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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of supplying power to a speaker group combined into a flat surface and a control method
thereof. The power supply unit, the power switching technology, and the control technology
thereof that constitute the present invention are known, but when driving a planar composite
speaker, the concept of the drive method itself of matrix structure and high performance and
high speed in recent years Low-cost, high-performance flat composite speakers can be realized in
combination with the signal processing technology by the signal processor. It compensates for
the disadvantages of flat speakers with poor acoustic characteristics and can provide thin
speakers with good acoustic characteristics. The flat speaker is easy to match with the structure
of a desk or a room, and the freedom of design is also high, which makes it possible to design a
speaker with design priority.
2. Description of the Related Art Flat speakers have long been proposed and put into practical
use. Broadly classified, there are two types, one to which the piezoelectric effect is applied and
the one to which the electromagnetic effect is applied. Generally, since the drive source is
distributed or combined, driving a wide area with uniform sound quality Is difficult. Also, due to
the structure, the amplitude of the vibration can not be large, so a wide radiation area is
necessary to radiate the bass. As the radiation area becomes wider, the electroacoustic
conversion conditions greatly vary depending on the position of the radiation surface. However,
because the cost is limited and the detailed control is troublesome, the current situation is that
the conventional simple drive system is used. Since the flat speaker is thin, there are few
structural restrictions in which the speaker is installed, and coordination with the surroundings is
easy in design. Therefore, if there is a method to compensate for the sound quality defect of the
flat speaker at low cost, the application range is greatly expanded.
Definition of Terms The distribution includes not only continuous distribution but also discrete
distribution. The matrix means grid-like. The horizontal axis or row and the vertical axis or
column refer to a matrix of electrical placement and wiring, not to structural horizontal or
vertical. Further, vertical and horizontal are distinctions of convenience, and are equivalent even
if they are exchanged. The electrical state represents the characteristic or state of the output of
the power source, and means either the voltage or current output by the power source or the
output impedance of the power source.
SUMMARY OF THE INVENTION By improving the method of independently driving a large
number of speakers constituting a flat speaker, it is possible to compensate for the defect in
sound quality and to reduce the cost.
SUMMARY OF THE INVENTION The present invention relates to a method of electrically
arranging and wiring loudspeakers in a matrix, and driving a signal obtained by sampling an
original acoustic signal in a time division manner.
Due to the structure of the electrical connection, it is assumed that there are one or more rows
and a plurality of columns. The rows and columns are merely electrical wiring axes and do not
necessarily have to coincide with the spatial arrangement. Also, the rows and columns are equal
and commutative. A loudspeaker is placed at each of the electrical structural intersections where
the respective rows of rows and columns intersect. Horizontal axis wiring is provided in each of
the rows, and is connected to one terminal of each speaker. Vertical wiring is provided in each of
the columns described above, and the other terminal of each speaker is connected.
Each of the above-mentioned horizontal axis wires has a horizontal axis power supply function
group for creating an arbitrary or one-value or two-value or three-value electric state, and for
each of the above-mentioned wires an arbitrary or one-value Or, it has the vertical axis power
supply function group for creating the binary or ternary electric state, and the speaker group can
be changed by changing the state of the power supply function group of the vertical axis and the
horizontal axis sequentially. Make split operation. Control of this time division operation is
analog type, digital type, and analog digital mixed type, but all, sampling the input sound signal,
making the signal which drives each speaker with time division sequentially, power in time
division Control to supply.
The row power supply function group and the column power supply function group are provided
to time-divisionally drive the speakers at the position where the output of the row power supply
function group and the output of the column power supply function group intersect in an
arbitrary order. The time-division drive circuit, which controls the control signal, generates a
control signal for the speaker drive corresponding to the acoustic signal of the input.
By having the parameter corresponding to the variation in the characteristics of each of the
speaker groups described above, it is possible to correct the drive amount according to the
parameter, and further, to negatively affect the sound quality such as nonlinear distortion.
Improve the nature.
In addition, by having parameters corresponding to the role of individual speakers, which depend
on the structural arrangement relationship of the speaker group described above, individual
speakers should be in an optimal state according to the parameters. It can be driven.
These functions not only facilitate the production of composite speakers, but also can finely
correct non-linear distortion, which is also a weakness of flat loudspeakers, and provide optimum
driving power depending on the location of individual loudspeakers which is a weakness of flat
loudspeakers. Frequency dependency can be easily corrected, and a good flat speaker can be
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the driving method of a
composite speaker according to the present invention will be described in detail below based on
the attached drawings.
FIG. 1 is a block diagram showing an embodiment of the most general method of driving a
speaker according to the present invention.
X1, X2,..., Xj,..., Xm indicate the row numbers of the electrically arranged speakers, and indicate
the electrical wiring group on the horizontal axis.
Y1, Y2,..., Yj,..., Ym indicate the column numbers of the electrically arranged speakers and
indicate the electrical wiring group on the vertical axis. SPjk j = 1,2 ,,, mk = 1,2 ,,, n is a speaker
group, and one input of the speaker has a common vertical axis Xjj = 1, 2,. The other one of the
inputs is connected to one of the vertical axes Ykk = 1, 2,..., N.
AX1, AX2,..., AXj,..., AXm are power supply function groups for driving the horizontal axes Xj j =
1, 2,. These power supply functions generally supply an arbitrary potential or arbitrarily control
an output impedance from a plus region to a minus region. DX1, DX2,..., DXm are signals for
controlling the power supply on the horizontal axis. AY1, AY2,..., AYk,..., AYn are power supply
function groups driving vertical axes Yk k = 1, 2,. These power supply functions can supply an
arbitrary potential generally from the plus region to the minus region, or can arbitrarily control
the output impedance. DY1, DY2,..., DYn are signals for controlling the power supply on the
vertical axis. The individual speakers are time-division driven for each horizontal axis or vertical
axis. For example, SP1k k = 1, 2,..., N: power supply on the horizontal axis is from AX1 and power
supply on the vertical axis is from AYk k = 1, 2,. An on-axis speaker is driven. The axis not
connected to the driven speaker is in an electrically disconnected state.
MPX is a time division control function. The time division control function MPX receives the
input acoustic signal F (t), and the horizontal axis control signal of Dx j j = 1, 2,..., M and the
vertical line of DYk k = 1, 2,. Generate an axis control signal. Time-division control function MPX
sequentially drives m horizontal axes in ts time with one sampling cycle ts of the sound signal as
one cycle. The assignment time of the horizontal axis j = 1, 2,..., M at a certain sampling time t 1
is t 1 j j = 1, 2,,,, m. In this embodiment, at time t1j, only the power supply function of AXj is
active on the horizontal axis, and the other horizontal axes excluding the axis j are in the nonconnected state. On the other hand, the vertical axis indicates that all power supply functions of
AYk k = 1, 2,..., N are active, and the conversion function Gjk k = 1 set on each vertical axis
depending on the input F (t) The values GY jk {F (t1)) k = 1, 2,, n converted by 2, 2,. In general,
the conversion function G jk corresponding to each speaker is an arbitrary function as required.
The condition of the vibration of the speaker is largely different between the central portion and
the end portion of the speaker dispersed on the surface. The vibration range is wider at the
center of the diaphragm, so the reaction is weak, and the movement range is wider even with a
small bass signal. As the lower the frequency, the stronger the tendency, so that the central
portion is more likely to cause bass saturation. Therefore, it is desirable to change the driving
conditions depending on the arrangement position of the speakers.
The essence of the present invention regarding the transformation function is that it causes some
action, including transformation that does not transform, and it is not the essence of the present
invention which transformation is to be applied. Further, the type of time division drive and the
specific circuit type of the power supply function are not the essence of the present invention.
FIG. 2 shows a special case of the general form of FIG. 1, in which the vertical axis represents a
power supply function group for supplying an arbitrary voltage, and the horizontal axis
represents a power capable of selecting either a reference potential or no connection. It is a block
diagram which shows the Example of the most practical speaker drive part in the case of being a
switch group. Xjj = 1, 2,..., M indicate horizontal axis wiring. Yk k = 1, 2,..., N indicate vertical axis
wiring. SP jk j = 1, 2,..., M k = 1, 2,. SPjk k = 1, 2,..., M is a speaker group connected to the
horizontal axis j. SP jk j = 1, 2,..., N is a speaker group connected to the vertical axis k. AX j j = 1,
2,..., M is a power switch group that selects either the reference potential or the disconnection of
each horizontal axis. DXj j = 1, 2,..., M are control inputs of the power switch group AXjj = 1, 2,.
AYk k = 1, 2,..., N is a power supply function group for supplying an arbitrary potential. DYk k =
1, 2,..., N is a control input for controlling AYk k = 1, 2,. In the power switch group AXj j = 1, 2,...,
M, the connection state is switched sequentially. The potentials to drive the respective speakers
are supplied by AYk k = 1, 2,..., N to the speaker groups SPjk k = 1, 2,. The connections on the
horizontal axis are switched sequentially, and in each case the power supply to the speakers to
be driven is supplied by DYk k = 1, 2,. The connection of the horizontal axis does not necessarily
have to be one cycle, one axis, and may be a one cycle, multiple axis drive. The detailed operation
is the same as the description of FIG.
FIG. 3 is an illustration of time division of an input signal. The horizontal axis t indicates the
passage of time, and F (t) indicates the change of the input signal. t1, t2 and t3 indicate sampling
times. The outputs of F (t) at sampling time t1 are F (t1), F (t2) and F (t3), respectively. The
sampling period is ts. One sampling period is divided by the number m of the horizontal axis. The
number of divisions does not necessarily have to be m. Also, depending on the conditions, it may
be possible to drive multiple axes simultaneously. In order to simplify the explanation, the
division number of the horizontal axis is m. The drive time given to each horizontal axis of the
sampling timing t1 is t1j j = 1, 2,. The drive time per horizontal axis is td. At time t11, X1 is in the
connected state, the other is in the non-connected state, at time t12, X2 is in the connected state,
the other is in the non-connected state, and at time t1j, Xj is in the connected state, and the other
is in the non-connected state. The vertical axis power supply function group AYk k = 1, 2,... N
supplies required signals to the horizontal axis speakers connected at each time, and the
horizontal axes connected move sequentially As the power supply of each vertical axis is
changed. The m * n speakers can be driven with m horizontal switch functions and n vertical
power supply functions.
Brief description of the drawings
FIG. 1 is a block diagram of one embodiment of the most general approach of the speaker driving
FIG. 2 is a block diagram of an embodiment of a practical approach in the case of driving each
speaker in an unbalanced manner and independently and sequentially driving each row speaker
FIG. 3 shows a timing relationship with time division drive signals.
Explanation of sign
F (t) Input audio signal Input Input audio signal Mpx Time-division drive control unit ts Timedivision drive sampling period td Time-division drive 1 cycle DXj j = 1, 2,, m m Horizontal axis
drive control signal DYk k = 1 , 2, ..., n Vertical axis drive control signal AXj j = 1, 2, ..., m
Horizontal axis power supply unit AYk k = 1, 2, ..., n Vertical axis power supply unit Xj j = 1 , 2, ...,
m Horizontal axis wiring Yk k = 1, 2, ..., n Vertical axis wiring SPjkj = 1, 2, ..., mk = 1, 2, ..., n
Speaker t1j j = 1 , 2, ..., m Control slot time Gyjk {F (t1)} on the horizontal axis j at the time San
o'ring time t1 j = 1, 2, ..., mk = 1, 2, ..., n Horizontal axis For driving a speaker connected to j and
the vertical axis k, the variation of the input signal F (t1) at the sampling time t1 is Indicates that
a function, representative of the control signal of the vertical axis power supply of the time slot.
Vsss represents that the time slot is connected to the reference potential Vss.
Open Indicates that the time slot is disconnected.
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