JP2007165940A - Cellular phone, and acoustic reproduction operation automatic stopping method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cellular phone capable of preventing useless consumption of a battery due to failure in stopping an acoustic signal reproduction operation. <P>SOLUTION: A detecting microphone 117 having high directivity is arranged near a headset speaker 116 of a headset 118 connected to a signal I/F unit 106 of the cellular phone 100 so that a reverberated sound from an ear-drum can be detected as an acoustic detection signal. When an acoustic signal from an audio signal generator 108 is heard with the headset 118 worn on ears, a signal comparator 107 compares the acoustic signal to be input into the headset 118 with the acoustic detection signal detected by the detecting microphone 117. If they do not match, it is considered that the headset 118 is put off from the ears and the operation of the audio signal generator 108 is stopped. Also, when a connection detector 105 detects that the headset 118 is not connected to the signal I/F 106 during listening using the headset 118, the operation of the audio signal generator 108 is stopped. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mobile phone and a method for automatically stopping sound reproduction operation of a mobile phone. In particular, the present invention relates to a technique for preventing wasteful power consumption when a small acoustic output device is removed from an ear when a small acoustic output device (such as a headset) is connected to a mobile phone to play music and listen.

  In recent years, the functions of mobile phones have been increasingly improved, and mobile phones having music playback functions (sound playback functions) have been widely sold in the market. As a method for realizing the music playback function of the mobile phone, a method of listening to music by ringing the speaker of the mobile phone main body, and a small sound output device such as a headset connected to the mobile phone main body and using a headset, etc. In general, a method of wearing and listening to a person's ear is used.

  Here, when a sudden errand occurs for a user who is listening to music (for example, when someone suddenly calls you, or when a sudden visitor or other incident occurs, suddenly quits hearing) In the situation where the latter is used to listen to music, that is, in the situation where a small acoustic output device such as a headset is connected to the mobile phone to listen to music, As a result of removing a small sound output device such as a headset from the ear and dealing with a sudden task, there is a possibility of forgetting that music was being played on the mobile phone thereafter. high. When such a situation occurs, music playback on the mobile phone continues to operate, the user's battery is wasted without being conscious of the user, and eventually the battery is completely discharged. There was a problem in use.

  In order to solve such a problem, in Japanese Unexamined Patent Application Publication No. 2004-164263 “Portable Electronic Device” disclosed in Patent Document 1, the reproduced music is heard in addition to the battery that supplies power to the telephone function unit of the mobile phone. A technology has been proposed in which an external battery is provided in the headphones, and power is supplied from the external battery to the music playback circuit in the mobile phone during music playback so that the mobile phone battery does not consume power. ing.

  Japanese Patent Application Laid-Open No. 11-275694 shown in Japanese Patent Application Laid-Open No. 11-275694 discloses a hearing aid equipped with an infrared sensor, and when the hearing aid is inserted into the ear, the amount of infrared radiation emitted by the ear tympanic temperature is measured by the infrared sensor. A technique has been proposed in which the power of the hearing aid is controlled to be turned on / off by measuring the power of the hearing aid.

In Japanese Patent Laid-Open No. 2003-029773 “Electronic device power control method and apparatus” disclosed in Patent Document 3, as an energy saving technique for an electronic device such as an MD player, the electronic device is connected to a mobile phone. A technique has been proposed in which the electronic device is set to be turned off when no operation is performed for a certain time with respect to an incoming call to the mobile phone.
JP 2004-164263 A (page 5-8) JP-A-11-275694 (page 3-4) JP 2003-029773 A (page 3-4)

  However, the conventional technology for preventing the power consumption of the mobile phone from being wasted has the following problems and is not an effective solution.

  For example, the technique of Patent Document 1 has a problem that it is necessary to provide an external battery for a headphone that is strongly demanded to be reduced in size and weight, and the headphone cannot be reduced in size and weight. In addition, the technique of Patent Document 2 is a so-called general-purpose technique that can be applied to an unspecified number of users because the amount of infrared rays emitted by the eardrum temperature is accompanied by individual differences among users. There is a risk of becoming insufficient. In addition, the technique of Patent Document 3 requires a mobile phone in addition to an electronic device to be power-saving, and is a technique that requires a user's operation, and tries to prevent wasteful power consumption effectively. There is a drawback that it is difficult to achieve the purpose.

  The present invention has been made in view of such circumstances, and an object of the present invention is a state in which a small sound output device externally connected to a mobile phone, such as a headset, is attached to the ear. Whether or not a small sound output device is removed from the ear during sound playback (music playback, etc.) When the connection between a small acoustic output device that listens to the reproduced sound, such as a headset, and a mobile phone is released, the playback operation of the sound signal such as a music signal is automatically stopped, so that It is an object of the present invention to provide a mobile phone and a method for automatically stopping sound reproduction operation of the mobile phone, which can prevent wasteful consumption and improve convenience in use.

  That is, when playing music or the like using a small acoustic output device such as a headset in a mobile phone, the presence or absence of the small acoustic output device such as a headset being attached to the human body is detected and not worn. If a small sound output device that listens to the reproduced sound, such as a headset, is not connected to the mobile phone, it automatically stops the sound playback operation such as music. This is intended to save power.

  In order to solve the above-described problems, the mobile phone and the method for automatically stopping the sound reproduction operation of the mobile phone according to the present invention employ the following characteristic configuration.

(1) An audio signal generation unit that generates an acoustic signal, an interface unit that can be connected to a small sound output device that is attached to a user's ear and hears sound, and the audio signal generation unit and the interface unit are connected. A strong directional detection microphone disposed at a position close to the speaker of the small acoustic output device and an acoustic ear output from the speaker of the small acoustic output device. A signal comparison unit that compares an acoustic detection signal in which reflected sound from the inside is collected by the detection microphone and converted into an electrical signal, and an acoustic signal output from the audio signal generation unit; As a comparison result of the signal comparison unit, when the acoustic signal and the acoustic detection signal do not match, the operation of the audio signal generation unit is stopped. Mobile phone that.
(2) As a comparison result of the signal comparison unit, when the acoustic signal and the acoustic detection signal do not coincide with each other, instead of immediately stopping the operation of the audio signal generation unit, it is determined in advance after detecting the inconsistency. (1) The mobile phone according to (1), wherein the operation of the audio signal generator is stopped when a mismatch is continuously detected until a predetermined time elapses.
(3) An audio signal generating unit that generates an acoustic signal, an interface unit that can be connected to a small acoustic output device that is worn on a user's ear and hears sound, and the audio signal generating unit and the interface unit are connected. A microswitch capable of detecting whether or not the small acoustic output device is worn on a user's ear, and further comprising the microswitch for the microswitch. A mobile phone that stops the operation of the audio signal generation unit when it is detected that the small sound output device is not worn on the user's ear.
(4) When the micro switch detects that the small sound output device is not worn on the user's ear, immediately, instead of stopping the operation of the audio signal generating unit, not wearing the small sound output device. The mobile phone according to (3), wherein the operation of the audio signal generator is stopped when it is continuously detected that a predetermined period of time has elapsed after detection.
(5) It further includes a connection detection unit that detects whether or not the small acoustic output device is connected to the interface unit, and the connection detection unit detects a connection between the small acoustic output device and the interface unit. In this case, the mobile phone according to any one of (1) to (4), wherein the operation of the audio signal generation unit is started and the audio signal generation unit and the small acoustic output device are connected by the connection unit.
(6) When the acoustic signal from the audio signal generation unit is in a state of outputting to the small acoustic output device, the connection detection unit is configured such that the small acoustic output device and the interface unit are not connected. (5) The mobile phone according to (5), wherein when detected, the operation of the audio signal generation unit is stopped and the connection between the audio signal generation unit and the small acoustic output device by the connection unit is released.
(7) A button unit operable by the user is further provided, and the user determines whether to permit activation of the operation of the audio signal generation unit and whether to stop the operation of the audio signal generation unit. The mobile phone according to any one of (1) to (6), which is instructed by operating a button unit.
(8) The mobile phone according to any one of (1) to (7), wherein the small acoustic output device is a headset.
(9) An audio signal generating unit that generates an acoustic signal, an interface unit that can be connected to a small acoustic output device that is worn on a user's ear and hears sound, and the audio signal generating unit and the interface unit are connected. An automatic sound reproduction operation of the mobile phone that automatically stops the operation of the audio signal generation unit that is the generation source of the acoustic signal heard by the small acoustic output device in a mobile phone including at least a connection unit In the stopping method, the reflected sound from the inside of the ear of the sound output from the speaker of the small acoustic output device is collected by a strong directional detection microphone arranged at a position close to the speaker of the small acoustic output device. A sound detection step for outputting as a sound detection signal, a sound signal output from the audio signal generator, and the sound detection signal. And a signal comparison step for comparing, and as a comparison result of the signal comparison step, if the acoustic signal and the acoustic detection signal do not match, the operation of the audio signal generator is stopped. A method for automatically stopping sound reproduction operation of a mobile phone.
(10) As a comparison result of the signal comparison step, when the acoustic signal and the acoustic detection signal do not match, immediately after detecting the mismatch, instead of stopping the operation of the audio signal generation unit (9) The method for automatically stopping the sound reproduction operation of the mobile phone according to (9), wherein the operation of the audio signal generation unit is stopped when a mismatch is detected continuously until a predetermined time elapses.
(11) An audio signal generating unit that generates an acoustic signal, an interface unit that can be connected to a small acoustic output device that is worn on a user's ear and hears sound, and the audio signal generating unit and the interface unit are connected. An automatic sound reproduction operation of the mobile phone that automatically stops the operation of the audio signal generation unit that is the generation source of the acoustic signal heard by the small acoustic output device in a mobile phone including at least a connection unit In the stopping method, the small acoustic output device is further provided with a microswitch capable of detecting whether the small acoustic output device is worn on a user's ear, and the small acoustic output device is provided by the microswitch. In the wearing detection step of detecting whether or not the device is worn on the user's ear, the small sound output device is Sound reproducing operation automatically stopped method for a portable phone to stop when it detects an operation of the audio signal generating unit that is not mounted to.
(12) In the wearing detection step, when it is detected by the micro switch that the small sound output device is not worn on the user's ear, the wearing is performed immediately instead of stopping the operation of the audio signal generating unit. In the mobile phone according to (11), the operation of the audio signal generator is stopped when it is continuously detected that a predetermined period of time has elapsed after it has been detected that the audio signal has not been detected. Sound playback operation automatic stop method.
(13) It further includes a connection detection step for detecting whether or not the small acoustic output device is connected to the interface unit, and the connection detection step detects a connection between the small acoustic output device and the interface unit. In this case, the operation of the audio signal generator is started, and the sound reproduction operation of the mobile phone according to any one of (9) to (12) that connects the audio signal generator and the small sound output device is automatically stopped. Method.
(14) When the acoustic signal from the audio signal generator is in a state of being output to the small acoustic output device, the connection detection step is that the small acoustic output device and the interface unit are not connected. When detected, the operation of the audio signal generation unit is stopped and the audio signal generation unit and the small sound output device are disconnected by the connection unit between the audio signal generation unit and the small acoustic output device. Method.
(15) The mobile phone further includes a button unit that can be operated by the user, and whether or not to permit activation of the operation of the audio signal generation unit and whether or not to stop the operation of the audio signal generation unit is used. The method for automatically stopping sound reproduction operation of the mobile phone according to any one of the above (9) to (14), which is instructed by a person operating the button unit.
(16) The method for automatically stopping sound reproduction operation of the mobile phone according to any one of (9) to (15), wherein the small acoustic output device is a headset.

  According to the mobile phone and the automatic sound playback operation stopping method for the mobile phone of the present invention, a small sound output device such as a headset is used as a sound playback function for music or the like that has come to be widely used as a function of the mobile phone. When playing sound such as music, it is detected whether or not a small sound output device such as a headset is attached to the human body, and it is detected that the device is not attached, or the reproduced sound is heard. When it is detected that a small sound output device such as a headset is not connected to the mobile phone, the playback of the sound such as music is automatically stopped. It is possible to prevent wasteful battery consumption caused by forgetting to stop the operation, and to improve convenience in using the mobile phone.

  Hereinafter, preferred embodiments of a mobile phone and a method of automatically stopping sound reproduction operation of the mobile phone according to the present invention will be described with reference to the accompanying drawings.

(Features of the present invention)
As one embodiment of the mobile phone and the automatic sound reproduction operation stopping method of the mobile phone according to the present invention, a small sound output device is used as a device for outputting reproduced music to the outside, and the small sound output device is a headset. In certain cases, the features of the present invention will be described.

  A microphone with strong directivity is applied to the handset of the headset, which is a small sound output device, and the reflected sound from the eardrum of sound (music, etc.) output from the speaker of the headset handset attached to the user's ear. Provided for detection. Since the microphone has a high directivity and is arranged so that only sound waves (such as music) from the eardrum direction in the ear can be collected, the headset is put on the ear. Thus, for the first time, it is possible to collect reflected sound of sound (such as music) output from the speaker of the headset.

  For this reason, when the headset is worn on the ear, the sound signal collected by the microphone and output from the microphone is obtained as the same signal as the sound signal input to the speaker of the headset. On the other hand, when the headset is removed from the ear, the microphone cannot collect the reflected sound of the sound output from the headset speaker, so the acoustic signal from the microphone and the sound input to the speaker are not collected. There is no relevance between the two signals and the signals, and the two signals do not match.

  Using such a relationship, the acoustic signal input to the speaker of the headset is compared with the acoustic signal collected by the microphone. If both are the same signal, the headset is used. It is determined that the device is worn on the user's ear, and control is performed so that music playback is activated. On the other hand, if both signals are different, the headset is removed from the user's ear. It is determined that it is in a state, and control for stopping music playback is performed to stop useless power supply.

(Configuration of Example)
The cellular phone of the present invention includes a function for detecting the connection of a small acoustic output device such as a headset to the cellular phone body, an output signal to a speaker of the small acoustic output device such as a headset, that is, a speaker input signal, and a small size. At least a function of comparing an output signal from a microphone built in a receiver such as a headset such as a headset, that is, a microphone output signal is provided, and as a comparison result, as described above, both signals are different. In some cases, a function of stopping useless power supply is realized by performing control to stop the music playback operation.

  FIG. 1 is a functional block diagram showing an example of a functional block configuration of a mobile phone that realizes the automatic sound playback operation stopping method for a mobile phone according to the present invention, and is a small acoustic output device that outputs sound reproduced by the mobile phone. As shown, the case where a headset is used is shown.

  The mobile phone 100 shown in FIG. 1 has a control unit 101 that controls the operation of the entire mobile phone 100, a display unit 102 such as a liquid crystal display, an operation button unit 103, various programs and data, as in a normal mobile phone. The apparatus includes a storage unit 104 that stores data, and further includes an antenna 123 that transmits and receives a radio signal to and from the radio base station, a radio unit 122, and a baseband processing unit 121. In addition, the mobile phone 100 includes a transmitter 119, a receiver 120 for inputting / outputting audio to / from the user of the mobile phone 100, and audio (analog signal) input / output to / from the user. And an audio signal processing unit 110 that converts digital signals handled by the baseband processing unit 121.

  Further, the cellular phone 100 shown in FIG. 1 has an audio signal generation unit 108, a baseband processing unit 121, and an audio for reproducing an acoustic signal (music signal, etc.) in order to enable reproduction / listening of sound (music, etc.). A speech path switching unit 111 for switching to the signal generating unit 108, a main body speaker 112, and a headset 118 provided outside (that is, a headset receiver 115 having a built-in headset speaker 116, a headset transmitter 114). A signal I / F (InterFace) unit 106 connected to the headset connection terminal 113, and a signal switching unit 109 for switching among the transmitter 119 and receiver 120, the main body speaker 112, and the signal I / F unit 106. I have.

  Further, the mobile phone 100 shown in FIG. 1 includes a detection microphone 117, a headset 118, and a signal that are built in the headset receiver 115 and have strong directivity in order to determine whether or not the sound (music) reproduction operation can be continued. A connection detection unit 105 that detects a connection with the I / F unit 106 and a signal comparison unit 107 that compares an acoustic signal input to the headset 118 and an acoustic detection signal output from the detection microphone 117 are provided. Yes.

(Description of operation of the embodiment)
Next, the operation of the mobile phone 100 shown in FIG. 1 will be further described.

  The control unit 101 of the mobile phone 100 has a function of detecting button information input by the user from the button unit 103, a function of displaying various information on the display unit 102, and a function of reading and writing data stored in the storage unit 104. , A function for starting and stopping the reproduction operation of the audio signal (acoustic signal) of the audio signal generation unit 108, a function for switching each speech path between the signal switching unit 109 and the speech path switching unit 111, and a connection detection unit 105, signal comparison It has at least a function of detecting signal information generated in the unit 107.

  The speech path switching unit 111 has a function of switching the connection of the audio signal processing unit 110 between the speech path of the baseband processing unit 121 and the speech path of the audio signal generation unit 108. By the control, connection of the speech path between the baseband processing unit 121 and the audio signal processing unit 110 or connection of the speech path between the audio signal generation unit 108 and the audio signal processing unit 110 is performed. In the case of a call by wireless communication via the antenna 123, the former baseband processing unit 121 and the audio signal processing unit 110 are connected to the call path, while the audio signal generation unit 108 reproduces sound (such as music). In this case, the latter audio signal generator 108 and voice signal processor 110 are connected to the speech path.

  Similarly, the signal switching unit 109 connects the audio signal processing unit 110 to a communication path with the transmitter 119 and the receiver 120, a communication path with the main body speaker 112, and a communication path with the signal I / F unit 106. In the case of a call by wireless communication via the antenna 123 under the control of the control unit 101, the communication path between the audio signal processing unit 110, the receiver 120, and the transmitter 119 is controlled. When the connection or reproduction sound is heard by the main body speaker 112, the voice signal processing unit 110 and the main body speaker 112 are connected to the communication path, or when the reproduction sound is heard by the headset speaker 116, the sound signal processing is performed. The communication path between unit 110 and signal I / F unit 106 is connected.

  Note that the handset 120, the handset 119, and the main body speaker 112 are acoustic units built in the main body of the mobile phone 100, while the headset 118 is an acoustic unit outside the mobile phone 100, that is, a small acoustic device. It is an output device and can be connected to the mobile phone 100 by connecting the headset connection terminal 113 to the signal I / F unit 106. That is, the cellular phone 100 has a signal I / F unit 106 that can be connected to an external headset 118. The headset receiver 115 and the headset transmitter 114 of the headset 118 The F unit 106 and the headset connection terminal 113 are connected.

  Further, the headset receiver 115 outputs a sound (music, etc.) by sounding by an acoustic signal (music signal, etc.) and a reflected sound of the sound (music, etc.) output from the headset speaker 116. And a detection microphone 117 having a strong directivity for collecting sound. FIG. 2 is an appearance image diagram showing an example of the appearance of the headset receiver 115 externally connected to the mobile phone 100 according to an embodiment of the present invention. As shown in FIG. 2, a headset speaker 116 is arranged at the center of the headset receiver 115 to be worn on the ear, and the sound output from the headset speaker 116 (at a position slightly deviated from the center) ( A detection microphone 117 that detects a reflected sound of a sound wave of music or the like, converts it into an electrical signal, and outputs it as an acoustic detection signal is disposed.

  The headset receiver 115 is connected to a headset line 115 a for transmitting and receiving an acoustic signal to the headset speaker 116 and an acoustic detection signal from the detection microphone 117 to and from the headset connection terminal 113. The headset line 115 a can be connected to the signal I / F unit 106 of the mobile phone 100 via the headset connection terminal 113.

  Further, in the mobile phone 100 shown in FIG. 1, the signal I / F unit 106 includes the headset connection terminal 113 of the headset 118 (that is, the headset receiver 115 and the headset transmitter 114) as the signal I / F unit. The connection detection unit 105 that detects that the connection is connected to the connection unit 106 is provided. When the headset connection terminal 113 of the headset 118 is connected to the signal I / F unit 106, the connection detection unit 105 starts the connection to the headset 118. Connection information indicating that is connected is sent to the control unit 101.

  The audio signal processing unit 110 has a function of converting a digital signal of audio data or sound (music) data into an analog signal format or converting an analog signal of audio data into a digital signal format. The digital signal of the audio data transmitted from 121 is converted into an analog signal, or the acoustic (music) data transmitted from the audio signal generator 108 is converted into an analog signal, and the transmitter 119 or the head is also converted. It has a function of converting an analog signal of voice data from the set transmitter 114 into a digital signal.

  With the above configuration, in the mobile phone 100 as shown in FIG. 1 which is an embodiment of the present invention, a normal call using the handset 120 and the handset 119 is possible. Further, when the headset 118 is connected, A call using the headset 118 of the headset receiver 115 and the headset 118 of the headset transmitter 114 is also possible.

  In addition, when the user operates the button unit 103 to instruct activation of music reproduction, the control unit 101 detects button information instructing activation of music reproduction. As a result, the control unit 101 activates the audio signal generation unit 108, performs switching control of the speech path switching unit 111, and outputs an acoustic signal (such as a music signal) from the audio signal generation unit 108 to the main body speaker 112. The main body speaker 112 is sounded.

  Further, when the user connects the headset connection terminal 113 of the headset 118 (that is, the headset receiver 115 and the headset transmitter 114) to the signal I / F unit 106 in such a music playback state, the connection is made. Connection information indicating that the connection has been made is input from the connection detection unit 105 to the control unit 101. As a result, the control unit 101 performs switching control of the signal switching unit 109, switches from the main body speaker 112 to the signal I / F unit 106 side, and transmits an acoustic signal (music signal or the like) from the audio signal generation unit 108 to the head. The sound is output to the headset speaker 116 side of the set receiver 115 and the headset speaker 116 is sounded.

  At the same time, when the headset speaker 116 of the headset receiver 115 is switched to a state in which sound (music, etc.) is output, the acoustic signal (music signal, etc.) input to the headset speaker 116 is A sound wave of sound (music or the like) input to one input terminal and output from the headset speaker 116 is reflected by the eardrum in the ear and is detected by the detection microphone 117 built in the headset receiver 115. The collected sound is converted into an acoustic detection signal. The sound detection signal collected and converted by the detection microphone 117 is input to the other input terminal of the signal comparison unit 107.

  Here, an example of the circuit configuration of the signal comparison unit 107 will be described. FIG. 3 is a schematic circuit diagram showing an example of a circuit configuration of the signal comparison unit 107 of the mobile phone 100 according to the embodiment of the present invention. The circuit of the signal comparison unit 107 is connected to the positive side input terminal and the negative side input terminal of the comparator 308 via series input resistors R2 302 and R3 303 connected in series to the input terminals Sin1 305 and Sin2 306, respectively. An output terminal Sout 307 of the comparator 308 is connected to the level determination unit 309.

  As described above, the acoustic signal (music signal or the like) input to the headset speaker 116 and the acoustic detection signal collected and converted by the detection microphone 117 are input to the input terminals Sin1 305 and Sin2 306, respectively. And input to the positive and negative input terminals of the comparator 308, respectively.

  Therefore, for example, as shown in FIG. 4, both the acoustic signal (music signal and the like) input to the headset speaker 116 and the acoustic detection signal collected and converted by the detection microphone 117 are completely absent. If the signal waveforms are the same, the signal component is not output at all to the output terminal Sout 307 of the comparator 308 due to the addition of opposite phases in the comparator 308, and the level determination unit 309 indicating the comparison result Is also a “0 level” signal (coincidence signal). FIG. 4 shows a case where the acoustic signal (music signal, etc.) to the headset speaker 116 of the mobile phone 100 according to the embodiment of the present invention and the acoustic detection signal from the detection microphone 117 are the same signal. 6 is a signal waveform diagram illustrating an example of an output waveform of a level determination unit 309 of the signal comparison unit 107. FIG.

  On the other hand, as shown in FIG. 5, the signals of the sound signal (music signal etc.) input to the headset speaker 116 and the sound detection signal collected and converted by the detection microphone 117 are completely different. When the signals are waveforms and are unrelated to each other, a large signal is output to the output terminal Sout 307 of the comparator 308, and the output from the level determination unit 309 indicating the comparison result is both signals. To indicate that they are different from each other, a signal of a predetermined signal level (mismatch signal) is obtained. FIG. 5 shows a case where an acoustic signal (music signal or the like) to the headset speaker 116 of the mobile phone 100 according to an embodiment of the present invention is different from an acoustic detection signal from the detection microphone 117. 6 is a signal waveform diagram illustrating an example of an output waveform of a level determination unit 309 of the signal comparison unit 107. FIG.

  Each of the resistors R1 301 to R4 304 is a resistor for adjusting the gain of each input signal at the input terminals Sin1 305 and Sin2 306, and the signal level of both input signals is adjusted by adjusting each resistance value. Can be corrected.

  As described above, the signal indicating the comparison result output from the output terminal Sout 307 of the comparator 308 (that is, the signal indicating the determination result of the presence / absence of the signal) is input to the level determination unit 309 and the signal level is Compared with a predetermined threshold value, a comparison determination signal indicating whether the two input signals to the signal comparison unit 107 match or does not match is output. The comparison determination signal of the signal comparison unit 107 is output to the control unit 101.

  Note that the operations of the baseband processing unit 121, the radio unit 122, and the antenna 123 of the mobile phone 100 shown in FIG. 1 are not directly related to the sound playback operation such as music playback or the sound playback stop operation that is the subject of the present invention. Therefore, although detailed description is omitted here, functions specific to the mobile phone are realized as in the case of a normal mobile phone.

(Explanation of operation example of sound reproduction operation automatic stop method)
Next, an example of the operation | movement which shows the sound reproduction operation | movement automatic stop method in the mobile telephone 100 of FIG. 1 which is one Example of this invention is demonstrated, referring drawings.

  First, the output and reflection of sound waves (music, etc.) when the headset receiver 115 is worn on the ear will be described with reference to FIG. FIG. 6 is an explanatory diagram for explaining an outline of sound waves (such as music) when the headset receiver 115 externally connected to the mobile phone 100 according to an embodiment of the present invention is worn on the ear. is there.

  When the headset receiver 115 is attached to the ear, the hole of the ear 401 is a narrow space, and the headset receiver 115 attached to the ear 401 comes into close contact with the ear wall in a state close to the outside and sealing. For this reason, as shown in FIG. 6, after acoustic waves (such as music) output from the headset speaker 116 of the headset receiver 115 travel straight through the hole (ear canal) of the ear 401 to the eardrum 402, Reflected by the eardrum 402. As a result, it is propagated as reflected sound toward the headset speaker 116, collected by the detection microphone 117 disposed in the vicinity of the headset speaker 116, converted into an electrical signal as an acoustic detection signal, and extracted. The sound detection signal extracted from the detection microphone 117 is input to the other input terminal of the signal comparison unit 107 as described with reference to FIG.

  On the other hand, when the headset receiver 115 is not worn on the ear, sound waves (such as music) output from the headset speaker 116 of the headset receiver 115 are emitted to a wide space, and the headset Sound waves of sound (such as music) output from the speaker 116 are not reflected toward the headset speaker 116. For this reason, the strong directivity detection microphone 117 arranged in the vicinity of the headset speaker 116 cannot collect the reflected sound of the sound (music, etc.) output from the headset speaker 116. That is, only environmental noise in the vicinity of the detection microphone 117 that is completely different from the sound wave (such as music) from the headset speaker 116 is collected in the detection microphone 117, converted, and input to the other side of the signal comparison unit 107. It will be input to the terminal.

  Next, an example of the operation | movement which shows the sound reproduction operation | movement automatic stop method in the mobile telephone 100 of FIG. 1 which is one Example of this invention is demonstrated using the control flowchart of FIG. FIG. 7 is a control flowchart for explaining an example of the operation of the method for automatically stopping the sound reproduction operation in the mobile phone 100 according to the embodiment of the present invention, which is activated at predetermined intervals. Processing is shown.

  The control unit 101 reads data of a music activation flag indicating the presence / absence of a music playback operation from the storage unit 104 (step S1), and determines whether the music activation flag is ON or OFF (step S2). In the initial initial state, if the sound playback operation (music playback operation etc.) is not started, the music start flag is OFF (NO in step S2), so the operation of the audio signal generator 108 is stopped. Then, after controlling the speech path switching unit 111 to connect the baseband processing unit 121 and the audio signal processing unit 110 (step S3), the monitoring state of the music playback activation operation by the user is continued (step S3). S4).

  If the user has not performed a button operation for starting playback of music on the button unit 103 (NO in step S4), this process is terminated, and this state is maintained until this control flowchart is started again in the next cycle. continue.

  On the other hand, when the user gives an instruction to start music playback by operating the button 103 (YES in step S4), the music start flag is set to ON and registered in the storage unit 104 (step S5). Thereafter, this process is terminated, and this state is continued until this control flowchart is started again in the next cycle.

  When the user gives an instruction to start music playback by operating the button unit 103 (YES in step S4), when this process is started again in the next cycle, in the control flowchart started in the next cycle As a result of the determination process of the music activation flag, it is determined that the music activation flag is in the ON state (YES in step S2). Therefore, the control unit 101 activates the audio signal generation unit 108 and the speech path switching unit 111. And the audio signal generator 108 and the audio signal processor 110 are connected (step S6). Next, a state is entered in which the stop of music playback due to the button operation of the user's button unit 103 is monitored (step S7). If the audio signal generation unit 108 has already been activated and the audio signal generation unit 108 and the audio signal processing unit 110 have already been connected, the state of the audio signal generation unit 108 is continued. No further activation or further control of the speech path switching unit 111 is performed.

  When the user performs an operation for stopping music playback by operating the button unit 103 (YES in step S7), the music activation flag is set to OFF and registered in the storage unit 104 (step S8). The process is terminated, and this state is continued until the control flowchart is started again in the next cycle.

  When the music activation flag is set to the OFF state, it is determined that the music activation flag is in the OFF state as a result of the music activation flag determination process in the control flowchart activated in the next cycle (NO in step S2). Then, the operation of the audio signal generation unit 108 is stopped, and the speech path switching unit 111 is controlled to connect the baseband processing unit 121 and the audio signal processing unit 110 (step S3).

  On the other hand, when the user continues the music reproduction without performing the operation of stopping the music reproduction by the button operation of the button unit 103 (YES in Step S7), the control unit 101 detects the detection result of the connection detection unit 105. (Step S9), it is determined whether or not the headset connection terminal 113 of the headset 118 (that is, the headset receiver 115 and the headset transmitter 114) is connected to the signal I / F unit 106 ( Step S10).

  When the headset connection terminal 113 of the headset 118 is not connected to the signal I / F unit 106 (NO in step S10), the control unit 101 controls the signal switching unit 109 to control the audio signal processing unit 110 and the main body. The speaker 112 is connected to output an acoustic signal (music signal or the like) from the audio signal generator 108 to the main body speaker 112 side (step S11). Through this series of operations, music reproduction sound is reproduced from the main body speaker 112 of the mobile phone 100.

  On the other hand, when the headset connection terminal 113 of the headset 118 is connected to the signal I / F unit 106 (YES in step S10), the control unit 101 recognizes the connection of the headset 118 via the connection detection unit 105. Then, the signal switching unit 109 is controlled to connect the audio signal processing unit 110 and the signal I / F unit 106, and an acoustic signal (music signal or the like) from the audio signal generation unit 108 is transmitted to the signal I / F unit 106. (Step S12). By such connection switching control, the music reproduction sound from the audio signal generation unit 108 is reproduced from the headset receiver 115 via the signal I / F unit 106 and the headset connection terminal 113.

  At this time, an acoustic signal (music signal or the like) output to the headset speaker 116 is branched at a portion that has passed through the signal switching unit 109 and is also input to one input terminal of the signal comparison unit 107. . When the headset 118 is attached to the ear, sound waves of sound (such as music) output from the headset speaker 116 of the headset receiver 115 travel through the ear canal of the ear 401 as described in FIG. It goes straight and is reflected by the eardrum 402 and reaches the headset receiver 115 as reflected sound. The reflected sound is collected by a detection microphone 117 disposed in the vicinity of the headset speaker 116 of the headset receiver 115, converted into an electrical signal, and output as an acoustic detection signal. The acoustic detection signal output from the detection microphone 117 is input to the other input terminal of the signal comparison unit 107.

  As described above, when the headset 118 is worn on the ear, as shown in FIG. 4 described above, acoustic signals to the headset speaker 116 respectively input to the two input terminals of the signal comparison unit 107 ( Music signal, etc.) and the acoustic detection signal from the detection microphone 117 are obtained as substantially the same signal waveform, so that both signals match in the comparator 308 of the signal comparison unit 107 as described above. And a signal (match signal) of signal level “0” indicating that the two signals match each other is output as a comparison determination signal from the level determination unit 309 of the signal comparison unit 107. The

  Therefore, the control unit 101 reads the comparison determination signal from the level determination unit 309 of the signal comparison unit 107 (step S13), and the comparison determination signal indicates that the signal level “0” indicates that both signals match. ”Signal (match signal) (YES in step S14), it is determined that the headset 118 is attached to the ear, and the sound reproduction operation such as music reproduction by the headset 118 is continued. Will do.

  On the other hand, when the headset 118 shifts from the state in which the headset 118 is attached to the ear to the state in which the headset 118 is removed from the ear, the reflection of the sound (music, etc.) from the headset speaker 116 generated inside the ear. Since the sound does not reach the headset speaker 116 and the detection microphone 117 provided in the vicinity of the headset speaker 116 is a highly directional microphone, the direct sound output from the headset speaker 116, that is, The sound waves of the sound (such as music) itself output from the headset speaker 116 cannot be detected. Therefore, the detection microphone 117 collects ambient noise that is completely unrelated to the sound wave of the sound (music, etc.) output from the headset speaker 116.

  That is, when the headset 118 is removed from the ear during sound playback operation such as music playback, the headsets are respectively input to the two input terminals of the signal comparison unit 107 as shown in FIG. Since the acoustic signal (music signal, etc.) to the speaker 116 and the acoustic detection signal from the detection microphone 117 are obtained as completely different signals, the comparator 308 of the signal comparison unit 107 indicates that the two signals do not match. A comparison result signal is obtained, and as a comparison determination signal from the level determination unit 309 of the signal comparison unit 107, a “signal present” signal (mismatch signal) having a large signal level indicating that the two signals do not match is output. The

  Therefore, the control unit 101 reads the comparison determination signal from the level determination unit 309 of the signal comparison unit 107 (step S13), and the signal level indicating that the two signals do not match is large as the comparison determination signal. If the signal is “signal present” (non-coincidence signal) (NO in step S14), it is determined that the headset 118 has been removed from the ear, the music activation flag is set to the OFF state, and the storage unit 104 is registered (step S15).

  Since the music activation flag is set to the OFF state, it is determined again that the music activation flag is in the OFF state as a result of the music activation flag determination process in the control flowchart activated in the next cycle (step S2). NO) again, the operation of the audio signal generation unit 108 is stopped, and the speech path switching unit 111 is further controlled to connect the baseband processing unit 121 and the audio signal processing unit 110 (see FIG. Step S3). As a result, it is possible to suppress wasteful power consumption associated with an acoustic reproduction operation (such as a music reproduction operation) that the user is not hearing.

(Explanation of the effect of this embodiment)
As described above, according to the present embodiment showing an example of the present invention, the headset 118 attached to the ear is connected to the mobile phone 100, and as a playback sound, for example, to a user who listens to music. If the headset 118 is unintentionally removed from the ear, such as when sudden errand occurs, it is highly likely that the sound playback operation such as music playback is forgotten to be stopped. Finally, there is an effect that it is possible to improve the problem in use of the mobile phone 100 that the battery is finally discharged.

  In the description of the embodiment of the present invention, the detection microphone 117 is incorporated in the headset receiver 115 to detect whether the headset 118 is attached to the ear. In addition, for example, the same effect can be obtained even if the headset 118 is equipped with a micro switch that can detect the wearing of the headset 118 to the ear and the method of detecting the presence or absence of the wearing of the headset 118 by using the micro switch or the like. Is obtained.

  Furthermore, during the sound reproduction operation such as music reproduction, the sound wave of the sound such as music is not output to the main body speaker 112, that is, the state where the reproduction sound such as music is output from the headset 118. When the connection detection unit 105 detects that the headset 118 is not connected to the mobile phone 100, the sound reproduction operation such as music reproduction may be stopped.

  Further, in the above-described embodiment, when the user performs a button operation for instructing activation of a sound reproduction operation such as music reproduction, the music activation flag is turned ON and the operation of the audio signal generation unit 108 is activated. As shown, the button operated by the user indicates whether or not the activation of the sound reproduction operation such as music reproduction is permitted, and the head connected to the mobile phone 100 in a state where this button operation is performed. The operation of the audio signal generator 108 may be activated only when it is detected that the set 118 is worn on the ear.

  In the above-described embodiment, the case where the sound reproduction operation such as music reproduction is immediately stopped when it is detected that the headset 118 is not worn on the ear has been described. It is not limited to such a case. Even if the headset 118 is accidentally detached from the ear, if the headset 118 is put on the ear again, the sound such as the reproduced music can be continuously heard. Good.

  That is, even if it is detected that the headset 118 is not worn on the ear, the sound reproduction operation such as music reproduction is not stopped until a predetermined time elapses, Even if the headset 118 is not worn on the ear even within a certain period of time, the sound reproduction operation such as music reproduction may be stopped for the first time. Further, when it is detected that the headset 118 is not worn on the ear, the user may be warned by a warning lamp or a warning sound.

  The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such examples are merely illustrative of the invention and do not limit the invention in any way. Those skilled in the art will readily understand that various modifications and changes can be made according to a specific application without departing from the gist of the present invention.

It is a functional block diagram showing an example of a functional block configuration of a mobile phone that implements the automatic sound reproduction operation stopping method of the mobile phone of the present invention. It is an external appearance image figure which shows an example of the external appearance of the headset receiver externally connected to the mobile telephone which is one Example of this invention. It is a schematic circuit diagram which shows an example of the circuit structure of the signal comparison part of the mobile telephone which is one Example of this invention. Output waveform of level determination unit of signal comparison unit when acoustic signal (music signal, etc.) to headset speaker of mobile phone according to one embodiment of the present invention and acoustic detection signal from detection microphone are the same signal It is a signal waveform diagram which shows an example. Output waveform of level judgment unit of signal comparison unit when acoustic signal (music signal, etc.) to headset speaker of mobile phone according to one embodiment of the present invention is different from acoustic detection signal from detection microphone It is a signal waveform diagram which shows an example. It is explanatory drawing for demonstrating the outline | summary of the sound wave of sound (music etc.) at the time of mounting | wearing with the ear | edge headset receiver externally connected to the mobile telephone which is one Example of this invention. It is a control flowchart for demonstrating an example of the operation | movement which shows the sound reproduction operation | movement automatic stop method in the mobile telephone which is one Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Cellular phone 101 Control part 102 Display part 103 Button part 104 Memory | storage part 105 Connection detection part 106 Signal I / F (InterFace) part 107 Signal comparison part 108 Audio signal generation part 109 Signal switching part 110 Voice signal processing part 111 Call path switching Unit 112 main unit speaker 113 headset connection terminal 114 headset transmitter 115 headset receiver 115a headset line 116 headset speaker 117 detection microphone 118 headset 119 transmitter 120 receiver 121 baseband processing unit 122 wireless unit 123 antenna 301 Resistance R1
302 Series input resistance R2
303 Series input resistance R3
304 resistor R4
305 Input terminal Sin1
306 Input terminal Sin2
307 Output terminal Sout
308 Comparator 309 Level determination unit 401 Ear 402 Tympanic membrane

Claims (16)

  An audio signal generating unit that generates an acoustic signal, an interface unit that can be connected to a small acoustic output device that is attached to a user's ear and hears sound, and a connection unit that connects the audio signal generating unit and the interface unit And a strong directional detection microphone arranged at a position close to the speaker of the small acoustic output device, and an acoustic ear output from the speaker of the small acoustic output device. A signal comparison unit that compares an acoustic detection signal in which reflected sound is collected by the detection microphone and converted into an electrical signal, and an acoustic signal output from the audio signal generation unit; As a comparison result of the comparison unit, when the acoustic signal and the acoustic detection signal do not match, the operation of the audio signal generation unit is stopped. Mobile phone and said.   As a comparison result of the signal comparison unit, when the acoustic signal and the acoustic detection signal do not match, instead of immediately stopping the operation of the audio signal generating unit, a predetermined time after detecting the mismatch 2. The mobile phone according to claim 1, wherein the operation of the audio signal generation unit is stopped when a mismatch is continuously detected until the time elapses.   An audio signal generating unit that generates an acoustic signal, an interface unit that can be connected to a small sound output device that is worn on a user's ear and hears sound, and a connection unit that connects the audio signal generating unit and the interface unit And at least a microswitch capable of detecting whether or not the small acoustic output device is worn on a user's ear, wherein the microswitch is the small acoustic device. A mobile phone characterized by stopping the operation of the audio signal generator when it is detected that a sound output device is not attached to a user's ear.   After detecting that the micro switch is not wearing the small sound output device, instead of immediately stopping the operation of the audio signal generating unit instead of stopping the operation of the audio signal generating unit. 4. The mobile phone according to claim 3, wherein the operation of the audio signal generation unit is stopped when it is continuously detected that the device is not worn until a predetermined time elapses.   Further comprising a connection detection unit that detects whether or not the small acoustic output device is connected to the interface unit, and when the connection detection unit detects a connection between the small acoustic output device and the interface unit, 5. The mobile phone according to claim 1, wherein an operation of an audio signal generation unit is activated, and the audio signal generation unit and the small acoustic output device are connected by the connection unit.   When the connection detection unit detects that the small sound output device and the interface unit are not connected when the sound signal from the audio signal generation unit is in a state of being output to the small sound output device. 6. The mobile phone according to claim 5, wherein the operation of the audio signal generation unit is stopped and the connection by the connection unit between the audio signal generation unit and the small acoustic output device is released.   A button unit operable by the user is further provided, and whether the activation of the operation of the audio signal generation unit is permitted or not and whether the user stops the operation of the audio signal generation unit. The cellular phone according to any one of claims 1 to 6, wherein an instruction is given by operation.   The mobile phone according to claim 1, wherein the small acoustic output device is a headset.   An audio signal generating unit that generates an acoustic signal, an interface unit that can be connected to a small sound output device that is worn on a user's ear and hears sound, and a connection unit that connects the audio signal generating unit and the interface unit And a method of automatically stopping the sound reproduction operation of the mobile phone that automatically stops the operation of the audio signal generation unit that is the generation source of the acoustic signal heard by the small sound output device in a mobile phone comprising: The sound detection is performed by collecting the reflected sound from the inside of the ear of the sound output from the speaker of the small sound output device by the strong directivity detection microphone arranged at a position close to the speaker of the small sound output device. An acoustic detection step for outputting as a signal; an acoustic signal output from the audio signal generator; and the acoustic detection signal; A signal comparison step for comparing, and as a comparison result of the signal comparison step, when the acoustic signal and the acoustic detection signal do not match, the operation of the audio signal generation unit is stopped. A method for automatically stopping sound reproduction operation of a mobile phone.   As a comparison result of the signal comparison step, when the acoustic signal and the acoustic detection signal do not match, instead of immediately stopping the operation of the audio signal generating unit, a predetermined time after detecting the mismatch 10. The method for automatically stopping sound reproduction operation of a mobile phone according to claim 9, wherein the operation of the audio signal generation unit is stopped when mismatch is continuously detected until the time elapses.   An audio signal generating unit that generates an acoustic signal, an interface unit that can be connected to a small sound output device that is worn on a user's ear and hears sound, and a connection unit that connects the audio signal generating unit and the interface unit And a method of automatically stopping the sound reproduction operation of the mobile phone that automatically stops the operation of the audio signal generation unit that is the generation source of the acoustic signal heard by the small sound output device in a mobile phone comprising: The micro sound output device is further provided with a micro switch capable of detecting whether or not the small sound output device is worn on a user's ear, and the micro sound switch allows the user to connect the small sound output device to the user's ear. In the wearing detection step for detecting whether or not the device is worn on the ear, the small sound output device is worn on the user's ear. When it is detected that no sound reproducing operation automatically stopped method for a portable telephone, characterized in that it stops the operation of the audio signal generating unit.   In the wearing detection step, when the micro switch detects that the small sound output device is not worn on the user's ear, it is not worn instead of immediately stopping the operation of the audio signal generator. 12. The operation of the audio signal generation unit according to claim 11, wherein when it is detected that it is not worn until a predetermined time elapses after it is detected, the operation of the audio signal generator is stopped. A method for automatically stopping sound reproduction operation of a mobile phone.   It further includes a connection detection step for detecting whether or not the small acoustic output device is connected to the interface unit, and the connection detection step detects a connection between the small acoustic output device and the interface unit, 13. The automatic sound reproduction operation of the mobile phone according to claim 9, wherein the audio signal generation unit is activated to connect the audio signal generation unit and the small acoustic output device. How to stop.   When the connection detection step detects that the small sound output device and the interface unit are not connected when the sound signal from the audio signal generation unit is in a state of being output to the small sound output device. 14. The sound reproduction of the mobile phone according to claim 13, wherein the operation of the audio signal generation unit is stopped and the connection between the audio signal generation unit and the small acoustic output device by the connection unit is released. Automatic operation stop method.   The mobile phone further includes a button unit operable by the user, whether to permit activation of the operation of the audio signal generation unit, whether to stop the operation of the audio signal generation unit, The method for automatically stopping sound reproduction operation of a mobile phone according to any one of claims 9 to 14, wherein an instruction is given by operating a button unit.   16. The method for automatically stopping a sound reproduction operation of a mobile phone according to claim 9, wherein the small sound output device is a headset.

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