JP6097552B2 - Audio playback device - Google Patents

Description

  The present invention relates to an audio reproduction device, and more particularly to an improvement of an audio reproduction device that reproduces audio content.

  Some audio playback apparatuses download and reproduce audio news that conveys the contents of news programs and audio books that convey the contents of books from a server device on a communication network such as the Internet. Audio content such as downloaded audio news and audio books is stored in the memory, and when the audio content is played back, if the surrounding noise becomes loud and there is an oversight, the user can perform a predetermined operation to play the audio content. Can be rewound arbitrarily.

  However, there is a problem that it is complicated to perform the rewinding operation every time the surrounding noise increases and it becomes difficult to hear. In particular, when carrying an audio playback device and listening to audio content while jogging or walking, there is a problem that it is extremely troublesome to stop and operate the audio playback device.

  Therefore, an audio playback device that detects the noise level, pauses the playback of the audio content if the noise level exceeds a certain value, and automatically resumes the playback of the audio content if the noise level falls below the certain value after that. Has been proposed (for example, Patent Document 1). In this patent document 1, when resuming the reproduction of audio content, it is described that the reproduction position is rewound for a certain period of time, the volume is set to a silence level position, or the position is specified in advance by the user. ing.

JP 2006-295669 A JP 2012-58355 A

  In the conventional audio reproduction apparatus as described above, the reproduction position is rewound regardless of the period in which the reproduction is paused due to an increase in the noise level. That is, rewinding is performed for a predetermined time, or rewinding is performed to a predetermined playback position. For this reason, when the pause period is short, the rewinding becomes redundant. On the other hand, when the pause period is long, the rewinding is insufficient. In particular, if the stop period is long, the contents before the temporary stop may be forgotten, and if the rewind is insufficient, it is necessary to rewind again, which is inconvenient.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an audio reproduction device that can automatically rewind the reproduction position in accordance with the hearing loss period due to an increase in noise level. In particular, an audio reproduction device capable of suppressing rewinding from becoming redundant when the hearing loss period is short and suppressing rewinding from becoming insufficient when the hearing loss period is long. The purpose is to provide.

  An audio reproduction apparatus according to the present invention includes audio content storage means for holding audio content, reproduction control means for reproducing the audio content, and noise detection means for detecting a noise level, wherein the reproduction control means includes the noise. Noise increase position storage means for storing the reproduction position of the audio content when the level exceeds the first threshold as a noise increase position, and a time from when the noise level exceeds the first threshold to when it falls below the second threshold Deafness period measuring means for measuring the deafness period, rewind time determining means for determining a rewind time based on the deafness period, and reproduction of the audio content from the noise increasing position at the end of the deafness period. Rewinding reproduction means for rewinding to a position back by the rewind time is configured.

  According to such a configuration, since the audio content is held and the reproduction position at the time when the noise level exceeds the first threshold is stored as the noise increase position, it is possible to rewind from the noise increase position as a starting point. In addition, the rewind time at the time of rewind playback is determined based on the hearing loss period, and at the end of the hearing loss period, the playback of the audio content is rewound from the noise increase position to a position that is back by the rewind time, so that the noise level increases. The playback position can be automatically rewound according to the hearing loss period.

  In the audio reproduction apparatus according to the present invention, the reproduction position can be automatically rewound according to the deafness period due to the increase in the noise level. In particular, the longer the deafness period, the longer the rewind time, so that when the deafness period is short, it is possible to prevent the rewinding from becoming redundant, and when the deafness period is long, the rewinding is not effective. It can suppress becoming sufficient.

It is the perspective view which showed one structural example of the audio | voice reproduction apparatus 1 by embodiment of this invention. It is the block diagram which showed an example of the function structure in the audio | voice reproduction apparatus 1 of FIG. FIG. 3 is a diagram illustrating an example of the operation of the audio reproduction device 1 of FIG. 2, in which two reproduction controls A and B having different correspondences between a temporal change in noise level and a hearing loss period TN are illustrated. FIG. 3 is a diagram illustrating an example of the operation of the audio reproduction device 1 of FIG. 2, and shows a correspondence relationship between reference positions Tcb1 and Tcb2 and start positions Tcs1 and Tcs2. FIG. 3 is a block diagram illustrating a configuration example of a main control unit 20 in FIG. 2. 6 is a flowchart showing an example of an operation during reproduction of audio content in the main control unit 20 of FIG. 5. 6 is a flowchart showing an example of an operation during reproduction of audio content in the main control unit 20 of FIG. 5.

<Audio playback device 1>
FIG. 1 is a perspective view showing a configuration example of an audio reproducing device 1 according to an embodiment of the present invention. This audio reproduction device 1 is a mobile phone that can make a call using a mobile communication network, and includes a touch panel 11, a speaker 12 for reception, a microphone 13 for transmission, and operation keys 14a to 14c. A terminal main body 10 and a headphone 15 including a microphone 16 for noise detection are included.

  The terminal body 10 has a thin and vertically long rectangular parallelepiped shape, and the touch panel 11, the speaker 12, the microphone 13, and the operation keys 14a to 14c are arranged on the front surface of the casing. The speaker 12 is disposed at one end in the longitudinal direction of the terminal body 10, and the microphone 13 and the operation keys 14 a to 14 c are disposed at the other end.

  The touch panel 11 includes a display device having a display screen and an operation input device that detects a touch operation on the display screen. The speaker 12 is a sound output device for outputting a received sound. The microphone 13 is a voice input device for inputting a transmission sound. The operation keys 14a to 14c are physical keys to which various functions are assigned in advance, and the assigned function is executed by a user's pressing operation. For example, the operation key 14a is a return key for returning to the previous screen. The operation key 14b is a home key for displaying a home screen. The operation key 14c is a menu key for displaying a menu screen.

  The headphone 15 is an audio output device used when reproducing audio content, and converts an audio signal output from the terminal body 10 into an audible sound using a speaker. This headphone 15 is a stereo type headphone that applies two speakers to both ears of the user, and is detachably connected to the terminal body 10 via a transmission cable.

  The microphone 16 is a voice input device for detecting the noise level, and can detect the sound pressure level of noise in the vicinity of the headphones 15. Note that the connection between the terminal body 10 and the headphones 15 may use short-range wireless communication.

  The audio reproduction device 1 holds various audio contents such as audio news and audio books, and performs a predetermined operation to select one of the audio contents as a reproduction target and start reproduction of the audio content. Alternatively, the reproduction can be terminated.

  FIG. 2 is a block diagram showing an example of a functional configuration in the audio reproduction device 1 of FIG. This audio reproduction device 1 includes a touch panel 11, a speaker 12, microphones 13 and 16, headphones 15, a main control unit 20, a cellular communication unit 21, an operation unit 22, an audio input unit 23, an acceleration sensor 24, a display control unit 25, an audio An output unit 26, a memory 27, and a noise detection unit 28 are included.

  The main control unit 20 performs call processing and audio content playback control. The cellular communication unit 21 is a signal processing unit for communicating with an external device via a cellular base station and performing a call with a communication partner. The operation unit 22 receives a touch operation on the touch panel 11 and a pressing operation of the operation keys 14a to 14c, and generates an operation signal. The audio input unit 23 amplifies the audio signal collected by the microphone 13, converts it into digital data, and outputs the digital data to the main control unit 20.

  The display control unit 25 controls the touch panel 11 to display a home screen, a menu screen, a screen for playing audio content, and the like. The audio output unit 26 converts the audio data output from the main control unit 20 into an analog signal, generates a drive signal, and outputs the drive signal to the speaker 12 or the headphones 15.

  The memory 27 holds control programs and audio contents. For example, audio content downloaded from a server device on the Internet is stored in the memory 27. The audio content is composed of a large number of audio data in which the reading order and bit rate at the time of reproduction are defined, and is stored as an audio file compressed in a predetermined format. The noise detection unit 28 detects the noise level based on the audio signal collected by the microphone 16 and outputs the detection result to the main control unit 20.

  The acceleration sensor 24 is a detection device that detects acceleration and outputs the detection result to the main control unit 20, and is used to determine whether or not the user is in a stationary state. For example, a capacitance type sensor that detects a change in position of the movable part by a change in capacitance is used as the acceleration sensor 24.

  In the audio reproduction device 1, reproduction control for temporarily stopping reproduction of audio content is performed when the noise level exceeds the first threshold Lb and the magnitude of acceleration is equal to or less than a predetermined determination threshold Th. In addition, the time from when the noise level exceeds the first threshold value Lb to when it falls below the second threshold value Ls (Ls ≦ Lb) is measured as the deafness period TN, and at the end of the deafness period TN, the reproduction of audio content increases noise. Rewind playback is performed to rewind before the current playback position. This rewind reproduction is executed when the noise level falls below the second threshold value Ls, regardless of whether or not it is temporarily stopped. The second threshold Ls may be the same as the first threshold Lb.

<Hearing loss period TN>
FIG. 3 is a diagram showing an example of the operation of the audio reproduction device 1 of FIG. 2, and the two reproduction controls A, A, in which the horizontal axis represents the elapsed time t and the correspondence between the temporal change in the noise level and the deafness period TN is different. B is shown. In this figure, the case of Ls <Lb is shown. Noise level is above a first threshold value Lb at time _{t b,} then, it is below a second threshold value Ls at time _{t s.}

Hearing loss period TN, even though continued reproduction of the audio content, a time period which is less likely to hear the content of the audio content by the influence of the noise is obtained by _{TN = (t s -t b)} . The reproduction controls A and B are shown in association with the content time Tc. The content time Tc is a relative position on the time axis with the beginning of the audio content as the lower limit and the end as the upper limit.

The reproduction control A pauses the reproduction of the audio content at the start time of the hearing loss period TN, that is, when the noise level exceeds the first threshold value Lb (time t _b ), and ends at the end of the hearing loss period TN, that is, when the noise level is below the second threshold value Ls (time t _s), restarts reproduction of the audio content.

  The reproduction position Tcb at the time when the noise level exceeds the first threshold Lb is recorded as the noise increase position. When the reproduction of the audio content is resumed, the reproduction is started with the position (Tcb−α) that is a predetermined rewind time α (α ≧ 0) from the reproduction position Tcb as the start position Tcs. In this case, the starting point of rewinding is the reproduction position Tcb. The rewinding time α is determined according to the length of the hearing loss period TN.

  On the other hand, the reproduction control B continues to reproduce the audio content even during the deafness period TN, and at the end of the deafness period TN, the position where the audio content reproduction position (Tcb + TN) is traced back from the reproduction position Tcb by the rewind time α. Rewind to (Tcb-α). That is, when the noise level falls below the second threshold Ls, the sound content is rewound by time (TN + α), and playback of the audio content is started with the position (Tcb−α) as the start position Tcs. In this case, the starting point of rewinding is the reproduction position (Tcb + TN).

<Reference positions Tcb1, Tcb2 and start positions Tcs1, Tcs2>
FIG. 4 is a diagram illustrating an example of the operation of the audio reproduction device 1 of FIG. 2, and the reference position Tcb1 and start position Tcs1 in the previous rewind reproduction, and the reference position Tcb2 and start position Tcs2 in the current rewind reproduction. Correspondence with is shown. In this figure, the horizontal axis is the content time Tc, and the case where reproduction is temporarily stopped at the noise increase positions (Tcb1, Tcb2) is shown.

  In the figure, (a) shows the case of α2 <(Tcb2-Tcs1), and (b) shows the case of α2 ≧ (Tcb2-Tcs1). The reference position Tcb1 is a noise increasing position at the time of the previous reproduction, and is rewound for the rewind time α1 with the reference position as a starting point. That is, the current reproduction is started from the start position Tcs1 = (Tcb1-α1) of the previous rewind reproduction. The rewind time α1 is determined according to the length of the deafness period TN at the time of the previous rewind reproduction.

  The reference position Tcb2 is a noise increasing position at the time of the current reproduction, and is rewound for the rewinding time α2 starting from this reference position. In the case of α2 <(Tcb2-Tcs1), the start position Tcs2 = (Tcb2-α2) in the current rewind playback, which is a playback position after the start position Tcs1 of the previous rewind playback.

  On the other hand, in the case of α2 ≧ (Tcb2-Tcs1), if the playback position (Tcb2-α2) is set to the start position Tcs2 of the current rewind playback, the process goes back to the start position Tcs1 of the previous rewind playback. Will end up. Therefore, in such a case, playback control is performed in which the start position Tcs1 of the previous rewind playback is set as the lower limit of the start position Tcs2 in the current rewind playback. That is, it does not rewind back before the previous rewind playback start position Tcs1, and the start position Tcs2 in this rewind playback is Tcs2 = Tcs1.

  Here, when Tcb2 <Tcb1, the content of the content after the reference position Tcb1 that has not been reproduced in the previous reproduction is not listened to in this reproduction, and the current rewind reproduction (next reproduction) occurs. . In such a case, in the present embodiment, playback control is performed in which the start position Tcs1 of the previous rewind playback is set as the lower limit of the start position Tcs2 in the current rewind playback.

  On the other hand, in the case of Tcb1 ≦ Tcb2, a part of the content content after the reference position Tcb1 that has not been reproduced in the previous reproduction, that is, the part from the reproduction position Tcb1 to the reproduction position Tcb2 is heard in the current reproduction. It will be. In such a case, in the present embodiment, the rewinding time α2 is determined according to the length of the hearing loss period TN without particularly setting a lower limit.

<Main control unit 20>
FIG. 5 is a block diagram showing a configuration example of the main control unit 20 of FIG. The main control unit 20 includes a stillness determination unit 101, a noise increase determination unit 102, a temporary stop unit 103, a noise increase position storage unit 104, a noise reduction determination unit 105, a hearing loss period measurement unit 106, a rewind time determination unit 107, a winding time. The playback unit 108 and the decoding unit 109 are configured.

  The decoding unit 109 reads and decodes audio content from the memory 27, generates audio data for reproduction from the headphones 15, and outputs the audio data to the audio output unit 26. The decoding unit 109 starts playback of the audio content based on the playback instruction from the operation unit 22, and ends the playback of the audio content based on the end instruction.

  The stillness determination unit 101 determines whether or not the user is in a still state based on the output of the acceleration sensor 24, and outputs the determination result to the temporary stop unit 103. Whether or not the vehicle is in a stationary state is determined by comparing the magnitude of acceleration with a determination threshold Th.

  The noise increase determination unit 102 compares the noise level detected by the noise detection unit 28 with the first threshold value Lb, and determines whether the noise level exceeds the first threshold value Lb based on the comparison result, The determination result is output to the pause unit 103 and the deafness period measurement unit 106.

  The pause unit 103 pauses the reproduction of the audio content based on the comparison result obtained by comparing the noise level with the first threshold value Lb and the comparison result obtained by comparing the magnitude of acceleration with the determination threshold value Th. Specifically, when the noise level exceeds the first threshold value Lb, if the magnitude of the acceleration is equal to or less than the determination threshold value Th, the decoding unit 109 is controlled to pause the reproduction.

  In the noise increase position storage unit 104, the reproduction position of the audio content when the noise level exceeds the first threshold Lb is stored as the noise increase position (reference position Tcb). The noise reduction determination unit 105 compares the noise level detected by the noise detection unit 28 with the second threshold Ls, determines whether the noise level is below the second threshold Ls based on the comparison result, The determination result is output to the hearing loss period measurement unit 106 and the rewind playback unit 108.

  The deafness period measurement unit 106 measures the time from when the noise level exceeds the first threshold value Lb to when it falls below the second threshold value Ls as the deafness period TN. The rewind time determination unit 107 determines the rewind time α based on the hearing loss period TN. The rewind time determination unit 107 increases the rewind time α as the deafness period TN is longer.

  At the end of the deafness period TN, the rewind playback unit 108 controls the decoding unit 109 to perform rewind playback that rewinds the playback of the audio content from the reference position Tcb to a position that is back by the rewind time α. When Tcb2 <Tcb1, the rewind playback unit 108 sets the start position Tcs1 of the previous rewind playback as the lower limit of the start position Tcs2 in the current rewind playback.

  Steps S101 to S121 in FIGS. 6 and 7 are flowcharts showing an example of the operation at the time of reproduction of audio content in the main control unit 20 in FIG. First, when the operation unit 22 receives a reproduction instruction, the main control unit 20 initializes various parameters and starts reproduction of audio content (steps S101 and S102).

For example, to reset the time data _t b, _{t s,} the reference position TCB1, TCB2 and start position TCS1, TCS2 an initial value Tc0. The reproduction of the audio content is started with the initial value Tc0 as the start position. This initial value Tc0 may be the beginning of the audio content, or may be the playback position at the previous end instruction.

Next, the main control unit 20 confirms the noise level, and if the noise level exceeds the first threshold value Lb (steps S103 and S104), the main control unit 20 records the reproduction position at that time as the reference position Tcb2 and the current time. recording a t as the time _{t b} (step S105). Then, the main control unit 20 confirms the acceleration, and if the user is in a stationary state (steps S106 and S107), the main control unit 20 pauses the reproduction of the audio content (step S108).

The main control unit 20 checks the noise level, if the noise level falls below the second threshold value Ls (step S109, S110), currently recording time t as the time _{t s} (step S111). The main control unit 20 calculates the hearing loss period TN from the time _t b, _{t s,} to determine the rewind time α in accordance with the hearing loss period TN (step S112, S113).

  For example, when the hearing loss period TN is less than 1 second, α = 2 seconds, when 1 ≦ TN <10, α = TN × 2 seconds, and when the hearing loss period TN is 10 seconds or more, α = 20 seconds.

  Next, when the reference position Tcb2 satisfies Tcb2 ≧ Tcb1, the main control unit 20 initializes the start position Tcs1 in the previous rewind reproduction (steps S114 and S115). That is, the main control unit 20 sets the start position Tcs1 to Tcs1 = 0.

  Next, when the playback position (Tcb2-α) satisfies (Tcb2-α) ≧ Tcs1, the main control unit 20 sets the playback position (Tcb2-α) as the start position Tcs2 in the current rewind playback (step S2). S116, S117). On the other hand, when the playback position (Tcb2-α) does not satisfy (Tcb2-α) ≧ Tcs1, the main control unit 20 sets the start position Tcs1 of the previous rewind playback as the start position Tcs2 in the current rewind playback ( Steps S116 and S121).

  Next, the main control unit 20 updates the start position Tcs1 and the reference position Tcb1, and executes rewind reproduction (steps S118 and S119). The processing procedure from step S103 to step S119 is repeated until an end instruction is accepted in the operation unit 22, and if the end instruction is accepted, the reproduction of the audio content is terminated and this process is terminated (step S120).

  According to the present embodiment, since the audio content is held and the reproduction position at the time when the noise level exceeds the first threshold value Lb is stored as the noise increase position (reference position Tcb), rewinding is started from the noise increase position as a starting point. be able to. In addition, the rewind time α at the time of rewind playback is determined based on the deafness period TN, and at the end of the deafness period TN, the reproduction of the audio content is rewound from the noise increase position to a position that is back by the rewind time α. The playback position can be automatically rewound according to the deafness period TN due to the increase in level.

  In particular, when the deafness period TN is short, rewinding can be suppressed from becoming redundant, and when the deafness period TN is long, rewinding can be suppressed from becoming insufficient. In addition, since the start position Tcs1 of the previous rewind reproduction is set as the lower limit of the start position Tcs2 in the current rewind reproduction, the rewind reproduction start is started when the reproduction pause due to the increase in noise is repeated at short time intervals. It is possible to prevent the position Tcs from going back infinitely.

  In the present embodiment, an example in which the audio playback device 1 is a mobile phone has been described. However, the present invention is not limited to such a mobile communication terminal, but may be a tablet terminal, a PDA (Personal Digital Assistants), or the like. It is suitable for a portable information terminal or a portable audio player. The present invention can also be applied to a stationary audio reproduction device.

  Further, in the present embodiment, when the reproduction of the audio content is paused based on the comparison result of comparing the noise level with the first threshold value Lb and the comparison result of comparing the magnitude of acceleration with the determination threshold value Th. Although an example has been described, the present invention does not limit the condition for temporary suspension. For example, the configuration may be such that when the noise level exceeds the first threshold Lb, the reproduction is paused regardless of the magnitude of the acceleration. Further, such a configuration may be adopted that the reproduction of the audio content is continued during the deafness period TN without performing the pause reproduction control.

  In the present embodiment, an example has been described in which if Tcb2 <Tcb1, the start position Tcs1 of the previous rewind playback is set as the lower limit of the start position Tcs2 in the current rewind playback. Regardless of whether or not Tcb2 <Tcb1, the configuration may be such that the start position Tcs1 of the previous rewind playback is set as the lower limit of the start position Tcs2 in the current rewind playback.

The configuration of the sound reproducing device according to the embodiment of the present invention and the corresponding operational effects are organized and summarized below.
The audio reproduction apparatus according to the first aspect of the present invention includes a memory 27 that holds audio content, a main control unit 20 that reproduces audio content, and a noise detection unit 28 that detects a noise level. The noise increase position storage unit 104 that stores the reproduction position of the audio content when the noise level exceeds the first threshold Th1 as the noise increase position Tc1, and the second threshold Th2 from when the noise level exceeds the first threshold Th1. The deafness period measurement unit 106 that measures the time until the deafness period TN, the rewind time determination unit 107 that determines the rewind time α based on the deafness period TN, and at the end of the deafness period TN, A rewinding reproduction unit 108 that rewinds the reproduction to a position that is back from the noise increase position Tc1 by the rewinding time α is configured.

  According to such a configuration, since the audio content is held and the reproduction position at the time when the noise level exceeds the first threshold Lb is stored as the noise increase position, it is possible to rewind from the noise increase position as a starting point. In addition, the rewind time α at the time of rewind playback is determined based on the deafness period TN, and at the end of the deafness period TN, the reproduction of the audio content is rewound from the noise increase position to a position that is back by the rewind time α. The playback position can be automatically rewound according to the deafness period TN due to the increase in level.

  In addition to the above configuration, the audio playback device according to the second aspect of the present invention is configured such that the rewind time determination unit 107 increases the rewind time α as the deafness period TN increases. According to such a configuration, it is possible to prevent rewinding from becoming redundant when the hearing loss period TN is short, and to prevent rewinding from being insufficient when the hearing loss period TN is long. can do.

  In addition to the above configuration, the audio playback device according to the third aspect of the present invention is configured such that the rewind playback unit 108 sets the start position Tcs1 of the previous rewind playback as the lower limit of the start position Tcs2 in the current rewind playback. The According to such a configuration, it is possible to prevent the rewind reproduction start position Tcs from going back infinitely when the reproduction pause due to noise increase is repeated at short time intervals.

  In addition to the above-described configuration, the audio playback device according to the fourth aspect of the present invention includes a pause unit 103 that causes the main control unit 20 to pause the playback of audio content based on a comparison result obtained by comparing the noise level with the first threshold value Lb. It is comprised so that it may have. According to such a configuration, reproduction of audio content can be automatically paused in response to an increase in noise level.

  In addition to the above configuration, the sound reproducing device according to the fifth aspect of the present invention includes an acceleration sensor 24 that detects acceleration, and the temporary stop unit 103 compares the noise level with the first threshold value Lb and the magnitude of the acceleration. Based on the comparison result obtained by comparing the value with the determination threshold Th, the reproduction of the audio content is paused. According to such a configuration, reproduction of audio content can be automatically paused according to an increase in noise level and the magnitude of acceleration.

DESCRIPTION OF SYMBOLS 1 Audio | voice reproduction apparatus 10 Terminal main body 11 Touch panel 12 Speaker 13 for receiving transmission Microphone 14a-14c for transmitting operation key 15 Headphone 16 Microphone 20 for noise detection Main control part 21 Cellular communication part 22 Operation part 23 Voice input part 24 Acceleration Sensor 25 Display control unit 26 Audio output unit 27 Memory 28 Noise detection unit 101 Stillness determination unit 102 Noise increase determination unit 103 Temporary stop unit 104 Noise increase position storage unit 105 Noise reduction determination unit 106 Deafness period measurement unit 107 Rewind time determination unit 108 Rewinding reproduction unit 109 Decoding unit TN Hearing loss period Tc1 Noise increasing position Tcb Reference position Tcs in the previous rewind reproduction Start position in the previous rewind reproduction

Claims (5)

Audio content storage means for holding audio content;
Playback control means for playing back the audio content;
Noise detection means for detecting the noise level,
The reproduction control means includes a noise increase position storage means for storing a reproduction position of the audio content when the noise level exceeds a first threshold as a noise increase position;
Deafness period measuring means for measuring, as a deafness period, a time from when the noise level exceeds a first threshold to when it falls below a second threshold;
A rewind time determining means for determining a rewind time based on the hearing loss period;
An audio reproducing apparatus comprising: rewind reproduction means for rewinding reproduction of the audio content from the noise increase position to a position that is traced back by the rewind time at the end of the hearing loss period.   2. The audio reproduction device according to claim 1, wherein the rewind time determining means lengthens the rewind time as the deafness period is longer.   3. The audio playback device according to claim 2, wherein the rewind playback means sets the start position of the previous rewind playback as a lower limit of the start position in the current rewind playback.   The said reproduction | regeneration control means has a temporary stop means to suspend reproduction | regeneration of the said audio | voice content based on the comparison result which compared the said noise level with the 1st threshold value. The audio reproducing device described. An acceleration detecting means for detecting acceleration;
The pause means pauses reproduction of the audio content based on a comparison result comparing the noise level with a first threshold and a comparison result comparing the magnitude of the acceleration with a determination threshold. The sound reproducing device according to claim 4.

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