JPH0445699A - Speaker device - Google Patents

Abstract

PURPOSE:To enable a resonance system to have the 3 degrees of freedom and to enlarge the range of the low range reproduction frequency of a speaker device by making different at least one of each capacity of bisected cabinets or the size of each bass reflex port. CONSTITUTION:A speaker 11 is driven by a electric input signal and a sound radiated from the back is devided into a spatial capacity 16a of a front cabinet and a spatial capacity 16b of a rear cabinet by a sound path port 14. Then, a Helmholtz resonation is operated by both the spatial capacity 16a and a bass reflex port 15a, and also by both the spatial capacity 16b and a bass reflex port 15b. Both Helmholtz resonance frequencies are made different, and set below the minimum of the low frequency reproduction range of the front radiation of the speaker, so that the low frequency reproduction range can be enlarged for a speaker system.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a stereo speaker device.

BACKGROUND ART FIG. 3 shows a side sectional view of a conventional speaker device, in which 1 is a speaker for bass reproduction only or for full-band reproduction;
2 is a cabinet in which the speaker 1 is mounted, and 3 is a bass reflex port attached to the front plate of the cabinet 2.

In the conventional speaker device configured as described above,
The air in the cabinet 2 and the air in the bass reflex port 3 constitute a Helmholtz resonator, which operates as a bass reflex system driven by the speaker 1, exhibiting characteristics as shown in FIG.

FIG. 4 shows an example of the sound pressure frequency characteristics in the conventional example shown in FIG.
The broken line is the sound pressure characteristic radiated from the bass reflex port, and the dashed line is the combined sound pressure characteristic from both sound sources.

Problems to be Solved by the Invention However, the above-described configuration has a problem in that bass reproduction is insufficient even when the cabinet 2 is downsized in consideration of space saving as a recent trend.

In view of this, an object of the present invention is to provide a speaker device that expands the bass reproduction range as much as possible within a space with almost the same conditions as conventional speakers.

Means for Solving the Problems In order to achieve the above object, the present invention provides a cabinet for mounting the speaker, the interior of which is divided by a partition plate and has two volume parts, and a cabinet for installing the speaker from the partition plate. Consists of a sound path port provided near the speaker toward the back, and a bass reflex port provided in each volume of the divided cabinet, and the size of each volume of the divided cabinet or each bass reflex port At least one of them has a different structure.

According to the above-described configuration, the present invention changes the bass reflex boat resonance frequency by varying the cabinet volume or the bass reflex port size of at least one of the divided cabinets and the bass reflex ports attached to each cabinet, thereby improving the low frequency reproduction range. can be expanded.

Embodiment FIG. 1 shows a side sectional view of a speaker device according to an embodiment of the present invention.

In FIG. 1, reference numeral 11 is a speaker exclusively for bass reproduction or a full-band reproduction speaker, 12 is a cabinet, and the speaker 11 is mounted on the front panel of the cabinet. The interior of the cabinet is partitioned into sections by partition plates 13. This partition plate 13 is provided with a sound path port section 14 that guides sound from the speaker 11. 15a is a bass reflex port provided on the front panel of the cabinet, and 15b is a bass reflex port provided on the rear panel of the cabinet. Here, the space volume in the front cabinet is 16a1, and the space volume in the rear cabinet is 16b.

The operation of the speaker device of this embodiment configured as described above will be described below.

The speaker 11 is driven by an electrical input signal and emits sound from the front and rear sides of the speaker.

The sound emitted from the back of the speaker is further transmitted to the sound path port 14.
The space is divided into a front cabinet space volume lea and a back cabinet space volume 16b.

The sound guided by the sound path port 14 performs a Helmholtz resonator operation in the space volume 16a of the front keyer vignette and the bass reflex port 15a. Similarly, the space volume 16b of the rear cabinet and the bass reflex port 15b also operate as a Helmholtz resonator. put it here,
By making the resonance frequencies of both Helmholtz different and setting them below the lower limit of the low frequency reproduction range of the front radiation of the speaker, it becomes possible to expand the low frequency reproduction range of the speaker system.

FIG. 2 shows a characteristic diagram of this embodiment, where the thin solid line (a) is the sound pressure characteristic radiated from the front of the speaker, the - dotted line (b) is the sound pressure characteristic radiated from the bass reflex port 15b, and the thin solid line (a) is the sound pressure characteristic radiated from the front of the speaker. The dashed dotted line (c) is the sound pressure characteristic radiated from the bass reflex port 15a, and the thick solid line (d) is the sound pressure characteristic obtained by combining the sound pressures (a), (1, and (c)) radiated from the above three locations.

As described above, according to this embodiment, among the divided cabinets and the bass reflex ports attached to each part,
The low frequency reproduction range can be expanded by varying the volume of at least one cabinet or the size of the bass reflex port and by varying the bass reflex port resonance frequency.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, there is provided a cabinet for mounting the speaker, the interior of which is divided by a partition plate and has two volume parts, and a cabinet for mounting the speaker from the partition plate toward the back of the speaker. and a bass reflex port provided in each volume of the divided cabinet, and at least one of the volumes of the divided cabinet or the size of each bass reflex port. A resonant system with three degrees of freedom can be created by differentiating the two resonant frequencies, and by setting these resonant frequencies below the lower limit of the low-frequency reproduction of the front radiation of the speaker, the low-frequency reproduction frequency range of the speaker device can be reduced. It can be expanded, and its practical effects are great.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a speaker device according to a first embodiment of the present invention, FIG. 2 is a sound pressure frequency characteristic diagram for explaining the operation of the same embodiment, and FIG. 3 is a side view of a conventional speaker device. The sectional view, FIG. 4, is a sound pressure frequency characteristic diagram in the conventional example shown in FIG. 11...Speaker, 12...Cabinet, 1
3... Partition plate, 14... Sound road po), 1
5a. 15b...Bass reflex port, 16a...Front cabinet space volume, 16b...Rear cabinet space volume. Name of agent: Patent attorney Shigetaka Awano Haka111--
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Claims (1)

[Claims] (1) A speaker, a cabinet for mounting the speaker whose interior is divided into two by a partition plate and has two volume parts, and a sound path port provided close to the speaker from the partition plate toward the back of the speaker; and a bass reflex port provided in each volume of the bisected cabinet, wherein at least one of the volumes of the bisected cabinet or the size of each bass reflex port is different.