KR20170046368A - A driving speaker selection method for optimal sweet spot in 2-dimensional speaker layout - Google Patents

Abstract

The present invention discloses a method for selecting a speaker to be driven for an optimal sweet spot in a two-dimensional speaker layout when a user listens to stereo sound through three or more multi-speakers arranged in two dimensions. The present invention comprises: a position analyzer for analyzing a positional relationship by calculating a mutual distance based on a speaker position and a listening position; a performance index calculator for calculating a performance index for each pair of speakers as a result of the analysis; and a speaker selection unit for selecting the speaker to be finally driven based on the performance index.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of selecting a driving speaker for an optimal sweet spot in a two-dimensional array speaker environment.

The present invention relates to a method of selectively driving a speaker when listening to stereo sound through three or more multi-speakers arranged in two dimensions, and more particularly, to a method of selectively driving a sweet spot spot of a speaker.

Listening to stereo sound through a speaker changes the sound input to the listener's ears according to the listening position, resulting in a change in the sense of space in which the listener perceives the sound. A cross-talk canceller (CTC) is used to provide the listener with a consistent sound sense of space regardless of the listening position. That is, by using the CTC, each channel signal of the stereo sound is input one by one to each of the listeners, so that the right channel output is not input to the left ear and the left channel signal is not inputted to the right ear. In addition, the CTC is designed differently depending on the listening position for the desired signal cancellation.

However, in a real listening environment, the listener's head keeps moving a little bit, and therefore the listener often listens at a position slightly deviated from the intended CTC position, and in this case, the crosstalk should be removed with the desired level of performance. Thus, the listening area where the CTC designed for a specific target position removes crosstalk more than the reference performance is called a sweet spot.

As described above, the CTC must provide a sweet spot of sufficient size to perform stable operation in a real environment, and an additional CTC operation method is required for this purpose.

According to the conventional art, in an environment of listening to stereo sound through various speakers, all the speakers are driven to listen to the output sound. In this case, the size of the sweet spot is very small. In order to solve this problem, the present invention proposes a method for selecting and driving only some speakers among all given speakers in order to expand the sweet spot size in a multi-speaker environment. Particularly, when three or more speakers are arranged in two dimensions, it is an object of the present invention to select a driving speaker for providing an optimum sweet spot according to a speaker position and a listening position.

According to another aspect of the present invention, there is provided a method of driving a speaker, the method comprising: calculating distance and mutual positional relationship between each speaker position and the listening position according to two-dimensionally arranged speaker positions and listening positions; Calculates a figure of merit corresponding to each speaker pair from each calculated result, and determines a speaker pair to be driven according to the figure of merit of each speaker pair.

According to an embodiment of the present invention, by listening to a sound by selecting a driving speaker variably according to a given speaker position and listening position, the listener can obtain an optimum sweet spot, can do.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 schematically illustrates a method of selecting a driving speaker according to an embodiment of the present invention; FIG.
2 is a view showing a structure in which four speakers are arranged in a circular shape in a two-dimensional plane.
Fig. 3 is a view showing a sweet spot size at each listening position when driving all speakers according to the prior art when four speakers are arranged in a circle in a two-dimensional plane. Fig.
FIG. 4 illustrates the sweet spot size at each listening position when driving a selected speaker according to an embodiment of the present invention when four speakers are arranged in a circular shape in a two-dimensional plane; FIG.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings and mathematical formulas.

1 is a block diagram illustrating the operation of a drive speaker selection device 100 for selecting a speaker to be driven to provide an optimum sweet spot, given a speaker position 101 and a listening position 102, according to an embodiment of the present invention. Fig. 1, the driving speaker selecting apparatus 100 includes a position analyzing unit 103, a figure of merit calculating unit 105, and a speaker selecting unit 107.

The speaker position 101 and the listening position 102 are given coordinates (x, y) in a two-dimensional plane, respectively. The position analyzer 103 calculates distances between the two speaker positions 101 and the listening position 102 of the speaker pair, for each speaker pair. In addition, the position analyzer 103 obtains the ratio of dividing the straight line when the straight line connecting the two speakers of the speaker pair and the listening position 102 are perpendicularly connected to each speaker pair. 2 shows an example in which four speakers 201, 202, 203 and 204 are arranged in a circular form in a two-dimensional plane and the position of the listener 205 corresponds to the listening position 102 . For both speakers 201 and 203, the distance 206 and 207 between each speaker position 101 and the listening position 102 are calculated. In addition, when the straight line connecting the pair of speakers 201 and 203 and the listening position 201 are connected at right angles, two distances 208 and 209 in which the straight line is divided are calculated. The values of the calculated distances 206, 207, 208, and 209 are denoted by d1, d2, d3, and d4, respectively. The position analyzer 103 repeatedly calculates d1, d2, d3, and d4 for all speaker pairs and outputs four values to the position information 104 for each speaker pair.

The figure of merit calculating unit 105 calculates a figure of merit 106 for each speaker pair, which corresponds to the sweet spot performance estimate when the speaker pair is selected. Referring to FIG. 2, given position information (104, d1, d2, d3, d4) for the speaker pairs 201 and 203, D1 and D2 are calculated according to Equation (1) The exponent 106 is calculated.

The speaker selection unit 107 inputs the figure of merit 106 for each speaker pair and determines the speaker pair 108 that is closest to the value of the figure of merit 106 as the last selected speaker pair 108 and outputs it. When the final speaker pair 108 is determined according to the above process, only the speaker 108 of the given speaker is driven to output sound.

3 shows that when four speakers 201, 202, 203 and 204 are arranged at intervals of 60 degrees on a circle having a radius of 3 m in FIG. 2, 201, 202, 203, and 204 are all driven, the sweet spot size at each listening position 102 is shown through a simulation. The reference point (x, y) = (0, 0) of the listening position 102 corresponds to the center of the circle. As shown in FIG. 3, if the listening position 102 deviates from the center (x, y) = (0, 0) of the speaker array, the sweet spot size decreases greatly.

FIG. 4 shows a result of simulating a sweet spot size at each listening position 102 when a speaker is selected and driven according to an embodiment of the present invention, with respect to the same speaker arrangement as FIG. Compared with the results of FIG. 3, it can be seen that providing all of the listening spots 102 have sweet spots of an extended size.

Claims (5)

In an environment in which two or more speakers are arranged in a two-dimensional space, the speakers are driven to output stereo sound, and the sound is heard at a given listening position, a driving speaker In the selection device,
A position analyzer for analyzing a positional relationship between the speaker and the listener using the position of each speaker and the listening position; And
A performance index calculating unit for calculating a performance index of the speaker based on the positional relationship; And
A speaker selection unit for determining a speaker to be finally driven according to a performance index of the speaker,
And a driving speaker selection unit
The apparatus according to claim 1,
And calculates a first distance and a second distance between each speaker of each speaker pair of the speaker and the listening position, The apparatus according to claim 1,
And calculates a third distance and a fourth distance at which the connection line is divided when the two speaker connection lines of each speaker pair of the speaker are connected at right angles to the listening position. 2. The speaker system according to claim 1, wherein the figure of merit calculating unit comprises:
Determining a first ratio by determining a ratio of the first distance to the second distance,
Determining a second ratio by obtaining a ratio of the third distance to the fourth distance,
And a ratio of the first ratio to the second ratio is determined to determine a figure of merit The apparatus of claim 1,
And selects a speaker pair whose performance index is closest to 1 among the pair of speakers as a final driving speaker.

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