JP2021010135A - Acoustic device and vehicle - Google Patents

Abstract

To reflect a travel feeling of a vehicle on sound to be output from a speaker arranged inside a cabin.SOLUTION: An acoustic device 10A includes: an effect giving section 120 for outputting a sound signal SC as a sound signal S1 and performing signal processing to give an acoustic effect to the sound signal S1 so as to generate a sound signal S2; a mixer 130A for generating a sound signal S3 to be given to a speaker 50-1 arranged in a cabin by mixing the sound signal S1 with the sound signal S2 at a first ratio, and also generating a sound signal S4 to be given to a speaker 50-2 arranged in a cabin by mixing the sound signal S1 with the sound signal S2 at a second ratio; and an adjustment section 140A for adjusting the first ratio and the second ratio in accordance with a speed to be expressed by speed data CV to be given from a travel state detector 60A.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to audio equipment and vehicles.

Various techniques related to in-vehicle karaoke have been proposed in which a microphone unit and a speaker are installed in the vehicle interior so that karaoke can be enjoyed in the vehicle interior (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2008-216399

However, in the conventional in-vehicle karaoke, there is a problem that the running feeling of the vehicle is not reflected in the sound output from the speaker, which is not interesting.

The present disclosure has been made in view of such circumstances, and one of the problems to be solved is to provide a technique for reflecting the running feeling of the vehicle in the sound output from the speaker installed in the vehicle interior.

One aspect of the acoustic device according to the present disclosure is an effect imparting unit that generates a second sound signal by performing signal processing for imparting an acoustic effect to the first sound signal, and a first speaker provided in the vehicle interior. The third sound signal to be given to the vehicle interior is generated by mixing the first sound signal and the second sound signal at the first ratio, and the third sound signal is given to the second speaker provided in the passenger compartment. A mixer generated by mixing the first sound signal and the second sound signal at a second ratio, and the first ratio and the second ratio according to the traveling state of the vehicle. It has an adjusting unit for adjusting.

One aspect of the vehicle according to the present disclosure includes the sound device, the first speaker, and the second speaker.

It is a figure which shows the configuration example of the in-vehicle karaoke system 1A including the sound apparatus 10A which concerns on 1st Embodiment. It is a top view of the vehicle C1 equipped with the sound device 10A. It is a figure which shows an example of the storage contents of the characteristic management table in the sound apparatus 10A. It is a figure which shows the configuration example of the in-vehicle karaoke system 1B including the sound apparatus 10B which concerns on 2nd Embodiment. It is a top view of the vehicle C2 equipped with the sound device 10B. It is a figure which shows an example of the storage contents of the characteristic management table in the sound apparatus 10B. It is a figure which shows the configuration example of the in-vehicle karaoke system 1C including the sound apparatus 10C which concerns on 3rd Embodiment. It is a top view of the vehicle C3 equipped with the sound device 10C.

Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings. In the drawings, the dimensions and scale of each part are appropriately different from the actual ones. In addition, the embodiments described below are preferred specific examples of the present disclosure. For this reason, the present embodiment is provided with various technically preferable limitations. However, the scope of the present disclosure is not limited to these forms unless otherwise stated in the following description to limit the present disclosure.

<1. First Embodiment>
FIG. 1 is a diagram showing a configuration example of an in-vehicle karaoke system 1A including an audio device 10A according to the first embodiment of the present disclosure. As shown in FIG. 1, in addition to the sound device 10A, the in-vehicle karaoke system 1A includes a microphone 20, an A / D converter 30, an amplifier 40-1, an amplifier 40-2, a speaker 50-1, and a speaker. 50-2 and a traveling state detector 60A are included. The microphone 20 is connected to the A / D converter 30 via a signal line. The A / D converter 30 is connected to the sound device 10A via a signal line. The speaker 50-1 is connected to the amplifier 40-1. The speaker 50-2 is connected to the amplifier 40-2. The amplifier 40-1 and the amplifier 40-2 are each connected to the sound device 10A via a signal line. The traveling state detector 60A is connected to the sound device 10A via a signal line.

The microphone 20 is, for example, an omnidirectional microphone unit. When the passenger of the vehicle C1 sings a karaoke song, the singing sound is picked up by the microphone 20, and a sound signal representing the sound wave shape of the singing sound is output from the microphone 20 to the A / D converter 30. The A / D converter 30 performs A / D conversion on the output signal of the microphone 20, and outputs the sound signal SA, which is the conversion result, to the sound device 10A.

An accompaniment sound signal S5 representing a waveform of a karaoke accompaniment sound is given to the sound device 10A from a sound source (not shown). The sound device 10A adds the signal obtained by performing signal processing on the sound signal SA and the accompaniment sound signal S5, and gives the sound signal S3 and the speaker 50-2 to the speaker 50-1 based on the added signal. The sound signal S4 to be given is generated. The amplifier 40-1 amplifies the signal level of the sound signal S3 output from the sound device 10A to a signal level suitable for driving the speaker, and outputs the amplified signal to the speaker 50-1. The amplifier 40-2 amplifies the signal level of the sound signal S4 output from the sound device 10A to a signal level suitable for driving the speaker, and outputs the amplified signal to the speaker 50-2. As a result, in-vehicle karaoke is realized.

The signal processing executed by the sound device 10A includes a process of adding a sound effect to the singing voice. The process of giving a sound effect to the singing voice includes at least a process of adjusting the reverberation of the singing voice, that is, a process of giving a delay. Preferably, the process of imparting a sound effect includes both a process of imparting a delay and a process of adjusting the frequency characteristics. In the following, the sound signal of the singing voice to which the sound effect is not applied is referred to as a “pre-added signal”, and the sound signal to which the sound effect is applied is referred to as a “added signal”.

The traveling state detector 60A is a sensor that detects the traveling state of the vehicle C1. Examples of the index indicating the traveling state of the vehicle C1 include the traveling speed of the vehicle C1 or the traveling direction of the vehicle C1, but in the present embodiment, the traveling speed of the vehicle C1 is adopted as an index indicating the traveling state. The traveling state detector 60A in the present embodiment is, for example, a speed sensor or an acceleration sensor. The traveling state detector 60A detects the traveling speed of the vehicle C1 and outputs speed data CV representing the detected traveling speed to the sound device 10A. When an acceleration sensor is used as the traveling state detector 60A, the traveling speed of the vehicle C1 may be calculated by integrating the detected accelerations every moment.

FIG. 2 is a plan view of the vehicle C1 equipped with the in-vehicle karaoke system 1A. The sound device 10A is arranged on the console on the driver's side of the vehicle C1. In FIG. 2, the A / D converter 30, the amplifier 40-1, the amplifier 40-2, and the traveling state detector 60A are not shown, and the signal lines are not shown. Although detailed illustration is omitted in FIG. 2, the A / D converter 30, the amplifier 40-1, the amplifier 40-2, and the driving state detector 60A are also arranged on the console on the driver's side of the vehicle C1.

In the passenger compartment CR of the vehicle C1, four seats 51 to 54 arranged in a rectangular shape, a ceiling 6, a front right door 71, a front left door 72, a rear right door 73, and a rear left door 74 are arranged. Will be done. The seat 51 of the vehicle C1 is the driver's seat, and the seat 52 is the passenger seat. Either the seat 51 or the seat 52 may be the driver's seat, but in the following description, the seat 51 will be described as the driver's seat and the seat 52 as the passenger seat. Seat 53 is the rear right seat and seat 54 is the rear left seat. Each of the seats 51 to 54 is made of cloth or leather and has sound absorption. Seats 51-54 face in a common direction.

The microphone 20 is installed near the center of the ceiling 6, specifically, near a room light (not shown in FIG. 2). The speaker 50-1 is an example of the first speaker arranged in the passenger compartment CR, and the speaker 50-2 is an example of the second speaker arranged in the passenger compartment CR. The speaker 50-1 and the speaker 50-2 are arranged on the XX'line, which is the center line of the vehicle C1, so that the sound emitting surfaces face each other. For example, the speaker 50-1 is arranged on the console of the vehicle C1, and the speaker 50-2 is arranged between the seats 53 and 54. In the present embodiment, the speaker 50-2 is arranged between the seat 53 and the seat 54, but the speaker 50-2 may be arranged between the seat 51 and the seat 52. Further, the speaker 50-1 may be arranged between the seat 51 and the seat 52, and the speaker 50-2 may be arranged between the seat 53 and the seat 54. In short, the speaker 50-1 may be arranged in front of the passenger compartment CR with respect to the speaker 50-2.

Although the details will be described later, the sound device 10A generates a pre-grant signal from the sound signal SA, and generates a pre-grant signal from the pre-grant signal. The pre-assigned signal is an example of the first sound signal in the present disclosure, and the imparted signal is an example of the second sound signal in the present disclosure. Then, the sound device 10A mixes the pre-assigned signal, the imparted signal, and the accompaniment sound signal S5 to generate a sound signal S3, and mixes the pre-assigned signal, the imparted signal, and the accompaniment sound signal S5 to generate a sound signal. Generate S4. The sound signal S3 is an example of the third sound signal in the present disclosure, and the sound signal S4 is an example of the fourth sound signal in the present disclosure. The accompaniment sound signal S5 is an example of the fifth sound signal in the present disclosure. In the present embodiment, the sound device 10A adjusts the ratio of the pre-assigned signal to the imparted signal in the sound signal S3 and the ratio of the pre-assigned signal to the imparted signal in the sound signal S4 according to the speed represented by the speed data CV. To do. As a result, the characteristics of the sounds output from each of the speaker 50-1 and the speaker 50-2 change according to the change in the traveling speed of the vehicle C1, and a traveling feeling is produced. Hereinafter, the audio device 10A, which remarkably exhibits the features of the present embodiment, will be mainly described.

The sound device 10A is, for example, a DSP (Digital Signal Processor). As shown in FIG. 1, the sound device 10A includes a noise removing unit 100, a howling suppressing unit 110, an effect applying unit 120, a mixer 130A, and an adjusting unit 140A. Each of the noise removing unit 100, the howling suppressing unit 110, the effect applying unit 120, the mixer 130A, and the adjusting unit 140A shown in FIG. 1 is a software module realized by operating the DSP according to the software.

A sound signal SA and an accompaniment sound signal S5 are given to the noise removing unit 100. The noise removing unit 100 removes low-frequency noise components such as road noise from the sound signal SA, further refers to the input accompaniment sound signal S5, and removes the signal component of the accompaniment sound signal S5 included in the sound signal SA. To generate the output signal SB. The accompaniment sound signal S5 and the noise component are removed from the sound signal SA in order to extract the signal component corresponding to the singing voice of the passenger of the vehicle C1. Further, by removing the accompaniment sound signal S5 from the sound signal SA, an effect of suppressing howling is also expected.

The howling suppression unit 110 performs a howling suppression process on the output signal SB of the noise removal unit 100 to generate an output signal SC. More specifically, the howling suppression unit 110 divides the output signal SB of the noise removal unit 100 into frames having a certain time length, performs inverse Fourier transform for each frame, and performs signal strength of each of the plurality of frequency bands in the frame. Is calculated. Then, the howling suppression unit 110 tracks the time change of the signal strength for each frequency band, and monitors the presence or absence of the frequency band in which the state in which the signal strength exceeds the predetermined threshold value continues for a predetermined time or longer. When there is no frequency band in which the signal strength exceeds a predetermined threshold value for a predetermined time or longer, the howling suppression unit 110 outputs the output signal SB of the noise removal unit 100 as it is as an output signal SC. On the other hand, when there is a frequency band in which the signal strength exceeds a predetermined threshold value for a predetermined time or longer, the howling suppression unit 110 lowers the signal strength of the frequency band with respect to the output signal SB. Signal processing is performed to generate an output signal SC.

The effect imparting unit 120 outputs the output signal SC of the howling suppressing unit 110 as it is as the pre-applying signal S1. Further, the effect imparting unit 120 performs signal processing for imparting an acoustic effect to the pre-applied signal S1 to generate and output the imparted signal S2.

The pre-applied signal S1 and the applied signal S2 output from the effect imparting unit 120 are given to the mixer 130A after being multiplied by the coefficients by the adjusting unit 140A. The adjusting unit 140A will be described in detail later, but the adjusting unit 140A includes a multiplication unit 146-1, a multiplication unit 146-2, a multiplication unit 146-3, and a multiplication unit 146-4. The multiplication unit 146-1 multiplies the pre-assignment signal S1 by a coefficient a (0.5 ≦ a ≦ 1) and outputs the signal to the mixer 130A. The multiplication unit 146-2 multiplies the pre-assignment signal S1 by a coefficient (1-a) and outputs the signal to the mixer 130A. The multiplication unit 146-3 multiplies the applied signal S2 by the coefficient a and outputs the signal to the mixer 130A. The multiplication unit 146-4 multiplies the applied signal S2 by a coefficient (1-a) and outputs the signal to the mixer 130A.

As shown in FIG. 1, the mixer 130A is given an output signal of each of the multiplication units 146-1 to 146-4 and an accompaniment sound signal S5. As shown in FIG. 1, the mixer 130A mixes the output signal of the multiplication unit 146-1 and the output signal of the multiplication unit 146-4, and further mixes the accompaniment sound signal S5 to generate the sound signal S3. As described above, the output signal of the multiplication unit 146-1 is a signal obtained by multiplying the pre-grant signal S1 by the coefficient a, and the output signal of the multiplication unit 146-2 is the applied signal S2 multiplied by the coefficient (1-a). It is a signal. Therefore, the ratio of the pre-assigned signal S1 and the imparted signal S2 in the sound signal S3 is a: 1-a. In other words, the mixer 130A mixes the pre-assigned signal S1 and the imparted signal S2 at a ratio of a: 1-a, and further mixes the accompaniment sound signal S5 to generate the sound signal S3. When a = 1, the mixer 130A mixes the pre-applied signal S1 and the accompaniment sound signal S5 to generate the sound signal S3. Further, in the range of 0.5 ≦ a <1, the ratio R1 of the pre-grant signal S1 to the given signal S2 in the sound signal S3 is expressed as a / (1-a). The ratio R1 is an example of the first ratio in the present disclosure.

Further, the mixer 130A mixes the output signal of the multiplication unit 146-2 and the output signal of the multiplication unit 146-3, and further mixes the accompaniment sound signal S5 to generate the sound signal S4. As described above, the output signal of the multiplication unit 146-2 is a signal obtained by multiplying the pre-grant signal S1 by a coefficient (1-a), and the output signal of the multiplication unit 146-3 is the applied signal S2 multiplied by a coefficient a. It is a signal. Therefore, the ratio of the pre-assigned signal S1 and the imparted signal S2 in the sound signal S4 is 1-a: a. In other words, the mixer 130A mixes the pre-assigned signal S1 and the imparted signal S2 at a ratio of 1-a: a, and further mixes the accompaniment sound signal S5 to generate the sound signal S4. When a = 1, the mixer 130A mixes the added signal S2 and the accompaniment sound signal S5 to generate the sound signal S4. Further, in the range of 0.5 ≦ a <1, the ratio R2 of the pre-grant signal S1 to the given signal S2 in the sound signal S4 is expressed as (1-a) / a. The ratio R1 and the ratio R2 have a reciprocal relationship. The ratio R2 is an example of the second ratio in the present disclosure. The ratio R1 and the ratio R2 do not necessarily have to be in the reciprocal relationship.

Velocity data CV is given to the adjusting unit 140A. The adjusting unit 140A adjusts the coefficient a that defines the ratio R1 and the ratio R2 according to the traveling speed represented by the speed data CV. As shown in FIG. 1, the adjusting unit 140A has a smoothing unit 142A and a standardized unit 144A in addition to the multiplication unit 146-1 to 146-4. The smoothing unit 142A removes the high frequency component from the speed data CV by calculating the moving average of the speed data CV given from the traveling state detector 60A and gives it to the normalization unit 144.

The normalization unit 144A has a characteristic table shown in FIG. The normalization unit 144A determines the coefficient a according to the stored contents of the characteristic table shown in FIG. 3 and the speed represented by the speed data CV smoothed by the smoothing unit 142A. As shown in FIG. 3, the stored contents of the characteristic table are such that the coefficient a is set to 0.5 when the traveling speed is 50 km / h or less, and when the traveling speed is faster than 50 km / h and less than 100 km / h. It means that the coefficient a is increased to 1 according to the increase in the traveling speed, and that the coefficient a is set to 1 when the traveling speed is 100 km / h or more.

Since the relationship between the coefficient a and the traveling speed is defined as shown in FIG. 3, in the present embodiment, the ratio R1 when the traveling speed of the vehicle C1 is high is set in the range of 50 km / h to 100 km / h. , It becomes larger than the ratio R1 in the case of low speed. Further, the ratio R2 when the traveling speed of the vehicle C1 is high is smaller than the ratio R2 when the traveling speed is low. In other words, the adjusting unit 140A increases the ratio R1 and decreases the ratio R2 as the traveling speed of the vehicle C1 increases.

Due to the configuration described above, in the in-vehicle karaoke system 1A, when the vehicle C1 is traveling at a speed of 50 km / h or less, the coefficient a is set to 0.5, and the speaker 50-1 and the speaker 50- The pre-assigned signal S1 and the imparted signal S2 are evenly distributed with respect to 2. In the process of accelerating the speed of the vehicle C1 from 50 km / h to 100 km / h, the coefficient a increases from 0.5 to 1.0, and for the speaker 50-1, the distribution amount of the pre-assignment signal S1 increases and is already assigned. While the distribution amount of the signal S2 decreases, the distribution amount of the applied signal S2 increases and the distribution amount of the pre-applied signal S1 decreases for the speaker 50-2. Therefore, in the speed range of 50 km / h to 100 km / h, the faster the speed of the vehicle C1, the less reverberation of the sound output from the speaker arranged in front of the passenger compartment CR, while the reverberation of the sound of the passenger compartment CR decreases. The reverberation of the sound output from the speaker arranged at the rear is increased, and a audible feeling that the sound flows from the front to the rear can be obtained.

As described above, according to the acoustic device 10A of the present embodiment, the characteristics of the singing voice output from the speakers 50-1 and the speakers 50-2 installed in the vehicle interior CR change according to the speed of the vehicle C1. As a result, the running feeling of the vehicle C1 is produced, and it becomes possible to improve the fun. In addition, according to the sound device 10A of the present embodiment, the characteristics of the sound radiated from each of the speakers 50-1 and the speakers 50-2 to the passenger compartment CR are changed from moment to moment according to the change in the traveling speed of the vehicle C1. It changes with. Therefore, even if a loop such as speaker 50-1 (or speaker 50-2) → microphone 20 → sound device 10A → speaker 50-1 (or speaker 50-2) ... occurs, the characteristics are as described above. There is also an effect that howling is less likely to occur compared to when it does not change.

<2. Second Embodiment>
FIG. 4 is a diagram showing a configuration example of an in-vehicle karaoke system 1B including the sound device 10B according to the second embodiment of the present disclosure. In FIG. 4, the same components as those in FIG. 1 are designated by the same reference numerals. As is clear from comparing FIG. 4 and FIG. 1, the in-vehicle karaoke system 1B is different from the in-vehicle karaoke system 1A in the following two points. First, the sound device 10B is provided instead of the sound device 10A. Secondly, the traveling state detector 60B is provided instead of the traveling state detector 60A.

FIG. 5 is a plan view of the vehicle C2 equipped with the in-vehicle karaoke system 1B. Also in FIG. 5, the same components as those in FIG. 2 are designated by the same reference numerals. In FIG. 5, the A / D converter 30, the amplifier 40-1, the amplifier 40-2, and the traveling state detector 60B are not shown.

The traveling state detector 60B detects the traveling direction of the vehicle C2 and outputs the traveling direction data CA indicating the detected traveling direction to the sound device 10B. In the traveling direction data CA, the traveling direction when the vehicle C2 is traveling straight in the direction of the XX'line in FIG. 5 is set to 0 °, and the change in the clockwise traveling direction is represented by a positive angle, and is counterclockwise. This is data that represents a change in the traveling direction with a negative angle. Specific examples of the traveling state detector 60B include a biaxial acceleration sensor that detects each acceleration in the x-axis direction and the y-axis direction in FIG. 5, and each of the left and right rear wheels (not shown in FIG. 5) of the vehicle C2. An example is a rotation speed sensor that detects the rotation speed. When a rotation speed sensor is used as the traveling state detector 60B, the difference between the rotation speeds of the left and right rear wheels of the vehicle C2 may be converted into the above angle.

As shown in FIG. 5, the speaker 50-1 and the speaker 50-2 included in the in-vehicle karaoke system 1B are so-called door speakers, and are arranged so as to face each other in the vehicle interior CR. More specifically, the speaker 50-1 is arranged on the front light door 71 with its sound emitting surface facing the seat 51. The speaker 50-2 is arranged on the front left door 72 with its sound emitting surface facing the seat 52. That is, in the present embodiment, the speaker 50-1 is arranged on the right side of the passenger compartment CR of the vehicle C2, and the speaker 50-2 is arranged on the left side of the passenger compartment CR.

As is clear from a comparison between FIGS. 4 and 1, the difference between the sound device 10B and the sound device 10A is that the adjustment unit 140B is provided instead of the adjustment unit 140A. The difference between the adjusting unit 140B and the adjusting unit 140A is that the smoothing unit 142B is provided instead of the smoothing unit 142A and the standardized unit 144B is provided instead of the standardized unit 144A. The smoothing unit 142B removes the high frequency component from the traveling direction data CA by calculating the moving average of the traveling direction data CA given from the traveling direction detector 60B, and gives the smoothing unit 142B to the normalizing unit 144B. The normalization unit 144B has a characteristic table shown in FIG. The normalization unit 144B is multiplied by the multiplication units 146-1 to 146-4 according to the stored contents of the characteristic table shown in FIG. 6 and the travel direction indicated by the travel direction data CA smoothed by the smoothing unit 142B. The coefficient b to be used is determined. The coefficient b in the present embodiment corresponds to the coefficient a in the first embodiment. The coefficient b in the present embodiment changes from 0 to 1 according to the traveling direction of the vehicle C2, and in the range of 0 <b <1, the ratio R1 in the present embodiment is expressed as b / (1-b), and the ratio is expressed as b / (1-b). R2 is represented as (1-b) / b. Also in this embodiment, the ratio R1 and the ratio R2 have a reciprocal relationship. The ratio R1 and the ratio R2 do not necessarily have to be in the reciprocal relationship.

FIG. 6 is a diagram showing an example of the stored contents of the characteristic table. As shown in FIG. 6, the stored contents of the characteristic table of the present embodiment are that the coefficient b is 0.5 when the traveling direction is 0 °, and the traveling direction is in the range of 0 ° to 35 ° clockwise. When the degree of change is greater, the coefficient b is closer to 1, and when the traveling direction is in the range of 0 ° to 35 ° counterclockwise, the greater the degree of change is, the closer the coefficient b is to 0. Represents.

Since the relationship between the coefficient b and the traveling direction is defined as shown in FIG. 6, in the present embodiment, when the vehicle C2 is traveling straight, that is, when the traveling direction of the vehicle C2 is 0 °. The coefficient b is set to 0.5. When the coefficient b is 0.5, both the ratio R1 and the ratio R2 become 1, and the pre-assigned signal S1 and the imparted signal S2 are evenly distributed to each of the speaker 50-1 and the speaker 50-2. Be done.

When the traveling direction of the vehicle C2 changes clockwise, the coefficient b increases from 0.5 to 1 according to the degree of the change. As a result, the ratio R1 is larger than the ratio R1 before the change in the traveling direction, and the ratio R2 is smaller than the ratio R2 before the change in the traveling direction. In other words, when the traveling direction of the vehicle C2 changes clockwise, the ratio R1 increases while the ratio R2 decreases. When the traveling direction of the vehicle C2 changes clockwise, the ratios R1 and R2 change as described above, so that the distribution amount of the pre-applied signal S1 increases for the speaker 50-1 arranged on the right side of the vehicle interior CR. At the same time, the distribution amount of the given signal S2 decreases. On the other hand, for the speaker 50-2 arranged on the left side of the vehicle interior CR, the distribution amount of the pre-applied signal S1 decreases and the distribution amount of the applied signal S2 increases. Therefore, it is possible to obtain an audible feeling that the sound flows from right to left.

On the contrary, when the traveling direction of the vehicle C2 changes counterclockwise, the coefficient b decreases from 0.5 to 0 according to the degree of the change. As a result, the ratio R1 is smaller than the ratio R1 before the change in the traveling direction, and the ratio R2 is larger than the ratio R2 before the change in the traveling direction. In other words, when the traveling direction of the vehicle C2 changes counterclockwise, the ratio R1 decreases while the ratio R2 increases. When the traveling direction of the vehicle C2 changes counterclockwise, the ratios R1 and R2 change as described above, so that the distribution amount of the pre-applied signal S1 decreases for the speaker 50-1 arranged on the right side of the vehicle interior CR. At the same time, the distribution amount of the given signal S2 increases. On the other hand, for the speaker 50-2 arranged on the left side of the vehicle interior CR, the distribution amount of the pre-applied signal S1 increases and the distribution amount of the applied signal S2 decreases. Therefore, it is possible to obtain an audible feeling that the sound flows from left to right.

As described above, according to the sound device 10B of the present embodiment, the characteristics of the sounds output from the speakers 50-1 and the speakers 50-2 installed in the passenger compartment CR of the vehicle C2 depend on the traveling direction of the vehicle C2. Change. As a result, a feeling of running is produced, and it becomes possible to improve the fun. Further, the sound device 10B of the present embodiment also has an effect that howling is less likely to occur.

<3. Third Embodiment>
FIG. 7 is a diagram showing a configuration example of an in-vehicle karaoke system 1C including the audio device 10C according to the third embodiment of the present disclosure. In FIG. 7, the same components as those in FIGS. 1 and 4 are designated by the same reference numerals. As is clear from comparing FIGS. 1 and 7, the in-vehicle karaoke system 1C is different from the in-vehicle karaoke system 1A in the following three points. First, the sound device 10C is provided instead of the sound device 10A. Secondly, the traveling state detector 60B is provided in addition to the traveling state detector 60A. Thirdly, it has an amplifier 40-3 and an amplifier 40-4, and a speaker 50-3 and a speaker 50-4.

Although the details will be described later, the sound device 10C uses the sound signal SFR given to the speaker 50-1, the sound signal SFL given to the speaker 50-2, the sound signal SRR given to the speaker 50-3, and the speaker 50-4. The sound signal SRL to be given is generated from the sound signal SA and the accompaniment sound signal S5 and output. The speaker 50-3 is connected to the amplifier 40-3, and the amplifier 40-3 is connected to the sound device 10C. The speaker 50-4 is connected to the amplifier 40-4, and the amplifier 40-4 is connected to the sound device 10C. The amplifier 40-1 amplifies the signal level of the sound signal SFR output from the sound device 10C to a signal level suitable for driving the speaker, and outputs the amplified signal to the speaker 50-1. The amplifier 40-2 amplifies the signal level of the sound signal SFL output from the sound device 10C to a signal level suitable for driving the speaker, and outputs the amplified signal to the speaker 50-2. The amplifier 40-3 amplifies the signal level of the sound signal SRR output from the sound device 10C to a signal level suitable for driving the speaker, and outputs the amplified signal to the speaker 50-3. The amplifier 40-4 amplifies the signal level of the sound signal SRL output from the sound device 10C to a signal level suitable for driving the speaker, and outputs the amplified signal to the speaker 50-4.

FIG. 8 is a plan view of the vehicle C3 equipped with the in-vehicle karaoke system 1C. Also in FIG. 8, the same components as those in FIGS. 2 and 5 are designated by the same reference numerals. In FIG. 8, the A / D converter 30, the amplifiers 40-1 to 40-4, the traveling state detector 60A, and the traveling state detector 60B are not shown.

As shown in FIG. 8, the speakers 50-1 to 50-4 included in the in-vehicle karaoke system 1C are so-called door speakers. The speakers 50-1 to 50-4 are arranged in the passenger compartment CR of the vehicle C3 so that the speakers 50-1 and the speakers 50-2 face each other and the speakers 50-3 and the speakers 50-4 face each other. Specifically, the speaker 50-1 is arranged on the front light door 71 with its sound emitting surface facing the seat 51. The speaker 50-2 is arranged on the front left door 72 with its sound emitting surface facing the seat 52. The speaker 50-3 is arranged on the rear light door 73 with its sound emitting surface facing the seat 53. The speaker 50-4 is arranged on the rear left door 74 with its sound emitting surface facing the seat 54. That is, in the present embodiment, the speaker 50-1 and the speaker 50-3 are arranged on the right side of the passenger compartment CR of the vehicle C3, and the speaker 50-2 and the speaker 50-4 are arranged on the left side of the passenger compartment CR. Further, the speaker 50-1 and the speaker 50-2 are arranged in front of the passenger compartment CR with respect to the speaker 50-3 and the speaker 50-4.

As is clear from a comparison between FIGS. 7 and 1, the difference between the sound device 10C and the sound device 10A is that the adjustment unit 140C is provided instead of the adjustment unit 140A and the mixer 130B is provided instead of the mixer 130A. It is a point. The differences between the adjusting unit 140C and the adjusting unit 140A are the following two points. The first difference is that the smoothing unit 142B and the standardized unit 144B are provided. The second difference is that amplifiers 146-5 to 146-8 are provided. The amplifiers 146-5 to 146-8 correspond to the amplifiers 146-1 to 146-4 of the adjusting unit 140B in the second embodiment. As shown in FIG. 7, the pre-applied signal S1 is given to the amplifier 146-5 and the amplifier 146-6, and the applied signal S2 is given to the amplifier 146-7 and the amplifier 146-8. The amplifier 146-5 multiplies the given pre-grant signal S1 by the coefficient b and outputs the signal to the mixer 130B. The amplifier 146-6 multiplies the given pre-grant signal S1 by a coefficient (1-b) and outputs the signal to the mixer 130B. The amplifier 146-7 multiplies the given given signal S2 by the coefficient b and outputs the signal to the mixer 130B. The amplifier 146-8 multiplies the given given signal S2 by a coefficient (1-b) and outputs the signal to the mixer 130B.

In addition to the accompaniment sound signal S5, the output signals of the amplifiers 146-1 to 146-8 are given to the mixer 130B, and the mixer 130B is based on these signals to each of the speakers 50-1 to 50-4. Sound signals to be given to SFR, SFL, SRR and SRL are generated. More specifically, the mixer 130B includes the output signal of the amplifier 146-1 (a × the signal before addition S1), the output signal of the amplifier 146-4 ((1-a) × the added signal S2), and the amplifier 146-5. The output signal (b × signal S1 before addition), the output signal ((1-b) × added signal S2) of the amplifier 146-8, and the accompaniment sound signal S5 are mixed to generate a sound signal SFR. The mixer 130B uses the output signal of the amplifier 146-1 (a × the signal before addition S1), the output signal of the amplifier 146-4 ((1-a) × the added signal S2), and the output signal of the amplifier 146-6 ((1). -B) × pre-added signal S1), output signal (b × added signal S2) of amplifier 146-7, and accompaniment sound signal S5 are mixed to generate a sound signal SFL. The mixer 130B uses the output signal of the amplifier 146-2 ((1-a) × signal S1 before addition), the output signal of the amplifier 146-3 (a × signal S2), and the output signal of the amplifier 146-5 (b ×). The sound signal SRR is generated by mixing the pre-added signal S1), the output signal ((1-b) × added signal S2) of the amplifier 146-8, and the accompaniment sound signal S5.
The mixer 130B uses the output signal of the amplifier 146-2 ((1-a) × signal S1 before addition), the output signal of the amplifier 146-3 (a × signal S2), and the output signal of the amplifier 146-6 ((1). -B) × pre-added signal S1), output signal (b × added signal S2) of amplifier 146-7, and accompaniment sound signal S5 are mixed to generate a sound signal SRL.

In the present embodiment, the relationship between the coefficient a and the traveling speed is defined as shown in FIG. 3, and the relationship between the coefficient b and the traveling direction is defined as shown in FIG. Therefore, in the present embodiment, when the vehicle C3 is traveling straight at a speed of 50 km / h, a = 0.5 and b = 0.5. In this case, each of the sound signals SFR, SFL, SRR, and SRL becomes a pre-grant signal S1 + a pre-grant signal S2 + an accompaniment sound signal S5, and is a pre-grant signal for each of the speakers 50-1 to 50-4. S1 and the given signal S2 are evenly distributed.

In the process of accelerating from 0 km / h to 100 km / h while the vehicle C3 travels straight, the coefficient a increases from 0.5 to 1.0, while the coefficient b is maintained at 0.5. In this case, as in the case of the first embodiment, for the sound signal SFR and the sound signal SFL, the distribution amount of the pre-assignment signal S1 increases and the distribution amount of the imparted signal S2 decreases, so that the sound signal SRR and the sound signal Regarding SRL, the distribution amount of the applied signal S2 increases and the distribution amount of the pre-assigned signal S1 decreases. Then, when the traveling speed of the vehicle C3 traveling straight reaches 100 km / h, each of the sound signal SFR and the sound signal SFL becomes 1.5 × pre-added signal S1 + 0.5 × added signal S2 + accompaniment sound signal S5. Each of the sound signal SRR and the sound signal SRL becomes 0.5 × pre-added signal S1 + 1.5 × added signal S2 + accompaniment sound signal S5. When the vehicle C3 is traveling straight in this way, the faster the vehicle C3 is in the speed range of 50 km / h to 100 km / h, the more the reverberation of the sound output from the speaker arranged in front of the passenger compartment CR becomes. On the other hand, the reverberation of the sound output from the speaker arranged behind the vehicle interior CR increases, and the audibility that the sound flows from the front to the rear can be obtained.

When the traveling direction of the vehicle C3 changes clockwise while the vehicle C3 is traveling at 50 km / h, the coefficient b increases from 0.5 to 1 according to the degree of the change, while the coefficient a Is maintained at 0.5. In this case, for the sound signal SFR and the sound signal SRR, the distribution amount of the pre-assignment signal S1 increases and the distribution amount of the imparted signal S2 decreases, and for the sound signal SFL and the sound signal SRL, the distribution amount of the pre-application signal S1. Is decreased and the amount of distribution of the given signal S2 is increased. For example, when the traveling direction of the vehicle C3 traveling at 50 km / h changes by 35 °, each of the sound signal SFR and the sound signal SRR becomes 1.5 × pre-added signal S1 + 0.5 × added signal S2 + accompaniment sound signal. S5, and each of the sound signal SFL and the sound signal SRL becomes 0.5 × pre-added signal S1 + 1.5 × added signal S2 + accompaniment sound signal S5. For this reason, the reverberation of the sound output from the speaker located on the right side of the passenger compartment CR is reduced, while the reverberation of the sound output from the speaker located on the left side of the passenger compartment CR is increased, and the sound is emitted from the right. You can get a feeling of flowing to the left.

On the contrary, when the traveling direction of the vehicle C3 changes counterclockwise, the coefficient b decreases from 0.5 to 0 according to the degree of the change. As a result, for the sound signal SFR and the sound signal SRR, the distribution amount of the pre-grant signal S1 decreases and the distribution amount of the applied signal S2 increases, and for the sound signal SFL and the sound signal SRL, the distribution amount of the pre-application signal S1. Increases and the amount of distribution of the given signal S2 decreases. For example, when the traveling direction of the vehicle C3 traveling at 50 km / h changes by −35 °, each of the sound signal SFL and the sound signal SRL becomes 1.5 × pre-added signal S1 + 0.5 × added signal S2 + accompaniment sound. The signal S5, and each of the sound signal SFR and the sound signal SRR becomes 0.5 × pre-added signal S1 + 1.5 × added signal S2 + accompaniment sound signal S5. For this reason, the reverberation of the sound output from the speaker located on the left side of the passenger compartment CR is reduced, while the reverberation of the sound output from the speaker located on the right side of the passenger compartment CR is increased, and the sound is emitted from the left. You can get a feeling of flowing to the right.

As described above, according to the sound device 10C of the present embodiment, the characteristics of the sound output from each of the speakers 50-1 to 50-4 installed in the passenger compartment CR of the vehicle C3 are the traveling speed of the vehicle C3 and the characteristics of the sound. It changes according to the traveling direction. As a result, a feeling of running is produced, and it becomes possible to improve the fun. Further, the sound device 10C of the present embodiment also has an effect that howling is less likely to occur.

<4. Modification example>
The above embodiments can be modified in various ways. A specific mode of modification is illustrated below. Two or more embodiments arbitrarily selected from the examples below can be appropriately merged as long as they do not conflict with each other.

<4-1. Modification 1>
In each of the above embodiments, the ratio R1 and the ratio R2 are adjusted according to changes in the traveling state of the vehicle such as the traveling speed or the traveling direction of the vehicle. However, the ratio R1 and the ratio R2 may be adjusted according to the operation for changing the traveling state of the vehicle. Specific examples of the operation for changing the traveling state of the vehicle include depressing the accelerator pedal, which is an operation for accelerating the vehicle, and a steering wheel operation, which is an operation for changing the traveling direction of the vehicle.
Further, when the vehicle is stopped, the ratio R1 and the ratio R2 may be adjusted according to the operating state. For example, the ratio R1 and the ratio R2 may be adjusted based on at least one of the accelerator petal depression amount and the hand operation amount.

For example, in the case of the in-vehicle karaoke system 1A of the first embodiment or the in-vehicle karaoke system 1C of the third embodiment, a communication device that communicates with a CAN (Controller Area Network) laid in the vehicle is used as a traveling state detector 60A. In use, the traveling state detector 60A is made to acquire the accelerator opening degree indicating the amount of depression of the accelerator pedal via CAN. Then, in the adjusting unit 140A, the ratio R1 when the accelerator opening is large is made larger than the ratio R1 when the accelerator opening is small, and the ratio R2 when the accelerator opening is large is set to the ratio R2 when the accelerator opening is small. A process of making the ratio smaller than R2 is executed.

Further, in the case of the in-vehicle karaoke system 1B of the second embodiment or the in-vehicle karaoke system 1C of the third embodiment, a communication device that communicates with CAN is used as the traveling state detector 60B, and the traveling state detector 60B has a steering wheel. The steering angle representing the amount of operation is acquired via CAN. Then, in the adjusting unit 140B, the ratio R1 when the clockwise steering angle is large is made larger than the ratio R1 when the same angle is small, and the ratio R2 when the same angle is large is set to the ratio when the same angle is small. When the process of making it smaller than R2 is executed, the ratio R1 when the counterclockwise steering angle is large is made smaller than the ratio R1 when the same angle is small, and the ratio R2 when the same angle is large is smaller than the same angle. The process of making the ratio R2 larger than that of R2 is executed.

<4-2. Modification 2>
Although the application example of the present disclosure to the vehicle-mounted karaoke system has been described in each of the above-described embodiments, the sound device 10A, the sound device 10B, and the sound device 10C may be applied to the vehicle-mounted hands-free telephone. When the sound device 10A, the sound device 10B, and the sound device 10C are applied to an in-vehicle hands-free telephone, it is not necessary to give the accompaniment sound signal S5 to the noise removing unit 100, and the noise removing unit 100 is a microphone arranged in the vehicle interior. A process of removing low-frequency noise from the output signal SA of 20 to generate an output signal SB may be executed. Further, if a super-directional microphone is used as the microphone 20 and the microphone 20 is provided so that the noise source is located outside the sound collection range of the microphone 20, the sound device 10A, the sound device 10B, and the sound device 10C can be used. The noise removing unit 100 may be omitted from the configuration. Further, if each of the speaker 50-1 and the speaker 50-2 is installed outside the sound collection range of the microphone 20, the howling suppression unit 110 is omitted from the configurations of the sound device 10A, the sound device 10B, and the sound device 10C. You may.

Further, the application target of the acoustic device 10A, the acoustic device 10B and the acoustic device 10C is not limited to the in-vehicle acoustic system including the microphone such as the in-vehicle hands-free telephone or the in-vehicle karaoke system, and the acoustic device 10A, the acoustic device 10B and the acoustic device 10A and the acoustic device 10B. The device 10C can also be applied to an in-vehicle audio system that does not include a microphone, such as a car stereo. Specifically, a playback device such as a music CD may be used as a signal source for the sound signal SA.

<4-3. Modification 3>
Although the noise removing unit 100, the howling suppressing unit 110, the effect applying unit 120, the mixer 130A, and the adjusting unit 140A in the first embodiment are software modules, each of these units may be realized by an electronic circuit. Similarly, the noise removing unit 100, howling suppressing unit 110, effect applying unit 120, mixer 130A, and adjusting unit 140B in the second embodiment may be realized by an electronic circuit, and the noise removing unit 100 in the third embodiment may be realized in the same manner. The howling suppression unit 110, the effect imparting unit 120, the mixer 130B, and the adjustment unit 140C may also be realized by electronic circuits in the same manner.

<5. Aspects grasped from at least one of the embodiments and each modification>
The following aspects are grasped from at least one of the above-described embodiment and each modification.
One aspect of the sound device is an effect imparting unit that generates a second sound signal by subjecting the first sound signal to signal processing for imparting an acoustic effect, and a third speaker provided in the vehicle interior. Is generated by mixing the first sound signal and the second sound signal at the first ratio, and the fourth sound signal given to the second speaker provided in the passenger compartment is generated. Adjustment that adjusts the mixer generated by mixing the first sound signal and the second sound signal at the second ratio, and the first ratio and the second ratio according to the running state of the vehicle. It has a part and. According to this aspect, the characteristics of the sound output from the first speaker and the second speaker change according to the change in the traveling state of the vehicle. As a result of producing a feeling of running by changing the characteristics of the sounds output from the first speaker and the second speaker, the fun of operating the vehicle is improved.

As one aspect of the above-mentioned audio device, the first ratio and the second ratio may have a reciprocal relationship.

As one aspect of the above-mentioned acoustic device, the adjusting unit may adjust the first ratio and the second ratio according to the speed of the vehicle. According to this aspect, the sound output from the first speaker and the sound output from the second speaker can be adjusted according to the speed of the vehicle.

As one aspect of the above-mentioned acoustic device, the first speaker may be provided in front of the passenger compartment with respect to the second speaker. According to this aspect, since the first speaker is provided in the direction in which the vehicle advances from the second speaker, it is possible to adjust the sound output from the front of the passenger compartment and the sound output from the rear of the passenger compartment. it can.

As one aspect of the above-mentioned acoustic device, the adjusting unit makes the first ratio when the speed of the vehicle is high is larger than the first ratio when the speed of the vehicle is low. However, the second ratio when the speed of the vehicle is high may be smaller than the second ratio when the speed of the vehicle is low.

As one aspect of the above-mentioned acoustic device, the adjusting unit may adjust the first ratio and the second ratio according to a change in the traveling direction of the vehicle.

As one aspect of the above-mentioned acoustic device, the first speaker may be provided on one of the left side and the right side of the passenger compartment, and the second speaker may be provided on the other side. According to this aspect, the sound emitted from the right side of the passenger compartment and the sound emitted from the left side of the passenger compartment can be adjusted.

As one aspect of the above-mentioned acoustic device, when the traveling direction of the vehicle changes counterclockwise, the adjusting unit increases the first ratio as compared with the first ratio before the change and also increases the first ratio. When the ratio of 2 is made smaller than the second ratio before the change and the traveling direction of the vehicle changes clockwise, the first ratio is compared with the first ratio before the change. The second ratio may be smaller and larger than the second ratio before the change. According to this aspect, the sound output from the first speaker and the sound output from the second speaker can be adjusted in conjunction with the traveling direction.

As one aspect of the above-mentioned acoustic device, a howling suppression process is applied to a noise removing unit that outputs a signal obtained by removing low-frequency noise from the output signal of a microphone arranged in the passenger compartment and an output signal from the noise removing unit. It may have a howling suppressing unit which is applied to generate the first sound signal. According to this aspect, road noise and the like can be removed and howling can be suppressed.

As one aspect of the above-mentioned acoustic device, the mixer mixes the first sound signal and the second sound signal at the first ratio, and further mixes the fifth sound signal representing the accompaniment sound of karaoke. The third sound signal is generated, the first sound signal and the second sound signal are mixed at the second ratio, and the fifth sound signal is further mixed to obtain the fourth sound signal. The sound signal of the fifth sound signal may be generated, and the noise removing unit may remove the signal component of the fifth sound signal from the output signal of the microphone in addition to the noise. According to this aspect, when singing using karaoke in the passenger compartment, a feeling of running can be produced.

One aspect of the vehicle includes the acoustic device of any one of the above aspects, the first speaker, and the second speaker.

1A, 1B, 1C ... In-vehicle karaoke system, 10A, 10B, 10C ... Sound device, 20 ... Microphone, 30 ... A / D converter, 40-1, 40-2, 40-3, 40-4 ... Amplifier, 50 -1,50-2,50-3,50-4 ... Speaker, 60A, 60B ... Running state detector, 100 ... Noise removal unit, 110 ... Howling suppression unit, 120 ... Effect imparting unit, 130A, 130B ... Mixer, 140A, 140B, 140C ... Adjustment unit, 142A, 142B ... Smoothing unit, 144A, 144B ... Standardization unit, 146-1, 146-2, 146-3, 146-4, 146-5, 146-6,146 -7, 146-8 ... Multiplying part.

Claims (11)

An effect-imparting unit that generates a second sound signal by performing signal processing on the first sound signal to add an acoustic effect.
A third sound signal given to the first speaker provided in the passenger compartment is generated by mixing the first sound signal and the second sound signal at the first ratio, and is provided in the passenger compartment. A mixer generated by mixing the first sound signal and the second sound signal at a second ratio to generate a fourth sound signal given to the second speaker.
An adjustment unit that adjusts the first ratio and the second ratio according to the running condition of the vehicle, and
Has an audio device. The acoustic device according to claim 1, wherein the first ratio and the second ratio have a reciprocal relationship. The adjusting unit adjusts the first ratio and the second ratio according to the speed of the vehicle.
The audio device according to claim 1 or 2. The first speaker is provided in front of the passenger compartment with respect to the second speaker.
The acoustic device according to claim 3. The adjusting part
The first ratio when the speed of the vehicle is high is increased as compared with the first ratio when the speed of the vehicle is low.
The second ratio when the speed of the vehicle is high is made smaller than the second ratio when the speed of the vehicle is low.
The acoustic device according to claim 3 or 4. The adjusting unit adjusts the first ratio and the second ratio according to a change in the traveling direction of the vehicle.
The audio device according to claim 1 or 2. The first speaker is provided on one of the left side and the right side of the passenger compartment, and the second speaker is provided on the other side.
The acoustic device according to claim 6. The adjusting part
When the traveling direction of the vehicle changes counterclockwise, the first ratio is increased in comparison with the first ratio before the change, and the second ratio is compared with the second ratio before the change. And make it smaller
When the traveling direction of the vehicle changes clockwise, the first ratio is made smaller than the first ratio before the change, and the second ratio is compared with the second ratio before the change. Make it bigger
The acoustic device according to claim 6 or 7. A noise removing unit that outputs a signal obtained by removing low-frequency noise from the output signal of the microphone arranged in the passenger compartment,
A howling suppression unit that generates the first sound signal by performing howling suppression processing on the output signal from the noise removal unit, and
The acoustic device according to any one of claims 1 to 8. The mixer is
The first sound signal and the second sound signal are mixed at the first ratio, and the fifth sound signal representing the accompaniment sound of karaoke is further mixed to generate the third sound signal. The first sound signal and the second sound signal are mixed at the second ratio, and the fifth sound signal is further mixed to generate the fourth sound signal.
The noise removing unit is
In addition to the noise, the signal component of the fifth sound signal is removed from the output signal of the microphone.
The acoustic device according to claim 9. The audio equipment according to any one of claims 1 to 10.
With the first speaker
With the second speaker
Vehicles with.

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