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Specification 1, title of the invention]
Device for changing the spatial characteristics of loudspeakers
6, The present invention relates to the changing spatial characteristics of loudspeakers, in
particular the first reflective surface reflecting more acoustic energy than a loudspeaker such as
BO8E901O8-S emits directly to the listening area After emitting to the listening area, a
progressive device is used to change the spatial characteristics of the loudspeaker that enhances
the listening effect by using a relatively uncomplicated and easy to operate configuration by
radiating to the listening area. The BO8E901 loudspeaker system implements the invention
patented in US Pat. No. 3,582,553 and is an award-winning series that has been well received by
professionals and consumers worldwide Received EndPage: 2 came. The 901 system uses a
single driver on the front panel to radiate very little acoustic energy directly into the listening
area to radiate acoustic energy first to the reflective surface and then to the listening area. It
includes a pair of adjacent rearwardly angled panels filled with loudspeakers, such as in-phase
coupled, operating over a wide frequency range. An associated effective equalizer cooperates
with the loudspeaker to provide a system characterized by substantially equal radiated energy
response as a function of frequency over substantially the full range of audio frequencies. This
system simulates the listening sound in a concert hall where the audience receives much more
reflected energy than the direct energy from the on-stage sound source. The audience perceives
a relatively wide acoustic image as if the audio source originated from the entire surface of the
wall adjacent to the loudspeaker cabinet. The change in acoustic energy is achieved by the
change in angle between the panel and the adjacent wall. For example, this perceived image is
moved closer to the center by rotating the cabinet so that the angle between the outer back panel
and the facing wall is small and the angle between the inner back panel and the facing wall is
large It is possible. Conversely, if the former angle is increased and the latter angle is decreased,
the perceived image moves further outward. This physical movement provides some control of
the perceptual image, but in many situations, such as when the loudspeaker is suspended from
the ceiling, such as when the listener wants to change the perceptual image until the listener
chooses It is not practical. Furthermore, the degree of image change is constrained in some way.
Accordingly, an important object of the present invention is to provide an improved device for
changing the spatial characteristics of the loudspeaker by electrical means.
Another object of the present invention is to achieve the above object using a loudspeaker of the
BO8 E901 loudspeaker system type. Yet another object of the present invention is to achieve one
or more of the above objectives over a relatively wide range with a single control that can be
easily manipulated by an untrained listener. Another object of the present invention is to achieve
one or more of the above objects without changing the volume. Yet another object of the present
invention is to achieve one or more of the above objects by attaching another reliable and
relatively inexpensive relatively small device. According to the invention, spectral components
above a predetermined high frequency above a low frequency range such as 200 Hz for the first
and second ends respectively connected in series between the first and second human power
terminals Connecting a sixth terminal to a junction between the first and second loudspeaker
drivers, the first and second high frequency loudspeaker drivers emitting high frequency audio
energy, A device is provided for coupling a potentiometer between the one and the second
terminal, and a device for coupling the branch of the potentiometer to the third terminal. Devices
coupling a potentiometer to the first and second terminals are electrically coupled to the first and
second amplification devices for delivering electrical energy to the devices emitting the first and
second high frequencies, respectively. It is desirable to have first and second amplification
devices that provide energy. Device for coupling the arm of the potentiometer to the sixth
terminal [having a capacitive device for attenuating DC and relatively low frequency signals.
Many other features, objects and advantages of the present invention will become apparent upon
review of the following description in connection with the accompanying drawing figures. In the
attached drawing, in particular FIG. 1, a plan view is shown showing a room including a listener
11 and left and right loudspeakers 12.13 for reproducing the left and right stereo channels
respectively. The loudspeaker 12.13 is a commercially available BO3E 901 series cabinet. As
shown in FIG. 1, substantially the same acoustic energy is also emitted from the inner panels 121
and 161 as it is emitted from the outer panels 120 and 130. At this time, the listener 11
perceives an EndPage: 3 acoustic image which results in being substantially evenly distributed
over the rear wall 14. In FIG. 2, the loudspeakers 12 and 13 radiate more energy from the outer
panels 120 and 130 than the inner panels 121 and 131 so that the listener 11 is generated
outside the loudspeakers 12 and 13 A top view is shown showing the perception of a relatively
wide acoustic image by the key parts of the sound that appear to be.
In FIG. 3, the system according to the invention is arranged to emit more acoustic energy to the
inside than the outside of the wall 14 so that the listener 11 is in some music such as a solo
performance. On the other hand, the top view which shows the case where the acoustic image in
the position near the center part of the desirable wall surface 14 is perceived is shown. Referring
to FIG. 4, a diagram illustrating a preferred form of driver connection according to the present
invention is shown. The outer panel 120 has four drivers 21 to 24, the inner panel 121 has four
drivers 25 to 28, and the front panel 30 has one front driver 29. The drivers 21-28 are
connected in series with a front driver 29 connected in series between the outer drivers 21-24
and the inner drivers 25-28. The nine drivers are connected in series between the junction of the
front driver 29 connected to the central terminal 36 and the inner rear driver 25 and the outer
terminal 1 and the inner terminal 32. In FIG. 5, the spatial control unit is combined with the filter
so that the spatial control unit 41 becomes effective at frequencies higher than 500 Hz, and the
sound emitted by all the drivers is lower than 500 Hz with almost no directivity. FIG. 5 shows a
combination block diagram of a preferred embodiment of the present invention having little
influence on relatively low frequency spectral components to receive approximately the same
energy. The spatial control 41 controls the ratio of the inner radiation to the outer radiation
according to the position of the arm 42 with respect to a predetermined high frequency spectral
component on the system, but the total energy response of the system is substantially changed
The radiant energy response, as a function of frequency, is substantially uniform, regardless of
the position of the arm 42 of the space control 41. The left channel signal at input terminal 44 is
amplified and applied to the + and-output terminals 45 and 46, respectively, but the lower
frequency components are opposite in phase and have substantially the same amplitude. For this
purpose, the left channel signal of the human power terminal 44 is for the inner channel
consisting of the amplifier 47, the resistor 48 of value R1 and the power amplifier 51, and also
the resistor 5 of amplifier 52 and value R2. Applied to the outer channel of power amplifier 54,
the gains of amplifiers 47 and 52 are the same in magnitude and opposite in direction to provide
the desired phase inversion. A capacitor 55 of value C grounds the arm 42 of the potentiometer
31 of the resistor R. The middle terminal filter of loudspeaker system 12 is grounded via terminal
In FIG. 6, the frequency response characteristics of the inner and outer banks of the driver with
the largest outer channel boost centered on the potentiometer arm 42 are shown. The curve 61
shows that when the arm 42 is at the center position, the responses are both substantially equal.
Curve 62 shows the boost in the response of the outer bank, and curve 6 shows drop indications
in the response of the inner bank of the driver. The responses 65 and 62 are reversed when the
arm 42 is moved to the maximum inner boost position. Assuming a maximum gain A of about
3aB, the total power from the closed housing at any frequency will change the position of the
arm 42 to produce only a perceived image change without audible changes in volume, so It is
constant. A typical half power frequency or hinge frequency is on the order of 300 Hz,
substantially determined by resistors R1 and R2 (generally equal to R6), R-filter and capacitor C.
Typical values for resistors R1 and R2 are 2.7 ohms, potentiometer R5 is 5 ohms, and capacitor C
is 0.22 microfarads, producing hinge frequencies (3aB drop) on the order of 250 Hz at maximum
cut. The invention has many advantages. By operating the control unit 41 without changing the
volume, the listener can easily control EndPage: 4 properties of the perceived image. The desired
substantially even radiated power response is retained as the perceptual image is changed. At
low frequencies, where most power is required, all listeners produce treble levels without
producing approximately equally audible distortion and without affecting the ability to selectively
change the perceived image. Focus on strengthening the ability. Control of the perceived image
can be disabled by opening the connection to the arm 42 of the potentiometer. This is converted
to a balanced control of the flat frequency response over the entire frequency range between the
inner output 45 and the outer output 46 by shorting the capacitor 55. In this feature, separate
enclosures or speaker systems are connected to the inner and outer outputs 45. 46, respectively,
so that the control functions as balanced control over the entire frequency range. It is also within
the principles of the present invention to drive different sections of the a-unit loudspeaker
enclosure using more complex systems, such as using higher order sections, delay networks and
non-linear processing.
The invention can be used immediately for connection to a BO8E901O8-s loudspeaker already
having three terminals. The present invention can also be used with the Father, a commercially
available BO8E 501.601 loudspeaker. A commercially available 501 loudspeaker has a woofer,
an inner radiating tweeter and an outer radiating tweeter. The woofer is connected to both ends
of the inner and outer terminals. One capacitor constituting the inner radiation tweeter crossover
network is connected between the inner terminal and the middle terminal. The capacitors that
make up the outer radiating tweeter and the crossover network are connected in series between
the outer terminal and the middle terminal. These capacitors are substantially equal and have
approximately twice the capacitance of the crossover network associated with the 501 system
having two input terminals. The 顛 601 loudspeaker system has two woofers, a pair of inner
radiating tweeters, and a pair of inner radiating tweeters. The two woofers are connected in
parallel between the inner and outer terminals. The inner tweeter is connected in series or in
parallel between the inner terminal and one of the capacitors forming the crossover network
connected to the intermediate terminal. The outer tweeter is connected in series or in parallel
between the outer terminal and one capacitor forming a crossover network connected to the
middle terminal. In these commercial implementations, the image control is better than in the
BO8E901 loudspeaker system, as the low frequency cutoff of the towter is much higher than that
of the full frequency range driver in the BO8E901 loudspeaker. Not remarkable. The above
described technique using a woofer / tweeter combination results in improved spatial control
using a tweeter with high power in the range of 250 to 500 Hz. It will be apparent to those
skilled in the art that many modifications and applications are possible from the specific
embodiments described herein without departing from the inventive concept.
4. Brief description of the drawings] FIG. 1 to FIG. 3 are plan views showing energy paths to the
respective mainly main and outer inner perception images of the system adjusted according to
the present invention, and FIG. FIG. 5 shows the interconnection of the terminals, FIG. 5 is a
combined block circuit diagram of the system according to the invention, and FIG. Is a graph
showing the transfer function for. 11 ... listener, 12.1? ... loudspeaker, 14 ... wall surface, 21-29 ...
drive device, EndPage: 5'50 ... front panel, 51 ... outside terminal, 2 2 · · · inner terminal, ろ ...
intermediate terminal, 41 · · · space control unit, 42 · · · arm, 47.52 · · · · 48.5 resistance · · ·
resistance , 51.54 ... power amplifier, 55 ... capacitor, 120.150 ... outer panel, 121.161 ... inner
panel. Patent Assignee Bose Corporation-Attorney Attorney Yusuke Yuasa 's-(External Name)-FIG,
IFIG, 2 FI 6.4 End Page: 6
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