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The present invention relates to a drive system of an electroacoustic transducer that converts
encoded digital electrical signals directly into analog acoustic signals. In recent
telecommunication, PCM signals are also used in the audio frequency range, but this is because
noise interference or delay << compared with conventional amplitude modulation and analog
signals, so the dynamic range is In addition to the basic merits of large and low distortion
transmission, it can be recorded in a large capacity / memory, and signal processing such as
synthesis analysis of signals using a processor by integration with video and other data In the
aspect of having a merit of fJ. Conventionally, in order to finally convert the encoded digital
electrical signal having such a feature into an acoustic signal, an electrical fl I) A converter
converts it into an analog electrical signal, which is converted into a conventional electroacoustic
transducer. The method of converting into an acoustic signal is common. However, this method is
not only expensive and requires an A-converter, but also requires an output amplifier that can
withstand the maximum value of the converted analog signal, and the ordinary output is small
compared to the capacity of the amplifier and uneconomical. In addition, there is a drawback that
the intrinsic merits of digital signal processing are reduced, such as the increase of nonlinear
distortion and the limitation of dynamic range. There are electro-acoustic transducers which
convert digital electrical signals directly into analog acoustic signals in order to eliminate these
drawbacks. For example, in Japanese Patent Publication No. 54-12049, a transducer having a
structure in which a single piezoelectric element is provided with an electrode of a bit-number
and this piezoelectric element is coupled to a single diaphragm is started. Another example is an
electrodynamic transducer, in which a number of voice coils equal to the number of sotos are
wound on a common winding frame, and a speaker having a structure in which this winding
frame is coupled to one diaphragm is present However, since the speaker of this structure also
moves the voice coil of the bit without the presence of the input signal pulse, it is more difficult
to realize the efficiency by the back electromotive force. The present invention relates to a
driving method of an electroacoustic transducer capable of directly converting a digital electrical
signal into an analog acoustic signal without losing the merits of the digital signal processing.
The operation principle and system will be described in detail with reference to FIGS. 1 (a), (b),
(c), (d) and FIGS. FIGS. 1 (a), (b), and (cL ('d)) are examples showing the correspondence between
the signal encoding and the waveform in the driving method of the electro-acoustic transducer of
the present invention. Fig. 1 (a 1) shows the correspondence between the analog number and the
digital number, N is the number of bits and the highest digit of the bit (8 (SB) is the bit for
polarity determination of Analog 1 and other 1), the analog value is left Converted to a binary
code consisting of N-existing bits.
Each hint, for example, the (N-1) th bit corresponds to 2N ? 2 in the original analog value, but
this corresponding analog value is called a focus weight. Also, (MSB) sets 1 to 1 if the
corresponding analog signal is positive and 0 to 1 if it is negative. FIG. 1 (b) is a digital electric
signal in which the signal represented by the binary code in FIG. 1 ('a) is a digital electric signal,
and the code 1 corresponds to one electric pulse. In the figure, lb, lb '.. are electric pulses of the
first bit, 2b, 2b'... Electric pulses of the second bit '', and (N-1) b, CN-1) b '. .. Represent N-1 bit
electrical pulses, M b, M, b '... Represent (MSB) electrical pulses. Also, dotted line A is an analog
signal. ASb, ASb ', ... are the sampled analog signals. FIG. 1 (c) is a digital electric and other
waveform applied to an electroacoustic transducer using the driving method of the present
invention. These signals are digital electrical signals constituted by after-amplitude pulses whose
polarity is defined by the MSB signal. FIG. 1 (d) shows the sound pressure radiated from the
sound producing portion of each bit of the electric-to-sound converter of the present invention
and the total focus synthesized sound pressure waveform thereof. Since the applied signal pulse
is a residual vibration "one", the sound producing part of the transducer coupled to each focus is
a structure or a driving system capable of emitting a sound pressure proportional to the weight
of each bit There is a need. Is the sound pressure radiated from the sound producing portion
corresponding to the first bit, and if this sound pressure is 1, the sound pressure corresponding
to the second bit 2'd, 2d '. ... the size 2 and the sound pressure (N-1) d corresponding to the N-1
focus, and ('N-1) d' ..... is the size 2N-2. Or required. The sound pressure from each of the sound
producing parts is spatially synthesized to become ASd, ASd ',... And these are averaged to
become an acoustic signal Ad equal to the original analog waveform. 2 (a) and 2 (b) are a front
view and a cross-sectional view, respectively, of the electroacoustic transducer of the first
embodiment of the present invention. ???????? .. 8- (N-1) are (N-1) independent
conductors, all having the same length and equal width, and etching, printing, etc. on one
diaphragm 2 parallel to each other It is formed by suitable means. The diaphragm 2 uses a thin
film (for example, a plastic film or the like) of an electrically insulating material. A magnetic
circuit 4 forms a magnetic field 5 in the magnetic gap, and the diaphragm 2 is disposed in the
magnetic field 5 and supported so that the magnetic flux in the gap is parallel to the diaphragm
surface and orthogonal to the nu conductor. It is held in place by the tool 6 ░ 6 '.
FIG. 3 is a connection diagram showing the connection of hints between an N-bit decimator 1
source signal source and the electroacoustic transducer of the present invention in the drive
system of the present invention. The pole of S-1 ░ S-2, -5- (N-1) LtMS B! A switch circuit that
operates with the determination signal and switches the polarity of the signal, and 7 is a polarity
determination circuit for operating each switch circuit. The (N-1) conductors are individually
connected in series individually with electrical resistances R-1, R-2 DEG... R-CN-1 of resistance
values that are inversely proportional to the weight of each bit. -I-1, 1-2, 1- (N-1) are the currents
flowing through the respective conductors. The electric current 1-1.1-2 ░ ... -1- (N = 1) which
proportionally weighted the weight of the residual power "1" shown in Fig. 1 (c '). The flow
generates a driving force represented by magnetic flux density О conductor length О dragon
flow value, and an electric pulse of the diaphragm radiates a sound pressure proportional to the
weight of each hint from the applied conductor portion, and the other bit The sound pressure
radiated from the corresponding conductor is combined in space to reproduce and radiate the
analog acoustic signal shown in FIG. 1 (d). In the driving method of the electro-acoustic
transducer of the present invention, the (N-1) conductors corresponding to each bit of the
transducer used are equal in length and width, and thus apparent surface density of the
diaphragm The effect is to prevent distortion caused by the disturbance of the vibration mode
because it is uniform, and furthermore, the directivity is good by making the diaphragm in a
narrow width because the inside of the conductor becomes irrelevant to the weight of the focus.
Since electric resistances are individually inserted in series individually in order to make the
current flowing in the (N-1) conductors be a current proportional to the weight of each hint, each
electric resistance is a variable resistance ?By this, it is possible to correct the resistance of the
resistance value caused by the sagging of the dimensions of the conductor and the 7 N1
alignment on the performance of each bit of the drive amplifier, and the performance
improvement of that is obtained. It is FIG. 4 is a cross-sectional view of a converter showing
another embodiment (2) of the present invention, in which the conductor clearances of the (N-1)
conductors adjacent to each other are supported by the respective supports 6, 6 '. Each member
is individually supported so that each conductor and its neighboring diaphragm can operate
independently without affecting each other, and they are arranged in a common magnetic gap 5
'. In the electro-acoustic transducer of this configuration, only the conductor to which the electric
pulse is applied operates, and therefore, high fidelity reproduction is possible without distortion
due to interference of other conductors. 5 (a), 5 (1) are a front view and a sectional view of
another embodiment 3d converter of the present invention, wherein the (N-1) conductors are
concentrically arranged on the diaphragm 2 surface. The self-organizing diaphragm 2 is disposed
in a magnetic air gap 5 'having a magnetic flux which is radial to the center of the concentric
circle and parallel to the diaphragm surface.
4 'is a magnetic circuit for generating the magnetic flux. The diaphragm 2 is held by the support
8.8 'in the magnetic air gap 5' so that the concentric conductor is orthogonal to the magnetic
flux. Since this type of converter has a diaphragm-like shape of a trapezoid and the symmetry of
the peripheral sound pressure distribution and directivity is good, and in the case of the same
diaphragm area, it is 2 compared to that of a linear conductor. It becomes compact. Conductors
of square and other polygons are also included as having similar effects. As described above,
according to the present invention, (N-1) conductors having the same length and width are
formed in parallel on the diaphragm 2 made of an electrically insulating thin film, and the
diaphragm is placed on the diaphragm surface. Each of the conductors of the electroacoustic
transducer installed in the magnetic field 5 parallel to and orthogonal to the conductors is
individually connected to the electric resistance of the resistance value inversely proportional to
the weight of each hint (this resistor is The present invention relates to a drive system of an
electroacoustic transducer characterized by converting an N-bit encoded tental electrical signal
to each of the conductors directly by applying an N-bit encoded tental electrical signal to each of
the conductors. It is a very useful invention having wide practicality in the field of equipment,
audio and the like.
Brief description of the drawings
1 (a) shows the correspondence between analog values and N-bit binary codes, FIG. 1 (b) shows a
waveform diagram of N-bit electric signals and corresponding analog signals, and FIG. 1 (C ')
shows conversion Figure 1 (Q: output sound pressure waveform diagram, Figure 2 (aL (b): front
view and cross-sectional view of the electro-acoustic transducer of the first embodiment of the
present invention; 3 is a connection diagram showing the connection between the converter and
the digital signal source, FIG. 4 is a cross-sectional view of another embodiment 2 of the present
invention, and FIGS. 5 (a) and 5 (b) 1)) is a conductor, (4) is a magnetic circuit, (5) is a magnetic
field, (6), (, 6 ?) и is a support, (7+), (: 7?1) is another embodiment f The support means; =;
(?) (b) 2 years of age 2 Figure 1 1 1 1 1 1 1 1 year of age 31 years old eyes (),) (IL-) years old))
Procedure amendments (spontaneous) 1, the display of the case 1958 Patent Application No.
5142 No. 2, title of the invention Driving method of the electrodynamic electroacoustic
transducer 3, Relationship with the case making correction Patent application Requesting
person's address ? 572 Shield at LOL! ff 171 j fi Name No. 1 (027) Representative of Onkyo Co.,
Ltd. Takeshi Godai 4, Agent Address ? 572 Osaka Prefecture Neyagawa City Nisshincho No. 1
(6, 1) Description-1 on page 1 2 Complete the claims as follows. ?N bit 1 including a bit for
polarity determination (M S B ?), and in a driving system of an electroacoustic transducer for
converting an ossified electrical signal into an acoustic signal, the length and the width are equal
(N?1 ) Individual ? conductors (8-1), (8-2),... (3- (N-1)) in parallel on the same plane ?, and a
plane diaphragm (2) 2) 1Rkl = Ro [(2N ? ? / Wkl?) for each of the conductors of the
electrodynamic electroacoustic transducer having a magnetic circuit (4) forming a magnetic field
(5) parallel to the crucible and orthogonal to the conductor 11 where W k is the weight of the
second bit (W l (= 21 <'i K = 1.2. ?=, (N?1 +) (Rk) is a series resistance connected to a conductor
corresponding to the 1 st bit. K is a bit number. I (N-1) Ro is the electrical resistance of the
conductor. (4) A driving system of an electrodynamic electroacoustic transducer characterized in
that corresponding bit coded signals are respectively input via resistors having a resistance value
which can be realized. (6 ░ 2) ?The above (N?1) conductors to...? In the seventh to seventh
lines of the specification are serially connected ?... Individually on the ninth line. [The above (N1) conductors have series resistance R-'1 for the first bit, series resistance R-2 for the second
bit,... A series resistor R- (N-, 1) is connected to the (N-1) th bit. Generally, if the serial resistance
of the bit number is (Rk l, (Rk lO value (Rk)-Ro [: (Z (N-2! / Wkl B ииииииииииииииииииииииииии (1) or (R1 <1-R ?
L 2 (N-to-1-1) ... .................. (11) where K = 1.2 in the l (& "ii No. bit. ... (N-1) Ro is the value of the
direct current resistance Wk of the conductor with the weight value of the second bit Wl (having
a value expressed by 2k ') (, 6, 3) Specification page 10, In the ninth line, "it is inversely
proportional to the weight of each bit" is corrected as "represented by equation (1)".
(6, 4) FIG. 3 of the drawing is changed as a separate sheet on the part side.
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