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JPS56131294

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DESCRIPTION JPS56131294
Description 1, title of the invention
デジタルスピーカシステム
3. Detailed Description of the Invention The present invention relates to a digital speaker system
in which D / A conversion, that is, a digital signal is converted to an analog signal by the speaker
itself. When trying to increase the power efficiency of the entire reproduction system in the
speaker system, either the efficiency of the speaker eye or the efficiency of the power amplifier
can be increased, but since improvement in the efficiency of the speaker can not be expected, In
the past, power has been poured into efficiency amplifiers. An example is a PWM7 amplifier,
which is generally called a D class amplifier. However, since the PWM amplifier has to select the
carrier to be ten times or more of the frequency of the reproduction signal, a gradually higher
carrier frequency of several 100 KHz is required. The PWM amplifier uses switching and should
be efficient, but because of this poor carrier frequency, so high efficiency can not be expected (a
problem with improvement of power efficiency). Therefore, an object of the present invention is
to provide a digital speaker system capable of significantly enhancing the power efficiency of the
entire reproduction system. A first embodiment of the present invention is shown in FIG. That is,
this digital speaker system shows the case of a 4-bit binary code in which the digital message has
two's complement, and constitutes a voice coil of a dynamic 'It type speaker and has a bit
Transfer type sweeps I ss (I = t, z, a) are connected to the coils i1 to 12 of the same number of
turns of the same number of coils 1 to 3 and the current value of each of the coils 1 to Connect t
flow source I (i-1 to 3), -1 to (i = 1 to 3) with a weight of 2 l-11 o (lo is an arbitrary value that is
not zero), and connect the coil to the speaker field unit A shorting coil S is provided to eliminate
one to three self and mutual inductance. In this digital speaker system, when the binary code is in
the form of φa3a2al with MSB (鮫 upper bit) as a code bit, switch 512 (+ = 1 ° (5) 2.3) is on the
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side of terminal ■ Connected to the current source -1i '/ q-, and when al (i = 1 to 3) is 1, the
switch Sil is connected to the terminal .beta. : 1 to 3) KI-1] Control to add. As a result, the number
of turns of the coils 1 to 3 is all the same, so the combined force F acting on the entire coil. It
becomes as follows in proportion to the sum of ltR, which flows to each coil 1, 2.3.
すなわち。 F=(Bt)(a3・4!。 Here, (B1) is a force coefficient for each coil 1 to 3 # /
C. When the binary code is in the form of la3a, a, the switch S □□ (1 = x, 2.3) is connected to the
terminal ■ side to short t 9 m, 11 and further A switch Si2 is connected to the terminal 1 side
when al is 1 and t current source -I is applied to the coil 1, and control is made to be connected
to the terminal 1 side when at is φ. The resultant force F acting on the entire voice coil at this
time is as follows. すなわち。 F =-(Bt) (a3 · 4Io + a2 · 2Io 10 a □ · io) (6) EndPage: 2 In this way,
a binary digital signal is converted to an analog signal of force F. On the other hand, Due to the
presence of the short coil, the mutual inductance and the self-inductance of the coil 112.3 are
eliminated, and each of the coils 1 to 3 acts as a pure resistance with respect to the flow source
il-11, and the effect of the other film mutually Without being received, each 4 ffi # 11 ° -1, will
operate stably. Because of this configuration, this digital speaker system has the following effects.
That is, since the φ conversion (analog-digital conversion) Ic and the sampling frequency are
twice or more of the reproduction frequency, and in fact, sampling is performed at a low
frequency of several tens of KHz, as in this embodiment By converting a digitized signal directly
into an analog signal, switching speed can be reduced and switching loss can be significantly
reduced as compared with the PWM 7 amplifier, and a high efficiency and high linearity sound
reproduction system You can play An embodiment of @ 2 of the present invention is shown in
FIG. That is, this digital speaker system is a case where the digital signal is a 4-bit symmetric
ternary code, and switches SS (+ = 1 to 4) are connected in parallel to the four coils 1 to 4
constituting the voice coil. 12 current sources 11 □ and -11 □ (i = 1 to 4) connected with
switches S1 □ and S12 of each coil 1 to 4 with a wheel of 3l-110 (Io is a non-zero 1000g value)
It connects, and 7th-coil S 'is provided in the field part of the speaker. 17) In the digital speaker
system, assuming that the symmetric ternary code is in the form of a4a3a2a, when al (+ = 1 to 4)
is φ, the switch 'illSi2 is connected to 1- of the terminal ■, al When switch is 1, switch S1 □ is
connected at terminal 14 with switch Si2 connected to terminal 3 respectively, and when a is
−1, switch S1 □ is adjusted at terminal 11 with switch S12 turned to terminal 11 It is VC
controlled to be connected.
As a result, the resultant force F acting on the entire voice coil is as follows. F− (Bt) (a4 · 27Io +
a3 · 91o + a2 · 3Io + aIIo) Therefore, the digital signal is converted to an analog signal of force F.
The short coil eliminates the self and mutual inductances of the coils 1 to 4 of the first
embodiment from the first embodiment, and helps the current sources 1 ° -1 operate stably.
The operation and effect of this digital speaker system are the same as in the first embodiment.
In the following, an embodiment of each component of the invention will be discussed. An
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embodiment of the voice coil is shown in FIG. That is, in (a), coils 1 to 3 are wound around a
bobbin 5 by multiple I-windings, and in the same figure (b), ribbon wires 12 to 3a are overlapped
by 3 ′ ′ 1i and wound around the bobbin. (C) is obtained by winding 311 biaxes @ 1 b to 3 b
on a bobbin. By winding the three films in the same place of the bobbin the same number of
turns, as in Kono, the coefficients of M-to-force conversion in the magnetic gap of each coil, that
is, the (Bt) conventions become all the same, and the precision / A conversion (4 flows) -Power
conversion) becomes oT function. Especially in the case of FIG. (B) (C), by pulling out the lead
wire of the coil integrally, the force due to the leakage magnetic flux can be countered, and the D
/ A converter's intensity is significantly improved (9) In the case of FIG. 101 (a), it is
advantageous to have to tie the leads of all the coils together by another means. In the same
figure (in the case of C1, the area of each layer is 2n (n = 1.2. ・ If it is designed so as to be
N−1), a rational FF required el flow design can be performed. Another example is winding a litz
wire on a bobbin. In this case, by twisting 2n-1 wires, one, two, four, ... 2N-1 wires can be
bundled to make a total of eight coils. ! From the point of view of the F required tFL flow, a
reasonable winding can be made. In addition, although it is effective to increase the accuracy as
described above, since there is a gap between the-and the line, there is a slight loss as a voice coil
winding. An example of the transfer double-sided sweet is shown in FIG. That is, the emitters I of
the transistors TrllTr2 are connected together, the t current source 1 is connected thereto, the
coil 1 is connected to the collector of the transistor Tr1, and the collector of the transistor Tr2 is
grounded. Then, the base + d-constant t of the transistor Tr (10PageEndPage: 3 pressure V is
maintained, and the pace of the transistor Tr2 is controlled to be smaller or smaller b) by the
small voltage V with respect to the constant road pressure 2).
When the base voltage of the transistor T2 becomes (V + v), the transistor Tr1 is turned off (the
current of the flow source 11 flows from the collector terminal of the transistor Tr2 to the
ground). When the base voltage of the transistor 1r2 is set to (V-v), the transistor Tr2 is turned
off, and the current of the drain current source 1 is introduced from the collector terminal of the
transistor Tr1. This operation is equivalent to the transfer-type switch Si shown in FIG. 84 (b) in
which a part of FIG. 1 is taken out. をする。 Also, the switching speed is extremely fast because
the transistors Tr1 and Tr2 are not saturated. An embodiment of a one-bit entertainment circuit
is shown in FIG. That is, in the figure, transistor Tr3. The current mirror circuit consisting of Tr
constitutes the current source + 11 and the current mirror circuit consisting of the transistor
"91" 10 constitutes the t51 E source-1 □, and comprises the circuit consisting of the transistor "s
* Tr6" and the transistor Tr7 ° Tr8 The circuit is similar to that of the embodiment of FIG. ダイ
オードD1 D2は)ランジスタTr5. It is added to apply a normal bias voltage to Tr7. The
current value is determined by the voltage between the cathode of the diode DI and the T node of
the diode D2 and the resistor R. Further, the voltage V is determined to be lower than or lower
than the base voltage of the transistor Tr5. Is the resistance of the coil 仙 and 1 supplied to the
coil i! The current is slightly higher than the side of the rice cake I (RLI). This circuit controls the
pace terminal a of the transistor Tr6 to be slightly higher than the voltage of the base of the
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transistor Tr5, and the current value l escapes the collector of the transistor Tr5 and drops into
the power supply of + V, and then to the collector of the transistor Tr6. No current flows. At this
time, since the emitter-collector voltage of the transistor Tr5 is small, the current value I is
considerably large and the main collector loss is small. On the other hand, when the pace
terminal a of the transistor Tr6 is controlled to be slightly lower than the base voltage of the
transistor Tr5, the transistor Tr5 is turned off and the ta value l flows out from the collector of
the transistor T6. The collector terminal voltage is RL · Ii. Is slightly smaller than (RL · 11), and in
this case also, the collector loss of the transistor 7r is extremely small. The operation of the
transistor T'7 sTrs is controlled in the same manner as the transistors Tr5 and Tra by controlling
the voltage of the pace terminal of the transistor Tr8.
It can be seen that this circuit essentially works as a low loss amplifier, in other words a high
efficiency amplifier. The impedance of the coil i can be made the resistance RL by the effect of
the short coil, 9 self. This is because the mutual inductance is eliminated by the short fill. An
example of a short coil is shown in FIG. That is, the short coil C is a thick wire wound around the
center pole of the magnetic circuit and is a low resistance coil, and one end of the coils 1 to N is
bundled in common and collectively at one end of the pfri coil C. Connecting. Since the number
of turns of coil C and coils 1 to N is selected to be the same (13) mutual coupling is short, the
short coil CiC [will be an 11 t flow acts to cancel the eight bundles passing through the voice coil
bone, As a result, the self and one mutual inductances of fill 1 to N are eliminated. Coil C is low.
There is little loss in this part because it can be made resistive. As another example, the short coil
has the same effect by covering the center pole Ktl core / 1 of the magnetic circuit or inserting a
thick aluminum ring immediately inside the magnet. Finally, when the voice coil made up of coils
1 to N is connected in parallel with these N coils, there is no difference from the 4 normal mfl
type speakers. □ Therefore, in order to have switching means to connect all coils in parallel or r
in series: From □, even if 1tA @ at 4 ordinary analog amplifiers, no sound 1 □ quality,characteristics The speaker itself can be driven by either a digital code or an analog signal, and
the speaker itself 1 '□ has an analog / digital mutual number, which is large and convenient.
1ワよ。 よう、、。。 i、、Aoア、27. (14) EndPage: 4 stems make up a voice coil of
dynamic J-type speaker with N pieces of fill corresponding to each pit, and connect ta source
with 1 mark to each coil Since the control is performed by the switch, the digital signal can be
directly converted to an analog signal to drive the speaker and to improve the power efficiency.
Especially when using an integrated multi-fill as a voice coil. It has the effect that it can be used
as a spilk system for i-pi (a high D / A conversion accuracy can be obtained).
4. Brief description of the drawings FIG. 1 is a circuit diagram of the first embodiment of the
present invention, the second drawing is a circuit diagram of the second embodiment, FIG. FIG. 5
is a circuit diagram of an embodiment of the switch, FIG. 5 is a circuit diagram of one bit, and
FIG. 6 is a circuit diagram of a sheet-fill. 1〜N・・・コイル、11. 11: Electric fL source,
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5illsi2: Switch, C: Short coil (erasing means): FIG. 1 FIG. 2: FIG. 3: End Page: 5 (a) (b) Fig.5 Fig.6
EndPage: 6
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