WO2023058410A1

WO2023058410A1 - Sound reproduction device and sound reproduction method

Info

Publication number: WO2023058410A1
Application number: PCT/JP2022/033986
Authority: WO
Inventors: 春俊吉村; 健二山田
Original assignee: ソニーグループ株式会社
Priority date: 2021-10-04
Filing date: 2022-09-12
Publication date: 2023-04-13

Abstract

For example, the present invention helps a user easily obtain the feeling of spatial expansion of a sound.　A sound reproduction device having a first speaker unit that reproduces a high-frequency sound higher than or equal to a prescribed frequency, the angle formed by the first sound wave radiation direction of the first speaker unit and the second sound wave radiation direction of a second speaker unit being 30° or greater.

Description

SOUND REPRODUCTION DEVICE AND SOUND REPRODUCTION METHOD

The present disclosure relates to an audio reproduction device and an audio reproduction method.

A sound reproduction device has been proposed in which speaker units with different reproduction frequency bands are provided for the housing (see, for example, Patent Document 1 below).

Japanese Patent Application Laid-Open No. 2021-40311

In this field, there is a demand for a sound reproduction device that can provide a reproduction space in which a feeling of spaciousness and the like can be obtained with as little burden on the user as possible.

One object of the present disclosure is to provide a sound reproduction device and a sound reproduction method that can provide a reproduction space in which, for example, a feeling of spaciousness of sound can be obtained.

The present disclosure, for example,
Having a first speaker unit that reproduces high-frequency sound of a predetermined frequency or higher,
In the sound reproducing device, the angle formed by the first sound wave radiation direction of the first speaker unit and the second sound wave radiation direction of the second speaker unit is 30° or more.

This disclosure is
High-range sound of a predetermined frequency or higher in the sound reproduced from the video reproduction device from a speaker unit having a sound wave emission direction that forms an angle of 30° or more with the sound wave emission direction of the video reproduction device. This is a sound reproduction method for reproducing in synchronism with the reproduction of the

It is a figure referred when explaining the problem which should be considered in embodiment. It is a figure referred when explaining the problem which should be considered in embodiment. It is a figure referred when explaining the problem which should be considered in embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating the outline|summary of embodiment. 1 is a diagram for explaining a configuration example of a sound reproducing device according to an embodiment; FIG. 1 is a diagram for explaining a configuration example of a sound reproducing device according to an embodiment; FIG. 1 is a diagram for explaining a configuration example of a sound reproducing device according to an embodiment; FIG. 1 is a diagram for explaining a configuration example of a sound reproducing device according to an embodiment; FIG. FIG. 4 is a diagram referred to when describing the directivity of a side tweeter unit and a rear tweeter unit according to one embodiment; FIG. 4 is a diagram for explaining directivity of a side tweeter unit according to one embodiment; FIG. 4 is a diagram for explaining the directivity of a rear tweeter unit according to one embodiment; 1 is a diagram referred to when describing an example of an electrical configuration of a sound reproducing device according to an embodiment; FIG. It is a figure referred when explaining the example of use of the sound reproduction device concerning one embodiment. It is a figure referred when explaining the example of use of the sound reproduction device concerning one embodiment. It is a figure referred when explaining the example of use of the sound reproduction device concerning one embodiment. It is a figure referred when explaining the example of use of the sound reproduction device concerning one embodiment.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The description will be made in the following order.
<Problems to be considered in the embodiment>
<One embodiment>
<Modification>
The embodiments and the like described below are preferred specific examples of the present disclosure, and the content of the present disclosure is not limited to these embodiments and the like.
In addition, unless there is a description to the effect that the dimensions, materials, shapes, relative positions, and directions such as up, down, left, and right of the constituent members described in the embodiments are particularly limited, the scope of the present disclosure is limited to them. It is not intended to be limited to , but is merely an example of explanation. It should be noted that the sizes and positional relationships of members shown in each drawing may be exaggerated for clarity of explanation. In some cases, they may be illustrated or part of the illustration may be simplified. Furthermore, in the following description, the same names and symbols indicate the same or homogeneous members, and overlapping descriptions will be omitted as appropriate.

<Problem and outline to be considered in the embodiment>
First, in order to facilitate understanding of the present disclosure, an outline of the present embodiment will be described while describing problems to be considered in the present embodiment.

In recent years, video playback devices have become thinner and narrower. Here, the video reproduction device is a device that reproduces video and sound in synchronization, and in this example, a television receiver will be described as an example. Of course, the video playback device may be a device other than the television receiver, such as a personal computer. Due to the shape restrictions of the television receiver described above, the speaker unit of the television receiver has a small diameter or faces downward (facing the installation surface). As a result, the sound reproduced from the television receiver is often not ideal in terms of sound pressure and sound quality.

Therefore, technology has been proposed to realize a high-quality sound reproduction space by complementing the sound reproduced from the television receiver. FIG. 1 shows a first example of such technology. As shown in FIG. 1, a television receiver 2 is arranged in front of a user 1 . The user 1 listens to the sound reproduced from the left and right speakers of the television receiver 2 while watching the video displayed on the display unit 2A of the television receiver 2 . A reproduced sound reproduced from the left direction and a reproduced sound reproduced from the right direction with respect to the user 1 are schematically shown as 3L and 3R, respectively.

There is a limit to increasing the sound pressure with only the reproduced

sounds

3L and 3R reproduced from the speaker unit of the television receiver 2. Therefore, as shown in FIG. 1, subwoofers (SW ) 4 outputs only low frequency components of the sound reproduced from the television receiver 2 . As a result, it is possible to enhance the low-frequency components that tend to be insufficient in the sound reproduced from the television receiver 2 and that have little effect on the localization of the reproduced

sounds

3L and 3R.

According to the first example, it is possible to complement the low frequency components without disturbing the localization of the reproduced

sounds

3L and 3R. However, since only the low-frequency component of the reproduced sound can be complemented, it is possible to improve the clarity of the human voice contained in the sound reproduced from the television receiver 2 and to improve the spread of the sound. is not sufficient.

Fig. 2 shows a second example of technology for realizing a high-quality sound reproduction space. In the second example, no sound is reproduced from the television receiver 2 . Instead, the sound is reproduced from

reproduction devices

5L and 5R that are separate from the television receiver 2. FIG. For example, a reproduced sound 3L is reproduced from the reproducing device 5L, and a reproduced sound 3R is reproduced from the reproducing device 5R. The

playback devices

5L and 5R may be integrated devices such as a sound bar, or independent playback devices such as AV (Audio Visual) amplifiers. Also, in the second example, the subwoofer 4 described in the first example may be used. The

playback devices

5L and 5R are positioned substantially symmetrical about the center line of the television receiver 2, for example, so that the user 1 of the television receiver 2 does not feel uncomfortable with the localization of the sound image, and It is arranged at a position close to the television receiver 2 .

According to the second example, although the quality of the reproduced sound can be improved, it is necessary to arrange a plurality of reproduction devices (in this example, the

reproduction devices

5L and 5R (the subwoofer 4 may be used)). space is required. Depending on the size of the space, there may be restrictions on the size and shape of the

playback devices

5L and 5R. Therefore, there is a possibility that the sound quality improvement by the reproducing

devices

5L and 5R will be insufficient.

FIG. 3 shows a third example of technology for realizing a high-quality sound reproduction space. In the third example, as in the second example, the television receiver 2 does not reproduce sound. Instead, the sound is reproduced using the speaker device 6 having sufficient sound reproduction capability. Such a speaker device 6 becomes relatively large, and when placed in front of the television receiver 2, it obstructs the visual recognition of the television receiver 2. FIG. Therefore, the speaker device 6 is placed at a position slightly away from the center axis of the television receiver 2 .

The speaker device 6 has, for example, a speaker unit (woofer) 6A for reproducing low frequencies, and speaker units (midrange and tweeter) 6B and 6C for reproducing medium and high frequencies. The speaker unit 6A reproduces sounds of low frequency components including the L (Left) channel and the R (Right) channel. The speaker unit 6B reproduces the sound of the middle and high frequency components of the L channel, and the speaker unit 6C reproduces the sound of the middle and high frequency components of the R channel.

According to the third example, the quality of reproduced sound can be improved by using the speaker device 6 having sufficient sound reproduction capability. However, while the image is displayed on the display section 2A substantially in front of the user 1, the sound is reproduced from the right side of the user 1. FIG. That is, the positional deviation between the displayed image and the reproduced sound becomes large, which may give the user 1 a sense of discomfort.

In this way, there were inadequate points in the technology that has been used to realize a high-quality sound reproduction space. Therefore, in the present embodiment, as shown in FIG. 4, while reproducing sound from the television receiver 2, sound is reproduced from the reproduction device 7 (sound reproduction device 100 in one embodiment described later). . The playback device 7 is arranged, for example, on the left or right side of the television receiver 2 .

The playback device 7 has, for example,

speaker units

7A and 7B that are installed so that the sound hardly reaches the user 1 positioned in front of the television receiver 2 directly. The

speaker units

7A and 7B are speaker units (tweeters) for reproducing high frequencies. A reproduced sound 7L, which is a high-frequency component of the sound reproduced from the television receiver 2 (the reproduced sound of the L channel), is reproduced from the speaker unit 7A. A reproduced sound 7R, which is a high-frequency component of a reproduced sound (reproduced sound of the R channel) reproduced from the television receiver 2, is reproduced from the speaker unit 7B.

Sound is reproduced from the television receiving device 2, and the direct sound of the sound reproduced from the reproducing device 7 does not reach the user 1. Therefore, the sound reproduced by the television receiver 2 does not cause the localization position held by the user 1 to be extremely displaced. In addition, the reproduced sounds 7L and 7R reproduced from the reproducing device 7 allow the user 1 to hear clear high-frequency components of the reproduced sounds reproduced from the television receiving device 2, and to obtain a sense of sound spread. can. In addition, the user 1 can hear the reflected sounds of the reproduced sounds 3L and 3R reflected by the walls and ceiling in the reproduction space, so that the user 1 can further obtain a sense of the spread of the sound. An embodiment of the present disclosure will be described in further detail below.

<One embodiment>
[Sound reproduction device]
(Overall configuration example)
A sound reproducing device 100 according to an embodiment will be described with reference to FIGS. 5 to 8. FIG. As illustrated, the sound reproduction device 100 has a housing 101 that functions as an enclosure. The housing 101 is made of resin, but metal, glass, or the like may be used wholly or partially. Also, the sound reproduced by the sound reproduction device 100 may be anything such as a human voice, music, natural sounds, and sounds including these.

The housing 101 has, for example, a square prism shape. Specifically, the housing 101 includes a front portion 102, a side portion 103 (an example of a first side portion) extending in a direction substantially orthogonal to the front portion 102, and a side portion 104 opposite to the side portion 103. (An example of a second side surface portion), a back surface portion 105 opposite to the front surface portion 102 , a top surface portion 106 , and a bottom surface portion 107 opposite to the top surface portion 106 . The sound reproducing device 100 is used with the bottom portion 107 facing down.

A busless duct is provided in the front part 102 . For example, two

busless ducts

110A and 110B are provided below the front portion 102 . A plurality of speaker units are provided on the front portion 102 . One of them is a woofer unit 111, which is an example of a second speaker unit and is a speaker unit for reproducing low frequencies. Above the woofer unit 111,

mid-range units

112A and 112B, which are speaker units for reproducing mid-range frequencies, are arranged side by side. A front tweeter unit 113A, which is a speaker unit for reproducing high frequencies, is provided above the midrange unit 112A in the front portion 102. As shown in FIG. A front tweeter unit 113B, which is a speaker unit for reproducing high frequencies, is provided above the midrange unit 112B in the front portion 102 .

A side tweeter unit 123, which is a speaker unit for reproducing high frequencies, is provided on the upper side of the side portion 103. A side tweeter unit 124, which is a speaker unit for reproducing high frequencies, is provided on the upper side of the side portion 104 (substantially opposite to the side tweeter unit 123). Both or one of the

side tweeter units

123 and 124, which are a pair of speaker units having different sound wave radiation directions (the sound wave radiation direction (radiation axis) or the center axis of the speaker unit), provide a third speaker. unit is constructed.

In addition,

rear tweeter units

126A and 126B, which are speaker units for high-frequency reproduction and whose sound wave radiation direction is slightly backward, are provided on the upper surface portion 106 so as to be aligned left and right. Both or one of the

rear tweeter units

126A and 126B, which are a pair of speaker units radiating sound waves in different directions, constitute a fourth speaker unit.

The back surface 105 is provided with an interface 130 (see FIG. 8) to which a cable or the like for supplying a sound source (hereinafter also referred to as a source as appropriate) is connected.

In this embodiment, all or part of the side tweeter unit 123, the side tweeter unit 124, the rear tweeter unit 126A, and the rear tweeter unit 126B correspond to the first speaker unit that reproduces high frequencies above a predetermined frequency. ing. Here, the high frequency range of a predetermined frequency or higher includes sounds of 5 kHz or higher. A sound of 5 kHz or higher can be obtained, for example, by passing a predetermined audio signal through a high-pass filter whose cutoff frequency is 5 kHz. The sound of 5 kHz or higher is not limited to the sound obtained using a high-pass filter, and may be, for example, a sound with frequency characteristics in which a band around 5 kHz is boosted for elderly people who have reduced hearing of high-frequency components. .

(Each directivity of the side tweeter unit and the rear tweeter unit)
As an example, the

side tweeter units

123 and 124 are tweeter units with narrow directivity (narrow directivity). As a specific example, horn-type speaker units with narrow directivity are used as the

side tweeter units

123 and 124 .

On the other hand, for the

rear tweeter units

126A and 126B, tweeter units with wider directivity than the

side tweeter units

123 and 124 are used. As a specific example, tweeter units with a diameter of 4 cm are used as the

rear tweeter units

126A and 126B.

As shown in FIG. 9, when the sound reproduction device 100 is viewed from above, a speaker unit (here, referred to as a woofer unit 111, but a midrange unit) provided on the front portion 102 of the housing 101 of the sound reproduction device 100 or a front tweeter unit) is assumed to be a sound wave emitting direction RD1. Further, the sound wave emission direction of the side tweeter unit 123 is the sound wave emission direction RD2, the sound wave emission direction of the side tweeter unit 124 is the sound wave emission direction RD3, the sound wave emission direction of the rear tweeter unit 126A is the sound wave emission direction RD4, and the sound wave emission direction of the rear tweeter unit 126B is the sound wave emission direction RD4. Let the radiation direction be a sound wave radiation direction RD5.

For example, at least one of the sound wave radiation directions RD2, RD3, RD4, and RD5 corresponds to the first sound wave radiation direction, and the sound wave radiation direction RD1 corresponds to an example of the second sound wave radiation direction. Specifically, at least one of the sound wave radiation directions RD2 and RD3 corresponds to an example of the third sound wave radiation direction, and at least one of the sound wave radiation directions RD4 and RD5 corresponds to an example of the fourth sound wave radiation direction.

For example, the side tweeter unit 123 is provided in the housing 101 so that the angle formed by the sound wave radiation direction RD1 and the sound wave radiation direction RD2 is 30° or more. Further, the side tweeter unit 124 is provided in the housing 101 so that the angle formed by the sound wave radiation direction RD1 and the sound wave radiation direction RD3 is 30° or more. Further, the rear tweeter unit 126A is provided in the housing 101 so that the angle formed by the sound wave radiation direction RD1 and the sound wave radiation direction RD4 is 30° or more. Further, the rear tweeter unit 126B is provided in the housing 101 so that the angle formed by the sound wave radiation direction RD1 and the sound wave radiation direction RD5 is 30° or more.

Furthermore, when the

side tweeter units

123 and 124 and the

rear tweeter units

126A and 126B are provided in the housing 101 as in the present embodiment, the sound wave radiation direction RD1 and the sound wave radiation direction RD2 (or the sound wave radiation direction RD3) Each tweeter unit is provided such that the angle (first angle) formed is smaller than the angle (second angle) formed between the sound wave radiation direction RD1 and the sound wave radiation direction RD4 (or the sound wave radiation direction RD5). Within this range, the tweeter units are provided such that a predetermined direction is the sound wave radiation direction, taking into consideration the directivity of each tweeter unit.

FIG. 10 is a graph showing the directivity of the side tweeter unit 123 (the same applies to the directivity of the side tweeter unit 124) according to one embodiment. In the graph of FIG. 10, the horizontal axis indicates frequency (Hz), and the vertical axis indicates sound pressure level (dB). For example, looking at 5 kHz, which is the reproduction band of the side tweeter unit 123, when the sound wave radiation direction RD2 is 0°, the sound pressure level at 0° is approximately 90 dB, whereas the sound at 60° is approximately 90 dB. The pressure level is approximately 70 dB, which significantly reduces the sound pressure level. That is, the directivity is narrow. Since the sound pressure level of high frequency (for example, 5 kHz) sound is 70 dB or less in the range of 60 ° or more, a user who is facing the sound reproduction device 100 or a television receiver (television reception device described later) The sound reproduced from the

side tweeter units

123 and 124 reaches the position where the user of the device 200) is supposed to be (the range between the line LN1 and the line LN2 (narrow side) in FIG. 9) as a direct sound. can be suppressed.

FIG. 11 is a graph showing the directivity of the rear tweeter unit 126A (the same applies to the directivity of the rear tweeter unit 126B) according to one embodiment. In the graph of FIG. 11, the horizontal axis indicates frequency (Hz), and the vertical axis indicates sound pressure level (dB). For example, when viewed at 5 kHz, which is the reproduction band of the rear tweeter unit 126A, when the sound wave radiation direction RD4 is 0°, the sound pressure level at 0° is approximately a little less than 80 dB, whereas at 120° The sound pressure level is approximately a little less than 70 dB, and the sound pressure level does not decrease so much. That is, the directivity is widened. Since the sound pressure level of high frequency (for example, 5 kHz) sound is 70 dB or less in the range of 120 ° or more, a user who is facing the sound reproduction device 100 or a television receiver (television reception device described later) The sound reproduced from the

rear tweeter units

126A and 126B reaches the position where the user of the device 200) is assumed to be (the narrow side range between the lines LN1 and LN2 in FIG. 9) as direct sound. can be suppressed.

[Configuration example of sound reproduction system]
Next, a sound reproduction system according to one embodiment will be described with reference to FIG. The sound reproduction system may include, for example, the sound reproduction device 100 and the television receiver 200 described above. A source signal including a video signal and an audio signal (hereinafter referred to as a source signal SC as appropriate) is supplied to the sound reproducing device 100 and the television receiving device 200 . Examples of the source signal SC include a television broadcast signal, a signal supplied via a network such as the Internet, a signal recorded on a semiconductor recording medium, a magnetic recording medium, an optical recording medium, and the like. As will be described later, the sound reproducing device 100 may be used alone without using the television receiving device 200 in some cases. In this case, only audio signals are supplied to the sound reproduction device 100 . Also, the source signal SC may be supplied to the sound reproduction device 100 via the television receiver 200 . Also, the source signal SC may be supplied to the sound reproduction device 100 by wire, or may be supplied wirelessly such as Bluetooth (registered trademark).

(Electrical Configuration Example of Sound Player)
The sound reproduction device 100 includes, as an electrical configuration, a digital signal processing unit 151, an (L+R) processing unit 152, an LPF (Low Pass Filter) 153, a BPF (Band Pass Filter) 154, a first HPF (High Pass Filter) 155, and a second HPF 156 .

The digital signal processing unit 151 is configured by, for example, a DSP (Digital Signal Processor). The digital signal processing unit 151 performs known audio signal processing on the source signal SC, such as equalizing processing for correcting frequency characteristics of the audio signal, volume adjustment processing, and the like. By adjusting the volume of the audio signal supplied to the subsequent stage by volume adjustment processing by the digital signal processing unit 151, it is possible to control the presence or absence and level of audio output from a predetermined speaker unit. A digital audio signal that has been subjected to signal processing by the digital signal processing unit 151 (for example, two-channel audio signals of an L channel and an R channel) is sent to each of the (L+R) processing unit 152, BPF 154, first HPF 155, and second HPF 156. supplied by

The (L+R) processing unit 152 generates a one-channel audio signal ((L+R) audio signal) by adding the two-channel audio signals supplied from the digital signal processing unit 151 . The one-channel audio signal generated by the (L+R) processing unit 152 is supplied to the LPF 153 .

The LPF 153 passes only audio signals with a predetermined cutoff frequency or less among the one-channel audio signals supplied from the (L+R) processing unit 152 . A cutoff frequency is, for example, 100 Hz. The audio signal that has passed through the LPF 153 is converted to an analog audio signal by a D/A (Digital to Analog) converter (not shown), and then reproduced from the woofer unit 111 .

The BPF 154 passes only audio signals in a predetermined frequency band among the two-channel audio signals supplied from the digital signal processing unit 151 . The predetermined frequency band is, for example, a band ranging from 400 Hz to 4 kHz. The L-channel audio signal that has passed through the BPF 154 is converted into an analog audio signal by a D/A converter (not shown) and then reproduced from the midrange unit 112A. Also, the R-channel audio signal that has passed through the BPF 154 is converted into an analog audio signal by a D/A converter (not shown) and then reproduced from the midrange unit 112B.

The first HPF 155 passes only audio signals having a predetermined cutoff frequency or higher among the two-channel audio signals supplied from the digital signal processing unit 151 . The predetermined cutoff frequency is set between 2 kHz and 3 kHz, for example. The L-channel audio signal that has passed through the first HPF 155 is converted into an analog audio signal by a D/A converter (not shown) and then reproduced from the front tweeter unit 113A. Also, the R-channel audio signal that has passed through the first HPF 155 is converted into an analog audio signal by a D/A converter (not shown) and then reproduced from the front tweeter unit 113B.

The second HPF 156 passes only audio signals having a predetermined cutoff frequency or higher among the two-channel audio signals supplied from the digital signal processing unit 151 . The predetermined cutoff frequency is set to 5 kHz, for example. The L-channel audio signal that has passed through the second HPF 156 is converted into an analog audio signal by a D/A converter (not shown), and then reproduced from the side tweeter unit 124 and the rear tweeter unit 126A. Also, the R-channel audio signal that has passed through the second HPF 156 is converted into an analog audio signal by a D/A converter (not shown) and then reproduced from the side tweeter unit 123 and the rear tweeter unit 126B.

(Example of electrical configuration of television receiver)
Next, the electrical configuration of television receiver 200 will be described. The television receiver 200 generally has a signal processing section 201 , a speaker 202 and a display section 203 .

The signal processing unit 201 performs known signal processing on the source signal SC. For example, when the source signal SC is a television broadcast signal, the signal processing unit 201 performs demodulation processing, signal processing for separating video and audio, and the like. A video signal subjected to signal processing by the signal processing unit 201 is displayed on the display unit 203 , and an audio signal is reproduced from the speaker 202 . Although one speaker 202 is shown in FIG. 12, the television receiver 200 may have two speakers corresponding to the audio signals of the L and R channels. The display unit 203 is a display device such as an LCD (Liquid Crystal Display) or an organic EL (Electro Luminescence).

[Example of use of sound reproduction device]
Next, a usage example of the sound reproduction device 100 will be described. The sound reproduction device 100 can be used alone (single) as an audio reproduction device (hereinafter, such a usage example is also referred to as independent reproduction as appropriate). Also, the sound reproducing device 100 can be used in a mode of reproducing sound in synchronization with the reproduction of the television receiving device 200 (hereinafter, such an example of use is also referred to as cooperative reproduction as appropriate). For example, the digital signal processing unit 151 of the sound reproduction device 100 determines whether the mode of use of the sound reproduction device 100 is independent reproduction or cooperative reproduction. For example, the digital signal processing unit 151 checks the setting of the sound reproduction device 100 by the user 1 to determine whether the reproduction is single reproduction or cooperative reproduction. The digital signal processing unit 151 may automatically determine whether the reproduction is single reproduction or cooperative reproduction based on the presence or absence of audio input from the television receiver 200 . The above determination may be made by a functional block other than the digital signal processing unit 151 (for example, a control unit such as a CPU (Central Processing Unit)).

FIG. 13 is a diagram schematically showing the arrangement of the sound reproduction device 100 during single reproduction. For example, the sound reproducing device 100 is arranged at a position directly facing the user 1 (a position where the user 1 faces the front part 102 of the sound reproducing device 100). At the time of independent reproduction, for example, sound is reproduced from all speaker units of the sound reproduction device 100 . The sound reproduction device 100 has a speaker unit covering low to high frequencies in the front portion 102, and has sufficient reproduction capability from low to high frequencies. Therefore, the user 1 can experience audio reproduction with sufficient sound quality. Furthermore, by reproducing sound from the

side tweeter units

123, 124 and the

rear tweeter units

126A, 126B, the user 1 can obtain a wider feeling of sound compared to a sound reproduction device having speaker units only in the front part. .

FIG. 14 is a diagram schematically showing the arrangement of the sound reproduction device 100 during cooperative reproduction. The sound reproducing device 100 is arranged adjacent to the television receiving device 200, for example. In FIG. 14, the sound reproduction device 100 is arranged to the left of the television receiver 200 with respect to the user 1, but it may be arranged to the right.

Sound is reproduced from the television receiver 200 during cooperative reproduction. Also, the woofer unit 111 of the sound reproduction device 100 reproduces the low-frequency component of the sound reproduced from the television receiver 200 . Also, the

side tweeter units

123 and 124 and the

rear tweeter units

126A and 126B of the sound reproduction device 100 reproduce high frequency components (for example, 5 kHz or higher) of the sound reproduced from the television receiver 200 . No sound is reproduced from the midrange units 112A and 122B and the

front tweeter units

113A and 113B of the sound reproduction device 100. FIG. Such sound output control is performed by volume adjustment processing or the like by the digital signal processing unit 151 .

FIG. 15 is a diagram showing the presence or absence of sound output from each speaker unit in each of independent reproduction and cooperative reproduction. In the figure, "O" indicates that sound is output, and "X" indicates that sound is not output.

Due to the reproduction control shown in FIG. 15, sound is reproduced from the television receiver 200 during cooperative reproduction, so that the sense of localization of the sound image with respect to the image (the sense of unity between the image and the reproduced sound) obtained by the user 1 is disturbed. never In addition, the sound is reproduced from the

side tweeter units

123 and 124 and the

rear tweeter units

126A and 126B of the sound reproduction device 100, so that the user 1 can get a sense of spaciousness of the sound. Since the reproduction space generally has walls and a ceiling, the high-frequency sounds reproduced from the

side tweeter units

123 and 124 and the

rear tweeter units

126A and 126B are reflected and reach the user 1, thereby allowing the user 1 to hear the sound. A feeling of expanse can be obtained clearly.

Furthermore, as shown in FIG. 16, the

side tweeter units

123 and 124 and the

rear tweeter units

126A and 126B do not reach the position where the user 1 is expected to view the television receiver 200 as much as possible. It is provided so that the sound wave radiation direction is directed to a position (where the sound pressure level of the direct sound that arrives does not affect localization) is below a predetermined level. As a result, it is possible to prevent the sounds reproduced from the

side tweeter units

123 and 124 and the

rear tweeter units

126A and 126B from disturbing the unity of the video and sound reproduced from the television receiver 200 .

Also, by reproducing sound from the woofer unit 111, it is possible to compensate for low frequency components that tend to be lacking in the sound reproduced from the television receiver 200. Moreover, since it is not necessary to use a plurality of sound reproduction devices, the space required for realizing the above-described reproduction space can be reduced. In addition, since it is not necessary to use a plurality of sound reproduction devices, the user 1 is not burdened with excessive burdens regarding setting and arrangement.

<Modification>
An embodiment of the present disclosure has been described above, but the present disclosure is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present disclosure.

In one embodiment, the process of not outputting sound (x in the table of FIG. 15) does not completely reduce the sound to 0, but reproduces it at a sound pressure level below a predetermined level that is slightly audible as sound. good too. For example, by reproducing high-frequency sound at the sound pressure level described above from the

midrange units

112A and 112B and the

front tweeter units

113A and 113B during linked reproduction, the sound pressure level can be adjusted without hindering the sense of unity between video and sound. can be improved.

In one embodiment, the sound wave radiation direction RD1 is described as an example of the second sound wave radiation direction. It may be the sound wave radiation direction. The sound wave radiation direction of the television receiver 200 in this case may be the radiation direction of the sound wave generated by the vibration, and is not necessarily the direction of the speaker unit, but the direction of the user viewing the image, that is, the television receiver 200. may be in a direction (RD6 in FIG. 16) substantially orthogonal to the display unit 203 of .

The shape of the housing of the sound reproduction device according to the above-described embodiment may be a shape other than a quadrangular prism shape (for example, a cylindrical shape), or may be a horizontally long shape. A sound that has undergone surround processing may be reproduced from the sound reproduction device according to one embodiment. Alternatively, the sound reproducing device may have two woofer units, and one of the woofer units may reproduce the low frequency sound of the L channel, and the other woofer unit may reproduce the low frequency sound of the R channel. . Each of the side tweeter unit and the rear tweeter unit may be composed of one speaker unit, or may be composed of three or more speaker units. Further, a speaker unit for reproducing high frequencies may be provided on the upper side of the back surface so that the direction of sound wave radiation is slightly upward.

Also, the items described in each embodiment and modifications can be combined as appropriate. Moreover, the contents of the present disclosure should not be construed as being limited by the effects exemplified herein.

The present disclosure can also adopt the following configurations.
(1)
Having a first speaker unit that reproduces high-frequency sound of a predetermined frequency or higher,
A sound reproducing device, wherein an angle between a first sound wave emitting direction of the first speaker unit and a second sound wave emitting direction of the second speaker unit is 30° or more.
(2)
The first speaker unit includes a third speaker unit and a fourth speaker unit, and a first speaker unit formed by the third sound wave radiation direction and the second sound wave radiation direction of the third speaker unit (1), wherein an angle is smaller than a second angle formed by the fourth sound wave radiation direction of the fourth speaker unit and the second sound wave radiation direction.
(3)
(2), wherein the directivity of the third speaker unit is narrower than the directivity of the fourth speaker unit.
(4)
The sound reproduction device according to (2) or (3), wherein each of the third speaker unit and the fourth speaker unit includes a pair of speaker units that emit sound waves in different directions.
(5)
The sound reproduction device according to any one of (1) to (4), including the second speaker unit.
(6)
The sound reproduction device according to (5), wherein the second speaker unit is a speaker unit for reproducing low frequencies.
(7)
A front portion, a first side portion extending in a direction substantially orthogonal to the front portion, a second side portion opposite to the first side portion, a back portion opposite to the front portion, and a bottom surface. and a columnar shape including an upper surface,
The second speaker unit is provided on the front portion,
the third speaker unit is provided on at least one of the first side portion and the second side portion;
The sound reproduction device according to any one of (2) to (4), wherein the fourth speaker unit is provided on at least one of the top surface portion and the back surface portion.
(8)
The second speaker unit is provided in a video playback device arranged adjacent to the audio playback device,
The sound reproduction device according to any one of (1) to (7), wherein the second sound wave radiation direction is a direction substantially orthogonal to the display section of the image reproduction device.
(9)
The sound reproducing device according to any one of (1) to (8), wherein the first speaker unit reproduces high-frequency sound of the predetermined frequency or higher in the sound reproduced from the video reproducing device.
(10)
The sound reproduction device according to any one of (1) to (9), wherein the high-frequency sounds of the predetermined frequency or higher include sounds of 5 kHz or higher.
(11)
(10), wherein a signal passed through a high-pass filter with a cutoff frequency of 5 kHz is reproduced from the first speaker unit.
(12)
High-frequency sound of a predetermined frequency or higher in the sound reproduced from the video reproduction device is reproduced by the video reproduction device from a speaker unit having a sound wave emission direction that forms an angle of 30° or more with the sound wave emission direction of the video reproduction device. A sound reproduction method that reproduces sound synchronously with the reproduction of sound.

DESCRIPTION OF SYMBOLS 100... Sound reproduction apparatus 101... Case 102...

Front part

103, 104... Side part 105... Back part 106... Top part 107... Bottom part 111...

Woofer Units

123, 124...

Side tweeter units

126A, 126B... Rear tweeter unit 156... Second HPF
200... Television receiver 203... Display unit

Claims

Having a first speaker unit that reproduces high-frequency sound of a predetermined frequency or higher,
A sound reproducing device, wherein an angle between a first sound wave emitting direction of the first speaker unit and a second sound wave emitting direction of the second speaker unit is 30° or more.
the first speaker unit includes a third speaker unit and a fourth speaker unit;
A first angle formed by the third sound wave emitting direction of the third speaker unit and the second sound wave emitting direction is the fourth sound wave emitting direction of the fourth speaker unit and the second sound wave emitting direction. 2. The sound reproduction device of claim 1, which is smaller than a second angle between the direction and the direction.
The sound reproduction device according to claim 2, wherein the directivity of the third speaker unit is narrower than the directivity of the fourth speaker unit.
3. The sound reproduction device according to claim 2, wherein each of said third speaker unit and said fourth speaker unit has a pair of speaker units that emit sound waves in different directions.
The sound reproduction device according to claim 1, comprising the second speaker unit.
The sound reproducing device according to claim 5, wherein the second speaker unit is a speaker unit for reproducing low frequencies.
A front portion, a first side portion extending in a direction substantially orthogonal to the front portion, a second side portion opposite to the first side portion, a back portion opposite to the front portion, and a bottom surface. and a columnar shape including an upper surface,
The second speaker unit is provided on the front portion,
the third speaker unit is provided on at least one of the first side portion and the second side portion;
The sound reproduction device according to claim 2, wherein the fourth speaker unit is provided on at least one of the top surface portion and the back surface portion.
The second speaker unit is provided in a video playback device arranged adjacent to the audio playback device,
2. The sound reproduction device according to claim 1, wherein the second sound wave radiation direction is a direction substantially perpendicular to the display section of the image reproduction device.
2. The sound reproducing device according to claim 1, wherein the first speaker unit reproduces high-frequency sound of the predetermined frequency or higher in the sound reproduced from the video reproducing device.
2. The sound reproduction device according to claim 1, wherein the high-frequency sounds of the predetermined frequency or higher include sounds of 5 kHz or higher.
11. The sound reproduction device according to claim 10, wherein a signal passed through a high-pass filter with a cutoff frequency of 5 kHz is reproduced from the first speaker unit.
High-frequency sound of a predetermined frequency or higher in the sound reproduced from the video reproduction device is reproduced by the video reproduction device from a speaker unit having a sound wave emission direction that forms an angle of 30° or more with the sound wave emission direction of the video reproduction device. A sound reproduction method that reproduces sound synchronously with the reproduction of sound.