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JPS57186897

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DESCRIPTION JPS57186897
No change to the clear text G of cut at) a specification 1, the name of the invention
スピーカ
3. Detailed Description of the Invention The present invention relates to a loudspeaker suitable
for use with digital audio equipment. Recently, even in the field of audio equipment, it has
become possible to record an acoustic signal as a pulse code modulated (PCM) digital signal on a
recording board or the like in order to achieve high density of information and high precision of
signal. It is coming. However, in the conventional speaker, since the diaphragm can be driven
only by an analog signal, a PCM digital signal obtained from a record disc or the like is converted
to an analog signal by a digital-analog converter, and then the analog signal is amplified It was
not possible to input it to the speaker and listen to the playback sound unless it was amplified by.
For this reason, even if the signal at the stage picked up from the record board or the like is
accurate and accurate to the signal recorded on the record board, the signal is distorted in the
subsequent process of digital-analog conversion or amplification. As a result, noise was mixed in,
and the characteristics of the PCM digital signal could not be fully exhibited. Therefore,
conventionally, as an electric-acoustic transducer that solves the above-mentioned problems by
directly converting a digital signal input into an analog acoustic signal, that is, a speaker,
vibration proportional to the weight of each bit of the digital signal input in parallel A drive to a
plurality of conversions 36B ヲ a with area is proposed in Bell System Technical Journal, Volume
59, 119, 1980. However, in this EndPage: 1 speaker, when the number of bins F of the digital
signal is large, the area of the diaphragm corresponding to the lower bit and the upper bit will be
largely different, so the forming precision of the diaphragm is necessary. In addition to the need
to make the response speed of each transducer equal, there are many difficulties in actually
producing a speaker, such as an increase in the size of the speaker. In addition, in this speaker,
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since the binary digital signal is acoustically synthesized to be an analog signal, the directivity
becomes extremely poor. Furthermore, 1. If the digital signal input is represented by a commonly
used two's complement number, it has the disadvantage that the polarity of the input needs to be
reversed according to the sign bit. The present invention has been made in view of the abovedescribed point, and an object thereof is to provide a speaker capable of directly converting a
parallel digital input signal into an analog acoustic signal in a diaphragm. The invention will now
be described with reference to the drawings.
FIG. 1 shows the basic construction of the loudspeaker according to the invention in the case of a
parallel digital signal input of 31: ". In the figure, reference numeral 1 denotes a flat diaphragm,
and 2a to 2g are driving force generating units which are provided on the vibrating plate 1 and
generate equal driving force to drive the vibrating plate (the driving force is generated. The
driving force generating portion 2a provided at the center of the diaphragm 1 is selectively
selected depending on the state of the input line 3a corresponding to the least significant bit of
the input lines 3a to 3c to which the binary parallel digital signal is applied. The driving force
generating units 2b and 2c provided up and down so as to sandwich the driving force generating
unit 2a to be operated are selectively operated according to the state of the input line 3b
corresponding to the second order bit. The two driving force generating units 2d to 2g provided
on the left and right sides so as to sandwich the driving force generating unit 2a are selectively
operated according to the state of the input line 3c corresponding to the most significant bit.
According to the configuration as described above, according to the binary digital signal, the
driving force generation units of the number according to the weight of each bit are operated to
generate the driving force, and they are synthesized by the diaphragm l Digital-to-analog
conversion is performed. In addition, as an electro-mechanical conversion type of a driving force
generation part, an electrodynamic type, an electrostatic type, a piezoelectric type etc. are
possible. In the embodiment described above, although the parallel digital signal input is 3 bits,
in the case of a digital signal of n bits in general, 2n-1 equal driving force generating units are
disposed on the diaphragm; Depending on the state of each bit, driving force generating units of
the number according to the weight of the bit may be operated, and the driving force generated
by each may be synthesized on the diaphragm. It is preferable that the arrangement of the drive
force generation unit on the diaphragm is performed so as to apply an average drive force to the
diaphragm when the drive force generation unit corresponding to each bit is operated. By the
way, parallel digital signals include those represented by offset binary, folded binary, and 2's
complement. In offset binary, the maximum peak-peak of the signal is represented by a binary
number in which all bits are O and a binary number in which all bits are 1; Since it is expressed
as a binary number between the base numbers, it can be applied as it is to the speaker of the
configuration of FIG. In the case of folded binary, since the most significant bit of the binary 5number represents the sign of the signal as a sign bit, an input corresponding to the sign bit is
added, and other bits are added according to this sign bit. It can be applied to the speaker of the
configuration of FIG. 1 by reversing the polarity of.
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Then, in the case where it is expressed by 2's complement, if the direction of the driving force
generated by the driving force generating unit provided corresponding to the most significant bit
is made opposite to that of the other, this display format The present invention can also be
applied to digital signals of FIG. 2 is for explaining the combination of driving forces when the
speaker of FIG. 1 can be applied to a 3-bit digital signal input represented by a 2's complement
as shown in the following table. 6-EndPage: 2 As shown in the table, adding 011 in 2's
complement notation corresponding to +3 in decimal notation to the input lines 3a to 3C in FIG.
The driving force shown by the arrow is generated by the driving force generating units 2a to 2c,
and a force of synthetic driving force +3 is applied to the diaphragm 1. For digital signals
respectively corresponding to +2 and +1 in the IO system indication, driving forces as shown in
FIG. 2 (bl and (C1 respectively are applied to the diaphragm 1 and correspond to 0 in the decimal
system In the case of a digital signal of 2's complement binary representation Ooo, as shown in
FIG. 2 (d), no driving force is applied to the diaphragm l. When a digital signal of 2's complement
binary representation 111 corresponding to -1 of IO binary number representation is added, the
drive force generation units 2d to 2g generate the signals shown in FIG. The force and the
driving force indicated by the upward arrows generated by the driving force generating units 2a
to 2c are applied to the diaphragm 1. These driving forces are synthesized on the diaphragm l,
and as a result, a driving that results in -1. The force acts on the diaphragm 1. In this case, digital
signals 110, 101. When 100 and 100 are applied, the driving force shown in FIG. 2 (fl through
(hl is applied to the vibrating plate 1, and as a result, the driving forces of -2, -3 and -4 are
applied to the vibrating plate l respectively). Will work. 3rd v! i represents an embodiment of
a driving force generating unit in the case where the speaker according to the present invention
is configured as an electrodynamic speaker. In the illustrated embodiment, the speaker is
configured to be applicable to a digital signal input of binary representation of binary
representation of 3 vias), and on the plane diaphragm 1, a straight line of 23-1 = 7 straight lines
of the same length p. Conductors La to Lg are disposed in parallel, and current sources' Ia to 1g
are connected to one end of the conductors La to Lg. The other ends of the conductors La to Lg
are interconnected, and the other ends of the current sources b and Ic and the current sources Id
to 1g are interconnected, and the interconnection points of the conductors La to L [, Switches So,
S1 and s2 are provided between the other end of the current #Ia, the other ends of the current
sources rb and Ic, and the other ends of the current sources Id to 1g, respectively.
The supply current directions of the current sources 1d to 1g are opposite to those of the other
three current sources Ia to 1c. The diaphragm l is disposed in a uniform static magnetic field of a
magnetic flux density B in a direction parallel to the diaphragm surface and orthogonal to the
conductors La to Lg. Each current source is adapted to supply 41 to the corresponding
conductor, so that when the switches So, S, and s2 corresponding to each bit 9-t are turned on in
response to the digital signal input, in practice Current i flows in the conductors, and equal
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driving force F〒Bli can be obtained in each conductor. In the speaker of FIG. 3, since the
conductor corresponding to the lower bit is disposed on the right side of the diaphragm 1 and
the conductor corresponding to the upper bit is disposed on the left side, uniform drive is applied
to the diaphragm 1 In order to equalize the combined driving force on the diaphragm, as shown
in FIGS. 4 (a) and 4 (b), the conductor corresponding to each bit is placed on the diaphragm. It
may be dispersed and arranged substantially in the average. Note that, in the example of the
figure, the distributed arrangement in the case of a 4-bit digital signal is shown. In addition, when
the input digital signal is represented by a two's complement, the arrangement of the conductors
is particularly shown in FIG. 4 (the most significant bit and the conductors corresponding to the
other bits are alternately arranged as shown in bl). To form a magnetic circuit as shown in FIG. 5,
for example, in which the direction of the magnetic field linking the adjacent conductors is
reversed, and the conductor is arranged as described above in the static magnetic field of this
magnetic circuit. Vibration 10-EndPage: By installing the three-motion plate 1, it is possible to
make the current direction in each conductor the same. In FIG. 5, 4 is a magnet and 5 is a yoke.
In the speaker of FIG. 3 described above, if the conductors corresponding to each bit 2 are
connected as shown in FIG. 6, the resistances of the respective conductors are equal, so as shown
in FIG. 7 (al The current in each conductor can be equalized by configuring the drive source by a
circuit consisting of a constant voltage source E and a switch S switching the same according to a
digital signal input. Furthermore, when the speaker is configured as shown in FIG. 5, all the
current directions are the same, so the polarities of the voltage sources are all the same, and as
shown in FIG. 7 (b), the constant voltage source E is One drive source can be configured. FIG. 8
shows a more specific configuration of the speaker of FIG. 5. In the yoke 5, holes 5a for radiating
the sound generated by the vibration of the diaphragm 1 are provided between the mounting
surfaces of the magnet 4. The outer peripheral portion of the diaphragm 1 is supported between
the spacers 6 inserted between the yokes 5 via the sustain date 7, respectively.
FIG. 9 is a simplified view of a speaker assembled using the configuration of FIG. 4 for conductor
arrangement and using the configuration of FIG. 7 (b) for the drive source. By the way, in the
speaker shown in FIG. 9, 2 n lead wires are required to be drawn out from the diaphragm 1.
Conductors corresponding to each bit are formed on the diaphragm in a state including parallel
connection, By laminating and forming the entire diaphragm, the number of lead wires can be
reduced to N1. In this case, if the upper bits are further divided into a plurality of diaphragms,
the area of the diaphragms need not be made larger than necessary. In the embodiment
described above, the flat diaphragm is used as the diaphragm and the conductor is disposed on
the diaphragm, but when the number of bits of the digital signal is n in the bobbin connected to
the diaphragm, 2n-1 A bobbin wound with a coil is placed in a magnetic circuit that generates a
static magnetic field perpendicular to the coil, and the weight is assigned to each bit. By
energizing the number of coils, it is possible to drive the diaphragm with a driving force
corresponding to the digital signal. As described above, according to the present invention, 2n-1
driving force generating units for generating driving force for driving the diaphragm are
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provided for n bits of parallel digital signal input, and the number corresponding to the weight
for each bit The above-mentioned driving force generating unit is operated, and the diaphragm is
driven by the driving force corresponding to the digital signal input. Therefore, since the driving
force corresponding to the digital signal is synthesized in the diaphragm to perform digitalanalog conversion, all the drawbacks of the conventional acoustic synthesis are eliminated. In
particular, as in the embodiment, if the direction of the driving force of the driving force
generating unit corresponding to the highest bit of the digital signal represented by 2's
complement is reversed from that of other bits, the 2's complement digital signal is generated.
Can be input directly to the speaker without any processing. In addition, a loudspeaker is an
electrodynamic type, and 2n-1 linear conductors having the same shape are arranged on each
other in a plane 13-row on a planar diaphragm, and a direction parallel to the diaphragm surface
and orthogonal to the conductor In the speaker in which the diaphragm is disposed in the static
magnetic field having a uniform magnetic density, the configuration of the driving force
generating portion can be simplified, which is advantageous in manufacturing. In addition, many
useful effects can be obtained as an actual speaker by configuring as in the above-described
embodiment.
4. Brief description of the drawings FIG. 1 is a simplified plan view showing the basic
configuration of the loudspeaker according to the present invention, FIG. 2 is a diagram for
explaining the operation of FIG. 1, and FIG. A simplified diagram showing an embodiment
configured as an electric type speaker, FIG. 4 (al and a mountain) showing a modification of a
part of FIG. 3, and FIG. 5 showing an electrodynamic type speaker constructed according to the
present invention 6 is a view showing a modification of a part of FIG. 3, FIG. 7 (a) and (b) is a
view showing a modification of another part of FIG. 3, FIG. FIG. 8 is a side sectional view showing
a more specific structure of the speaker shown in FIG. 5, and FIG. 9 is a simplified view showing a
preferred embodiment of the electrodynamic speaker according to the present invention. 14EndPage: 41: Diaphragm, 2a to 2g: Driving force generator. Patent applicant Pioneer Inc. 15-m
clean page (No change to the contents) Fig. 2 (0) (b) EndPage: 5 procedure corrections (from @) S
1 s 1 41 願 (1) 1, presentation of the case Showa year patent application No. 2 of the case, title of
the invention Δ-1;-On main, E speaker 3, person making correction 15- Fig. 2 (0) (b) EndPage: 5
Procedure Amendment (from @) Secretary of Patent Office S Patent Office 2 1 41 patent
applications submitted (1) 1, display of case Showa year patent application No. 2, title of
invention Δ-1;-On main, E-speaker 3, relevant person with correction case Patent applicant
address Tokyo Meguro 1-4-1-4-1-4-(5 ") Pioneer Corporation 4 agent address Chiyo Tokyo
Subdivision Uchisaiwaicho 2-1-1 (Meshi舒 building) Yubinbango100 phone Tokyo (about 2)
3171 (representative) Name (6069) patent attorney Takino Hideo / 8, as the contents of Exhibit
of correction EndPage: 6
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