JPH02266798A - audio output device - Google Patents

Abstract

PURPOSE:To improve the stability of orientation of sounds in the vertical direction by forming the peripheral surface of the conical body of the sound reflecting face of a sound reflector to a convex. CONSTITUTION:A speaker 3 for middle-pitched sound, an audio mirror 5 for middle-pitched sound, a speaker 6 for high-pitched sound, and an audio mirror 7 for high-pitched sound are provided, and audio mirrors 5 and 7 are formed to convex cones. Thus, the directional pattern of sounds in the vertical direction is expanded without changing the directional pattern in the horizontal direction to improve the unstableness of the acoustic field in the vertical direction due to separation of speakers 3 and 6 for high-pitched sounds and middle pitched sounds, and the three-dimensional acoustic field of higher fidelity is reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an audio output device for the purpose of reproducing a three-dimensional sound field with high fidelity as high-fidelity stereo.

[Prior Art] Recently, in the audio field, compact discs (CDs) and digital audio recorders (
With the arrival of the DAT (DAT) era, so-called sound improvements have been remarkable.

FIG. 2 is a diagram showing the main configuration of a conventional audio output device, in which (a) is a front view, (b) is a side view, and (b) is a side view.
c) is a plan view, 8 is a cabinet, 9 is a bass speaker, 10 is a mid-range speaker, 11 is a frame, 12 is a mid-range audio mirror, 13 is a treble speaker, 14 is a treble audio mirror, 15 is a frame.

Conventionally, the ideal listening point was only the apex of an isosceles triangle with the two speakers at its base, but in order to overcome this drawback, we developed an audio mirror for mid-range sound as an acoustic reflector, as shown in Figure 2. 12. This listening point is widened by using the audio mirror 14 for high-pitched sounds (see Japanese Patent Application No. 75144/1983). Figure 3(a) shows the sound distribution by the audio mirror in Figure 2. In the figure, the solid line indicates a line with high sound pressure, the dashed line indicates a line with low sound pressure, and the dashed line indicates a line with low sound pressure.

As is clear from FIG. 3, sound rays with high sound pressure concentrate at the center in the horizontal direction.

[Problem to be solved by the invention] The conventional device "C" as described above does not produce audio even though the bass speaker, mid-range speaker, and treble speaker are vertically separated from each other. Even though the shape of the mirror is conical, the sound in the downward direction is concentrated in the center and the directivity is not sufficient.Therefore, even if the sound field localization is improved, the plane area of the listening position is (
! , r direction), and the sound localization in the middle and high ranges is unstable at either the 1st or lower listening point.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an audio output device which is compact and has a single unit, and which does not deviate from the localization of sounds in the mid-to-high range.

[Means for Solving the Problems] In order to achieve the above-mentioned object, this audio output device has a configuration in which the circumferential surface of the cone on the opposite slope of the sound in the acoustic reflector has a convex shape.

[Operation] According to the above configuration, the stability of the localization of -h'T downward sound can be improved.

[Example] FIGS. 1(a), (b), and (e) show a practical example of the audio output device of the present invention, a top view, and a side view]2
! ! , is a plan view. In Figure 1, 1 is a speaker gear vignette, 2 is a bass speaker, 3 is a midrange speaker, 4 is a frame, 5 is a midrange diomirror, 6 is a treble speaker, and 7 is a treble audio It's a mirror.

Moreover, FIG. 3(b) is a sound line diagram showing the distribution of sound due to the mirror of the present invention shown in FIG. r? Represents a line of low pressure. This is due to the directional characteristics of the sound pressure of the speaker.

In the conventional example shown in FIG. 3(a), the sound ray with high sound pressure is
Figure 3(b)
With the mirror according to the present invention, MIJ with strong sound pressure,
-You can see that it is expanding downward.

In this way, by changing the shape of the audio mirror 5.7 from a conical shape to a convex conical shape, the directional characteristics of the sound in the vertical direction are expanded without changing the directional characteristics in the horizontal direction. It is possible to improve the instability of the sound field in the vertical direction due to the sound speakers 3.6 being separated from each other.

In other words, since each of the audio mirrors 5 and 7 has a convex surface, the instability of the downward sound field is eliminated, making it possible to reproduce a three-dimensional sound field with higher fidelity.

[Effects of the Invention] As explained in 1-1 above, the audio output device of the present invention improves the instability caused by variations in the localization of the upper and lower sounds at the listening point, which were the drawbacks of the conventional ones, and achieves high fidelity. This made it possible to obtain three-dimensional sound field reproduction.

[Brief explanation of drawings]

FIGS. 1(a), (b), and (C) are front views, side views, and plan views showing one practical example of the audio output device of the present invention, and FIG. 2 is the main configuration of a conventional audio output device. Figure 3 (a) is a front view, Figure (b) is a side view, Figure (e) is a plan view, and Figure 3 (a) is a diagram showing the distribution of sound by the audio mirror in Figure 2. The figure shown in FIG. 3 (1) is a sound line diagram showing the distribution of sound due to the mirror of the present invention shown in FIG. In the figure. 1.8: Speaker gear vignette 2.9: Bass speaker 3.10: Mid-range speaker 4a, 4bJ1. Is: Frame 5.12: Audio mirror for medium sound - 6,13: Speaker for high sound 7.4: Audio mirror for high sound Attorney ± 1n Haru Kitatake (a) Figure (b) ( c) (b)

Claims (1)

[Claims] In an audio output device including a speaker and an acoustic reflector that determines the output directivity of the speaker, the cone of the acoustic reflector has an opposite slope. An audio output device characterized by having a circumferential surface having a convex shape.