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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of
the present invention, and FIG. 2 is a circuit diagram showing -IJ of a preamplifier. 1---1-1st
system preamp, 2- ... 2nd system preamp, 3- 1 1 1 3rd system preamp, 4 ... 4th system preamp, T
~ и и Human power terminal, 8- и и и 1 human power terminal, 9 и и и и output terminal, 10-и и output
terminal, 15-и one transistor, 16 и R, 34-и и и resistance , 35---resistance, 36----resistance. (1)
Japanese Utility Model Application 47-11201 (2) ?
[Detailed Description of the Invention] (1) Yanoneru II! It is about the analog 4 channel 9 circuit
of the vessel. Usually, Fi has a four-channel amplifier, has four amplification systems for Sound
North for four channels independently, and distributes four speakers at the front left, right, rear,
left and right of the listener. Three-dimensional sound-sound is generated, but in such a 4channel "-17-channel amplifier, in the case of 2-channel sound north, only the left side and right
side speakers are separated. There is no difference between the two, there is no sense of realism
in four channels while one is stunned, while the record for the current and seven channels and
the one and two channels of the sound north seven, the tape rod is pressed coppery Things for
11 more and 4 channels in the future will increase to 1 and will be present, and even if only
amplification equipment is for 4 channels, the original functions can not be fully realized A.
Therefore, in the past, it has been considered to use III (in E14 as a jannel) in order to extract
some of the functions of the 44 yannel amplifier. In other words, the m channel left and right
speakers are given a signal of 2 channel sound source so as to be normal 1; operated, and no
signal is originally given to the left and right speakers, so the front A 41-channel system is
adopted in which the difference between the signals given to the left and right is taken out and
given to one of the speakers behind it, and this signal and the phase shifted 1011j are given to
the other speaker. In order to obtain such an effect, as a conventional pseudo 4-channel circuit,
among those that have been put into practical use by induction using a transformer, a bridge
circuit is configured to take out a signal. There exists. However, the former one has low input
impedance and 4 has heat in amplification, and the superior one has respective drawbacks such
as complicated circuit configuration and difficult adjustment, etc. In addition, two transistors are
combined using the transistor pace and the reverse property between the core and the register,
and the collectors of these transistors are connected to the engineering and mitters to take out a
signal of one system. Although one circuit configuration itself is simple, it requires at least two
transistors as circuit elements although it is simple, and it can be added to one system of prean 1j
for 1 'pseudo 4 channel circuit. Require a circuit configuration that is disadvantageous to
Sakuragami 1 (4).
This device focuses on the fact that two preamps are not used at all in the case of two channel
sources, and utilizes these preamps to create a very simple four channel amplifier! The purpose
of 4 is to obtain a similar 4 channel circuit. In this device, four independent preamplifiers are
provided by multistage @ circuit by emitter III, and among them, the output terminals of the first
preamplifier are connected to the input terminals of the third preamplifier and the preamplifiers
of the fourth parent. The first stage of the emitter is selectively selected II via a predetermined
value of m pile, and the third system's output terminal is prescribed to the input terminal of the
four system preamplifiers and the first stage of the third system preamplifier. In the case of the
system- (5) channel source, the preamplifiers of the third system and the fourth system mix the
signal of the first system and the signal of the second system. The difference between them is
output as 4 respectively, and 4 works to make their phase invert. An embodiment of the present
invention will be described based on the drawings. 7 (11 (2) + 3) (4) Fi pres ? ? ? ? ? ? ?
? ? ? ? ? ? ? ? ? ? ? ? ?Each has an input terminal + 57 + 6 and 7) 18) and an
output terminal + 971 + @ и 11?0 which is also connected to the Mei иии amplifier (flJ not shown).
The input terminals (7) and (8) are connected to 1iii IJ II, whose input 1 switch is described via
the changeover switch 0 sa-. Therefore, among these preamplifiers (11 (2) and (4), the
preamplifier (3) of the third system is selected, and the unbalanced 2R magnetic flux
amplification circuit of emitter ground by 1 'и (4) QSae , The input terminal (7) is connected to the
pace of the transistor a9 of the first stage via the capacitor OD, the emitter is II via the resistor
08, the collector is a resistor ?9 and a ground terminal, and the old Q is The collector of this
transistor ?S is connected to the pace of the transistor Qe of the second stage, and the emitter
thereof is connected to the ground via the two resistors CIJO4 and one capacitor (C). Connected
to a power supply (2) via a collector (a resistor) and a capacitor is connected between the pace
and the collector, and the collector is a capacitor Between the pace of the first stage transistor a9
and the second stage F rank and the resistance c1 (to the last) of the second engineering mitter.
A resistor (1) is connected and 1 feedback is made, and further, a switch (9) of the transistor 09
is connected with a changeover switch G? interlocking with the changeover switch 03 via a
capacitor (1), The changeover switch a? is connected to the output terminal 0? via a resistor
that forms a feedback circuit, and is connected to the output terminal @ via a resistor.
The changeover switch a3 is connected to the output terminal (9) via a resistor (11)! It is being
deceived. The circuit configuration of the fourth series of preamplifiers (4) is also I и, and the
difference from the above is that the output terminal 0 is connected via a resistor (for 1 switch)
and 1 switch.? is connected 1 and the 1 и output terminal (9) is connected to the changeover
switch 6 via a resistor. The preamps (1) and (2) of the first and second systems of II have no
switch 1 (8) switch 036461 and resistance (d) a4 (d). It is constructed in exactly the same way. In
such a configuration, when using 4 channels, switch @ 3a # is connected to input terminal
+7118111, so that switch G? is also connected so that resistor #Icm constituting the feedback
circuit is connected. It is done. The preamps 13 ++ 4) are both independent of the preamps 11)
12) and are in nine states, and are amplified as totally separate lines of 4-channel sound source
and so on, and output terminal 1910 (IQ ? Q3 to main amplifier) Signal! ?? Perform the
original 4 channel deduction. And if the sound source is for 2 channels. The changeover switch
030 ? G ?? ? is switched to the illustrated state. As a result, the signal from the sound source
is amplified at two input terminals (5J (9) +9) QQ'1kH, but from the output terminal (9 ?),
through the resistance-as the manual power of the preamplifier (3) A signal is given to the base
of the transistor a, and from the output terminal G @@ at the same time, the transistor a! Since a
signal is applied to the emitter 9 and the signal f is applied, a signal corresponding to the
difference between the output terminal (9) and the output terminal QQ is generated in the
collector 7 by the action of the transistor Ocj. In this case, it is possible to generate a strong
signal of component 1 иии of the output terminal (9) by appropriately selecting the resistance иии
value of the resistance a and the (a). Also regarding the preamplifier (4) ?, the signal from the
output terminal is the input signal through the resistance (1): 1: The source of the transistor Ocj
has an output terminal (the signal from 91 is a resistor) As a result, the signal corresponding to
the difference between the preamplifier (4) and the 9 transitions 1 ии is generated. Moreover, the
output signals generated at the output terminals a and a through the transistor ae differ in phase
by 180 degrees, and the signals themselves are different.
In this way, different signals are generated at a ? ? of the output terminal (9) a, so nine
speakers connected to these are as if the sound source is for two channels, as if they were four
channels Can give a similar sense of reality when using a sound source for Moreover, since the
preamplifier (3: (4) is used only by adding the changeover switch asa * a ? and the resistance 31
((4 (d) to (d)), there is no waste in the amplification arrangement configuration . This device is
well-structured as described above, and it is possible to amplify 4 channels by 1 stage
independently, each with 4 stages of preamps by 1 stage. 1 For amplification, use the
preamplifier 4 of the first system and the second system, and output terminals of these for the
third system. The difference between the two is by connecting one to the input terminals of the
second and fourth lines via a predetermined resistance, and connecting seven to the emitter via a
predetermined resistance. It is possible to obtain a signal that has joined the phase, make it
possible to construct a pseudo 4 channel circuit with a very simple circuit, and it is possible to
use either of 11 components depending on how the resistance value is determined. Signals can
be obtained simultaneously, etc. It has the excellent effect of ??
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