JP2012004734

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DESCRIPTION JP2012004734
In a system for performing sound reproduction by a headphone device, an appropriate sound
pressure is automatically set according to a type of the headphone device to be used. An
information reading unit for reading information related to sensitivity from a storage unit is
provided to a headphone device having a speaker that reproduces an electrical signal of an
audible signal as sound and a storage unit that stores information related to the sensitivity of the
speaker. Moreover, the adjustment part which adjusts the output level of the said electrical signal
is provided. The controller further includes a control unit that controls the adjusting unit such
that the electric signal has an allowable maximum output level according to the information.
[Selected figure] Figure 1
Reproducing apparatus and reproducing method
[0001]
The present invention relates to a reproduction device that supplies an audio signal to a
headphone device while maintaining sound pressure regulation while maximizing the
performance of the headphone device.
[0002]
JP, 2009-232205, A
[0003]
The invention described in the above patent documents does not regulate the reproduction
sound pressure, but for identifying the type of headphone device on the headphone device side
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so that noise cancellation can be appropriately performed on various types of headphone
devices. It is a technology to hold information.
[0004]
Currently, with regard to sound reproduction of headphone devices, it is practiced to regulate the
reproduction sound pressure to a predetermined sound pressure for the purpose of measures
against deafness.
It is the maximum output voltage of the amplifier unit of the playback device and the maximum
sensitivity of the headphone device (so-called noise meter (the sound pressure level with
frequency weighting of the A characteristic can be measured) when headphone is input a
predetermined signal Of the maximum sound pressure obtained by a predetermined calculation).
That is, the maximum value of each of the amplifier output voltage and the headphone device
sensitivity is determined and adjusted so as not to exceed it.
That is, the amplifier with the characteristic of prescribed maximum amplifier output and the
headphone device with the characteristic of prescribed maximum headphone sensitivity are
combined to make the output sound pressure within a predetermined sound pressure. For
example, in the case of a headphone device, the sound pressure is regulated by connecting a
resistor in series to the speaker input unit.
[0005]
As a result, even if there are a plurality of types of playback devices such as headphones and
media players, the headphone output sound pressure during playback does not exceed the
specified sound pressure in any combination.
[0006]
However, even if it is a situation where amplifier output voltage and headphone sensitivity can be
enhanced by technological improvement by this measure, processing such as sandwiching
resistance in series is added for regulation, and the regulation output voltage or less, regulation
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sensitivity or less There are times when
However, in this case, not only the original performances of the reproduction device and the
headphone device can not be exhibited, but also the part flowing in the resistance becomes heat
and is inefficient in power. Also, the addition of resistance is a cause of distortion and is not
preferable in terms of performance.
[0007]
Also, for example, an amplifier which can be reproduced 10 dB larger than the "specified
maximum amplifier output" but with an amplifier suppressed to the "specified maximum
amplifier output" and "prescribed maximum headphone sensitivity" does not have performance
and 10 dB from the "specified maximum headphone sensitivity" In the case of a combination of
headphone devices with low sensitivity characteristics, reproduction can be performed only at a
sound pressure 10 dB lower than the specified sound pressure. In this case, if the amplifier is
capable of producing the original performance (reproduces 10 dB larger than the specified
maximum amplifier output ), the regulated sound pressure can be reproduced without
exceeding the regulated sound pressure. In other words, although high-performance
reproduction is possible within the regulated sound pressure, there is also a situation where the
performance can not be exhibited.
[0008]
In view of such a situation, the present invention aims to provide a reproduction apparatus for
supplying an audio signal (electric signal) of an appropriate level according to the type of
headphone apparatus to be used in a system that performs sound reproduction by the
headphone apparatus. I assume.
[0009]
The reproduction apparatus according to the present invention comprises: a speaker for
reproducing an electric signal of an audible signal as sound; and an information reading unit for
reading the sensitivity information from the storage unit of a headphone device having a storage
unit for storing the sensitivity information of the speaker; An adjustment unit that adjusts an
output level of the electric signal supplied to the headphone device, and the sensitivity
information is read from the storage unit via the information reading unit, and the electric signal
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is permitted based on the sensitivity information. And a control unit that controls the adjustment
unit to be within the maximum output level.
Further, the adjustment unit includes a power amplifier that is an output stage of the electric
signal to the headphone device, and a voltage switching unit that switches a supply voltage to the
power amplifier, and the control unit is based on the sensitivity information. The switching
control of the supply voltage of the voltage switching unit is performed. The information reading
unit has an L channel terminal, an R channel terminal, a ground terminal, and a power / control
terminal as a connection with the headphone device, and the L channel terminal and the R
channel. A connection switching unit is provided to switch connection between a case where the
terminal is a connection terminal between the control unit and the storage unit of the headphone
device and a case where the audible signal is supplied to the headphone device. The control unit
switches the connection switching unit to enable communication with the storage unit via the L
channel terminal and the R channel terminal.
[0010]
The adjustment unit may include an equalizer unit processing the electric signal, a gain unit
performing gain processing of the electric signal, a limiter unit performing limiter processing of
the electric signal, and a compressor unit processing the electric signal. . In those cases, the
control unit is one of the equalizer unit, the gain unit, the limiter unit, and the compressor unit so
that the electric signal falls within the maximum output level permitted according to the
sensitivity information. Or control multiple. When the storage unit of the headphone device is
capable of wireless communication, the information reading unit performs wireless
communication with the storage unit. Further, the sensitivity information is information of an
allowable range of the speaker sensitivity.
[0011]
The reproduction method according to the present invention comprises the steps of: reading the
sensitivity information from the storage unit of a headphone device having a speaker for
reproducing an electrical signal of an audible signal as sound and a storage unit for storing the
sensitivity information of the speaker; Adjusting the output level of the electrical signal so that
the electrical signal supplied to the headphone device is within an allowable maximum output
level.
[0012]
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According to these aspects of the present invention, the reproduction device can automatically
acquire information (sensitivity information) related to the sensitivity stored in the storage unit
of the headphone device of the headphone device.
That is, regardless of the user operation, information on the sensitivity of the headphone device
can be acquired each time the headphone device is connected. Then, based on the information
related to the sensitivity of the headphone device acquired in this manner, the electric signal
supplied by the reproduction device is set to be the allowable maximum output level. As a result,
the reproduction apparatus can automatically set an appropriate maximum output level
according to the headphone apparatus to be used. Here, as the type of the headphone device, for
example, another type of the headphone device, another type of characteristics of the provided
acoustic component, and the like can be mentioned. Therefore, according to the present
invention, it is possible to set the maximum output level according to the type of headphone
device and to set the maximum output level according to the characteristic of the acoustic
component of the same type. Further, according to the present invention, it is possible to read
out the information related to the sensitivity stored in the storage unit on the headphone device
side using the L channel and R channel terminals. Therefore, communication between the
headphone device and the reproduction device is possible using the conventional connection
portion as it is without changing the form of the connection portion.
[0013]
According to the present invention, stored information (sensitivity information) for each
headphone device can be automatically acquired on the playback device side without user
operation. And since sound pressure regulation is carried out based on the headphone side
memory information acquired in this way, it becomes possible to reproduce, maintaining original
sound quality in the state where original performance of the headphone device was exhibited.
That is, according to the present invention, appropriate sound pressure control can be performed
according to the type of headphone device to be used.
[0014]
FIG. 1 is a block diagram of a first embodiment of the present invention. It is an explanatory view
showing the details of the connection switching part of a 1st embodiment. It is explanatory
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drawing of the timing which reads the stored information from the non-volatile memory of
embodiment. It is explanatory drawing of the structure of the plug formed in the headphone
apparatus side of embodiment, and the jack formed in the reproducing apparatus side. It is an
explanatory view showing the details of power supply change of power amplifier of an
embodiment. It is the flowchart shown about the processing operation which should be
performed in a 1st embodiment. It is explanatory drawing of the format of the sensitivity
information of embodiment. It is explanatory drawing of the kind of headphone apparatus. It is a
block diagram of a 2nd embodiment. It is a block diagram of a 3rd embodiment. It is a block
diagram of a 4th embodiment. It is a block diagram of a 5th embodiment. It is a block diagram of
a 6th embodiment. It is explanatory drawing which showed the structure of the plug formed in
the headphone apparatus side in the case of providing the wireless tag of embodiment, and a tag
reader, and the jack formed in the reproducing apparatus side.
[0015]
Hereinafter, first to sixth embodiments of the present invention will be described in order. First
Embodiment FIG. 1 illustrates a first embodiment configured to include a playback device (audio
player device) 1 according to an embodiment of the present invention and a headphone device
20. Of the This block diagram shows the internal configuration of the reproduction device 1 and
the internal configuration of the headphone device 20, respectively.
[0016]
In FIG. 1, the playback device 1 is configured to be compatible with various types of headphone
devices as the headphone device 20 in the figure. Here, the type of headphone device 20 to
which the reproduction device 1 of the present example corresponds is shown in FIG.
[0017]
As shown in FIG. 8, the playback device 1 of this example is a headphone device such as (1)
headphone device of inner ear type, (2) headphone device of ear rest type, and (3) headphone
device type of ear cover type. It is connectable. These headphone devices have predetermined
sensitivities for each individual as shown in the figure.
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[0018]
The explanation is returned to FIG. First, the internal configuration of the headphone device 20
will be described. The headphone device 20 includes a connection plug 20A, a speaker 24, a nonvolatile memory 21, and a connection switching unit 8. The headphone device 20 is attached to
the playback device 1 by connecting the connection plug 20A to the connection jack 1A on the
playback device 1 side. The speaker 24 reproduces the audio signal supplied from the
reproduction device 1. This audio signal is supplied from the reproduction device 1 via the L / R
channel transmission path.
[0019]
The non-volatile memory 21 stores information on the sensitivity of the headphone device 20
(hereinafter, sensitivity information). The sensitivity information can be read out by the control
unit 6 described later. The sensitivity information is stored in the format of FIG. 7 as an example.
That is, 16 bits are allocated to the L channel R channel. The numerical values are stored in
absolute values of sensitivity. Thereby, it becomes possible to reproduce regulated sound
pressure for each individual headphone device 20.
[0020]
Next, the internal configuration of the playback device 1 will be described. As shown in FIG. 1,
the reproducing apparatus 1 includes a connection jack 1A, a storage unit 5, a decoder 3, a
power amplifier unit 2, a power supply voltage switching unit 2A, a plug connection detection
unit 7, a control unit 6, and a connection switching unit 8. . A connection plug 20A of the
headphone device 20 is connected to the connection jack 1A, and an L / R channel transmission
path for supplying an audio signal to the speaker 20 of the headphone device 20 is formed.
[0021]
The storage unit 5 is used to store various data including audio signal data. As a specific
configuration, for example, it may be configured by a solid state memory such as a flash memory,
or may be configured by, for example, an HDD (Hard Disk Drive). In addition, a recording medium
having portability, not a built-in recording medium, for example, a memory card incorporating a
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solid-state memory, an optical disc such as a CD (Compact Disc) or a DVD (Digital Versatile Disc),
a recording medium such as a magnetooptical disc or a hologram memory It can also be
configured as a drive device corresponding to Of course, both a built-in type memory such as a
solid state memory and an HDD, and a drive device for a portable recording medium may be
mounted. The storage unit 5 writes / reads out audio data and various other data based on the
control of the control unit 6. In the storage unit 5, for example, it is assumed that audio signal
data is stored in a compressed and encoded state by a predetermined audio compression
encoding method.
[0022]
The decoder 3 decompresses the compressed audio data read from the storage unit 5.
[0023]
The power amplifier unit 2 amplifies the audio signal output from the decoder 5 to a
predetermined power.
The amplification stage of the power amplifier unit 2 may be either a digital amplifier
configuration or an analog amplifier configuration. In the case of the analog amplifier
configuration, the output of the decoder 3 is subjected to D / A conversion and then amplification
processing of the analog voice signal is performed.
[0024]
The plug connection detection unit 7 detects whether or not the connection plug 20A and the
connection jack 1A are connected. For example, the plug connection detection unit 7 determines
the presence / absence of connection of the connection plug 20A based on whether or not a
predetermined voltage is detected. This determination signal is sent to the control unit 6.
[0025]
The power supply voltage switching unit 2 </ b> A switches the power supply voltage supplied to
the power amplifier unit 2. Details will be described later.
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[0026]
The control unit 6 performs read control of audio signal data stored in the storage unit 5, and
causes the decoder 3 and the power amplifier unit 2 to transmit audio signals to the headphone
device 20. Further, the control unit 6 reads out the sensitivity information of the non-volatile
memory 21 provided in the headphone device 20, switches the power supply voltage switching
unit 2A based on the sensitivity information, and powers the audio signal to have a
predetermined sound pressure. The switching control of the supply voltage of the amplifier unit
2 is performed. As a result, while maintaining the original performance of the headphone device,
it is possible to perform reproduction as per a predetermined regulated sound pressure.
[0027]
A connection switching unit 8 is provided in both the reproduction device 1 and the headphone
device 20. The connection switching unit 8 switches a path through which an audio signal flows
through the L / R channel and a path through which communication between the control unit 6
and the non-volatile memory 21 is performed. FIG. 2 shows the details. As illustrated, each
connection switching unit 8 is a switching switch inserted in the L / R channel transmission line.
The connection plug 1A and the connection jack 20A are provided with L channel terminals LP
and LJ, R channel terminals RP and RJ, and ground terminals GP and GJ, respectively. These are
the same as the configuration terminals of an ordinary stereo type plug / jack. In addition to this,
power supply / control terminals EP and EJ are provided.
[0028]
The connection terminals of each connection switching unit 8 are normally selected in the
illustrated state so as to form a transmission path of an audio signal from the power amplifier
unit 2 to the speaker 20. When the headphone device 20 is connected to the reproduction device
1, the connection switching unit 8 switches the connection terminal under the control of the
control unit 6. That is, when the control unit 6 detects the connection of the connection plug 1A
based on the signal from the plug connection detection unit 7 shown in FIG. 1, it outputs a
predetermined voltage level (H level) as a power supply / control signal. Each connection
switching unit 8 is configured to switch the connection terminal to the connection state for
memory communication when the power supply / control signal becomes H level.
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[0029]
Further, the power supply / control signal is supplied to the non-volatile memory 21 as an
operating power supply voltage. The ground line of the non-volatile memory 21 shares a
connection line formed by the ground terminals GP and GJ. When the power supply / control
signal becomes H level and the connection terminals of the connection switching unit 8 are
switched, the L / R channel transmission path connected by the L channel terminals LP and LJ
and the R channel terminals RP and RJ is controlled It becomes a state of being used as a
transmission line for exchanging the memory signals sm1 and sm2 between the unit 6 and the
non-volatile memory 21. Thus, the control unit 6 is connected to the non-volatile memory 21 via
the L / R channel, and the control unit 6 can read out the sensitivity information of the nonvolatile memory 21 by this connection. After completion of the reading, the control unit 6 sets
the power supply / control signal to the L level. Then, the connection switching unit 8 switches
the L / R channel to the path through which the audio signal flows, and the headphone device 20
can reproduce the audio signal. The above configuration means that the playback device 1 can
use the conventional connection plug 1A as it is. The control unit 6 can read out the sensitivity
information of the nonvolatile memory 21 without largely changing the terminal or the shape of
the connection plug 1A.
[0030]
FIG. 3 shows the timing at which the control unit 6 reads the sensitivity information of the
nonvolatile memory 21. In FIG. 3, the power supply / control signal is the control signal for
switching the switch of the connection switching unit as described above and the power supply
voltage of the non-volatile memory 21. During the period t1, the power supply / control signal is
at the H level, and the L / R channel is switched to a path for communication between the control
unit 6 and the non-volatile memory 21. In this state, a clock is supplied to the nonvolatile
memory 21 as the memory signal sm1 of the control unit 6. The sensitivity information is sent
from the non-volatile memory 21 to the control unit 6 as the memory signal sm2 in
synchronization with this clock. Based on the sensitivity information, the control unit 6 switches
the power supply voltage switching unit 2A during the period t2, and switches and controls the
supply voltage of the power amplifier unit 2 so as to obtain a predetermined sound pressure.
After t3, the power supply / control becomes L level, and the L / R channel is switched to the
path through which the audio signal flows, and the audio signal is transmitted.
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[0031]
FIG. 4 shows a specific example of the terminal structure of the connection plug 20A and the
connection jack 1A for connecting the headphone device 20 and the reproduction device 1. As
shown in FIG. The connection plug 20A and the connection jack 1A are fitted, and each terminal
is connected. In FIG. 4, first of all, an L-channel terminal LP and an R-channel terminal RP are
formed in the plug unit 20A on the headphone device 20 side as input terminals for the audio
signal supplied from the reproduction device 1 described above. ing. Further, a terminal EP for a
power supply / control signal which is a signal for switching the connection switching unit 8 is
formed. Furthermore, a ground terminal GP is formed which is common to the L channel, the R
channel and the power supply / control signal. Further, a projection is formed on the plug 20A
for positioning. At this time, the terminal LP, the terminal RP, and the terminal GP are formed so
as to be arranged coaxially and independently in a ring shape as shown in the figure. On the
other hand, the terminals EP for the power supply / control signal are provided coaxially with the
terminals LP, RP and GP on the same axis so as to project therefrom. .
[0032]
On the other hand, in the jack 1A on the audio player 1 side, a projection receiving portion for
fitting and positioning the projection is formed. That is, by forming the positioning portion, the
jack portion 1A and the plug portion 20A are connected in a predetermined positional
relationship. Although illustration of the ground terminals in contact with the L channel and R
channel and the ground terminal GP on the jack 1A side is omitted here for convenience of
illustration, these terminals are connected to the plug 20A. When this is done, as shown in FIG. 2,
it is formed in the jack portion 1A so as to be in one-to-one contact with the corresponding
terminal provided on the plug portion 20A side.
[0033]
In addition, the plug unit 20A on the headphone 20 side is formed with the terminal EJ for the
power supply / control signal described above. The terminals are provided such that when the
plug portion 20A is connected to the jack portion 1A so as to be positioned by the positioning
portion, the terminals are in one-on-one contact according to the correspondence relationship of
[EJ · EP]. There is.
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[0034]
By the structure of the plug portion 20A and the jack portion 1A as described in FIG. 4, when the
headphone 20 is connected to the reproducing apparatus 1, power is supplied to the non-volatile
memory 21 and the non-volatile property is The information stored in the memory 21 can be
read out by the control unit 6. In addition, it is possible to supply an audio signal from the
reproduction device 1 to the headphone device 20.
[0035]
FIG. 5 shows the details of the power supply switching unit 2A of the power amplifier 2. The case
of an analog amplifier and the case of a digital amplifier are shown as the power amplifier 2. FIG.
5A shows the case of an analog amplifier. In FIG. 5A, an analog audio signal is supplied to an
analog amplifier, amplified to a predetermined audio signal, and output. The analog audio signal
is a signal obtained by converting the signal output from the decoder 3 by a D / A converter (not
shown). Here, it is necessary to supply a voltage to operate the power amplifier 2 itself. At this
time, for example, in order to output a 5 V sine wave, it is necessary to supply a voltage of at
least 14 V (5 × √2 × 2). Therefore, in the case of FIG. 5A, it is necessary to supply -7V to 7V.
[0036]
If the voltage value of the voltage can be switched, a voltage of a necessary size can be supplied
in accordance with the audio output, and unnecessary voltage does not have to be consumed. In
FIG. 5A, switching of 1 ×, 1⁄2 ×, 1⁄4 × and 1/8 × is possible with respect to the supply voltage
(+ voltage, −voltage). This switching is performed by a control signal of the control unit 6. That
is, the control unit 6 reads out the sensitivity information from the non-volatile memory 21 of the
headphone device 20, and based on the sensitivity information, the control unit 6 switches the
voltage to be supplied to the analog amplifier by the control signal.
[0037]
For example, when 100 dB is stored as sensitivity information in the non-volatile memory 21 and
the sound pressure regulation value is 85 dB, the voltage output of the analog amplifier is 0.126
Vrms (= −18 dBV) at 100 dB sensitivity. Since the sound pressure regulation value is 85 dB with
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respect to this value, the voltage output of the analog amplifier is dBV value = −18−15 = −33
dBV, the execution value = 22.4 Vrms, and the peak value = 31.7 mV. Therefore, if the sensitivity
of the headphone device of 100 dB is known, the output of the analog amplifier does not exceed
31.7 mV on one side. This is shown in FIG. 5 (b).
[0038]
By calculating the peak value of 31.7 mV, for example, when the supply voltage is 0.5 V, it
becomes fully operable with the supply voltage of 62.5 mV which is 1⁄8 of the voltage. That is,
power consumption due to unnecessary voltage supply can be suppressed, regulation sound
pressure can be obtained without adopting a method of adding resistance in series to the audio
reproduction path, and sound quality deterioration and change in frequency characteristics are
avoided. it can.
[0039]
FIG. 5C shows the case of a digital amplifier. In FIG. 5 (c), digital audio output from the decoder 3
is supplied to a digital amplifier, amplified to a predetermined audio signal, and output. Since the
signal output from the power amplifier 2 is a digital signal, the signal is converted by a D / A
converter (not shown) and supplied to the headphone device 20 as an analog signal. The
switching of the supply voltage takes place in the same way as in the case of an analog amplifier.
FIG. 6D shows the output waveforms of the digital amplifier before switching the supply voltage
and when the supply voltage is halved.
[0040]
FIG. 6 is a flowchart showing the processing operation to be executed to realize the setting
(change) operation as the first embodiment described above. The processing operation in FIG. 6
is executed by the control unit 6 based on a program stored in, for example, a ROM.
[0041]
First, the control unit 6 detects power on or plug insertion. The control unit 6 executes a process
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of waiting until the plug is connected. When the control unit 6 detects power on or plug
insertion, the process of the control unit 6 moves to step S101. In step S101, the control unit 6
reads the sensitivity information from the non-volatile memory 21 provided in the headphone
device. For example, the reading is performed by the operation described in FIG. When the
control unit 6 reads the sensitivity information, the process of the control unit 6 moves to step
S102.
[0042]
In step S102, the control unit 6 performs processing to determine whether the sensitivity
information can be accommodated. When sensitivity information can not be handled, it is
assumed that the model is not compatible at that time, such as being newly released. In this case,
the control unit 6 proceeds to the process of step S201 and performs a process when it can not
cope with the process. For example, the display unit (not shown) causes the user to display a
warning, a firmware download instruction, and the like.
[0043]
If the sensitivity information can be handled in the determination process of step S102, the
control unit 6 proceeds to the process of step S103, and switches the supply voltage of the
amplifier voltage to 1/2 or 1/4 of that. That is, the switching setting of the power supply voltage
of the power amplifier unit 2 described in FIG. 5 is performed. Based on the sensitivity
information, the control unit 6 controls the adjustment of the power supply voltage of the power
amplifier unit 2 so that the audio signal supplied to the headphone device 20 is within the
allowable maximum output level. In the second to fifth embodiments to be described later, the
process of step S103 includes adjustment of the gain unit, adjustment of the limiter unit,
adjustment of the equalizer unit, adjustment of the compressor unit, or all of these four
adjustments. Etc.
[0044]
Thereafter, the control unit 6 performs reproduction control. That is, read control of data such as
music content from the storage unit 5 is performed, and the read audio data is supplied to the
headphone device 20 through the decoder 3 and the power amplifier unit 2.
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[0045]
According to the first embodiment described above, it is possible to automatically identify each
individual headphone device 20 to be used on the device side without user operation. At the
same time, the playback device can automatically perform appropriate sensitivity settings
according to the headphone device 20 to be used.
[0046]
In this manner, sensitivity setting according to the headphone device 20 to be used can be
automatically performed, and while reducing power consumption, the headphone device can
exhibit its original performance and reproduce it while maintaining its original sound quality at a
predetermined sound pressure. It becomes possible. For example, as described above, when the
supply voltage to the power amplifier is 0.5 V and the maximum voltage (zero peak voltage)
corresponding to the regulated sound pressure is 31.7 mV, a voltage of 0.5 V is supplied Instead,
it can supply 62.5 mV, which is a 1/8 voltage value. Resistance can be added to eliminate
inefficiencies such as heat energy.
[0047]
Second Embodiment Subsequently, a second embodiment will be described. In the first
embodiment described above, the sensitivity information unique to each predetermined type of
the headphone device 20 is provided in the non-volatile memory 21 in the headphone device 20,
and the sensitivity information is read out by the reproduction device 1 The power supply
voltage of the power amplifier 2 is switched based on the value to regulate the sound pressure.
That is, this is an example in which the adjustment to make the audio signal supplied to the
headphone device 20 be within the allowable maximum output level is performed in the form of
the adjustment of the power supply voltage of the power amplifier unit 2. In addition to this,
various examples of the adjustment may be considered for adjusting the audio signal supplied to
the headphone device 20 to be within the allowable maximum output level. The second to fifth
embodiments are examples in which the units other than the power amplifier unit 2 are caused
to function as an output sound pressure adjustment unit.
[0048]
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FIG. 9 is a block diagram of the second embodiment. In the following description, parts that are
the same as the parts already described will be assigned the same reference numerals and
descriptions thereof will be omitted. Here, based on the sensitivity information of the non-volatile
memory 21, the signal input to the power amplifier is subjected to the sound pressure regulation
of sound by adjusting the gain unit 9a. The audio signal output from the decoder 3 is supplied to
the power amplifier unit 2 after a predetermined gain is given by the gain unit 9a. Adjustment of
the gain unit 9a is performed by the control unit 6 using a control signal. The gain unit 9 a is
realized by, for example, a DSP (Digital Signal Processor) 9. The DSP 9 executes various digital
signal processing according to a program (not shown).
[0049]
The processing operation to be performed to realize the setting (change) operation as the second
embodiment will be described using FIG. 6 described above. The processes in steps S101, S102,
and S201 are the same as in the first embodiment. If the sensitivity information can be handled
in the determination process of step S102, the control unit 6 proceeds to the process of step
S103 based on the sensitivity information, and adjusts the gain unit 9a. The value of the gain to
be adjusted is a value that falls within the maximum output level that the audio signal supplied to
the headphone device 20 can allow. Thereafter, the control unit 6 performs the reproduction
process. Thereby, the sound pressure can be regulated while maintaining the original sound
quality.
[0050]
Third Embodiment Subsequently, a third embodiment will be described. FIG. 10 shows a third
embodiment. In the following description, parts that are the same as the parts already described
will be assigned the same reference numerals and descriptions thereof will be omitted. Here,
based on the sensitivity information of the non-volatile memory 21, the signal input to the power
amplifier is regulated by the limiter unit 9b to regulate the sound pressure of the sound. The
function of the limiter unit 9 b is realized by the DSP 9. In this case, the audio signal output from
the decoder 3 is supplied to the power amplifier unit 2 after the limiter unit 9 b applies limiter
processing at a predetermined limit level. Adjustment of the limit level of the limiter unit 9 b is
performed by the control unit 6 using a control signal.
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[0051]
The processing operation to be executed to realize the setting (change) operation as the third
embodiment will be described with reference to FIG. The processes in steps S101, S102, and
S201 are the same as in the first embodiment. If the sensitivity information can be handled in the
determination process of step S102, the control unit 6 proceeds to the process of step S103
based on the sensitivity information, and adjusts the limit level of the limiter unit 9b. The value of
the limit level to be adjusted is a value that falls within the maximum output level that the audio
signal supplied to the headphone device 20 can allow. Thereafter, the control unit 6 performs the
reproduction process. Thereby, the sound pressure can be regulated while maintaining the
original sound quality.
[0052]
Fourth Embodiment Subsequently, a fourth embodiment will be described. FIG. 11 is a block
diagram of the fourth embodiment. About the part which becomes the same as the part already
demonstrated, the same code ¦ symbol is attached ¦ subjected and description is abbreviate ¦
omitted. Here, based on the sensitivity information of the non-volatile memory 21, the signal
input to the power amplifier is adjusted in the equalizer unit 9c to change the frequency
characteristic to regulate the sound pressure of the sound. The function of the equalizer unit 9 c
is realized by the DSP 9. In this case, the audio signal output from the decoder 3 is supplied to
the power amplifier unit 2 after the frequency characteristic is adjusted by the equalizer unit 9 c.
Adjustment of the frequency characteristic of the equalizer unit 9c is performed by the control
unit 6 using a control signal.
[0053]
The processing operation to be executed to realize the setting (change) operation as the third
embodiment will be described with reference to FIG. The processes in steps S101, S102, and
S201 are the same as in the first embodiment. If the sensitivity information can be handled in the
determination process of step S102, the control unit 6 proceeds to the process of step S103
based on the sensitivity information, and adjusts the equalizer unit 9c. The selected frequency
characteristic is a characteristic that causes the level of the audio signal supplied to the
headphone device 20 to be within the allowable maximum output level according to the
sensitivity information. Thereafter, the control unit 6 performs the reproduction process.
Thereby, the sound pressure can be regulated while maintaining the original sound quality.
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[0054]
Fifth Embodiment Subsequently, a fifth embodiment will be described. In the second to fourth
embodiments described above, the non-volatile memory 21 in the headphone device 20 has
unique sensitivity information for each predetermined type of the headphone device 20, and the
reproducing device 1 performs the sensitivity information. The gain unit 9a, the limiter unit 9b,
and the equalizer unit 9c of the power amplifier input signal are independently adjusted based on
the read out value. In the fifth embodiment, an example in which the control unit 6 adjusts a
plurality of places will be described.
[0055]
FIG. 12 is a block diagram of the fifth embodiment. About the part which becomes the same as
the part already demonstrated, the same code ¦ symbol is attached ¦ subjected and description is
abbreviate ¦ omitted. Here, based on the sensitivity information of the nonvolatile memory 21,
the signal input to the power amplifier is adjusted to the gain unit 9a, the equalizer unit 9c, and
the compressor unit 9d, and the supply voltage to the power amplifier 2 is supplied to the power
supply voltage switching unit 2A. Is comprehensively adjusted to control the sound pressure of
the sound. The functions of the gain unit 9a, the equalizer unit 9c, and the compressor unit 9d
are realized by the DSP 9.
[0056]
In this case, the audio signal output from the decoder 3 is given a predetermined gain by the gain
unit 9a, adjusted in frequency characteristic by the equalizer unit 9c, and subjected to a
compressor process by the compressor unit 9d, and then supplied to the power amplifier unit 2.
The configuration is The gain value of the gain unit 9a, the frequency characteristic of the
equalizer unit 9c, the adjustment of the compressor unit 9d, and the switching control of the
power supply voltage switching unit 2A are performed by the control unit 6 using a control
signal. Here, the compressor unit 9d does not exceed the sound pressure regulation value, and
the dynamic range is intentionally reduced by the mechanism for gaining up when the large
sound is only the small sound without exceeding the sound pressure regulation value. To
produce a sense of At this time, it is better to calculate the optimum value from the headphone
sensitivity information or set it using a preset table value, since the impression is changed
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depending on the time constant such as attack or release.
[0057]
The processing operation to be executed to realize the setting (change) operation as the fifth
embodiment will be described with reference to FIG. The processes in steps S101, S102, and
S201 are the same as in the first embodiment. If it is possible to cope with the sensitivity
information in the determination process of step S102, the control unit 6 proceeds to the process
of step S103 based on the sensitivity information, adjusts the gain unit 9a, the equalizer unit 9c,
and the compressor unit 9d, and further to the power amplifier 2. Comprehensive control of
switching control of supply voltage. That is, as a control result of each part, the audio signal
supplied to the headphone device 20 is set to a value that falls within the allowable maximum
output level. Thereafter, the control unit 6 performs the reproduction process. Thereby, the
sound pressure can be regulated while maintaining the original sound quality.
[0058]
Here, although the control unit 6 comprehensively controls the four parts, three or two parts of
the gain unit 9a, the equalizer unit 9c, the compressor unit 9d, and the power supply voltage
switching unit 2A. An example of controlling It is also conceivable to control only the compressor
unit 9d so that the audio signal supplied to the headphone device 20 is within the allowable
maximum output level.
[0059]
Sixth Embodiment Subsequently, a sixth embodiment will be described. In the first embodiment
described above, the reading of the unique sensitivity information stored in the non-volatile
memory 21 of the headphone device 20 by the reproduction device 1 is performed by
connecting the connection plug 20A and the connection 1 jack A. Although it shall be performed
via each fitted terminal, another system is also considered. In the sixth embodiment, an example
in which the control unit 6 reads the sensitivity information by wireless communication will be
described.
[0060]
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FIG. 13 shows a sixth embodiment. About the part which becomes the same as the part already
demonstrated, the same code ¦ symbol is attached ¦ subjected and description is abbreviate ¦
omitted. The wireless tag 22 is provided on the headphone device 20 side. The sensitivity
information is stored here. The reproduction device 1 is provided with a tag reader 10. The
sensitivity information of the wireless tag 22 is read by the tag reader 10. That is, when the
headphone device 20 is connected to the reproduction device 1, the tag reader 10 accesses the
wireless tag 22 by near field communication, and reads the stored sensitivity information. Then,
the tag reader 10 transmits the read sensitivity information to the control unit 6. Based on the
sensitivity information, the control unit 6 performs the same control operation as in the first to
fifth embodiments.
[0061]
FIG. 14 shows a structural example of the connection jack portion 1A formed in the reproduction
device 1 of the first embodiment and the connection plug portion 20A formed on the headphone
device 20 side. As illustrated, a wireless tag 22 is provided inside the connection plug unit 20A in
the headphone device in this case. In addition, the connection jack unit 1A in the reproduction
device 1 is provided with a tag reader 10 for reading information stored in the wireless tag 22 by
wireless communication (non-contact).
[0062]
In this case, the wireless tag 22 is a so-called passive type, and when the power is supplied by
radio wave irradiation by the tag reader 8, the stored data of the internal memory element is
transmitted by radio wave. The tag reader 10 reads data sent from the wireless tag 22 in
response to radio wave irradiation.
[0063]
Here, each of the wireless tag 22 and the tag reader 10 is provided in such a positional
relationship as to fall within the communicable range when at least the plug portion is connected
to the jack portion.
[0064]
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Further, in this case, since the data communication line and the line for supplying power are not
necessary when reading the information stored in the headphone device 20, this is provided in
the case of the first embodiment described above. The power supply / control terminals on the
jack portion 1a side and the plug portion 20A side can be omitted.
The processing operation to be performed to realize the setting (alteration) operation shown in
FIG. 6 as the sixth embodiment is the same as that of the first to fifth embodiments.
[0065]
DESCRIPTION OF SYMBOLS 1 reproduction apparatus, 1A connection plug, 2 power amplifier, 3
decoder, 5 storage unit, 6 control unit, 7 plug connection detection unit, 8 connection switching
unit, 9 DSP, 9a gain unit, 9b limiter unit, 9c equalizer unit, 10 Tag reader, 20 headphone devices,
20A connection jack, 21 nonvolatile memory, 22 wireless tags
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