WO2018012589A1

WO2018012589A1 - Acoustic system using musical instrument, acoustic method using musical instrument, acoustic device, and acoustic system

Info

Publication number: WO2018012589A1
Application number: PCT/JP2017/025546
Authority: WO
Inventors: 旭　保彦; 功紀早渕; 高橋　裕史; 賢一芝; 旬臼井
Original assignee: ヤマハ株式会社
Priority date: 2016-07-13
Filing date: 2017-07-13
Publication date: 2018-01-18
Also published as: JPWO2018012589A1; JP6658887B2

Abstract

This acoustic system is provided with a detection unit and a signal processing unit. The detection unit detects the position of a listener in the interior space of the vehicle. In accordance with the position of the listener detected by the detection unit, the signal processing unit processes an audio signal to be outputted to a speaker present in the interior space of the vehicle.

Description

Acoustic system using musical instrument, acoustic method using musical instrument, acoustic apparatus, and acoustic system

An embodiment of the present invention relates to a technique for adjusting sound output to an acoustic space in a vehicle.

Conventionally, an audio system for playing music in a room including a vehicle has been proposed.

Regarding the interior of an automobile, for example, in Japanese Patent Application Laid-Open No. 2006-109479, a) a sound source that generates an audio signal, b) a controller coupled to the sound source, and c) a first coupled to the controller. A plurality of transducers and d) a second plurality of transducers coupled to the controller, the controller in response to a user input in one of the first and second signal processing operations. Changing the signal, the first signal processing operation constitutes an audio signal for listening inside the vehicle, and the second signal processing operation constitutes an audio signal for listening outside the vehicle; The first plurality of transducers is driven by an audio signal configured to listen inside the vehicle by a first signal processing operation, and the second plurality of transducers are external to the vehicle by a second signal processing operation. By an audio signal configured to listen Car audio system, characterized in that it is dynamic is described.

JP 2006-109479 A

However, the listener in the car may be only the driver or there may be passengers other than the driver. Also, the audio source is not limited to a device such as a CD player that is previously installed in an automobile. The listener may listen to the sound in the vehicle using various devices such as a musical instrument, a microphone, a smartphone, a game device, or a toy, for example.

Therefore, there are various environments for listening to sounds in the vehicle, and it is desirable to adjust the sound appropriately according to the environment in the vehicle.

Therefore, an object of one embodiment of the present invention is to appropriately adjust sound according to the environment in the vehicle.

The acoustic device according to an embodiment of the present invention includes a detection unit and a signal processing unit. The detection unit detects the position of the listener in the vehicle interior space. The signal processing unit performs processing of a signal output to a speaker existing in the interior space according to the position of the listener detected by the detection unit.

The sound system can adjust the sound appropriately according to the environment in the car.

It is a perspective view of the electronic keyboard musical instrument which is an example of a musical instrument. It is a typical top view in the car concerning a 1st embodiment. It is a typical top view in the car concerning a 2nd embodiment. It is a block diagram which shows the structure of the acoustic system which concerns on 1st Embodiment. It is a flowchart which shows operation | movement of an acoustic system. It is a typical top view in the car concerning a 1st embodiment. 2 is a block diagram showing a configuration of a head unit 10. FIG. It is a typical top view in a car in an acoustic system concerning a 3rd embodiment. It is a flowchart which shows operation | movement of the acoustic system which concerns on 3rd Embodiment. It is a typical top view in a car in an acoustic system concerning modification 1. FIG. 11 is a block diagram showing a functional configuration of a DSP 17 in an acoustic system according to Modification Example 1. 10 is a flowchart illustrating an operation of an acoustic system according to Modification Example 1. FIG. 11 is a block diagram showing a functional configuration of a DSP 17 in an acoustic system according to modification example 2. 10 is a flowchart illustrating an operation of an acoustic system according to Modification Example 2. It is a typical top view in a car in an acoustic system concerning modification 4. FIG. 10 is a schematic plan view inside a vehicle in an acoustic system according to Modification Example 5.

First, the acoustic system according to the first embodiment will be described with reference to FIG. 1, FIG. 2, and FIG.

As shown in FIGS. 1, 2 and 4, the acoustic system according to the present invention basically includes a musical instrument 100, an input terminal 5, a speaker 1, a head unit 10 (AV amplifier, etc.), a monitor 20, and the like. It is composed of

The musical instrument 100 is desirably an electronic keyboard musical instrument that can be carried by making the housing 101 compact as shown in FIG. An output terminal (not shown) for outputting a signal, acoustic data, or the like is provided on the back surface 102 of the musical instrument 100 or the like. This output terminal is a USB terminal into which a USB (registered trademark, hereinafter abbreviated as a registered trademark) USB cable can be inserted in addition to a phone jack into which a phone plug (phone terminal etc.) can be inserted. There may be. In the case of the USB terminal, the user can conveniently play the musical instrument 100 while supplying power to the musical instrument 100 via the USB cable.

The input terminal 5 and the speaker 1 are installed at a plurality of locations in the acoustic space (in the room). As illustrated in FIGS. 2 and 3, the acoustic space is an acoustic space of the vehicle 50, that is, an interior of the vehicle 50. The driver and passengers other than the driver need to spend a long time in the vehicle 50 depending on the destination in driving or the like. While the driver must concentrate on driving, passengers other than the driver usually want to make effective use of the traveling time. In recent years, research and development related to automatic driving technology for automobiles has progressed, and the day when drivers are released from driving is not a distant future. Effective use of time while traveling to the destination is a concern for drivers and passengers. As an effective use of this time, and as a way of spending full time in the moving vehicle 50, it is conceivable to perform the musical instrument 100 in the vehicle 50.

As shown in FIGS. 2 and 3, the speaker 1 is desirably installed inside the doors on the driver seat 51 side and the passenger seat 52 side, for example. Further, in the second row seat 53, it is desirable to install it inside each door on the right rear seat side and the left rear seat side. Moreover, in the 3rd row | line seat 54, the example installed in right and left back is also mentioned. In addition, for example, a ceiling suspended satellite speaker may be installed on the ceiling surface near each seat, or the speaker 1 may be embedded in the ceiling surface.

The speaker 1 may be of any kind. For example, all speakers 1 may be full-range speakers for the entire band, or subwoofers for ultra-low frequencies, woofers for low-frequency ranges, each speaker 1 specializing in a specific range of frequencies, It may be a mid bass for a low frequency range, a squawker for a mid range, a tweeter for a high range, or a super tweeter for a super high range. Further, the number of speakers 1 may be one or plural. 2 and 3, the number of speakers 1 is six, but it may be more or less.

As described above, since an embodiment of the present invention assumes the interior of the vehicle 50 as an acoustic space (indoor), an in-vehicle acoustic device will be described.

In this embodiment, the head unit 10 is shown as an on-vehicle acoustic device. The head unit 10 is one type of audio equipment mounted on a vehicle such as an automobile. FIG. 7 is a block diagram showing a configuration of the head unit 10.

The head unit 10 includes a communication unit 12, a MIDI_I / F 13, a CPU 14, a ROM 115, a RAM 16, a DSP 17, an input I / F 18, a sound source 19, a bus 200, a mixer 21, and an output I / F 22.

The communication unit 12, MIDI_I / F 13, CPU 14, ROM 115, RAM 16, DSP 17, input I / F 18, sound source 19, mixer 21, and output I / F 22 are connected via a bus 200. The input terminal 5 is connected to the input I / F 18. The monitor 20 and the speaker 1 are connected to the output I / F 22.

CPU14 reads the program memorize | stored in ROM115 which is a storage medium to RAM16, and controls the head unit 10 centralizedly.

For example, the CPU 14 inputs an audio signal output from the sound source 19 to the mixer 21. Further, the CPU 14 inputs the audio signal input from the input I / F 18 to the mixer 21. The mixer 21 mixes the audio signal output from the sound source 19 and the audio signal input from the input I / F 18. The CPU 14 inputs the audio signal mixed by the mixer 21 to the DSP 17. The DSP 17 adjusts the volume or sound quality of the input audio signal. The sound quality adjustment is, for example, adjustment of frequency characteristics. The DSP 17 amplifies the audio signal after adjusting the sound quality and outputs it to the output I / F 22. The CPU 14 controls the DSP 17 and the output I / F 22 to individually control the volume and sound quality of the plurality of audio signals supplied to the plurality of speakers 1.

The sound source 19 has a plurality of audio sources. The sound source 19 includes, for example, an FM tuner, an AM tuner, a CD player, an MD player, a magnetic cassette deck, an AUX terminal, a DVD player, a hard disk drive, or a TV tuner as an audio source.

The head unit (AV amplifier) 10 is provided with a plurality of channels corresponding to a plurality of audio sources, and the plurality of channels can be mixed by the mixer 21. Therefore, for example, music can be reproduced by a CD player, and the musical instrument 100 can be played in accordance with the music. In addition, when a musical instrument 100 such as an electronic keyboard instrument is played by a plurality of people, the pitch can be enjoyed with unison. It is also possible to play music on a CD player, sing along with the music, and enjoy karaoke.

2 and 3, the monitor 20 is disposed toward the second row sheet 53 side. The monitor 20 displays information related to the volume balance or EQ adjustment of each speaker 1. The user can also perform volume balance or EQ adjustment of each speaker 1 via a touch panel (not shown) built in the monitor 20 or other user interface. In this case, the head unit 10 functions as an adjustment receiving unit that receives volume balance or EQ adjustment of each speaker 1.

As shown in FIG. 2, the input terminal 5 is preferably installed in the vicinity of the speaker 1 installed in each door on the driver's seat 51 side and the passenger seat 52 side. Further, in the second row seat 53, the input terminal 5 is desirably installed in the vicinity of the speaker 1 installed at each door on the right rear seat side and the left rear seat side. Alternatively, the input terminal 5 may be arranged on a part of the casing (not shown) of the speaker 1. In the case where the speaker 1 is arranged in the housing, the processing for arranging the input terminal 5 in the acoustic space is not necessary, so that the processing can be minimized. In other words, the user can connect and play the input terminal 5 and the musical instrument 100 simply by replacing the normal speaker 1 with the speaker 1 with the input terminal 5, so that the input terminal 5 can be easily installed in the acoustic space. Can be achieved. However, the input terminal 5 may be arranged at a location completely different from the location where the speaker 1 is installed.

The input terminal 5 performs wired communication with the output terminal provided in the musical instrument 100 by wired connection. Therefore, when the user connects the output terminal provided in the musical instrument 100 and the input terminal 5 installed in the room of the vehicle 50 with the analog audio cable, the musical instrument 100 and the head unit 10 can perform analog communication. When the user connects the output terminal provided in the musical instrument 100 and the input terminal 5 installed in the room of the vehicle 50 with a USB cable, the musical instrument 100 and the head unit 10 can perform digital communication.

Also, as shown in FIG. 6, the acoustic system may have a lid 70 with a sensor on the input terminal 5. The head unit 10 mutes the input according to the state of the lid 70. For example, the head unit 10 detects that the lid 70 has moved by a sensor and mutes the input. Further, the head unit 10 may detect that the cover 70 or the input terminal 5 is touched with a finger by using a capacitance sensor, and may mute the input. Further, the head unit 10 may not be muted or may be unmuted in a state in which a sound of a certain volume is input in order to prevent malfunction such as sound being interrupted at the start of performance. By adopting such a configuration, it is possible to eliminate the generation of unpleasant sound when a phone plug or the like is inserted or removed from the input terminal 5. The lid 70 is provided, for example, near the entrance of the input terminal 5 or in the input terminal 5.

Further, as shown in FIG. 6, the acoustic system may include a switch 80 in the vicinity of the input terminal 5. The switch 80 receives designation of the position where the performer is seated from the user. The switch 80 is installed in a console box, for example. For example, when the user plays the musical instrument 100 while sitting on the rear seat (second row seat 53), the user can specify the left, middle, right side, and the like. The head unit 10 adjusts the sound according to the designated position.

Any one or more of the musical instrument 100, the head unit 10, or the tablet terminal 15 described later includes a sound source. In addition, MIDI (Musical Instruments Digital Interface registered trademark. The following is abbreviated as MIDI registered trademark) data is generated and output, or a digital audio signal is generated and output based on MIDI data. A sound source box (not shown) provided with a sound source circuit or the like may be a sound source. The user can generate an audio signal and transmit it to the head unit 10 by connecting the sound source box to various sound devices. The sound source box may be mounted on the mixer.

The input terminal 5 and the head unit 10 (AV amplifier) are wired by various cables. Further, the speaker 1 and the head unit 10 are wired by various cables or the like.

As described above, the output terminal provided in the musical instrument 100 and the input terminal 5 installed in the room of the vehicle 50 are connected by wire, and the input terminal 5 and the head unit 10 are connected by wire. Further, the speaker 1 and the head unit 10 are connected by wire. Further, the monitor 20 and the head unit 10 are connected. However, wired communication is performed between the monitor 20 and the head unit 10.

Next, an example of the volume balance or EQ adjustment of each speaker 1 performed by the head unit 10 will be described so that the optimum sound is set in the acoustic space inside the vehicle 50.

For example, a case where a performer sits on the right rear seat and performs is described. In this case, since the speaker 1 on the right rear seat side is in the vicinity of the performer, it is desirable that the sound is low. On the other hand, since the speaker 1 on the left rear seat side on the opposite side is away from the performer, it is preferable to make it louder than the speaker 1 on the right rear seat side in order to make it easier for the performer to hear the sound. Further, the speaker 1 on the driver's seat 51 side and the passenger seat 52 side is far from where the performer is seated, so there is a case where it is not necessary to increase the size.

The head unit 10 can correct the frequency characteristics by realizing an EQ (equalizer) by a signal processing function such as a mounted DSP. That is, the head unit 10 can be adjusted and set for each speaker so as to be a sound preferred by the performer.

For example, the driver seat 51 and the passenger seat 52 are close to an automobile engine. Therefore, the head unit 10 adjusts the frequency characteristic of the performance sound so that the performance sound is not masked by the engine sound according to the frequency characteristic of the engine sound. For example, when the engine sound level is high in a high sound region (for example, 4 kHz or more), the head unit 10 increases the high sound level of the performance sound so that the high sound is not masked by the engine sound. In addition, the second row seat 53 and the third row seat 54 do not stand out the engine sound, but may cause a disturbance noise such as road noise. Therefore, the head unit 10 adjusts the frequency characteristic of the performance sound so that the performance sound is not masked by the disturbance sound according to the frequency characteristic of the disturbance noise such as road noise. For example, when the level of the disturbance sound is high in the middle sound region (for example, 500 to 4 kHz or more), the head unit 10 increases the level of the middle sound of the performance sound so that the middle sound is not masked by the disturbance sound.

The frequency characteristics such as engine noise and disturbance noise may be measured in advance in the driver's seat 51 and the passenger seat 52, or the frequency characteristics are acquired by acquiring actual sounds with microphones installed in each seat. May be. Further, the head unit 10 may estimate the frequency characteristics according to the engine speed or the vehicle speed. In this case, the head unit 10 is connected to an OBD (On-board diagnostics) connector of the vehicle and acquires information on the engine speed or the vehicle speed. The head unit 10 stores the frequency characteristics of the noise sound in advance in the storage medium such as the ROM 115 in association with the information on the engine speed or the vehicle speed. The head unit 10 reads the frequency characteristic of the noise sound and adjusts the frequency characteristic of the audio signal based on the acquired information on the current engine speed or vehicle speed.

Further, the head unit 10 further reduces the volume of the input sound automatically in response to a user opening a window or door of the vehicle 50, stopping the engine, or starting the engine. It is also possible to adopt a configuration in which muting or muting is performed with different settings for each input terminal 5.

Next, an example using the tablet terminal 15 of the second embodiment will be described. The tablet terminal 15 is a known portable information processing apparatus.

The example of the second embodiment shown in FIG. 3 is different from the example of the first embodiment in that the instrument 100 and the head unit are not configured to connect the output terminal of the instrument 100 and the indoor input terminal 5 with various cables or the like. 10 (or tablet terminal 15) is connected by wireless communication. Wireless communication or wired communication may be used between the tablet terminal 15 and the head unit 10. In the example of FIG. 3, the tablet terminal 15 and the head unit 10 are connected by a wired line with an HDMI (High-Definition Multimedia Interface: registered trademark) cable.

In the second embodiment, the input terminal 5 is not arranged in the acoustic space. Therefore, 2nd Embodiment measures a player's positional information. For example, the musical instrument 100 has a positioning function for measuring the position of the musical instrument 100 by GPS (Global Positioning System registered trademark).

The position information can also be measured by using, for example, a microphone and a speaker 1. The head unit 10 outputs measurement sound from each speaker 1. The head unit 10 records the time when the measurement sound is output. The musical instrument 100 includes a microphone. The musical instrument 100 acquires measurement sound using the microphone. The musical instrument 100 records the time when the measurement sound is acquired. The musical instrument 100 transmits time information when the measurement sound is acquired to the head unit 10. The head unit 10 measures the distance between the speaker 1 and the musical instrument 100 from the time difference from when the measurement sound is output until the measurement sound is acquired by the microphone. The head unit 10 measures the distance between the plurality of speakers 1 and the musical instrument 100 by repeating the measurement with the plurality of speakers 1. The head unit 10 can uniquely determine the position of the musical instrument 100 when measurement is performed with the three speakers 1. The head unit 10 can measure the position (coordinates) of the musical instrument 100 in the vehicle by plotting the arrangement of the speakers 1 in the vehicle in, for example, an orthogonal coordinate system with the head unit 10 as the origin. Alternatively, the head unit 10 sets an area for each seat,
Note that the head unit 10 can also measure the position information of the tablet terminal 15 by the same operation.

Upon receiving the position information, the head unit 10 performs volume balance or EQ adjustment of the speaker 1 based on the position information. For example, when the position information indicating that the musical instrument 100 is present in the driver seat 51 is received, the head unit 10 reduces the volume of the right speaker near the driver seat 51 and increases the volume of the left speaker. Adjust the sound from the left and right to reach the driver evenly. Further, since the driver's seat 51 is close to the engine of the automobile, the frequency characteristic of the performance sound is adjusted so that the performance sound is not masked by the engine sound.

Note that an audio signal may be transmitted from the musical instrument 100 to the head unit 10 or the tablet terminal 15, but in the second embodiment, the musical instrument 100 transmits, for example, MIDI format data ( (Hereinafter referred to as “MIDI data”). Since MIDI data has a smaller data amount than an audio signal, it is suitable for wireless communication. The musical instrument 100 is a MIDI device, and generates data described in the MIDI format (hereinafter referred to as “MIDI data”) according to the performance operation of the performer. The MIDI device includes a jack (not shown) of a MIDI output terminal for outputting MIDI data, and outputs the generated MIDI data to an external device connected to the jack. For example, the musical instrument 100 is connected to the MIDI_I / F 13 of the head unit 10 and transmits MIDI data to the head unit 10.

The head unit 10 drives the MIDI sound source in the sound source 19 based on the input MIDI data to generate an audio signal. When the tablet terminal 15 has MIDI_I / F, the tablet terminal 15 may drive an internal sound source to generate an audio signal. In this case, the tablet terminal 15 transmits the generated audio signal to the head unit 10.

In this example, the musical instrument 100 is a performance data transmission device. The head unit 10 or the tablet terminal 15 serves as a performance data receiving device.

For wireless communication, various standards such as wireless LAN, infrared communication, or Bluetooth (registered trademark; hereinafter, a registered trademark is omitted for Bluetooth) are used.

Next, FIG. 5 is a flowchart showing the operation of the acoustic method using a musical instrument.

In the first output step, a signal is output from an output terminal (not shown) provided in the musical instrument 100 to the input terminals 5 installed at a plurality of appropriate locations in the acoustic space. Through this step, the musical instrument 100 transmits a data signal to the input terminal 5 (S1).

In the first receiving step, the data signal from the musical instrument 100 is received at the input terminal 5 (S2).
In the second output step, a signal is output from the input terminal 5 to the head unit 10 (AV amplifier) (S3).
In the second receiving step, a signal is received by the head unit 10 (AV amplifier) (S4).
The head unit 10 (AV amplifier) adjusts the volume balance and EQ of each speaker 1 (S5). However, step S5 may be performed before step S1.
In the third output step, a signal is output from the head unit 10 (AV amplifier) to the speakers 1 installed at a plurality of appropriate locations in the acoustic space (S6).

Then, through these steps, the head unit 10 (AV amplifier) balances the volume of each speaker 1 so that the optimum sound is set at a position corresponding to the input terminal 5 according to the connected input terminal 5. Or the sound in which EQ adjustment was performed is output from the speaker 1 (S7).

The present invention is not limited to the first and second embodiments described above, and various improvements and modifications can be made without departing from the spirit of the present invention.

The electronic keyboard instrument is an example of the musical instrument 100, and other electronic musical instruments are within the scope of the present invention as long as they are suitable for performance indoors.

The interior of the vehicle 50, which is an acoustic space, is an example, and may be another interior of the vehicle 50 such as a living room, a conference room, an acoustic room, a studio, a music classroom, or a music room.

The wired communication between the output terminal of the musical instrument 100 and the input terminal 5 installed in the acoustic space is wired communication, but this is an example, and wireless communication by wireless connection such as Bluetooth is also possible.

The wired communication between the input terminal 5 and the head unit 10 (AV amplifier) is a wired connection, but this is an example, and wireless communication using a wireless connection such as Bluetooth is also possible.

The wired communication between the speaker 1 and the head unit 10 is performed by wired connection, but this is an example, and wireless communication by wireless connection such as Bluetooth is also possible.

The wired communication between the monitor 20 and the head unit 10 is wired, but this is an example, and wireless communication by wireless connection such as Bluetooth may be used.

The musical instrument 100 and the tablet terminal 15 are wirelessly connected by wireless connection, but this is an example, and wired communication by wired connection may be used.

The wired communication between the tablet terminal 15 and the head unit 10 is performed by wired connection, but this is an example, and wireless communication by wireless connection may be used.

It is an example that the user performs volume balance setting or EQ adjustment of the speaker 1 using the monitor 20 with a built-in touch panel, and the volume of the speaker 1 using the operation panel of the head unit 10 or a display unit with a built-in touch panel. Balance setting or EQ adjustment may be performed. In addition, the user may perform volume balance setting or EQ adjustment of the speaker 1 also on a display unit with a built-in operation panel or touch panel of the tablet terminal 15.

Note that the equalizer or the sound source box may be a type built in the head unit 10 or an external type.

Next, FIG. 8 is a schematic plan view of the interior of the vehicle in the acoustic system according to the third embodiment. Components that are the same as those in FIG. 2 are denoted by the same reference numerals, and descriptions of the components having the same reference numerals are omitted. FIG. 9 is a flowchart showing the operation of the sound system according to the third embodiment.

In this embodiment, the acoustic system does not include the musical instrument 100 but includes two microphones 105 instead. However, the number of microphones 105 is an example, and the acoustic system may include one or more microphones. In this example, the user enjoys karaoke in the car by playing music using a CD player or the like and singing using the microphone 105. The user is on the left rear seat side of the second row seat 53 and on the left rear seat side of the third row seat 54.

The CPU 14 of the head unit 10 detects the position of the listener in the interior space (S11). For example, in the example of FIG. 8, the microphone 105 is connected to the input terminal 5 on the left rear seat side of the second row seat 53 and the input terminal 5 on the left rear seat side of the third row seat 54. Therefore, the CPU 14 detects the position of the listener on the left rear seat side of the second row seat 53 and on the left rear seat side of the third row seat 54. Thereby, CPU14 functions as a detection part which detects a listener's position.

CPU14 implement | achieves a signal processing part with the said DSP17 by making DSP17 perform various signal processing. For example, the CPU 14 adjusts the volume of the audio signal output to the speaker 1 existing in the vehicle interior according to the detected position of the listener (S12). The CPU 14 controls the DSP 17 and the output I / F 22 and is acquired by the microphone 105 with respect to the speaker 1 on the left rear seat side of the second row seat 53 and the speaker 1 on the left rear seat side of the third row seat 54. An audio signal related to the singing sound is output. The head unit 10 adjusts the sound of a uniform volume from the left and right to reach the user by decreasing the volume of the left speaker and increasing the volume of the right speaker. The head unit 10 lowers the level of the audio signal related to the singing sound for the speakers installed in the vicinity of the driver seat 51 and the passenger seat 52. However, the head unit 10 outputs audio signals output from a sound source such as a CD player to all the speakers 1, and allows the driver to listen only to music. As described above, the CPU 14 adjusts the volume balance of the audio signals of the plurality of channels in the mixer 21.

Further, the CPU 14 adjusts the sound quality of the audio signal output to the speaker 1 existing in the vehicle interior according to the detected position of the listener (S13). For example, since the user of the seat 54 in the third row is close to the rear door of the automobile and there is a possibility that disturbance noise such as road noise is noticeable, the head unit 10 performs music and singing based on the frequency characteristics of the noise sound. Adjust the frequency characteristics of the sound. For example, the head unit 10 increases the level of the middle sound region (for example, 500 to 4 kHz or more). The frequency characteristics such as disturbance sound may be measured in advance, or may be acquired by acquiring an actual sound when no singing sound is input by the microphone 105. Thus, the CPU 14 of the head unit 10 functions as an acoustic environment acquisition unit that acquires the acoustic environment at the listener's position using a microphone or the like. In this case, the CPU 14 processes an audio signal to be output to a speaker existing in the vehicle interior according to the acoustic environment acquired by the acoustic environment acquisition unit.

The head unit 10 outputs the audio signal after the volume adjustment and the sound quality adjustment to the plurality of speakers 1 (S14).

This allows a user in the car to listen to music and singing sound with an optimal volume or sound quality according to the seating position.

In the example of FIG. 8, the input unit 5 includes a plurality of input terminals 5 installed at predetermined locations in the vehicle interior space, and the detection unit (CPU 14) is an input terminal to which a device such as a microphone is connected. In this configuration, a listener is detected at a position corresponding to 5. However, it is also possible to detect the position of the listener by detecting the position of the microphone 105 from the time difference from when the head unit 10 outputs the measurement sound from each speaker 1 until the microphone 105 acquires the measurement sound. It is. In this case, the input terminal 5 is not essential.

8 is an example of enjoying karaoke using the microphone 105, the acoustic system of the present embodiment can be applied to other in-car entertainment.

For example, instead of the microphone 105, the acoustic system includes the above-described tablet terminal 15, an information processing device such as a smartphone, a portable game machine, or an educational toy (tablet toy) having an audio signal output terminal. It may be. Also in this case, the head unit 10 detects a listener at a position corresponding to the input terminal 5 to which a device such as a microphone is connected among the plurality of input terminals 5. Alternatively, the head unit 10 outputs the measurement sound from each speaker 1 and detects the position of each device from the time difference until the measurement sound is acquired by the microphone (not shown) of each device, and the position of the listener Can be detected. In this case, the plurality of input terminals 5 are not essential. An audio device such as a tablet terminal 15, an information processing apparatus such as a smartphone, a portable game machine, or an educational toy (tablet toy) equipped with an audio signal output terminal may be wirelessly connected to the head unit 10.

Next, FIG. 10 is a schematic plan view of the interior of the vehicle in the acoustic system according to the first modification. FIG. 11 is a block diagram illustrating a functional configuration of the DSP 17 in the acoustic system according to the first modification. FIG. 12 is a flowchart showing the operation of the acoustic system according to the first modification.

The acoustic system according to Modification 1 forms directivity as another example of audio signal processing (S131). As shown in FIG. 11, the DSP 17 functionally includes a directivity forming unit 171. The directivity forming unit 171 distributes the input audio signal of each channel to the plurality of speakers 1. The directivity forming unit 171 controls the delay amount of the audio signal supplied to the plurality of speakers 1 to form a predetermined directivity in the sound output from the speakers 1. For example, as shown in FIG. 10, the directivity forming unit 171 sends audio signals supplied to the plurality of speakers 1 to the position of the listener (for example, the left rear seat side of the second row seat 53) and each speaker 1. Delay according to the distance. As a result, the directivity forming unit 171 virtually changes the distance from the listener's position to the speaker 1. Since the sound output from each speaker 1 arrives at the same timing at the listener's position, it is heard as a high-level sound. Even when the volume of the audio signal of each speaker 1 is low, the listener at the listener's position can listen to a certain volume, and the listener at other positions can hear (or hardly hear) the volume at a low level. ).

Therefore, in the acoustic system according to the first modification, each user in the vehicle can listen to only his / her desired sound at a high level without letting other users listen to the sound. Thereby, for example, a user who performs karaoke can listen only to himself / herself without letting others hear his / her singing sound. In addition, for example, when a call is made to the outside (for example, a home) using a voice call device such as a smartphone, only the content of the message from the outside can be heard.

Next, FIG. 13 is a block diagram showing a functional configuration of the DSP 17 in the acoustic system according to the second modification. FIG. 14 is a flowchart showing the operation of the acoustic system according to the second modification.

The acoustic system according to Modification 2 performs echo cancellation processing as another example of audio signal processing (S150). As shown in FIG. 13, the DSP 17 functionally includes an echo removal unit 172.

The echo removal unit 172 inputs an audio signal to be output to the speaker 1. The echo removal unit 172 performs echo removal processing using an adaptive filter, for example. The echo removing unit 172 estimates a feedback component in which the sound output from the speaker 1 reaches the microphone 105 through the acoustic space in the vehicle. The echo removing unit 172 estimates the feedback component by processing the audio signal output to the speaker 1 with an FIR filter that simulates the impulse response in the acoustic space in the vehicle. The echo removing unit 172 removes the estimated feedback component from the signal acquired by the microphone 105. The echo removal unit 172 updates the filter coefficient of the FIR filter using an adaptive algorithm such as LMS or RLS.

The echo cancellation process may be performed before the directivity forming process, but the echo cancellation process may be performed individually using, for example, an audio signal output to each speaker 1.

In this case, the head unit 10 can cancel not only the voice of the call destination received from the outside but also the sound from the sound source such as the playback sound of the CD player. Therefore, even if the listener makes a call with the outside while listening to the reproduction sound of the CD player, the reproduction sound of the CD player or the like is not transmitted to the outside. Therefore, the outside caller can clearly hear only the voice uttered by the listener.

In addition, although the aspect which installed the speaker 1 which emits a sound in the space in a vehicle was shown in this embodiment, the listener may use a headphone as an example of another speaker. In this case, the listener can selectively listen only to the sound he / she wants to listen to. For example, in the example of FIG. 8, the head unit 10 gives the speaker 1 the reproduction sound of the CD player and the singing sound acquired by the microphone 105 to the listener on the left rear seat side of the second row seat 53. Output from. On the other hand, the head unit 10 outputs an audio signal related to the voice from the call party to a headphone (not shown) used on the left rear seat side of the third row seat 54. Thus, the listener on the left rear seat side of the second row seat 53 can talk while the listener on the left rear seat side of the third row seat 54 enjoys karaoke. Whether or not headphones are used is determined by manual input from the user.

Also, when using headphones, noise cancellation processing is suitable. For example, when the listener on the left rear seat side of the third row seat 54 uses headphones, the head unit 10 uses the noise sound acquired by the microphone 105 on the left rear seat side of the third row seat 54. Noise cancellation processing.

Modification 3
The acoustic system according to Modification 3 relates to sound masking. The head unit 10 outputs a masker sound to a specific user (for example, a driver) in the vehicle. For example, when the user is in the second row seat 53 or the third row seat 54, a masker sound is output from the speaker 1 on the driver's seat 51 side so that the content cannot be understood. The masker sound is preferably composed of a disturbing sound that disturbs the sound to be masked, a background sound that is continuously generated, and an effect sound that is generated intermittently. For example, the disturbing sound is obtained by modifying a human voice on the time axis or the frequency axis so as to make no meaning in terms of vocabulary (the contents cannot be understood). The background sound is a sound that is difficult for the listener to pay attention and has no unpleasant feeling, such as a stream of a stream or a buzz of trees. The production sound is a high performance sound such as a musical sound generated intermittently. The production sound draws the attention of the listener and makes the unpleasantness of the disturbing sound inconspicuous. By making the driver listen to a masker sound that combines these disturbing sounds, background sounds, and production sounds, it is possible to reduce driver discomfort while masking the conversation contents of the user in the rear seat. .

FIG. 15 is a schematic plan view of the interior of the vehicle in the acoustic system according to the fourth modification. As another example of the audio signal processing, the acoustic system according to the modification 4 virtually localizes a sound image at a predetermined position around the listener. Virtual localization is performed by a head-related transfer function (HRTF). The head-related transfer function indicates a transfer function between the sound source position and the listener's ear. The head-related transfer function is an impulse response that represents the volume, arrival time, frequency characteristics, and the like of the sound from the virtual speaker installed at a certain position to the left and right ears. The head unit 10 gives a head-related transfer function from the position of the monitor 20 to the left and right ears to the center channel audio signal when the user is viewing the movie content. Virtual localization based on the head-related transfer function is suitable when the user uses headphones. Alternatively, the virtual localization based on the head-related transfer function is also suitable when the speaker 1 is installed in the immediate vicinity of the user such as a headrest.

As illustrated in FIG. 15, the sound image of the center channel is virtually localized at the position on the monitor 20, so that the user can perform a plan view of the interior of the vehicle in the acoustic system according to the fifth modification. The acoustic system according to the modified example 5 reproduces a pseudo reflected sound 501 that simulates a reflected sound generated in an acoustic space such as a concert hall, so that it can be present in another space such as an actual concert hall while in the vehicle. This is what makes the listener feel the feeling.

The head unit 10 convolves an audio signal with an impulse response corresponding to an acoustic space (for example, a concert hall) selected by the user. The head unit 10 generates the pseudo reflected sound 501 at a plurality of positions as shown in FIG. 16 by changing the gain ratio and the delay amount of the signal supplied to each speaker 1. Thereby, the user is also suitable for the process according to the modified example 5 when the user uses headphones or when the speaker 1 is installed in the immediate vicinity of the user such as a headrest.

DESCRIPTION OF SYMBOLS 1 ... Speaker 5 ... Input terminal 10 ... Head unit 12 ... Communication part 13 ... MIDI_I / F
14 ... CPU
15 ... Tablet terminal 16 ... RAM
17 ... DSP
18 ... Input I / F
19 ... Sound source 20 ... Monitor 21 ... Mixer 22 ... Output I / F
50 ... Vehicle 51 ... Driver's seat 52 ... Passenger seat 53 ... Second row seat 54 ... Third row seat 70 ... Lid 80 ... Switch 100 ... Musical instrument 101 ... Housing 102 ... Back 105 ... Microphone 115 ... ROM
171 ... Directivity forming part 172 ... Echo removing part 200 ... Bus 501 ... Pseudo reflection sound

Claims

An instrument with an output terminal,
Multiple input terminals installed in multiple locations in the acoustic space;
A plurality of speakers installed in a plurality of appropriate locations in an acoustic space;
The plurality of speakers connected to the plurality of input terminals and the plurality of speakers and capable of mixing a plurality of channels, and the plurality of speakers according to positions of the input terminals to which the output terminals are connected among the plurality of input terminals. An amplifier for performing each volume balance or EQ adjustment,
A sound system using a musical instrument.
The acoustic system using a musical instrument according to claim 1, wherein at least one of the plurality of input terminals is a USB terminal.
A lid with a sensor is provided on at least one of the plurality of input terminals,
The sound system using the musical instrument according to claim 1 or 2, wherein the amplifier mutes an input from the input terminal according to a state of the lid.
The sound system using the musical instrument according to any one of claims 1 to 3, wherein a sound source is provided in at least one of the musical instrument and the amplifier.
The sound system using the musical instrument according to any one of claims 1 to 4, further comprising an adjustment receiving unit that receives a volume balance setting or EQ adjustment of the speaker from a user.
The acoustic system using the musical instrument according to any one of claims 1 to 5, wherein at least one of the plurality of input terminals includes a switch that receives the designation of the position.
Signals are output from the output terminals provided on the instrument to multiple input terminals installed at multiple locations in the acoustic space.
Receiving signals at the plurality of input terminals;
Output signals to the amplifier from the plurality of input terminals,
Receive the signal with the amplifier,
In the amplifier, according to the position of the input terminal connected to the output terminal among the plurality of input terminals, volume adjustment or EQ adjustment of each of the plurality of speakers is performed,
Output signals from the amplifier to a plurality of speakers installed at a plurality of appropriate locations in the acoustic space.
An acoustic method using a musical instrument.
A detection unit for detecting the position of the listener in the interior space of the vehicle;
A signal processing unit that performs processing of an audio signal output to a speaker that is present in the vehicle interior according to the position of the listener detected by the detection unit;
Audio equipment equipped with.
A plurality of input terminals installed at predetermined locations in the interior space of the vehicle,
The detection unit detects the listener at a position corresponding to the input terminal to which a device is connected among the plurality of input terminals.
The acoustic device according to claim 8.
A mixer that is connected to the plurality of input terminals and the speaker, mixes audio signals of a plurality of channels, and outputs the mixed signal to the speaker;
The signal processing unit adjusts a volume balance of the audio signals of the plurality of channels in the mixer;
The acoustic device according to claim 9.
The acoustic device according to any one of claims 8 to 10, wherein the signal processing unit adjusts a volume or a frequency characteristic of an audio signal output to the speaker.
The acoustic device according to any one of claims 8 to 11, wherein the signal processing unit controls directivity so that sound output from the speaker reaches a position of the listener.
An acoustic environment acquisition unit for acquiring an acoustic environment at the position of the listener;
The said signal processing part performs the process of the audio signal output to the speaker which exists in the said vehicle interior according to the said acoustic environment acquired by the said acoustic environment acquisition part, It is any one of Claims 8 thru | or 12. The audio equipment described in 1.
The acoustic device according to any one of claims 8 to 13,
A speaker connected to the head unit;
Sound system with
The acoustic system according to claim 14, wherein the speaker includes a headphone.