JP2013138307A - Sound field controller and sound field control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control sound field with high accuracy by a simple configuration.SOLUTION: A sound field controller 40a controls the sound field at a listening point by supplying the audio signals of a plurality of channels, respectively, to speakers 51-55 while performing signal processing. The sound field controller 40a includes a location information storage unit 42 for storing the location information of the speakers 51-55 measured by a terminal 10, and the location information corresponding to the listening point, respectively, and a sound field setting unit 43 for setting the content of signal processing on the basis of each location information thus stored.

Description

  The present invention relates to a technique for controlling a sound field using position information of speakers and listeners measured by a terminal device.

In an audio system having a plurality of speakers, if the distance from each speaker to the listening point is different from each other, the volume and phase will be different when the sound generated from each speaker is heard at the listening point.
In view of this, a technique has been proposed in which a test sound or the like generated from a speaker is detected at a listening point to obtain a sound pressure difference or a phase difference, and the volume and phase of a signal supplied to each speaker is controlled (for example, Patent Document 1) 2). As for position measurement, if there is a technique using a wireless system (for example, see Patent Document 3), a technique for reflecting a radio wave emitted from a speaker by a listener and receiving the reflected wave by a receiver provided in the speaker (for example, (See Patent Document 4). In addition, a technique for measuring a distance to a speaker using a camera focus function provided at a listening point (see, for example, Patent Document 5) has also been proposed.

Japanese Patent Laid-Open No. 11-331999 JP 2003-032799 A JP 2006-229738 A JP 2006-313980 A JP 2007-043320 A

However, each of the above techniques can measure the distance from each speaker to the listening point, but is inferior in accuracy, or requires an additional configuration such as a radio or a camera for position measurement.
The present invention has been made in view of the above-described circumstances, and one of its purposes is to provide a sound field control device and a sound field control method capable of controlling a highly accurate sound field with a simple configuration. There is.

  In order to achieve the above object, a sound field control apparatus according to the present invention performs sound signal processing on a plurality of channels of audio signals and supplies the signals to a plurality of speakers to control the sound field at a listening point. A position information storage unit that stores the position information of the plurality of speakers and the position information corresponding to the listening point measured by the terminal device, and each position stored in the position information storage unit And a sound field setting unit for setting the content of the signal processing based on information. According to the present invention, the position of the speaker and the listening point are measured by the position measurement function (positioning function) of the terminal device. For this reason, since not only the distance from the speaker to the listening point but also the positional relationship between the speaker and the listening point can be specified, the accuracy of the sound field to be formed can be increased. In addition, when acquiring such position information, it is not necessary to generate a test sound unrelated to the audio signal, and if the listener carries the terminal device, the sound field can be controlled almost in real time as the listener moves. Is also possible. The present invention can be conceptualized not only as a sound field control device but also as a sound field control method.

  In the present invention, the position information storage unit stores position information that specifies a shape of a space including the listening point, and the sound field setting unit determines the shape of the space from the position information that specifies the shape of the space. And the content of the signal processing may be set according to the estimated space. According to this configuration, the sound field can be formed by reflecting the shape of the room including the listening point.

  Another object of the present invention is to provide a sound field control device that performs signal processing on a plurality of audio signals, supplies the signals to a plurality of speakers arranged in a housing, and controls the sound field at the listening point by direct sound and reflected sound. A position information storage unit that stores position information of the housing, position information corresponding to the listening point, and position information that specifies a shape of a space including the listening point, measured by the terminal device; The present invention can also be achieved by an invention relating to a sound field control device including a sound field setting unit that sets the content of the signal processing based on each position information stored in the position information storage unit. This invention can also be conceptualized as a sound field control method.

It is a figure which shows the structure of the system containing the sound field control apparatus which concerns on 1st Embodiment. It is a figure which shows positional relationships, such as a speaker and a listener. It is a flowchart which shows operation | movement of the sound field control apparatus. It is a figure which shows acquisition of the positional information in the same sound field control apparatus. It is a figure which shows the example of acquisition of the room shape in the same sound field control apparatus. It is a figure which shows the sound field setting in the sound field control apparatus. It is a figure which shows the structure of the sound field control apparatus which concerns on 2nd Embodiment. It is a figure which shows the structure of the system containing the same sound field control apparatus. It is a figure which shows the positional relationship of a speaker, a listener, etc. It is a figure which shows acquisition of the positional information in the same sound field control apparatus. It is a figure which shows the positional relationship in a sound field control apparatus. It is a figure which shows the positional relationship in a sound field control apparatus. It is a figure which shows the positional relationship in a sound field control apparatus.

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

FIG. 1 is a block diagram showing a schematic configuration of an audio system including a sound field control device 40a according to the first embodiment.
As shown in this figure, the audio system includes a terminal device 10 having a positioning function, a playback unit 20 that generates a playback signal, a monitor 30, a sound field control device 40a that applies a sound field to the playback signal, Speakers 51 to 55 that acoustically convert and output audio signals of the respective channels to which a sound field is applied are included.

  The terminal device 10 is, for example, a mobile phone, and a detailed configuration is omitted. However, the terminal device 10 includes a CPU, a memory, a display device, a touch panel, and the like. Input and various instructions are made. The terminal device 10 has a positioning function for measuring the position of the terminal device 10 by GPS (Global Positioning System) in addition to a communication function for performing short-range wireless communication within a range of, for example, a few tens of meters from the sound field control device 40a. Have. Then, the terminal device 10 displays a screen based on information received from the sound field control device 40a by executing a predetermined program installed in advance, and displays a position to be positioned or a position at which positioning is performed. Information is transmitted to the sound field control device 40a.

In addition, although the positional information measured by the terminal device 10 is longitude and latitude, altitude may be added as described later. Further, as a positioning function, in addition to GPS, D-GPS (Differential GPS) that corrects a GPS measurement error with a reference point whose position information is known may be used. In addition, a method of measuring the phase difference of radio waves received from a plurality of reference points, a method of comparing radio wave intensity and radio wave arrival time by a plurality of reference points, etc. may be used. It may be used. In addition, a method may be used in which the position is specified by the movement direction / distance from a known point using an acceleration sensor, a gyro sensor, or the like.
The terminal device 10 is not limited to a mobile phone, and may be a tablet computer, a PDA (Personal Digital Assistant), a portable navigation device, or the like as long as it has the communication function and the positioning function.

The reproduction unit 20 generates a reproduction signal by reproducing various media such as a CD (compact disk), a DVD (digital versatile disk), and a BD (blu-ray disk) or by receiving broadcast radio waves. To do. In addition to the audio signal, the reproduction signal may include a video signal depending on the reproduction medium.
The monitor 30 is a liquid crystal display device, a plasma display, or the like, and displays a video based on a video signal included in the reproduction signal.

The sound field control device 40a decodes an audio signal included in the reproduction signal into audio signals of a plurality of channels, adds a sound field, and outputs the decoded signal. The communication unit 41, the position information storage unit 42, the sound field A setting unit 43, a sound field applying unit 44, and an amplifying unit 45 are included.
Among these, the communication unit 41 performs short-range wireless communication with the terminal device 10. The location information storage unit 42 acquires and stores location information from the terminal device 10 via the communication unit 41.

The sound field setting unit 43 controls transmission / reception with the terminal device 10, determines the contents of signal processing corresponding to the sound field to be applied, and sets the signal processing content to the sound field applying unit 44. The sound field imparting unit 44 performs signal processing of the contents set by the sound field setting unit 43 on each channel of the audio signal. The sound field setting unit 43 and the sound field applying unit 44 are realized by, for example, a microcomputer having a DSP (Digital Signal Processor) function.
The amplifying unit 45 is an aggregate of amplifiers for each channel, amplifies the audio signal subjected to signal processing for each channel, and outputs the amplified audio signals to the speakers 51 to 55, respectively.
In the figure, a mutual arrow directly connecting the communication unit 41 and the sound field providing unit 44 is also provided, but this is performed by setting the sound field based on the position information on the terminal device 10 side, This is because it is assumed that the sound field parameter is instructed to the field imparting unit 44.

FIG. 2 is a diagram illustrating the positional relationship between the speakers 51 to 55 and the listener L in a state where the listening room 60 in which the speaker is installed is viewed in a plan view.
As shown in this figure, each of the speakers 51 to 55 is sequentially connected to the front left (FL), center (C), front right (FR), surround left (SL) and surround right (SR) channels, respectively. It corresponds. More specifically, a C-channel speaker 52 is installed approximately at the center of the display surface of the monitor 30, as viewed from the listener L, an FL-channel speaker 51 is installed on the left side of the monitor 30, and an FR-channel speaker 53 is installed on the right side. When viewed from the listener L, an SL channel speaker 54 is installed on the left rear side, and an SR channel speaker 55 is installed on the right rear side.
Although the subwoofer is omitted, the time axis and the volume may be adjusted as with other speakers.

Next, the operation of the sound field control process in the sound field control device 40a will be described. FIG. 3 is a flowchart showing the operation of the sound field control process.
This sound field control process is performed when, for example, a predetermined program is started in the terminal device 10 in a state where the power is turned on in the sound field control device 40a, and near field communication is established with the sound field control device 40a. It is executed by the sound field control device 40a.
First, in the sound field control device 40a, the sound field setting unit 43 determines whether or not the position information of the speakers 51 to 55 is stored in the position information storage unit 42 (step Sa11).

  When the position information of the speaker is not stored (when the determination result in step Sa11 is “No”), the sound field setting unit 43 requests the terminal device 10 for the position information of the speakers 51 to 55 via the communication unit 41. Then, the position information as the response is acquired from the terminal device 10 and stored in the position information storage unit 42 (step Sa12). Specifically, for example, the position information of the speakers 51 to 55 is acquired and stored by the sound field control device 40a as follows.

In the terminal device 10, when there is a request for positional information of the speakers 51 to 55 from the sound field control device 40 a, the terminal device 10 is moved to a point where the speakers 51 to 55 are installed with respect to the user (listener L). To display on the display section that a predetermined operation should be performed. In accordance with this display, when the user actually moves the terminal device 10 to a point where any of the speakers 51 to 55 is installed and performs a predetermined operation, for example, when the user touches a software key button for instructing the start of positioning. When the terminal device 10 locates the point and obtains the position information, the terminal device 10 displays the fact on the display unit. This operation is executed for each of the speakers 51 to 55 to obtain position information of each point.
At this time, the order in which the terminal apparatus 10 is moved may be specified. For example, in FIG. 4, the display prompts the user that the order of the points where the terminal device 10 should be moved is a → b → c → d → e, and the user turns the terminal device 10 according to the display. It may be moved to.
Even if the user moves the terminal device 10 at random or in any order, since the arrangement of the speakers 51 to 55 is regular, the first to fifth positioning is performed from the arrangement of the acquired position information (front and rear, left and right). It is also possible to determine which speaker of the speakers 51 to 55 corresponds to the speaker position information.
The terminal device 10 transmits the position information of the speakers 51 to 55 obtained in this way to the sound field control device 40a, while the sound field setting unit 43 transmits the position information of the speakers 51 to 55 via the communication unit 41. Is stored in the position information storage unit 42.
Even when the speaker is moved, the position where the speaker is installed is determined by executing step Sa12.

On the other hand, when the position information of the speaker is already stored (when the determination result of step Sa11 is “Yes”), step Sa12 is skipped.
Next, the sound field setting unit 43 determines whether or not the position information of the point that defines the shape of the listening room 60 is stored in the position information storage unit 42 (step Sa13).

  When the position information of the point that specifies the shape of the listening room 60 is not stored (when the determination result in Step Sa13 is “No”), the sound field setting unit 43 sends the sound to the terminal device 10 via the communication unit 41. The position information of the point specifying the shape of the listening room 60 is requested, the position information as the response is acquired from the terminal device 10 and stored in the position information storage unit 42 (step Sa14). Specifically, for example, position information of a point that specifies the shape of the listening room 60 is acquired and stored by the sound field control device 40a as follows.

  In the terminal device 10, when there is a request for position information of a point whose shape is specified from the sound field control device 40 a, the terminal device 10 is moved to a corner or a vertex point of the listening room 60 to the user, The display unit displays that the operation is to be performed. According to this display, when the user actually moves the terminal device 10 to the point and performs a predetermined operation, the terminal device 10 positions the point and obtains its position information. Display on the display. If the shape of the listening room 60 is, for example, a rectangle in plan view, this operation is executed for each of the four corners of the listening room 60 to position each point. When the positioning is completed, the terminal device 10 transmits the position information of the point specifying the shape of the listening room 60 to the sound field control device 40a, while the sound field setting unit 43 receives the position information received via the communication unit 41. Is stored in the position information storage unit 42.

At this time, the order in which the terminal apparatus 10 is moved may be specified. For example, in FIG. 4, the display prompts the user that the order of points where the terminal apparatus 10 should be moved is f → g → h → i, and the user moves the terminal apparatus 10 in order according to the display. You may let them.
In addition, here, the shape of the listening room 60 has been described as a rectangle as shown in FIG. 5A. However, even if the shape is as shown in FIG. 5B or FIG. What is necessary is just to measure the point of “★” corresponding to the apex.
Even when the listening room is changed by changing the installation room of the audio system or moving, the point where the shape of the listening room 60 is specified is determined by executing step Sa14.
Thus, the shape of the listening room 60 can be estimated as a shape connecting the shortest vertices when the vertices are located at the positions. In other words, if the room has a polygonal shape, the positions of the vertices of the polygon are measured in the order of arrival, and it is input that the positioning has been completed at all the vertices. It can be estimated as a shape.
On the other hand, when the position information of the point specifying the shape of the listening room 60 has already been stored (when the determination result of step Sa13 is “Yes”), step Sa14 is skipped.

  Next, the sound field setting unit 43 requests the terminal device 10 via the communication unit 41 for the position information of the listening point of the listener L carrying the terminal device 10 at the present time, and the position information as a response to the position information Obtained from the terminal device 10 and stored in the position information storage unit 42 (step Sa15). Specifically, for example, the current position information of the terminal device 10 is acquired and stored in the sound field control device 40a as follows.

  In the terminal device 10, when there is a request for the current position information from the sound field control device 40 a, the display unit displays that the terminal device 10 should be moved to the listening point. According to this display, when the user moves the terminal device 10 to the listening point, strictly speaking, the point j corresponding to the center of the head at the time of listening in FIG. 4, the terminal device 10 positions the point. When the positioning is completed, the terminal device 10 transmits the position information of the listening point to the sound field control device 40a, and the sound field setting unit 43 stores the position information received via the communication unit 41 in the position information storage unit 42. Remember.

Subsequently, in the listening room 60 whose shape is estimated by the position information, the sound field setting unit 43 is the listening point specified by the position information when the speakers 51 to 55 are arranged at the points specified by the position information. The processing contents (various parameters and adjustment amounts) of the sound field when the listener L listens are determined and set in the sound field applying unit 44 (step Sa16).
For example, for the phase difference, the sound field setting unit 43 first reads the position information stored in the position information storage unit 42 and calculates the distance between each installation point of the speakers 51 to 55 and the listening point. Secondly, the amount of adjustment of the time axis of the audio signal corresponding to the speakers 51 to 55 is determined in correspondence with these distances. In addition, the sound field setting unit 43 determines the adjustment amount of the reproduction volume by each speaker so that the attenuation amount according to the distance between each speaker and the listening point is offset. Furthermore, the positional relationship between the wall surface and each speaker / listener and the volume of the room are calculated from the room shape estimated in step Sa14, and the frequency characteristics, reverberation characteristics, and phase characteristics due to reflection and shielding of the listening room wall surface are calculated. It is also possible to estimate and determine sound field processing according to this. Specific sound field processing includes the correction of the standing wave frequency band estimated by the wall interval, the correction of the frequency dip caused by the distance between the speaker and the wall, and the reverberation from the room volume calculated from the room shape and dimensions. Processing such as estimating time and correcting reverberation parameters (reverberation amount, reverberation time, etc.) can be considered.
Then, the sound field setting unit 43 sets the determined processing content in the sound field applying unit 44.
Thereby, the reproduction signal from the reproduction unit 20 is output with an appropriate sound field applied to the arrangement of the speakers 51 to 55, the shape of the listening room 60, and the listening point of the listener L.

The sound field setting unit 43 determines whether or not a predetermined period (for example, 30 seconds) has elapsed since the sound field was set (step Sa17). If the predetermined period has not elapsed, the processing procedure is returned to step Sa17 again. On the other hand, when a predetermined period has elapsed since the sound field was set, the sound field setting unit 43 determines whether or not an instruction to turn off the power or end the sound field setting process has been given from the previous time to this time (step Sa18). . If an instruction has been given, the sound field control process ends. On the other hand, if no instruction has been given, the processing procedure returns to step Sa15.
For this reason, unless an instruction to turn off the power is given, steps Sa15 and Sa16 are repeatedly executed at predetermined intervals.

In the present embodiment, the position information of the listening point acquired in step Sa15 may be different from or the same as the position information of the listening point acquired last time.
If they are different, it indicates that the listener L has moved from the previous positioning (when executing step Sa15) to the current positioning. In this case, among the position information stored in the position information storage unit 42, the position information of the listening point is updated to the position information re-positioned this time, and in the next step Sa16, based on the updated position information. Sound field is determined and set. Therefore, for example, in FIG. 4, when the listener L carrying the terminal device 10 moves from the previously-positioned point j to the currently-positioned point ja, as shown in FIG. The position is changed according to the listening point at the point ja after the movement.

  In this embodiment, Steps Sa15 and Sa16 are repeatedly executed every predetermined period unless an instruction to turn off the power is given. Therefore, when the listener L carries the terminal device 10 and moves, the listening point after the movement is determined. After positioning, the sound field is changed according to the position information. At this time, the listener L does not perform any operation on the sound field control device 40a when changing the sound field, and does not need to set a microphone at the listening point to generate a test sound or the like from the speaker. Therefore, according to the present embodiment, when the listening point is changed when playing music or watching a movie, the sound field corresponding to the changed listening point is reset without interrupting playback or watching. Can do.

  When the position information acquired in step Sa15 is the same as the position information acquired last time, the listener L does not move. In this case, since the position information stored in the position information storage unit 42 is not changed, neither the sound field nor the next step Sa16 is changed.

  In the first embodiment, the shape of the listening room 60 may not be acquired. For example, if the phase difference or volume of the direct sound from the speaker to the listener L is adjusted without considering reflection and reverberation by the wall surface when setting the sound field, the positional information for specifying the shape of the listening room 60 is not necessarily required Don't get.

Next, a second embodiment of the present invention will be described.
In the first embodiment, the sound field is provided by a system in which five speakers 51 to 55 are arranged so as to surround the listening point. In the second embodiment, the sound field is controlled by a sound field control device using a speaker array. Is granted.
FIG. 7 is a diagram showing a configuration of a sound field control device 40b using a speaker array, and FIG. 8 is a block diagram showing a configuration of a system including the sound field control device 40b.
As shown in FIG. 8, in the sound field control device 40 b, the communication unit 41, the position information storage unit 42, the sound field setting unit 43, the sound field applying unit 44, the amplification unit 45, and the plurality of speakers 46 are included in the housing. Have Among these, the speaker 46 is arrange | positioned in a line shape in a housing | casing, for example, as FIG. 7 shows. 7 shows an example in which the speakers 46 are arranged in a line, but an example in which the speakers 46 are arranged in a plane with a plurality of lines may be used.

  In the sound field control device 40b, sounds related to the same audio signal are output from a plurality of speakers 46 with slightly different delay times so that they simultaneously reach the focal point in space. Specifically, the sound field applying unit 44 performs the delay processing as described above on each of the audio signals of the FL, C, FR, SL, and SR channels, for example, and then performs the delay processing on each channel. Are added and output. Thereby, since the acoustic energy around the focal point is enhanced by the in-phase addition, a sound beam having a strong directivity in the focal direction is generated for each channel.

  FIG. 9 is a plan view showing an installation state of the sound field control device 40b. As shown in this figure, the sound field control device 40b is arranged so that the arrangement surface of the speakers 46 faces the listener L in a direction substantially parallel to the display surface of the monitor 30, and the sound beam relating to each channel is transmitted. The light is reflected on the wall surface of the listening room 60 and reaches the listener L. For this reason, when viewed from the listener L, it is perceived as if the sound image is localized in the wall surface direction. In detail, as shown in the figure, it is perceived as if the reproduction sound of the FL, FR, SL, and SR channels is generated from the reflection points 461, 463, 464, and 465 on the wall surface. Can produce a great surround effect. Note that the reproduced sound of the C channel is localized almost at the center of the sound field control device 40b.

In such a sound field control device 40b, compared with the first embodiment, it is not necessary to arrange the speakers 51 to 55, but the reflected sound on the wall surface of the listening room 60 is actively used. The positional relationship between the sound field control device 40b and the listening point is important.
For this reason, in 2nd Embodiment, as shown in FIG. 10, the object of the measurement position by the terminal device 10 is set to the listening point j and the points f, g, h, i for specifying the shape of the listening room 60. In addition, a left end point A and a right end point B in the sound field control device 40b are used.
In the second embodiment, a straight line connecting points A and B is used as an array surface of the speakers 46, and a midpoint of the straight line is used as a C channel emission point.

  In the second embodiment, the position information of the speaker in the flowchart of FIG. 3 is read as the position information of the sound field control device 40b. That is, the sound field setting unit 43 is defined by the position information when the sound field control device 40a is arranged at the position and the position defined by the position information in the shape of the listening room 60 estimated by the position information. The processing content of the sound field is determined and set in the sound field applying unit 44 so that the sound beam of each channel is directed to the listening point.

In the second embodiment, the position of the sound field control device 40b and the position of the wall of the listening room 60 and the facing angle are determined from the position information of the speaker and the room position information. It can be calculated in advance whether reflection is obtained.
The example shown also in FIG. 9 is an ideal case where the shape of the listening room 60 and the arrangement of the sound field control device 40b are ideal, but the direction of the sound beam of each channel is the radiation direction that becomes the wall reflection reaching the listener L. Can be calculated geometrically.
However, as shown in conventional beam automatic adjustment using a speaker array and a microphone (see, for example, Japanese Patent Laid-Open No. 2006-013711), beam formation of each channel sound by wall reflection may be difficult. For example, as shown in FIG. 12, since the sound field control device is installed at the corner of the room, the wall reflection of the FL and FR channels cannot be obtained, or from the listener L as shown in FIG. In some cases, the distance between the left and right walls is asymmetric and the sound balance is lost. In the case shown in FIG. 12, the FL and FR channels may be directly radiated to the listener L without wall reflection, and the reflection directions arriving at the listener L may be calculated for the SL and SR channels. In the example shown in FIG. 13, a channel whose balance is lost may be calculated as a beam direction that forms a phantom (virtual) sound source by dividing components into beams of other channels.

The point that the current point is measured as a listening point by the terminal device 10 carried by the listener L and transmitted to the sound field control device 40b is the same as in the first embodiment. For this reason, also in 2nd Embodiment, the sound field according to the listening point of the listener L who carries the terminal device 10 is set appropriately.
By the way, although the mutual arrow which directly connected the communication part 41 and the sound field provision part 44 is also provided, this performs the sound field setting by positional information on the terminal device 10 side, and the sound field provision part 44 via the communication part 41 is provided. It is assumed that the sound field parameters are instructed.

  In the second embodiment, the points A and B are measured in order to grasp the direction of the sound field control device 40b and the position with respect to the listening room 60. Therefore, if these directions and positions can be grasped, two other points may be measured, and if the direction of the sound field control device 40b can be determined by the method shown below, Measurement at only one point may be used. That is, in the direction determination method, (a) using the direction information of the terminal device 10, (b) it is assumed that the sound field control device 40b is always installed in front of the listener. ) It is possible to take a technique such as using information on the conventional beam automatic adjustment using a speaker array and a microphone.

  The present invention is not limited to the first embodiment and the second embodiment described above, and various applications and modifications described below are possible, for example. In addition, one or more arbitrarily selected aspects of application / deformation described below can be appropriately combined.

  In the first and second embodiments described above, the height (indoor height) of the listening room 60 was not mentioned, but for example, the terminal device 10 measures the altitude of the floor and ceiling or inputs numerical values. Thus, the sound field may be determined in consideration of the information about the indoor height and taking into account the route reaching the listening point after being reflected by the floor and ceiling. Similarly, the height of the installation points a to e (the direction and position of the sound field control device 40a) of the speakers 51 to 55 and the height of the listening point j are also measured and taken into account when determining the sound field. You may do it.

In the embodiment, if the terminal device 10 is a mobile phone, it can be considered as a position equal listening point of the terminal device 10 by storing it in a listener's breast pocket or the like.
However, when the terminal device 10 is relatively large such as a tablet type, for example, as shown in FIG. 11, when the listener L operates the terminal device 10 with the palm, the position information measured by the terminal device 10 is monitored. 30 (speaker 52 or sound field control device 40b) may be offset to a point separated by a distance P on the opposite side, and the offset point may be regarded as a listening point.

  In the embodiment, the steps Sa15 and Sa16 are repeatedly executed every predetermined period unless an instruction to turn off the power is given. However, the listener inputs the movement of the listening position to the terminal device 10 by a touch operation or the like. Thus, the terminal device 10 may perform positioning when the input is received. In this way, the power consumption of the terminal device 10 due to the execution of the positioning function can be suppressed.

The terminal device 10 determines the processing content of the sound field to be assigned, not the sound field control device 40a, and transmits the determined processing content to the sound field control device 40a, while the received processing content is sent to the sound field giving unit 44. It is good also as a structure to set.
In addition, the sound field is determined based only on the position information of the terminal device 10, but a macrophone is installed at the listening point, and a test sound is generated from each speaker and received by the microphone, response characteristics, etc. The sound field to be applied may be determined by using both the measurement result and the position information measured by the terminal device 10 together.

DESCRIPTION OF SYMBOLS 10 ... Terminal device, 20 ... Playback part, 30 ... Monitor, 40a, 40b ... Sound field control apparatus, 42 ... Position information memory | storage part, 43 ... Sound field setting part, 44 ... Sound field provision part, 46 ... Speaker 51- 55 ... speaker, 60 ... listening room.

Claims (5)

A sound field control device that performs signal processing on a plurality of channels of audio signals, supplies the signals to a plurality of speakers, and controls a sound field at a listening point,
A position information storage unit that stores position information of the plurality of speakers and position information corresponding to the listening point measured by the terminal device;
A sound field setting unit that sets the content of the signal processing based on each piece of position information stored in the position information storage unit;
A sound field control device comprising: The location information storage unit
Storing location information specifying the shape of the space including the listening point;
The said sound field setting part estimates the shape of the said space from the positional information which specifies the shape of the said space, and sets the content of the said signal processing according to the said estimated space. The sound field control device described in 1. A sound field control device that performs signal processing on a plurality of audio signals, supplies the signals to a plurality of speakers arranged in a housing, and controls the sound field at the listening point by direct sound and reflected sound,
A position information storage unit that stores the position information of the housing, the position information according to the listening point, and the position information that specifies the shape of the space including the listening point, measured by the terminal device;
A sound field setting unit that sets the content of the signal processing based on each piece of position information stored in the position information storage unit;
A sound field control device comprising: A sound field control method for controlling a sound field at a listening point by performing signal processing on a plurality of channels of audio signals and supplying the signals to a plurality of speakers, respectively.
The position information of the plurality of speakers measured by the terminal device and the position information corresponding to the listening point are respectively stored.
A sound field control method, wherein the content of the signal processing is set based on each stored position information. A sound field control method for performing signal processing on a plurality of audio signals, supplying the signals to a plurality of speakers arranged in a housing, and controlling a sound field at the listening point by direct sound and reflected sound,
The position information measured by the terminal device, the position information according to the listening point, and the position information specifying the shape of the space including the listening point are stored, respectively.
A sound field control method, wherein the content of the signal processing is set based on each stored position information.

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