JPH0543424U - Cable for multi-channel stereo equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a cable that is less susceptible to noise. A cable for a multi-channel stereo device having at least two channels consisting of two cores per channel, in which the cables for each channel are twisted together. Therefore, the cables are twisted with each other and the cable is divided into small loops, so that the noise current is canceled and the deterioration of the audio signal is prevented.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cable for a stereo device, and particularly to a cable that is less susceptible to external noise.

[0002]

[Prior Art]

 In recent years, digital devices have come to be used for audio devices, and so-called sound field control has been put into practical use. Such a system requires the transmission of a sound effect signal in addition to the main signal, so that it is inevitably multi-channel and a plurality of two-core cables are used.

FIG. 3 is a connection diagram between an amplifier and a speaker which have been conventionally used. That is, the output amplifiers 3011 and 3012 in the amplifier 301 are generally so-called unbalanced amplifiers, and the ground is common to all channels. Therefore, the impedance on the hot side and the impedance on the ground side are not the same.

[0004]

[Problems to be solved by the device]

 Therefore, the hot side cables 3031 and 3032 connecting the output amplifiers 3011 and 3012 to the speakers 3021 and 3022 and the ground side cables 3041 and 3042 connecting the ground and the speaker are not the same in impedance.

Therefore, the two-core cable simultaneously operates as an antenna, and the induced voltage flows through the cable as a noise current due to the difference in impedance between the hot side cable and the ground side cable and deteriorates the quality of the audio signal. Especially in audio systems installed in automobiles, noise generated from distributors is likely to be mixed.

The present invention has been made in view of the above problems, and an object thereof is to provide a cable in which noise is unlikely to be mixed.

[0007]

[Means for Solving the Problems]

 It is a cable for a multi-channel stereo device having at least two channels consisting of two cores per channel, and the cables for each channel are twisted together.

[0008]

[Action]

 In the multi-channel stereo cable according to the present invention, the cables for each channel are twisted together and divided into small loops, so that noise current is canceled and deterioration of the audio signal is prevented.

[0009]

【Example】

 FIG. 1 is a perspective view of a multi-channel stereo cable according to the present invention, showing a 2-channel cable. Connection jacks 102R and 102L are connected to the ends of the cables 101R and 101L.

The connection jacks 102R and 102L have center pins 103R and 103L and outer pins 104R and 104L, respectively, and are insulated from each other by an insulator. Normally, the hot side signal line is connected to the center pins 103R and 103L, and the earth side signal line is connected to the outer pins 104R and 104L.

The two signal lines 101 R and 101 L are twisted with each other, and the outside of the two twisted signal lines is covered with a sheath 105. FIG. 2 is a partially enlarged view of two cables twisted together. In other words, when viewed as an equivalent circuit of noise current, the two twisted cables can be considered to have small loops connected in series.

Therefore, the current induced in the cables 101R and 101L by the external noise is consumed in the loop and the influence on the acoustic signal can be reduced.

[0013]

[Effect of the device]

 In the multi-channel stereo cable according to the present invention, two or more cables are twisted together to form a small loop as an equivalent circuit of noise. Therefore, the induced noise current is consumed in the small loop, suppressing the deterioration of the audio signal and enabling high-quality reproduction.

[Brief description of drawings]

FIG. 1 is a perspective view of a multi-channel stereo cable according to the present invention.

FIG. 2 is an enlarged view of a part of two cables twisted together.

FIG. 3 is a connection diagram between an amplifier and a speaker which have been conventionally used.

[Explanation of symbols]

 101R, 101L ... Cable 102R, 102L ... Connection jack 103R, 103L ... Center pin 104R, 104L ... Outer pin 105 ... Sheath

Claims (1)

[Scope of utility model registration request] 1. A cable for a multi-channel stereo device having at least two channels each having two cores per channel, wherein the cables for each channel are twisted together.