JP2008135991A - Portable telephone and sound output control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable telephone for enabling a user to perform comfortable speech communication by enabling the user to check a voice spoken by the user himself/herself with a volume balance so as to make the user easily listen to the voice even though the user uses a bone conduction speaker while closing an ear, and to provide a sound output control method. <P>SOLUTION: The portable telephone is provided with: a bone conduction speaker part 106; a microphone part 104; a communicating part 107 connected to a communication network to transmit and receive voices during speech communication; a high-pitched sound amplifying part 102 for amplifying a high-pitched sound side of an input sound signal based on a voice inputted to the microphone part 104; and a control part 101 for controlling the high-pitched sound side of the input sound signal based on the voice inputted to the microphone part 104 so as to output the sound signal amplified by the high-pitched sound amplifying part 102 to the bone conduction speaker part 106. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mobile phone.

  Currently, a speaker called a bone conduction speaker is known. A bone conduction speaker is a speaker that contacts a user's body and transmits sound to the cochlea of the auditory organ using the user's human bone as a medium.

  Such bone conduction speakers are used as telephone reception speakers for people with weak hearing such as elderly people.

  By the way, the method of using such a bone conduction speaker has been reviewed at present, and it uses the characteristic that air conduction sound using air as a medium and bone conduction sound do not mix, and it can be heard as a speaker that can be heard clearly even under noise. It is also being used for things other than those for weak people. For example, as shown in Patent Document 1, it is increasingly mounted on a mobile phone that is often used under noise.

In addition to the bone conduction speaker technique described above, there is a technique called a side tone. Side tone refers to a technology that slightly outputs the sound input to the transmitter of the telephone from the receiver of the telephone, and the user's own voice can be input as a transmission, or the telephone It is often used to check whether it is operating normally. The side tone is mainly used as one of acoustic correction techniques in a device capable of transmitting and receiving, such as a telephone. Patent Document 2 discloses a technique in which sound quality is corrected in consideration of the shape of the housing in the acoustic correction apparatus using the side tone technique.
JP 2005-175746 A JP 2001-197585 A

  As described above, the bone conduction speaker may be used for a mobile phone in order to hear sound clearly under noise by utilizing the characteristic that the sound that conducts bone conduction and the sound that uses air as a medium do not mix.

  In general, a cellular phone equipped with a bone conduction speaker has two types of speakers, a bone conduction speaker and an audio speaker, as shown in Patent Document 1, and a user can talk using a normal speaker. When the user feels that the surroundings are noisy, the output is switched from a normal speaker to a bone conduction speaker by an operation by the user.

  By the way, when a user feels noisy ambient noise and switches to a bone conduction speaker, it is common for the user to try to talk while closing his / her ear to prevent noise from entering his / her ear. is there. At this time, since the user has closed his / her ear, the bass side of the user's own voice transmitted through the bone cannot escape to the outside of the ear. That is, when the bone conduction speaker is used while closing the ear as shown in FIG. 7 (a), the voice of the user's own voice is compared with the case where the bone conduction speaker is used without closing the ear as shown in FIG. 7 (b). There was a problem that the bass side was amplified and heard, and the balance of the voices that it produced became poor and it was difficult to confirm clearly.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a mobile phone capable of confirming a voice uttered by a user with a volume balance that is easy to hear even when a user uses a bone conduction speaker while closing his ears, and capable of making a comfortable call, and an audio output control method therefor Is to provide.

  In order to achieve the above object, in the present invention, a bone conduction speaker unit and a microphone unit, a communication unit connected to a communication network to transmit and receive audio, and a treble of an input audio signal based on the audio input to the microphone unit When a call is made via the communication unit and the high sound amplification unit that amplifies the side, the high sound side of the input sound signal based on the sound input to the microphone unit is amplified by the high sound amplification unit. And a control unit that controls to output to the bone conduction speaker unit.

  Further, in the present invention, further comprising an audio speaker unit, the control unit determines when to output the audio received by the communication unit as the bone conduction speaker unit and when to use the audio speaker unit, When the output destination of the audio received by the communication unit is the audio speaker unit, the input audio signal is output to the audio speaker unit without being amplified by the treble amplifier, or the input audio signal is It is preferable to control so as not to output to the audio speaker unit.

  Furthermore, in the present invention, it is preferable that the treble amplifying unit can change an amplification amount on the treble side of the input audio signal to be amplified.

  The treble amplifier may include a high-pass filter, and the controller may be capable of changing a reduction target threshold on the low-pitched side of the input audio signal by the high-pass filter.

  In the present invention, it is preferable that the control unit can change whether or not to perform treble amplification by the treble amplification unit using the operation unit.

  In order to achieve the above object, in the second aspect of the present invention, when a voice call is made, the input voice received by the communication unit is output from the bone conduction speaker unit or output from the voice speaker unit. A first step of determining whether or not to output the input sound from the bone conduction speaker unit according to the first step, a high sound side of the input sound signal based on the sound input to the microphone unit In the case where the input sound signal amplified at the high-frequency side is output to the bone conduction speaker unit and the input sound is output from the sound speaker unit by the first step, the sound input to the microphone unit A second step of not outputting the input audio signal to the audio speaker unit without amplifying the input audio signal based on the treble amplification unit, or not outputting the input audio signal to the audio speaker unit; Characterized in that it.

  According to the present invention, a mobile phone capable of confirming a voice uttered by a user with a volume balance that can be easily heard even when a user uses a bone conduction speaker while closing his ear, and capable of making a comfortable call, and a method for controlling the sound output thereof Can be provided.

Embodiments of a mobile phone according to the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a block diagram illustrating an example of the configuration of a mobile phone system according to the present invention. As shown in the figure, a mobile phone 100 includes a control unit 101, a high sound amplification unit 102, an audio processing unit 103, a microphone unit 104, an audio speaker unit 105, a bone conduction speaker unit 106, a communication unit 107, a key operation unit 108, and a memory unit. 109 and a display unit 110.

  The key operation unit 108 includes a plurality of input keys. For example, a plurality of input keys can be used to input an up / down key that can issue an instruction in the up / down direction, a left / right key that can issue an instruction in the left / right direction, a decision key that determines an item selected by the up / down key and the left / right key, and a telephone number. There are a numeric keypad and a call key (not shown) for invoking call time.

  The display unit 110 includes an LCD (Liquid Crystal Display), an organic EL (Organic Electroluminescence Display), and the like, and performs various displays in response to a drawing request signal from the control unit 101 described later.

  In addition to storing various programs executed by the control unit 101, the memory unit 109 stores various parameters (details will be described later) used in the treble amplification unit 102 and the audio processing unit 103, and addresses describing telephone numbers and the like. Stores books and the like.

  The communication unit 107 performs a wireless communication operation via the wireless base station under the control of the control unit 101 (for example, a call operation performed when a telephone number is input from the key operation unit 108) and a voice communication signal associated with the wireless communication operation Data transmission / reception and electronic data transmission / reception.

The voice processing unit 103 has a function of decoding voice communication signals transmitted and received from the communication unit 107 for the microphone unit 104, the voice speaker unit 105, and the bone conduction speaker unit 106 when a call is started via the communication unit 107. .
In addition, the voice processing unit 103 adjusts the volume of the microphone unit 104 that collects the voice uttered by the user when a call is started as described above, the voice speaker unit 105 that transmits the voice to the user, and the bone conduction speaker unit 106. I do. At this time, the volume value referred to by the audio processing unit 103 is stored in the memory unit 109.
Further, when the treble amplifying unit 102 (details will be described later) is used, the audio processing unit 103 sends an input audio signal input from the microphone unit 104 to the treble amplifying unit 102, and the treble amplifying unit 102 processes it. The input voice signal is received from the treble amplifier 102 and sent to the bone conduction speaker 106.

  The high sound amplification unit 102 is a block that functions under the control of the control unit 101 when a call is performed using the bone conduction speaker unit 106. As described above, among the input audio signals received from the audio processing unit 103, the volume of the high frequency band above the set frequency is amplified, and the input audio signal in which the high frequency band is amplified is re-sound. It has a function of sending to the processing unit 103.

  The bone conduction speaker unit 106 is a kind of speaker including a bone conduction vibrator and an actuator that generates vibration. The bone conduction speaker unit 106 vibrates the vibrator by a signal supplied from the audio processing unit 103 in a state where the bone conduction speaker unit 106 is in contact with a part of the skull of the user, and propagates the user's bone to thereby transmit the audio to the user. Is to communicate.

  The audio speaker unit 105 includes a diaphragm, a voice coil, and the like, and is a speaker that outputs sound by air vibration and is generally widely recognized as a speaker. Similar to the bone conduction speaker unit 106, a diaphragm or the like is vibrated by a signal supplied from the audio processing unit 103 to transmit audio to the user.

  The microphone unit 104 has a function of collecting the voice uttered by the user, converting the collected voice into an input voice signal, and sending the input voice signal to the voice processing unit 103.

  The control unit 101 is mainly composed of a microcomputer and controls the entire mobile phone 100. For example, the control unit 101 controls various communication operations in the communication unit 107, controls the drawing of the display unit 110, processes according to input information of the key operation unit 108, access control to the memory unit 109, and the audio processing unit 103. Performs transmission / reception and control of audio signals and various controls (details will be described later) for the treble amplifier 102.

  Next, the operation of the mobile phone 100 according to the embodiment of the present invention will be described with reference to FIGS. 2, 3, 4, 5, and 6. FIG. FIG. 2 is a flowchart showing the operation of the present invention.

  First, the other mobile phone and the communication unit 107 start transmission / reception of voice signals (that is, a call) via the wireless base station (S01). When the transmission / reception described above is started, the control unit 101 inquires of the memory unit 109 whether or not the high-pitched sound side correction setting is on (S02).

  If the treble correction setting is on (S02 / Yes), the control unit 101 further selects either the audio speaker unit 105 or the bone conduction speaker unit 106 as the output destination of the audio signal received by the communication unit 107. (S03).

  When the bone conduction speaker unit 106 is set as the output destination of the audio signal (S03 / Yes), the control unit 101 refers to the amplification unit for treble amplification and a threshold parameter (details will be described later) from the memory unit 109. Then, the parameter is transmitted to the treble amplifier 102 (S04). Next, the voice uttered by the user input from the microphone unit 104 is transmitted to the treble amplification unit 102 as an input audio signal via the audio processing unit 103. A process (details will be described later) for amplifying the treble side in accordance with the above-described amplification amount and threshold parameters for treble amplification is applied to the transmitted input audio signal in the treble amplification section 102 (S05). The sound is output from the bone conduction speaker unit 106 via the audio processing unit 103 (S06), and the user can confirm the sound he / she has made with his / her ear.

  Processing in the above-described steps S03 to S06 will be described with reference to FIG. 3A, 3B, and 3C show the frequency distribution of the volume from the low sound side to the high sound side of the input or output sound, with the horizontal axis representing the sound frequency and the vertical axis representing the sound volume. Here, in order to simplify the explanation, the rough increase / decrease distribution is shown linearly, but in reality, the graph of the audio frequency distribution is composed of a large number of small curves.

  FIG. 3A schematically shows how the sound volume of the sound produced by the user when the user closes his / her ear can be heard by the user. As described above with reference to FIG. 7, when the ear is closed (FIG. 7A), the high-pitched sound side is particularly compared to the case where the ear is closed without closing the ear (FIG. 7B). Although it does not change, the bass side does not come out of the ear hole.

  In other words, when the user speaks his / her own sound without closing his / her ears, his / her ears are covered with his / her ears on the basis of the volume of sound that can be heard in all the low-frequency range a, intermediate frequency range a and high-frequency range a. Then, the low sound side is amplified for the user's own voice. Also, if you utter a voice with your ears closed, your voice that can be heard through the outside air will not reach the ears. It feels like the volume on the side has decreased.

  This situation will be described with reference to FIG. 3 (a). As shown in FIG. 7 (b), the distribution of the frequency of speech uttered by the user reaching the user's ear when the ear is not closed is distributed. Assuming that the graph is D1, the distribution of the frequency of the voice uttered by the user reaching the user's ear when the ear is closed as shown in FIG. 7A becomes a distribution graph D2. That is, the distribution graph D2 has a louder volume on the bass side than the distribution graph D1.

  The distribution graphs D1 and D2 shown in FIG. 3A are transmitted directly from the user's mouth to the ear via the inside of the skull, and are raw voices that do not mediate the mobile phone 100.

  FIG. 3B shows the volume of the output sound from the bone conduction speaker unit 106 obtained in the above-described steps S03 to S06 (that is, the volume after the high frequency side is amplified with respect to the sound emitted by the user). ) Is a schematic representation of how it is heard by the user. First, the voice uttered by the user is input to the microphone unit 104 and becomes an input voice signal. Assume that the input sound signal is input with a sound whose frequency distribution is uniformly distributed over the entire low-frequency side b, intermediate frequency range b, and high-frequency side b as shown by D3 in FIG. 3B. . When this input audio signal is input to the treble amplifying unit 102 via the audio processing unit 103, processing for amplifying the treble side (details will be described later) is performed in the treble amplifying unit 102, and the distribution of the sound frequency is A distribution graph D4 in FIG. That is, the distribution graph D4 is generated by attenuating the volume on the low sound side b of the distribution graph D3 and amplifying the sound volume on the high sound side b.

  As described above with reference to FIG. 2, when the bone conduction speaker unit 106 is used in a state in which the correction setting on the high-pitched sound side is turned on, and when the user attempts to make a call with the ear closed, the following voice is transmitted to the user. Will hear. That is, as shown in FIG. 3 (c), the voice uttered by the user having the distribution shown in the distribution graph D2 (that is, the bass side is emphasized) and the distribution shown in the distribution graph D4 (the bass side is shown). A voice that has been attenuated and mixed with the voice uttered by the user (amplified on the high frequency side higher than the amplified low frequency side) and having a frequency distribution as shown in the distribution graph D5 in FIG. The user will hear. In other words, the voice uttered by the user passes through two types of routes, the route that enters the user's ear through the user's skull and the route that is output from the corrected bone conduction speaker unit 106. It acts on the cochlea of the auditory organ. Then, by synthesizing the voices passing through the two types of routes, the user's own voice has a volume distribution (D5) that is nearly uniform over the entire low frequency range c, intermediate frequency range c, and high frequency range c. Will be heard by the user.

  FIG. 4 illustrates this state more easily. FIG. 4 is a diagram illustrating a state in which the user uses the mobile phone 100. First, by closing the ear, one's own voice (D2 shown in FIGS. 3 and 4) can be heard as if the bass side was amplified compared to the case where the ear was not blocked. Therefore, when a call is made using the bone conduction speaker unit 106, the voice A is collected from the microphone unit 104, and the high sound side of the voice A is amplified by the high sound amplification unit 102 in the mobile phone 100. To do. The high-pitched sound side refers to a higher frequency range than the amplified low-pitched sound side that is heard through the user's skull. The own voice A (D4 shown in FIG. 3 and FIG. 4) with the high sound side amplified is output from the bone conduction speaker unit 106 together with the received voice. In this way, by simultaneously listening to the low D2 sound and the high D4 sound at the same time, the balance of the voice uttered by the user becomes uniform in the entire frequency range.

  Therefore, compared to when no treble correction is set, when the treble correction is set, the user can hear the user's voice in a balanced manner. This makes it possible to make a comfortable call as much as possible because the user can check his / her voice without feeling uncomfortable even if he / she makes a call in an environment where it is difficult to check his / her voice.

  However, it is preferable to enable more detailed settings when actually using the treble amplification function as in the present invention. This setting will be described in further detail.

  That is, the amplification amount and threshold value for treble amplification, which are the parameters described above, will be further described.

  As described above, the voice uttered by the user himself / herself is audible to the user because the volume on the bass side is increased in the skull, compared to the case where the ear is not blocked, as shown in FIG. Graph D2). In the present invention, the user's own voice amplified by the high-frequency side corresponding to the amplified low-side volume is output from the bone conduction speaker unit 106 (FIG. 3 / distribution graph D4). As shown in FIG. 3 and the distribution graph D5, the user's own voice is transmitted to the cochlea of the user's auditory organ in a well-balanced manner.

  By the way, in the present invention, the balance of the sound that can be heard by the user's ear is amplified by amplifying the high sound side of the sound input from the microphone unit 104 so that the low sound side is increased with respect to the high sound side in the skull. Is adjusted.

  However, the frequency distribution shown in FIG. 3 / distribution graph D2 is based on how the user's ears are closed, how the bone conduction speaker unit 106 is in contact, and so forth. The position of the area where the attenuation starts) changes. Accordingly, when the amplification factor for the input sound from the microphone unit 104 is constant, the user may hear a poor balance depending on how the user's ears are closed and how the bone conduction speaker unit 106 contacts.

  For example, as shown in FIG. 5, when the ear is tightly closed, the volume on the low sound side in the skull increases (FIG. 5 / D2A). The amount of amplification on the high sound side with respect to the input sound from the microphone unit 104 is small. On the contrary, if the ear is lightly blocked, the volume on the low frequency side of D2 in the skull does not increase (FIG. 5 / D2B). It is assumed that it will be too big.

  Similarly, depending on how the ears are closed and how the bone conduction speaker unit 106 is applied, as shown in FIG. 6, the input sound from the microphone unit 104 is to be amplified compared to the position of the intermediate region c of D2. It is also assumed that the minimum frequency value is too close to the low frequency side (FIG. 6 / D4A) or too close to the high frequency side (FIG. 6 / D4B).

  Therefore, in the present invention, it is preferable that the amplification amount for treble amplification and the threshold value of the frequency to be amplified can be changed by the key operation unit 108 of the user. When such a change operation by the user occurs, the changed value is set in the memory unit 109.

First, adjustment of the amplification amount for treble amplification will be described.
Amplification amount for treble amplification refers to the amount of amplification when the treble amplification unit 102 amplifies the high-pitched side of user-generated speech (hereinafter referred to as amplified speech) as shown by D4 in FIG. This is the parameter to point to. The control unit 101 of the mobile phone 100 is configured to be able to accept an operation described below by a user who desires to change such parameters, both during a call and during a non-call.

If the user feels that the volume of the low sound side of the voice D2A that the user feels at the cochlea during a call is too high (that is, the amplification on the high sound side is insufficient), the amount of amplification for high sound amplification is increased. Using the up and down keys of the key operation unit 108, the user instructs the control unit 101 to increase in steps. The control unit 101 monitors the input of the key operation unit 108 from the user during a call, and changes the amplification amount according to the operation content when a user operation occurs. When the operation is adjusted so that the balance between the low sound side and the high sound side is felt evenly (FIG. 5 / arrow M1), the determination key is pressed and the previously selected amplification amount is determined and stored in the memory unit 109.
On the other hand, when the user feels that the volume of the low sound side of his / her voice D2B is too low (that is, the high sound side is amplified too much), the amount of amplification for high sound amplification is used with the up and down keys of the key operation unit 108. The user can give an instruction to make it smaller step by step. When the operation is adjusted to such an extent that the balance between the low sound side and the high sound side is felt uniformly (FIG. 5 / arrow M2), the selected amplification amount is determined by pressing the enter key and stored in the memory unit 109.
In this way, even when the amplification amount on the high sound side is changed by the user, the control unit 101 is stored in the memory unit 109 in S04 of FIG. It is possible to amplify the user's voice input from the microphone unit 104 with reference to the amplification amount for high-frequency amplification so that the low-side volume and the high-side volume of the amplified sound are equal.

  By the operations described above, the volume of the low sound side of the sound within the user's own skull and the way of hearing the high sound side of the amplified sound through the microphone unit 104 are aligned, and the above two types of sounds are mixed. Thus, the user's own cochlea feels as a well-balanced volume over the entire frequency band as shown by D5A and D5B in FIG.

  Next, the threshold value will be described. The threshold is a frequency located at the boundary between the amplified low sound side and the amplified high sound side generated by the high sound amplifying unit 102 such as D4, D4A, and D4B in FIG. As in the case of the amplification amount for high-frequency amplification, the control unit 101 of the mobile phone 100 is configured to be able to accept the following operations of a user who desires to change such parameters, both during a call and during a non-call. .

  First, a description will be given of a case where the minimum value of the frequency to be amplified with respect to the input sound from the microphone unit 104 is too close to the low frequency side due to how the user's ears are closed or the bone conduction speaker unit 106 contacts. . That is, as shown in FIG. 6, a part of the low sound side of D2 that is directly audible in the skull that is amplified and heard and a high sound side of the amplified sound shown in D4A overlap, and the sound in the vicinity of the intermediate region is overlapped. This is a case where it sounds prominently like D5D in FIG. At this time, it is possible for the user to instruct the control unit 101 to increase the threshold stepwise by using the up and down keys of the key operation unit 108 (to approach the high frequency side). That is, the control unit 101 monitors the input of the key operation unit 108 from the user during a call, and changes the amplification amount according to the operation content when a user operation occurs. When the control unit 101 determines that an input of the enter key has occurred as an operation of the key operation unit 108, the control unit 101 determines the previously selected threshold value and stores the threshold value in the memory unit 109. As a result, when the user adjusts the sound in the vicinity of the intermediate area so that it can be heard moderately, the user can hear the sound with an appropriate balance by pressing the enter key.

  Contrary to the case described above, the minimum value of the frequency to be amplified with respect to the input sound from the microphone unit 104 is increased to the high frequency side depending on how the user's ears are closed and the bone conduction speaker unit 106 is in contact with the user. The case where it approaches too much is demonstrated. This means that the low sound side of D2 that is heard after amplification is too far from the high sound side of the amplified sound shown in D4B, and the sound near the middle region sounds small as shown in D5E of FIG. It is. At this time, by instructing the control unit 101 to decrease the threshold stepwise by using the left and right keys of the key operation unit 108, it is possible for the user to bring the threshold value toward the bass side. After that, when the sound is adjusted so that the sound near the intermediate area can be heard appropriately, when the determination key is pressed in the same manner as before, the threshold value selected earlier is determined and the threshold value is stored in the memory unit 109.

  In this way, the control unit 101 can output the user's voice input from the microphone unit 104 in a balanced manner by changing the above-described threshold value by a simple operation of the user.

  As a result of the above-described operations, the lowest frequency of the frequency range where the low-frequency volume of the sound within the user's own skull begins to attenuate and the high-frequency side frequency band of the amplified sound amplified via the microphone unit 104 is amplified. And the two kinds of sounds are mixed together, and the user's own cochlea is perceived as a well-balanced volume over the entire frequency band as shown by D5C in FIG.

Again, returning to the flowchart of FIG.
First, a description will be given of a case where when the communication unit 107 starts transmission / reception of an audio signal, the audio speaker unit 105 is set as the output destination of the audio signal even if the high-frequency correction setting is turned on.

  As described above, whether or not the bone conduction speaker unit 106 is used is confirmed in step S03. At this time, if the bone conduction speaker unit 106 is set not to be used (S03 / No), the process proceeds to step S07. In this case, the user's voice input from the microphone unit 104 is output to the audio speaker unit 105 without being subjected to high-frequency amplification. Alternatively, the voice uttered by the user input from the microphone unit 104 here may not be output from the audio speaker unit 105. This is because, if the setting is to use the audio speaker unit 105, it can be considered that the environment around the user is not under noise that can interfere with the call, so that unnecessary high-frequency amplification can be avoided. Can always confirm a natural voice.

  Next, step S08, which is a case where the high frequency correction setting is turned off (S02 / No) in step S02 when transmission / reception of an audio signal is started in communication unit 107, will be described.

  In this case, a call is performed by outputting from a speaker that is set to use only the audio signal received from the communication unit 107. In other words, when the voice speaker unit 105 is set to make a call, the voice speaker unit 105 sets the call using the bone conduction speaker unit 106. Output from the audio speaker unit 105. Also in this case, in the same way as in the previous case, in addition to the sound uttered by the other party, the voice uttered by the user may not be output or may be output without correcting the high tone.

  That is, when the correction setting on the high sound side is off, the side tone technique in which the input voice signal from the user input from the microphone unit 104 is output from the voice speaker unit 105 and the bone conduction speaker unit 106. Is not used. Therefore, it is possible to perform a normal call without considering the high tone correction.

Next, steps S09 and S10 will be described.
Initially, when a call is performed in a quiet environment, it is considered that a conventional call is performed using the voice speaker unit 105 without using the bone conduction speaker unit 106 used for listening to the received sound clearly. It is done. However, when the quiet environment becomes noisy in the middle of a call, it is assumed that the user first desires to change the output speaker from the voice speaker unit 105 to the bone conduction speaker unit 106.

  Furthermore, since the surrounding noise is too loud only by using the bone conduction speaker unit 106, it is conceivable that the user further closes his / her ear to block the noise. At this time, since the user feels that the low-pitched side of the user's own voice is amplified, the user may further desire to reduce it by using the correction setting on the high-pitched side.

  It can be considered that the environment changes as the surroundings of the user become noisy or quiet until the call is started (S01) and ended (S11) as described above. As described above, when the environment changes, it is preferable that the correction setting on the high-pitched sound side can be switched on / off (S09) and the speaker to be received can be switched (S10).

  That is, in step S09, the control unit 101 determines whether or not the user has instructed the key operation unit 108 to change the high-frequency correction setting during the period from the start to the end of the call of the mobile phone 100 according to the present invention. Always monitor at. If it is determined that there is an instruction to change, the setting is changed to OFF if the determination at this time is ON, and to ON if the determination is OFF, and the process returns to step S02.

  Similarly, the control unit 101 always monitors a speaker change instruction that is output before the call is terminated, and changes the instruction if there is a change instruction. That is, if the speaker set as the output destination of the received voice is the voice speaker unit 105, the setting is switched to the bone conduction speaker unit 106, and if the speaker is the bone conduction speaker unit 106, the setting is switched to the voice speaker unit 105, and the process returns to step S02 again.

  In this way, when the setting is changed as in S9 and S10 according to changes in the surrounding environment, the determination and processing from S2 to S08 are performed again based on the new setting. It can be used to maintain comfortable calls that match as much as possible.

  In this way, when the call is started, the control unit 101 continues the processing of S02 to S10, and when the end of the call occurs, the reception of the sound input from the microphone unit 104 and the output of the sound from the two speakers are stopped. The communication is terminated (S11).

  As described above, according to the present invention, when the bone conduction speaker unit 106 is used while closing the ear, the low-pitched side of the user's own voice is amplified and heard compared to the case where the bone conduction speaker unit 106 is used without closing the ear. This eliminates the problem that it is difficult to clearly confirm the user's own voice, and makes a comfortable call.

  In addition, when the cellular phone 100 is provided with the voice speaker unit 105 in addition to the bone conduction speaker unit 106, the bone conduction speaker unit 106 is suitable for conditions such as when the surroundings are noisy and the voice speaker unit 105 is not. It is assumed that they will be used properly. In such a case, when the received voice is output from the audio speaker unit 105, the surroundings are not noisy, and if the user's voice is amplified and output, it will be annoying to the user. Can be avoided.

  Furthermore, since the amplification amount of the sound from the microphone unit 104 can be changed, depending on how the ears are closed and how the bone conduction speaker unit 106 abuts for each user, the high volume side and the low side of the user's own voice The problem that the sound volume balance is lost is also solved.

  Similarly to the above contents, the volume in the middle region of the user's own voice is higher than the volume on the high-frequency side and the low-frequency side due to different methods of closing the ears and contact of the bone conduction speaker unit 106 for each user. The problem that the balance is lost due to being too small or too small is also solved.

  Further, even during a call, it is possible to switch whether or not the output destination of the audio speaker unit 105 / bone conduction speaker unit 106 is changed or corrected when the user desires.

  Although an example in which the input of the amplification amount and threshold value for treble amplification is indicated by the up / down key and the left / right key is shown, the present invention is not limited to this. For example, a numerical value is directly input by the numeric keypad, and the control unit 101 detects this. You may comprise so that the process corresponding to an input numerical value may be performed.

  In addition, although the example in which the switching of the correction setting on the high sound side and the switching of the setting of the output speaker during the call are sequentially performed one by one has been shown, it may be configured to be performed simultaneously.

  Although the present invention has been described by taking a mobile phone as an example, the present invention is not limited to this, and includes a bone conduction speaker unit 106 such as a PHS (Personal Handyphone System), a PDA (Personal Digital Assistants), and a portable game machine. Needless to say, this is feasible as long as the device can communicate with others.

It is a block diagram which shows the structure of the mobile telephone which concerns on embodiment. It is a flowchart which shows the process at the time of the telephone call of the mobile telephone which concerns on embodiment. 6 is a graph showing how a user can hear his / her voice when using the mobile phone according to the embodiment. It is the figure which showed a mode that the user is using the mobile telephone which concerns on embodiment. It is the graph shown about correction | amendment of the amplification amount of the audio | voice which the user uttered when using the mobile telephone which concerns on embodiment. It is the graph which showed correction | amendment of the threshold value of the low frequency attenuation | damping of the sound which the user uttered when using the mobile telephone which concerns on embodiment. It is the figure which showed the difference in how to hear when the ear is closed and when there is no block.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Mobile phone 101 ... Control part 102 ... High sound amplification part 103 ... Audio | voice processing part 104 ... Microphone part 105 ... Voice speaker part 106 ... Bone conduction speaker part 107 ...・ Communication unit 108 ... Key operation unit 109 ... Memory unit 110 ... Display unit

Claims (6)

A bone conduction speaker unit;
The microphone section,
A communication unit that connects to a communication network and transmits and receives audio;
A high-frequency amplifier for amplifying a high-frequency side of an input audio signal based on the audio input to the microphone unit;
When performing a call via the communication unit, the high sound side of the input sound signal based on the sound input to the microphone unit is caused to output the sound signal amplified by the high sound amplification unit to the bone conduction speaker unit A control unit for controlling
A mobile phone comprising: An audio speaker unit;
The controller is
When determining the output destination of the voice received by the communication unit to the bone conduction speaker unit, the case of using the voice speaker unit,
When the output destination of the audio received by the communication unit is the audio speaker unit, the input audio signal is output to the audio speaker unit without being amplified by the treble amplifier, or the input audio signal is Control not to output to the audio speaker,
The mobile phone according to claim 1. 3. The mobile phone according to claim 1, wherein the treble amplification unit is capable of changing an amplification amount on a treble side of the input audio signal to be amplified. The treble amplifier includes a high pass filter,
4. The mobile phone according to claim 1, wherein the control unit is capable of changing a reduction target threshold value on a bass side of the input audio signal by the high-pass filter. 5. The mobile phone according to claim 1, wherein the control unit is capable of changing a setting as to whether or not to perform treble amplification by the treble amplification unit using the operation unit. When a voice call is performed, a first step of determining whether the input voice received by the communication unit is output from the bone conduction speaker unit or the voice speaker unit;
When the input sound is output from the bone conduction speaker unit in the first step, the high sound side of the input sound signal based on the sound input to the microphone unit is amplified by the high sound amplification unit, and the high sound side is amplified. When outputting an audio signal to the bone conduction speaker unit and outputting the input audio from the audio speaker unit according to the first step, an input audio signal based on the audio input to the microphone unit is output at the treble amplification unit. A second step of outputting to the audio speaker unit without amplification or not outputting an input audio signal to the audio speaker unit;
An audio output control method comprising:

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