone 810) .
,10 [0055]
The ground terminals TJ4 and TP4 are terminals connected
to the ground (GND).
[0056]
When the plug 23 is inserted into the jack 14, the sound
15 signal terminals TJl and TPl are connected to each other, the
sound signal terminals TJ2 and TP2 are connected to each other,
the microphone terminals TJ3 and TP3 are connected to each
other, and the ground terminals TJ4 and TP4 are connected to
each other.
20 [0057]
Here, as the existing headset, there are a driver
{headphone driver) (for example, a transducer that is
configured with a coil, a vibrating plate, and the like and
converts a sound signal into a sound {sound wave) serving as
25 air vibrations) (which is also referred to as a "speaker")
serving as a sound output unit that outputs sounds of L and
R channels and a headset that includes a microphone and a 4-pole
plug.
[0058]
30 The same plug as the 4-pole plug installed in the existing
headset may be employed as the plug 2 3, and a 4-pole jack
:&
17
SP353071WO00
corresponding to the 4-pole plug installed in the existing
headset may be employed as the jack 14.
[0059]
In this case, the plug 23 can be inserted into a jack
5 (4-pole jack} of a jack device such as an existing music player
in which an existing 4-pole headset (including a plug) can
be used. A plug (4-pole plug} of an existing 4-pole headset
can be inserted into the jack 14.
[0060]
10 When the plug 23 is inserted into a 3-pole jack including
no microphone terminal corresponding to the microphone
terminal TJ3, the sound signal terminals TPl and TP2 of the
plug 23 are connected with the sound signal terminal of the
3-pole jack, the ground terminal TP4 of the plug 23 is connected
15 with the ground terminal of the 3-pole jack, and the microphone
terminal TJ3 of the plug 23 is configured not to cause the
terminals to be short-circuited. The same applies to the jack
14.
[0061]
20 The plug 23 is neither limited to the same plug as the
4-pole plug installed in the existing headset nor the 4-pole
plug. In other words, for example, a 3-pole plug including
one (monaural) sound signal terminal TPl, one microphone
terminal TP3, and one ground terminal TP4 and a 5- or more
2 5 pole plug including a separate microphone terminal or a
terminal for a predetermined signal in addition to two sound
signal terminals TJ1 and TJ2, one microphone terminal TJ3,
and one ground terminal TJ4 may be employed as the plug 23.
Here, since a plug including many poles (terminals) has a
30 complicated configuration, for example, a 4-, 5-, or 6-pole
plug that is not extremely large in the number of poles can
18
SP353071WO00
be employed as the plug 23.
[0062]
The above points are similarly applied to the jack 14.
[0063]
5 Here, in Fig. 2, in order to simplify the drawing, the
4-pole plug 23 is installed directly in the main body of the
input device 20, but the 4-pole plug 23 may be connected to
the main body of the input device 20 via a 4-core cable.
[0064]
..;-10 In the host device 10 serving as the smartphone, the
analog sound interface 12 includes a digital-to-analog
converter (DAC) 31, a power amplifier {a headphone amplifier)
32, and a resistor (R) 33.
[0065]
15 The digital sound signals of the L and R channels, that
is, for example, a sound signal of a song reproduced in the
host device 10 serving as the music player or a sound signal
of a voice of a phone call counterpart received by the host
device 10 serving as the telephone are supplied from the signal
20 processing block 11 to the DAC 31.
[0066]
The DAC 31 performs DA conversion on the digital sound
signals of the L and R channels received from the signal
processing block 11 to obtain the analog sound signals of the
25 L and R channels, and supplies analog sound signals of the
L and R channels to the power amplifier 32.
[0067]
The power amplifier 32 amplifies the analog sound signals
of the L and R channels received from the DAC 31 as necessary,
30 and outputs the amplified analog sound signals of the L and
R channels to the sound signal terminal TJ1 and TJ2 of the
•a
19
SP353071WO00
jack 14.
[0068]
When the plug 23 is inserted into the jack 14, the sound
signal terminals TJl and TP1 are connected to each other, and
5 the sound signal terminals TJ2 and TP2 are connected to each
other as described above, and thus the analog sound signals
of the L and R channels output to the sound signal terminal
TJl and TJ2 of the jack 14 are output to the sound signal
terminals TPl and TP2 of the plug 23, respectively.
--.10 [0069] - -
One end of the resistor 33 is connected to a power source
VD, and the other end of the resistor 33 is connected to a
terminal 41A of a switch 41.
[0070]
15 In the host device 10 serving as the smartphone, the
multiplexed data interface 13 includes a switch 41, a capacitor
43, a microphone detecting unit 44, an association detecting
unit 45, an interrupter 46, a transmission/reception
processing unit 47, a register 48, and an I2C interface (I/F)
20 49.
[0071]
The switch 41 includes terminals 41A and 41B, and is
connected to the microphone terminal TJ3 of the jack 14. The
switch 41 connects the microphone terminal TJ3 of the jack
25 14 with the terminal 41A or 41B by selecting the terminal 41A
or 41B.
[0072]
The switch 41 selects the terminal 41A of the terminals
41A and 41B in a default state, that is, an initial state,
30 a standby state, a state in which nothing is inserted in the
jack 14, and a state in which the switch 41 does not perform
i
20
SP353071WO00
switching to select the terminal 41B.
[0073]
The other end of the resistor 33 is connected to the
terminal 41A as described above, and a sound signal line JA
5 serving as a signal line for receiving an analog sound signal
#0 output from the microphone 81o which will be described later
is connected to the terminal 41A.
[0074]
The sound signal line JA connects the terminal 41A with
--,10 the signal processing block 11, and when the switch 41 selects
the terminal 41A (eventually, the sound signal line JA
connected to the terminal 41A), the signal processing block
11 is connected to the microphone terminal TJ3 of the jack
14 via the sound signal line JA connected to the terminal 41A
15 and the switch 41.
[0075],
The other end of the resistor 33 whose one end is connected
to the power source VD is also connected to the terminal 41A
as described above, and when the switch 41 selects the terminal
20 41A, the power source VD is also connected to the microphone
terminal TJ3 of the jack 14 via the resistor 33 and the switch
41.
[0076]
A multiplexed data signal line JB for receiving the
25 multiplexed data transmitted from the input device 20 is
connected to the terminal 41B.
[0077]
In addition to the terminal 4IB, the power source VD
and the transmission/reception processing unit 47 are connects
30 to the multiplexed data signal line JB, and thus when the switch
41 selects the terminal 41B (eventually, the multiplexed data
t
21
SP353071WO00
signal line JB connected to the terminal 41B) , the power source
VD and the transmission/reception processing unit 47 are
connected to the microphone terminal TJ3 of the jack 14 via
the multiplexed data signal line JB and the switch 41.
5 [0078]
One end of the capacitor 43 is connected to themicrophone
terminal TJ3 of the jack 14, the other end of the capacitor
43 is connected to the association detecting unit 45, and the
capacitor 43 cuts off a direct current (DC) component of a
10 signal passing through the capacitor 43.
[0079]
The microphone detecting unit 44 monitors a voltage of
the microphone terminal TJ3 of the jack 14.
[0080]
15 When the plug 23 is inserted into the jack 14, the
microphone terminals TJ3 and TP3 are connected, the microphone
81Q of the input device 20 is connected to the power source
VD via a switch 71, the microphone terminal TP3 of the plug
23, the microphone terminal TJ3 of the jack 14, the switch
20 41, and the resistor 33.
[0081]
In this case, the microphone 81o of the input device
20 functions as a DC resistor (component) of several k ohms
for the host device 10, and the voltage of the microphone
25 terminal TJ3 of the jack 14 changes. Based on the change in
the voltage, the microphone detecting unit 44 detects that
the microphone has been connected, that is, that (the plug
of) the plug device including themicrophone such as the headset
including the 4-pole plug has been inserted into the jack 14.
30 The microphone detecting unit 44 may detect that the microphone
has been connected based on a change in a signal rather than
:'A
22
SP353071WO00
a voltage such as a change in an electric current flowing to
the microphone terminal TJ3 in addition to the change in the
voltage of the microphone terminal TJ3.
[0082]
5 Upon detecting that the microphone has been connected,
the microphone detecting unit 44 supplies a microphone
detection signal indicating the detection of the microphone
to the association detecting unit 45.
[0083]
10 When the microphone detection signal .is supplied from
the microphone detecting unit 44, that is, when the plug of
the plug device including the microphone is inserted into the
jack 14, the association detecting unit 45 outputs a handshake
signal for detecting whether or not the plug device is the
15 associated device.
[0084]
The handshake signal output from the association
detecting unit 45 is supplied to the microphone terminal TJ3
of the jack 14 via the capacitor 43.
20 [0085]
Here, for example, a sine wave of several tens to several
hundreds of kHz can be employed as the handshake signal.
[0086]
After the microphone detection signal is supplied from
25 the microphone detecting unit 44, and the handshake signal
is output as described above, when a predetermined signal
responding to the handshake signal is received from the
microphone terminal TJ3 of the jack 14 via the capacitor 43,
the association detecting unit 45 detects the plug device whose
30 plug is inserted into the jack 14 to be the associated device.
[0087]
,#
23
SP353071WO00
When the plug device whose plug is inserted into the
jack 14 is detected tobe the associateddevice, the association
detecting unit 45 switches the switch 41 selecting the terminal
41A to select the terminal 41B, and supplies information
5 indicating switching of the switch 41 to the interrupter 46.
[0088]
When information indicating that the switch 41 has been
switched to select the terminal 41B is supplied from the
association detecting unit 45, the interrupter 46 supplies
10 information indicating that (theplugof) theassociateddevice
has been inserted into the jack 14 to the signal processing
block 11.
[0089J
Here, when the information indicating that the switch
15 41 has been switched to select the terminal 41B is supplied
from the association detecting unit 45 to the interrupter 46,
the interrupter 4 6 supplies the information indicating that
the associated device has been inserted into the jack 14 to
the signal processing block 11, but it may be inquired about
20 whether or not the associated device has been inserted into
the jack 14 by performing polling at regular intervals (at
irregular intervals) from the signal processing block 11 to
the interrupter 46.
[0090]
2 5 When the information indicating that the associated
device has been inserted into the jack 14 is supplied from
the interrupter 46, the signal processing block 11 performs
signal processing for the associated device.
[0091]
30 The clock is supplied from the clock generating unit
15 to the transmission/reception processing unit 47, and the
24
SP353071WO00
transmission/reception processing unit 47 operates in
synchronization with the clock supplied from the clock
generating unit 15.
[0092]
5 Then, when the switch 41 selects the terminal 41B, the
transmission/reception processing unit 47 receives the
multiplexed data supplied via the microphone terminal TJ3 of
the jack 14, the switch 41, and the multiplexed data signal
line JB.
10 [0093]
The transmission/reception processing unit 47 performs
an appropriate process such as a process of demultiplexing
(deserializing) (demodulating) the multiplexed data, and
separates original data included in the multiplexed data, for
15 example, digital sound signals #0, #1, #2, #3, and #4 and
additional data.
[0094]
Here, in the present embodiment, for example, the digital
sound signals #0, #1, #2, #3, and #4, and additional data are
20 included in the multiplexed data.
[0095]
Each of the digital sound signals #0, #1, #2, #3, and
#4 is the digital sound signal corresponding to the sound
collected by the microphone 81o, 81i, 812, 813, and 814 which
25 will be described later.
[0096]
The additional data includes a switch (SW) signal
indicating an operation of a switch 80 which will be described
later, device information which will be described later, and
30 other data.
[0097]
• • &
25
SP353071WO00
The transmission/reception processing unit 47 supplies
the digital sound signals #0, #1, #2, #3, and #4 and the switch
signal included in the additional data to the signal processing
block 11, supplies the device information and the other data
5 included in the additional data to the register 48, and supplies
the device information and the other data included in the
additional data to the signal processing block 11 via the I2C
interface 49.
[0098]
10 Here,-the signal processing block 11 can perform various
signal processing according to the device information using
the digital sound signals #0, #1, #2, #3, and #4 and the switch
signal supplied from the transmission/reception processing
unit 47 or data (information) supplied via the I2C interface
15 49 as necessary.
[0099]
In other words, for example, the signal processing block
11 may perform a noise cancellation (NC) process (which will
be described later) on the sound signal of the song supplied
20 to the DAC 31 as the signal processing according to the device
information using the digital sound signals #1 to #4 . Further,
for example, the signal processing block 11 may perform a beam
forming process or the like as the signal processing according
to the device information using the digital sound signals #01
25 to #4.
[0100]
When the switch 41 selects the terminal 41B, the
transmission/reception processing unit 47 not only receives
the multiplexed data as described above but also transmits
30 a command on the associated device to the plug device serving
as the associated device whose plug is inserted into the jack
26
SP353071WO00
14 via the multiplexed data signal line JB, the switch 41,
and the microphone terminal TJ3 of the jack 14 according to
a request supplied from the signal processing block 11 via
the I2C interface 49.
5 [0101]
The register 48 temporarily stores the device
information and the like supplied from the
transmission/reception processing unit 47.
[0102]
10 The I2C interface 49 function as an interface that
connects the transmission/reception processing unit 47 with
the signal processing block 11 according to an inter-integrated
circuit (I2C) specification.
[0103]
15 In the input device 20 serving as the headset, the analog
sound interface 21 includes drivers 61L and 61R, a switch
(button) 80, and the microphone 810.
[0104]
The drivers 61L and 61R are drivers (headphone driver}
20 (for example, transducers that are configured with a coil,
a vibrating plate, and the like and converts a sound signal
into a sound (sound wave) serving as air vibrations), and
outputs (emits) the sounds corresponding to the sound signals
supplied from the sound signal terminals TPl and TP2 of the
25 plug 23, respectively.
[0105]
As described above, when the plug 23 is inserted into
the jack 14, the sound signal terminals TJl andTPl are connected,
the sound signal terminals TJ2 and TP2 are connected, and,
30 for example, the sound signal of the song or the like reproduced
in the host device 10 is output from the signal processing
!i
27
SP353071WO00
block 11 to the sound signal terminals TP1 and TP2 of the plug
23 via the DAC 31, the power amplifier 32, and the jack 14.
[0106]
As a result, the sounds corresponding to the sound
5 signals of the song or the like reproduced in the host device
10 are output from the drivers 61L and 61R.
[0107]
The switch 80 is operated by the user, and changes a
switch signal (an impedance of the switch 80 seen from a connect
10 point PS) serving as a voltage of the connect point PS connected
to the switch 80 when operated and when not operated. The
switch signal (an H or L level) of the switch 80 is supplied
to a terminal 71Aof the switch 71 and a transmission processing
unit 78.
15 [0108]
The microphone 81o is a transducer that converts a sound
(sound wave) serving as a physical quantity into a sound signal
serving as an electric signal, and outputs an analog sound
signal corresponding to a sound input to the microphone 81o-
20 [0109]
Here, for example, the microphone 81o can be used as
a voice microphone that is intended to collect the voice of
the user wearing the input device 20 serving as the headset.
[0110]
25 An output terminal of the microphone 810 is connected
to an amplifier 820, a resistor (R) 83o, and a connect point
PS to which the switch signal of the switch 80 is output, and
the connect point PS is connected to the terminal 71A of the
switch 71.
30 [0111]
Thus, the switch signal of the switch 80 is superimposed
•'J
28
SP353071WO00
on the analog sound signal output from the microphone 810 at
the connect point PS, and then the resultant signal is supplied
to the terminal 71A of the switch 71.
[0112]
5 • The switch 8 0 and the microphone 81o configure the analog
sound interface 21 as described above and configure the
multiplexed data interface 22 as well as will be described
later.
[0113]
10 In the input device 20 serving as the headset, the
multiplexed data interface 22 includes the switch 71, a
capacitor 72, an association detecting unit 73, a low drop-out
regulator (LDO) 74, a control unit 75, a phase lock loop (PLL)
77, the transmission processing unit 78, the switch 80, the
15 microphones 810, 81i, 812, 813, and 814, amplifiers 8 20, 82i,
822, 823, and 824, resistors 830, 83x, 832, 833, and 834,
analog-to-digital converters (ADCs) 84Q, 84I, 842, 843, and
844, and non-volatile memory 85.
[0114]
20 The switch 71 includes terminals 71A and 71B and is
connected to the microphone terminal TP3 of the plug 23. The
switch 71 connects the microphone terminal TP3 of the plug
23 with the terminal 71A or 71B by selecting the terminal 71A
or 71B.
25 [0115]
The switch 71 selects the terminal 71A of the terminals
71A and 71B in the default state.
[0116]
A sound signal line PA serving as the signal line for
30 transmitting the analog sound signal #0 output from the
microphone 81Q is connected to the terminal 71A.
•a29
SP353071WO00
[0117]
The sound signal line PA connects the terminal 71A with
the connect point PS, and when the switch 71 selects the terminal
71A {eventually, the sound signal line PA connected to the
5 terminal 71A), the connect point PS is connected to the
microphone terminal TP3 of the plug 23 via the sound signal
line PA connected to the terminal 71A, and the switch 71.
[0118]
Thus, the analog sound signal output from the microphone
10 81Q on which-the switch signal of the switch.80 is superimposed
at the connect point PS is output to the microphone terminal
TP3 of the plug 23 via the sound signal line PA and the switch
71 selecting the terminal 71A.
[0119]
15 A multiplexed data signal line PB for transmitting the
multiplexed data output from the transmission processing unit
78 to the host device 10 is connected to the terminal 71B.
[0120]
In addition to the terminal 71B, the control unit 75,
20 the PLL 77, and the transmission processing unit 78 are
connected to the multiplexed data signal line PB, and thus,
when the switch 71 selects the terminal 71B (eventually, the
multiplexed data signal line PB connected to the terminal 7IB} ,
the control unit 75, thePLL77, and the transmissionprocessing
25 unit 78 are connected to the microphone terminal TP3 of the
plug 23 via the multiplexed data signal line PB and the switch
71.
[0121]
In addition to the multiplexed data signal line PB, the
30 LDO 74 is connected to the terminal 71B, and when the switch
71 selects the terminal 71B, the LDO 74 is also connected to
30
SP353071WO00
the microphone terminal TP3 of the plug 23 via the switch 71.
[0122]
One end of the capacitor 72 is connected to the microphone
terminal TP3 of the plug 23, and the other end of the capacitor
5 72 is connected to the association detecting unit 73, and the
capacitor 72 cuts off a DC component of a signal passing through
the capacitor 72.
[0123]
Upon receiving the handshake signal from the microphone
-:,.10 terminal TP3 of the plug 23 via the capacitor 72, the association
detecting unit 73 detects the jack device including the jack
into which the plug 23 is inserted to be the associated device .
[0124]
When the jack device including the jack into which the
15 plug 23 is inserted is detected to be the associated device,
the association detecting unit 73 switches the switch 71
selecting the terminal 71A to select the terminal 71B, and
in order to report the fact that the input device 20 is the
associated device to the jack device including the jack into
20 which the plug 23 is inserted, the handshake signal having
the same or different frequency as the received handshake
signal is output to the microphone terminal TP3 of the plug
23 via .the capacitor 72.
[0125]
25 The LDO 74 is a voltage regulator, and generates a
predetermined voltage from the signal supplied from the
microphone terminal TP3 of the plug 23 via the switch 71,
supplies electric power serving as a power source to the
amplifier 82i and the like via the resistor 83i, and supplies
30 electric power to the control unit 75> the transmission
processing unit 78, the ADC 8 4i, and blocks of the multiplexed
'is
31
SP353071WO00
data interface 22 that need electric power.
[0126]
Thus, the multiplexed'data interface 22 of the input
device 20 operates by the electric power serving as the power
5 source supplied from (the power source VD of) the host device
10.
[0127]
The signal lines used for the LDO 74 to supply the electric
power serving as the power source to the respective blocks
10 are appropriately omitted in order to avoid complicated
illustration.
[0128]
The control unit 75 includes a register 76 therein, and
performs a process according to a storage value of the register
15 76.
[0129]
The control unit 75 performs writing of data in the
register 76, reading of data from the register 76 and the
non-volatile memory 85, and other processes according to the
20 signal (command) supplied from the microphone terminal TP3
of the plug 23 via the switch 71 {selecting the terminal 71B)
and the multiplexed data signal line PB.
[0130]
Here, in reading of data from the register 76, the control
25 unit 75 reads data from the register 76, and supplies the read
data to the transmission processing unit 78. In the
transmission processing unit 78, data from the control unit
75 is included in the multiplexed data and transmitted from
the microphone terminal TP3 of the plug 23 via the multiplexed
30 data signal line PB, and the switch 71.
[0131]
32
SP353071WO00
In reading of data from the non-volatile memory 85, the
control unit 75 controls the transmission processing unit 78
such that data is read from the non-volatile memory 85, included
in the multiplexed data, and transmitted from the microphone
5 terminal TP3 of the plug 23 via the multiplexed data signal
line PB and the switch 71.
[0132]
In addition, the control unit 75 controls the necessary
block of the input device 20 as necessary. The signal line
10 for controlling the necessary block through.the control unit
75 is appropriately omitted in order to avoid complicated
illustration.
[0133]
When the switch 71 selects the terminal 71B, the signal
15 from the jack device including the jack (the associated device)
into which the plug 23 is inserted is supplied to the PLL 77
via the microphone terminal TP3 of the plug 23, the switch
71, and the multiplexed data signal line PB.
[0134]
20 The PLL 77 generates the clock synchronized with the
signal supplied via the microphone terminal TP3 of the plug
23, the switch 71, and the multiplexed data signal line PB,
and supplies the generated clock to the transmission processing
unit 78 and any other necessary block.
25 [0135]
The switch signal (the H or L level indicating whether
or not the switch 80 has been operated) from the switch 80
is supplied to the transmission processing unit 78, and, for
example, the sound signal #i serving as a 1-bit digital signal
30 of a sound collected by the microphone 81i is supplied from
the ADC 84i (i = 0, 1, 2, 3, and 4).
;«
33
SP353071WO00
[0136]
The transmission processing unit 78 operates in
synchronization with the clock supplied from the PLL 77-,
performs (time division) multiplexing (serializing)
5 (modulation) on the switch signal supplied from the switch
80, the digital sound signal #i supplied from the ADC 84i,
the data read from the register 76, and the data (the device
information) read from the non-volatile memory 85, performs
any other necessary process, and transmits the resultant
10 multiplexed data -from the microphone terminal TP3 of the plug
23 via the multiplexed data signal line PB and the switch 71.
[0137]
Here, the multiplexed data includes the digital sound
signals #0, #1, #2, #3, and #4 and the additional data as
15 described above. The switch signal, the data read from the
register 76, and the data read from the non-volatile memory
85 are the additional data.
[0138]
The microphone 81i is a transducer that converts a sound
2 0 (sound wave) serving as a physical quantity into a sound signal
serving as an electric signal, and outputs the analog sound
signal #i corresponding to a sound #i input to the microphone
81±.
[0139]
25 Here, for example, the microphone 810 can be used as
a voice microphone that is intended to collect the voice of
the user wearing the input device 20 serving as the headset.
[0140]
For example, the microphones 81i to 814 can be used as
30 an NC microphone that is intended to collect a sound such as
a noise and used for an NC process performed by the signal
34
SP353071WO00
processing block 11 of the host device 10.
[0141]
The analog sound signal #i output from the microphone
81i is supplied to the amplifier 82i.
5 [0142]
The amplifier 82i amplifies the analog sound signal #i
output from the microphone 81i, and supplies the analog sound
signal #i to the ADC 84j..
[0143]
10 The resistor 83i is connected to between the output
terminal of the LDO 74 and a connection point of the microphone
81i and the amplifier 82i.
[0144]
The ADC 84j. performs the AD conversion on the analog
15 sound signal #i supplied from the amplifier 82i, and supplies
the resulting digital sound signal #i to the transmission
processing unit 78.
[0145]
Here, for example, AX modulation serving as 1-bit AD
20 conversion can be employed as the AD conversion of the ADC
84±.
[0146]
The non-volatile memory 8 5 is, for example, one time
programmable (OTP) memory, erasable programmable read only
25 memory (EPROM) , or the like, and the non-volatile memory 85
stores the device information.
[0147]
The device information is information related to the
input device 20, and the device in format ion may include a vendor
30 identification (ID) specifying a manufacturing company of the
input device 20 or the like or a product ID specifying a model
35
SP353071WO00
of the input device 20 (an individual) or the like.
[0148]
The device information may further include
configuration function information indicating a
5 configuration, a function, and an intended use of the input
device 20.
[0149]
For example, information indicating that the input
device 20 is a headset or the like, the number of transducers
10 such as the number of microphones 81i installed in the input
device 20 can be employed as the configuration function
information.
[0150]
The device information may include process information
15 for causing the signal processing block 11 to perform an optimal
(or appropriate) process for the input device 20 when the plug
23 of the input device 20 is inserted into the jack 14 of the
host device 10, and the input device 20 is used.
[0151]
20 For example, an algorithm of the NC process for
performing the optimal NC process for the input device 20
serving as the headset when the NC process is performed by
the signal processing block 11 the host device 10 serving as
the smartphone functioning as the music player, a filter
25 coefficient of a filter used in the NC process, characteristics
of the microphone 81i and characteristics of the drivers 61L
and 61R that can be used to obtain the filter coefficient,
and the like can be employed as the process information.
[0152]
30 In Fig. 2, one switch 80 is installed in the input device
20, but two or more switches may be installed in the input
i
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SP353071WO00
device 20 (in parallel to the connect point PS) . The input
device 20 may be configured without the switch.
[0153]
In Fig. 2, the five microphones 810 to 814 are installed
5 in the input device 20, but four or less or six or more
microphones may be installed in the input device 20.
[0154]
A transducer that converts a physical quantity into an
electric signal rather than amicrophone, that is, for example,
10 an acceleration sensor, a touch sensor, a.biological sensor
that senses a biological physical quantity such as a body
temperature or a pulse, or the like may be installed in the
input device 20.
[0155]
15 Fig. 3 is a flowchart for describing processes of the
host device 10 and the input device 20 of Fig. 2.
[0156]
In step Sll, in the host device 10, the switch 41 selects
the terminal 41A in the default state.
20 [0157]
On the other hand, in step S21, in the input device 20,
the switch 71 selects the terminal 71A in the default state.
[0158]
Then, when the plug 23 of the input device 20 is inserted
25 into the jack 14 of the host device 10, in step S12, in the
host device 10, the microphone detecting unit 44 detects the
microphone 810 serving as the voice microphone arranged in
the input device 20 serving as the plug device including the
plug 23 inserted into the jack 14.
30 [0159]
In other words, when the plug 23 is inserted into the
,#
37
SP353071WO00
jack 14, the microphone terminal TJ3 of the jack 14 is connected
with the microphone terminal TP3 of the plug 23, and the
microphone 81Q of the input device 20 is connected to the power
source VD via the switch 71 (selecting the terminal 71A), the
5 microphone terminal TP3 of the plug 23, the microphone terminal
TJ3 of the jack 14, the switch 41 (selecting the terminal 41A) ,
and the resistor 33.
[0160]
In this case, the microphone 810 of the input device
10 20 functions as a DC resistor (component) of several k ohms
for the host device 10, and the voltage of the microphone
terminal TJ3 of the jack 14 changes. Based on the change in
the voltage, the microphone detecting unit 44 detects that
the microphone 81Q has been connected, eventually, the
15 microphone 81Q.
[0161]
Upon detecting the microphone 81o, the microphone
detecting unit 44 supplies the microphone detection signal
indicating the detection of the microphone 81o to the
20 association detecting unit 45.
[0162]
When the microphone detection signal is supplied from
the microphone detecting unit 44, in step S13, the association
detecting unit 45 transmits the handshake signal.
25 [0163]
The handshake signal transmitted from the association
detecting unit 45 arrives at the association .detecting unit
73 of the input device 20 via the capacitor 43, the microphone
terminal TJ3 of the jack 14, the microphone terminal TP3 of
30 the plug 23, and the capacitor 72.