JPS6154800A - Speaker system for stereo - Google Patents

Abstract

PURPOSE:To enlarge a scope which can hear without losing a stereo feeling by inclining plural speakers receiving two overlapped frequencies to the inside, arranging horizontally, attenuating a lead sound for a delay sound and deleting a harsh effect. CONSTITUTION:Speaker units M1 and M2 are the same impedance, the same shape, the same dimensions, and the cabinet 10 is inclined by respective theta angles for the front and fitted diagonally for the cabinet 10, and the speaker units M1 and M2 are in charge of the same band as the same frequency band, and theta is actually set to 30-45 deg.. When the sound pressure is equal by two hearing points 0 and 0', the units are the same as the above-mentioned conventional example, and since two speaker units M1 and M2 are arranged in the horizontal direction, a harsh effect is deleted by the composite directional characteristic.

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 and Problems Therewith] FIG. 4 shows a method for enlarging the area that can be heard with a three-dimensional stereo effect of the conventionally used stereo speaker system as described above.

A speaker system having SEC-type directional characteristics shown in FIG. 5 and a speaker system having CO3-type directional characteristics shown in FIGS. 6 and 7 are known.

In an SEC type speaker system consisting of speaker 1 for medium and high frequencies and speaker 2 for bass, at least speaker 1
By attaching it to cabinet 3 facing inward,
Its directional characteristics are controlled as shown in FIG.

A CO8 type speaker system consisting of a speaker 4 for medium and high frequencies and a speaker 5 for bass sounds is mounted on a baffle board 6 with the speaker 4 facing inward, and the speaker 5 is mounted on a cabinet 7.
It has a figure-eight directional characteristic as shown in Figure 7.

In these stereo speaker systems, depending on their directional characteristics, the listening position can be changed from pl to ps as shown in Figure 8.
Even if the sound pressure from the left and right speaker systems L and R is changed, the sound pressure from each speaker system L and R should be 11 to β5,
It is designed to change like γi'''rs.

However, in this conventional stereo speaker system, although the arriving sound pressures at the listening position are equal as described above, the actual loudness is not equal in areas other than the center.

That is, the listening positions pI yp2 , p4 biased to the left and right
.

In p5, this is due to the Haas effect caused by a delay in the arrival time of the sound from the left and right speaker systems L and R, and the localization is determined by the preceding sound that arrives first, so it is still possible to obtain a sufficient stereo feeling. I couldn't.

[Purpose of the invention]

In order to eliminate the above-mentioned drawbacks of conventional stereo speaker systems, the present invention aims to attenuate the preceding sound that arrives first, eliminate the Haas effect, and expand the listening range with a good stereo feeling. It is something.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

M+ and M2 are speaker units having the same impedance, the same shape, and the same dimensions, and the cabinet 10 is mounted obliquely to the cabinet IO with its head at an angle θ with respect to the front, and the speaker unit M+
, Ma are responsible for the same frequency band, and θ is actually set to 30 to 45°.

If the sound pressure is equal at the two listening points 0 and O' at this time, it is the same as the conventional example described above, but the speaker unit M
Since the two beams 1 and M2 are arranged horizontally, the Haas effect is canceled out by their combined directional characteristics.

For example, if the left and right speaker systems L and R and the listening point 01 are set at 2m as shown in Figure 2, the left and right speaker systems L and R are set at 2m.
, when the distance from speaker system L to listening point 01 is 2 m, and the distance from speaker system R to listening point 01 is 2.8 m, the difference in arrival time from left and right speaker systems L and R is 2.4 milliseconds.

Considering the Haas effect at this time, when the preceding sound from the speaker system L is reduced by 7 dB with respect to the delayed sound from the speaker system R, the two sounds will be heard as approximately the same.

In this way, the sound from nearby sources is reduced to balance it with the sound from distant sources, and the localization is centered. (The physical sound pressure for the delay is approximately 7 dB at that position.
However, in FIG. 1, routes a and b to listening point 0' are delayed sounds, and routes C and d to listening point 0 are leading sounds.

Since routes a and b are equidistant, listening point 0'
In this case, the synthesized sound of speaker units Ml and M2 will be higher, but because there is a difference in distance from listening point 0 between routes C and d,
Interference occurs at frequencies that match this, resulting in a valley in the frequency characteristics.

The third figure shows the frequency sound pressure characteristics at listening points O and θ'.
In the figure, the level of the preceding sound decreases in the range indicated by the chain line in the figure, thereby canceling out the Haas effect.

〔Effect of the invention〕

As described above, the present invention attenuates the preceding sound relative to the delayed sound and cancels the Haas effect by tilting a plurality of speakers receiving two overlapping frequencies inward and arranging them side by side.

Therefore, even if you listen at a position that is biased to one side from the center of the left and right speaker systems and the arrival time of the sound is slow, the sound of the center component will be localized to the center, and the sound of the left and right components will be localized to the left and right. It is possible to expand the listening range without losing the stereo feeling.

[Brief Description of the Drawings] Fig. 1 is a plan view showing one embodiment of the present invention, Fig. 2 is an explanatory diagram thereof, Fig. 3 is a frequency sound pressure characteristic diagram at two listening points, Figs. The figure shows a plan view and a directional characteristic diagram of an SEC type system, FIGS. 6 and 7 show a plan view and a directional characteristic diagram of a COS type system, and FIG. 8 is an explanatory diagram in the case of five listening points. M+, M2...Speaker unit, 10...Cabinet, θ...Speaker installation angle, 0,0'...Listening point, a, b, c, d...Path. 0. 0 Figure 3 side liquid son lol H2 Figure 4 Figure 5 Figure 6 Figure 6 Shi = 1 Three stables tenho plagiarism: (self-motivated) January 30, 1985 'I-' + Office Director General Shiga 47 Lord 1. Indication of the case 1982 Patent Application No. 176551 2.
Name of the invention Stereo speaker system 3 1 Relationship with Hanyu, the person who performs Yamasho Patent Applicant address 1-4-1 Meguro, Meguro-ku, Tokyo (501)
) Nomaionia Co., Ltd. (Company 4, Agent 5, Date of amendment order: Showa, Month, Day 6, Number of inventions increased by amendment 7, Subject of amendment 8゜ Contents of amendment Contents of amendment as shown in the attached sheet (Patent application filed in 1983) 17 [No. i 551-] Regarding this application, a part of the specification is amended as follows. Note 1. Even if the claimed scope of the claim overlaps in frequency band, a single speaker unit with two pieces of the same speaker unit is A stereo speaker system characterized in that the speaker units 1111 are arranged side by side in such a way that the sound pressure from the speaker unit 1111 is attenuated for a listening position close to the speaker system on the grounded side. 2, page 4, line 3. "Cabinet..."
First, we will delete J and make corrections.

Claims (1)

[Claims] Two speaker units having overlapping frequency bands are arranged side by side in a horizontal direction so that the sound pressure from the speaker units is attenuated for a listening position close to the speaker system on the side where the speaker units are grounded. Features a stereo speaker system.