JP2006101248A - Sound field compensation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound field compensation device for realizing ideal reproduction environment even in a case of irregular arrangement of speakers. <P>SOLUTION: In the sound field compensation device, each source channel signal of a multi-channel signal reproduced from two or more speakers arranged in an irregular form is subjected to signal processing, and sound field compensation is performed. The sound field compensation device includes a direction control unit 100 for performing magnitude adjustment by adding a magnitude of level distribution corresponding to angle information from a base arrangement position where the reproduction should be carried out originally, and angle information of an angle with adjoining speakers; and a distance control unit 200 for performing delay adjustment and magnitude adjustment of each source channel signal, which was generated from the direction control unit, according to a length from a listener's position to the speaker arrangement position. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sound field correction apparatus that performs sound field correction by processing each source channel signal of a multi-channel signal reproduced from a plurality of speakers arranged irregularly.

  Conventionally, in order to reproduce a multi-channel signal, it is known that an ideal sound field can be reproduced by using a speaker arrangement as shown in FIG. That is, the 7-channel speakers C, L, R, SL, SR, BL, and BR are aligned at concentric positions so that the distance from the listener is the same with the listener as the center, and the front of the listener An ideal sound field can be reproduced by arranging between the speakers C and L, only between C and R at intervals of 30 °, and arranging other speaker intervals at intervals of 60 °.

  However, in an ordinary home, it is difficult to realize an ideal speaker arrangement as shown in FIG. 2 due to the position of furniture and the layout of windows and doors. For example, as shown in FIG. 3, the layout is often irregularly shaped in various directions and distances from the original ideal speaker layout.

Conventionally, the only technology to correct the speaker placement defect is time delay control to correct the speaker distance, and bass control (Bass Management) to correct the speaker size (reproduction frequency band). (For example, see Patent Documents 1 and 2 below). For this reason, an ideal reproduction environment could not be obtained in an irregularly shaped speaker arrangement with various directions and distances.
JP 2000-354300 A Japanese Patent Laid-Open No. 10-285699

  Accordingly, an object of the present invention is to provide a sound field correction apparatus that can realize an ideal reproduction environment even in such an irregular speaker arrangement.

As means for achieving the above object, the sound field correction apparatus according to the present invention is irregularly arranged with respect to a basic arrangement position in which a plurality of speakers are arranged at an equal distance and a predetermined angle from the listener position. In a sound field correction apparatus for performing sound field correction by performing signal processing on each source channel signal of a multi-channel signal reproduced from a plurality of speakers,
Direction control for adjusting the amplitude of each source channel signal of the multi-channel signal by adding the amplitude of level distribution according to the angle information from the basic arrangement position to be reproduced and the angle information between adjacent speakers. And
A distance control unit that performs delay adjustment and amplitude adjustment according to the distance from the listener position to the speaker placement position for each source channel signal output from the direction control unit,
It is characterized by having.

  The sound field correction apparatus of the present invention adds the amplitude of each source channel signal of the multi-channel signal to the amplitude of the level distribution according to the angle information from the basic arrangement position where the original reproduction should be performed and the angle information between the adjacent speakers. By adjusting the amplitude and delaying and adjusting the amplitude according to the distance from the listener position to the speaker placement position for each source channel signal, a near ideal sound field can be obtained even with an irregular speaker placement. it can.

  FIG. 1 is a block diagram showing a configuration of a sound field correction apparatus according to an embodiment of the present invention. The sound field correction apparatus shown in FIG. 1 uses the angle information from the ideal speaker arrangement position, which is the basic arrangement position where reproduction should be performed, and the angle information between adjacent speakers as the amplitude of each source channel signal of the multichannel signal. Direction control unit 100 that adjusts the amplitude by adding the amplitude of the level distribution according to the level, and delay adjustment and amplitude according to the distance from the listener position to the speaker placement position for each source channel signal output from direction control unit 100 A distance control unit 200 that performs the adjustment is provided, and even with an irregularly shaped speaker arrangement with various directions and distances as shown in FIG. 3, a sound field equivalent to the ideal speaker arrangement as shown in FIG. 2 is reproduced.

  The direction control unit 100 is an angle from the ideal speaker arrangement position that should be reproduced for each source channel signal of the multi-channel signals corresponding to the plurality of speakers C, L, R, SL, SR, BL, and BR. A pair of amplifiers 11a and 11b, 12a and 12b corresponding to each of the speakers C, L, R, SL, SR, BL and BR, the amplitude of which is adjusted according to the level distribution according to the angle information between the information and the adjacent speakers. 13a and 13b, 14a and 14b, 15a and 15b, 16a and 16b, 17a and 17b, and the outputs of each pair of amplifiers are added to support multiple speakers C, L, R, SL, SR, BL, and BR In addition, adders 21 to 27 that output each source channel signal in consideration of the reproduction direction (angle) of each speaker are provided.

  Further, the distance control unit 200 receives the amplitude-adjusted source channel signals output from the direction control unit 100 from the listener position to the arrangement positions of the speakers C, L, R, SL, SR, BL, and BR. Are provided with amplifiers 41 to 47 for adjusting the amplitude in order to correct the increase and decrease of the sound volume according to the distance with respect to the outputs of the variable delay devices 31 to 37. Yes. When performing bass management, it is performed on the output after the distance control unit 200.

Here, an algorithm for correcting the sound field in consideration of the reproduction direction (angle) of the speaker in the direction control unit 100 will be described.
First, while maintaining the direction (angle) of the speaker arranged in a general home as shown in FIG. 3, the distance from the listener position is the same with the listener position as the center, as shown in FIG. In addition, the positions of the speakers C, L, R, SL, SR, BL and BR are considered.

  In order to reproduce the speaker arrangement as shown in FIG. 4 so that it is reproduced from the position of the correct speaker that should be originally, taking the speaker C as an example, according to the angle information from the speaker R adjacent to the speaker C. This can be perceived by adding an appropriate level distribution amplitude (the left line segment from speaker C and speaker R shown in FIG. 4). That is, the displacement angle of the speaker C actually arranged with respect to the correct position of the speaker C is X, and the angle formed by the actual position of the speaker R with respect to the correct position of the speaker C is Y. Assuming that the amplitude to be given is gfcl, the output levels gC and gR of the speakers C and R can be obtained by the following equations.

  Here, since the reproduced sound is always from two adjacent speakers, how to set the amplitude coefficient (amplification degree) of the pair of amplifiers for adjusting the amplitude, as shown in FIG. In addition, an algorithm is required for switching which two speakers output the amplifier output and determining which adder adds the outputs of the pair of amplifiers.

  In order to reproduce the sound of one channel, the amplitude coefficient of a pair of amplifiers and a signal obtained by multiplying the amplitude coefficient of the amplifier from the positional information of the speaker to be originally reproduced and the positional relationship information of the actually placed speaker are obtained. What information should be obtained from which two speakers is used for reproduction. When this is performed for each channel, a configuration like the direction control unit 100 shown in FIG. 1 is obtained. As can be understood from FIG. 4, in order to correct the current sound field to a desired correct sound field, reproduction is performed with speakers distributed at two positions on the left and right of the desired speaker position and with a level distribution according to the angle. Therefore, it can be realized if there is information on which speaker to output the data obtained by multiplying the amplitude coefficient of the pair of amplifiers and the amplitude coefficient.

Furthermore, a sound field correction algorithm that takes into account the distance from the listener position to the speaker placement position in the distance control unit 200 will be described.
Considering the case of FIG. 5 in which the distance from the listener position to the speaker placement position is considered in FIG. 4, in the case of a speaker far from the listener position in the case of a speaker near the listener position, the volume is reduced and delayed. Can correct the distance by increasing the volume and shortening the delay time. This delay is performed by the variable delay devices 31 to 37, and the volume (amplitude) is adjusted by the amplifiers 41 to 47. If this is shown, it will become the structure of the distance control part 200 of FIG.

  Next, the speaker arrangement based on the amplitude coefficient of the amplifier in the sound field correction in consideration of the reproduction direction (angle) of the speaker in the direction control unit 100 of the sound field correction apparatus shown in FIG. 1 and the listener position in the distance control unit 200 The setting of the delay amount of the variable delay device for sound field correction taking into account the distance to the position and the amplitude adjustment amount of the amplifier will be described with reference to the flowchart shown in FIG.

  FIG. 6 shows an amplifier for correcting a sound field in consideration of a reproduction direction (angle) of a speaker using a GUI (Graphical User Interface) (not shown) as a user interface provided in the sound field correction apparatus shown in FIG. 4 represents an algorithm for explaining the function of calculating the delay amount of the variable delay device for sound field correction and the amplitude adjustment amount of the amplifier in consideration of the level distribution coefficient, the distance from the listener position to the speaker placement position.

  First, in order to specify the position of the speaker, the position of the speaker is input using a GUI, and the ideal speaker arrangement shown in FIG. 2 is displayed on an OSD (on-screen display) (not shown) (step) S1). From this display, the user moves to the position of the speaker shown in FIG. 3 which is actually irregularly arranged by dragging and dropping through the GUI (step S2). Finally, the display is determined when the arrangement relationship between the speakers is determined (step S3), and the coordinate positions of the ideal speaker arrangement position and the irregular speaker arrangement position are detected (step S4).

  Next, from the relationship between the listener position and the irregularly arranged speaker position, as shown in FIG. 4, the angle X from the ideal speaker arrangement position to be originally reproduced and the angle Y between adjacent speakers, and The distance from the listener position (center) to the speaker placement position is calculated (step S5), and based on this, the level distribution coefficient of the pair of amplitude units of the direction control unit 100 shown in FIG. The delay amounts of the delay units 31 to 37 and the amplitude adjustment amounts of the amplifiers 41 to 47 are calculated (step S6), and coefficients are set in the amplifiers 41 to 47 and the variable delay units 31 to 37, respectively (step S7).

  In addition to the method using the GUI shown in FIG. 6, the speaker positional relationship and distance can be specified by the principle of triangulation shown in FIG. 7, for example. That is, test signals are reproduced from each speaker one by one in order, and the remaining speakers calculate the positional relationship of the speakers from the microphone input information using the microphones embedded in the speakers in advance, and triangulation is performed from the information. Based on the principle, the positional relationship and distance of each speaker is specified. Moreover, you may measure the vibration surface of a speaker instead of a microphone instead of a microphone. In addition, the speaker reproduction band can also be acquired as information, and the delay time and bass can be managed. This is a function to output a signal to a reproducible speaker or output a signal to an LFE speaker when a low frequency component cannot be reproduced from the reproduction frequency band of each speaker. Therefore, it is possible to have a function of recombining low-frequency components to a reproducible speaker.

It is a block diagram which shows the structure of the sound field correction apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed ideal speaker arrangement | positioning. It is explanatory drawing which shows the example of the irregular speaker arrangement | positioning in a general home. It is explanatory drawing which shows the example of speaker arrangement | positioning which made the distance from a listener position equidistant centering on a listener position, maintaining the unshaped speaker direction (angle) in a general household. It is explanatory drawing of the final output level output from each speaker in this invention. The sound field considering the level distribution coefficient of the amplifier considering the reproduction direction (angle) of the speaker using the GUI function and the distance from the listener position to the speaker arrangement position in the sound field correction apparatus according to the embodiment of the present invention It is a flowchart which shows the algorithm for calculating the delay amount of a correction | amendment variable delay device, and the amplitude adjustment amount of an amplifier. It is explanatory drawing which shows the example for pinpointing the positional relationship and distance of each speaker by the principle by triangulation in this invention.

Explanation of symbols

11a to 17a, 11b to 17b, 41 to 47 Amplifier 21 to 27 Adder 31 to 37 Variable delay device 100 Direction control unit 200 Distance control unit C, L, R, SL, SR, BL, BR Speaker

Claims (2)

Signal processing is performed on each source channel signal of a multi-channel signal reproduced from a plurality of speakers irregularly arranged with respect to a basic arrangement position in which a plurality of speakers are arranged at an equal distance and a predetermined angle from a listener position. In a sound field correction apparatus that performs sound field correction,
Direction control for adjusting the amplitude of each source channel signal of the multi-channel signal by adding the amplitude of level distribution according to the angle information from the basic arrangement position to be reproduced and the angle information between adjacent speakers. And
A distance control unit that performs delay adjustment and amplitude adjustment according to the distance from the listener position to the speaker placement position for each source channel signal output from the direction control unit,
A sound field correction apparatus comprising: Each speaker is moved from the basic layout position displayed graphically using a user interface to an actual speaker layout position to detect the coordinate positions of a plurality of irregularly arranged speakers, and the speaker positions are irregularly formed. Calculating the angle information from the basic arrangement position to be originally reproduced and the angle information between adjacent speakers and the distance from the listener position to each speaker position from the relationship with the arrangement position of each speaker arranged; 2. The sound field correction apparatus according to claim 1, wherein a level distribution coefficient and an amplitude adjustment amount for amplitude adjustment and a delay amount for delay adjustment are calculated.

Images