Wireless audio system and wireless earphone

Abstract

[Problem] To more accurately measure biological information during listening to audio by using wireless earphones and provide an alert regarding a change in health condition.　[Solution] Wireless earphones 1-1, 1-2: are provided with ear-type body temperature sensors; transmit, to a wireless terminal 2, periodic measurement results of the body temperature measured in the ears by the ear-type body temperature sensors; and, if an alert message is received from the wireless terminal 2 while playing / outputting audio data, interrupt the output of the audio data or reduce the output volume and output the alert message. The wireless terminal 2 periodically acquires the outside air temperature, and if the acquired outside air temperature and the measurement results of the body temperature received from the wireless earphones 1-1, 1-2 indicate the possibility of a change in the health condition of a user, transmits an alert message indicating said possibility to the wireless earphones 1-1, 1-2.

Description

Wireless Audio System and Wireless Earphone

[0001] The present invention relates to a wireless audio system capable of listening to audio using a wireless earphone.

[0002] In recent years, wireless earphones that wirelessly connect to audio devices such as smartphones and portable audio players via short-range wireless communication such as Bluetooth (registered trademark), receive audio content transmitted from the audio devices, and play and output it have become widespread (for example, Patent Document 1). Unlike wired earphones, wireless earphones are highly convenient because there is no need to worry about the handling of the cord connecting the earphone and the audio device.

[0003] In addition, in recent years, wristwatch-type wearable devices (smartwatches) that measure biometric information such as body temperature of a user and display the measurement results have also become widespread (for example, Patent Document 2).

[0004] Japanese Unexamined Patent Application Publication No. 2021-029006 International Publication No. WO2016 / 186349

[0005] According to the wristwatch-type wearable device, the user can judge their physical condition based on the displayed measurement result of the biometric information.

[0006] However, when listening to audio such as music using a wireless earphone, the user may become concentrated on the audio and may not notice a change in their physical condition or may neglect to check the measurement result displayed on the wearable device. In addition, since the wristwatch-type wearable device measures biometric information such as body temperature while being worn on the user's wrist, for example, during the user's exercise (when the wrist is moving), the wearable device's wearing state is likely to change, and thus it may not be possible to accurately measure the biometric information.

[0007] The present invention has been made in view of the above circumstances, and an object thereof is to provide a technology capable of measuring the biometric information of a user listening to audio with a wireless earphone with higher accuracy and alerting the user to a change in physical condition.

[0008] To solve the above problems, the present invention comprises a wireless terminal that functions as an audio device, and a wireless earphone that receives, plays, and outputs audio data transmitted from the wireless terminal. Here, the wireless earphone is equipped with an ear-type body temperature sensor, which periodically measures the body temperature inside the ear and transmits the result to the wireless terminal. Furthermore, if it receives a warning message from the wireless terminal while playing or outputting audio data, it interrupts the output of the audio data or reduces the output volume and outputs the warning message. On the other hand, the wireless terminal periodically acquires the outside temperature, and if the measurement results of this outside temperature and the body temperature received from the wireless earphone indicate a possible change in the user's physical condition, it transmits a warning message to the wireless earphone to that effect. Here, the wireless terminal may periodically acquire the outside temperature using its own outside temperature sensor, or it may periodically access a web server that provides weather information services and acquire outside temperature information for the area including the current location from this web server. Alternatively, an outside temperature sensor may be provided in the wireless earphone, and the measurement results of body temperature and outside temperature may be periodically acquired from the wireless earphone.

[0009] For example, the wireless audio system of the present invention is a wireless audio system comprising a wireless terminal that functions as an audio device and a wireless earphone that receives, plays, and outputs audio data transmitted from the wireless terminal, wherein the wireless earphone has an ear-type body temperature sensor that periodically measures the body temperature inside the ear, a measurement result transmission means that transmits the measurement result of the body temperature inside the ear by the ear-type body temperature sensor to the wireless terminal, and a warning means that, when a warning message is received from the wireless terminal during playback or output of the audio data, interrupts the output of the audio data or reduces the output volume and outputs the warning message, wherein the wireless terminal has an outside temperature acquisition means that periodically acquires the outside temperature, a body temperature receiving means that receives the measurement result of the body temperature from the wireless earphone, and a warning message transmission means that, when the measurement result of the outside temperature acquired by the outside temperature acquisition means and the body temperature received by the body temperature receiving means indicate a possible change in the user's physical condition, sends a warning message to the wireless earphone to that effect.

[0010] Furthermore, the wireless earphone of the present invention is a wireless earphone that receives, plays, and outputs audio data transmitted from a wireless terminal that functions as an audio device, and comprises: an ear-type body temperature sensor that periodically measures the body temperature inside the ear; an ambient temperature sensor that periodically measures the ambient temperature; measurement result transmission means that transmits the measurement results of the body temperature inside the ear by the ear-type body temperature sensor and the measurement results of the ambient temperature by the ambient temperature sensor to the wireless terminal; and a warning means that, when a warning message is received from the wireless terminal during playback or output of the audio data, interrupts the output of the audio data or reduces the output volume and outputs the warning message.

[0011] In this invention, when the user's ear temperature and ambient temperature indicate a possible change in the user's physical condition while audio data is being played back and output by wireless earphones, the audio data output is interrupted or the output volume is reduced, and a warning message is displayed. This prevents the user from becoming so engrossed in listening to audio with wireless earphones that they fail to notice changes in their physical condition or neglect to check their physical condition. Furthermore, since this invention measures ear temperature using an ear-type thermometer, it can measure body temperature with higher accuracy compared to wristwatch-type wearable devices that measure body temperature on the arm, which are susceptible to external environmental influences such as ambient temperature and whose wearing state may change due to the user's exercise.

[0012] Therefore, according to the present invention, the user's biometric information can be measured with higher accuracy, and the user can be alerted to changes in their physical condition.

[0013] Figure 1 is a schematic diagram of a wireless audio system according to one embodiment of the present invention. Figures 2(A), 2(B), and 2(C) are a front view, side view, and rear view of the wireless earphone 1. Figure 3 is a schematic functional configuration diagram of the earphone body 10 of the wireless earphone 1. Figure 4 is a diagram illustrating the operation flow of the wireless earphone 1. Figure 5 is a schematic functional configuration diagram of the wireless terminal 2. Figure 6 is a schematic diagram showing an example of registered contents in the warning message / playback target information storage unit 204. Figure 7 is a flowchart illustrating the operation of the wireless terminal 2.

[0014] An embodiment of the present invention will be described below.

[0015] Figure 1 is a schematic diagram of the wireless audio system according to this embodiment.

[0016] As shown in the figure, the wireless audio system according to this embodiment comprises a pair of wireless earphones 1-1, 1-2 (hereinafter also simply referred to as wireless earphone 1) for the user to wear on both ears, and a wireless terminal 2 that functions as an audio device.

[0017] During use, the wireless earphone 1 is wirelessly connected to the wireless terminal 2 via short-range wireless communication such as Bluetooth®, and receives, plays, and outputs audio data transmitted from the wireless terminal 2. The wireless earphone 1 also periodically measures the body temperature inside the ear and the ambient temperature, and transmits the results to the wireless terminal 2. If a warning message is received from the wireless terminal 2 while audio data is being played or output, the output of the audio data is interrupted or the output volume is reduced and the warning message is output.

[0018] The wireless terminal 2 is connected to a network 4, such as a WAN (Wide Area Network) or LAN (Local Area Network), via a wireless connection with the access point 5. It accesses the media server 3 via the network 4, downloads the desired audio data from the media server 3, and transmits it to the wireless earphone 1. In addition, if the body temperature and ambient temperature measurement results received from the wireless earphone 1 indicate a possible change in the user's physical condition, the wireless terminal 2 sends a warning message to the wireless earphone 1 to alert the user.

[0019] Next, the details of the wireless earphones 1 and wireless terminal 2 that constitute the wireless audio system according to this embodiment will be described.

[0020] First, let me explain the details of wireless earphone 1.

[0021] Figures 2(A), 2(B), and 2(C) are the front, side, and rear views of the wireless earphone 1.

[0022] Wireless earphone 1 is a canal-type wireless earphone, and as shown in the figure, it is composed of a cylindrical earphone body 10 and an earpiece 14.

[0023] The earphone body 10 includes a cylindrical nozzle 11 provided on the front end surface 12A, an ambient temperature sensor 100 provided on the rear end surface 12B, and an ear-type body temperature sensor 101 that protrudes radially outward from the outer peripheral surface 13 of the nozzle 11.

[0024] The ambient temperature sensor 100 is exposed to the outside air while the wireless earphone 1 is worn in the ear and measures the ambient temperature. On the other hand, the ear-type body temperature sensor 101 is located inside the ear while the wireless earphone 1 is worn in the ear and measures the body temperature inside the ear. For example, the ear-type body temperature sensor 101 can utilize the technology of the ear thermometer described in Japanese Patent Application Publication No. 2005-224617.

[0025] The earpiece 14 is a part made of thermoplastic elastomer or the like, attached to cover the outer peripheral surface 13 of the tip of the nozzle 11. When the wireless earphone 1 is placed in the user's ear, the earpiece 14 deforms to seal the gap between the outer peripheral surface of the nozzle 11 and the inner wall surface of the ear canal. An opening 16 is provided on the outer peripheral surface 15 of the earpiece 14, and the ear-type body temperature sensor 101 on the outer peripheral surface 13 of the nozzle 11 is exposed to the outside through this opening 16. As a result, when the nozzle 11 surrounded by the earpiece 14 is inserted into the ear canal, the ear-type body temperature sensor 101 is exposed inside the ear.

[0026] Figure 3 is a schematic functional configuration diagram of the earphone body 10 of the wireless earphone 1.

[0027] As shown in the figure, in addition to the above-mentioned ambient temperature sensor 100 and ear-type body temperature sensor 101, the earphone body 10 further includes a short-range wireless communication unit 102, a playback unit 103, a driver unit 104, and a main control unit 105.

[0028] The short-range wireless communication unit 102 is an interface for wirelessly connecting to the wireless terminal 2 via short-range wireless communication such as Bluetooth®.

[0029] The playback unit 103 plays back audio data received from the wireless terminal 2 via the short-range wireless communication unit 102.

[0030] The driver unit 104 is a magnetic circuit equipped with a magnet, and in accordance with the playback signal of the audio data played back by the playback unit 103, it vibrates a diaphragm (not shown) located inside the nozzle 11 using electromagnetic force. As a result, audio is emitted from the nozzle 11.

[0031] The main control unit 105 then comprehensively controls each of the parts 100 to 104 of the earphone body 10.

[0032] The functional configuration of the earphone body 10 shown in Figure 3 is implemented in hardware using integrated logic ICs such as ASIC (Application Specific Integrated Circuit) and FPGA (Field Programmable Gate Array). Alternatively, the functional components 102 to 105 other than the ambient temperature sensor 100 and the ear-type body temperature sensor 101 are implemented in software using a computer such as a DSP (Digital Signal Processor) or microcomputer.

[0033] Figure 4 is a diagram illustrating the operation flow of the wireless earphone 1.

[0034] This process begins when the main control unit 105 receives audio data from the wireless terminal 2 via the short-range wireless communication unit 102.

[0035] First, the main control unit 105 passes the audio data received from the wireless terminal 2 to the playback unit 103 and instructs it to play and output the audio data. In response, the playback unit 103 starts playing the audio data and outputting the playback signal to the driver unit 104 (S100). Then, the driver unit 104 drives the diaphragm according to the playback signal of the audio data input from the playback unit 103 and emits audio from the nozzle 11.

[0036] Next, when the playback unit 103 is playing and outputting audio data, the main control unit 105 instructs the ambient temperature sensor 100 and the ear temperature sensor 101 to take measurements when a periodic measurement timing arrives (YES in S101). In response, the ambient temperature sensor 100 and the ear temperature sensor 101 measure the ambient temperature and the temperature inside the ear, and pass the measurement results to the main control unit 105. The main control unit 105 then transmits the ambient temperature and temperature measurement results received from the ambient temperature sensor 100 and the ear temperature sensor 101 to the wireless terminal 2 via the short-range wireless communication unit 102 (S103). The process then proceeds to S108.

[0037] Furthermore, if the main control unit 105 receives a warning message from the wireless terminal 2 via the short-range wireless communication unit 102 while the playback unit 103 is playing and outputting audio data (YES in S104), it controls the playback unit 103 to interrupt the output of the audio data playback signal to the driver unit 104 or reduce its output volume (S105). Then, the main control unit 105 passes the warning message to the playback unit 103 and instructs it to play and output the warning message. In response, the playback unit 103 plays the warning message and outputs its playback signal to the driver unit 104 (S106). The driver unit 104 then drives the diaphragm according to the playback signal of the warning message input from the playback unit 103 and emits the warning message from the nozzle 11. Then, the main control unit 105 controls the playback unit 103 to resume the output of the audio data playback signal to the driver unit 104 or restore its output volume to its original level (S107). After that, the process proceeds to S108.

[0038] In S108, the main control unit 105 returns to S101 if the audio data is being played back and output by the playback unit 103 (NO in S108), and terminates this flow if the playback and output of the audio data has finished (YES in S108).

[0039] Next, we will explain the details of wireless terminal 2.

[0040] Figure 5 is a schematic diagram of the functional configuration of the wireless terminal 2.

[0041] As shown in the figure, the wireless terminal 2 includes a short-range wireless communication unit 200, a wireless network interface unit 201, a man-machine interface unit 202, an audio data storage unit 203, an attention message / playback target information storage unit 204, a physical condition monitoring unit 205, and a main control unit 206.

[0042] The short-range wireless communication unit 200 is an interface for wirelessly connecting to the wireless earphone 1 through short-range wireless communication such as Bluetooth (registered trademark).

[0043] The wireless network interface unit 201 is an interface for wirelessly connecting to the access point 5.

[0044] The man-machine interface unit 202 is an interface for presenting information to the user and receiving various operations from the user, and includes input / output devices such as a microphone, a speaker, and a display panel with a touch sensor.

[0045] The audio data storage unit 203 stores audio data downloaded from the media server 3 via the wireless network interface unit 201.

[0046] The attention message / playback target information storage unit 204 stores, for each type of physical condition abnormality and symptoms that require attention, the attention message and, if necessary, the identification information of the playback target (music, sound source) associated with the conditions of the outside temperature and body temperature.

[0047] Figure 6 is a diagram schematically showing an example of the registered contents of the attention message / playback target information storage unit 204.

[0048] As shown in the figure, in the warning message and playback target information storage unit 204, record 2040 of the warning message is stored for each type of physical condition abnormality and symptom to be noted. The record 2040 of the warning message has a field 2041 in which the outside air temperature condition is registered, a field 2042 in which the body temperature condition is registered, a field 2043 in which the type of target (warning type) to be vigilant in a situation corresponding to the outside air temperature and body temperature conditions registered in fields 2041 and 2042 is registered, a field 2044 in which the warning message for the warning type registered in field 2043 is registered, and a field 2045 in which the identification information of the playback target when the outside air temperature and body temperature conditions registered in fields 2041 and 2042 are satisfied is registered.

[0049] In the present embodiment, for example, "heat stroke" is registered as the type of target to be vigilant in a situation where the outside air temperature is 30 degrees or more and the user's body temperature is high fever (37.5 degrees or more), and "cold or the like" is registered as the type of target to be vigilant in a situation where the outside air temperature is less than 30 degrees and the user's body temperature is high (37.5 degrees or more). "Increased risk of heat stroke" is registered as the type of target to be vigilant in a situation where the outside air temperature is less than 30 degrees and the user's body temperature is normal or slightly feverish (less than 37.5 degrees). In addition, as the playback target when in a situation where the onset of heat stroke should be warned, environmental sounds that can give a sense of coolness, such as the sound of a river stream and the sound of plants swaying in the breeze, are registered. As the playback target when in a situation where the onset of cold or the like should be warned, music that can relax the user, such as slow-tempo classical music, is registered. Note that these registered information are examples, and different numerical ranges may be registered as the outside air temperature and the user's body temperature conditions, or types of targets other than the above (such as hypothermia) may be registered as the targets to be vigilant. Also, music or the like other than the above may be registered as the playback target.

[0050] Then, the main control unit 206 comprehensively controls each part 200 to 205 of the wireless terminal 2.

[0051] The functional configuration of the wireless terminal 2 shown in Figure 5 is realized as a process in a mobile terminal such as a smartphone or tablet PC (Personal Computer) equipped with a CPU (Central Processing Unit), memory, auxiliary storage device such as flash memory, wireless LAN communication device, and short-range wireless communication device such as Bluetooth®. The CPU loads a predetermined program from the auxiliary storage device into memory and executes it.

[0052] Figure 7 is a flowchart illustrating the operation of the wireless terminal 2.

[0053] This flow begins when the main control unit 206 receives a playback instruction for audio data, along with the specification of the song title to be played, from the user via the human-machine interface unit 202.

[0054] First, the main control unit 206 accesses the media server 3 via the wireless network interface unit 201 and downloads the audio data of the song specified by the user's playback command from the media server 3 and stores it in the audio data storage unit 203 (S200). Then, the main control unit 206 starts transmitting the audio data stored in the audio data storage unit 203 to the pair of wireless earphones 1-1 and 1-2 via the short-range wireless communication unit 200 (S201).

[0055] Next, the main control unit 206 receives the measurement results of the ambient temperature and the user's body temperature from each of the pair of wireless earphones 1-1 and 1-2 via the short-range wireless communication unit 200 (YES in S202), and passes these measurement results to the health monitoring unit 205. In response, the health monitoring unit 205 calculates the average value of the measurement results from the wireless earphones 1-1 and 1-2 for both the ambient temperature and body temperature (S203). Then, it searches the warning message / playback target information storage unit 204 for a warning message record 2040 in which the average value of the ambient temperature measurement results satisfies the ambient temperature conditions of field 2041, and the average value of the body temperature measurement results satisfies the body temperature conditions of field 2042 (S204).

[0056] Next, if the health monitoring unit 205 finds that the record 2040 of the relevant warning message is not stored in the warning message / playback target information storage unit 204 (NO in S205), it notifies the main control unit 206 of this fact and proceeds to S210.

[0057] Meanwhile, if the health monitoring unit 205 finds that the record 2040 of the relevant warning message is stored in the warning message / playback target information storage unit 204 (YES in S205), it displays the target type registered in field 2043 and / or the warning message registered in field 2044 of the record 2040 on the man-machine interface unit 202, and also transmits the warning message to the pair of wireless earphones 1-1 and 1-2 via the short-range wireless communication unit 200 (S206).

[0058] Furthermore, the health monitoring unit 205 determines whether or not the identification information of the playback target is registered in field 2045 of record 2040 (S207). If the identification information of the playback target is not registered (NO in S207), the process proceeds to S210. If the identification information of the playback target is registered (YES in S207), the identification information of this playback target is notified to the main control unit 206. In response, the main control unit 206 downloads the playback target identified by the notified identification information from the media server 3 via the wireless network interface unit 201 and stores it in the audio data storage unit 203 (S208). Then, the main control unit 206 changes the audio data to be transmitted to the pair of wireless earphones 1-1 and 1-2 from the audio data being transmitted to the playback target stored in the audio data storage unit 203 (S209). After that, the process proceeds to S210.

[0059] In S210, the main control unit 206 returns to S202 if the transmission of audio data or playback target to the pair of wireless earphones 1-1 and 1-2 has not been completed (NO in S210), and terminates this flow if it has been completed (YES in S210).

[0060] One embodiment of the present invention has been described above.

[0061] In this embodiment, when the wireless earphone 1 is playing or outputting audio data, if the temperature inside the ear and the ambient temperature indicate a possible change in the user's physical condition, the audio data output is interrupted or the output volume is reduced, and a warning message is output from the wireless earphone 1 to alert the user. Therefore, even if the user becomes engrossed in listening to audio using the wireless earphone 1, the warning message output from the wireless earphone 1 will make the user aware of any changes in their physical condition. Furthermore, in this embodiment, since the temperature inside the ear is measured by the ear-type temperature sensor 101, it is possible to measure the temperature with higher accuracy compared to a wristwatch-type wearable device that measures temperature on the arm, which is susceptible to external environmental influences such as ambient temperature and whose wearing state may change due to the user's daily activities.

[0062] Therefore, according to this embodiment, the body temperature of a user listening to audio with wireless earphones can be measured with higher accuracy, and the user can be alerted to any changes in their physical condition.

[0063] Furthermore, in this embodiment, the wireless earphone 1 is equipped with an ambient temperature sensor 100 to more accurately measure the ambient temperature around the user. This allows for improved accuracy in determining whether there is a possibility of a change in the user's physical condition by considering not only the user's body temperature but also the ambient temperature.

[0064] Furthermore, in this embodiment, the average value of the body temperature measurements taken in both ears by a pair of wireless earphones 1-1 and 1-2 worn on both ears is used, so the user's body temperature can be grasped more accurately, and as a result, changes in the user's physical condition can be detected more accurately.

[0065] Furthermore, in this embodiment, the wireless terminal 2 stores identification information for playback targets in advance, linked to combinations of ambient temperature and body temperature conditions. If the body temperature inside the ear and ambient temperature obtained from the wireless terminal 2 while transmitting audio data to the wireless earphone 1 satisfy any combination of ambient temperature and body temperature conditions, the wireless terminal 2 transmits the playback target identified by the identification information stored in conjunction with this combination to the wireless earphone 1 instead of the audio data being transmitted. Therefore, if the measurement results indicate a possible change in the user's physical condition, audio data appropriate to that situation can be played and output from the wireless earphone 1. For example, if there is a risk of heatstroke, audio data of ambient sounds that provide a sense of coolness can be played and output, or if there is a risk of catching a cold or the like, audio data of music that can help the user relax can be played and output.

[0066] It should be noted that the present invention is not limited to the embodiments described above, and numerous modifications are possible within the scope of its essence.

[0067] For example, in the above embodiment, the outside temperature sensor 100 is provided on the wireless earphone 1 to measure the outside temperature. However, the present invention is not limited to this. The outside temperature sensor may be provided on the wireless terminal 2 to measure the outside temperature, or environmental sensors other than the outside temperature sensor may be provided on the wireless earphone 1 or wireless terminal 2 to measure information other than the outside temperature related to the environment (humidity, atmospheric pressure, etc.) as information used to detect changes in the user's physical condition. Alternatively, the wireless terminal 2 may be provided with a current location measurement function such as GPS (Global Positioning System), and the area including the current location measured by this function may be identified as the current location area. The system may then access a web server that provides weather information services connected to the network 4 via the access point 5 and obtain the outside temperature of the current location area from this web server.

[0068] Furthermore, in the above embodiment, the wireless earphone 1 may be equipped with a biometric information sensor that acquires biometric information other than body temperature (such as brain waves and blood pressure) from inside the ear, in addition to the ear-type body temperature sensor 101, and the presence or absence of changes in the user's physical condition may be determined using body temperature and other biometric information along with the ambient temperature. By doing so, changes in the user's physical condition can be predicted more accurately.

[0069] Furthermore, in this embodiment, the ear-type body temperature sensor 101 is provided on the outer peripheral surface 13 of the nozzle 11, but the ear-type body temperature sensor 101 may be provided at another position that can be exposed from the earpiece 14. The ear-type body temperature sensor 101 may also be positioned facing the eardrum, provided that space can be secured so as not to block the nozzle.

[0070] 1, 1-1, 1-2: Wireless earphones 2: Wireless terminal 3: Media server 4: Network 5: Access point 10: Earphone body 11: Nozzle 12A: Front end surface of earphone body 10 12B: Rear end surface of earphone body 10 13: Outer surface of nozzle 11 14: Earpiece 15: Outer surface of earpiece 14 16: Opening of earpiece 14 100: Ambient temperature sensor 101: Ear-type body temperature sensor 102: Short-range wireless communication unit 103: Playback unit 104: Driver unit 105: Main control unit 200: Short-range wireless communication unit 201: Wireless network interface unit 202: Human-machine interface unit 203: Audio data storage unit 204: Warning message / playback target information storage unit 205: Health monitoring unit 206: Main control unit

Claims

1. A wireless audio system comprising a wireless terminal that functions as an audio device, and a wireless earphone that receives, plays, and outputs audio data transmitted from the wireless terminal, wherein the wireless earphone includes an ear-type body temperature sensor that periodically measures the body temperature inside the ear, a measurement result transmission means that transmits the measurement result of the body temperature inside the ear by the ear-type body temperature sensor to the wireless terminal, and a warning means that, when a warning message is received from the wireless terminal during playback or output of the audio data, interrupts the output of the audio data or reduces the output volume and outputs the warning message, wherein the wireless terminal includes an outside temperature acquisition means that periodically acquires the outside temperature, a body temperature receiving means that receives the measurement result of the body temperature from the wireless earphone, and a warning message transmission means that, when the measurement result of the outside temperature acquired by the outside temperature acquisition means and the body temperature received by the body temperature receiving means indicate a possible change in the user's physical condition, sends a warning message to the wireless earphone to that effect.

2. A wireless audio system according to claim 1, wherein the wireless terminal further comprises an ambient temperature sensor for measuring ambient temperature, and the ambient temperature acquisition means periodically acquires the ambient temperature measured by the ambient temperature sensor.

3. A wireless audio system according to claim 1, wherein the wireless terminal further comprises a current location area identification means for identifying a current location area which is an area including the current location of the wireless terminal, and the outside temperature acquisition means acquires the outside temperature of the current location area identified by the current location area identification means from a Web server that provides weather information services.

4. A wireless audio system according to claim 1, wherein the wireless earphone further comprises an ambient temperature sensor that periodically measures ambient temperature, the measurement result transmission means transmits the measurement result of the temperature inside the ear by the ear-type temperature sensor to the wireless terminal together with the measurement result of the ambient temperature by the ambient temperature sensor, and the ambient temperature acquisition means acquires the measurement result of the ambient temperature transmitted from the wireless terminal together with the measurement result of the temperature.

5. A wireless audio system according to claim 1, comprising a pair of wireless earphones for wearing on both ears, wherein the body temperature receiving means receives the results of body temperature measurement from the pair of wireless earphones, and the warning message transmitting means transmits the warning message to the wireless earphones when the average value of the ambient temperature obtained by the ambient temperature acquisition means and the average value of the body temperature measurement results received from the pair of wireless earphones by the body temperature receiving means indicates a possible change in the user's physical condition.

6. A wireless audio system according to any one of claims 1 to 5, wherein the wireless terminal further comprises: a playback target storage means that stores identification information of a playback target linked to a combination of ambient temperature and body temperature conditions; and a playback target changing means that, when the measurement results of ambient temperature acquired by the ambient temperature acquisition means and body temperature received by the body temperature receiving means satisfy the combination of ambient temperature and body temperature conditions, transmits audio data of a playback target, specified by the identification information stored in the playback target storage means linked to the combination, to the wireless earphone in place of the audio data currently being transmitted to the wireless earphone.

7. Wireless earphones that receive, play, and output audio data transmitted from a wireless terminal functioning as an audio device, comprising: an ear-type body temperature sensor that periodically measures the body temperature inside the ear; an ambient temperature sensor that periodically measures the ambient temperature; measurement result transmission means for transmitting the measurement results of the body temperature inside the ear by the ear-type body temperature sensor and the ambient temperature measurement results by the ambient temperature sensor to the wireless terminal; and a warning means that, when a warning message is received from the wireless terminal during playback or output of the audio data, interrupts the output of the audio data or reduces the output volume and outputs the warning message.

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