JP2007295634A - Sound output system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more appropriately adjust characteristics of sounds to be heard by a listener. <P>SOLUTION: A speaker system 5 includes a main speaker unit 6 and a sub speaker unit 7 of which directions of sound axes are different from each other. A signal processing apparatus 1 comprises a unit 2 for main speaker which supplies an audio signal inputted to an input terminal 11 to the main speaker unit 6, and a unit 3 for sub speaker which comprises an adjustment means 32 for adjusting the characteristics of the audio signal inputted to the input terminal 11 and supplies the audio signal adjusted by the adjustment means 32 to the sub speaker unit 7. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique for outputting sound in accordance with a signal representing sound (hereinafter referred to as “audio signal”).

Various configurations have been conventionally proposed as a system for outputting sound according to an audio signal (Patent Document 1). For example, the sound output system shown in FIG. 9 includes a signal processing device 91 and a speaker device 92. Of these, the signal processing device 91 includes means for adjusting the characteristics of the audio signal, such as an equalizer that increases or decreases the sound pressure level for each frequency component included in the audio signal, and a power amplifier that amplifies the audio signal. Yes. On the other hand, the speaker device 92 includes three speaker units 921 called a tweeter, a squawker, and a woofer. The audio signal output from the signal processing device 91 is divided into three frequency components having different bands by the network 922 and supplied to the three speaker units 921 respectively.
Japanese Patent Laid-Open No. 5-130689 (paragraph 0021 and FIG. 1)

  By the way, the sound emitted from the speaker device 92 and heard by the listener is a sound (hereinafter referred to as “direct sound”) that directly reaches the listener from the speaker device 92 (that is, without being reflected on the wall surface of the listening room). ) And sound that is emitted from the speaker device 92 and reaches the listener after passing through reflection on the wall surface (hereinafter referred to as “indirect sound”). Then, under the conventional configuration shown in FIG. 9, since the characteristics of the audio signal are adjusted by the signal processing device 91 collectively, the direct sound and the indirect sound are adjusted together. Become. However, under this configuration, there is a problem that the characteristics of the sound output from the speaker device 92 cannot always be adjusted appropriately. This problem will be described below with a specific example.

  FIG. 10A is a graph showing the frequency characteristics of the sound output from the speaker device 92 shown in FIG. 9 and heard by the listener. In this figure, the frequency characteristics of direct sound (hereinafter referred to as “on-axis characteristics”) SPL1 and the frequency characteristics (hereinafter referred to as “steady state transmission characteristics”) SPL0 when the direct and indirect sounds are summed are shown. (The same applies to the graphs shown below). In general, the direct sound has a significant effect on the timbre and sound image perceived by the listener, so the on-axis characteristic SPL1 as the direct sound characteristic is substantially uniform over a wide frequency band as shown in FIG. It is desirable. At this time, paying attention to the steady state transmission characteristic SPL0, a portion where the sound pressure level is lower than other bands (hereinafter referred to as “dip”) in the vicinity of the crossover frequency corresponding to the boundary of the frequency band assigned to each speaker unit 921. D may appear. Here, if the frequency component corresponding to the dip D in the audio signal is increased using the equalizer of the signal processing device 91 or the like, the steady state transmission characteristic SPL0 is made substantially uniform as shown in FIG. Is also possible. However, when such adjustment is performed, the on-axis characteristic SPL1 is also affected. That is, as shown in FIG. 10B, a portion (hereinafter referred to as “peak”) P having a higher sound pressure level than the other bands appears in the vicinity of the crossover frequency in the on-axis characteristic SPL1. The direct sound having such characteristics is annoying for the listener.

  On the other hand, FIG. 11A is a graph showing on-axis characteristics SPL1 and steady-state transmission characteristics SPL0 when the distance from the speaker device 92 to the listener is large. In this figure, as in FIG. 10A, it is assumed that the audio signal is adjusted so that the on-axis characteristic SPL1 is substantially uniform over a wide frequency band. Here, especially when the distance from the speaker device 92 to the listener is large, the high frequency component of the indirect sound is difficult to reach the listener. For this reason, as shown in FIG. 11 (a), when attention is paid to the steady-state transmission characteristic SPL0, the sound pressure level becomes lower in the higher frequency band. On the other hand, when the sound pressure level of the component having a high frequency in the audio signal is increased by the equalizer of the signal processing device 91 in order to eliminate the nonuniformity of the sound pressure level, as shown in FIG. In the characteristic SPL1, the sound pressure level of the high frequency component becomes larger than that in other bands. In this way, the direct sound with non-uniform sound pressure levels becomes annoying to the listener as in the case shown in FIG.

  As illustrated above, both the on-axis characteristic SPL1 and the steady-state transmission characteristic SPL0 are adjusted to the desired characteristics because the direct sound and the indirect sound are adjusted to interlock with each other under the conventional technology. The problem of not being able to do so can arise.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a sound output system that can more appropriately adjust the characteristics of sound heard by a listener.

  In order to solve the above-described problems, the present invention provides a first sound emitting means that is arranged so that a sound axis faces a listener and emits a supplied audio signal; and a sound of the first sound emitting means. A second sound emitting means for emitting the supplied audio signal, an input means for inputting the audio signal, and a sound of the audio signal input to the input means. A first adjusting means for adjusting the pressure level to be supplied to the first sound emitting means; and a sound pressure level of an audio signal inputted to the input means to adjust the pressure level to the second sound emitting means. A second adjusting unit for supplying the first adjusting unit and the second adjusting unit, wherein the relationship between the sound pressure levels of the first adjusting unit and the second adjusting unit depends on the content of the audio signal input to the input unit. A sound characterized by adjusting the sound pressure level so that To provide a power system.

  Moreover, in another preferable aspect, the audio signal input from the input means is an audio signal indicating music, and the first adjusting means and the second adjusting means have both sound pressure levels. The sound pressure level may be adjusted so that the relationship corresponds to the tone of the music indicated by the audio signal input to the input means.

  In another preferred embodiment, the first adjustment means and the second adjustment means have a relationship in sound pressure level between the first sound emission means and the listener. The sound pressure level may be adjusted so as to satisfy the relationship.

  In another preferred embodiment, the second adjustment unit adjusts a sound pressure level for each component belonging to a specific frequency band in the audio signal input from the input unit, and the first sound emission unit. The sound pressure level of the component belonging to the high frequency band side may be adjusted to increase as the distance between the listener and the listener increases.

  In another preferred embodiment, the second adjusting means causes the steady state transmission characteristic to be uniform in a predetermined frequency band by sound emission of the first sound emission means and the second sound emission means. In addition, the sound pressure level may be adjusted for each component belonging to a specific frequency band.

  According to the present invention, the characteristics of the sound emitted from the second sound emitting means under a configuration in which the sound axis of the second sound emitting means is directed in a direction different from the sound axis of the first sound emitting means. Are adjusted independently of the characteristics of the sound emitted from the first sound emitting means. Therefore, for example, in a configuration in which the listener listens to the sound emitted from the first sound emitting means as a direct sound while the listener listens to the sound emitted from the second sound emitting means as an indirect sound. Indirect sound characteristics can be adjusted without affecting the direct sound characteristics. More specifically, the power response can be arbitrarily adjusted without affecting the on-axis characteristic SPL1. This power response is a frequency characteristic when the energy released in all directions of the sound output system as a result of sound generation by the first and second sound emitting means is summed. Since the steady state transmission characteristic SPL0 changes according to the power response, it can be said that according to the present invention, the steady state transmission characteristic SPL0 can be adjusted without affecting the on-axis characteristic SPL1.

  The “sound axis” in the present specification means an axis extending in the front direction of the speaker. For example, when a cone-type speaker unit is used as the sound emitting means, the central axis of the cone (substantially cone) corresponds to the sound axis, and when a horn-type speaker unit is used, The center axis corresponds to the sound axis, and when a dome-type speaker unit is used, the center axis of the dome corresponds to the sound axis. In other words, in a speaker unit configured to emit sound by vibration of a conductor arranged in a magnetic field, it can be said that the central axis of the substantially cylindrical voice coil corresponds to the sound axis.

  The adjustment means may be configured to adjust the characteristics of the audio signal in accordance with an instruction given by a user (for example, a listener), or automatically adjust the characteristics of the audio signal based on a predetermined algorithm. It is good also as a structure to adjust. Of these, in the latter configuration, it is conceivable to adjust the characteristics of the audio signal so that the sound pressure level of both the direct sound and the indirect sound heard by the listener is uniform over a wide frequency band.

  As described above, according to the present invention, the characteristics of the sound heard by the listener can be adjusted more appropriately.

  Embodiments of the present invention will be described below with reference to the drawings.

<A: Configuration of sound output system>
FIG. 1 is a block diagram showing a configuration of a sound output system according to an embodiment of the present invention. As shown in the figure, this system includes a signal processing device 1 and a speaker device 5. Among these, the signal processing device 1 is means for supplying an audio signal supplied from a host device (not shown) to the speaker device 5. As the host device, for example, an optical disk playback device that outputs an audio signal based on data read from various recording media such as an optical disk and a magnetic disk, and an audio signal based on data conforming to the MIDI (Musical Instrument Digital Interface) standard. A sound source device that generates and outputs a signal, or a microphone that is a means for collecting an ambient sound and outputting an audio signal may be employed. On the other hand, the speaker device 5 is a means for outputting a sound corresponding to the audio signal supplied from the signal processing device 1, and is disposed on the floor surface of the listening room 200. The listener R in the listening room listens to the sound output from the speaker device 5.

  The speaker device 5 includes a main speaker unit (first sound emitting means) 6, a sub speaker unit (second sound emitting means) 7, and a cabinet (housing) 51 that houses these speaker units. . As the main speaker unit 6 and the sub speaker unit 7, conventionally known speaker units such as a cone type speaker, a horn type speaker, and a dome type speaker can be adopted. In short, any configuration is possible as long as it is a means capable of outputting a sound corresponding to an audio signal.

  Here, FIG. 2 is a diagram showing the configuration of the speaker device 5 with particular attention to the direction of the sound axis. 2A is a diagram of the speaker device 5 viewed from the side, and FIG. 2B is a diagram of the speaker device 5 viewed from the top. As shown in the figure, the main speaker unit 6 is arranged in the cabinet 51 so that the sound axis 6a faces the listener R (that is, the listener R is positioned on the sound axis 6a). Therefore, at least a part of the sound emitted from the main speaker unit 6 is heard by the listener R as a direct sound without being reflected on the wall surface of the listening room 200, as shown in FIG. On the other hand, the sub-speaker unit 7 is disposed in the cabinet 51 so that the sound axis 7 a faces a direction different from the sound axis 6 a of the main speaker unit 6. More specifically, the sound axis 7a of the sub speaker unit 7 is opposite to the sound axis 6a of the main speaker unit 6 when the speaker device 5 is viewed from above in the vertical direction as shown in FIG. Further, as shown in FIG. 2A, the speaker device 5 is directed upward from the sound axis 6a of the main speaker unit 6 when viewed from the horizontal direction. Therefore, as shown in FIG. 1, the sound emitted from the sub-speaker unit 7 is heard by the listener R as an indirect sound after being reflected once or a plurality of times on the wall surface of the listening room. In other words, it can be said that the direction of the sound axis 7a of the sub speaker unit 7 is determined such that the sound output from the sub speaker unit 7 is heard by the listener R as an indirect sound.

  On the other hand, the signal processing device 1 shown in FIG. 1 includes a main speaker unit 2 and a sub speaker unit 3. The main speaker unit 2 is a means for supplying the main speaker unit 6 with an audio signal input from the host device to the input terminal 11, and has a transmission line 21 extending from the input terminal 11 to the main speaker unit 6. On the other hand, the sub-speaker unit 3 is a means for supplying the audio signal input to the input end 11 to the sub-speaker unit 7. The sub-speaker unit 3 branches from the transmission line 21 of the main speaker unit 6 to the sub-speaker unit 7. A transmission line 31 leading to the transmission line 31.

  The sub-speaker unit 3 has adjusting means 32 for adjusting the characteristics of the audio signal to be supplied to the sub-speaker unit 7. This adjusting means 32 is a volume 321 for adjusting the sound pressure level of the audio signal, an equalizer 322 for adjusting the sound pressure level for each component belonging to a specific frequency band of the audio signal, and amplifies the audio signal. And a power amplifier 323 that outputs to the sub speaker unit 7. On the other hand, the main speaker unit 2 similarly includes a volume 221, an equalizer 222, and a power amplifier 223 as adjusting means 22 for adjusting the characteristics of the audio signal to be supplied to the main speaker unit 6.

  Further, the signal processing device 1 includes an input device (not shown) including various operators such as a knob and a button. The content of adjustment performed on the audio signal by the adjusting means 22 and 32 is determined according to the content of the operation performed on the input device by the user.

  With this configuration, the audio signal that is input from the input end 11 and reaches the transmission line 21 is output as sound from the main speaker unit 6 after the characteristics are adjusted by the adjusting means 22. The sound output from the main speaker unit 6 is heard as a direct sound by the listener R. On the other hand, the audio signal input from the input terminal 11 reaches the adjustment unit 32 via the transmission line 31 branched from the transmission line 21 and is output as sound from the sub speaker unit 7 after adjustment by the adjustment unit. The sound output from the sub speaker unit 7 is heard as an indirect sound by the listener R.

  Thus, in the present embodiment, the characteristics of the audio signal supplied to the sub speaker unit 7 that outputs indirect sound are adjusted independently of the audio signal supplied to the main speaker unit 6. ing. Therefore, the characteristics of the indirect sound from the sub speaker unit 7 to the listener R can be adjusted without affecting the characteristics of the direct sound from the main speaker unit 6 to the listener R. In other words, the power response can be arbitrarily adjusted without affecting the on-axis characteristic SPL1. This power response is a frequency characteristic when the energy released in all directions of the speaker device 5 in accordance with sound generation by the speaker device 5 is summed. The steady state transmission characteristic SPL0, which is a frequency characteristic when the direct sound and the indirect sound are summed, is affected by the power response. Therefore, according to the present embodiment, the steady state transmission characteristic SPL0 can be uniformly adjusted over a wide frequency band without affecting the on-axis characteristic SPL1. This effect will be described in detail as follows.

  For example, when the on-axis characteristic SPL1 and the steady state transmission characteristic SPL0 of the sound output from the speaker device 5 and heard by the listener R are in the state shown in FIG. 3A (for example, the speaker in a narrow acoustic space Assume that the distance between the device 5 and the listener R is small. That is, the on-axis characteristic SPL1 is uniform over a wide frequency band, while the steady-state transmission characteristic SPL0 is when the dip D appears in specific bands B1 and B2. In this case, if the equalizer 322 of the sub-speaker unit 3 appropriately raises the sound pressure level of the frequency components belonging to the bands B1 and B2 in the audio signal to be supplied to the sub-speaker unit 7, FIG. As shown in FIG. 3, a substantially uniform steady state transmission characteristic SPL0 can be obtained over a wide frequency band. At this time, since there is no influence on the direct sound output from the main speaker unit 6, both the on-axis characteristic SPL1 and the steady state transmission characteristic SPL0 are uniform over a wide frequency band as shown in FIG. It becomes.

  Here, when rhythmic music such as rock or pop is played, the direct sound is an important factor that determines the impression of the sound perceived by the listener R. On the other hand, when music played by an organ, classical music, or the like is played, indirect sound is an important factor that determines the impression of sound perceived by the listener R. According to the present embodiment, since both the on-axis characteristic SPL1 related to the direct sound and the steady state transmission characteristic SPL0 related to the indirect sound can be made uniform over a wide frequency band, the tunes such as rhythmic music and classical music are different. Even if the music is played, there is no problem that the balance of the timbre perceived by the listener R is different. Further, by improving the connection between sounds output from a plurality of speaker units each assigned with a different frequency band (that is, by eliminating the dip D in the vicinity of the crossover frequency), there is a natural and realistic feeling. The sound can be played in high fidelity.

  FIG. 4A is a diagram showing on-axis characteristics SPL1 and steady-state transmission characteristics SPL0 when the distance between the speaker device 5 and the listener R is large (for example, a wide acoustic space such as a church or a lecture hall). As shown in the figure, the on-axis characteristic SPL1 is uniform over a wide frequency band, while the steady-state transmission characteristic SPL0 has a lower sound pressure level in a higher frequency region. This is because the high frequency component of the indirect sound tends to be attenuated along with the absorption by air in the long route until reaching the listener R. In such a case, if the sound pressure level of the frequency component belonging to the band B3 in the audio signal to be supplied to the sub speaker unit 7 is appropriately increased by the equalizer 322 of the sub speaker unit 3, FIG. As shown in (b), a substantially uniform steady state transmission characteristic SPL0 can be obtained over a wide frequency band. On the other hand, even if the steady-state transmission characteristic SPL0 is adjusted in this way, there is no influence on the characteristic of the direct sound output from the main speaker unit 6. Therefore, as shown in FIG. The upper characteristic SPL1 also maintains a uniform characteristic over a wide frequency band.

  Here, when the distance between the speaker device 5 and the listener R is large in a wide acoustic space or the like, the characteristics of the wavefront (first wavefront) of the sound emitted from the speaker device 5 and first reaching the listener R, That is, the characteristic of the direct sound is an important factor that determines the impression of the sound perceived by the listener R. This is because, in a wide acoustic space, it takes a long time for the indirect sound to reach the listener R after the direct sound reaches the listener R, compared to a narrow acoustic space. Therefore, when the uniformity of the on-axis characteristic SPL1 is impaired in accordance with the adjustment of the steady state transmission characteristic SPL0 as shown in FIG. A particularly unnatural impression is given to the sound emitted from the device 5. On the other hand, according to the present embodiment, the steady state transmission characteristic SPL0 is adjusted independently of the on-axis characteristic SPL1, so that a sound with rich reverberation can be obtained by uniformly adjusting the steady state transmission characteristic SPL0. On the other hand, the impression of the sound by the listener R is not changed with this adjustment. In other words, when the speaker device 5 according to the present embodiment is installed in a wide acoustic space, it is possible to improve the influence of the sound emitted from the speaker device 5 on the audibility in the time domain.

  In the present embodiment, the direct sound from the main speaker unit 6 to the listener R and the sub speaker unit are adjusted by independently adjusting the volume 221 of the main speaker unit 2 and the volume 321 of the sub speaker unit 3. The balance of the sound pressure level with the indirect sound from 7 to the listener R can be arbitrarily changed. Therefore, according to this embodiment, the reverberation of the sound perceived by the listener R can be changed as appropriate. For example, if the volume 321 of the sub-speaker unit 3 is adjusted, the sound pressure level of indirect sound (that is, reverberation sound) from the sub-speaker unit 7 through the reflection on the wall surface to the listener R increases. The perceived reverberation can be increased. On the contrary, in order to reduce the reverberation feeling, the sound pressure level of the indirect sound from the sub speaker unit 7 to the listener R can be lowered by adjusting the volume 321 of the sub speaker unit 3. In general, the characteristics of the indirect sound heard as reverberation sound by the listener R depend on various conditions such as the sound absorption characteristics of the wall surface in the listening room 200, the volume of the listening room, or the distance from the speaker device 5 to the listener R. Although influenced, this condition can be appropriately corrected by arbitrarily adjusting the balance between the direct sound and the indirect sound in the present embodiment.

<B: Modification>
The embodiment described above is merely an example. Therefore, various modifications can be made to this embodiment without departing from the spirit of the present invention. Specifically, the following modifications can be considered.

<B-1: Modification 1>
You may change the structure of the adjustment means 22 and 32 shown in the said embodiment, or the main speaker unit 6 and the sub speaker unit 7 as follows.

(1) First Mode In the above embodiment, the configuration in which the volume 221 and the equalizer 222 are included in the main speaker unit 2 for supplying an audio signal to the main speaker unit 6 is exemplified. According to this configuration, even when a dip or a peak appears in the on-axis characteristic SPL1, the on-axis characteristic SPL1 is made uniform over a wide frequency band by appropriately operating the volume 221 or the equalizer 222. Can be adjusted. However, when the configuration of the main speaker unit 6 is designed in advance so that the on-axis characteristic SPL1 is flat over a wide frequency band, as shown in FIG. 5, the volume 221 and the equalizer 222 shown in FIG. Can be omitted.

(2) Second Mode In the above embodiment, the signal processing device 1 includes the equalizers 222 and 322. However, if only the sound pressure level balance between the direct sound and the indirect sound is adjusted. The equalizers 222 and 322 may be omitted as shown in FIG. In the configuration shown in FIG. 6, a passive network 75 is provided in front of the sub speaker unit 7. The passive network 75 functions as a filter that selectively outputs only components belonging to a specific frequency band in the audio signal. According to this configuration, even if the equalizer 322 is omitted, the sound pressure level of the component belonging to the pass band of the passive network 75 in the indirect sound can be increased, so that the steady state transmission characteristic SPL0 is corrected. be able to.

(3) Third Aspect In the above embodiment, the case where there is one speaker unit (main speaker unit 6) whose sound axis is directed to the listener R is exemplified, but a plurality of speaker units may be provided. That is, as shown in FIG. 7, instead of the main speaker unit 6 shown in FIG. 1, a passive network 65, a first main speaker unit 61, and a second main speaker unit 62 may be provided. Of these, the passive network 65 is means for dividing the audio signal supplied from the main speaker unit 2 into two frequency components having different bands. Of these two frequency components, the audio signal on the low frequency side is supplied to the first main speaker unit 61, while the audio signal on the high frequency side is supplied to the second main speaker unit 62. According to this configuration, the first main speaker unit 61 can function as a woofer, and the second main speaker unit 62 can function as a tweeter. Although the case where the number of main speaker units is two is illustrated here, it is needless to say that three or more main speaker units may be used. In this case, the passive network 65 divides the audio signal into the same number of frequency components as the main speaker unit or fewer.

(4) Fourth Mode A means for delaying the audio signal may be included in the adjusting means 32 of the sub-speaker unit 3. FIG. 8 is a block diagram showing the configuration of the sound output system according to this aspect. In FIG. 8, it is assumed that two main speaker units 61 and 62 and a passive network 65 are provided, as in the configuration shown in FIG.

  As shown in FIG. 8A, in this aspect, a delay unit 325 is provided between the equalizer 322 and the power amplifier 323 in the adjustment unit 32 of the sub-speaker unit 3. The delay means 325 is a means for delaying the audio signal output from the equalizer 322 and outputting it to the power amplifier 323. Specifically, an FIR filter or other delay element can be employed as the delay means 325. The delay time by the delay means 325 can be appropriately changed by the user operating the input device.

  On the other hand, FIG.8 (b) is a figure when the speaker apparatus 5 shown to Fig.8 (a) is seen from the front. As shown in FIGS. 8A and 8B, in this embodiment, instead of the sub speaker unit 7 shown in FIG. 1, a first sub speaker unit 71, a second sub speaker unit 72, and a third sub speaker unit 7 are used. There are provided three speaker units called sub-speaker unit 73. Of these, the first sub-speaker unit 71 is arranged such that the sound axis 7a is directed upward in the vertical direction. As shown in FIG. 8B, the second sub-speaker unit 72 is arranged such that the sound axis 7a faces rightward in the horizontal direction when the speaker device 5 is viewed from the front. On the other hand, the third sub-speaker unit 7 is arranged so that the sound axis 7a is leftward in the horizontal direction when the speaker device 5 is viewed from the front. That is, when the speaker device 5 is arranged so that each surface of the substantially rectangular parallelepiped cabinet 51 is parallel to each wall surface of the listening room 200 that is a substantially rectangular space, the first to third sub speaker units 71 are arranged. The directions of the sub-speaker units 71 to 73 are determined so that the sound axes 7 a to 73 are perpendicular to the wall surfaces of the listening room 200. On the other hand, the transmission line 33 from which the audio signal is output from the power amplifier 323 of the sub-speaker unit 3 is branched into three, and the three transmission lines 331 are connected to the first to third sub-speaker units 71 to 73, respectively. Each is connected. Further, in place of the volume 321 shown in FIG. 1, a volume 326 is provided in each of the three transmission lines 331 after branching, and the sound pressure level of the audio signal supplied to each of the sub-speaker units 71 to 73 is provided. Are adjusted individually. Note that the number of sub-speaker units is not limited to three, and may be any other number.

  According to this configuration, the sound heard by the listener R can be brought close to the sound heard in various acoustic spaces having different shapes and sizes. For example, if the delay time by the delay means 325 is adjusted to a long time, the sound output by the main speaker units 61 and 62 is heard as a direct sound by the listener R and then output by the sub speaker units 71 to 73. It takes a long time for the listener R to listen to the sound as an indirect sound. Therefore, the listener R in the listening room 200 can experience the same auditory effect as a wide space in which the emitted sound reaches the listener R after a long distance. For example, if the sound pressure level of the sound output from the second sub-speaker unit 72 and the third sub-speaker unit 73 in which the sound axis 7a faces the horizontal direction is increased, the listener R is reached from the horizontal direction. The sound pressure level of indirect sound increases. Therefore, the listener R can experience the feeling of being wrapped around. Thus, according to this aspect, the acoustic effect perceived by the listener R can be appropriately controlled.

(5) Other aspects The components of the adjusting means 22 and 32 in the signal processing device 1 are not limited to those described above. For example, an attenuator may be included instead of or together with the volumes 221 and 321, and various other filters may be included. Moreover, as a matter of course, the configuration shown in FIG. 1 as the embodiment or the configurations shown in FIGS. 5 to 8 as the first to fourth aspects may be appropriately combined.

<B-2: Modification 2>
In the said embodiment and modification, although the content of the adjustment by the adjustment means 22 and 32 illustrated the structure determined according to operation by the listener R, the content of the adjustment determined based on other conditions May be adopted. For example, the contents of adjustment by the equalizer 322 shown in FIG. 1 (for example, the frequency band in which the sound pressure level should be adjusted and the adjustment amount of the sound pressure level) are set so that the steady state transmission characteristic SPL0 is uniform over a wide frequency band. That is, you may determine so that the sound pressure level of the direct sound and indirect sound heard by the listener R may become substantially uniform.

<B-3: Modification 3>
In the above embodiment and the modification, the signal processing device 1 and the speaker device 5 are illustrated as separate devices. However, each part of the signal processing device 1 is accommodated in the cabinet 51 of the speaker device 5 and integrated. It is good also as an apparatus. In addition, some of the components of the signal processing device 1 shown in the embodiment and the modification may be accommodated in the speaker device 5, or some of the components of the speaker device 5 may be accommodated in the signal processing device 1. May be.

It is a block diagram which shows the structure of the sound output system which concerns on embodiment of this invention. It is a figure which shows the structure of the speaker apparatus in a sound output system. It is a figure for demonstrating the effect of this embodiment. It is a figure for demonstrating the effect of this embodiment. It is a block diagram which shows the structure of the sound output system which concerns on the modification of the embodiment. It is a block diagram which shows the structure of the sound output system which concerns on the modification of the embodiment. It is a block diagram which shows the structure of the sound output system which concerns on the modification of the embodiment. It is a block diagram which shows the structure of the sound output system which concerns on the modification of the embodiment. It is a block diagram which shows the structure of the conventional sound output system. It is a figure for demonstrating the problem in the prior art. It is a figure for demonstrating the problem in the prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Signal processing device, 11 ... Input end, 2 ... Main speaker unit, 22, 32 ... Adjustment means, 221, 321, 326 ... Volume, 222, 322 ... Equalizer, 223, 323 ... Power amplifier, 3 ... sub-speaker unit, 325 ... delay means, 5 ... speaker device, 51 ... cabinet, 6, 61, 62 ... main speaker unit, 6a, 7a ... sound axis, 7,71 , 72, 73... Sub-speaker unit, 200... Listening room, R.

Claims (5)

First sound emitting means arranged so that the sound axis faces the listener and emitting the supplied audio signal;
A second sound emitting means having a sound axis in a direction different from the sound axis of the first sound emitting means and emitting a supplied audio signal;
An input means for inputting an audio signal;
First adjusting means for adjusting a sound pressure level of an audio signal input to the input means and supplying the sound pressure level to the first sound emitting means;
Adjusting the sound pressure level of the audio signal input to the input means, and supplying the second sound output means to the second sound output means; and
The first adjustment means and the second adjustment means adjust the sound pressure level so that the relationship between the sound pressure levels of both is in accordance with the content of the audio signal input to the input means. A sound output system characterized by The audio signal input from the input means is an audio signal indicating music,
The first adjusting means and the second adjusting means are arranged so that the relationship between the sound pressure levels of both is in accordance with the tone of the music indicated by the audio signal input to the input means. The sound output system according to claim 1, wherein a level is adjusted. The first adjusting means and the second adjusting means are such that the relationship between the sound pressure levels of both is further in accordance with the distance between the first sound emitting means and the listener. The sound output system according to claim 1, wherein the sound pressure level is adjusted. The second adjusting means adjusts the sound pressure level for each component belonging to a specific frequency band in the audio signal input from the input means, and the distance between the first sound emitting means and the listener is large. The sound output system according to any one of claims 1 to 3, wherein the sound pressure level of the component belonging to the high frequency band side is adjusted so as to increase. The second adjusting means belongs to a specific frequency band so that steady state transmission characteristics are uniform in a predetermined frequency band by sound emission of the first sound emitting means and the second sound emitting means. The sound output system according to claim 4, wherein the sound pressure level is adjusted for each component.

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