JP2012195791A - On-vehicle audio device and on-vehicle audio system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To localize a sound image to a plurality of listeners suitably.SOLUTION: An on-vehicle audio device is configured so that phases of a composite wave based on outputs of loudspeakers arranged at the right and the left of a cabin become in-phase between both ears of a listener corresponding to each seating position in the cabin by changing a phase for each of acoustic signals corresponding to the respective loudspeakers, concretely, so that the phases of the composite wave are adjusted so as to be only positive phases or reverse phases between both the ears by shifting phases of an R signal outputted from an R loudspeaker (13) and an L signal outputted from an L loudspeaker (14). In addition, in the case that the loudspeakers are arranged at the front and the back of the cabin, the on-vehicle audio device is configured so that a reverberation component can be given to the acoustic signal corresponding to the loudspeaker at the back of the cabin.

Description

  The present invention relates to an in-vehicle audio apparatus and an in-vehicle audio system, and more particularly to an in-vehicle audio apparatus and an in-vehicle audio system that can satisfactorily localize sound images for a plurality of listeners.

  2. Description of the Related Art Conventionally, an in-vehicle audio device that arranges a plurality of speakers in a vehicle interior and outputs acoustic signals of various sound sources such as music and voice is known. And in this vehicle-mounted audio apparatus, the device which localizes a sound image to a suitable position for a listener has been performed.

  For example, a technique called a time alignment method that localizes a sound image to a predetermined position using a time difference between sounds reaching the left and right ears of a listener is known. In addition, a technique for localizing a sound image to a predetermined position by giving a sound pressure difference between both ears of a listener has also been known.

  Further, in recent years, a technique for generating a phase difference by localizing a sound image by regarding a time difference of sound as a phase difference and shifting the phase (hereinafter referred to as “phase shift”) has become widespread. For example, Patent Document 1 discloses a technique for shifting the phase of a “5.1 channel system” center channel audio signal to localize a sound image.

Japanese Patent Laid-Open No. 2003-061198

  However, when the conventional technology is used, there is a problem that although the effect of sound image localization is obtained for a single listener, the effect of sound image localization is difficult to obtain for a plurality of listeners. This is because it is difficult to locate a sound image at a plurality of listening positions in a vehicle cabin in which speakers are often arranged at left and right asymmetrical positions as seen from any listener.

  Further, since the technique of Patent Document 1 is a technique for shifting the phase of the center channel audio signal, it cannot be applied when the center channel audio signal is not used, such as “2-channel system”.

  For these reasons, it has become a big issue how to realize an in-vehicle audio apparatus or an in-vehicle audio system that can satisfactorily localize sound images for a plurality of listeners.

  The present invention has been made in order to solve the above-described problems caused by the prior art, and provides an in-vehicle audio apparatus and an in-vehicle audio system that can satisfactorily localize sound images for a plurality of listeners. The purpose is to do.

  In order to solve the above-described problems and achieve the object, the present invention is an in-vehicle audio device that outputs sound from speakers arranged on the left and right sides of a passenger compartment, and both ears of a listener corresponding to seating positions, respectively. And a phase adjusting unit for adjusting the phase of the synthesized wave based on the output of the speaker to be in phase.

  The present invention also provides an in-vehicle audio system that includes an in-vehicle audio device that outputs sound from speakers mounted on the left and right sides of a vehicle compartment and a management device that is network-connected to the in-vehicle audio device. The in-vehicle audio device includes parameter information acquisition means for acquiring parameter information related to phase change processing of the output of the speaker in the vehicle in which the in-vehicle audio device is mounted, from the management device, and the parameter information Phase adjustment means for adjusting an acoustic signal based on the parameter information acquired by the acquisition means so that the phase of the synthesized wave based on the output of the speaker is in phase between both ears of the listener corresponding to each seating position The management device provides the parameter information corresponding to the vehicle to the vehicle-mounted auto. Characterized by comprising parameter information providing means for providing the I O device.

  According to the present invention, between the listener's ears corresponding to the seating positions, the left and right sides of the passenger compartment, that is, in a general vehicle, the synthesized wave based on the output of the speaker disposed on the front seat or rear seat door is used. Since the phase is adjusted so as to be in phase, the sound image can be localized well for a plurality of listeners.

FIG. 1 is a diagram showing an outline of a sound image localization method according to the present invention. FIG. 2 is a diagram illustrating a configuration example of an in-vehicle audio device. FIG. 3 is a block diagram illustrating the configuration of the DSP according to the first embodiment. FIG. 4 is a diagram for explaining the phase adjustment processing in the phase adjustment unit. FIG. 5 is a flowchart of a process procedure performed by the DSP according to the first embodiment. FIG. 6 is a block diagram illustrating the configuration of the DSP according to the second embodiment. FIG. 7 is a flowchart illustrating a processing procedure of processing executed by the DSP according to the second embodiment. FIG. 8 is a block diagram illustrating the configuration of the DSP according to the third embodiment. FIG. 9A is a diagram 1 for explaining the reverberation imparting process in the reverberation imparting unit. FIG. 9B is a diagram (part 2) for explaining the reverberation imparting process in the reverberation imparting unit. FIG. 9C is a third diagram illustrating the reverberation imparting process in the reverberation imparting unit. FIG. 10 is a flowchart of a process procedure performed by the DSP according to the third embodiment. FIG. 11 is a block diagram illustrating the configuration of the DSP according to the fourth embodiment. FIG. 12 is a flowchart illustrating a processing procedure of processing executed by the DSP according to the fourth embodiment. FIG. 13 is a block diagram illustrating the configuration of the in-vehicle audio system according to the fifth embodiment. FIG. 14 is a diagram illustrating an example of an operation for acquiring parameter information. FIG. 15 is a flowchart illustrating a processing procedure of processing executed by the vehicle-mounted audio system according to the fifth embodiment.

  Exemplary embodiments of a sound image localization method according to the present invention will be described below in detail with reference to the accompanying drawings. In the following, the outline of the sound image localization method according to the present invention will be described with reference to FIG. 1, and then an example of an in-vehicle audio apparatus and an in-vehicle audio system to which the sound image localization method according to the present invention is applied will be described with reference to FIG. It will be described with reference to FIG.

  Also, in the following, in order to avoid confusion between “phase” and “phase shift”, “phase shift” in the sense of changing the phase, such as shifting the phase, is always described in “”.

  First, prior to detailed description of the embodiment, an outline of a sound image localization method according to the present invention will be described with reference to FIG. FIG. 1 is a diagram showing an outline of a sound image localization method according to the present invention. 1A shows an example of the seating position and speaker arrangement when the vehicle 50 is viewed from above, and FIG. 1B shows an outline of the sound image localization method according to the present invention. ing. In FIG. 1B, the sound image localization position of the listener 200 is indicated by an asterisk.

  As shown in FIG. 1A, the vehicle 50 includes a passenger compartment 51. The vehicle compartment 51 has a pair of left and right speakers and a seating position on the front side (see the portion surrounded by a broken-line rectangle F in the drawing) and the rear side (see the portion surrounded by the broken-line rectangle R in the drawing). (Refer to the position of the listener 200 in the figure).

  Here, as shown in FIG. 1 (B-1), according to the conventional method, the output sound waves of the R speaker 13 arranged on the right side of the vehicle compartment and the L speaker 14 arranged on the left side of the vehicle compartment are synthesized. Regarding the wave S, the phase relationship between both ears in the listener 200 was not considered.

  Specifically, as shown in FIG. 1B-1, for example, the phase of the synthesized wave S that reaches both ears of the listener 200 seated near the L speaker 14 (see section α in the figure). In some cases, the right ear was in the normal phase and the left ear was in the opposite phase.

  In addition, as shown in FIG. 1B-1, for the listener 200 seated near the R speaker 13 (see section β in the figure), the right ear is in reverse phase and the left ear is in normal phase. There was a case.

  In such a case, for the listener 200 seated near the L speaker 14, the sound image goes to the position near the L speaker 14, and for the listener 200 seated near the R speaker 13, the sound image goes to the position near the R speaker 13, respectively. It was localized (see the asterisk in the figure). That is, the sound image cannot be localized at a position appropriate for the listener 200.

  Note that, as indicated by a broken-line rectangle ForR in (B-1) of FIG. 1, such a deviation of the sound image localization similarly occurred in the front and rear of the passenger compartment 51.

  Therefore, in the sound image localization method according to the present invention, the phase of the synthesized wave S is adjusted so as to be in phase between both ears of the listener 200. Specifically, the phases of the R signal output from the R speaker 13 and the L signal output from the L speaker 14 are “shifted”, so that the phase of the synthesized wave S is correct between the ears of the listener 200. Adjust so that only the phase or only the reverse phase exists.

  For example, (B-2) in FIG. 1 shows that the phase of the synthesized wave S is only the positive phase for the listener 200 near the L speaker 14 (see section α in the figure), and the listener near the R speaker 13. 200 shows an example in which only the opposite phase is set (see the section β in the figure) and adjusted so as to be respectively.

  As a result, the sound image can be localized forward for both the listener 200 close to the L speaker 14 and the listener 200 close to the R speaker 13 (see the asterisk in the figure). That is, a sound image can be localized with respect to a plurality of listeners.

  Details of the above-described “phase shift” will be described later with reference to FIGS. 3 and 4. In addition, the case where the same control is performed for any of the front and rear sides of the passenger compartment 51 has been described so far (see the broken-line rectangle ForR in FIG. 1B-2). For example, when the user is seated, different control may be performed on the rear speaker.

  Specifically, for the listener 200 seated in the front, the arrival sound from the rear speaker contributes to a sense of sound expansion, and therefore, a reverberation component with respect to the arrival sound from the rear in order to further emphasize the sound expansion. May be output from the R speaker 13 and the L speaker 14 behind the passenger compartment 51.

  In such a case, depending on the R speaker 13 and the L speaker 14 in front of the passenger compartment 51, the sound image can be satisfactorily localized for a plurality of listeners, while the rear R speaker 13 and the L speaker 14 may sound to the listener 200. A feeling of spreading can be given. Details of the case where such a reverberation component is applied will be described later with reference to FIGS.

  Thus, according to the sound image localization method according to the present invention, the phase of the synthesized wave S is changed by “shifting” the phases of the R signal output from the R speaker 13 and the L signal output from the L speaker 14. Since the adjustment is made so that the two ears of the listener 200 are in phase, the sound images can be localized with respect to a plurality of listeners.

  In addition, when the listener 200 is seated only in front of the passenger compartment 51, the reverberation component is added to the output signal of the rear speaker, so that sound images can be localized well for a plurality of listeners. It is possible to give the listener 200 a feeling of sound expansion.

  In the following, first to fifth embodiments of the in-vehicle audio apparatus and the in-vehicle audio system to which the sound image localization method described with reference to FIG. 1 is applied will be described in order. In the first embodiment, a basic configuration for “phase-shifting” the L signal and the R signal, respectively, and in the second embodiment, a configuration for generating a monaural signal based on the low frequency band of the L signal and the R signal is implemented. Each case of adding to the configuration of Example 1 will be described.

  In the third embodiment, the configuration for adding the reverberation component to the signal for the rear speaker is added to the configuration of the first embodiment. In the fourth embodiment, the configurations of the second and third embodiments are combined. Each will be explained. In the fifth embodiment, a configuration in which parameter information used for “phase shift” or the like is acquired from the management apparatus will be described.

  In the first embodiment, a basic configuration for “phase-shifting” each of the L signal and the R signal will be described. First, a configuration example of the in-vehicle audio apparatus 1 according to each of the following embodiments including the first embodiment. Will be described with reference to FIG.

  FIG. 2 is a diagram illustrating a configuration example of the in-vehicle audio device 1. As shown in FIG. 2, the in-vehicle audio apparatus 1 includes an acoustic source 2, an R amplifier 3, an L amplifier 4, a microcomputer 5, a display 6, an operation unit 7, a selector 9, and a DSP (Digital Signal). Processor) 10. Further, an R speaker 13 and an L speaker 14 are arranged outside.

  The acoustic source 2 is a group of acoustic devices such as an FM tuner, an AM tuner, or a CD player. The acoustic source 2 is controlled by the microcomputer 5. The R amplifier 3 is a device that amplifies an R signal input from the DSP 10 described later and outputs the amplified signal to the R speaker 13. Similarly, the L amplifier 4 is a device that amplifies the L signal input from the DSP 10 and outputs the amplified L signal to the L speaker 14.

  The microcomputer 5 is a central control unit that controls the in-vehicle audio apparatus 1 as a whole, receives an instruction request from each unit such as the selector 9 and the DSP 10, and notifies a control signal corresponding to the instruction request. The microcomputer 5 may be configured by a plurality of units that are differentiated for each function. In the following description, it is assumed that the microcomputer 5 is a single unit.

  The display 6 is an output device that displays various display information to the operator. The operation unit 7 is an operation component that receives an input operation of the operator. Such operation parts include not only hard switches such as dials and buttons but also soft switches such as buttons displayed on the display 6.

  The selector 9 is a device that selects a specific acoustic source from the acoustic sources 2 based on a switching request from the microcomputer 5 and outputs the R signal and the L signal of the selected acoustic source to the DSP 10.

  The DSP 10 is a microprocessor that performs sound image localization processing of the R signal and L signal of the sound source 2 input via the selector 9. Further, the DSP 10 outputs the R signal and the L signal subjected to the sound image localization processing to the R amplifier 3 and the L amplifier 4.

  The DSP 10 can perform not only the sound image localization process but also various digital signal processes related to the acoustic signal. Hereinafter, the DSP 10 will be described specifically for the sound image localization process. Details of the DSP 10 will be described later.

  The R speaker 13 is an output device that converts the R signal input from the R amplifier 3 into physical vibration and outputs it as sound. Similarly, the L speaker 14 is an output device that outputs the L signal input from the L amplifier 4 as sound.

  The structures of the R speaker 13 and the L speaker 14 are not limited as long as they are devices that can convert an electrical signal into sound and output the sound. That is, a cone speaker may be used, or a ceramic speaker or an exciter may be used.

  Next, a configuration example of the DSP 10 that performs sound image localization processing will be described with reference to FIG. FIG. 3 is a block diagram illustrating the configuration of the DSP 10 according to the first embodiment. In FIG. 3, only components necessary for explaining the features of the DSP 10 are shown, and descriptions of general components are omitted.

  As shown in FIG. 3, the DSP 10 includes a control unit 15 and a storage unit 16. The control unit 15 further includes a phase adjustment unit 15a. And the memory | storage part 16 memorize | stores the phase shift information 16aa.

  The control unit 15 is a processing unit that performs sound image localization processing by phase adjustment of the R signal and the L signal input from the selector 9 (see FIG. 2).

  The phase adjustment unit 15a adjusts so that the phase of the synthesized wave S (see FIG. 1) between both ears of the listener 200 is only in phase by “shifting” each of the input R signal and L signal. It is a processing part which performs the process to perform.

  The “phase shift” is performed using an R signal phase shifter 15aa and an L signal phase shifter 15ab included in the phase adjustment unit 15a. Details of the phase shifter 15aa or the phase shifter 15ab will be described later with reference to FIG.

  In addition, the phase adjustment unit 15a sends the adjusted R signal to the R speaker 13 outside the in-vehicle audio apparatus 1 via the R amplifier 3 outside the DSP 10, and the adjusted L signal via the L amplifier 4 outside the DSP 10 in the same manner. Thus, the process of outputting to the L speaker 14 outside the in-vehicle audio apparatus 1 is also performed.

  The storage unit 16 is a storage unit configured by a storage device such as a nonvolatile memory or a register, and stores the phase shift information 16aa.

  The phase shift information 16aa is parameter information related to “phase shift” that determines the characteristics of the phase shifter 15aa and the phase shifter 15ab. Such parameter information includes a delay value of a delay device included in each of the phase shifter 15aa and the phase shifter 15ab, a gain value of an amplifier, and the like.

  Next, details of the phase adjustment processing in the phase adjustment unit 15a shown in FIG. 3 will be described with reference to FIG. FIG. 4 is a diagram for explaining the phase adjustment processing in the phase adjustment unit 15a. 4A shows a circuit example of the phase shifter 15aa or the phase shifter 15ab, and FIG. 4B shows a difference in phase characteristics depending on parameters.

  As shown in FIG. 4A, the phase shifter 15aa or the phase shifter 15ab included in the phase adjustment unit 15a is implemented with an infinite impulse response (hereinafter referred to as “IIR”) filter. be able to. That is, by configuring a feedback path and a forward path with a plurality of delay devices and amplifiers, high-performance signal processing with a small number of operations can be performed.

  In addition, the phase adjustment unit 15a sets individual delay values and gain values for each delay unit and each amplifier included in the phase shifter 15aa or the phase shifter 15ab, so that the phase shifter 15aa and the phase shifter are set. Each of 15ab is caused to perform a different phase change.

  Note that the individual delay value and gain value are included in the phase shift information 16aa, and the phase adjustment unit 15a refers to the phase shift information 16aa, and each of the phase shifter 15aa and the phase shifter 15ab individually. It will give the characteristics.

  Thereby, as shown in FIG. 4B, an arbitrary “phase difference” can be given between the R signal and the L signal in an arbitrary frequency band. It is also possible to “phase shift” only in the low frequency band, which is said to be a factor that tends to bias the sound image localization.

  That is, the phase adjustment unit 15a performs a phase adjustment process for adding a “phase difference” so that the phase of the synthesized wave S (see FIG. 1) between both ears of the listener 200 is only in phase.

  Therefore, each delay value and each gain value of the phase shift information 16aa are set so that the center frequency and the Q value in the phase change by each of the phase shifter 15aa and the phase shifter 15ab are optimum at each seating position. That is, it is adjusted in a verification experiment of the development process of the DSP 10 and stored in the storage unit 16 in advance so that the phase of the synthesized wave S between both ears of the listener 200 is only in phase.

  The delay values and the gain values are adjusted by adjusting the distance between the speakers arranged on the left and right in the width direction of the passenger compartment 51, the distance between the ears of the listener 200 and the speakers, and the arrangement patterns of a plurality of seating positions. Therefore, it is preferable to carry out verification so as to obtain an appropriate value for each combination of vehicle type and audio configuration.

  Further, the phase shift information 16aa including each delay value and each gain value may be appropriately adjusted according to end user preference, change in audio configuration, replacement of the DSP 10, or the like. For example, the end user may directly adjust from the operation unit 7 included in the vehicle-mounted audio device 1 or may be acquired from a management device or the like. Examples obtained from the management apparatus will be described later with reference to FIGS.

  Further, regarding the adjustment of the phase shift information 16aa, it is possible to reduce the deterioration of sound quality by performing an adjustment that changes only the phase characteristic of the input signal and does not change the frequency characteristic. Such a point can also be dealt with by designing the phase shifter 15aa or the phase shifter 15ab that changes only the phase characteristics.

  Here, the phase shifter 15aa or the phase shifter 15ab implemented by the IIR filter has been described as an example, but the present invention is not limited to the IIR filter, and a finite impulse response (Finite Impulse Response; hereinafter, “ It may be implemented by a filter (described as “FIR”).

  Next, a processing procedure executed by the DSP 10 according to the first embodiment will be described with reference to FIG. FIG. 5 is a flowchart illustrating a processing procedure of processing executed by the DSP 10 according to the first embodiment.

  As shown in FIG. 5, the phase adjustment unit 15 a of the DSP 10 includes information on “phase shift” for the L signal and the R signal from the phase shift information 16 aa in the initial operation stage of the in-vehicle audio apparatus 1 due to power-on or the like. (In other words, the delay value of the delay device, the gain value of the amplifier, etc.) are read (step S101).

  Then, the phase adjustment unit 15a individually sets the characteristics of the phase shifter 15aa and the phase shifter 15ab so that a phase difference is generated due to the phase change based on the read information regarding the individual “phase shift”. The phase shifter 15aa and the phase shifter 15ab are used to “phase shift” the L signal and the R signal, respectively (step S102).

  Then, the phase adjustment unit 15a outputs the L signal and the R signal after the “phase shift” (Step S103), and ends the process. In the following, the processing procedure from step S101 to step S103 shown in FIG. 5 is referred to as “phase adjustment processing”.

  As described above, in the first embodiment, the phase adjustment unit performs “phase shift” on the L signal and the R signal, respectively, so that the combined wave based on the outputs of the speakers arranged on the left and right in the width direction of the passenger compartment. The in-vehicle audio device DSP is configured so that the phase of the in-phase is the same between the ears of the listener corresponding to the seating position. Therefore, a sound image can be localized with respect to a plurality of listeners.

  By the way, in the first embodiment described above, the case where each of the input L signal and R signal is “phase-shifted” as it is has been described. However, it is also possible to generate a monaural signal, which is generally said to have a sense of sound image localization, based on the L signal and R signal, and then to “phase shift” the monaural signal. Therefore, in a second embodiment described below, such a case will be described.

  In the second embodiment, a case where a configuration for generating a monaural signal based on the low frequency band of the L signal and the R signal is added to the configuration of the first embodiment will be described. FIG. 6 is a block diagram illustrating the configuration of the DSP 10a according to the second embodiment. In FIG. 6, the same components as those of the DSP 10 according to the first embodiment shown in FIG. 3 are denoted by the same reference numerals. In the following description, the same components as those of the first embodiment described above are described. It will be omitted or simply explained.

  As shown in FIG. 6, the DSP 10a according to the second embodiment is related to the first embodiment described above in that the control unit 15 further includes a band dividing unit 15b, a monaural signal generating unit 15c, and an adding unit 15d. It is different from DSP10.

  The band dividing unit 15b is a processing unit that performs a process of dividing each of the input L signal and R signal into a low frequency band and a high frequency band. For such band division, a low-pass filter (hereinafter referred to as “LPF”), a high-pass filter (hereinafter referred to as “HPF”), or the like can be used. The division frequency is preferably around 600 Hz.

  Further, the band dividing unit 15b performs processing for outputting the L signal and the R signal for the low frequency band to the monaural signal generating unit 15c, and the L signal and the R signal for the high frequency band to the adding unit 15d, respectively. Perform together.

  The monaural signal generation unit 15c adds the L signal and the R signal for the low frequency band input from the band dividing unit 15b, generates a monaural signal, amplifies the signal, and outputs it to the phase adjustment unit 15a. It is a processing part to perform.

  Here, unlike the case of the first embodiment, when the monaural signal is input from the monaural signal generation unit 15c, the phase adjusting unit 15a according to the second embodiment branches the monaural signal and then branches one of the branched signals. “Phase shift” for the L signal and the other “phase shift” for the R signal.

  Hereinafter, a monaural signal “phase-shifted” for the L signal will be referred to as an “L signal component”, and a monaural signal “phase-shifted” for the R signal will be referred to as an “R signal component”.

  The phase adjustment unit 15a also performs a process of outputting the L signal component and the R signal component to the addition unit 15d.

  The adding unit 15d adds the L signal component input from the phase adjusting unit 15a and the L signal for the high frequency band input from the band dividing unit 15b, and synthesizes the L signal for the external L speaker 14. A processing unit that performs processing.

  Similarly, the adding unit 15d adds the R signal component input from the phase adjusting unit 15a and the R signal for the high frequency band input from the band dividing unit 15b, so that the R signal for the external R speaker 13 is added. The process to synthesize is also performed. In this way, by adding the L signal and the R signal for the high frequency band, a stereo component can also be imparted while obtaining a sense of stability of sound image localization by monauralization.

  The adder 15d outputs the combined L signal to the L speaker 14 via the external L amplifier 4 and outputs the combined R signal to the R speaker 13 via the external R amplifier 3 respectively. Is also performed.

  Next, a processing procedure executed by the DSP 10a according to the second embodiment will be described with reference to FIG. FIG. 7 is a flowchart illustrating a processing procedure of processing executed by the DSP 10a according to the second embodiment.

  As shown in FIG. 7, first, the band dividing unit 15b divides the input L signal and R signal into a low frequency band and a high frequency band, respectively (step S201). Then, the monaural signal generation unit 15c generates a monaural signal for the divided low frequency band (step S202).

  Then, the phase adjustment unit 15a reads information on “phase shift” for the L signal and the R signal from the phase shift information 16aa (step S203). Note that such reading may be performed at an initial operation stage of the in-vehicle audio apparatus 1 by power-on or the like.

  Then, the phase adjustment unit 15a individually sets the characteristics of the phase shifter 15aa and the phase shifter 15ab so that a phase difference is generated due to the phase change based on the read information regarding the individual “phase shift”. Using the phase shifter 15aa and the phase shifter 15ab, the L signal component and the R signal component are respectively “phase shifted” (step S204).

  Then, the adding unit 15d combines the L signal component and the R signal component after the “phase shift” with the L signal and the R signal for the divided high frequency band (step S205), and the combined L signal And R signal are output (step S206), and the process is terminated. Hereinafter, the processing procedure from step S201 to step S206 shown in FIG. 7 will be referred to as “monaural phase adjustment processing”.

  As described above, in the second embodiment, the band division unit divides the input L signal and R signal into the low frequency band and the high frequency band, respectively, and the monaural signal generation unit uses the divided low signal. A monaural signal is generated based on the frequency band, the phase adjustment unit “phase shifts” the L signal component and the R signal component based on the monaural signal, and the addition unit performs the L signal component after “phase shifting”. The DSP of the in-vehicle audio apparatus is configured to add the R signal component and the L signal and R signal for the high frequency band.

  Therefore, a sound image can be localized with respect to a plurality of listeners. In addition, a stereo component can be added while obtaining a sense of stability of sound image localization by monauralization.

  By the way, in the above-described first and second embodiments, the case where the same control regarding the sound image localization is performed in the front and rear of the passenger compartment 51 (see the broken rectangles F and R in FIG. 1) has been described. However, when the listener 200 is seated only in front of the passenger compartment 51, the rear speaker may be controlled differently. Therefore, in a third embodiment shown below, such a case will be described.

  In the third embodiment, a case where a configuration for adding a reverberation component to a signal for a rear speaker is added to the configuration of the first embodiment will be described. FIG. 8 is a block diagram illustrating the configuration of the DSP 10b according to the third embodiment. In FIG. 8, the same components as those of the DSP 10 according to the first embodiment shown in FIG. 3 are denoted by the same reference numerals. In the following description, the same components as those of the first embodiment are described. It will be omitted or simply explained.

  As shown in FIG. 8, the DSP 10b according to the third embodiment outputs the FR speaker 13a and the FL speaker 14a that are the front speakers of the passenger compartment 51, and the RR speaker 13b and the RL speaker 14b that are also the rear speakers. And

  Here, the FR speaker 13a is an output device that is disposed on the front right side of the passenger compartment 51 and outputs the R signal after “phase shift” output from the phase adjustment unit 15a as sound. Similarly, the FL speaker 14a is an output device that is disposed on the front left side of the passenger compartment 51 and that outputs an L signal after “phase shift” output from the phase adjustment unit 15a as sound.

  The RR speaker 13b is an output device that is disposed on the right rear side of the passenger compartment 51 and outputs the R signal after the reverberation component output from the reverberation applying unit 15e as sound. Similarly, the RL speaker 14b is an output device that is disposed on the rear left side of the passenger compartment 51 and outputs the L signal after the reverberation component output from the reverberation applying unit 15e as sound. Each speaker is arranged outside the in-vehicle audio apparatus 1.

  The FR amplifier 3a corresponds to the FR speaker 13a, the FL amplifier 4a corresponds to the FL speaker 14a, the RR amplifier 3b corresponds to the RR speaker 13b, and the RL amplifier 4b corresponds to the RL speaker 14b. It is arranged inside the in-vehicle audio apparatus 1.

  As shown in FIG. 8, the DSP 10b according to the third embodiment is different from the DSP 10 according to the first embodiment described above in that the control unit 15 further includes a reverberation adding unit 15e, and the storage unit 16 further includes reverberation adding information 16ab. .

  The reverberation imparting unit 15e performs a process of giving a reverberation component that produces a sense of sound spread to each of the input R signal and L signal, and then outputting the reverberation component to the rearward RR speaker 13b and the RL speaker 14b. Part.

  The reverberation adding unit 15e can apply a reverberation component by using an FIR filter or the like. Details of this point will be described later with reference to FIGS. 9A to 9C.

  The reverberation imparting information 16ab in the storage unit 16 is information regarding parameters for imparting reverberation components such as a filter coefficient included in the reverberation imparting unit 15e.

  Here, details of the reverberation imparting process in the reverberation imparting unit 15e will be described with reference to FIGS. 9A, 9B, and 9C. 9A is a diagram for explaining the reverberation imparting process in the reverberation imparting unit 15e, FIG. 9B is a diagram for explaining the reverberation imparting process in the reverberation imparting unit 15e, and FIG. 9C is the reverberation imparting unit 15e. FIG. 6 is a third diagram for explaining the reverberation imparting process in FIG.

  As shown in FIG. 9A, the reverberation imparting unit 15e can be implemented with an FIR filter. In other words, a reverberation component can be added to the input signal by convolution while amplifying the delay results of the plurality of delay units with an amplifier.

  At this time, the reverberation component imparted by the reverberation imparting unit 15e can be determined by the reverberation imparting information 16ab described above. For example, the reverberation imparting information 16ab can include a filter coefficient such as a delay value of a delay unit and a gain value of an amplifier included in the reverberation imparting unit 15e.

  When the reverberant sound is gradually attenuated, a signal attenuation curve or the like prepared according to the environment of the passenger compartment 51 may be included in the reverberation imparting information 16ab in advance.

  Alternatively, a target reverberation characteristic (for example, a reverberation characteristic of a listening room) may be determined in advance, and the reverberation imparting information 16ab may be set or adjusted so that the target reverberation characteristic can be reproduced in a pseudo manner.

  Although an example using the FIR filter is given here, an IIR filter may be used, or another method may be used.

  For example, as shown in FIG. 9B, the reverberation imparting unit 15e may consider that the reverberation component is imparted by reducing the correlation between the L signal and the R signal. That is, by performing the process of reducing the correlation between the L signal and the R signal, the feeling of spread felt by the listener can be strengthened, and the same effect as adding the reverberation component can be obtained.

  Specifically, as illustrated in FIG. 9B, the L signal and the R signal are each branched into two systems, and the independent component generation unit 152 is configured for one system (hereinafter referred to as “main system”). Delay by the provided delay device. For the other system, the common component extraction unit 151 extracts common components having high correlation in the L signal and the R signal.

  Note that the delay in the main system is performed in order to match the delay occurring in the process in the common component extraction unit 151 on the time axis.

  Here, the common component extraction processing in the common component extraction unit 151 will be described. The common component extraction unit 151 generates a common component based on a complex signal including a real part and an imaginary part.

  As illustrated in FIG. 9B, the common component extraction unit 151 includes an orthogonalization unit 151a, a correlation coefficient calculation unit 151b, an LPF 151c, and a common component generation unit 151d.

  The orthogonalizing unit 151a converts the L signal and the R signal into a complex signal including a real part and an imaginary part. Here, the conversion to a complex signal can be performed using Hilbert transform, FFT (Fast Fourier Transform), or the like. FIG. 9B shows an example of Hilbert transform using an orthogonalization filter and a delay circuit. Further, the orthogonalization unit 151a outputs the real part component (Re) and the imaginary part (Im) component of the converted complex signal to the correlation coefficient calculation unit 151b.

  The correlation coefficient calculation unit 151b calculates the correlation coefficient (α) using the real part component (Re) and the imaginary part (Im) component of the L and R signals received from the orthogonalization unit 151a. Then, the calculated correlation coefficient (α) is smoothed by the LPF 151c, and the smoothed correlation coefficient (α ′) is output to the common component generation unit 151d.

  The common component generation unit 151d generates a common component using the real component (Re) of the L signal and the R signal received from the orthogonalization unit 151a and the smoothed correlation coefficient (α ') received from the LPF 151c. To do. In addition, the common component generation unit 151 d outputs the generated common component to the independent component generation unit 152.

  Then, the independent component generation unit 152 subtracts the common component extracted by the common component extraction unit 151 from the L signal and the R signal of the main system to obtain independent components “L ′” and “ R ′ ”is generated. The subtraction amount of the extracted common component may be adjusted by arranging an amplifier after extracting the common component.

  The independent components “L ′” and “R ′” are output instead of the L signal and the R signal. Thereby, it is possible to give the listener a sense of sound expansion.

  In addition, since the correlation between the L signal and the R signal only needs to be low in order to give a sense of sound expansion, the L signal and R signal of the main system are adjusted after adjusting “L ′” and “R ′” with an amplifier. You may add to a signal.

  Specifically, as illustrated in FIG. 9C, the independent component generation unit 152 subtracts the common components from the L signal and the R signal branched from the main system to obtain the independent components “L ′” and “R ′”. Generate. In order to give a sense of spread, the independent components “L ′” and “R ′” are delayed with respect to the main system via a delay device, adjusted by an amplifier, and then the L signal and R of the main system. Add to signal.

  With the method of subtracting from the main system signal, there is a concern about sound quality degradation due to calculation accuracy, but it is possible to give the listener a sense of sound expansion while suppressing sound quality degradation due to calculation accuracy. Become.

  Next, a processing procedure executed by the DSP 10b according to the third embodiment will be described with reference to FIG. FIG. 10 is a flowchart illustrating a processing procedure of processing executed by the DSP 10b according to the third embodiment.

  As shown in FIG. 10, the phase adjustment unit 15 a performs “phase adjustment processing” (see FIG. 5) for the signal for the “front” speaker (step S <b> 301).

  In addition, for the signal for the “rear” speaker, the reverberation imparting unit 15e reads various parameter information related to the application of the reverberation component from the reverberation imparting information 16ab (step S302). Note that such reading may be performed at an initial operation stage of the in-vehicle audio apparatus 1 by power-on or the like.

  And the reverberation provision part 15e provides a reverberation component to L signal and R signal based on the various parameters of the read reverberation provision information 16ab (step S303).

  And the reverberation provision part 15e outputs the L signal and R signal after reverberation component provision toward a back speaker (step S304), and complete | finishes a process. Hereinafter, the processing procedure from step S302 to step S304 illustrated in FIG. 10 will be referred to as “reverberation imparting processing”.

  As described above, in the third embodiment, the phase adjusting unit “phase-shifts” each of the input L signal and R signal, and outputs them to the loudspeaker in front of the passenger compartment. The DSP of the in-vehicle audio apparatus is configured so that a reverberation component is applied to each of the L signal and the R signal and output to a speaker behind the passenger compartment. Therefore, it is possible to give a sense of sound expansion to a plurality of listeners while favorably localizing the sound image.

  By the way, in the above-described second embodiment, the case where the configuration for generating a monaural signal based on the low frequency bands of the L signal and the R signal is added to the configuration of the first embodiment has been described. Further, in the above-described third embodiment, a case has been described in which a configuration for adding a reverberation component to a signal for a rear speaker is added to the configuration of the first embodiment.

  Here, the configurations of the second embodiment and the third embodiment may be combined. Therefore, in a fourth embodiment shown below, such a case will be described.

  In the fourth embodiment, a case where the configurations of the second and third embodiments are combined will be described. FIG. 11 is a block diagram illustrating the configuration of the DSP 10c according to the fourth embodiment. In FIG. 11, the same components as those of the DSP 10a according to the second embodiment shown in FIG. 6 and the DSP 10b according to the third embodiment shown in FIG. The description of the same constituent elements as those of the second embodiment and the third embodiment described above is omitted or only a brief description.

  As illustrated in FIG. 11, the DSP 10 c according to the fourth embodiment branches each of the input L signal and R signal into a system for the front of the passenger compartment 51 and a system for the rear of the passenger compartment 51.

  For the forward system, as in the second embodiment, the monaural signal generation unit 15c generates a monaural signal based on the low frequency band, and the phase adjustment unit 15a "phases" the monaural signal. .

  Then, after adding the high frequency band to the L signal component and the R signal component after the “phase shift”, the signal is output toward the FR speaker 13a and the FL speaker 14a in front of the passenger compartment 51.

  On the other hand, with respect to the backward system, as in the third embodiment, after applying a reverberation component in the reverberation applying unit 15e, the reverberation is output to the RR speaker 13b and the RL speaker 14b.

  Thereby, a stereo component can also be provided while obtaining a sense of stability of sound image localization by monauralization. Furthermore, it is possible to give the listener a sense of sound expansion.

  Next, a processing procedure executed by the DSP 10c according to the fourth embodiment will be described with reference to FIG. FIG. 12 is a flowchart illustrating the processing procedure of the processing executed by the DSP 10c according to the fourth embodiment.

  As shown in FIG. 12, the DSP 10c performs the “monaural phase adjustment process” (see FIG. 7) for the signal for the “front” speaker (step S401).

  For the signal for the “rear” speaker, the DSP 10c performs the “reverberation process” (see FIG. 10) (step S402) and ends the process.

  As described above, in the fourth embodiment, the band division unit divides the input L signal and R signal into the low frequency band and the high frequency band, respectively, and the monaural signal generation unit uses the divided low signal. A monaural signal is generated based on the frequency band, the phase adjustment unit “phase shifts” the L signal component and the R signal component based on the monaural signal, and the addition unit performs the L signal component after “phase shifting”. The DSP of the in-vehicle audio apparatus is configured so that the R signal component and the L signal and R signal for the high frequency band are added and output to the speaker in front of the passenger compartment.

  In addition, the in-vehicle audio device DSP is configured such that the reverberation imparting unit imparts reverberation components to the input L signal and R signal, respectively, and outputs the reverberation components to the speakers behind the passenger compartment. Therefore, a sound image can be localized with respect to a plurality of listeners. In addition, a stereo component can be added while obtaining a sense of stability of sound image localization by monauralization. Furthermore, it is possible to give the listener a sense of sound expansion.

  By the way, in the above-described first to fourth embodiments, the case where parameter information relating to “phase shift” and reverberation component addition is stored in advance in the in-vehicle audio apparatus has been described. However, the parameter information may be set by appropriately downloading from the management device or the like. Therefore, in a fifth embodiment shown below, this case will be described.

  In the fifth embodiment, an in-vehicle audio system in which the in-vehicle audio device can acquire parameter information used for “phase shift” and reverberation component addition from a management device will be described. FIG. 13 is a block diagram illustrating the configuration of the in-vehicle audio system according to the fifth embodiment. In FIG. 13, the same components as those in the in-vehicle audio apparatus 1 shown in FIG. 2 are denoted by the same reference numerals, and the description of the overlapping components will be omitted or briefly described below. I will keep it.

  As shown in FIG. 13, the in-vehicle audio apparatus 1 of the in-vehicle audio system according to the fifth embodiment includes a communication I / F (interface) 8 that is a wireless communication device, and is managed via the communication I / F 8. Data is transmitted to and received from the apparatus 100.

  The microcomputer 5 includes a display control unit 5a, a request transmission unit 5b, and a parameter information acquisition unit 5c. The display control unit 5 a is a processing unit that performs display control of an operation screen related to parameter information acquisition displayed on the display 6 and an acquisition result.

  The operation unit 7 corresponds to an operation component such as a soft switch displayed on the display 6 and accepts a parameter information acquisition request operation from the operator.

  The request transmission unit 5b is a processing unit that performs processing for notifying the request reception unit 102a of the management apparatus 100 of the parameter information acquisition request received from the operation unit 7 via the communication I / F 8.

  The parameter information acquisition unit 5c acquires parameter information notified from the parameter information notification unit 102b of the management apparatus 100 via the communication I / F 8, and notifies the DSPs 10, 10a to 10c according to the first to fourth embodiments. Is a processing unit.

  Note that the DSPs 10, 10a to 10c store the notified parameter information as the above-described phase shift information 16aa or reverberation imparting information 16ab. The parameter information acquisition unit 5c also performs a process of notifying the display control unit 5a of the parameter information acquisition result.

  Although not shown, the microcomputer 5 is composed of a control unit and a storage unit, and the control unit includes a display control unit 5a, a request transmission unit 5b, and a parameter information acquisition unit 5c. The acquired parameter information may be stored in the storage unit of the microcomputer 5. In such a case, the DSPs 10, 10a to 10c may load parameter information from the storage unit of the microcomputer 5 in the initial operation stage accompanying power-on or the like.

  Next, the management apparatus 100 will be described. As illustrated in FIG. 13, the management apparatus 100 includes a communication I / F (interface) 101, a control unit 102, and a storage unit 103. The control unit 102 further includes a request reception unit 102a and a parameter information notification unit 102b. And the memory | storage part 103 memorize | stores the parameter information 103a containing the phase shift information 103aa and the reverberation provision information 103ab.

  The communication I / F 101 is a wireless communication device, and performs data transmission / reception between the management apparatus 100 and the in-vehicle audio apparatus 1. The control unit 102 is a processing unit that performs processing of receiving parameter information acquisition requests from the in-vehicle audio device 1, extracting parameter information according to the request, and notifying the in-vehicle audio device 1.

  The request reception unit 102a is a processing unit that performs processing for receiving a parameter information acquisition request notified from the request transmission unit 5b of the in-vehicle audio device 1 via the communication I / F 101. The request receiving unit 102a also performs a process of notifying the parameter information notifying unit 102b of the received parameter information acquisition request.

  The parameter information notification unit 102b is a processing unit that performs processing for extracting parameter information corresponding to the request from the parameter information 103a in the storage unit 103 based on the parameter information acquisition request notified from the request reception unit 102a.

  The parameter information notification unit 102b also performs a process of notifying the extracted parameter information to the parameter information acquisition unit 5c of the in-vehicle audio device 1 via the communication I / F 101.

  The parameter information 103a is parameter information relating to “phase shift” used by the DSPs 10, 10a to 10c of the in-vehicle audio apparatus 1 and the application of reverberation components. The phase shift information 103aa is information regarding “phase shift” corresponding to the phase shift information 16aa of the DSPs 10, 10a to 10c. Similarly, the reverberation imparting information 103ab is information corresponding to the reverberation imparting information 16ab.

  Note that the phase shift information 103aa or the reverberation imparting information 103ab includes the distance between speakers arranged on the left and right in the width direction of the passenger compartment 51, the distance between the listener's ear and the speaker, and the arrangement pattern of a plurality of seating positions. It is assumed that the information is classified by manufacturer, vehicle type, and audio configuration, adjusted through verification experiments that take influence into account.

  Next, a specific example of parameter information acquisition operation in the in-vehicle audio system according to the fifth embodiment will be described with reference to FIG. FIG. 14 is a diagram illustrating an example of an operation for acquiring parameter information. 14A shows a schematic diagram of the in-vehicle audio apparatus 1, and FIG. 14B shows a specific operation example.

  As shown in FIG. 14A, the in-vehicle audio apparatus 1 includes a display 6. Further, a plurality of hard switches 40 can be provided in the vicinity of the display 6.

  The hard switch 40 is a hardware operation component such as a button or a dial. Although not shown in the figure, a character string indicating the role of each operation component such as “setting” and “volume” is generally attached to the hard switch 40 and its vicinity.

  On the display 6, software-operated parts such as menus and software switches 30 are displayed. FIG. 14A shows a case where “sound setting menu” is displayed as a menu. The operation components such as the soft switch 30 and the hard switch 40 described above correspond to the operation unit 7 of the in-vehicle audio apparatus 1.

  Here, as shown in FIG. 14A, the operator can move to the parameter information acquisition request operation screen by touching the “download” item of the “sound setting menu”.

  Next, FIG. 14B is a display example of the parameter information acquisition request operation screen. Here, as an example of the “acoustic adjustment parameter download” screen, an example is shown in which parameter information is narrowed down for each “maker”, “vehicle type”, and “grade” of the audio configuration.

  For example, in FIG. 14B, “Manufacturer”, “Vehicle type”, and “Grade” are provided with black triangle icons, and by touching the black triangle icon, a selection menu for each category is displayed. Is displayed (see (B-1) in the figure).

  In such a case, after selecting “AAA” as the “maker”, the operator selects “BBB” that is the “vehicle type” of the “AAA” manufacturer, and the “grade” in the vehicle type “BBB” is set to “CCC” or “DDD” or the like can be selected (see (B-2) in the figure).

  If the operator selects, for example, “CCC” and touches the “download” button (see (B-3) in the figure), the in-vehicle audio device 1 is the “AAA” manufacturer. The parameter information acquisition request of grade “CCC” related to the vehicle type “BBB” is notified to the management apparatus 100.

  Although not shown, if the parameter information corresponding to the parameter information acquisition request can be acquired, it is preferable to display the acquisition result in the “current set value” column shown in FIG.

  By providing such a user interface, it goes without saying that the in-vehicle audio apparatus 1 is in the initial state, and the operator changes the audio configuration (for example, addition of speakers) or the in-vehicle audio apparatus 1. Parameter information corresponding to the acoustic environment can be appropriately acquired.

  That is, it is possible to perform sound image localization control in accordance with the acoustic environment of the passenger compartment 51 while improving user convenience.

  Next, a processing procedure executed by the vehicle-mounted audio system according to the fifth embodiment will be described with reference to FIG. FIG. 15 is a flowchart illustrating a processing procedure of processing executed by the vehicle-mounted audio system according to the fifth embodiment.

  As shown in FIG. 15, parameter information acquisition request (hereinafter referred to as “download request”) operation by the operator via the operation screen displayed and controlled by the display control unit 5 a of the microcomputer 5 of the in-vehicle audio apparatus 1. Is received (step S501).

  If a download request operation is received, the request transmission unit 5b of the microcomputer 5 notifies the download request to the request reception unit 102a of the management apparatus 100 (step S502).

  In the management apparatus 100, the request reception unit 102a receives the download request (step S503), and notifies the parameter information notification unit 102b of the received request. Then, the parameter information notification unit 102b extracts the parameter information corresponding to the download request from the parameter information 103a of the storage unit 103 (step S504), and notifies the extracted parameter information to the parameter information acquisition unit 5c of the microcomputer 5 (step S504). S505).

  In the in-vehicle audio apparatus 1, the parameter information acquisition unit 5c of the microcomputer 5 acquires the parameter information extracted by the management apparatus 100 (step S506) and notifies the DSP 10, 10a to 10c.

  Then, the DSPs 10, 10a to 10c of the in-vehicle audio apparatus 1 perform acoustic adjustment such as “phase shift” and reverberation component addition based on the notified parameter information (step S507), and the process is terminated.

  As described above, in the fifth embodiment, when an operator parameter information acquisition request is received, the request transmission unit of the microcomputer notifies the acquisition request to the management device, and the parameter information notification unit of the management device starts. The parameter information corresponding to the acquisition request is extracted and notified, and the parameter information acquisition unit of the microcomputer acquires the parameter information notified from the management device and notifies the DSP, and the DSP generates an L signal based on the parameter information. The in-vehicle audio system is configured to add “phase shift” or reverberation component to the R signal and the R signal, respectively. Therefore, it is possible to perform localization of sound images to a plurality of listeners while improving convenience and changing the acoustic environment of the passenger compartment.

  In the above-described fifth embodiment, the case where the parameter information related to the “phase shift” and the application of the reverberation component is acquired from the management apparatus has been described, but other parameters related to the acoustic environment of the vehicle compartment may be included as appropriate. .

  In the first to fifth embodiments described above, the case where the seating positions of two rows and four seats are provided in the passenger compartment has been mainly described, but the seat configuration is not limited thereto. Therefore, for example, the present invention can be applied to the case where the seating positions are provided over three rows or the case where the seating positions for three seats are provided in one row.

  As described above, the in-vehicle audio device and the in-vehicle audio system according to the present invention are useful when it is desired to localize sound images well for a plurality of listeners, and in particular, an optimal position for all the listeners. It is suitable for application to a high-quality car audio device or car audio system that can localize a sound image.

DESCRIPTION OF SYMBOLS 1 Car audio system 2 Sound source 3 R amplifier 3a FR amplifier 3b RR amplifier 4 L amplifier 4a FL amplifier 4b RL amplifier 5 Microcomputer 5a Display control part 5b Request transmission part 5c Parameter information acquisition part 6 Display 7 Operation part 8 Communication I / F
9 Selector 10, 10a-10c DSP
13 R speaker 13a FR speaker 13b RR speaker 14 L speaker 14a FL speaker 14b RL speaker 15 control unit 15a phase adjustment unit 15aa, 15ab phase shifter 15b band division unit 15c monaural signal generation unit 15d addition unit 15e reverberation addition unit 16 storage unit 16aa Phase shift information 16ab Reverberation information 30 Soft switch 40 Hard switch 50 Vehicle 51 Car compartment 100 Management device 101 Communication I / F
102 Control Unit 102a Request Reception Unit 102b Parameter Information Notification Unit 103 Storage Unit 103a Parameter Information 103aa Phase Shift Information 103ab Reverberation Information 151 Common Component Extraction Unit 151a Orthogonalization Unit 151b Correlation Coefficient Calculation Unit 151c LPF
151d Common component generator 152 Independent component generator 200 Listener

Claims (8)

An in-vehicle audio device that outputs sound from speakers arranged on the left and right sides of a passenger compartment,
An in-vehicle audio apparatus comprising phase adjusting means for adjusting a phase of a synthesized wave based on the output of the speaker to be in phase between both ears of a listener corresponding to each seating position. The phase adjusting means is
The in-vehicle audio apparatus according to claim 1, wherein the phase of the synthesized wave is adjusted to be in phase by changing the phase for each acoustic signal corresponding to the speaker. The phase adjusting means is
The in-vehicle audio apparatus according to claim 2, wherein a predetermined low frequency band in the acoustic signal is a target of phase change. The phase adjusting means is
The in-vehicle audio apparatus according to claim 2, wherein a monaural signal generated based on a predetermined low frequency band in the acoustic signal is a target of phase change. The phase adjusting means is
The acoustic signal corresponding to the speaker disposed in the front part of the passenger compartment is the target of phase change,
The vehicle-mounted vehicle according to any one of claims 1 to 4, further comprising reverberation applying means for applying a reverberation component to an acoustic signal corresponding to the speaker disposed at a rear portion of the vehicle compartment. Audio equipment. The reverberation imparting means includes
6. The in-vehicle audio apparatus according to claim 5, wherein the reverberation component is added by attenuating or completely removing a common component common between acoustic signals corresponding to the speakers from each acoustic signal. The reverberation imparting means includes
The reverberation component is generated by subtracting a common component common between the acoustic signals corresponding to the speakers from the respective outputs to generate independent components, and adding the independent components to the acoustic signals corresponding to the independent components, respectively. The in-vehicle audio apparatus according to claim 5, wherein An in-vehicle audio system that includes an in-vehicle audio device that outputs sound from speakers arranged on the left and right sides of a vehicle compartment, and a management device that is network-connected to the in-vehicle audio device,
The in-vehicle audio device is
Parameter information acquisition means for acquiring parameter information related to phase change processing of the output of the speaker in the vehicle on which the vehicle-mounted audio device is mounted, from the management device;
Based on the parameter information acquired by the parameter information acquisition means, the acoustic signal is adjusted so that the phase of the synthesized wave based on the output of the speaker is in phase between both ears of the listener corresponding to the sitting position. Phase adjusting means, and
The management device
An in-vehicle audio system comprising: parameter information providing means for providing the parameter information corresponding to the vehicle to the in-vehicle audio device.

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