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JPS50114201

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DESCRIPTION JPS50114201
1 、 Name of invention
Driving circuit for 2-channel stereo headphones
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive circuit for
a two-channel stereo phone. Listening to 2-channel stereo sound is generally done by installing
left and right speakers in a room. That is, as shown in FIG. 1, left and right speakers 1L and 1R
driven by the left and right channel signals are disposed in the room while maintaining a
predetermined interval. Thus, stereo sound by left and right channel sounds from both speakers
1L and 1R is listened to at an apex position of an isosceles triangle whose one side is a line
connecting both speakers 1L and IR. In this case, in consideration of the sound wave reaching left
(or right) ear 2L (or 2TL) from left and right speakers 1L and 1R, the left (or right) ear 2L (or 2B)
K is left (or Right) with a direct wave of sound from the speaker IL (or IR). The right (or left) ear
2L (or 2R) of sound wave from right (or left) speaker IR (or IL) is located more easily than right
(or left) speaker IB (father IL), and the face is shown The frequency characteristics of the left and
right ears 2L and 2B reach the 1st diffracted wave obtained by the diffraction, and the frequency
characteristics become smaller gradually as the height becomes higher in FIG. Synthesize with
sounds that have. . I am listening to the sound. Since the left and right ears 2L and 2R are
respectively listening to such synthetic sounds, a realistic 2-channel stereo sound is being heard.
However, when listening to 2-channel stereo sound with left and right headphones, the left and
right speakers receive only the direct sound from the left and right Hendphones supplied with
the left and right channel signals respectively, so the left and right speakers By listening to the
realistic 2-channel stereo sound as in the case where 2 channels stereo sound t ** is installed in
the room, the present invention is applied to the case where the 2-channel stereo sound is
listened with left and right headphones. . When left and right speakers are installed in a room
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and left and right speakers are installed in a room and two channel stereo sound is listened to the
whole, 1 and two channel sound stereo with a similar sense of realism, left and right headphone
It will become apparent from the detailed description of the invention of the present invention as
the second factor in the book which proposes to be possible. In FIG. 6, 11L and 12L are the first
and second left channel amplification transistors respectively. 11R and 12R have respective
collectors of first and second right channel / channel transistors 11R and 1L which are common
to each other through a common source channel corktor resistor 1L and a DC power supply
terminal 14 (this is an AC signal Collectors of the right channel / channel transistors 11R and
12R are similarly connected to the DC IE source terminal 14 through the common channel
collector resistor 15TL. There is.
Also, the emitter of the transistor 11L is connected to the ground through the emitter resistor
15L and further to the ground through the equalizing circuit 16L for the right channel, and the
emitter of the transistor 11H is also connected through the emitter resistor 15B to the right
channel equalization circuit 16TL1 if necessary. They are respectively connected to the ground.
In this case, each of the equalizing circuits 16L and 16-R is formed by one parallel circuit of one
resistor 17 and 11 capacitors of a capacitor 18 and a resistor 19. In addition, the Toe, Shu, 1 ° L
and 12R0 emitters are respectively connected with the emitter resistor 20L as required. The base
of the transistor 11L is similarly connected between the power supply terminal 14 and the
ground at the connection midpoint of the bias resistors 22L and 22d connected in series
"EndPage: 2" between the power supply terminal 14 and the ground in series. Are respectively
connected to the connection midpoints of the bias resistors 22R and 22R 'which are connected in
series with each other. From the bases of the transistors 11L and 11R, the charge carrier right
channel signal inputs 241 and 24TL are derived from the bases of the transistors 11L and 11R
respectively through coupling capacitors 23L and 26L, and the collectors of the transistors 11L
and 12Ii and the collector resistor 16L Connection midpoint and transistor 11. The right and left
channel signal output terminals 261 and 26B are led out from the connection point between the
collector of the FL and 1'2R and the collector resistor 13B and the coupling capacitors 25L and
25I, respectively. 7 or more is an example configuration of the present invention; however,
depending on the configuration of J9i, if the input terminal 2-4 L and 24 B respectively supply a
right channel signal 庄, these increase transistors 11 L and 11 RK respectively. The amplified
output current is supplied to the collector resistors 13L and 13B, and the bias circuit 16L. And
16 R between each midpoint 21 and the ground. An output in phase with this is obtained based
on the signal at the input to the input terminals 24L and 24B respectively, which are in phase
with each other, and these are amplified by the transistors 12R and 12L, respectively, and the
amplification is performed. Output Current Flows to the collector resistors 13R and 13L.
Therefore, a current of the sum of the current based on the left channel signal supplied to input
terminal 24L and the current based on the right channel signal supplied to input terminal 24RK
flows in collector resistors 13L and 13R together, and thus output terminal 26L and The
combined signal of the Ashiya right channel signal is obtained as each Ashiya right channel
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signal in 26R. In this case, based on the input signal 24L and 24B of the left channel signal
(which is referred to as iEL) obtained at the output terminal 26L, the signal is sent to the input
channel 24L and 24B. In the case of eLL and eLR), the amount of 9 gs eLL is obtained by
amplifying the left channel signal supplied to the input terminal 24L by transistor / 11 LJc
formed by connecting the equalizer circuit 16L to the emitter and obtaining it from the collector
side Because the equalization circuit 16L!
Conden to configure t18. If the values of the resistors 17 and 19 etc. are selected to be i1, the
signal valve eLL obtained at the output terminal 26LK is the music 1 in FIG. The father signal
portion eLR obtained by the frequency response characteristic of 3A is amplified by the
transistor 11R 'formed by connecting the right channel signal supplied to the input terminal 24B
to the emitter by the equalizing circuit 16R' '. Since the output obtained from the midpoint 21 of
the resistor 17 of the hatching circuit j6R is a signal which is amplified by the unconnected
transistor 12 LK of the equalization circuit and is obtained from the collector side, the hatching
circuit 16 II Lt-Over configured Cone Dansa 18. If one of the resistances 17 and 19 etc. is
selected appropriately, the one signal valve eLR obtained at the crystal power terminal 26L is
obtained by the frequency and supersonic characteristics of the curve 113B in FIG. . Therefore, if
the left channel-signal EL obtained can be supplied to the left-hand phone and played back and
listened to this, the Ashiya right speaker will be installed in the room and the stereo sound will be
heard with the left ear. It is a book that will be able to listen to stereo sound similar to the stereo
sound to be heard. In addition, signal valves (such as these are referred to as eRL and eRR,
respectively) based on the Yayaya right channel signal supplied to the input terminals 24L and
24R of the right channel signal (referred to as "ikgB") obtained at the output terminal 26'FL. 2),
the signal valve e'RR has the frequency response characteristic of the curve 11J3A in FIG. 2 as in
the case of the signal portions eLL and eLR of the left channel signal EL obtained at the output
terminal 26L. The signal valve eRL obtained is obtained with the frequency response
characteristic of the second-middle curve 6B, and accordingly, the right channel signal ER
obtained from the output terminal 26 ′ ′ iE is supplied to the right headphone to reproduce
the suspiciousness. If you do, you should also install stereo in the same room with speakers in
the right room, and listen to stereo sound similar to the stereo sound heard with the right ear
when listening to EndPage: 3 sound. Those that would capable. According to the configuration
described above, the Ashiya right headphone can be driven to obtain the same listening effect as
when the Ashiya right speaker is installed in the room and the 2-channel stereo sound is listened,
and such an effect. Has a great feature which can be obtained with an extremely simple
construction as a whole. Although it can be driven so as to obtain the same listening effect as
listening to the Nell stereo sound. In the configuration described above, the equalization circuits
16L and □. 16L and parallel each with large leaf condens t50L and 30'Bf, respectively, as
needed. Connect shorting switches 61L and 31R, and close 2nd class shorting switches 31L and
31Re, respectively. D2 equalization circuits-signal output 'fit' to transistors 12TL and 12L from
16L and 16R, respectively.
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Since the open circuits 5O-1142ffl (4) are eliminated and the equalizer circuits of the transistors
11L and 11H are not connected to the equalization circuits M16 L and 16R, respectively. A
flattery l! By only the signal based on the Ashiya right channel No. 48 supplied to the Ashiya
right input terminals 24L and 24B at the Ashiya right output terminals 26L and 26R
respectively! It is possible to obtain the Ashiya Right Channel Signal No. 9 exhibiting j-wave
number response characteristics, and thus listening similar to the case where the Ashiya Right
Headphones and the Ashiya Right Speaker are installed in the room and 2-channel stereo sound
is taken. If it can be driven to obtain an effect, it can be driven to obtain the same listening effect
as in the case where two channels of stereophonic sound are listened to one by one normal
Ashiya right headphone. In the effect that can be obtained, the shorting switches 31L and 51R
are respectively connected in parallel with the circuits 16L and 16R. With the characteristic that
it is sufficient only to provide In this case, the resistors 32L and 32R are connected in parallel
with the shorting switches 3'L and 31B, respectively, and the noise is unnecessarily generated
based on the on-off of the switches 31L and 31R in cooperation with the cond-knobs 31L and
31B. It is possible to prevent unnecessary fluctuation of the DC bias value to the emitters of the
transistors 11L and 11B without doing so.
4. Brief description of the drawings. · Fig. 1 is an explanatory drawing of the case where the
Ashiya right speaker is installed in the room to listen to 2-channel stereo sound, Fig. 2 is the
frequency response of the sound wave reaching the Ashiya right ear in this case. Curve diagram
showing the characteristics. FIG. 6 is a connection diagram showing an example of a two-channel
stereo headphone drive circuit according to the present invention. In the figure, 11L, 11J12L and
12B are transistors for amplification by the relatives, 13L and 13R are collector resistors, and
16L and 16R are equalization circuits. Reference numerals 17 and 19 denote resistors, 18
denotes content, 2-1 denotes a middle point, 24L and 24B denote input terminals, a child and
26L and 26B denote output terminals. Applicant Tierk Co., Ltd. EndPage: 4 Fig. 2 Japanese Patent
Application Laid-Open No. 50-1142σ1 (5) & the other inventors EndPage: 5
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