JP5847006B2 - Mobile communication terminal - Google Patents

Description

  The present invention relates to a technique for a mobile communication terminal having a noise reduction function.

The mobile communication terminal is assumed to be used in places where there is relatively large noise, such as downtowns and station buildings. For this reason, some portable communication terminals having a call function include noise reduction means for reducing voice components other than the voice of the user who uses the terminal.
For example, Patent Document 1 includes a first microphone, a second microphone, and a proximity sensor, and when the proximity sensor detects the proximity of the user's head, the sound around the terminal collected by the second microphone. A portable communication terminal that removes a voice component other than a user's voice from a voice signal collected from a first microphone by mixing a signal having a phase opposite to that of the voice signal collected by the first microphone. The technology is described.

JP 2010-81495 A

  However, according to the mobile communication terminal described in Patent Document 1, when the user attempts a call with the mouth away from the first microphone, the volume level of the user's voice input to the first microphone is When the volume level of the user's voice that is input by wrapping around the second microphone becomes the same level as each other, even the sound component of the user's voice is removed by the noise reduction means, or It will be reduced relatively significantly.

  Therefore, the present invention has been made in view of such problems, and in a mobile communication terminal having a call function and including noise reduction means, the voice component of the user's voice by the noise reduction means is significantly larger than that in the past. An object of the present invention is to provide a mobile communication terminal in which reduction is less likely to occur.

  In order to solve the above-described problem, a mobile communication terminal according to the present invention is a mobile communication terminal that transmits a call signal based on an output signal of a built-in microphone to an external communication device, and is disposed apart from the microphone. Based on the sub microphone, the output signal of the microphone, and the output signal of the sub microphone, a noise reduction unit that generates a noise reduction signal in which a noise component included in the signal is reduced from the output signal of the microphone, An inclination measurement unit that measures the inclination of the terminal; and the output signal of the microphone and the output signal of the microphone so that the output signal of the microphone is selected when the inclination measured by the inclination measurement unit is not within a predetermined range. A selection unit that selectively selects a noise reduction signal generated by the noise reduction unit; and the signal selected by the selection unit is transmitted to the external communication device. And a sending unit for signal for.

  In the mobile communication terminal according to the present invention, the volume level for the user's voice input from the microphone is relatively large by the noise reduction unit than the volume level for the user's voice input from the sub microphone. By setting the range so as not to be significantly reduced, it is possible to make it difficult for the noise reduction unit to significantly reduce the voice component of the user's voice by the noise reduction unit.

(A) Perspective view of mobile phone 100 viewed from front side main surface side (described later), (b) Perspective view of mobile phone 100 viewed from back side main surface side (described later). Sectional view of the mobile phone 100 as seen from the side on the long side The block diagram which shows the circuit structure of the mobile telephone 100 The block diagram which shows the function structure of the noise reduction functional block 400 A perspective view of the mobile phone 100 in which directions of three axes (X axis, Y axis, Z axis) are written together. Schematic diagram of a projected image obtained by projecting mobile phone 100 used for a call onto a Y-axis orthogonal plane Selection process flowchart The block diagram which shows the function structure of the deformation noise reduction functional block 800 Schematic diagram of a projected image of a deformed mobile phone used for a call projected on an X-axis orthogonal plane Flow chart of deformation selection process Perspective view of mobile phone 1100

<Embodiment>
<Overview>
Hereinafter, as an example of the mobile communication terminal according to the present invention, a microphone 210 and a sub microphone 230 are provided, and a noise component (user) included in the output signal of the microphone 210 based on the output signal of the microphone 210 and the output signal of the sub microphone 230. A mobile phone 100 having a function of performing a noise canceling process for reducing a voice component other than the voice of) will be described.

  The cellular phone 100 further includes a proximity sensor 250 and an acceleration sensor 240, and the proximity sensor 250 detects that the head of the user who uses the terminal and the terminal are close to each other. In this case, the noise canceling process is performed only when the acceleration sensor 240 detects that the inclination of the own terminal with respect to the vertical direction is within a predetermined range.

Hereinafter, details of the configuration of the mobile phone 100 will be described with reference to the drawings.
<Configuration>
The mobile phone 100 is a so-called smartphone-type mobile phone having a substantially rectangular parallelepiped casing, and the operation surface of the touch panel 130 is disposed on one main surface of the casing.
FIG. 1A is a perspective view of the mobile phone 100 as viewed from the main surface (hereinafter referred to as “front main surface”) side of the casing on which the operation surface of the touch panel 130 is disposed. FIG. 4B is a perspective view of the mobile phone 100 as viewed from the other main surface (hereinafter referred to as “back side main surface”) side of the casing facing the front side main surface.

As shown in FIG. 1A, the mobile phone 100 has an operation surface of the touch panel 130, a microphone hole 110, and a receiver hole 120 on the front main surface of the casing. And as FIG.1 (b) shows, it has the sub microphone hole 140 in the position which opposes the receiver hole 120 among the back side main surfaces of the housing | casing.
FIG. 2 is a cross-sectional view of the mobile phone 100 as viewed from the long side surface.

  As shown in the figure, the mobile phone 100 includes a microphone 210, a receiver 220, a sub microphone 230, a touch panel 130, an acceleration sensor 240, a proximity sensor 250, a substrate 260, an antenna assembly 291, and a battery 292. Further, electronic components such as a communication LSI (Large Scale Integration) 261, a memory 262, a CPU (Central Processing Unit) 263, a peripheral IC (Integrated Circuit) 264, a touch panel controller 265, and the like are arranged on the substrate 260. Yes. The touch panel 130 is configured by placing a transparent touch pad 270 on the display surface of the liquid crystal display 280, and the antenna structure 291 includes an antenna 320 made of a metal thin film (not shown in FIG. 2). Z.) is arranged.

FIG. 3 is a block diagram showing a circuit configuration of the mobile phone 100.
The microphone 210 is connected to the CPU 263 and has a function of converting sound input from the outside of the housing through the microphone hole 110 (see FIGS. 1 and 2) into an electrical signal and sending the converted electrical signal to the CPU 263.
The sub microphone 230 is connected to the CPU 263, and has a function of converting sound input from the outside of the housing through the sub microphone hole 140 (see FIGS. 1 and 2) into an electric signal and sending the converted electric signal to the CPU 263.

The receiver 220 is connected to the CPU 263, is controlled by the CPU 263, converts an electrical signal sent from the CPU 263 into sound, and outputs the converted sound to the outside of the housing through the receiver hole 120 (see FIGS. 1 and 2). It has a function.
The proximity sensor 250 is connected to the CPU 263 and is controlled by the CPU 263 to detect the approach of an object having a large capacitance such as the head of the human body (hereinafter simply referred to as “the human head”). A proximity signal which is a digital signal for detecting the proximity of a unit or the like is sent to the CPU 263. The proximity sensor 250 is, for example, a capacitive proximity sensor that can be easily obtained from the market (a sensor that detects the approach of the detection body by detecting a change in the electrical capacitance due to the approach of the detection body). Can be easily created.

  The acceleration sensor 240 is connected to the CPU 263 and controlled by the CPU 263, and has a function of detecting the vertical direction and sending tilt information, which is a digital signal indicating the detected vertical direction, to the CPU 263. Here, the inclination information is obtained by using an X-axis component signal, a Y-axis component signal, and a Z-axis indicating three axial components (X-axis, Y-axis, and Z-axis: respective axial directions will be described later). It is composed of axis component signals. The acceleration sensor 240 can be easily created using, for example, a three-axis acceleration sensor that can be easily obtained from the market.

The antenna 320 is a monopole antenna made of a metal thin film that is connected to the communication LSI 261 and used for communication performed by the communication LSI 261.
The communication LSI 261 is connected to the antenna 320 and the CPU 263, is controlled by the CPU 263, modulates a transmission signal sent from the CPU 263, and transmits the modulated signal to an external device using the antenna 320. It has a transmission function to transmit, a reception function to receive a signal transmitted from an external device using the antenna 320, and a demodulation function to demodulate the received signal and send it to the CPU 263.

The touch pad 270 is connected to the touch panel controller 265, is controlled by the touch panel controller 265, and is a transparent touch pad including a transparent electrode (for example, made of ITO (Indium Tin Oxide)), and is displayed on a liquid crystal display. Touch panel 130 is formed by being superimposed on the surface.
The liquid crystal display 280 is a liquid crystal display connected to the touch panel controller 265 and controlled by the touch panel controller 265, and the touch pad 270 is superimposed on the display surface to form the touch panel 130.

  The touch panel controller 265 is connected to the CPU 263, the touch pad 270, and the liquid crystal display 280, is controlled by the CPU 263, and has a display function for causing the liquid crystal display 280 to display an image based on an image signal sent from the CPU 263, and the mobile phone 100. A user who uses the touchpad 270 converts the user operation performed using the touch pad 270 into an electrical signal and sends it to the CPU 263.

The peripheral IC 264 is connected to the CPU 263, is controlled by the CPU 263, and has a timer function for measuring the passage of time.
The memory 262 is connected to the CPU 263 and stores a program that defines the operation of the CPU 263 and data used by the CPU 263.
The CPU 263 is connected to the microphone 210, the receiver 220, the sub microphone 230, the acceleration sensor 240, the proximity sensor 250, the communication LSI 261, the memory 262, the peripheral IC 264, and the touch panel controller 265, and two analog-digital converters and one digital-analog converter. And the acceleration sensor 240, the proximity sensor 250, the communication LSI 261, the peripheral IC 264, and the touch panel controller 265 are controlled to execute the following two functions by executing a program stored in the memory 262. .

  Mobile phone control function: The mobile phone 100 realizes functions equivalent to general functions as a mobile phone of a conventional smartphone type mobile phone, such as a call function, an Internet site browsing function, a mail transmission / reception function, a standby function, etc. Function to let you. This mobile phone control function is realized by the CPU 263 executing a program stored in the memory 262.

  Noise reduction function: When the mobile phone 100 is in a call state with an external mobile phone, the degree of inclination with respect to the vertical direction detected by the acceleration sensor 240 when the proximity sensor 250 detects the approach of the human head or the like Is within a predetermined range (described later), the noise reduction signal in which the noise component included in the signal is reduced from the output signal of the microphone 210 by subtracting the output signal component of the sub microphone 230 from the output signal of the microphone 210. And using the generated noise reduction signal as an audio signal in the call. This noise reduction function is realized by the CPU 263 executing a program stored in the memory 262 to cause the mobile phone 100 to perform a selection process described later. This selection process will be described later in detail with reference to a flowchart in the item <Selection process>.

FIG. 4 is a block diagram showing a functional configuration of a noise reduction function block 400 that realizes the noise reduction function. The noise reduction function block 400 is realized by the CPU 263 executing a program stored in the memory 262.
As shown in the figure, the noise reduction function block 400 includes a first analog-digital conversion unit 410, a second analog-digital conversion unit 420, a digital-analog conversion unit 430, a noise cancellation unit 440, a selection unit 450, and a tilt determination unit 460. And a handle information holding unit 470 and an inclination range information holding unit 480.

The first analog-digital conversion unit 410 is connected to the microphone 210, the noise cancellation unit 440, and the selection unit 450, converts an analog electric signal sent from the microphone 210 into a digital signal, and the noise cancellation unit 440 and the selection unit. 450.
The second analog / digital converting unit 420 is connected to the sub microphone 230 and the noise canceling unit 440, and has a function of converting an analog electric signal sent from the sub microphone into a digital signal and sending the digital signal to the noise canceling unit 440.

The digital-analog conversion unit 430 is connected to the communication LSI 261 and the receiver 220, converts the demodulated call signal sent from the communication LSI 261 into an analog electrical signal that can be used by the receiver 220, and receives the receiver. The function to send to 220 is provided.
The noise canceling unit 440 receives the signal sent from the first analog-digital converting unit 410 (that is, the signal obtained by converting the output signal of the microphone 210 into a digital signal: hereinafter referred to as “microphone audio signal”). 2 A signal having a phase opposite to that of the signal sent from the analog-digital converter 420 (that is, a signal obtained by converting the output signal of the sub microphone 230 into a digital signal) is mixed to generate a noise reduction signal, and the generated noise reduction signal Is sent to the selection unit 450.

Here, in the case where the microphone 210 collects the voice of the user and the sound of the external environment, when the sub microphone 230 collects the sound of the external environment, the noise reduction signal is obtained from the microphone sound signal. The sound component of the external environment included in the sound signal is suppressed.
The handle information holding unit 470 is connected to the inclination determination unit 460 and has a function of storing handle information. Here, the handle information is information indicating whether the user using the mobile phone 100 uses the right hand or the left hand when using the mobile phone 100 to make a call. When the user operates the touch panel 130 according to a predetermined procedure, the information is stored in the handle information holding unit 470 (functional blocks for performing processing related to storing the handle information are not shown in FIG. 4). In addition, the handle information holding unit 470 stores handle information indicating the right hand as an initial value in the initial state.

  The tilt range information holding unit 480 is connected to the tilt determination unit 460 and has a function of storing right hand tilt range information and left hand tilt range information. Here, the right hand tilt range information is information indicating the tilt range of the mobile phone 100 according to whether or not the noise canceling process is performed when the user using the mobile phone 100 talks with the mobile phone 100 with the right hand. The left-hand tilt range information is information indicating a tilt range of the mobile phone 100 according to whether or not noise cancellation processing is performed when a user using the mobile phone 100 makes a call with the mobile phone 100 with the left hand. In addition, the inclination of the mobile phone 100 refers to an angle formed by a vertical direction and a vector having the center point of the receiver hole 120 as a base point and the center point of the microphone hole 110 as an end point. The right hand tilt range information and the left hand tilt range information are stored in advance in the tilt range information holding unit 480.

Hereinafter, the range of the tilt of the mobile phone 100 indicated by the right hand tilt range information and the left hand tilt range information will be described with reference to the drawings.
First, directions of three axes (X axis, Y axis, Z axis) orthogonal to each other in the mobile phone 100 will be described.
FIG. 5 is a perspective view of the mobile phone 100 in which the directions of the three axes (X axis, Y axis, Z axis) in the mobile phone 100 are shown.

  As shown in the figure, the X axis is an axis parallel to the short side of the front main plane of the mobile phone 100, and the left direction in FIG. 5 is a positive direction. The Z axis is an axis parallel to the long side of the front main plane of the mobile phone 100, and the lower direction in FIG. 5 is a positive direction. Further, the Y axis is an axis orthogonal to the front main plane of the mobile phone 100, and the back side direction in FIG.

  Here, the direction of the vector having the center point of the receiver hole 120 as the base point and the center point of the microphone hole 110 as the end point coincides with the positive direction of the Z axis. Then, the positive directions of the X axis, the Y axis, and the Z axis in the acceleration sensor 240 and the positive directions of the X axis, the Y axis, and the Z axis in the mobile phone 100 coincide with each other. The acceleration sensor 240 is fixed to the casing of the mobile phone 100.

In FIG. 6, when a user talks with the mobile phone 100 with the right hand, the mobile phone 100 is projected onto a plane orthogonal to the Y axis of the mobile phone 100 (hereinafter referred to as “Y-axis orthogonal plane”). It is a schematic diagram which shows a projected image typically.
As shown in the projection images a to e of the mobile phone 100 in the figure, it is assumed that the mobile phone 100 is tilted at various angles by a user and used for a call. The projected image a indicates a projected image of the mobile phone 100 in a state where the angle between the Z-axis projected axis of the mobile phone 100 and the vertical direction is 135 degrees, and the projected image b indicates the Z-axis of the mobile phone 100. The projection image of the mobile phone 100 in a state where the angle between the projection axis and the vertical direction is 90 degrees is shown, and the projection image c is a state where the angle between the projection axis of the Z axis of the mobile phone 100 and the vertical direction is 45 degrees. The projected image d shows a projected image of the mobile phone 100 in a state where the Z-axis projected axis and the vertical direction of the mobile phone 100 coincide with each other, and the projected image e shows the projected image e. The projection image of the mobile phone 100 in a state where the angle between the Z-axis projection axis and the vertical direction is −45 degrees is shown. Here, the angle between the Z-axis projection axis of the mobile phone 100 and the vertical direction is such that the direction of the user's face in the front direction is positive.

  When the mobile phone 100 is tilted in the range of b to d and used for a call, the distance from the user's mouth to the microphone hole 110 is larger than the distance from the user's mouth to the sub microphone hole 140. ing. Therefore, in this case, it is considered that the voice intensity of the user's voice input from the microphone hole 110 is higher than the voice intensity of the user's voice input from the sub microphone hole 140.

  Conversely, when the mobile phone 100 is tilted to the position a or e and used for a call, the distance from the user's mouth to the microphone hole 110 is greater than the distance from the user's mouth to the sub microphone hole 140. But it is not necessarily large. Therefore, in this case, it is considered that the voice intensity of the user's voice input from the microphone hole 110 is not necessarily higher than the voice intensity of the user's voice input from the sub microphone hole 140.

  The right-hand tilt range information is the voice strength input from the microphone hole 110 and the voice strength input from the sub microphone hole 140 for the user's voice when the mobile phone 100 is supported by the user's right hand and used for a call. This is information indicating a state in which the mobile phone 100 is tilted within a range of b to d in FIG. Specifically, it is information indicating a range in which the value of the X-axis component is 0 or less and the value of the Z-axis component is 0 or more in the vertical direction indicated by the acceleration sensor 240.

  Similarly, the left hand tilt range information is input from the microphone hole 110 and the voice strength is input from the sub microphone hole 140 for the user's voice when the mobile phone 100 is supported by the user's left hand and used for a call. This is information indicating a range that is greater than the voice intensity. Specifically, it is information indicating a range in which the value of the X-axis component is 0 or more and the value of the Z-axis component is 0 or more in the vertical direction indicated by the acceleration sensor 240.

Returning to FIG. 4 again, the description of the noise reduction function block 400 will be continued.
The inclination determination unit 460 is connected to the acceleration sensor 240, the handle information holding unit 470, the inclination range information holding unit 480, and the selection unit 450, and has the following two functions.
Inclination information acquisition function: A function of acquiring inclination information sent from the acceleration sensor 240.
Inclination determination function: With reference to (1) the possession information stored in the possession information holding unit 470 and the right-hand inclination range information or left-hand inclination range information stored in the inclination range information holding unit 480. When the hand information is information indicating the right hand, when the vertical direction indicated by the acquired inclination information is within the range indicated by the referenced right hand inclination range information, and (2) the referenced handle information is In the case of the information indicating the left hand, when the vertical direction indicated by the acquired inclination information is within the range indicated by the referenced left hand inclination range information, the selection unit 450 has the inclination of the mobile phone 100. A function to send an inclination determination signal indicating that the position is within a predetermined range.

  The selection unit 450 is connected to the proximity sensor 250, the inclination determination unit 460, the first analog-digital conversion unit 410, the noise cancellation unit 440, and the communication LSI 261. (1) An inclination determination signal is transmitted from the inclination determination unit 460. When the proximity signal is sent from the proximity sensor 250, the noise reduction signal sent from the noise canceling unit 440 is selected and sent to the communication LSI 261 as a call signal. (2) From the inclination determining unit 460 When the tilt determination signal is not sent, or when the proximity signal is not sent from the proximity sensor 250, the digital signal sent from the first analog-digital conversion unit 410 is selected to be used as a call signal to the communication LSI 261. Has a function to output.

Hereinafter, operations performed by the mobile phone 100 having the above-described configuration will be described with reference to the drawings.
<Operation>
Here, the selection process, which is a characteristic operation among the operations performed by the mobile phone 100, will be described.

<Selection process>
The selection process is a process performed by the mobile phone 100 in a call state, and is based on the vertical direction detected by the acceleration sensor 240 and the presence / absence of proximity of the human head or the like detected by the proximity sensor 250. Is a process of selecting either a noise reduction signal sent from the noise canceling unit 440 or a digital signal sent from the first analog-digital conversion unit 410 as a call signal to be sent to the communication LSI 261. This selection process is realized by the CPU 263 executing a program stored in the memory 262 to control the acceleration sensor 240, the proximity sensor 250, the communication LSI 261, the peripheral IC 264, and the touch panel controller 265.

FIG. 7 is a flowchart of the selection process.
The selection process is started when the mobile phone 100 enters a call state with an external mobile phone or the like.
When the selection process is started, the inclination determination unit 460 checks whether or not the handle information held by the handle information holding unit 470 indicates the right hand (step S700).

  In the process of step S700, when the handle information indicates the right hand (step S700: Yes), the tilt determination unit 460 refers to the right hand tilt range information held by the tilt range information holding unit 480 from the acceleration sensor 240. It is checked whether or not the vertical direction indicated by the transmitted tilt information is within the range indicated by the right-hand tilt range information. That is, it is checked whether the value of the X-axis component in the vertical direction indicated by the tilt information is 0 or less and the value of the Z-axis component is 0 or more (step S710).

  In the process of step S700, when the handle information does not indicate the right hand, that is, when the handle information indicates the left hand (step S700: No), the tilt determination unit 460 displays the left hand tilt range information held by the tilt range information holding unit 480. With reference to this, it is checked whether or not the vertical direction indicated by the inclination information sent from the acceleration sensor 240 is within the range indicated by the left inclination range information. That is, it is checked whether the value of the X-axis component in the vertical direction indicated by the tilt information is 0 or more and the value of the Z-axis component is 0 or more (step S720).

  In the process of step S710, when the value of the X-axis component in the vertical direction indicated by the tilt information is 0 or less and the value of the Z-axis component is 0 or more (step S710: Yes), or the process of step S720 When the value of the X-axis component in the vertical direction indicated by the tilt information is 0 or more and the value of the Z-axis component is 0 or more (step S720: Yes), the tilt determination unit 460 determines the tilt determination signal. Is output to the selection unit 450 (step S730).

When the tilt determination unit 460 outputs the tilt determination signal to the selection unit 450, the selection unit 450 checks whether proximity information is sent from the proximity sensor 250 (step S740).
When proximity information is sent from the proximity sensor 250 in the process of step S740 (step S740: Yes), the selection unit 450 reduces noise transmitted from the noise cancellation unit 440 as a call signal to be sent to the communication LSI 261. A signal is selected (step S750).

  In the process of step S710, when the value of the X-axis component in the vertical direction indicated by the tilt information is not 0 or less, or the value of the Z-axis component is not 0 or more (step S710: No), or in the process of step S720, If the value of the X-axis component in the vertical direction indicated by the tilt information is not 0 or more, or the value of the Z-axis component is not 0 or more (step S720: No), the tilt determination unit 460 selects the tilt determination signal as the selection unit 450. (Step S760).

When the process of step S760 is completed, or when proximity information is not sent from the proximity sensor 250 in the process of step S740 (step S740: No), the selection unit 450 sends a call signal to the communication LSI 261. The digital signal sent from the first analog-digital conversion unit 410 is selected (step S770).
When the process of step S760 ends, or when the process of step S770 ends, the selection unit 450 checks whether the mobile phone 100 is currently in a call state (step S780).

In the process of step S780, when the mobile phone 100 is currently in a call state (step S780: Yes), the mobile phone 100 repeats the processes after step S700.
In the process of step S780, when the mobile phone 100 is not currently in a call state (step S780: No), the mobile phone 100 ends the selection process.

<Discussion>
In the mobile phone 100 configured as described above, when the user makes a call with the mobile phone 100 by hand, the inclination of the mobile phone 100 is such that the voice intensity of the user's voice input from the microphone hole 110 is greater than the sub microphone hole 140. The noise canceling process is performed when the sound intensity is within a range assumed to be higher than the voice strength of the user's voice input from the mobile phone 100, and the voice of the user's voice input from the microphone hole 110 is performed by the inclination of the mobile phone 100. When the intensity is not within the range assumed to be greater than the voice intensity of the user's voice input from the sub microphone hole 140, the noise canceling process is not performed. This makes it difficult for a significant reduction in the voice component of the user's voice due to the noise cancellation process.
<Embodiment 2>
<Overview>
Hereinafter, as an example of the mobile communication terminal according to the present invention, a modified mobile phone obtained by modifying a part of the mobile phone 100 according to Embodiment 1 will be described.

The modified mobile phone according to the second embodiment has the same hardware configuration as that of the mobile phone 100 according to the first embodiment, but a part of the executed software and the storage Part of the data to be processed is modified from the mobile phone 100 according to the first embodiment.
Similar to the mobile phone 100 according to the first embodiment, the modified mobile phone according to the second embodiment executes the noise canceling process only when a predetermined condition is satisfied in the call state. However, this modified mobile phone is an example of a configuration in which a predetermined condition for determining whether or not to perform noise cancellation processing is different from that of mobile phone 100 according to the first embodiment.

Hereinafter, a modified mobile phone according to the second embodiment will be described with reference to the drawings, focusing on differences from the mobile phone 100 according to the first embodiment.
<Configuration>
The modified mobile phone has the same hardware configuration as mobile phone 100 according to Embodiment 1. Therefore, the description is omitted here.

In the following description, the description of each component constituting the hardware of the modified mobile phone will be made using the same reference numerals as those used in the description of the first embodiment.
Part of the program executed by CPU 263 in the modified mobile phone is modified from the program executed by CPU 263 in mobile phone 100 according to Embodiment 1. For this reason, the noise reduction functional block 400 according to the first embodiment is transformed into a modified noise reduction functional block 800.

FIG. 8 is a block diagram showing a functional configuration of the deformation noise reduction functional block 800. The deformation noise reduction functional block 800 is realized by the CPU 263 executing a program stored in the memory 262.
As shown in the figure, in the modified noise reduction functional block 800, the selection unit 450 is changed to the deformation selection unit 850 from the noise reduction functional block 400 according to the first embodiment, and the inclination determination unit 460 is changed into the deformation inclination determination unit. 860 is changed, the tilt range information holding unit 480 is changed to the modified tilt range information holding unit 880, and the handle information holding unit 470 is deleted.

  The modified inclination range information holding unit 880 is partly modified from the inclination range information holding unit 480 according to Embodiment 1, and is connected to the modified inclination determination unit 860 and stores the inclination range information. Have Here, the tilt range information is information indicating a tilt range of the modified mobile phone according to whether or not the noise canceling process is performed when a user who uses the modified mobile phone makes a call while holding the modified mobile phone. The tilt range information is information that is not affected by whether the handle of the modified mobile phone is the right hand or the left hand, and is stored in the deformed tilt range information holding unit 880 in advance.

Hereinafter, the range of the tilt of the modified mobile phone indicated by the tilt range information will be described with reference to the drawings.
In FIG. 9, when a user makes a call with a modified mobile phone with the right hand, the modified mobile phone is projected onto a plane orthogonal to the X axis of the modified mobile phone (hereinafter referred to as “X-axis orthogonal plane”). It is a schematic diagram which shows a projected image typically. The contents described below are the same even if the hand of the modified mobile phone is the left hand, so here, the case where the hand is the right hand will be described. As shown in the projection images k to n of the modified mobile phone in FIG. 9, it is assumed that the modified mobile phone is tilted at various angles by the user and used for a call. The projected image k indicates a projected image of the modified mobile phone in a state where the angle between the Z-axis projected axis of the modified mobile phone and the vertical direction is 90 degrees, and the projected image l indicates the Z-axis of the modified mobile phone. The projected image of the modified mobile phone in a state where the angle between the projection axis and the vertical direction is 30 degrees is shown, and the projected image m is a modified mobile phone in a state where the projected image of the Z-axis of the modified mobile phone matches the vertical direction. The projected image n is a projected image of the modified mobile phone in a state where the angle between the Z-axis projected axis of the modified mobile phone and the vertical direction is −10 degrees. Here, the angle between the Z-axis projection axis of the mobile phone 100 and the vertical direction is positive in the direction away from the user's face.

  When the modified mobile phone is tilted in the range of 1 to n and used for a call, the distance from the user's mouth to the microphone hole 110 is larger than the distance from the user's mouth to the sub microphone hole 140. ing. Therefore, in this case, it is considered that the voice intensity of the user's voice input from the microphone hole 110 is higher than the voice intensity of the user's voice input from the sub microphone hole 140.

  Conversely, when the modified mobile phone is tilted to the position k and used for a call, the distance from the user's mouth to the microphone hole 110 is not necessarily the distance from the user's mouth to the sub microphone hole 140. It doesn't grow. Therefore, in this case, it is considered that the voice intensity of the user's voice input from the microphone hole 110 is not necessarily higher than the voice intensity of the user's voice input from the sub microphone hole 140.

  The inclination range information indicates that the voice strength of the user's voice when the modified mobile phone is supported by the user's hand and used for a call is input from the microphone hole 110 than the voice intensity input from the sub microphone hole 140. If the handle is a right hand, this is information indicating a state in which the modified mobile phone is tilted to a range of 1 to n in FIG. Specifically, in the vertical direction indicated by the acceleration sensor 240, the value of the Y-axis component is SIN (−10 °) or more and SIN (30 °) or less, and the value of the Z-axis component is 0 or more. Information indicating a range. Here, it is assumed that the vertical X-axis component, Y-axis component, and Z-axis component indicated by the acceleration sensor 240 are normalized so that the maximum value of each absolute value is 1.

Returning to FIG. 8 again, the description of the modified noise reduction functional block 800 will be continued.
The deformation inclination determination unit 860 is partly modified from the inclination determination unit 460 according to Embodiment 1, and is connected to the acceleration sensor 240, the deformation inclination range information holding unit 880, and the deformation selection unit 850. In addition to the inclination information acquisition function of the inclination determination unit 460 according to the first embodiment, the following modified inclination determination function is provided.

Deformation tilt determination function: When the vertical direction indicated by the acquired inclination information is within the range indicated by the referenced inclination range information with reference to the inclination range information stored in the deformation inclination range information holding unit 880 And a function of sending a deformation inclination determination signal to the deformation selection section 850 to the effect that the inclination of the deformation mobile phone is within a predetermined range.
The deformation selection unit 850 is partly modified from the selection unit 450 according to the first embodiment, and includes a proximity sensor 250, a deformation inclination determination unit 860, a first analog / digital conversion unit 410, and a noise cancellation unit 440. Are connected to the communication LSI 261, and (1) when a deformation inclination determination signal is transmitted from the deformation inclination determination section 860, when a proximity signal is transmitted from the proximity sensor 250, it is transmitted from the noise cancellation section 440. The noise reduction signal is selected and sent to the communication LSI 261 as a call signal. (2) When the deformation inclination determination signal is not transmitted from the deformation inclination determination unit 860, or the proximity signal is transmitted from the proximity sensor 250. If not, the digital signal sent from the first analog-digital converter 410 is selected and the communication LSI is selected as a call signal. It has a function to output to 61.

The operation performed by the modified mobile phone having the above configuration will be described below with reference to the drawings.
<Operation>
Here, the deformation selection process, which is a characteristic operation among the operations performed by the modified mobile phone, will be described.
<Deformation selection process>
The deformation selection process is a process performed by the deformed mobile phone that is in a call state, and depends on the vertical direction detected by the acceleration sensor 240 and the presence or absence of proximity of the human head or the like detected by the proximity sensor 250. 450 is a process of selecting one of the noise reduction signal sent from the noise cancellation unit 440 and the digital signal sent from the first analog-digital conversion unit 410 as a call signal to be sent to the communication LSI 261.

FIG. 10 is a flowchart of the deformation selection process.
The modification selection process is a process in which a part of the selection process (see FIG. 7) according to the first embodiment is modified. The process from step S1030 to the process from step S1070 in the deformation selection process is the same as the process from step S730 to the process from step S770 in the selection process according to Embodiment 1, respectively. Therefore, here, the processing in step S1000 and the processing in step S1080 will be mainly described.

The modification selection process is started when the modified mobile phone enters a call state with an external mobile phone or the like.
When the deformation selection process is started, the deformation inclination determination unit 860 refers to the inclination range information held by the deformation inclination range information holding unit 880 and determines the vertical direction indicated by the inclination information sent from the acceleration sensor 240. Then, it is checked whether or not it is within the range indicated by the inclination range information. That is, it is checked whether the value of the Y-axis component in the vertical direction indicated by the tilt information is SIN (−10 °) or more and SIN (30 °) or less and the value of the Z-axis component is 0 or more (step) S1000).

  In the process of step S1000, when the value of the Y-axis component in the vertical direction indicated by the tilt information is not less than SIN (−10 °) and not more than SIN (30 °) and the value of the Z-axis component is not less than 0 ( In step S1000: Yes), the modified mobile phone performs the processing of step S1030 and subsequent steps. In the process of step S1000, when the value of the Y-axis component in the vertical direction indicated by the tilt information is not SIN (−10 °) or more and SIN (30 °) or less, or the value of the Z-axis component is not 0 or more ( In step S1000: No), the modified mobile phone performs the processing of step S1040 and subsequent steps.

When the process of step S1060 ends, or when the process of step S1070 ends, the deformation selection unit 850 checks whether the deformed mobile phone is currently in a call state (step S1080).
In the process of step S1080, when the modified mobile phone is currently in a call state (step S1080: Yes), the modified mobile phone repeats the processes in and after step S1000.

In the process of step S1080, when the modified mobile phone is not currently in a call state (step S1080: No), the modified mobile phone ends the modified selection process.
<Supplement>
As described above, the mobile phone 100 and the modified mobile phone have been described as examples of the mobile communication terminal according to the present invention in the first and second embodiments. However, the following modifications may be made. Of course, the present invention is not limited to the portable communication terminal according to the above-described embodiment.

  (1) In the first embodiment, the mobile phone 100 includes the proximity sensor 250 and the acceleration sensor 240, and the proximity sensor 250 is such that the head of the user who uses the terminal and the terminal are close to each other. When the acceleration sensor 240 detects that the inclination of the own terminal with respect to the vertical direction is within a predetermined range, the noise cancellation processing is performed. .

  However, the cellular phone 100 does not include the proximity sensor 250 and performs noise cancellation processing only when the acceleration sensor 240 detects that the inclination of the terminal with respect to the vertical direction is within a predetermined range. An example of a configuration of performing is also conceivable. In general, it is considered that a user who uses a mobile phone makes a call with the receiver hole of the mobile phone placed close to the ear. This is because it is assumed that the telephone and the user's head are close to each other.

(2) In the first embodiment, the mobile phone 100 is an example of a configuration that is a so-called smartphone-type mobile phone including a substantially rectangular parallelepiped housing, but the inclination of the own terminal with respect to the vertical direction is within a predetermined range. If it is the structure which can detect that it is, it will not necessarily be restricted to the structure which is what is called a smart phone type | mold mobile phone provided with the substantially rectangular parallelepiped housing | casing.
As an example, a mobile phone 1100 shown below can be considered.

FIG. 11 is a perspective view of the mobile phone 1100.
As shown in the figure, a mobile phone 1100 is a so-called foldable mobile phone in which a first housing 1130 having a microphone hole 1110 and a second housing 1140 having a receiver hole 1120 are connected in an openable and closable manner. It is a telephone.
(3) In the first embodiment, the cellular phone 100 indicates that the range of the inclination of the cellular phone 100 according to whether or not the noise cancellation processing is performed is (a) when the user uses the right hand, the acceleration sensor 240 indicates In the vertical direction, the X-axis component value is 0 or less and the Z-axis component value is 0 or more. (B) When the user uses the left hand, the acceleration sensor 240 is In the vertical direction shown, the X-axis component value is 0 or more and the Z-axis component value is 0 or more. In the second embodiment, the modified cellular phone has a Y-axis component value of SIN (−10) in the vertical direction indicated by the acceleration sensor 240 in the range of inclination of the modified cellular phone according to the presence or absence of the noise cancellation process. This is an example of a configuration in which the angle is SIN (30 °) or less and the value of the Z-axis component is 0 or more.

However, as long as the sound intensity input from the microphone hole 110 is larger than the sound intensity input from the sub microphone hole 140, the range of the inclination of the mobile phone 100 in the first embodiment is not necessarily limited. The range of the tilt of the modified mobile phone according to the second embodiment is not necessarily limited.
As an example, when the mobile phone tilt range is (c) when the user uses the right hand, the value of the X-axis component is 0 or less and the Z-axis component in the vertical direction indicated by the acceleration sensor 240 Is a range in which the value of the Y-axis component is SIN (−10 °) or more and SIN (30 °) or less and (d) when the user uses the left hand, the acceleration In the vertical direction indicated by the sensor 240, the value of the X-axis component is 0 or more, the value of the Z-axis component is 0 or more, and the value of the Y-axis component is SIN (−10 °) or more. An example of a configuration having a range of SIN (30 °) or less is conceivable.

  (4) In the first embodiment, the example of the configuration in which the acceleration sensor 240 is a so-called three-axis acceleration sensor that can detect axial components of three axes orthogonal to each other has been described. However, if it is possible to detect whether the vertical direction to be measured is the range of the tilt indicated by the right-hand tilt range information and the left-hand tilt range information stored by the tilt range information holding unit 480, they are not necessarily orthogonal to each other. The configuration is not limited to an acceleration sensor that can detect the axial components of each of the three axes. For example, there can be a configuration that is an acceleration sensor that can detect the axial components of two axes that are orthogonal to each other. There may be a configuration that is an acceleration sensor that can detect a component of only one axis, or a configuration that is an acceleration sensor that can detect three axis components that are not orthogonal to each other.

  (5) In the first embodiment, the mobile phone 100 is an example of a configuration in which the sub microphone hole 140 is disposed at a position facing the receiver hole 120 on the back main surface of the housing. However, when the user who uses the mobile phone 100 is talking with the ear and the mouth close to the receiver hole 120 and the microphone hole 110 respectively, the distance from the mouth to the microphone hole 110 is more from the mouth. If the sub microphone hole 140 is arranged at a position shorter than the distance to the sub microphone hole 140, the arrangement position of the sub microphone hole 140 is not necessarily the position facing the receiver hole 120 on the back main surface of the housing. There is no. As an example, the structure etc. which are arrange | positioned near the center of the housing | casing side surface can be considered.

  (6) In the first embodiment, the proximity sensor 250 is composed of a capacitive proximity sensor of a type that detects the proximity of a detection body by capturing a change in electrical capacitance. As long as the proximity of a part can be detected, the configuration is not necessarily limited to a capacitive proximity sensor. As an example, an example of an infrared distance measuring sensor using infrared rays can be considered.

  (7) In the first embodiment, in the mobile phone 100, the direction of the vector having the center point of the receiver hole 120 as the base point and the center point of the microphone hole 110 as the end point coincides with the positive direction of the Z axis of the mobile phone 100 It was an example of a configuration to do. However, the tilt range of the mobile phone 100 indicated by the right-hand tilt range information and the tilt range of the mobile phone 100 indicated by the left-hand tilt range information stored in the tilt range information holding unit 480 are input from the microphone hole 110. If the sound intensity indicates a range in which the sound intensity input from the sub microphone hole 140 is larger than the sound intensity input from the sub microphone hole 140, the vector of the vector having the center point of the receiver hole 120 as a base point and the center point of the microphone hole 110 as an end point is not necessarily obtained. It is not necessary that the orientation matches the positive orientation of the Z axis of the mobile phone 100. As an example, the direction of the vector having the center point of the receiver hole 120 as a base point and the center point of the microphone hole 110 as an end point is 10 degrees in the positive direction of the X axis with respect to the positive direction of the Z axis of the mobile phone 100. An example of an inclined configuration is conceivable.

  (8) In the first embodiment, the mobile phone 100 includes the X-axis, Y-axis, and Z-axis positive orientations of the acceleration sensor 240 and the X-axis, Y-axis, and Z-axis of the mobile phone 100, respectively. The acceleration sensor 240 is an example of a configuration in which the acceleration sensor 240 is fixed to the casing of the mobile phone 100 so that the positive orientations coincide with each other. However, if the mobile phone 100 can detect the inclination of the terminal with respect to the vertical direction, the X-axis, Y-axis, and Z-axis positive orientations of the acceleration sensor 240 and the X The positive directions of the axis, the Y axis, and the Z axis are not limited to the same configuration. As an example, the positive directions of the X axis, the Y axis, and the Z axis in the acceleration sensor 240 and the positive directions of the X axis, the Y axis, and the Z axis in the mobile phone 100 do not match each other. The acceleration sensor 240 is fixed to the casing of the mobile phone 100 at a predetermined angle, and the inclination determination unit 460 outputs the value of the X-axis component in the acceleration sensor 240 output from the acceleration sensor 240. From the inclination information composed of the value of the Y-axis component and the value of the Z-axis component, a deformation composed of the value of the X-axis component, the value of the Y-axis component, and the value of the Z-axis component in the mobile phone 100 An example of a configuration having an inclination information conversion function for converting into inclination information is conceivable.

(9) In the embodiment, an example in which the mobile communication terminal is a mobile phone has been described. However, the mobile terminal is not necessarily limited to a mobile phone as long as the mobile terminal has a call function. It may be a PDA (Personal Digital Assistant: portable information terminal), a transceiver, or the like.
(10) The above embodiment and the above modifications may be combined.

(11) Hereinafter, the configuration of the mobile communication terminal according to the embodiment of the present invention, its modification, and each effect will be described.
(A) A mobile communication terminal according to an embodiment of the present invention is a mobile communication terminal that transmits a call signal based on an output signal of a built-in microphone to an external communication device, and is disposed apart from the microphone. Based on the sub microphone, the output signal of the microphone, and the output signal of the sub microphone, a noise reduction unit that generates a noise reduction signal in which a noise component included in the signal is reduced from the output signal of the microphone, An inclination measurement unit that measures the inclination of the terminal; and the output signal of the microphone and the output signal of the microphone so that the output signal of the microphone is selected when the inclination measured by the inclination measurement unit is not within a predetermined range. A selection unit that selectively selects a noise reduction signal generated by the noise reduction unit; and a signal selected by the selection unit is transmitted to the external communication device. And a sending unit.

  In the mobile communication terminal according to the present embodiment having the above-described configuration, the volume level for the user's voice input from the microphone is larger than the volume level for the user's voice input from the sub microphone. By setting the range to be large enough not to be significantly reduced by the noise reduction means, it is less likely to cause a significant reduction in the voice component of the user's voice by the noise reduction means than before. Can do.

(B) In addition, a proximity detection unit that detects that the head of the user using the own terminal and the own terminal are close to each other, the selection unit further includes the selection in the alternative selection, The output signal of the microphone may be selected even when the detection is not performed by the proximity detection unit.
As a result, the mobile communication terminal can prevent a significant reduction in the voice component of the user's voice by the noise reduction means when the user is talking without bringing the mobile communication terminal close to the head. .

  (C) a receiving unit that receives a communication signal transmitted from an external communication device; and a receiver that outputs sound based on the communication signal received by the receiving unit to the outside. In a state where the user using the terminal brings the receiver close to the ear, the distance between the user's mouth and the microphone is included in a range that is shorter than the distance between the user's mouth and the sub microphone. It is good.

As a result, when the user talks with the receiver close to his / her ear, the voice of the user by the noise reduction means is within a range in which the distance between the user's mouth and the microphone is not shorter than the distance between the user's mouth and the sub microphone. It is possible to prevent a significant reduction in the sound component.
(D) In addition, the receiver includes a receiving unit that receives a communication signal transmitted from an external communication device, and a receiver that outputs the sound based on the communication signal received by the receiving unit to the outside. The angle component in the forward direction of the user's face in a state where the user using his / her terminal makes the receiver close to his / her ear at the inclination between the microphone and the vertical direction with respect to the receiver as a base point is 0 degree or more and 90 degrees The range may be as follows.

As a result, the mobile communication terminal allows the user's voice to be reduced by the noise reduction means in a range other than the range of 0 degrees or more and 90 degrees or less in front of the user's face when the user is talking with the receiver close to the ear. It is possible to prevent a significant reduction in audio components.
(E) In addition, the receiver includes a receiving unit that receives a communication signal transmitted from an external communication device, and a receiver that outputs sound based on the communication signal received by the receiving unit to the outside. An angle component in a direction in which the user using the terminal moves away from the side surface of the user's face in a state in which the user uses his / her terminal close to his / her ear with respect to the inclination of the microphone and the vertical direction with respect to the receiver as a base point is −10 degrees. The range may be 30 degrees or less.

  As a result, the mobile communication terminal allows the voice of the user by the noise reduction means in a range other than the range of −10 degrees to 30 degrees to the side of the user's face in a state where the user makes a call with the receiver close to the ear. It is possible to prevent a significant reduction in the sound component.

  The present invention can be widely used for portable communication terminals.

100 Mobile phone 110 Microphone hole 120 Receiver hole 130 Touch panel 140 Sub microphone hole 210 Microphone 220 Receiver 230 Sub microphone 240 Acceleration sensor 250 Proximity sensor 261 Communication LSI
262 Memory 263 CPU
H.264 peripheral IC
270 touchpad 280 liquid crystal display 320 antenna

Claims (5)

A portable communication terminal that transmits a call signal based on an output signal of a built-in microphone to an external communication device,
A sub microphone arranged to be separated from the microphone;
Based on the output signal of the microphone and the output signal of the sub microphone, a noise reduction unit that generates a noise reduction signal in which a noise component included in the signal is reduced from the output signal of the microphone,
An inclination measuring unit that measures the inclination of the terminal with respect to the vertical direction;
An output signal of the microphone and a noise reduction signal generated by the noise reduction unit so that the output signal of the microphone is selected when the inclination measured by the inclination measurement unit is not within a predetermined range; A selection section for selecting alternatively,
A transmission unit that transmits the signal selected by the selection unit to the external communication device ;
A proximity detector that detects the proximity of the human body and the terminal;
A receiving unit for receiving a communication signal transmitted from an external communication device;
A receiver that outputs sound based on a communication signal received by the receiving unit to the outside ;
The predetermined range is provided with a receiver hole that emits sound from the receiver on the surface of the terminal with respect to the vertical direction, with the receiver as a base point, in a state where the proximity detection unit detects the proximity. A mobile communication terminal characterized by being expressed by an angle component in a direction in which the formed surface leaves . Prior Symbol selection unit, in the alternative selected, further, according to claim 1, wherein even when the by the proximity detector to detect not made and performs so as to select the output signal of the microphone Mobile communication terminals. A receiving unit for receiving a communication signal transmitted from an external communication device;
A receiver that outputs sound based on a communication signal received by the receiving unit to the outside;
The predetermined range is such that a distance between the user's mouth and the microphone is shorter than a distance between the user's mouth and the sub microphone in a state where the user using the terminal brings the receiver close to the ear. The mobile communication terminal according to claim 1 , wherein the mobile communication terminal is included in a range. A handle information holding unit for storing handle information is further provided.
The mobile communication terminal according to claim 1, wherein the mobile communication terminal is a mobile communication terminal. It further comprises a three-axis acceleration sensor orthogonal to each other,
The tilt measurement unit measures the tilt based on tilt information from the acceleration sensor.
The mobile communication terminal according to claim 1, wherein the mobile communication terminal is a mobile communication terminal.

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