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DESCRIPTION JP2005150816

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DESCRIPTION JP2005150816
PROBLEM TO BE SOLVED: To provide a hands-free device capable of setting an attenuation
amount of a speaker attenuator in accordance with a call condition with a destination telephone.
SOLUTION: A hands-free device 1 selects and sets attenuation amounts of a mobile telephone
body 2, a Tx attenuator 16 for a microphone 6, an Rx attenuator 17 for a speaker 7, and a Tx
attenuator and an Rx attenuator. It consists of Furthermore, the attenuation amount storage unit
12 connected to the attenuator control unit and the other-side telephone determination unit 14
for determining the type of the other-side telephone are provided. In addition, the hands-free
device 1 is connected to the navigation system 5, and the attenuator control unit reads out the
current position data from the current position detection unit 21 composed of a GPS device. In
the case of a fixed telephone, the attenuator control unit selects and sets the attenuation from the
attenuation storage unit based on the area code and the current position according to the type of
the telephone. [Selected figure] Figure 1
Hands free device
[0001]
The present invention relates to a hands-free device for realizing so-called hands-free calling,
which allows a telephone to talk without touching the device.
[0002]
In recent years, as telephones have become multifunctional, many home telephones have handsfree functions.
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According to this hands-free function, even when the user of the telephone is blocked, it is
possible to make a call without giving up. A hands free circuit is incorporated in the telephone to
realize the hands free function. In the handsfree circuit, the other party's voice enters the
microphone through the speaker at the other party's phone so that the other party's voice does
not cause feedback or echo from the speaker at the other party's phone. It is a circuit devised so
as not to cause such an echo. In the analog circuit, howling occurs because the phase of the input
signal and that of the loop signal substantially match. In the digital circuit, the input signal is
delayed by calculation processing and generates echo.
[0003]
When such a phenomenon occurs, it interferes with a normal call, so the handsfree circuit talks
to you, and when the other party is not speaking, the other party goes around from the speaker
to the microphone and enters A speaker attenuator is incorporated to properly attenuate the
signal returning to the side speaker. Also, conversely, when the other party speaks and you are
not speaking, there is a microphone attenuator that appropriately attenuates the signal sent from
the speaker to the microphone on your side and sent to the other party's speaker. It has been
incorporated.
[0004]
By the way, the conventional techniques as described above have the following problems to be
solved. The attenuation control of the attenuator for attenuating the transmission voice signal on
the own side and the reception voice signal from the other party is dynamically controlled by the
attenuator control unit. That is, the attenuator control unit monitors the transmission voice signal
level and the reception voice signal level of its own side, and when either one of the own side or
the other side emits a voice, the speaker attenuator or the microphone attenuator is used. Make
one work. At this time, one of the attenuators attenuates the input signal by the set amount, and
the other attenuator outputs the input signal without attenuation.
[0005]
When such control is performed during a call, the attenuator operates alternately each time the
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voice emitting side changes. However, with this, there is a problem that the sound outputted from
the speaker for listening to the receiving voice suddenly and loudly becomes small and it
becomes difficult to listen so as to cause a sense of discomfort.
[0006]
Therefore, the attenuation amount of the microphone attenuator and the speaker attenuator can
be variably controlled in multiple steps, and the attenuator control unit compares the
transmission voice signal input level with the reception voice signal input level to obtain an
attenuation amount setting unit in advance. A handsfree device is disclosed that selects an
attenuation amount from the set attenuation amount and controls a microphone attenuator and a
speaker attenuator (see Patent Document 1). Unexamined-Japanese-Patent No. 11-298597
[0007]
However, the technology disclosed in Patent Document 1 compares the transmission voice signal
input level and the reception voice sound signal input level, and selects and sets from the
attenuation amount determined in advance, according to the call situation. There is a problem
that it is not possible to set the attenuator to maintain the detailed call quality.
[0008]
An object of the present invention is to provide a hands-free device capable of setting the
attenuation amount of the attenuator in accordance with the communication situation with the
other party in order to solve the above-mentioned problems.
[0009]
Therefore, the present invention attenuates an audio signal from the other party by a set amount
and outputs it to the speaker of the telephone set on its own side, and an attenuator control unit
for setting and controlling the attenuation amount of the speaker attenuator. The handsfree
device includes an attenuation amount storage unit for storing in advance an attenuation amount
corresponding to the telephone number of the other party's telephone, and the attenuator control
unit stores the attenuation amount based on the telephone number of the other party's telephone
The amount of attenuation was selected from the part and set.
[0010]
According to the present invention, since it is possible to cope with the call situation which can
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be specified from the telephone number of the other party's telephone, fine and optimum call
quality can be ensured.
[0011]
Hereinafter, embodiments of the present invention will be described by way of examples.
[0012]
FIG. 1 is a block diagram of the hands-free apparatus according to the first embodiment.
The hands-free device 1 comprises a mobile telephone body 2, a Tx attenuator 16 for attenuating
the transmission voice signal level from the microphone 6 by a predetermined amount and
outputting it to the mobile telephone body 2, and a reception voice signal level from the mobile
telephone body 2 by a predetermined amount. It consists of an Rx attenuator 17 for attenuating
and outputting to the speaker 7, an attenuator control unit 15 for controlling the attenuation of
the audio signal level by variably setting the attenuation amount in the Tx attenuator 16 and the
Rx attenuator 17.
[0013]
The hands-free device 1 further includes an attenuation amount storage unit 12 connected to the
attenuator control unit 15 and an opposite-side telephone determination unit 14 that determines
the type of the other-side telephone.
In addition, the hands-free device 1 is connected to the navigation system 5, and the attenuator
control unit 15 reads the current position data from the current position detection unit 21
composed of a GPS device.
[0014]
Each configuration will be described in more detail below.
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The mobile telephone main body 2 is provided with an input unit such as a power switch, call
start / end switch, numeric key, cursor movement switch, decision switch, not shown, a display, a
non-volatile memory, and reception, transmission by number input, non-volatile memory Various
functions of the mobile telephone main body 2 can be set or changed by using the input unit in
addition to the ordinary call function of the outgoing call by selecting the stored telephone
number.
[0015]
As an example of various functions, it has a function of causing the attenuator control unit 15 to
change the transmission voice signal level, reverse the reception voice signal level, or store the
level in the non-volatile memory using the input unit. is there.
In this embodiment, the attenuation amount storage unit 12 stores the attenuation amount of the
Tx attenuator 16 and the Rx attenuator 17 corresponding to the transmission voice signal level
or the reception voice signal level thus set in a predetermined format. Have.
[0016]
The attenuator control unit 15 inquires the current position from the current position detection
unit 21 of the navigation system 5 as needed according to the other party's telephone number of
the incoming call or the other party's telephone number when making a call, and the other
party's phone Based on the number or the other party's telephone number and the current
position information of the other party, the attenuation amount of the appropriate Tx attenuator
16 and Rx attenuator 17 is retrieved from the attenuation amount storage unit 12 and selected
and set.
[0017]
The attenuation amount storage unit 12 stores and holds the attenuation amount of the Tx
attenuator 16 and the Rx attenuator 17 in a table format as shown in FIG. 2 so that the
attenuator control unit 15 can select the attenuation amount according to the telephone number.
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Although this data can be changed by the operation of the input unit of the mobile telephone
main body 2, it is convenient to store it in advance at the time of shipment.
If the other party's telephone set is a fixed line telephone set of a general line, as shown in the
table of (a), from the left of the column: (1) area code; (2) corresponding address of area code; 3)
The current position of the user is stored, for example, in the following order: prefecture name,
(4) speaker setting value for attenuator attenuation amount, and (5) microphone setting value for
attenuator attenuation amount. In addition, displaying the current position where you are in the
column (3) by the prefecture name is where the name of the place is displayed to make it easy
for the user to understand when the stored data is displayed on the display, The attenuation
amount storage unit 12 also stores a code corresponding to a place name not displayed.
[0018]
If the other party's telephone set is a mobile telephone set, as shown in the table of FIG. 2B, from
the left of the column, (1) the beginning number of the mobile telephone, for example "090" or
"070", (4) attenuator The attenuation setting values for loudspeakers and (5) Attenuation
attenuation microphone settings are stored in this order. Data in the fields (2) and (3) are blank.
In this case, at the time of shipment, it is assumed that the other party's telephone set and its
own side telephone set are also mobile telephones of a telecommunications carrier with a large
market share, and attenuation amounts of attenuators are stored as standard settings assuming
use in the metropolitan area I will let you. Since mobile phones are often provided with an
automatic adjustment function of voice quality such as voice level compared to fixed phones,
they are less affected by the location of the other party's phone, such a standard Setting the
attenuation is sufficient.
[0019]
If it is not possible to obtain the other party's telephone number when it is received, as shown in
the table of (c) of FIG. 2, from the left of the column, (4) Speaker setting value for attenuator
attenuation, (5) The attenuation attenuation microphone settings are stored in order. The data in
the columns of (1), (2) and (3) are blank. In this case, it is assumed that the other party's
telephone set is a fixed-line telephone of a general line, the own telephone set is a mobile
telephone, and the other party's telephone set and its own telephone set are also telephones of
communication carriers with large market share. Then, the attenuation amount of the attenuator
is set as a standard and stored assuming that it is used in the metropolitan area. As described
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above, the possibility of using this hands-free device by storing preset standard attenuation
amounts for use in the metropolitan area for telephones of communication carriers with a large
market share as a target Attenuation settings which are convenient for high users can be stored.
[0020]
The other party's telephone determination section 14 determines whether the other party's
telephone set is a fixed line telephone or a mobile telephone based on the other party's telephone
number when the mobile phone main body 2 receives or when making a call back. To determine
The determined result is input to the attenuator control unit 15.
[0021]
The navigation system 5 has a usual road map data storage and map search function, a road
guidance function, a route setting function, and a current position detection function by the
current position detection unit 21. Attenuation control unit 15 receives questions about the
current position. When it does, the present position is verified on the map, for example, the
prefecture name is judged and it responds with the predetermined code corresponding to the
prefecture name.
[0022]
In the actual configuration, the other party telephone determination unit 14 and the attenuator
control unit 15 are configured by one CPU, and the attenuation amount storage unit 12 is a nonvolatile memory connected to the CPU.
Also, this CPU may be shared with the CPU of the mobile telephone main body 2.
[0023]
In FIG. 1, a wireless base station 31 in wireless communication with the mobile telephone main
body 2 on the own side, a communication network 8 connected to the wireless base station 31, a
destination fixed telephone 3 connected to the network 8, and a network 8 are connected. The
other party mobile telephone 4 wirelessly connected to the radio base station 32 is shown.
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[0024]
The operation of this embodiment will be described below.
FIG. 3 is a flow chart showing a flow of control for setting the attenuation amount of the
attenuator when making or receiving a call with the handsfree device. In step 101, the mobile
telephone main body 2 determines whether it is an incoming call or an outgoing call. In the case
of an incoming call, the process proceeds to step 102, and in the case of an outgoing call, the
process proceeds to step 103. In step 102, the mobile telephone main body 2 checks whether the
other party's telephone number, ie, the incoming telephone number can be obtained from the
received signal. The detection of the incoming call number is performed in accordance with the
sequence of the radio base station and the mobile telephone described in, for example, the digital
cellular phone common specification. If it is determined in step 102 that the other party's
telephone number can be obtained, the process proceeds to step 103. If it can not be acquired,
the process proceeds to step 109, and the setting value for the microphone when the attenuator
control unit 15 can not acquire the incoming telephone number of FIG. 2C from the storage
storage data of the attenuation amount storage unit 12. And the attenuation value of the
attenuator for each of the speaker setting values. Thereafter, the process proceeds to step 107.
[0025]
In step 103, the other party's telephone determination unit 14 checks the other party's telephone
number, that is, the first three digits of the incoming telephone number or the called party's
telephone number, and the other party's telephone number is a fixed telephone or moves
Determine if it is a phone call. If the first three digits of the telephone number are "070" or "090",
it is determined that it is a mobile telephone, and the process proceeds to step 110; otherwise it
is determined that it is a fixed telephone and it proceeds to step 104 . In step 110, the attenuator
control unit 15 selects the attenuation amount of the attenuator for each of the microphone
setting value and the speaker setting value corresponding to the mobile telephone shown in FIG.
2B from the storage storage data of the attenuation amount storage unit 12. Do. Thereafter, the
process proceeds to step 107.
[0026]
In step 104, the attenuator control unit 15 reads out the area code from the telephone number of
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the other party, and specifies the location of the other party's telephone. For example, if the first
two digits of the telephone number are "03", the three digits are "044", "045", and "046" as
Kanagawa. In step 105, the attenuator control unit 15 acquires the code corresponding to the
prefecture name corresponding to the current position from the current position detection unit
21, and specifies the current position of the telephone set on the user side, that is, the mobile
telephone 2. In step 106, the attenuator control unit 15 stores the data of FIG. 2A stored in the
attenuation amount storage unit 12 based on the specified location of the fixed telephone set on
the opposite side and the current position of the own side, that is, one's own position. Then, the
attenuation amount of the attenuator for each of the microphone setting value and the speaker
setting value is selected. Thereafter, the process proceeds to step 107.
[0027]
In step 107, the attenuator control unit 15 sets the Tx attenuator 16 and the Rx attenuator 17 to
the attenuations of the selected microphone setting value and speaker setting value. After step
107, at step 108, the mobile phone body 2 starts a call. The Rx attenuator 17 of the present
embodiment corresponds to a speaker attenuator.
[0028]
As described above, according to the present embodiment, the type of the fixed telephone or the
mobile telephone is determined from the telephone number of the other party, and in the case of
the mobile telephone, it is set to the attenuation amount of the standard attenuator of the mobile
telephone. When the other party is a fixed telephone, the attenuation amount of the stored
attenuator can be selected reflecting the characteristics depending on the distance of the fixed
telephone line from the location of the other party and the current position of the other party, so
the attenuation amount of attenuator The optimum setting value of can be selected.
[0029]
FIG. 4 is a block diagram of the handsfree device of the second embodiment. About the same
composition as a 1st example, the same numerals are attached and explanation is omitted. The
hands-free device 1 'includes the mobile telephone body 2, the Tx attenuator 16, the Rx
attenuator 17, the attenuator control unit 15', and a telephone number / attenuation amount
registration unit 12 'that stores and stores the attenuation amount corresponding to the
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registered telephone number. It consists of
[0030]
The telephone number / attenuation amount registration unit 12 'stores and holds the
attenuation amount of the Tx attenuator 16 and the Rx attenuator 17 in a table format as shown
in FIG. 5 so that the attenuator control unit 15' can select the attenuation amount according to
the telephone number. There is. For example, from the left of the column of the table, (1) a series
of fixed telephone numbers or mobile telephone numbers from the area code, (2) name of the
other party, (3) type of telephone, ie fixed telephone / mobile telephone (4 ) The name of the
carrier of the mobile telephone (mobile unit carrier), (5) speaker setting value of attenuator
attenuation amount, and (6) microphone setting value of attenuator attenuation amount are
stored in this order. This data is stored in advance when the user operates and sets the input unit
of the mobile telephone main body 2 to the optimum attenuation amount of attenuation when
making a call once. The telephone number / attenuation amount registration unit 12 'may also be
used as a non-volatile memory in which the user of the mobile telephone main body 2 registers a
telephone number.
[0031]
The operation of this embodiment will be described below. FIG. 6 is a flow chart showing a flow
of control for setting the attenuation amount of the attenuator when making or receiving a call
with the handsfree device. At step 201, the mobile phone body 2 determines whether it is an
incoming call or an outgoing call. In the case of an incoming call, the process proceeds to step
202, and in the case of an outgoing call, it proceeds to step 203. At step 202, the mobile
telephone main body 2 checks whether the other party's telephone number, ie, the incoming
telephone number can be obtained from the received signal. In step 202, when the telephone
number of the other party can be acquired, the process proceeds to step 203, and when the
telephone number can not be acquired, the process proceeds to step 207.
[0032]
In step 203, the attenuator control unit 15 'checks whether the other party's telephone number,
that is, the incoming telephone number or the called party's telephone number is a telephone
number registered in the telephone number / attenuation amount registration unit 12'. . If it is
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registered, the process proceeds to step 204. If it is not registered, the process proceeds to step
207. In step 204, the attenuator control unit 15 'selects the attenuation amount of the attenuator
for each of the microphone setting value and the speaker setting value corresponding to the
telephone number from the storage / storage data of the telephone number / attenuation amount
registration 12'. Thereafter, the process proceeds to step 205.
[0033]
After step 202 or step 203, when the process proceeds to step 207, the attenuator control unit
15 'uses the standard microphone setting value and the speaker setting value assuming that the
other party's telephone set is a fixed telephone in Tokyo as the attenuation amount of the
attenuator. Select Thereafter, the process proceeds to step 205.
[0034]
In step 205, the attenuator control unit 15 'sets the Tx attenuator 16 and the Rx attenuator 17 to
the attenuation amounts of the selected microphone setting value and speaker setting value.
After step 205, at step 206, the mobile phone body 2 starts a call. The Rx attenuator 17 of the
present embodiment corresponds to a speaker attenuator.
[0035]
The setting of the optimum attenuation of the attenuator for the microphone and the speaker in
the hands-free device is based on the total balance of the voice level from the other party, the
voice level on the other party, the voice quality, and the echo characteristics of the telephone and
line. It is decided. If you want to suppress the echo, you can reduce the voice level of the send
and receive voice, but then it will be difficult to hear. Since the echo characteristics also depend
on the characteristics of the telephone set and the telephone line, the optimum setting value of
the attenuator can not be determined simply by the transmission voice signal input level and the
reception voice signal input level. Further, since the reception voice signal level also differs
depending on the size of the voice of the other party, it is more difficult to select the optimum
setting value of the attenuation amount of the attenuator.
[0036]
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As described above, according to the present embodiment, from the telephone number of the
other party, whether the other party's telephone number is the fixed telephone or the mobile
telephone, or in the case of the fixed telephone, the characteristics depending on the location of
the other party. Since the attenuation of the attenuator set at the time of the call is registered and
stored together with the other party's phone number in consideration of the voice characteristics
of the other party, the phone number already registered at the next call or reception. If so, it is
possible to automatically select the optimum attenuation amount of the attenuator.
[0037]
Note that the combination of the first embodiment and the second embodiment shows that the
attenuator control unit is configured to register the telephone number / attenuation amount
when the other party's telephone number is registered in the telephone number / attenuation
amount registration unit 12 '. The attenuation amount of the attenuator may be selected from the
registration unit 12 ′ based on the telephone number, and when it is not registered, the
attenuation amount of the attenuator may be selected as in the attenuator control unit 15 of the
first embodiment.
As a result, when calling or receiving a specific party at a high frequency from within the current
location area, a hands-free phone can be made with the setting of the optimum attenuator for
each registered individual phone number and registered. Also in the case of a call with a nonother party, in the case of a fixed telephone, the setting of the attenuator reflecting the location
of the other party is made, and a call with good voice quality can be made.
[0038]
It is a figure which shows the block configuration of the handsfree apparatus of the 1st Example
of this invention. It is a table explaining the data storage form of the amount storage part of
attenuation of a 1st example. It is a flowchart which shows the flow of control which selects the
attenuation amount of the attenuator of 1st Example. It is a figure which shows the block
configuration of the handsfree apparatus of the 2nd Example of this invention. It is a table
explaining the data storage form of the telephone number / attenuation amount registration part
of a 2nd Example. It is a flowchart which shows the flow of control which selects the attenuation
amount of the attenuator of 2nd Example.
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Explanation of sign
[0039]
1, 1 'hands-free device 2 mobile telephone main body 3 remote telephone set 4 remote mobile
telephone 5 navigation system 6 microphone 7 speaker 8 network 12 attenuation storage 12'
telephone number / attenuation register 14 remote telephone identification Unit 15, 15
'Attenuator control unit 16 Tx attenuator 17 Rx attenuator 21 Current position detection unit 31,
32 Radio base station
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