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DESCRIPTION JPS55112097

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DESCRIPTION JPS55112097
Description 1, title of the invention
Sound system
3. Detailed Description of the Invention The present invention detects the distortion component
in the sound output radiated from the speaker unit, provides a feedback control system using the
detection output signal, and reduces the distortion component. About the system. In general, a
speaker unit that converts an electrical signal into an acoustic signal and outputs the distortion
component includes distortion components due to divided vibrations of the diaphragm,
nonlinearity of an edge member or the like supporting the diaphragm, and nonlinearity of driving
force applied to the diaphragm. In order to reduce the distortion component in the speaker unit,
the shape or material of the diaphragm, the edge member, etc. to radiate the acoustic output
including the distortion component caused by the nonlinearity of the unit itself such as the
distortion component due to Although various attempts have been made, such as the above, it
has been impossible to sufficiently reduce the above-mentioned distortion component. Therefore,
the present invention provides a signal addition circuit that mixes an original signal and a
feedback signal in reverse polarity, an amplification circuit that amplifies the output signal from
the signal addition circuit, and a speaker unit driven by the output signal from the enhancement
circuit. And a microphone unit that outputs an electrical signal proportional to the sound
pressure of an acoustic signal radiated from the speaker unit, and a distortion component of the
acoustic signal is extracted by comparing the output signal from the microphone and the original
signal. A speaker unit having non-linearity is provided by using an acoustic system including a
comparison operator and providing an output signal from the comparison operator as the
feedback signal to the addition circuit to supply EndPage: 1. However, the present invention
provides an acoustic system with a novel configuration that can obtain a good acoustic output
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with very low sound quality with a distortion component. Hereinafter, the present invention will
be described in detail according to the drawings showing one embodiment. FIG. 1 is a block
diagram showing the configuration of an embodiment of an acoustic system according to the
present invention. In this embodiment, the original electrical signal converted into an acoustic
signal by the speaker unit 1 is supplied from the signal input terminal 2 to one input terminal 3 a
of the signal addition circuit 3 and one input terminal 4 a of the comparison operation circuit 4.
ing. The signal addition circuit 3 adds and mixes the feedback signal supplied to the other input
terminal 3b and the original signal supplied to the one input terminal in reverse polarity, and the
combined output signal is added to the power amplification circuit 5 Supply to The power
amplification circuit 5 amplifies the composite output signal from the signal addition circuit 3
with a predetermined gain, supplies the amplified output signal (3) to the voice coil 1 a of the
speaker unit 1, and To drive. A microphone unit 6 is disposed on the front side of the speaker
unit 1 at an appropriate distance T from the diaphragm 1b.
The microphone unit 6 receives the sound output radiated from the speaker unit 1 driven as
described above, and outputs a detection signal of a signal level proportional to the sound
pressure. Here, the microphone unit 6 is disposed on the front side of the speaker unit 1 with an
appropriate distance T, so that the sound pressure of the acoustic output substantially includes
all distortion components due to non-linearity of the speaker unit 1 itself. A detection signal of a
proportional signal level can be output. Although one microphone unit 6 is disposed on the front
side of the speaker unit 1 in this embodiment, the number of microphone units 6 may be plural.
The detection signal from the microphone unit 6 is corrected by the circuit 7 etc. for phase
change etc. between the electric signal and the acoustic signal (4) on the electro-mechanical
conversion operation characteristic in the speaker unit 1, and further level adjustment After
being set to an appropriate signal level by the variable resistor 8, the signal is supplied to the
other input terminal 4 b of the comparison operation circuit 4. Then, the comparison operation
circuit 4 compares the level of the original signal supplied to one input terminal 4a with the
detection signal supplied to the other input terminal 4b, and subtracts the original signal from
the detection signal. Thus, the distortion component contained in the sound output radiated from
the speaker unit 1 is extracted. An output signal from the comparison operation circuit 4 is set to
an appropriate signal level by the level adjustment variable resistor 9, and is supplied to the
other input terminal 3b of the signal addition circuit 3 as a feedback signal. Here, the equivalent
circuit 7 and the variable resistor 8 are arranged to perform the comparison operation of the
original signal and the detection signal in the comparison operation circuit 4 under the condition
of 1 = 1. Therefore, in the embodiment as described above, the distortion component due to the
non-linearity of the speaker unit 1 itself contained in the sound output radiated from the speaker
unit 1 is compared with the original signal and the detection signal The distortion component is
reduced by the operation of the feedback control system which takes out by calculation and
feeds back in the opposite phase to the input side of the power amplifier 5 for driving the
speaker unit 1, and an acoustic output with very good sound quality Is obtained. It should be
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noted that instead of arranging the microphone unit 6 at an appropriate distance T on the front
side of the above speaker unit 1, instead of arranging the mechanical / electrical conversion
element directly on the coil bobbin or diaphragm of the speaker unit, It is also possible to detect
the distortion component due to the non-linearity of the sensor, but in this case it is possible to
detect only the distortion component of only the local part where the mechanical-electrical
conversion element is disposed. As a result, it is extremely difficult to comprehensively detect
and reduce distortion components generated in divided vibrations and edge portions of the
diaphragm.
On the other hand, in the above embodiment, since the sound output including substantially all
distortion components radiated from the speaker unit 1 is detected by the microphone unit 6, the
distortion component (6) EndPage is comprehensively : 2 can be reduced. In addition, the
speaker unit 1 itself does not require any processing, and various speaker units such as a cone
type speaker, a flat panel speaker, a horn type speaker, an electrostatic type speaker, etc. It is
possible to sufficiently reduce distortion components due to the nature. According to the present
invention, as is apparent from the description of the above embodiment, the microphone unit
detects the sound output radiated from the speaker unit, and the feedback control system using
the detected signal detects the nonlinearity of the speaker unit itself. It is possible to sufficiently
reduce the distortion component caused by the above, to obtain an extremely good sound output
with various sound quality from the various speaker units, and to achieve the intended purpose
sufficiently.
4. Brief Description of the Drawings FIG. 1 is a block diagram showing a configuration of an
embodiment of an acoustic system according to the present invention. 1 · O · speaker unit 3 · · ·
signal addition circuit (7) 4 · · · comparison operation circuit 5 · · · power increase (-circuit 7 · · ·
microphone unit 11th mEndPage: 3
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