JPH0733096

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DESCRIPTION JPH0733096
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
headphone or earphone volume connected in the middle of a lead wire connecting an audio
device and the headphone or earphone.
[0002]
2. Description of the Related Art A conventional circuit of this type of volume is shown in FIG. In
the figure, 51 is a plug connected to the stereo type radio tape recorder side, and 3 in the figure
is a jack connected to the headphone side. The L-side audio signal a and the R-side audio signal b
introduced from the radio tape recorder side are output to the headphone side through the
changeover switch 8 and the two-unit variable resistor 9.
[0003]
When the changeover switch 8 is switched to STEREO to adjust the double variable resistor 9,
each level of the L side and R side audio signals a and b is similarly reduced by the double
variable resistor 9. As a result, the left and right volume levels output from the headphones
increase or decrease in the same balance according to the adjustment of the double variable
resistor 9.
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[0004]
On the other hand, when the changeover switch 8 is switched to SUB and the two-stage variable
resistor 9 is adjusted, the level of the R-side audio signal b becomes smaller by the two-stage
variable resistor 9, and this signal It is output to the headphone side as a side audio signal. As a
result, the sound output from the headphones becomes a monaural sound on the R side, and
becomes larger or smaller according to the adjustment of the dual variable resistor 9.
[0005]
When the changeover switch 8 is switched to MAIN / MONO, it is the same as the case of the
above-described SUB, except that the sound output from the headphones becomes monaural
sound on the L side.
[0006]
However, when it is desired to change the left and right volume output from the headphones and
listen, for example, when a person with a hearing loss listens to music, Lch enters music and Rch
enters song When it is desired to play back a tape, the conventional volume described above is
inconvenient.
The same is true when you want to practice karaoke on a CD.
[0007]
The present invention has been created under the above-mentioned background, and its object is
to provide a volume for headphones or earphones which is free from the above-mentioned
disadvantages.
[0008]
SUMMARY OF THE INVENTION A volume for headphones or earphones according to the present
invention is a volume for L-side audio signals and R-side audio signals output from audio
equipment to headphones or earphones. Dual resistor series which can be adjusted
simultaneously by the side and R side variable resistors, and L side variable resistor or R side to
make a difference between the resistance value of L side variable resistor and R side variable
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resistor It is a switch for alternately switching the function of a resistor for a balancer provided in
a variable resistor and a function of a two-piece variable resistor between balancer adjustment
and volume adjustment, and at the time of balancer adjustment, L side variable resistor or R side
While electrically connecting the variable resistor and the resistor for balancer, at the time of
volume adjustment, electrically disconnecting the L-side variable resistor or the R-side variable
resistor from the resistor for balancer It is characterized by comprising a switch.
[0009]
When the changeover switch is switched to volume adjustment, the L-side variable resistor or the
R-side variable resistor is electrically disconnected from the balancer resistance.
When the two-piece variable resistor is adjusted in this state, the levels of the L-side audio signal
and the R-side audio signal are similarly reduced by the L-side and R-side variable resistors.
As a result, the left and right volumes output from the headphones or earphones increase or
decrease in the same balance according to the adjustment of the dual variable resistor.
[0010]
On the other hand, when the changeover switch is switched to balance adjustment, the L-side
variable resistor or the R-side variable resistor and the balancer resistor are electrically
connected. When the two-stage variable resistor is adjusted in this state, the levels of the L-side
audio signal and the R-side audio signal are reduced by different amounts from each other due to
the L-side / R-side variable resistor and the balancer resistor. As a result, the left and right
volumes output from the headphones or earphones increase or decrease at different balances
according to the adjustment of the two-stage variable resistor.
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a volume
(hereinafter referred to simply as volume) for headphones or earphones according to the present
invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram of a
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volume, and FIG. 2 is an exploded perspective view of the volume.
[0012]
The volume described here by way of example is connected in the middle of a lead connecting
the stereo type small radio tape recorder as an audio device and the headphones (or earphones).
It has a structure as shown in.
[0013]
In the drawings, reference numerals 1 and 2 denote upper and lower housings, and when the
upper housing 1 is mounted on the lower housing 2 and assembled, it has a box shape as a
whole.
A terminal board on which components such as a jack 3 to which a plug (not shown) of a lead
wire on the headphone side is connected and components such as a changeover switch 6 and a
two-stage variable resistor 7 are mounted inside such housings 1 and 2 4 and the bush 52 of the
cord 5 with the plug 51 connected to the side of the radio tape recorder are respectively fixed.
[0014]
In the figure, reference numeral 61 denotes a slide knob of the changeover switch 6, and
reference numeral 71 denotes a rotary knob attached to the shaft of the two-variable resistor 7
using a screw 72. A part of either knob is a housing It is exposed from the side of 1 and 2.
[0015]
A circuit as shown in FIG. 1 is formed on the terminal plate 7.
The L-side audio signal a and the R-side audio signal b led from the radio tape recorder are input
through the TIP terminal and the RING terminal of the plug 51, and a circuit comprising the
changeover switch 6 and the dual variable resistor 7 is provided. After passing through, it is
output to the headphone side through the TIP terminal and RING terminal of the jack 3. The
SLEEVE terminals of the plug 51 and the jack 3 are common terminals for grounding.
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[0016]
The two-piece variable resistor 7 is composed of the same L-side and R-side variable resistors 73
and 74, and since it is two-piece, the variable resistance value of the L-side variable resistor 73
and R The variable resistance value of the side variable resistor 74 is always the same.
[0017]
The changeover switch 6 is a sliding switch of two circuits and three contacts.
When the slide knob 61 of this switch is moved, the function of the volume is switched to
VOLUME adjustment, BALANCE adjustment, and MUTE accordingly.
[0018]
As shown in FIG. 1, when the changeover switch 6 is in VOLUME adjustment, the TIP terminal of
the plug 51 is the L-side variable resistor 73 (the resistance between the sliding terminal and the
terminal on the jack 3 side) and the resistance The RING terminal of the plug 51 is electrically
connected to the TIP terminal of the jack 3 via a parallel circuit with R2, while the RING terminal
of the plug 51 is between the R-side variable resistor 74 (a sliding terminal and a terminal on the
resistor R4 side). It is electrically connected to the RING terminal of the jack 3 via a parallel
circuit of a resistor and a resistor R4.
[0019]
The balancer resistor R1 is provided on the R-side variable resistor 74 in order to make the
resistances of the L-side variable resistor 73 and the R-side variable resistor 74 different from
each other. Sometimes, the parallel circuit of the R-side variable resistor 74 (the resistance
between the terminal on the sliding terminal resistance R2 side) and the resistor R4 is electrically
disconnected from the balancer resistor R1.
[0020]
When the changeover switch 6 is in BALANCE adjustment, the TIP terminal of the plug 51 is
connected via a parallel circuit of an L-side variable resistor 73 (a resistance between the sliding
terminal and a terminal on the jack 3 side) and a resistor R2. Is electrically connected to the TIP
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terminal of the jack 3 while the RING terminal of the plug 51 is the RING terminal of the jack 3
via a series-parallel circuit including the R-side variable resistor 74, the resistor R4, and the
balancer resistor R1. It is electrically connected to the terminal.
That is, at the time of BALANCE adjustment, the resistor circuit of the R-side variable resistor 74
and the resistor R4 and the balancer resistor R1 are electrically connected.
[0021]
When the changeover switch 6 is MUTE, the TIP terminal of the plug 51 is electrically connected
to the TIP terminal of the jack 3 via the resistor R3, while the RING terminal of the plug 51 is
similarly via the resistor R3. Electrically connected to the RING terminal of jack 3
[0022]
The operation of the volume of the circuit configuration as described above will be described.
[0023]
First, at the time of VOLUME adjustment, the levels of the L-side and R-side audio signals a and b
are similarly reduced by the L-side and R-side variable resistors 73 and 74, the resistor R2 and
the resistor R4.
As a result, the volumes of Rch and Lch output from the headphones increase or decrease in the
same balance as the adjustment of the two-stage variable resistor 7.
FIG. 3A is a graph showing the relationship between the volume of the Rch and Lch and the
amount of rotation of the rotation knob 71 at the time of VOLUME adjustment.
[0024]
At the time of BALANCE adjustment, the L side and R side audio signals a and b are reduced by
different amounts by the L side and R side variable resistor 73, the resistor R2, the resistor R4
and the balancer resistor R1. Become.
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As a result, the left and right volumes output from the headphones increase or decrease at
different balances according to the adjustment of the two-stage variable resistor 7. FIG. 3B is a
graph showing the relationship between the volume of Rch and Lch at the time of BALANCE
adjustment and the amount of rotation of the rotary knob 71.
[0025]
At the time of MUTE, the levels of the L-side and R-side audio signals a and b are similarly
reduced by the resistor R3. As a result, the volume of Rch and Lch output from the headphones is
similarly reduced regardless of the adjustment of the two-stage variable resistor 7.
[0026]
Therefore, according to the volume of this embodiment, when switching to BALANCE adjustment,
the left and right volumes outputted from the headphones can be changed and heard, so for
example, when a person with a hearing loss listens to music, Lch It is very easy to use when you
want to play a tape containing music and Rch with songs. The same is true when you want to
practice karaoke on a CD.
[0027]
Further, when the conventional circuit shown in FIG. 4 is compared with the embodiment circuit
shown in FIG. 1, only the above-mentioned function can be obtained only by the design change to
such an extent that the balancer resistor R1, resistor R2 and resistor R3 are added. In addition,
since the function of MUTE can be added, a very large advantage can be expected in cost
reduction and performance improvement.
[0028]
Furthermore, the sound pressure ratio, which is the ratio of the maximum volume to the
minimum volume, can be easily changed by changing the resistances of the balancer resistor R1,
the resistor R2 and the resistor R3.
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Further, since the resistor R2 and the resistor R3 are added to the balancer resistor R1 in
addition to the resistor R1, there is an advantage that the effects of the balancer and the volume
can be used properly by switching the changeover switch 6.
[0029]
The balancer resistor R1 may be provided on the L-side variable resistor 73 side, or may be
directly connected to the lead on the headphone side without using the jack 3. Absent.
[0030]
As described above, in the case of the volume for headphones or earphones according to the
present invention, if the changeover switch is switched to BALANCE adjustment, it is possible to
change and listen to the left and right volume output from the headphones. , When a person with
a hearing loss listens to music, Lch to music, Rch to play a tape containing a song, to practice
karaoke with CD, there is a merit that it is very easy to use.
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