JP2004220797A - Aluminum cable for audio - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cable for audio with a clear source of playback sound, distinct sound with a high SN ratio, and with reverberation and resonance close to the original sound. <P>SOLUTION: The cable for the audio is of a single-core structure with a core material made of aluminum thick wire 1b, and is provided with gaps made of air layers 6, 7 between the core material and an insulation body 2 and between the insulation body and a tube shield 5, respectively. As compared with a conventional audio cable, it has a dramatically improved sound quality with a clear source of playback sound, a distinct sound with a high SN ratio, and reverberation and resonance of the sound closer to the original sound. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

表１より明かなように、人間の聴覚で感じる音質としては、本発明のケーブルの方が格段に優れている。
【００１３】
次に、オシロスコープを用いて上記応用例及び比較例記載のオーディオシステムによる再生音の波形の比較を行なった。
オシロスコープの端子をアンプのスピーカー出力端子に接続し、５５Ｈｚの低周波の音とそれより高い１５６Ｈｚの音を録音したＣＤをＣＤプレイヤーで再生し、それぞれの音の波形をオシロスコープで計測した。計測結果を図４ａ及び図４ｂに示す。
図４ａ及び図４ｂから明らかなように、５５Ｈｚの音及び１５６Ｈｚの音の双方について本発明のオーディオ用ケーブルの方が市販のオーディオケーブルよりもノイズが低い。つまり、再生音のＳＮ比が高く、クリアな音が得られている。
【００１４】
【発明の効果】
以上説明したように、本発明によれば、従来のオーディオケーブルに比し、再生音の音源が明確になり、音が明瞭でＳＮ比が高く、音の余韻と響きが原音により近くなるなど、音質が飛躍的に向上するという効果がある。
【図面の簡単な説明】
【図１】従来からの一般的なオーディオ用ケーブルの断面図である。
【図２】本発明のオーディオ用ケーブルの断面図である。
【図３】応用例及び比較例で使用したオーディオシステムの構成図である。
【図４】応用例及び比較例で使用したオーディオシステムで５５Ｈｚの音を再生した場合のオシロスコープによる波形図である。
【図５】応用例及び比較例で使用したオーディオシステムで１５６Ｈｚの音を再生した場合のオシロスコープによる波形図である。
【符号の説明】
１ａ：芯線（導体）
１ｂ：芯線（アルミニウム単芯導体）
２：絶縁体
３：緩衝材
４：金属箔シールド
５：チューブシールド
６，７：間隙（空気層）
８：ＣＤプレイヤー
９：アンプ
１０ａ，１０ｂ：スピーカー
１１ａ，１１ｂ：スピーカーケーブル
１２：ＲＣＡケーブル
１３：ＣＤプレイヤーの電源ケーブル
１４：アンプの電源ケーブル[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an audio cable in which aluminum is used as a core material.
[0002]
[Prior art]
A cable used for audio has conventionally used copper as a core material, and among them, a copper material containing no impurities such as oxygen-free copper has been favorably used as a material for improving sound quality.
In a generally used audio cable, as shown in FIG. 1, the surface of a core wire 1a made of a conductor such as copper is directly covered with an insulator 2. The core wire 1a may be a single thick wire, but usually, a large number of thin wires are twisted as shown in the figure. A buffer material 3 is arranged on the outside of the insulator 2 in the radial direction, and a metal foil shield 4 is arranged on the outside, and a tube shield 5 is arranged on the outside of the cushioning material 3. The material of the cushioning material 3 is silk or the like, and the material of the metal foil shield 4 is usually copper.
In an audio system, in order to faithfully reproduce an original sound, it is important to smoothly supply a current serving as a sound signal and remove the influence of noise as much as possible. For this reason, the structure is not limited to the purity of the copper material, the core wire 1a is covered with the insulating material 2 as shown in FIG. Had become. However, even if such an expensive cable is used as an audio cable, the reverberation and resound of the sound that can be obtained during live performance of the musical instrument are not sufficiently obtained, and it has not reached the level of the original sound reproduction. Is the current situation.
[0003]
[Problems to be solved by the invention]
According to the prior art as described above, when a copper or gold cable is used, the clarity, strength, and sound of the sound heard from the speaker are obtained despite the use of a structurally complicated and expensive cable. However, there is a problem that the depth, lingering sound and the like are not sufficiently satisfactory in proportion to the price.
[0004]
[Means for Solving the Problems]
The current that is a sound signal is transmitted by free electrons flowing through the core material. It is presumed that free electrons flow through a single-core thick strand of wire without resistance and transmit sound signals more easily than flow through a single strand of core material where thin wires are gathered. Also, considering that sound information is a wave transmitted through the core, it is better to vibrate freely instead of directly covering the surface of the core with an insulating material and transmitting it without losing the amount of sound information. Think.
From these facts, in the present invention, the structure of the cable is not a stranded wire composed of a large number of fine wires but a single core structure composed of one thick wire. Is provided so that the core material can freely vibrate. Also, as the core material, copper having good electric and thermal conductivity has been conventionally used, but since copper has high inertia due to its high density, aluminum having good electric conductivity and low density is selected. did.
[0005]
As the aluminum core wire, an aluminum wire that has just been processed into a wire or an aluminum wire that has been subjected to a surface treatment, such as an alumite treatment, is used.
[0006]
The gap width of the gap formed by the air layer is not preferable because it is not substantially different from that obtained by directly covering the surface of the core wire if it is about 0.1 mm or less, but can be arbitrarily set if it is larger than about 0.1 mm. However, since it does not contribute to the improvement of the sound quality even if it is widened too much, about 0.5 to 2.0 mm is practically preferable.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
【Example】
An embodiment of the present invention will be described with reference to FIG. FIG. 2 is a sectional view of the audio aluminum cable of the present embodiment.
As shown in this figure, in the cable of this embodiment, a core wire 1b made of a single 1.5 mm thick aluminum wire was used as a conductor. In addition, the thing of purity 99.7% was used for aluminum of the wire.
The core wire 1b is covered with the insulator 2, but instead of directly covering the surface of the core wire 1b as usual, the inner diameter of the insulator 2 is set to 2.5 mm and an air space is formed between the core wire 1b and the core wire 1b. Gap 6 is provided. The outer diameter of the insulator 2 was 3.0 mm. Further, the inner diameter of the tube shield 5 was set to 7.0 mm, and a gap 7 made of an air layer was provided between the insulator 2 and the tube shield 5. The outer diameter of the tube shield 5 was 10.0 mm.
[0008]
Compared with the conventional cable, the audio cable according to the present embodiment has a clear sound source of the instrument and a high SN ratio for the sound generated from the speaker at the time of player reproduction, and the resolution, localization, strength, weakness, reverberation, and sound of the sound are remarkably original sound. Close to.
[0009]
[Application example]
Using the audio cable (cable described in the embodiment) of the present invention, each device of the CD player 8, the amplifier 9, the left speaker 10a, and the right speaker 10b as shown in FIG. Thus, an audio system composed of cables 11a, 11b, 12, 13, and 14 for connecting the power supply and the power supply was constructed. Among the cables, the RCA cable 12 for connecting the player 8 and the amplifier 9 and the power cables 13 and 14 for connecting the player 8 and the amplifier 9 to the power supply were the cables described in Example 1. The length of each of the RCA cable 12 and the power cables 13 and 14 was 1 m.
[0010]
[Comparative example]
For comparison, a system having the same configuration as that of the above-mentioned application example was configured except that a commercially available audio cable (gold prize winner) was used.
[0011]
Comparative tests were performed using the audio systems described in the application examples and the comparative examples.
The distance between the left and right speakers was 2 m, and the listening was performed at a position 3 m from the speakers.
As indices for comparing the sound quality of the reproduced sound, clarity, strength, sound, sound, depth, and lingering sound were selected, and evaluated on a three-point scale of good 2 points, normal 1 point, and bad 0 point.
The audition was conducted by five people who have music as a hobby and are in contact with music every day.
Table 1 shows the results of the comparison.
[0012]
[Table 1]

As is clear from Table 1, the cable of the present invention is much more excellent in the sound quality perceived by human hearing.
[0013]
Next, using an oscilloscope, waveforms of reproduced sounds by the audio systems described in the application example and the comparative example were compared.
The terminal of the oscilloscope was connected to the speaker output terminal of the amplifier, and a CD in which a low-frequency sound of 55 Hz and a higher sound of 156 Hz were recorded was reproduced by a CD player, and the waveform of each sound was measured with an oscilloscope. The measurement results are shown in FIGS. 4a and 4b.
As is apparent from FIGS. 4a and 4b, the audio cable of the present invention has lower noise than the commercially available audio cable for both the 55 Hz sound and the 156 Hz sound. That is, the SN ratio of the reproduced sound is high, and a clear sound is obtained.
[0014]
【The invention's effect】
As described above, according to the present invention, the sound source of the reproduced sound is clearer than the conventional audio cable, the sound is clearer, the SN ratio is higher, the reverberation and sound of the sound are closer to the original sound, and the like. This has the effect of dramatically improving the sound quality.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a conventional general audio cable.
FIG. 2 is a sectional view of the audio cable of the present invention.
FIG. 3 is a configuration diagram of an audio system used in an application example and a comparative example.
FIG. 4 is a waveform diagram of an oscilloscope when a sound of 55 Hz is reproduced by the audio system used in the application example and the comparative example.
FIG. 5 is a waveform diagram of an oscilloscope when a sound of 156 Hz is reproduced by the audio system used in the application example and the comparative example.
[Explanation of symbols]
1a: core wire (conductor)
1b: core wire (aluminum single core conductor)
2: Insulator 3: Buffer material 4: Metal foil shield 5: Tube shield 6, 7: Gap (air layer)
8: CD player 9: amplifiers 10a, 10b: speakers 11a, 11b: speaker cable 12: RCA cable 13: power cable of CD player 14: power cable of amplifier

Claims (1)

In an audio cable in which the core material of the core wire is aluminum or anodized aluminum, the structure of the core wire is a single core structure, and a gap formed by an air layer is provided between the core wire and an insulator surrounding the core wire. Characteristic audio cable.

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