JPH06165276A - Speaker equipment and television receiver using the speaker - Google Patents

Abstract

PURPOSE:To provide the speaker equipment with an excellent acoustic characteristic and rich in cost performance by solving problems of disturbance in the reproduction sound pressure frequency characteristic at a medium and high frequency reproduction bands and lots of use of sound absorbing members to prevent deterioration in the articulation of a human voice resulting in cost increase with respect to the speaker equipment applied to a video equipment such as a television receiver. CONSTITUTION:A 1st reflection plate 16 and a 2nd reflection plate 17 are arranged to a front face of a speaker unit 19 to correct the acoustic characteristic and a gap 22 between the 1st reflection plate 16 and the 2nd reflection plate 17 has a gap leading to a space 23 and a 1st sound absorbing member 12 and a 2nd sound absorbing member 13 of different kinds from each other are combined and inserted to one side or both sides of the space 23, then the disturbance in the reproduction sound pressure frequency characteristic due to a standing wave is suppressed by a small amount of sound absorption member and the deterioration in the sound pressure at medium and high frequencies is suppressed to improve the voice articulation in this speaker equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device, which is mainly used in a video device such as a television receiver and has an acoustic tube for guiding sound waves coupled to the front surface of a speaker, and a television receiver using the speaker device. is there.

[0002]

2. Description of the Related Art A method in which a horn or an acoustic tube is provided on the front surface of a speaker and a sound wave generated from the speaker is guided to an opening can obtain a large output sound pressure as compared with the case where a horn or an acoustic tube is not used. , Has the advantage that sound can be transmitted in a specific direction, and has been widely used in the past.

A conventional speaker device using an acoustic tube will be described below with reference to the drawings. FIG. 4 is a structural conceptual diagram of a television receiver incorporating the above-described conventional speaker device. In FIG. 4, 1 is an acoustic tube, 8 is a speaker unit, 26 is a television cabinet, 27 is a cathode ray tube, 28
Represents a back cavity.

The operation of the television receiver incorporating the speaker device constructed as described above will be described. As shown in FIG. 4, a speaker device in which a sound tube 1 for guiding sound waves is arranged on the front surface of a speaker unit 8 is built in along with a cathode ray tube 27 inside a television receiver, and a TV cabinet 26 is provided in the speaker device. By adopting a structure that conforms to, it is possible to make the television receiver smaller and slimmer.

FIG. 3 is a plan sectional view showing the structure of the conventional speaker device. In FIG. 3, 9 is a diaphragm of the speaker unit 8 for generating sound waves, 10 is an edge rib for hermetically connecting the speaker unit 8 and the acoustic tube 1, and 7 is a narrowing portion of the throat provided on the front surface of the speaker unit 8. Reference numerals 5 and 6 are a first reflection plate and a second reflection plate provided on both sides for guiding the sound wave radiated from the speaker unit 8 to the opening 3 of the acoustic tube 1.
Is a sound absorbing material, and 4 is a sound path through which sound waves pass.

The operation of the conventional speaker device configured as described above will be described below. First, when an input signal is applied to the speaker unit 8, the diaphragm 9 of the speaker unit 8 vibrates, and its sound wave is emitted from the opening 3 of the acoustic tube 1 through the sound path 4 inside the acoustic tube 1. .

However, since the acoustic impedance is largely changed in the opening 3 of the acoustic tube 1, a part of the sound wave is reflected and returns to the sound path 4 to form a standing wave, and the length of the acoustic tube 1 is increased. Due to the standing wave generated at, the reproduced sound pressure frequency characteristic is severely disturbed with a peak dip.

However, the sound absorbing material 2 disposed inside the acoustic tube 1 absorbs and suppresses each standing wave to produce a flat reproduced sound pressure frequency characteristic. That is, the sound absorbing material 2 plays an important role in the reproduction principle of this type of speaker device.

Further, the first reflector 5 and the second reflector 6
Is arranged so that the sound emitted from the diaphragm 9 of the speaker unit 8 and enhanced by the narrowing portion 7 of the throat is not directly absorbed by the sound absorbing material 2, and also acts on the correction in the middle range in particular. As a result, natural sound reproduction is made possible by the opening 3 of the acoustic tube 1 which is elongated and has a substantially rectangular shape.

[0010]

However, in the above-mentioned conventional structure, as shown in FIG. 3, a large amount of the sound absorbing material 2 provided to suppress the standing wave generated inside the acoustic tube 1 causes the sound waves of the middle and high frequency components to be absorbed. The first reflector 5 and the second reflector 6 are absorbed for the purpose of preventing this phenomenon.
2 is provided, it is not enough to prevent the sound pressure drop in the middle and high ranges, as indicated by the reproduced sound pressure frequency characteristic of the above-mentioned conventional speaker device in FIG. 2, and the reproduced sound pressure frequency characteristic is further disturbed. There was a problem that the characteristics of many peak dips were caused and the intelligibility of voice was lowered. Further, in order to suppress the standing wave, the sound absorbing material 2 has to be used in a large amount, which leaves a problem in terms of cost.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art by providing a speaker device having an improved acoustic clarity and an improved sound pressure, and an excellent acoustic characteristic in which a reproduced sound pressure frequency characteristic is flat. It is intended to be provided.

[0012]

In order to solve this problem, the speaker device of the present invention has an acoustic tube for guiding a sound wave having a rectangular opening, which is coupled to the front surface of the speaker, and the speaker front surface inside the acoustic tube. A pair of first reflectors arranged in the sound path from the side toward the opening of the acoustic tube, and between the first reflector and the side wall of the acoustic tube and from the starting end of the first reflector. Formed between a pair of second reflectors arranged from the front surface of the speaker so that the terminal end is located on the opening side of the tube, and between the first reflector and the second reflector and the side wall of the acoustic tube. The sound absorbing materials of different types are combined and inserted on one side or both sides of the pair of space portions.

[0013]

With this configuration, even in a speaker device having a horn or an acoustic tube whose opening is an elongated rectangular shape in consideration of incorporation into a device, the first reflector and the second reflector installed inside the acoustic tube. The sound absorbing material that is inserted in combination on one side or both sides of the space formed between the sound tube and the side wall of the acoustic tube is combined with the sound absorbing material of completely different sound absorbing characteristics, and the sound absorbing material is inserted in the optimum combination. It is possible to improve the sound pressure of 500 to 5 KHz, which is an important frequency band that constitutes voice, and it is possible to improve the intelligibility of voice, which cannot be achieved by conventional products.

In particular, by changing the size and the combination of the positions of the sound absorbing materials having completely different sound absorbing characteristics, it is possible to suppress the peak dip of the reproduced sound pressure frequency characteristics and flatten the acoustic characteristics. Moreover, the standing wave can be suppressed with a smaller amount than the amount of the sound absorbing material inserted into the conventional speaker device, and the cost can be reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan sectional view of a speaker device according to an embodiment of the present invention. In FIG. 1, reference numeral 19 denotes a speaker unit for full-band reproduction, and the speaker unit 19 for full-band reproduction has an elongated rectangular opening 14 on the front surface thereof in consideration of incorporation into a device. An acoustic tube 11 that guides a sound wave is hermetically coupled via an edge rib 21.

Inside the acoustic tube 11, the sound path 1 of sound waves radiated from the speaker unit 19 for full-band reproduction is provided.
5, the first reflection plate 16 is provided from the front side of the speaker unit 19 toward the opening 14 of the acoustic tube 11 so that the acoustic characteristics can be corrected. Between the side wall of the tube 11 and the starting end portion (speaker unit 19 side) of the first reflector 16 the acoustic tube 1
A pair of second reflectors 17 is formed from the front surface of the speaker unit 19 so that the terminal end is located on the side of the first opening 14. In addition, the gap 22 between the first reflection plate 16 and the second reflection plate 17 is a space (first reflection plate 16 and second reflection plate 16) where the first sound absorbing material 12 and the second sound absorbing material 13 are inserted. Space between the reflector 17 and the side wall of the acoustic tube 11) 2
It is for giving a distance so that it leads to 3.

Further, in order to suppress standing waves generated inside the acoustic tube 11, different types of first sound absorbing materials 12 are used.
And the second sound absorbing material 13 are combined and arranged in the space 23 in front of the second reflecting plate 17.

In the above embodiment, the first sound absorbing material 12 is an acetate fiber non-woven fabric (density 0.02 to 0.06 g / cm 3).
³ ) and the second sound absorbing material 13 was a combination of ether polyurethane foam (density 0.025 to 0.07 g / cm ³ ).

The operation of the speaker device of the present invention constructed as above will be described. First, when an input signal is applied to the speaker unit 19 for full-band reproduction, the diaphragm 20 of the speaker vibrates, and the sound wave is guided to the opening 14 of the acoustic tube through the sound path 15 inside the acoustic tube 11. However, at that time, the sound pressure of a specific frequency band is emphasized by the length of the first reflector 16 and the standing wave generated by the length of the acoustic tube 11 is suppressed by the second reflector 17. The first sound absorbing material 12 or the second sound absorbing material 13 inserted into the space portion 23 formed on the front surface, or a combination of both is absorbed, and the first reflecting plate 16 and the second reflecting plate 17 are absorbed. Disturbances in the frequency band caused by the arrangement difference between the first sound absorbing member 12 and the second sound absorbing member 12 or the second sound absorbing member 12 or the second sound absorbing member 12 in the space 22 are also provided. By absorbing with sound absorbing material 13 or a combination of both If to be able to control the intermediate and high frequency regeneration zone, it is possible to improve the sound pressure of the medium and high frequencies are important frequency band constituting the human voice.

The reproduced sound pressure frequency characteristic 24 of the speaker device according to this embodiment is shown in FIG. 2 together with the reproduced sound pressure frequency characteristic 25 of the conventional speaker device.

As can be seen from FIG. 2, by arranging different kinds of sound absorbing materials 12 and 13 having different sound absorbing characteristics in combination, the standing wave inside the acoustic tube 11 can be suppressed and at the same time, FIG. As shown in No. 24, it is possible to reduce the peak dip and to have the characteristics of high sound pressure in the mid-high range, which improves the intelligibility of voice and flattens the reproduced sound pressure frequency characteristic, which was not possible in the past. The number of sound absorbing materials 12 and 13 used can be reduced, and excellent acoustic characteristics can be realized.

Further, by incorporating the speaker device of the present invention into a television receiver, it is possible to easily realize miniaturization and slimming of the television receiver, and to provide a high-performance and high-quality television receiver. It is possible.

Needless to say, the same effect can be obtained when the speaker device constructed by the structure of the acoustic tube 11 of the present invention is provided with a rear cabinet and a bass reflex port.

[0025]

As described above, the speaker device according to the present invention can improve the sound pressure in the middle and high frequencies, which is important for reproducing human voice, and also has a flat reproduction sound pressure with few peak dips. It can have frequency characteristics, can realize excellent acoustic characteristics with improved clarity of voice that could not be realized with conventional products, and has two reflectors to combine different kinds of sound absorbing materials. As a result, the amount of resin in the acoustic tube and the amount of sound absorbing material can be reduced, and a speaker device that is superior in terms of cost can be realized.

[Brief description of drawings]

FIG. 1 is a plan sectional view showing a configuration of a speaker device according to an embodiment of the present invention.

FIG. 2 is a comparative characteristic diagram of a reproduced sound pressure frequency characteristic of the speaker device of the embodiment and a reproduced sound pressure frequency characteristic of a conventional speaker device.

FIG. 3 is a plan sectional view showing a configuration of a conventional speaker device.

FIG. 4 is a structural conceptual diagram of a television receiver including a speaker device using a conventional acoustic tube.

[Explanation of symbols]

 Reference Signs List 11 acoustic tube 12 first sound absorbing material 13 second sound absorbing material 14 opening of acoustic tube 15 sound path 16 first reflecting plate 17 second reflecting plate 18 throat narrowing section 19 speaker unit 20 speaker diaphragm 21 Edge-rising rib 22 Gap between the first reflection plate and the second reflection plate 23 Space portion 24 Reproduction sound pressure frequency characteristic of the speaker device of the present invention 25 Reproduction sound pressure frequency characteristic of the conventional speaker device

Claims (2)

[Claims] 1. An acoustic tube coupled to a front surface of a speaker for guiding a sound wave having a rectangular shape, and a pair of acoustic tubes disposed inside the acoustic tube from a front surface side of the speaker toward an opening portion of the acoustic tube. One pair from the front of the speaker so that the end of the reflector is between the first reflector and the side wall of the acoustic tube and is closer to the opening side of the acoustic tube than the beginning of the first reflector. A combination of a second reflecting plate arranged and a sound absorbing material of a different type on one side or both sides of a pair of spaces formed between the first reflecting plate and the second reflecting plate and the side wall of the acoustic tube. A speaker device that is inserted by inserting. 2. A television receiver incorporating the speaker device according to claim 1.