JP6501223B2 - Electronic device, electronic system, voice output program and voice output method - Google Patents

Description

  The present invention relates to an electronic device that outputs audio data transmitted from an external information terminal, and more particularly to a method of controlling the volume level of audio data.

  BACKGROUND ART With the spread of information terminals represented by smartphones, there are increasing forms in which the information terminals are connected to an on-vehicle apparatus such as a car navigation system and used. The connection between the in-vehicle device and the information terminal is, for example, wired connection with a USB cable, wireless connection with Bluetooth (registered trademark) (hereinafter referred to as BT connection or BT communication), wireless connection with Wi-Fi (registered trademark) (hereinafter referred to as It is performed by WF connection or WF communication). By connecting the information terminal and the in-vehicle apparatus, audio data and image data received and / or stored in the information terminal can be output from a speaker, a liquid crystal display, or the like provided in the in-vehicle apparatus.

Patent Document 1 discloses a music playback device that outputs audio data output from a portable device by an external audio device. Here, since the output level of the portable device differs depending on the model, there is a problem that it is necessary to adjust the volume and the like of the external audio device according to the model of the portable device. In order to solve this problem, Patent Document 1 determines the model of the connected portable device, and prepares volume / sound quality adjustment means for outputting a volume / sound quality adjustment signal according to the determined model of the portable device. The amplifier is adjusted by the volume / sound quality adjustment signal.

JP, 2006-310981, A

In a system that connects a conventional information terminal and an in-vehicle device, when the in-vehicle device receives voice data transmitted from the information terminal and the voice output function of the in-vehicle device is used to output voice data, The apparatus amplifies or attenuates the audio data transmitted from the information terminal as it is, and adjusts the sound quality and volume of the output audio.
However, when the audio data transmitted from the information terminal is distorted, the distorted audio is output regardless of the volume level set by the in-vehicle apparatus. For example, as shown in FIG. 10, when the voice data Sj transmitted from the information terminal is clipped over the dynamic range and the waveforms Z1 and Z2 exceeding the threshold Th are missing, distortion occurs in the voice data Sj. There is. Even if the volume level of the received audio data Sj is increased or decreased in the in-vehicle apparatus, distorted audio data Sj is output. Therefore, distortion is also generated in the audio output from the in-vehicle apparatus. Cause a decrease in

  The present invention solves such conventional problems, and an electronic device, an electronic system, and an audio output program capable of eliminating distortion of audio data transmitted from an information terminal and outputting high quality audio. And provide an audio output method.

  An electronic apparatus according to the present invention comprises communication means for enabling transmission and reception of data with an information terminal, adjustment means for adjusting the volume level of audio data, audio output means for outputting audio of audio data, and information The request means for requesting the terminal to change the volume level of the audio data, the first acquisition means for acquiring the audio data of the first volume level from the information terminal, and the request for lowering the volume level by the request means A second acquisition unit for acquiring audio data of a second volume level lower than the first volume level from the information terminal after being performed; audio data of the first volume level; and the second volume level Determining means for determining whether or not distortion occurs in audio data of the first volume level based on comparison with audio data of the first volume level, and the adjustment means and the request means based on the determination results of the determination means Even without a control means for controlling one.

  Preferably, when it is determined by the determination means that distortion does not occur in the audio data, the control means causes the request means to request a change from the second volume level to the first volume level. Preferably, when it is determined by the determination means that distortion occurs in the audio data, the control means causes the adjustment means to increase the volume level. Preferably, the adjustment means raises the volume level according to the difference between the first volume level and the second volume level. Preferably, the electronic device further includes first volume level determination means for determining whether or not the first volume level is larger than a predetermined value, wherein the first volume level is the predetermined value. When it is determined that the information volume is greater than the threshold, the request means requests the information terminal to lower the first volume level. Preferably, when the first volume level determination unit determines that the first volume level is equal to or less than the predetermined value, the request unit does not request the reduction of the first volume level. The control means does not cause the adjusting means to change the volume level. Preferably, the electronic device further includes second volume level determination means for determining whether the second volume level is larger than a predetermined value, and the second volume level is higher than the predetermined value. When it is determined that the second sound volume level is lower than the second sound volume level, the second acquisition means further requests sound data of a third sound volume level smaller than the second sound volume level. Obtaining the determination means further determines whether distortion occurs in the audio data of the second volume level based on comparison of the audio data of the second volume level and the audio data of the third volume level; The control means controls at least one of the adjustment means and the request means based on the determination result of the determination means. Preferably, when the second volume level determination unit determines that the second volume level is equal to or less than the predetermined value, the control unit determines that distortion is generated by the determination unit. Even in this case, the request means does not lower the volume level further, and causes the adjustment means to increase the volume level according to the difference between the first volume level and the second volume level. Preferably, the determination means determines that distortion occurs in the audio data when the difference between the audio data of the first volume level and the audio data of the second volume level is not constant, and the audio is voiced when the difference is constant. Determine that the data is not distorted.

  An electronic system according to the present invention includes the electronic device having the above configuration and an information terminal, and the information terminal changes the volume level of audio data in response to a request from the request unit. And transmitting means for transmitting the audio data of the volume level changed by the changing means to the electronic device. Preferably, the electronic device further includes reproduction request means for requesting the information terminal to reproduce the audio, and the information terminal includes reproduction means for reproducing the audio in response to the request of the reproduction request means, the transmission The means transmits the audio data reproduced by the reproduction means.

  An audio output program according to the present invention includes communication means for enabling transmission and reception of data with an information terminal, adjustment means for adjusting the volume level of audio data, and audio output means for outputting audio of audio data. The electronic device is performing steps of acquiring audio data of a first volume level from the information terminal, and when the first volume level is greater than a threshold, Requesting lowering, acquiring audio data of a second volume level lower than the first volume level from the information terminal, audio data of the first volume level, and audio of the second volume level Determining whether distortion occurs in the audio data of the first volume level based on comparison with the data, and it is determined that the audio data is not distorted Requesting the information terminal to change the second volume level to the first volume level, and causing the adjusting means to increase the volume level when it is determined that the audio data is distorted Have.

  An audio output method according to the present invention includes communication means for enabling transmission and reception of data with an information terminal, adjusting means for adjusting the volume level of audio data, and audio output means for outputting audio of audio data. In the electronic device, the step of acquiring voice data of a first volume level from the information terminal, and when the first volume level is larger than a threshold, the information terminal is lowered in volume level of the voice data. Requesting, acquiring audio data of a second volume level lower than the first volume level from the information terminal, audio data of the first volume level, and audio data of the second volume level Determining whether distortion occurs in the audio data of the first volume level based on the comparison of the first volume level, and when it is determined that the distortion does not occur in the audio data, the information Second requesting a change from volume level to the first volume level, on the other hand, when it is determined that distortion has occurred in the audio data at the end, and a step of causing to increase the volume level to said adjusting means.

  According to the present invention, it is determined whether or not distortion occurs in audio data from the information terminal, and the automatic adjustment of the volume level of the information terminal or the automatic adjustment of the volume level of the electronic device is performed according to the determination result. Since this is possible, it is possible to obtain a high-quality sound output with reduced distortion.

It is a figure showing an example of composition of an audio output system concerning an example of the present invention. It is a block diagram showing an example of composition of an in-vehicle device concerning an example of the present invention. It is a figure showing an example of composition of an audio output part concerning an example of the present invention. It is a figure which shows the functional structural example of the audio | voice output control program which concerns on the Example of this invention. It is a block diagram showing an example of composition of an information terminal concerning an example of the present invention. It is a figure showing an example of functional composition of a control program concerning an example of the present invention. It is a figure showing the operation flow of the electronic system concerning the example of the present invention. It is a figure showing the operation flow of the electronic system concerning the example of the present invention. It is a figure showing the operation flow of the electronic system concerning the example of the present invention. It is a figure showing the operation flow of the electronic system concerning the example of the present invention. It is a conceptual diagram explaining the distortion determination method of the distortion determination part which concerns on the Example of this invention. It is a figure which shows notionally "Sampling A" and "Sampling B" when it determines with the difference C being fixed. It is a figure which shows typically distortion of the audio | voice data transmitted from an information terminal.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. In a preferred embodiment of the present invention, the electronic device is connected to the portable terminal via a wireless or wired communication means. The electronic device receives voice data transmitted from the portable terminal and performs voice output of the received voice data. The electronic device includes at least a function of communicating with an information terminal, a function of outputting audio data, and in addition, for example, a navigation function, a function of reproducing audio and video data, a function of receiving television and radio, data communication A function etc. can be provided. The electronic device can be, for example, an on-vehicle device mounted on a mobile object such as a car. On the other hand, the information terminal has a function of reproducing voice data, a function of transmitting voice data, a function of communicating with an external device, and the like. An information terminal is portable information terminals, such as a smart phone, a tablet side terminal, a portable personal computer, for example. The communication means between the electronic device and the information terminal can be, for example, wireless communication such as BT communication, WF communication, near-field infrared communication, USB communication, or the like. In a preferred example, each of the electronic device and the information terminal comprises a BT device having a profile that enables transmission and reception of audio data.

  FIG. 1 is a view showing a configuration example of an electronic system according to an embodiment of the present invention. An electronic system 1 according to an embodiment of the present invention is configured to include an on-vehicle device 10 and an information terminal 20. The in-vehicle apparatus 10 is connected to the information terminal 20 via the communication unit 2. The communication unit 2 can correspond to one or more communication standards (for example, BT communication, WF communication, USB connection, etc.), and data transmission / reception is performed via the communication unit 2. Preferably, the in-vehicle apparatus 10 and the information terminal 20 respectively include BT devices capable of transmitting and receiving audio data according to the BT audio profile.

  FIG. 2 is a block diagram showing an example of the configuration of the in-vehicle apparatus according to the embodiment of the present invention. The in-vehicle apparatus 10 includes an input unit 100, a multimedia reproduction unit 110, a navigation unit 120, a display unit 130, an audio output unit 140, a storage unit 150, a communication unit 160, and a control unit 170. However, the configuration of FIG. 2 is an example, and the configuration of the in-vehicle apparatus 10 is not limited to this.

  The input unit 100 receives an instruction from the user by an input key device, a voice recognition input device, a touch panel, or the like, and provides the instruction to the control unit 170. The multimedia reproduction unit 110 reproduces audio data and video data stored in a recording medium such as a CD, a DVD, a Blu-ray disc, a semiconductor memory, and a hard disk.

  The navigation unit 120 calculates the position of the vehicle based on the GPS signal transmitted from the GPS satellite and the sensor output of the gyro sensor or acceleration sensor mounted on the vehicle, and calculates the route from the calculated vehicle position to the destination Then, voice guidance of the calculated route is given, and a road map around the vehicle position is displayed on the display unit 130.

  The display unit 130 includes a liquid crystal display and other display devices. For example, the display unit 130 displays an image of a road map generated by the navigation unit 120 or displays a setting screen or menu screen for performing user setting of the in-vehicle device 10 Do. Furthermore, the reproduction image is displayed by the multimedia reproduction unit 110.

  The audio output unit 140 outputs the audio of the audio data reproduced by the multimedia reproduction unit 110, and outputs the audio guidance etc. generated by the navigation unit 120. Furthermore, as shown in FIG. 1, when the information terminal 20 is connected, it is also possible to perform voice output of audio data transmitted from the information terminal 20 in response to a reproduction request from the in-vehicle apparatus 10. FIG. 3 is a diagram showing a configuration example of the audio output unit 140 according to the present embodiment. The audio output unit 140 receives the digital audio data L1 reproduced by the multimedia reproducing unit 110 or the like of the in-vehicle apparatus 10 and the digital audio data L2 transmitted from the information terminal 20, and either one according to the switching signal S1 from the control unit 170. A switching unit 142 for outputting one digital audio data, a volume adjusting unit 144 for adjusting the volume level of the digital audio data output from the switching unit 142 according to the volume level adjusting signal S2 from the control unit 170, a volume adjusting unit 144 And a speaker 146 for outputting the audio of the audio signal whose volume level has been adjusted. When adjusting the volume level of the digital audio data, the volume adjustment unit 144 includes a digital amplifier and includes a D / A converter that converts the digital audio data whose volume level is adjusted into an analog audio signal. Alternatively, the volume adjustment unit 144 may include an analog amplifier that converts digital audio data into an analog audio signal by the D / A converter and adjusts the volume level of the converted analog audio signal.

  The storage unit 150 stores application software executed by the in-vehicle apparatus 10, a program executed by the control unit 170, map data required when the navigation unit 120 is executed, and the like. The communication unit 160 configures the communication unit 2 with the information terminal 20, and includes, for example, a BT device for performing BT communication, a WF device for performing WF communication, and the like.

  In a preferred embodiment, the control unit 170 is configured of a microcontroller including a ROM, a RAM, and the like, and the ROM or RAM can store various programs for controlling the operation of each unit of the on-vehicle device 10. In the present embodiment, the control unit 170 executes an audio output control program 200 for controlling the output of audio data transmitted from the information terminal 20.

  FIG. 4 is a diagram showing an example of a functional configuration of an audio output control program according to an embodiment of the present invention. The audio output control program 200 according to the present embodiment includes a reproduction request unit 201 that requests the information terminal 20 to reproduce audio data, an audio switching unit 202 that switches the switching unit 142 of the audio output unit 140, and the information terminal 20. A first sampling unit 203 for sampling audio data transmitted from the computer, an initial volume level reading unit 204 for reading an initial volume level of audio data transmitted from the information terminal 20, distortion of the audio data transmitted from the information terminal 20 A first distortion determination unit 205 that determines presence / absence, a volume level reduction request unit 206 that requests the information terminal 20 to reduce the volume level, and a second sampling unit 207 that samples audio data for which the volume level has been reduced. , Voices sampled by the first sampling unit 203 and the second sampling unit 207, respectively. Second distortion determination unit 208 that determines presence / absence of distortion of audio data at the initial volume level by comparing the data, and a post-change volume level reading unit 209 that reads the volume level of the audio data for which the volume level has been lowered. The volume level change request unit 210 requests the information terminal 20 to change the volume level based on the determination result of the second distortion determination unit 208, and adjusts the volume level based on the determination result of the second distortion determination unit 208 And a volume level adjustment unit 211 for outputting the volume level adjustment signal S2 to the volume adjustment unit 144. The detailed operation of each of these units will be described later.

  FIG. 5 is a block diagram showing an exemplary configuration of an information terminal according to an embodiment of the present invention. The information terminal 20 according to this embodiment includes an input unit 300, a communication unit 310, a display unit 320, a multimedia reproduction unit 330, an audio output unit 340, a storage unit 350, and a control unit 360. However, this configuration is an example, and the information terminal 20 is not limited to this configuration. For example, the information terminal 20 can further include a telephone function, a navigation function, and the like.

  The input unit 300 receives an instruction from the user by an input key device, a voice recognition input device, a touch panel, or the like, and provides the instruction to the control unit 360. The communication unit 310 configures the communication unit 2 with the in-vehicle device 10, includes, for example, a BT device, a WF device, a USB device, and the like, and enables transmission and reception of data with the in-vehicle device 10. The display unit 320 displays the video reproduced by the multimedia reproduction unit 330 and the video acquired from the Internet or the like through the communication unit 310. The multimedia reproduction unit 330 reproduces audio data and video data stored in the storage unit 350, and reproduces multimedia data acquired from the communication unit 310.

  The audio output unit 340 outputs the audio data etc. reproduced by the multimedia reproduction unit 330 as audio. Furthermore, the audio output unit 340 includes a volume adjustment unit that adjusts the volume level of the audio data to be reproduced, and adjusts the volume level in response to an input operation from the user or a request from the on-vehicle device 10 as described later. . The storage unit 350 stores a program executed by the control unit 360, application software acquired from the outside, multimedia data, and the like.

  The control unit 360 includes a microprocessor and a microcontroller, and controls each unit by executing a program stored in the ROM / RAM or the storage unit 350. Furthermore, in the present embodiment, when the in-vehicle apparatus 10 is connected via the communication unit 2, the control unit 360 controls a control program for controlling the output of audio data in cooperation with the audio output control program of the in-vehicle apparatus 10. Run. FIG. 6 is a block diagram showing a functional configuration of the control program 400. The control program 400 may be stored in advance in the information terminal 20 or may be a program installed as an application.

  The control program 400 transmits the audio data including the sound volume level through the communication unit 310. The audio reproduction unit 410 causes the multimedia reproduction unit 330 or the like to reproduce the audio data in response to a request from the reproduction request unit of the in-vehicle device 10. The audio data transmission unit 420 includes a volume level change unit 430 that changes the volume level of the audio output unit 340 in response to a request for changing the volume level from the in-vehicle apparatus 10. When transmitting the audio data to the on-vehicle apparatus 10, the transmitting unit 420 adds the volume level set by the volume adjusting unit of the audio output unit 340 to the audio data.

  Next, the voice output operation in the electronic system according to the embodiment of the present invention will be described with reference to the flows shown in FIGS. 7A to 7D (note that FIGS. 7A to 7D may be generically called FIG. 7). ). The variable “VD1” used in FIG. 7 indicates the initial volume level, and the variable “VD2” indicates the changed volume level. Also, “Sampling A” and “Sampling B” indicate voice data from the information terminal 20 sampled by the first sampling unit 203 and the second sampling unit 207.

  First, in FIG. 7A, the reproduction request unit 201 of the in-vehicle apparatus 10 requests the information terminal 20 to reproduce audio data (S100). The request by the reproduction request unit 201 is made via the communication means 2. When the information terminal 20 is connected to the in-vehicle device 10 via the communication means 2, the in-vehicle device 10 can function as if it were an input / output device of the information terminal 20. For example, from the on-vehicle apparatus side, application software held by the information terminal 20 can be executed, and audio data and video data held by the information terminal 20 can be reproduced. The on-vehicle apparatus 10 is transmitted from the information terminal 20 Audio data and video data, which are output to the audio output unit 140 and the display unit 130. The reproduction request unit 201 may be executed in response to an input from the user, or may be automatically executed in a predetermined sequence of the control unit 170 or the like. When the request by the reproduction request unit 210 is made, the voice switching unit 202 outputs the switching signal S1 to the switching unit 142 of the voice output unit 140, and causes the switching unit 142 to select voice data from the information terminal 20.

  When there is a reproduction request from the in-vehicle apparatus 10, the audio reproduction unit 410 of the information terminal 20 reproduces the music (S102). For example, when a CD album is selected as the media source, the audio reproduction unit 410 causes the multimedia reproduction unit 330 to reproduce the track # 1 of the CD. The audio data to be reproduced may be music data that the user desires to view, or may be dedicated audio data for determining distortion of the audio data. For the sake of convenience, in order to identify audio data to be reproduced in S102, the audio data is represented by "track 1". The audio data reproduced by the information terminal is transmitted by the audio data transmission unit 420 to the on-vehicle apparatus 10 via the communication unit 2.

  When the audio data transmitted from the information terminal 20 is received by the on-vehicle device 10 via the communication unit 2, the first sampling unit 203 then performs a predetermined period, for example, 10, on the audio data (track 1). Sampling is performed for a second (S104). The first sampling unit 203 may sample audio data using, for example, a sampling circuit or a sampling / holding circuit. The sampled result is held as "Sampling A". The audio data sampled by the first sampling unit 202 is data to be determined as to whether or not distortion is included.

  Next, the initial sound volume level reading unit 204 reads sound volume data representing the initial sound volume level superimposed on the audio data (track 1) and encoded (S106), and holds this as the initial sound volume level VD1. Set to = VD1. When the volume level can be read from the audio data sampled by the first sampling unit 203, the initial volume level reading unit 204 may read it from there. Further, the initial sound volume level reading unit 204 may request the information terminal 20 to transmit the sound volume level, and acquire data representing the sound volume level transmitted in response to the request.

  Next, the first distortion determination unit 205 determines whether the initial volume level VD1 is larger than a predetermined threshold (S108). Here, the range of the volume level of the information terminal 20 is assumed to be the minimum 0 to the maximum 10, and the threshold is set to, for example, “5” of the center (half) within the range. This is because if it is approximately smaller than half of the volume level, it is assumed that the audio data has no distortion. However, this is an example, and when the range of the volume level of the information terminal is 0 to 20, the threshold may be set to “10” or may be set to any other value. The range of the volume level of the information terminal 20 may be acquired from the information terminal according to a specific command from the in-vehicle apparatus, or may be set in advance.

  If the initial volume level VD1 is larger than the threshold, the first distortion determination unit 205 may possibly distort the audio data (track 1), and the distortion determination is continued. ) Is determined to be unlikely to be distorted or very small, and distortion determination is not performed thereafter (S108). In this case, as shown in FIGS. 7C and 7D, the process proceeds to step S128, and the volume level adjustment unit 211 adjusts the volume level of the volume adjustment unit 144 via the volume level adjustment signal S2 because VD1 = VD2. Absent. Therefore, the sound data transmitted from the information terminal 20 is amplified or attenuated in the sound volume adjustment unit 144 of the on-vehicle apparatus 10 as it is.

  Next, when it is determined that the initial sound volume level VD1 is larger than the threshold, as shown in FIG. 7B, the sound volume level decrease request unit 206 requests the constant decrease of the sound volume level (S110). The volume level changing unit 430 of the information terminal 20 lowers the volume level of the volume adjustment unit of the audio output unit 340 of the information terminal side in response to the request for constant reduction of the volume level (S112).

  Next, the reproduction request unit 201 again requests reproduction of audio data (S114), and the audio reproduction unit 410 on the information terminal side reproduces track # 1 in response to the reproduction request (S116). The audio data transmission unit 420 transmits the reproduced audio data (track 1) to the on-vehicle apparatus 10. It should be noted that the audio data transmitted after the request for lowering the volume level is the same audio data as the audio data to be transmitted first, but the volume level is smaller than that of the first one.

  Next, the second sampling unit 207 samples the audio data (track 1) for the same period as the sampling period of the first sampling unit 203, and holds the sampling result as “Sampling B” (S118). In “Sampling B”, audio data having a volume level lower than that of “Sampling A” is held.

  Next, as shown in FIG. 7C, the second distortion determination unit 208 compares “Sampling A” and “Sampling B”, and calculates a difference of “Sampling A” − “Sampling B” = C (S120) ), It is determined whether the difference C is constant. When the difference C is constant, it is determined that distortion does not occur in the audio data, and when the difference C is not constant, it is determined that the distortion occurs in the audio data (S122).

  FIG. 8 is a conceptual diagram for explaining the distortion determination method of the second distortion determination unit 208. FIG. 8A shows a waveform Sj of speech data including distortion, and some of the waveforms Z1 and Z2 are clipped because they are larger than the threshold Th. On the other hand, FIG. 8B shows the waveform Sk of audio data in which the volume level is lower than that in FIG. 8A and distortion is not generated, and the waveform is smaller than the threshold Th and the waveform is not clipped. The two waveforms Sj and Sk in FIG. 8A and FIG. 8B are the same sound data of the same sound source, and only the volume level differs. The waveforms Sj and Sk are sampled by the first sampling unit 203 and the second sampling unit 207, and held as "Sampling A" and "Sampling B" as sampling values. The second distortion determination unit 208 calculates the difference C between the two samples and compares the difference C between the two samples.

  When the voice data with distortion shown in FIG. 8A and the voice data without distortion shown in FIG. 8B are compared, the difference C at each sample point is not constant. Assuming that the differences between the sample points SM1, SM2 and SM3 are C1, C2 and C3, the waveforms Z1 and Z2 are clipped at the sample points SM1 and SM2, so the differences become smaller, but at the sample point SM3 Because the waveform is not clipped, the difference is larger than the sample points SM1, SM2. That is, C1 ≠ C2 ≠ C3, and the difference between the sample points SM1, SM2, and SM3 does not become constant. Therefore, it is determined that distortion occurs in the audio data shown in FIG. On the other hand, when distortion-free audio data is compared, as shown in FIG. 9, the differences C1, C2, C3 at the sample points SM1, SM2, SM3 become constant. However, C1 = C2 = C3 does not necessarily have to be the same in consideration of an error or a margin such as a sampling cycle, and "the difference is constant" as long as the difference is within a predetermined range.

  When the second distortion determination unit 208 determines that the difference C is constant, that is, distortion does not occur in the audio data of the initial volume level VD1 (S122), the volume level change request unit 210 sets VD2 = VD1, and the information The terminal 20 is requested to return the volume level to the initial volume level VD1 (S124). In response to this request, the volume level changing unit 430 on the information terminal side returns the volume level to the initial VD1 (S126). On the other hand, on the in-vehicle device side, as shown in FIG. 7D, the volume level adjustment unit 211 adjusts the volume level according to the difference between the initial volume level VD1 and the volume level VD2 after change (S128). Since the processing of VD1 = VD2 is performed by the request unit 210 (S124), the volume level adjustment unit 211 does not perform the tone adjustment of the volume adjustment unit 144 on the in-vehicle apparatus side. Next, when the user designates a song (S130), the reproduction request unit 201 requests the information terminal 20 to reproduce, and the audio reproduction unit 410 on the information terminal side reproduces the designated song (S132) The reproduced voice data is transmitted to the in-vehicle device 10. This audio data will have an initial volume level VD1. Then, the voice output unit 140 outputs the voice of the received voice data (S134).

  On the other hand, when it is determined that distortion occurs in the audio data (S122), "Sampling A" of the first sampling unit 203 is replaced with "Sampling B" (S140). Next, the post-change volume level reading unit 209 reads the volume level of the audio data after the volume level reduction request is made, and holds this as VD2 (S142). Next, the first distortion determination unit 205 determines whether the post-change volume level VD2 is larger than the threshold (S144). If the post-change volume level VD2 is equal to or less than the threshold value, it is determined that the volume level on the information terminal side is sufficiently small, and it is determined that there is distortion in the audio data in order to suppress further reduction. If so, it is removed from the feedback loop, and the process proceeds to step S128. Then, the volume level adjustment unit 211 outputs a volume level adjustment signal S2 according to the difference between the initial volume level VD1 and the volume level VD2 after change to the volume adjustment unit 144, and the volume adjustment unit 144 responds to VD1-VD2. Increase the volume level (S128).

  If it is determined by the first distortion determination unit 205 that the post-change volume level VD2 is larger than the threshold value, the process returns to step S110, and the volume level reduction request unit 206 reduces the volume level to the information terminal 20 again. It is requested, and the processing of steps S112 to S122 is repeated. This process is repeated until it is determined that the difference C is constant (S122) or the volume level VD2 after change becomes less than or equal to the threshold (S144).

  According to the present embodiment, when the voice data output from the information terminal 20 is voice-outputted on the in-vehicle apparatus side, it is automatically determined whether the voice data from the information terminal 20 is distorted or not. Automatically determines the volume level on the information terminal side, receives distortion-free or distortion-suppressed voice data, and amplifies or attenuates the voice data. Can. Therefore, sound output with better sound quality is possible as compared with the conventional case of amplifying or attenuating distorted speech data as it is. In addition, when the volume level on the information terminal side is lowered, the volume level on the in-vehicle apparatus side is increased to compensate for this, so that it is possible to prevent the output of the voice of the extremely small volume level.

  In the above embodiment, an example is shown in which the music newly designated by the user is reproduced after the distortion determination / adjustment processing of the audio data is performed, but the present invention is not limited to this. When the reproduction of the music of is instructed, the reproduction of the music of the track # 1 may be continued.

  Next, another embodiment of the present invention will be described. In the above embodiment, the distortion determination / adjustment of the audio data is performed at the time of the reproduction of the music designated by the user. However, when the on-vehicle apparatus is connected to the information terminal 20 via the communication means 2, it is automatically It is also possible to determine / adjust distortion of audio data. In this case, the in-vehicle device 10 requests the information terminal 20 to transmit voice data of an initial volume level and voice data of a volume level smaller than the initial volume level, and the information terminal responds to the request. And transmit voice data of two different voice levels. The audio data may be audio data dedicated to distortion determination. The initial volume level is the volume level set in the information terminal.

  The on-vehicle apparatus side performs mute processing so that the voice data received from the information terminal is not output from the voice output unit 140 when voice data of two different voice levels is received, or the switching unit 142 Don't let them select voice data. Then, according to the flow shown in FIG. 7 described above, the in-vehicle apparatus determines whether the audio data of the initial volume level has distortion, and if it has distortion, requests reduction of the initial volume level, and In order to compensate for this, the volume level on the in-vehicle apparatus side may be raised, while transmission at the initial volume level may be requested if distortion does not occur.

  Although the preferred embodiments of the present invention have been described above in detail, the present invention is not limited to the specific embodiments, and various modifications may be made within the scope of the subject matter of the invention described in the claims. Changes are possible.

1: Electronic system 2: Communication means 10: In-vehicle device 20: Information terminal 100: Input unit 110: Multimedia playback unit 120: Navigation unit 130: Display unit 140: Audio output unit 142: Switching unit 144: Volume adjustment unit 146: Speaker 150: Storage unit 160: Communication unit 170: Control unit 200: Audio output control program 300: Input unit 310: Communication unit 320: Display unit 330: Multimedia playback unit 340: Audio output unit 350: Storage unit 360: Control unit 400: Control program

Claims (13)

Communication means for enabling transmission and reception of data with the information terminal;
Adjustment means for adjusting the volume level of audio data;
Voice output means for outputting voice of voice data;
Request means for requesting the information terminal to change the volume level of the audio data;
First acquisition means for acquiring voice data of a first volume level from the information terminal;
Second acquisition means for acquiring audio data of a second volume level smaller than the first volume level from the information terminal after the volume level reduction request is made by the request means;
Determining means for determining whether or not distortion occurs in the audio data of the first volume level based on comparison between the audio data of the first volume level and the audio data of the second volume level;
Control means for controlling at least one of the adjustment means and the request means based on the determination result of the determination means;
An electronic device having The control method according to claim 1, wherein the control means causes the request means to request a change from the second volume level to the first volume level when it is determined by the determination means that no distortion occurs in the audio data. Electronic devices. The electronic device according to claim 1, wherein the control unit causes the adjusting unit to increase the volume level when it is determined by the determination unit that distortion is generated in the audio data. The electronic device according to claim 3, wherein the adjustment means raises the volume level in accordance with a difference between the first volume level and the second volume level. The electronic device further comprises first volume level determining means for determining whether the first volume level is greater than a predetermined value,
The method according to claim 1, wherein when it is determined that the first volume level is larger than the predetermined value, the request means requests the information terminal to lower the first volume level. Electronic device. When the first volume level determination unit determines that the first volume level is equal to or less than the predetermined value, the request unit does not request the reduction of the first volume level, and the control is performed. The electronic device according to claim 5, wherein the means does not cause the adjusting means to change the volume level. The electronic device further determines whether the second volume level is larger than a predetermined value when it is determined by the determination unit that the audio data of the first volume level is distorted. Including a second volume level determination means,
When the second volume level determining means determines that the second volume level is larger than the predetermined value, the request means further requests the second volume level to be lowered.
The second acquisition means further acquires audio data of a third volume level lower than the second volume level,
The determination means further determines whether distortion occurs in the audio data of the second volume level based on comparison of the audio data of the second volume level and the audio data of the third volume level,
The electronic device according to any one of claims 1 to 6, wherein the control unit controls at least one of the adjustment unit and the request unit based on the determination result of the determination unit.
When the second volume level determination unit determines that the second volume level is equal to or less than the predetermined value, the control unit determines that distortion is generated by the determination unit. Even if this is the case, the request means does not lower the volume level further, and causes the adjustment means to increase the volume level according to the difference between the first volume level and the second volume level. Electronic device according to claim 1. The determination means determines that distortion occurs in the audio data when the difference between the audio data of the first volume level and the audio data of the second volume level is not constant, and when the difference is constant, the audio data is The electronic device according to claim 1, wherein it is determined that no distortion has occurred. An electronic system comprising the electronic device according to any one of claims 1 to 9 and an information terminal,
The information terminal is
Changing means for changing the volume level of the audio data in response to the request from the request means;
Transmission means for transmitting the audio data of the volume level changed by the change means to the electronic device;
Including electronic systems. The electronic device further includes reproduction request means for requesting the information terminal to reproduce sound,
The information terminal includes reproduction means for reproducing sound in response to a request from the reproduction request means;
11. The electronic system according to claim 10, wherein the transmitting means transmits the audio data reproduced by the reproducing means. A voice output program executed by an electronic device including communication means for enabling transmission and reception of data to and from an information terminal, adjustment means for adjusting the volume level of voice data, and voice output means for outputting voice of voice data. There,
Acquiring voice data of a first volume level from the information terminal;
Requesting the information terminal to lower the volume level of the audio data when the first volume level is greater than the threshold;
Acquiring audio data of a second volume level lower than the first volume level from the information terminal;
Determining whether or not distortion occurs in audio data of a first volume level based on comparison of audio data of the first volume level and audio data of the second volume level;
When it is determined that no distortion occurs in the audio data, the information terminal is requested to change from the second volume level to the first volume level, and on the other hand, it is determined that the audio data is distorted , Causing the adjusting means to increase the volume level;
An audio output program having A voice output method in an electronic device, comprising: communication means for enabling transmission and reception of data to and from an information terminal, adjustment means for adjusting a volume level of voice data, and voice output means for outputting voice of voice data. ,
Acquiring voice data of a first volume level from the information terminal;
Requesting the information terminal to lower the volume level of the audio data when the first volume level is greater than the threshold;
Acquiring audio data of a second volume level lower than the first volume level from the information terminal;
Determining whether or not distortion occurs in audio data of a first volume level based on comparison of audio data of the first volume level and audio data of the second volume level;
When it is determined that no distortion occurs in the audio data, the information terminal is requested to change from the second volume level to the first volume level, and on the other hand, it is determined that the audio data is distorted , Causing the adjusting means to increase the volume level;
An audio output method having

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