JPS6154794A - Speaker system for stereo - Google Patents

Abstract

PURPOSE:To obtain good directivity ranging to a wide band and a good three- dimensional feeling even at a position except a center of a right and a left speaker systems by arranging plural speaker units receiving the same frequency in the horizontal direction, increasing apparent radius and arranging respective speaker units by inclining to the front and with an angle. CONSTITUTION:Speaker units 15a and 15b are fitted at a cabinet 16 by giving difference in level to a flange surface so that distance up to a hearing position B can be equal. Consequently, the distance from the speaker units 15a and 15b becomes equal at the hearing position B and distance difference can be made small even at a hearing position C.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a stereo speaker system in which speaker systems are arranged at left and right positions to provide a three-dimensional sound image.

[Technical Background of the Invention 1 and Problems Therewith] In such a conventional stereo speaker system, as shown in FIG. 6, the speaker systems la and lb arranged on the left and right sides are arranged facing the front. is the most common, and each speaker system la, lb has a directional characteristic represented by three lines.

Therefore, the sound pressures of both speaker systems 1a and lb relative to the listening position W2a at the center of both speaker systems la and lb are expressed as 4a and 4b, respectively.Since the sound pressures 4a and 4b are equal, the sound image is localized at the center, which is good. A comfortable listening condition can be obtained.

However, at the listening position 2b which is off the center, the sound pressure from the speaker system la is weakened to 4C, and on the contrary, the sound pressure from the speaker system 1b is strong to 4d, and the distance from the listening position 2b to the speaker system 1b is , is shorter than the distance to the speaker system 1a, most of the sound images are concentrated on the speaker system 1b, making it impossible to listen in three dimensions.

As a method to improve this, as shown in FIG. It may have an SEC type directional characteristic represented by nine lines as shown in Figure 8.

In this case, for the listening position 8a at the center of the left and right speaker systems 7a, 7b, the sound pressures 9a, 9 in this direction are
Since b is equal and the distances to the left and right speaker systems 7a and 7b are also equal, a good listening condition can be obtained as in the case of FIG. 6.

On the other hand, at the off-center listening position 8b, the sound pressure from the speaker system 7b decreases to 10d, the sound pressure from the speaker system 7a increases to 10c, and the distance from the speaker system 7a to the speaker system 7b increases. Since the distance is longer than the distance, the sound pressures from the left and right sides at the listening position 8b are approximately equal, and a good listening condition can be obtained.

However, in order to utilize the directional characteristics of the speaker unit 5 to obtain the directional characteristics shown in FIG.
(If the wavelength is λ, then = 1/λ, a - diaphragm radius) The effect decreases below the frequency that satisfies the following.

In addition, at frequencies above which the above formula is satisfied, the cone begins to vibrate in divided vibrations, resulting in poor quality reproduced sound.

[Purpose of the invention]

The present invention is intended to eliminate the above-mentioned drawbacks of conventional stereo speaker units, and includes a plurality of speaker units each having a directional band, each having a step on its flange surface, and tilted toward the center. The purpose of this system is to provide a stereo speaker system that can obtain good directivity over a wide band by arranging the speakers side by side, and provide a good three-dimensional effect even at positions other than the center of the left and right speaker systems. be.

[Example of the present invention]

The prerequisite configuration of the configuration of the present invention will be explained with reference to FIGS. 3 to 5.

If two speakers 11 for the same range are arranged horizontally as shown in Fig. 3 instead of the speaker unit 5 for the mid-high range of the speaker system in Fig. 7, the apparent horizontal direction As the radius increases, the frequency that satisfies the above equation becomes lower, and therefore the frequency at which the SEC type directivity characteristic shown in Fig. 8 can be obtained spreads toward the lower range, and the three-dimensional sound sensation is increased at the off-center position 8b. You will be able to extend the resulting frequency to a lower range.

However, since there are a plurality of speaker units 11, as shown in FIG.
This causes large dips and peaks in the frequency sound pressure depending on the listening position.

For example, for the 3 positions A, B, and C in Figure 4, the characteristics will be as shown in A, B, and C in the frequency sound pressure characteristic diagram in Figure 5, and especially large peaks and dips such as C. will occur.

The present invention also eliminates such peaks and dips, and one embodiment thereof will be described with reference to FIGS. 1 and 2.

In FIG. 1, 15a and 15b are speaker units for medium and high frequency ranges, 16 is a cabinet thereof, 17 is a speaker unit for low frequency ranges, 18 is a cabinet thereof, and speaker units 15a and 15b are , listening position B
The flange is attached to the cabinet 16 with a step on its flange surface so that the distances from the flange to the flange are equal.

Therefore, at listening position B, the speaker units 15a, 15
The distances from B are equal, and the distance difference at listening position C can be made smaller than in FIG.

Therefore, the peaks and dips at the listening position eC due to the path difference become small as shown in C in the frequency sound pressure characteristic diagram in Figure 2, and the peaks and dips in the frequency sound pressure characteristics reduce the sound image at a specific frequency. Movement can be prevented.

In the embodiment shown in FIG. 2, the cabinet 16 for medium and high ranges according to the present invention is installed on top of the cabinet 1g for low ranges due to the ease of making the cabinet.
It can also be implemented as a one-piece cabinet.

Further, the present invention can also be applied to a speaker unit for all sound ranges.

〔Effect of the invention〕

As described above, in the present invention, a plurality of speaker units receiving the same frequency are arranged horizontally to increase the apparent radius, and each speaker unit is arranged at an angle with respect to the front. Utilizing the directivity of the unit, it is possible to obtain frequency characteristics close to those of the SEC type, and to extend these characteristics to frequencies lower than conventional ones.

Then, by creating a step on the flange surface of each speaker unit, we reduce the peaks and dips in the frequency sound pressure characteristics due to the path difference from each speaker unit at a point W away from the center of the left and right speaker systems, and reduce the sound image at a specific frequency. It is possible to reduce the unsteadiness of the image.

As described above, the present invention enables good stereo listening with a three-dimensional effect in a wide range other than on the center line of the left and right speaker systems.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a frequency sound pressure characteristic diagram at each listening position, FIG. 3 is a plan view of the prerequisite state of the present invention, and FIGS. 4 and 5 Figure 6 is a plan view of a conventional stereo speaker system, Figure 7 is a plan view of a speaker system for obtaining SEC type directivity characteristics, and Figure 8 is a diagram of its listening position and frequency sound pressure characteristics. FIG. 2 is a plan view of a stereo speaker system. 15a, 15b...Speaker units for high and medium ranges,
16...The cabinet, 17...Speaker unit for low range, 18...The cabinet, A, B
, C...Listening position and sound pressure at that position. Patent applicant: Pioneer Corporation
Director Hideo Takino Figure 2

Claims (1)

[Claims] A plurality of speaker units that handle the same frequency band are arranged side by side so that each speaker unit faces horizontally at the same angle to the front, and the flange is arranged so that a step is created on the flange surface of each speaker unit. A stereo speaker system characterized by having surfaces arranged at different positions.