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JP2010157842

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2010157842
An information processing apparatus and an information processing method capable of reliably
suppressing the occurrence of oscillation with a simple configuration. According to one
embodiment, an information processing apparatus includes a jack, a noise canceller unit, a
determination unit, and a first regulation unit. The jack is connectable to a plug of a headphone
equipped with a microphone, and outputs a first signal to the headphone and inputs a second
signal from the microphone. The noise canceller unit generates a third signal that cancels a noise
component around the headphones based on the second signal input from the jack, and performs
an operation of superimposing the third signal on the first signal. It is possible. The
determination unit determines whether at least one of the first signal and the second signal has
exceeded a predetermined level. The first regulating unit regulates the operation of the noise
canceller unit when the determining unit determines that the predetermined level is exceeded.
[Selected figure] Figure 1
INFORMATION PROCESSING APPARATUS AND INFORMATION PROCESSING METHOD
[0001]
The present invention relates to an information processing apparatus such as a notebook
personal computer and an information processing method.
[0002]
Noise-canceling headphones (including earphones) detachably configured to an information
processing apparatus such as a notebook personal computer.
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1
The same applies to the following. ) Generally have pin-shaped plugs. The plug is provided with a
plurality of plug terminals arranged in the insertion / removal direction with respect to the jack
provided in the information processing apparatus. Corresponding to the plug terminals,
connector terminals on the jack side are also arranged in a row in the plug insertion and removal
direction.
[0003]
The noise canceling headphone is equipped with a microphone for collecting surrounding sound
as noise. This noise canceling headphone plug has a microphone input terminal and a speaker
output terminal in a row in the plug insertion and removal direction, and when the plug is
inserted into and removed from the jack, the corresponding plug terminals and The jack terminal
may come in contact with the terminal. As a result, when the noise canceling function is on and
the speaker output terminal on the plug side contacts the microphone input terminal on the jack
side, a part of the output from the speaker is fed back to the microphone to cause oscillation
(howling).
[0004]
The technique described in Patent Document 1 detects plug removal by voltage change of a
voltage supply line which is connected to an audio signal line and supplies a reference voltage to
a microphone via the audio signal line. When removal of the plug is detected, the output from the
signal amplification means in the signal path is suppressed to prevent the above oscillation. JP
2008-92366 A (paragraphs [0002] to [0004], [0008], etc.)
[0005]
In the technology described in Patent Document 1, as described above, the plug removal is
detected by the voltage change of the voltage supply line, so the noise canceling function is
provided even when the oscillation does not actually occur. There is a risk of being turned off.
Further, in the technique described in Patent Document 1, a switch is specially required on the
signal path of the audio signal line for preventing oscillation, and the number of parts is
increased.
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2
[0006]
An object of the present invention is to provide an information processing apparatus and an
information processing method capable of reliably suppressing the occurrence of oscillation with
a simple configuration.
[0007]
In order to achieve the above object, an information processing apparatus according to the
present invention includes a jack, a noise canceller unit, a determination unit, and a first
regulation unit.
The jack is connectable to a plug of a headphone equipped with a microphone, and outputs a first
signal to the headphone and inputs a second signal from the microphone. The noise canceller
unit may generate a third signal for canceling noise components around the headphone based on
the second signal input from the jack, and may be operable to superimpose the third signal on
the first signal. It is. The determination unit determines whether at least one of the first signal
and the second signal has exceeded a predetermined level. The first regulating unit regulates the
operation of the noise canceller unit when the determining unit determines that the
predetermined level is exceeded.
[0008]
In the present invention, since the determination unit determines that oscillation has actually
occurred, the occurrence of oscillation can be reliably suppressed. Further, according to the
present invention, a switch is provided on the signal path of the audio signal line when oscillation
occurs, and this switch is not turned off when oscillation occurs (Patent Document 1), and the
operation of the noise canceller portion is restricted. To be configured. Restricting the operation
of such a noise canceller unit is a function conventionally used in an information processing
apparatus having a noise canceling function. For example, when the noise canceling function is
turned on / off in accordance with the preference of the user on the user interface screen, the
function of restricting the operation of such a noise canceller unit is used. In the present
invention, it is possible to use the function of restricting the operation of such a noise canceller
unit. Therefore, it is not necessary to increase the number of special switches to reliably suppress
the occurrence of oscillation.
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[0009]
In the present invention, a first detection unit that further detects that a plug is connected to the
jack, and a predetermined time after the first detection unit detects that a plug is connected to
the jack, A second control unit may be provided to control the operation of the noise canceller
unit. As a result, the operation of the noise canceller unit is not restricted due to a malfunction.
[0010]
In the present invention, a second detection unit for detecting that the plug of the headphone
provided with the microphone is connected to the jack, and a plug of the headphone having the
microphone provided to the jack in the second detection unit The second control unit may
include a release unit that releases the restriction of the operation of the noise canceller unit
when the connection is detected. Thus, the noise canceller unit operates in response to the
normal connection of the headphone plug having the microphone to the jack.
[0011]
An information processing apparatus according to another aspect of the present invention
includes a jack, a noise canceller unit, a switch, a comparator, and a flip flop. The jack is
connectable to a plug of a headphone equipped with a microphone, and outputs a first signal to
the headphone and inputs a second signal from the microphone. The noise canceller unit
generates a third signal that cancels a noise component around the headphone based on the
second signal input from the jack, and superimposes the third signal on the first signal. The
switch switches whether to superimpose the third signal on the first signal. A comparator
compares the first voltage of the first signal or the second voltage of the second signal with a
predetermined third voltage, the first voltage or the second voltage being the A fourth signal is
output when the third voltage is exceeded. The flip flop can hold the fourth signal, and when
holding the fourth signal, outputs a fifth signal to turn off the switch. In the present invention,
since the comparator determines that oscillation has actually occurred, the occurrence of
oscillation can be reliably suppressed with a simple configuration.
[0012]
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The present invention further includes a control unit that outputs a sixth signal that turns on the
switch, and the flip-flop can hold the sixth signal, and holds the sixth signal. When the switch is
turned on. This makes it possible to turn on the noise canceller function that has been turned off
by the operation of the user.
[0013]
In the present invention, the jack includes a microphone connection terminal, and the
information processing device is further predetermined with a power supply for supplying power
to the microphone connection terminal and a fourth voltage applied to the microphone
connection terminal. And a first hysteresis comparator that compares a fifth voltage and outputs
a seventh signal when the fourth voltage is lower than the fifth voltage. The control unit may be
configured to turn off the switch for a predetermined time when the first hysteresis comparator
outputs a seventh signal. As a result, the operation of the noise canceller unit is not restricted due
to a malfunction.
[0014]
In the present invention, the fourth voltage applied to the microphone connection terminal is
further compared with a predetermined sixth voltage lower than the fifth voltage, and the fourth
voltage is the fifth voltage. And a sixth hysteresis comparator for outputting an eighth signal
when the voltage is between the second and sixth voltages. The control unit may be configured to
turn on the switch when the second hysteresis comparator outputs an eighth signal. Thus, the
noise canceller unit operates in response to the normal connection of the headphone plug having
the microphone to the jack.
[0015]
In the information processing method according to still another aspect of the present invention, a
plug of a headphone provided with a microphone can be connected, and a first signal is output to
the headphone and a second signal is input from the microphone from the jack A third signal is
generated to cancel noise components around the headphones based on the input second signal.
The third signal is superimposed on the first signal. It is determined whether at least one of the
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first signal and the second signal exceeds a predetermined level. When it is determined that the
predetermined level is exceeded, superimposing the third signal on the first signal is restricted.
[0016]
In the present invention, since it is determined that oscillation has actually occurred, the
occurrence of oscillation can be reliably suppressed with a simple configuration.
[0017]
According to the present invention, the occurrence of oscillation can be reliably suppressed with
a simple configuration.
[0018]
Hereinafter, embodiments of the present invention will be described based on the drawings.
(Configuration of Information Processing Apparatus) FIG. 1 is a diagram showing a configuration
of an information processing apparatus according to an embodiment of the present invention.
An example of the information processing apparatus is a notebook personal computer. As shown
in FIG. 1, the information processing apparatus 1 includes an operating system (OS) 2, a display
unit 3, an audio unit 4, an oscillation detection / storage unit 5, and a malfunction prevention
unit 6.
[0019]
Although not shown, the information processing apparatus 1 includes hardware and software
provided in a general notebook personal computer. The hardware may be, for example, a
keyboard, a mouse pointer, a central processing unit (CPU), a memory controller hub (MCH), an I
/ O controller hub (ICH), and an audio codec. The software may be, for example, a BIOS (Basic
Input / Output System) or various application programs in addition to the above-described OS.
[0020]
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The OS 2 is, for example, a Windows (registered trademark) system. The OS 2 provides basic
functions commonly used by many application software, such as input / output functions such as
keyboard input and screen output, and management of disks and memories, and manages the
entire information processing apparatus 1. The OS 2 has an audio driver for managing the audio
codec and the ICH. The Audio Codec is an LSI (Large Scale Integration) used to incorporate a
sound function into a motherboard (not shown) of the information processing apparatus 1.
[0021]
The display unit 3 includes, for example, a liquid crystal display panel.
[0022]
The audio unit 4 includes a jack 7 for headphone connection, audio amplifiers 8 and 9, noise
cancellation units 10 and 11, adders 12 and 13, and switches 14 and 15.
[0023]
The headphone connection jack 7 is a 5-pole jack.
As schematically shown in FIG. 2, the headphone connection jack 7 has connector terminals of
MIC R, COM, MIC L, HP R, and HP L in order from the plug insertion side.
The connector terminal MIC R is connected to the right side microphone plug terminal of the
plug of the headphone-equipped headphone (noise canceling headphone). The connector
terminal COM is connected to the COM terminal of a plug of a headphone equipped with a
microphone. The connector terminal MIC L is connected to the left microphone plug terminal of
the plug of the headphone equipped with a microphone. The connector terminal HPR is
connected to the right headphone plug terminal of the plug of the headphone equipped with a
microphone. The connector terminal HP L is connected to the left headphone plug terminal of
the plug of the headphone equipped with a microphone. Not only a noise canceling headphone
but also a noise canceling non-compatible 3-pin headphone without a microphone can be
connected to the headphone connection jack 7.
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[0024]
The audio amplifier 8 amplifies an audio signal of the right channel output from the information
processing apparatus 1 to the outside. The audio signal of the right channel amplified by the
audio amplifier 8 is output to the headphone through the connector terminal HPR of the jack 7
for headphone connection. The audio amplifier 9 amplifies an audio signal of the left channel
output from the information processing apparatus 1 to the outside. The audio signal of the left
channel amplified by the audio amplifier 9 is output to the headphone through the connector
terminal HP L of the jack 7 for headphone connection.
[0025]
The noise cancellation unit 10 has a function of amplifying a signal, and generates a signal that
cancels out the noise component around the headphones based on the signal input from the
connector terminal MIC R in the jack 7 for headphone connection. The noise cancellation unit 11
has a function of amplifying a signal, and generates a signal that cancels out the noise
component around the headphone based on the signal input from the connector terminal MIC L
in the headphone connection jack 7. The signal that cancels out the noise component around the
headphones is, for example, a signal obtained by inverting the phase of the noise component. The
noise canceller units 10 and 11 adjust the degree of canceling out the noise component around
the headphones, the frequency characteristic, and the like by the control of the audio driver (not
shown).
[0026]
The adder 12 superimposes the signal output from the noise cancellation unit 10 on the signal
input to the audio amplifier 8. The adder 13 superimposes the signal output from the noise
cancellation unit 11 on the signal input to the audio amplifier 9.
[0027]
The switch 14 switches whether to output the signal output from the noise cancellation unit 10
to the adder 12. When the switch 14 is on, the signal output from the noise cancellation unit 10
is output to the adder 12. When the switch 14 is off, the output of the signal output from the
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8
noise cancellation unit 10 to the adder 12 is restricted. The switch 15 switches whether to
output the signal output from the noise cancellation unit 11 to the adder 13. When the switch 15
is on, the signal output from the noise cancellation unit 11 is output to the adder 13. When the
switch 15 is off, the output of the signal output from the noise cancellation unit 11 to the adder
13 is restricted. When the user noise canceling function is turned on / off using a user interface
screen described later, the switches 14 and 15 are turned on / off under the control of the OS 2.
That is, when the switches 14 and 15 are turned off, an audio signal whose noise canceling
function is turned off (regulated) is supplied to the headphones. That is, the audio signal is
supplied to the headphones even if the switches 14 and 15 are turned off.
[0028]
(Configuration of Oscillation Detection and Storage Unit) FIG. 3 is a diagram showing a
configuration of the oscillation detection and storage unit 5 shown in FIG. As shown in FIG. 3, the
oscillation detection / storage unit 5 includes a comparator 16 and a flip flop 17.
[0029]
The comparator 16 has a negative input terminal, a positive input terminal, and an output
terminal. The output line of the audio amplifier 8 is connected to the negative input terminal. A
voltage of -2.21 V is applied to the positive input terminal. The output terminal is connected to
the reset terminal of the flip flop 17.
[0030]
The flip flop 17 has a reset terminal R, a set terminal S, an output terminal Q, and an inverted
output terminal / Q. The output terminal of the comparator 16 is connected to the reset terminal
R. A signal (a signal for turning on the noise canceling function) is input to the set terminal S
from the OS 2. The output terminal Q is connected to the switches 14 and 15. The switches 14
and 15 are turned on / off by the output of the output terminal Q.
[0031]
As a result, when oscillation (howling) occurs, a voltage exceeding 2.21 V is applied to the
negative input terminal of the comparator 16, the flip flop 17 is reset (memory), and the switches
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14 and 15 are turned off.
[0032]
In the present embodiment, the occurrence of oscillation is detected based on the output of the
audio amplifier 8, so that the occurrence of oscillation can be accurately detected.
The output of the audio amplifier 8 does not exceed a predetermined level (2.21 V in terms of
voltage) in a normal state where no oscillation occurs, so that the occurrence of oscillation can be
detected reliably.
[0033]
(Configuration of Malfunction Prevention Unit) FIG. 4 is a diagram showing a configuration of the
malfunction prevention unit 6 shown in FIG. As shown in FIG. 4, the malfunction prevention unit
6 includes hysteresis comparators 18 and 19 and an exclusive NOR circuit 20.
[0034]
The hysteresis comparator 18 has an input terminal and an output terminal. The connector
terminal MIC R is connected to the input terminal of the hysteresis comparator 18. A microphone
power supply (2.6 V) is connected to the connector terminal MIC R via a resistor. The output
terminal of the hysteresis comparator 18 is connected to the OS 2 side and one input terminal of
the exclusive NOR circuit 20. The hysteresis comparator 18 outputs H from the output terminal
when the voltage applied to the input terminal exceeds 2.38 V in the state where H is output
from the output terminal as shown in FIG. The hysteresis comparator 18 outputs H from the
output terminal when the voltage applied to the input terminal becomes 2.17 V or less while
outputting L from the output terminal. As a result, the output terminal of the hysteresis
comparator 18 outputs H when the microphone plug terminal of the headphone or the
headphone (non-noise canceling headphone) of the three-pole plug is connected to the connector
terminal MICR. As a result, the OS 2 recognizes that a plug has been inserted into the jack 7.
[0035]
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10
The hysteresis comparator 19 has an input terminal and an output terminal. The connector
terminal MIC R is connected to the input terminal of the hysteresis comparator 19. A microphone
power supply (2.6 V) is connected to the connector terminal MIC R via a resistor. The output
terminal of the hysteresis comparator 19 is connected to the other input terminal of the exclusive
NOR circuit 20. The hysteresis comparator 19 outputs H from the output terminal when the
voltage applied to the input terminal exceeds 0.45 V in the state where H is output from the
output terminal as shown in FIG. The hysteresis comparator 19 outputs H from the output
terminal when the voltage applied to the input terminal becomes 0.82 V or less in a state where
L is output from the output terminal.
[0036]
The exclusive NOR circuit 20 has two input terminals and an output terminal. The output
terminal of the hysteresis comparator 18 is connected to one input terminal of the exclusive NOR
circuit 20. The output terminal of the hysteresis comparator 19 is connected to the other input
terminal of the exclusive NOR circuit 20. When the voltage applied to the input terminal exceeds
2.38 V or falls to 0.45 V or less, as shown in FIG. 7, the output terminal of the exclusive NOR
circuit 20 outputs H from the output terminal. L is output from the output terminal. The output
terminal of the exclusive NOR circuit 20 outputs H from the output terminal when the voltage
applied to the input terminal becomes 2.17 V or less or 0.82 V or more in a state where L is
output from the output terminal. It will be in the state of As a result, when the microphone plug
terminal of the headphone is normally connected to the connector terminal MIC R, the output
terminal of the exclusive NOR circuit 20 outputs H. As a result, the switches 14 and 15 are
turned on, and the signals output from the noise cancellation units 10 and 11 are output to the
adders 12 and 13. That is, the noise canceling function is turned on.
[0037]
(Operation of oscillation detection / storage unit) FIG. 8 shows a state in which the plug 101 of
the headphone (headphone for noise canceling) equipped with a microphone is incompletely
inserted into the headphone connection jack 7 shown in FIG. 2 Is shown. That is, in FIG. 8, the
plug terminal HP L of the plug 101 is connected to the connector terminal HP R of the
headphone connection jack 7, and the plug terminal COM of the plug 101 is connected to the
connector terminal MIC R of the headphone connection jack 7. It shows the state.
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[0038]
FIG. 9 shows the configuration of a circuit formed between the audio unit 4 and the headphone
100 in this case. Here, the switches 14 and 15 are turned on, and the noise canceling function is
turned on.
[0039]
In this state, a looped circuit 200 is formed as indicated by a dotted line in the figure. The looped
circuit 200 includes the audio amplifier 8, the connector terminal HP R of the headphone
connection jack 7, the plug terminal HP L of the plug 101, and the speaker 101 L. The looped
circuit 200 further includes the plug terminal COM of the plug 101, the connector terminal MIC
R of the headphone connection jack 7, the noise cancellation unit 10, the switch 14, and the
adder 12.
[0040]
When such a looped circuit is formed, oscillation (howling) occurs, an oscillation sound is output
from the headphone 100, and a larger voltage appears at the output of the audio amplifier 8 than
in the case of the normal maximum volume. The oscillation detection / storage unit 5 detects
such a large voltage appearing at the output of the audio amplifier 8 and stores its state.
[0041]
That is, when oscillation (howling) occurs, a voltage exceeding 2.21 V is applied to the negative
input terminal of the comparator 16 in the oscillation detection / storage unit 5, and the flip flop
17 is reset. That is, the occurrence of oscillation (howling) is stored by the flip flop 17.
[0042]
When the flip flop 17 in the oscillation detection / storage unit 5 is reset, the switch 14 is turned
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off by the output of the output terminal Q of the flip flop 17. As a result, the signal path of the
noise canceling function (the looped circuit 200) is cut off. Therefore, oscillation (howling) is
suppressed. That is, according to the present embodiment, when the oscillation detection /
storage unit 5 detects oscillation (howling), the noise canceling function is restricted, so that the
occurrence of oscillation (howling) is prevented.
[0043]
(Operation of Malfunction Prevention) FIG. 10 is a flowchart showing an operation related to the
malfunction prevention of the OS 2 side. When the power of the information processing
apparatus 1 is turned on, the OS 2 is activated, and the OS 2 determines whether or not the NCFlag (a flag set according to whether the noise cascading function is valid or invalid) is on (step
1001). ). That is, OS2 determines whether to enable the noise canceling function.
[0044]
If the OS 2 determines in step 1001 that the NC-flag is on, it determines whether the noise
canceling headphone is attached (step 1002). This is determined by whether H is output from the
output terminal of the exclusive NOR circuit 20 of the malfunction prevention unit 6 or not.
[0045]
If the OS 2 determines in step 1002 that the noise canceling headphone is attached, the circuit
function of the noise canceling is actually turned on (step 1003). This is performed by the OS 2
outputting a signal (for example, H) for turning on the noise canceling function to the set
terminal of the flip flop 17 of the oscillation detecting / storing unit 5 and turning on the
switches 14 and 15.
[0046]
If the OS 2 determines in step 1002 that the noise canceling headphone is not attached, the
circuit function of the noise canceling is actually turned off (step 1004). This is performed by the
OS 2 outputting a signal (for example, H) for turning off the noise canceling function to the reset
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terminal of the flip flop 17 of the oscillation detection / storage unit 5 and turning off the
switches 14 and 15.
[0047]
After turning off the noise canceling circuit function at step 1004, the OS 2 determines whether
any headphones are attached (step 1005). This is determined based on whether H is output from
the output terminal of the hysteresis comparator 18 of the malfunction prevention unit 6 or not.
[0048]
If the OS 2 determines in step 1005 that some headphones are attached, the OS 2 starts a timer
of 2.5 seconds, for example (step 1006).
[0049]
The OS 2 determines whether the noise canceling headphone has been worn during the 2.5
seconds (steps 1007 and 808).
This is determined based on whether H is output from the output terminal of the exclusive NOR
circuit 20 of the malfunction prevention unit 6 or not.
[0050]
The OS 2 actually turns on the circuit function of the noise canceling (step 1003) when the noise
canceling headphone is attached during this 2.5 seconds (step 1008). This is performed by the
OS 2 outputting a signal (for example, H) for turning on the noise canceling function to the set
terminal of the flip flop 17 of the oscillation detecting / storing unit 5 and turning on the
switches 14 and 15.
[0051]
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The OS 2 monitors switching of the noise canceling function in a user interface (UI) displayed on
the display unit 3 described later after Step 1003, No in Step 1005, and No in Step 1007 (Steps
1009, 810) ). That is, in step 1009, it is monitored whether the user has turned on the noise
canceling function by the operation on the UI screen, and if there is no user operation, the
process immediately passes. In step 1010, it is monitored whether the user has turned off the
noise canceling function by the operation on the UI screen, and if there is no user operation, it
passes immediately.
[0052]
If the OS 2 determines Yes in step 1009 or No in step 1010, that is, the noise canceling function
is turned on, the OS 2 determines whether the noise canceling headphone is attached (step
1011). This is determined by whether H is output from the output terminal of the exclusive NOR
circuit 20 of the malfunction prevention unit 6 or not.
[0053]
If the OS 2 determines in step 1011 that the noise canceling headphone is attached, the OS 2
executes the processing of step 1003 and subsequent steps. If the OS 2 determines in step 1011
that the noise canceling headphone is not attached, it executes the processing of step 1004 and
subsequent steps.
[0054]
The OS 2 turns the NC-Flag off (step 1012) if the noise cancellation function is turned off in the
step 1010, that is, if the user operates the UI screen (step 1012), and the noise cancellation
circuit function is actually turned off. (Step 1013). This is performed by the OS 2 outputting a
signal (for example, H) for turning off the noise canceling function to the reset terminal of the flip
flop 17 of the oscillation detection / storage unit 5 and turning off the switches 14 and 15.
[0055]
The OS 2 monitors switching of the noise canceling function in a user interface (UI) displayed on
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the display unit 3 described later after the noise canceling circuit function is actually turned off
in step 1013 (step 1014). , 815). That is, in step 1014, it is monitored whether the user has
turned off the noise canceling function by the operation on the UI screen, and if there is no user
operation, it passes immediately. In step 1015, it is monitored whether the user turns on the
noise canceling function by the operation on the UI screen, and if there is no user operation, it
passes immediately.
[0056]
When the user turns on the noise canceling function by the operation on the UI screen, the OS 2
turns on the NC-Flag (step 1016) and executes the processing of step 1002 and the subsequent
steps.
[0057]
Here, once the noise canceling function is turned off by the oscillation preventing operation by
the oscillation detection / storage unit 5, the user cancels the noise canceling function off by
reinserting the plug 101 of the headphone 100 or the operation on the UI screen. The off state
continues until you do.
When the user reinserts the plug 101 of the headphone 100, the state is as shown in FIG. 8 along
the way. If oscillation occurs in this state, the noise canceling function is turned off again by the
oscillation prevention operation of the oscillation detection / storage unit 5. That is, every time
the plug 101 of the headphone 100 is inserted, the noise canceling function may be turned off
by the oscillation prevention operation by the oscillation detection / storage unit 5. In order to
avoid such a situation, the operation of the malfunction prevention in the present embodiment
disables the noise canceling function until 2.5 seconds after it is detected that the plug 101 starts
to be inserted (step 1005-1008).
[0058]
If it takes a long time until insertion is complete after the plug 101 has been inserted, the
oscillation prevention operation by the oscillation detection / storage unit 5 may be activated,
but in general, unless the operation is specifically intended. The installation is completed in less
than 2.5 seconds. Therefore, in the present embodiment, the time for disabling the noise
canceling function is 2.5 seconds. However, this time is only an example, and in some cases it
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may be shorter or longer.
[0059]
(Specific Example of User Interface) Next, a specific example of a user interface (UI) related to the
noise cancellation function will be described. FIG. 11 is a view showing a UI screen displayed on
the display unit 3 under the control of the OS 2. As shown in FIG. 11, this UI screen has three
check boxes. The top check box is a button for switching whether the user enables or disables the
noise canceling function.
[0060]
The slider at the center is used to adjust the amount by which noise is reversely added by the
noise canceling function. The user uses this to adjust for optimal cancellation performance. The
default is the center value, and the slider returns to the center position when the "return to
specified value" button is pressed.
[0061]
The lowermost check box is a button for switching whether or not to display the message on the
screen when a headphone with a noise canceling function is connected. By enabling the display
of such a message, the user can see and know whether the headphones can handle the noise
canceling function. All the above operations are enabled by pressing the [Apply] button on the
lower right.
[0062]
Another Embodiment FIG. 12 is a diagram showing a configuration of an information processing
apparatus according to another embodiment of the present invention. In the information
processing apparatus according to the embodiment shown in FIG. 1, the occurrence of oscillation
is detected based on the output of the audio amplifier 8. On the other hand, as shown in FIG. 12,
in the information processing apparatus 1 according to this embodiment, the occurrence of
oscillation is detected based on the input side of the noise cancellation unit 10, that is, the
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microphone input signal of the headphones.
[0063]
FIG. 13 is a diagram showing the configuration of the oscillation detection / storage unit 5
'shown in FIG. As shown in FIG. 13, the oscillation detection and storage unit 5 ′ includes a
comparator 16 ′ and a flip flop 17 ′.
[0064]
The comparator 16 'includes a negative input terminal, a positive input terminal, and an output
terminal. The microphone input terminal MIC R is connected to the negative input terminal. A
voltage of −0.65 V is applied to the positive input terminal. The output terminal is connected to
the reset terminal of the flip flop 17 '.
[0065]
The flip flop 17 'has a reset terminal R, a set terminal S, an output terminal Q, and an inverted
output terminal / Q. The output terminal of the comparator 16 'is connected to the reset terminal
R. A signal (a signal for turning on the noise canceling function) is input to the set terminal S
from the OS 2. The output terminal Q is connected to the switches 14 and 15. The switches 14
and 15 are turned on / off by the output of the output terminal Q.
[0066]
As a result, when oscillation (howling) occurs, a voltage exceeding 0.65 V is applied to the
negative input terminal of the comparator 16 ′, the flip flop 17 ′ is reset (memory), and the
switches 14 and 15 are turned off.
[0067]
The present invention is not limited to the embodiments described above, but can be modified
and implemented within the scope of the technical idea, and the scope of the implementation is
also within the technical scope of the present invention.
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[0068]
For example, although the above embodiment describes the application of the present invention
to a notebook-type personal computer, the present invention is not limited to this, but may
naturally be applied to other information processing apparatuses such as mobile phones and
portable music players. It is applicable.
[0069]
In the above embodiment, the detection of the occurrence of oscillation is performed based on
the output of the amplifier for audio or the input of the noise cancellation unit, but both of them
are used to detect the occurrence of oscillation by performing predetermined weighting, for
example Of course it is good to do.
[0070]
In the above embodiment, the generation of oscillation is detected using a series of only one
channel in the configuration of stereo audio, but it is needless to say that the generation of
oscillation may be detected using a series of two channels. .
[0071]
The headphones described in the above embodiments also include earphones.
[0072]
It is a figure showing composition of an information processor concerning one embodiment of
the present invention.
It is a figure which shows roughly the jack for headphone connection shown in FIG.
It is a figure which shows the structure of the oscillation detection * memory | storage part
shown in FIG.
It is a figure which shows the structure of the malfunctioning prevention part shown in FIG.
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It is a figure which shows the characteristic of the hysteresis comparator (the 1) shown in FIG.
It is a figure which shows the characteristic of the hysteresis comparator (the 2) shown in FIG.
It is a figure which shows the output of the exclusive NOR circuit shown in FIG. It is a figure
which shows the relationship between a plug and a jack when oscillation (howling) generate |
occur | produces. It is a figure for demonstrating the path which oscillation (howling) generate |
occur | produces. It is a flowchart which shows the operation | movement relevant to a
malfunctioning prevention. It is a figure which shows the specific example of the user interface
(UI) screen regarding a noise cancellation function. It is a figure showing composition of an
information processor concerning other embodiments of the present invention. It is a figure
which shows the structure of the oscillation detection * memory | storage part shown in FIG.
Explanation of sign
[0073]
DESCRIPTION OF SYMBOLS 1 information processing apparatus 2 OS (Operating System) 3
display part 4 audio part 5 oscillation detection and memory part 6 malfunction prevention part
7 jack for headphone connection 8, 9 amplifier for audio 10, 11 noise cancellation part 12, 13
adder 14 15 switches 16 comparators 17 flip flops 18 and 19 hysteresis comparators 20
exclusive NOR circuit 100 headphones
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