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JPH05344598

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH05344598
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
circuit arrangement for the adjustment of the output signal of a multi-channel electro-acoustic
device, which comprises an output amplifier and an electro-acoustic transducer for each channel
and the like. It consists of circuit elements and derives the mutual effects between the output
signals of different channels.
[0002]
BACKGROUND OF THE INVENTION Circuit arrangements of this type are described in DE-PS
737,121 which is identical to U.S. Pat. Nos. 24,81,911 and 39,24,072. In this prior art, the
adjustment of the output signal is to allow other stereo signals to be added to one stereo channel
to a different extent in order to actually suppress the stereo effect to a greater or lesser extent. .
In this case, however, the variability of the acoustic impression is limited as the phases of the
individual signals contained in all the signals are not evaluated and influenced.
[0003]
SUMMARY OF THE INVENTION The object of the present invention is to design a circuit
arrangement of the type described above, so that the stereophonic experience can be varied
rather than in the way known in the prior art.
08-05-2019
1
[0004]
SUMMARY OF THE INVENTION According to the invention, the corresponding coupling
terminals of an electrical-acoustic transducer of one polarity are connected according to the
invention to the points of the circuit carrying the output signals of the output amplifiers of the
various channels and others This is achieved by the fact that the corresponding connection
terminals of the polarity are led together and connected to earth by means of a potentiometer.
[0005]
With the circuit arrangement according to the invention, the phases of the signals appearing at
the electro-acoustic transducers belonging to the various channels can be adjusted infinitely over
a wide range.
In contrast to the prior art it becomes possible to adjust the stereo angles and spatial distribution
of different sound sources (musical instruments and singers), ie by subjective desires.
The mono signal added to the multichannel full signal can be pushed back to a significant extent
without the signal also losing the features of the multichannel and its dynamics.
[0006]
The circuit arrangement of the present invention may be included in an additional device, which
can be connected between the output terminals of conventionally available commercially
available electro-acoustic devices and the corresponding input terminals of the associated
electro-acoustic transducers. . In this connection, an "adapter" type is conceivable, which can be
connected between the stereo device and the headphones or even the loudspeaker unit. As a
variant, the circuit arrangement according to the invention can furthermore be integrated in a
fixed manner in the electro-acoustic device. The potentiometer according to the invention then
has the same important functions as a volume controller, a balance, a high bass controller as a
tuning element.
[0007]
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2
Since the adjustment of the potentiometer provided by the invention involves a change of
dynamics, an improvement of the circuit arrangement of the invention is recommended, in which
other potentiometers are connected respectively to the coupling terminals to the corresponding
output amplifier of one polarity. Arranged, of which the pick-off of the potentiometer is placed on
the same axis of rotation as the pick-off of the potentiometer, whereby the corresponding
coupling terminal of the other polarity is connected to earth, However, the resistance value of
this other potentiometer changes in the opposite direction of the resistance value of the
potentiometer described in claim 1. In this configuration, the adjustment of the stereophonic
sound experience with it will otherwise be required for another potentiometer, but the change in
dynamics is automatically compensated.
[0008]
Embodiments of the invention will now be described in detail in connection with the drawings.
FIG. 1 schematically shows the circuit arrangement of the additional device, which is connected
between the headphone connection of the stereo device and the headphones. FIG. 2
schematically shows the corresponding circuitry for operating the two loudspeakers of the stereo
device, which may optionally be integrated into the stereo device or designed as an adapter. FIG.
3 illustrates the adjustment of the circuit configuration of FIG. FIG. 4 contains a schematic
diagram of the additional device, the circuit configuration of which is shown in FIGS.
[0009]
The circuit configuration shown in FIG. 1 is primarily intended for additional devices as
schematically depicted in FIGS. 4A and 4B. That is, the circuitry itself is placed in the small box 1
and then the lead 2 leads to the plug 3 which is connected to the existing headphone connection
of the stereo device. The cable 20 connected to the small box 1 by the plug connection terminal
4 leads to the headphone 6. The stereo sound experience can be changed by rotating the
operation knob 7.
[0010]
The embodiment of the additional device shown in FIG. 4B is completely identical to that of FIG.
4A except that the slide controller 7A is provided instead of the rotary knob 7. The circuit
arranged in the small box 1 is the simplest and the first embodiment is shown in FIG. The input
08-05-2019
3
terminal 3A which is part of the plug 3 and is connected from the back to the output amplifier of
the left stereo channel of the stereo device is directly connected to the positive connection
terminal 4A of the left headphone earpiece 6A.
[0011]
Terminal 3B is connected in a manner corresponding to the output amplifier of the right stereo
channel of the stereo device and is directly connected to the positive connection terminal 4B of
the right headphone earpiece 6B. The negative connection terminals 4C and 4D of the
headphone earpieces 6A and 6B are interconnected and connected through the potentiometer 7
to the terminal 3C of the plug 3, which is connected to the earth of the stereo device.
[0012]
By adjusting the potentiometer 7, the phase position of the signal provided to the headphone
earpiece, ie the stereo sound experience, can be changed in a manner different from that
conventionally known. The resistance value adjusted by the potentiometer 7 is continuously
changed between 0 ohm and "infinity" (in fact, a relatively high value). If this resistance is equal
to zero, then an independent current flows from the output stage amplifier of the stereo device
through the terminals of the headphone earpiece 6A or 6B and the terminal 3C of the plug 3 and
the terminal 3C. This corresponds to the normal way of operation of the stereo device, where the
right and left channels have no influence on one another.
[0013]
However, if the resistance of the potentiometer is increased by rotating the knob depicted in FIG.
4A or by sliding the slide controller 7A of FIG. 4B, then the stereo signal appearing at terminals
3A and 3B will be Interact in an innovative and indeed signal-dependent manner. By changing
the value of the potentiometer 7, the voltage effectively appearing on the headphone earpieces
6A and 6B can be changed infinitely. This allows the dynamics, the position of the instrument at
the angle to be heard, the stereo impression, the low volume and also the volume of eg the singer
to be changed within wide limits. For example, it is possible to change the singer's voice added to
the stereo music signal as a mono signal, so that the combined music hardly changes as a 70 to
80% dynamics stereo signal. However the dynamics of the singer's voice is reduced to 90% so
that it is only heard in the background as almost individual echoes.
08-05-2019
4
[0014]
The circuit configuration depicted in FIG. 2 is in agreement with the embodiment described
above in connection with FIG. 1 with a few exceptions mentioned hereinafter. The corresponding
parts are therefore given the same reference number plus 100. The terminals 103A, 103B and
103C are in this case attached to the output amplifier of the stereo device and should be
considered as the inside of its casing. The left loudspeaker 106A and the right loudspeaker 106B
are used as electro-acoustic transducers. The negative connection 104 of loudspeaker 106A is in
this case the same as circuit point 103A, which is connected to the output of the output amplifier
for the left stereo channel. Similarly, the negative connection terminal 104B = 103B of the right
side loudspeaker 106B is connected to the output of the output amplifier for the right stereo
channel.
[0015]
The positive connection terminals 104C and 104D of the corresponding loudspeakers 106A and
106B are interconnected and connected to the potentiometer 107 which is to be considered
inside the stereo device. The other end of potentiometer 107 is connected to point 103C of the
stereo device's internal circuitry, which is connected to ground. The method of operation of the
embodiment depicted in FIG. 2 corresponds essentially to that of the embodiment of FIG.
[0016]
If an absolute mono signal appears at terminals 3A, 3B or 103A, 103B of the circuit arrangement
according to FIGS. 1 and 2, then potentiometer 7 or 107 functions as a volume control member if
possible. Have. As already mentioned above, according to the adjustment of the values of the
potentiometers 7 and 107, the change of the phase position is not all. In addition, some changes
occur in the dynamics of the signal appearing at the electro-acoustic transducers 6 and 106. This
change in dynamics can in principle basically be compensated by the volume controller present
in each stereo device. However, as shown in the example depicted in FIG. 3, it is more convenient
to automatically compensate for this change in dynamics. This embodiment is a simple
adjustment of the circuit configuration depicted in FIG. Thus, the corresponding parts are
characterized by adding 200 to the same reference numbers.
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[0017]
Also in FIG. 3, a headhorn having a left headphone earpiece 206A and a right headphone
earpiece 206B is used as an electro-acoustic transducer. The positive connection terminal 204A
of the left headphone earpiece 206A is the terminal 203A of the plug 203 which in turn
transmits the left stereo signal of the stereo device through another potentiometer 208 which
should be considered as in the small box 1 of the additional device (see FIG. 4). Connected to The
potentiometer 208 is connected in the opposite direction of the potentiometer 207, ie, in the
case of rotation in the same direction, the resistance values of the potentiometers 208 and 207
change in the opposite direction.
[0018]
Similarly, the positive connection terminal 204B of the right headphone earpiece 206B is
connected through the potentiometer 209 to the terminal 203B of the plug 203 which carries
the right stereo signal of the stereo device. The negative connection terminals 204C and 204D of
the headphone earpieces 206A and 206B are again interconnected and connected through the
potentiometer 207 to the terminal 203C of the plug 203 which is connected to ground. The
potentiometers 207, 208 and 209 are placed on a common axis and adjusted in tandem. In this
way, when rotating the common axis at an angle, the values of resistances 208 and 209 are
increased or decreased by the amount needed to equalize the dynamic change provided by
potentiometer 207.
[0019]
With the circuit arrangement according to the invention, the phases of the signals appearing at
the electro-acoustic transducers belonging to the various channels can be adjusted infinitely over
a wide range. In contrast to the prior art it becomes possible to adjust the stereo angles and
spatial distribution of different sound sources (musical instruments and singers), ie by subjective
desires. The mono signal added to the multichannel full signal can be pushed back to a
significant degree without the signal further losing the characteristics of the multichannel and its
dynamics.
[0020]
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6
Also, the circuit arrangement of the present invention may be included in an additional device,
which is conventionally between the output terminal of a commercially available electro-acoustic
device and the corresponding input terminal of the associated electro-acoustic transducer. It is
connectable. In this connection, an "adapter" type is conceivable, which can be connected
between the stereo device and the headphones or further the loudspeaker unit, or alternatively,
the circuit arrangement according to the invention can be integrated further in an electroacoustic device in a fixed manner. The potentiometer according to the invention then has the
same important functions as a volume controller, a balance, a high bass controller as a tuning
element. Furthermore, since the tuning of the potentiometer provided by the present invention
involves certain changes in dynamics, improvements in the circuit configuration of the present
invention are recommended and changes in dynamics are automatically compensated.
08-05-2019
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