JPS62250798A - Acoustic reproducing device - Google Patents

Abstract

PURPOSE:To give sufficient at-site feeling of sound without causing any noise by providing a loudspeaker unit to which low frequency components are supplied and a cavity in close contact with the parts of human body other than the head. CONSTITUTION:In the approximate central part of a seat back of a chair, the loudspeaker unit 3 to reproduce a signal of low frequencies is provided. On the sound propagating side, a loudspeaker 4, a packing 8, and the back of a user 7 jointly form a front cavity 6. Particularly since the packing 8 is allowed to be in close contact with the user 7 by making the front cavity 6 a completely closed chamber, lower resonance frequency f0 and the sound pres sure of reproduced sound of lower frequencies rise. A signal from a signal source 10 to the loudspeaker unit 3 is supplied to a pre-main amplifier 11, and L-side and R-side signals are conducted to output terminals 12 and 13 respective ly. These signals from the terminals 12 and 13 are supplied to the loudspeaker installed in front of the user 7. A signal amplified by a power amplifier 16 is supplied to the input terminal of the loudspeaker 4 of the loudspeaker unit 3. The loudspeaker 4 is driven by low-frequency signals, and thus made sound pressure work on the back of the user 7 siting on a chair.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sound reproduction device used for improving low frequency reproduction characteristics.

[Summary of the invention]

The present invention provides a speaker unit to which a low frequency component of a signal from a signal source is supplied in a sound reproduction device;
A cavity that is installed on the sound emitting side of the speaker unit and forms a closed space by closely contacting parts of the human body other than the head during playback, so that low-frequency components can be experienced in parts of the human body other than the head. This allows the listener to fully enjoy the sense of being there.

[Conventional technology]

Conventional speakers are inertial-controlled and have a low resonant frequency. Therefore, the bass reproduction limit is defined. Therefore, if you try to lower the bass reproduction limit to obtain deep bass with a sufficient output level, The speaker system will either be extremely large or have extremely low sensitivity.However, if you try to get the same bass feel as a live performance using a very large speaker system, noise problems will occur. , there are practical problems.

Furthermore, although headphones are advantageous in reproducing bass sounds, they reduce noise, but do not provide a sufficient sense of realism because the sound is not transmitted to the human body outside the ears.

In order to compensate for the insufficiency of low frequency reproduction by such speakers, vibrations are generated by the low frequency components of the reproduced sound, and these vibrations are transmitted to the listener.
Sound reproduction devices that attempt to obtain a sense of place have been proposed as prior art.

Examples of acoustic transducers that transmit this vibration to the listener are those described in Japanese Patent Publication No. 52-3281 and Japanese Patent Publication No. 53-44818.

First, in Japanese Patent Publication No. 52-3281, the vibration axis of the vibrator is directly connected to the human body with the aim of directly transmitting vibration to the human body through construction materials so as to provide a sense of presence similar to that of a live performance. Most of the weight of the vibrator is held by the vibration shaft when attached to the construction material of the human body object, and at the same time as the acoustic device is driven to reproduce, the vibration generated by the signal of the appropriate frequency reproduced by the device is directly generated. It is disclosed that music is transmitted through materials and music can be appreciated through a synergistic effect between the two.

Further, Japanese Patent Publication No. 53-44818 describes a sound reproduction system that effectively combines music heard with the ears and special vibrations that confuse the body. This sound reproduction method adds the output signal of the sound reproduction device to a speaker and reproduces the sound, and also seals some of the low frequency components of the output signal to a structure such as a chair or bed that the listener's body is in direct contact with. A drive unit provided through the space applies power to provide a low frequency signal to the listener.

[Problem that the invention seeks to solve]

However, the chair is in direct contact with the listener's body.

In these prior art technologies, low-frequency vibrations are transmitted from a drive unit to a listener through a closed space in a structure such as a bed, and the low-frequency vibrations are transmitted through structural members such as chairs and beds, creating a sense of realism. There was room for further improvement.

An object of the present invention is to provide a sound reproducing device that is capable of reproducing up to ultra-low frequencies and that provides a sufficient sense of presence without emitting noise to the surroundings.

[Means for solving problems]

This invention includes a speaker unit to which a low frequency component of a signal from a signal source is supplied, and a speaker unit that is provided on the sound emitting surface side of the speaker unit, and that is placed in close contact with a part of the human body other than the head during playback to create a closed space. and a cavity to be formed.

[Effect]

According to this invention, the sound pressure from the diaphragm of the speaker unit to which the low frequency component of the signal from the signal source is supplied is directly transmitted to the listener, and the reproduced sound is reproduced with a sense of presence closer to that of a live performance. You can enjoy it.

〔Example〕

An embodiment of the invention will be described with reference to FIGS. 1 to 3.

In FIG. 3, reference numeral 1 denotes a chair, and approximately in the center of the backrest 2 of this chair 1, there is a speaker device 3 for reproducing, for example, 20 (H1z or lower) low frequency signals of the signals from the signal source. This speaker device 3 is provided with a speaker 4 as shown in FIG. 1, and a rear cavity 5 is formed at the rear of the speaker 4.

Further, a backing 8 is provided on the front surface of the outer edge of the spill force device 3 on the sound emitting surface side of the speaker from which sound waves are emitted. Speaker 4 is on the sound emitting side. A front cavity 6 is formed between the backing 8 and the back of the listener 7, and the backing 8 is brought into close contact with the listener 7, making the front cavity 6 a completely closed space, increasing the low-frequency resonance frequency f0. However, the sound pressure of low-frequency reproduced sounds also increases.

A signal from a signal source IO to this speaker device 3 is supplied to the integrated amplifier 11, and L side and R side signals are led out to output terminals 12.13. Signals from these terminals 12 and 13 are supplied to a speaker (not shown) installed in front of the listener. Further, one output signal, for example, on the R side, is taken out from the headphone terminal and supplied to the low-pass filter 14. From this low-pass filter 14, for example, 200
Signals below Hz are extracted, and this low-pass filter 1
4 output signals are supplied to the volume 15.

The output level is adjusted by the volume 15, the signal from the volume 15 is supplied to a power amplifier 16, and the signal amplified by the power amplifier 16 is supplied to the input terminal of the speaker 4 of the speaker device 3 described above. The speaker 4 is driven by a low-frequency signal, and sound pressure is applied to the back of the listener who is sitting on the chair l. By experiencing this sound pressure, the listener can enjoy the music with a sense of realism as if they were at a rock concert venue.

Sound pressure from the speaker 4 is transmitted to the listener 7 from a front cavity 6 formed by the diaphragm on the sound emitting side of the speaker 4, the back of the listener 7, and the backing 8. As shown in FIG. 2, the frequency versus sound pressure characteristic of a signal below the resonance frequency f0 is, for example, 130 to 140 dB. In addition, since the front cavity 6 is formed and a sealed space is formed during playback, there is less loss in sound transmission, and the human body can directly experience the ultra-low range with high sound pressure, and theoretically there is no limit to low-range playback. You can get playback sound. If there is a loss such as air leakage in the front cavity, the sound pressure will decrease in the low range as shown by the dotted line in Figure 2, so the front cavity 6 formed by the listener and the backing 8 will be sealed. It is preferable to maintain sufficient quality.

Note that when the headphones are used, a signal to be supplied to the speaker device 3 may be obtained from an unused speaker terminal, and the rear cavity 5 does not need to be a closed space.

Further, FIG. 4 shows another embodiment of the present invention.

In this embodiment, a bass speaker is embedded in a chair cushion so that the user can experience deep bass sounds.

In FIG. 4, 20 indicates a chair, and a cushion 21 is placed on the backrest of this chair 20, and a bass speaker 2 is placed in a cylindrical recess 21a in the center of this cushion 21.
2 is provided. This bass speaker 22 has an edge 22
a is embedded and fixed in the cushion. An annular backing 24 is provided on the edge of the sound emitting surface of the bass speaker 22 so as to be brought into close contact with the listener 7 to prevent sound from leaking outside. When the listener 7 sits on the chair 21, a part of the back comes into contact with the annular backing 24, and a front cavity is formed by the part of the back, the backing 24, and the diaphragm of the bass speaker 22. The sound pressure from the diaphragm is transmitted to your back through the space, allowing you to experience deep bass.

Since this bass sound is experienced along with the reproduced sound obtained from an external speaker device or headphone device, it is possible to enjoy a sense of presence close to that of a live performance.

FIG. 5 shows yet another embodiment of the invention.

In this example, two bass speakers 31 and 32 are provided on a band 30 that is worn around the listener's abdomen.

When this band 30 is wrapped around the abdomen, the sound emitting surface side of the bass speakers 31 and 32 is
A closed space is formed between the sound emitting surface side of the speaker and the abdomen, and the sound pressure emitted from the sound emitting surface side of the bass speakers 31 and 32 is felt in the abdomen.

The user can experience the low-frequency reproduction sound from the bass speakers 31 and 32 provided in the band together with the sound from the speakers or headphones (not shown), thereby making it possible to reproduce music with a sense of realism.

FIG. 6 shows still another embodiment of the invention.

In this embodiment, a box-shaped bass speaker device is connected by two narrow parallel bands to form a belt as a whole.

In this FIG. 6, reference numerals 41, 42, 43, and 44 indicate bass speaker devices each having a box-shaped front cavity. Speakers 41a, 42a, 43
a, 44a are provided, and these bass speakers 41a, 4
2a, 43a.

Backings 41b and 42b are provided on the sound emitting surface side of 44a.

43b and 44b are provided. When the belt is fastened, banking 41b, 42 may be applied to the listener's abdomen or waist.
b, 43b, 44b are in contact with the listener and backing 4
1b, 42b, 43b, 44b speakers 41a, 42a
, 43a, and the sound emitting surface side of 44a form a sealed space,
You can experience deep bass through your experience.

The bass speaker devices 41, 42, 43, 44 are connected by parallel belts 45, 46 made of resin and attached to the abdomen or waist.

The sound pressure of bass components emitted from the sound emitting surfaces of the speakers 41a, 42a, 43a, and 44a is directly transmitted to the abdomen or lower back via this closed space.

The belt-type embodiment of FIG. 6 is suitable for use with headphones.

〔Effect of the invention〕

According to this invention, the listener can directly experience the sound pressure from the sound emitting surface side of the bass speaker unit, so there is no noise problem and the listener can enjoy the reproduced sound up to the ultra-low range using a small device. This enables sound reproduction with a rich sense of presence.

[Brief explanation of drawings]

FIG. 1 is a route map showing an example of the main parts of an embodiment of the present invention;
Fig. 2 is a route map showing the frequency characteristics of an embodiment of the present invention, Fig. 3 is a route map showing the overall configuration of an embodiment of the invention, and Fig. 4 is a cross section showing another embodiment of the invention. 5 is a route map showing still another embodiment of the invention, and FIG. 6 is a perspective view showing still another embodiment of the invention. Explanation of main symbols in the drawings 1: Chair, 3: Speaker device, 4: Speaker, 6: Front cavity, 7: Listener, 8: Packing. Agent Patent Attorney Tadashi Sugiura Chispi V-fold! Figure 1 Figure 2 Ite = 1? Voice of God Iku 1 Figure 5 jiiiia

Claims (1)

[Claims] A speaker unit to which low frequency components of the signal from the signal source are supplied, and a cavity provided on the sound emitting surface side of the speaker unit and which forms a closed space by coming into close contact with a part of the human body other than the head during reproduction. A sound reproduction device comprising: