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JPH02280600

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DESCRIPTION JPH02280600
[0001]
TECHNICAL FIELD The present invention relates to a non-speaker non-J-type distortion
preventing device for preventing non-s-type S-type distortion of a speaker by subtracting a signal
whose band is limited by an input circuit with an input 100. . 2. Related Art There are a number
of speakers that use sound #d like pack-loaded horn speakers. By the way, in such a speaker,
there is a region where the sound 1 impedance is small, so that the amplitude becomes too large
to generate non-1w distortion. Conventionally, to prevent this, the graphic equalizer has only to
be used to adjust the level of the area where the sound 1 inbida / s becomes smaller or to use it
at a level ? where non-linear distortion does not occur. SUMMARY OF THE INVENTION
However, in the configuration using the graphic equalizer as described above, the level
adjustment by the graphic equalizer is performed even to a signal not higher than the level at
which S-type distortion occurs. Further, in the case where the graphic equalizer is not used, it can
not be used only at a level at which non-linear distortion occurs and therefore, a large output can
not be obtained. The present invention solves the above-mentioned problems, and only when the
signal of the frequency band generating non-lI distortion of the speaker becomes equal to or
more than the level generating non-Jl distortion It is an object of the present invention to provide
a speaker non-5J distortion prevention device capable of preventing occurrence of non-linear
distortion even at high power by adjusting the A / A. Means for solving the problem, in order to
achieve this object, the speaker nonlinear distortion preventing device l of the present invention
is configured in parallel with the first delay device for delaying the input signal 9t and delaying
the first delay device. And a second delay unit for delaying the signal from the filter circuit and a
level / l / an for the signal from the second delay unit. Of the level A / tuning ts, and the repee / I
/ l * output circuit for detecting the signal from the filtering circuit by configuring in parallel with
the second delay device, and the level detector An input distortion level determination circuit that
determines whether the output is in a non-linear region of a speaker that is vertical and d to the
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present device, and a first level lv regulator according to a signal from the input distortion level
determination circuit Control the first level, ii iJ unit, iJ 60 circuit, and first delay unit A
subtractor for subtracting the signal of the first level / V regulator from the signal, the vertical to
the present device,! ?? J, the amplifier input sensitivity input circuit which sets the input
sensitivity of the power amplification 4 to be a tiger, the vibration custom measurement device
which measures the vibration characteristic of the speaker, and the nonlinear distortion
characteristics of the cisbee force by the signal from the vibration custom measurement device
Measure and compare the measurement, signal and amplifier input, sense, signal from ffi input
circuit and generate control signal according to the characteristic measured by comparison
circuit and input distortion level judgment circuit. The circuit comprises a speaker non-linear
distortion characteristic measurement circuit, and a measurement changeover switch for
switching the signal from the speaker non- and the trapezoidal distortion characteristic
measurement circuit and the signal from the subtractor.
Operation According to the above configuration] The operation of the present invention is as
follows. The output of the speaker's nonlinear distortion characteristic measurement circuit is
vertical J! Switch to output to the power amplifier. Then, a reference signal is output from the
non-speaker, linear distortion characteristic measurement circuit, and reproduced by the speaker
that is read by the power amplifier in the vertical direction. The vibration characteristic is
detected by a vibration custom measuring instrument and input to a speaker nonlinear distortion
characteristic measurement circuit. At this time, the level of the reference signal is increased if
non-type 1a distortion does not occur in the vibration ratio, and the frequency of the reference
signal is changed when the value set by the amplifier input sensitivity input circuit is increased.
However, if S-type distortion occurs before the reference + f signal level is increased to the value
set by the amplifier input sensitivity input circuit, the source of that station a and the level is
output to the filter circuit and the input distortion level determination circuit . Then, the
frequency of the reference signal is changed again, and the same thing is returned to A. From the
above, it is possible to measure the non-; wedge-shaped distortion characteristics of the cis-bee
force. When the measurement is completed, the measurement selector switch is switched to the
subtractor side. The filter circuit can pass only the signal in the S-shaped distortion region by the
information from the speaker non-linear distortion characteristic measurement circuit, and its V
? is detected by the repe lv detector, and the input distortion level Input to the judgment circuit.
Since the input distortion repe 1vlJ constant circuit has a level at which non-square distortion is
generated in advance by the information from the speaker non-linear distortion characteristic
measurement circuit, it is possible to set the repe / I / fI1. It can be determined whether the
signal from the emitter exceeds its set value, and the result of the determination is input to the
first repe / l / regulator control circuit. ! The level adjuster-e control circuit of 1 outputs a control
signal corresponding to the signal from the input distortion level determination circuit to the first
repeat / I / J adjuster to adjust the amount of attenuation. Then, the signal band-limited by the
filter circuit is level / L 'adjusted by the first repe / L / regulator and subtracted from the input
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signal by the subtractor. As a result, it is possible to prevent the occurrence of non-J-type
distortion due to signal repe / l / t- @ d in the frequency range where nonlinear distortion of the
speaker occurs. Furthermore, the second delay circuit may correct the time required for the
signal band-limited by the feedback circuit to be signal-processed by the level detector and the
input distortion level determination circuit and the level adjuster @ ? circuit. Similarly, the isl
delay can also compensate for the time required for the input signal to be input to the subtractor
through the filter circuit.
Implementation Row One implementation row of the present invention will be described with
reference to the drawings. The first shows the configuration of the speaker non-destructive
distortion preventing apparatus in one embodiment of the present invention. In FIG. 1, 1 is an
input terminal, 21 to 20 is a delay device, 3 is a low pass filter (hereinafter simply referred to as
IIpy), 4 is a band pass filter (hereinafter simply referred to as BPF) 6 & ~ 6b is a cutoff frequency
1-circuit , 81 to 6 G: rehe / 1 / regulator, 71L to 7b: rehe / I / l * output device, 8a to 8b: input
distortion level judging circuit, 91L to 9c: repe lv adjustment its circuit-1o: Subtractor, 11 is a
signal generator, 12 is a signal generator,! 1 Jia 1 circuit, 13 is a speaker non-a type distortion
run circuit, 14 is an amplifier output distortion determination circuit, 15 is an amplifier input
sensitivity input circuit, 16 is a distortion detection circuit, 1T is a microphone, 18 is a
measurement switch, 19 is an output terminal , 2 o is a power amplifier, 21 is a speaker. First, in
order to investigate the egg-wheat distortion characteristic of the speaker 21, the measurement
change-over switch 18 is switched to the level adjuster 6c1i11 to be in the "measurement mode".
Then, an amplifier 200 ┼ power sensitivity is set in the amplifier input sensitivity input circuit
15. After setting as described above, the signal generator 11 generates a quasi-signal and adjusts
the level / L 'adjustment 56o. The reference signal is 44 by the amplifier 20 and reproduced by
the speaker 21. Then, the reproduced sound is collected by the microphone 17, and the
distortion detection circuit 16 measures whether or not non-Ii distortion has occurred, and sends
the information J to the speaker nonlinear distortion determination circuit 13. On the other hand,
the output of the level adjustment 44eo is input to the amplifier output distortion determination
circuit 14, where it is measured whether it exceeds the speed set by the amplifier input
sensitivity input circuit 16 and the information is sent to the speaker nonlinear distortion
determination circuit 13. Then, the non-i type distortion is not generated from the distortion
detection circuit 16 when the speaker non-1s distortion determination circuit 13 receives
information from the amplifier output distortion determination circuit 14 that ?the set value is
not exceeded?. When the information is received, the speaker non-linear distortion
determination circuit 13 sends information to the level regulator control circuit 9 o ?Make the
attenuation ambiguity of the level adjustment disc smaller?, and the output of the level
regulator 60 is increased. Next, when receiving information from the amplifier output distortion
determination circuit 14 that ?the value exceeds the set value?, + 49Ayz <in the information
from the distortion detection circuit 16, the non-speaker and glandular distortion determination
circuit 13 are signal generator control circuits 12. The information "Change the frequency of the
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reference signal of the signal generator 11" is sent to change the frequency of the reference
signal, and at the same time, the information "return to the original level" is sent to the level
regulator control circuit 9C. Return the signal to its initial level and make measurements at that
frequency.
Then, when the information that "the set value is not exceeded" is received from the amplifier
output distortion determination circuit 14 and the information that "overlap distortion is
occurring" is received from the distortion detection circuit 16, the speaker non-linear distortion
determination is made. The circuit 13 a [i! ?? The signal is sent to the frequency loss control
circuit 51LN 5b, and the level information thereof is sent to the input distortion level
determination circuit 8 & Nab. Thereafter, it instructs the signal generator control circuit 12 to
change the frequency, and instructs the level regulator control circuit 9 ░ to return the original
V lvK. The non-linear distortion characteristic of the speaker is measured by repeating the above.
When the measurement is completed, the measurement cut beauty switch 18 is switched to the
subtractor side to be in the "music mode". First, the input signal from the input terminal 1 is
input to the week A 2 & and the LPF a and BPF 4. ?????????? L P F s (D amplitude 46
ta 4 I al (-reso second factor, as shown in the third factor). ????? Is the respective cutoff
frequency. Here, the non-J-type distortion of the speaker will be described with reference to (1).
The non-jl distortion is a 4IK problem with a speaker using a sound # tube such as a pack load
horn, so here we will describe a speaker using a sound 1 tube. FIG. 4 shows the amplitude
frequency characteristics of the speaker. In a speaker using four sound tubes, there is a
frequency at which the sound pressure is close to zero. In FIG. 4, f4 or less and f, ~ f6 correspond
to this. Therefore, in this frequency band, the amplitude increases even if the input applied to the
speaker is small. When the level exceeds the level, the amplitude becomes too large to generate
an egg-fold distortion. Tsumasi 4th Li! A non-single wedge distortion occurs at an amplitude of 0
or more of l. It is FIG. 6 that this is replaced with one relation between the input power to the
speaker and the distortion factor of the speaker output. In a signal of tbr4 or less, or f, to f6,
linear distortion occurs when the input power is PL-4. Here, f in FIG. 2 is matched with f, f with
f6, and the third factor f with f4. Further, since f4 to f6 are changed by the speaker 71C to be
combined, the information is inputted to the airr frequency input circuit 6, and f to f are changed.
Next, the signals band-limited by the LPFa and BPF 4 are input to the delay units 2b to 2C and
the V detector 7a to 7b. The level detectors T & -7b detect the level of the band-limited signal
and input the same to the input distortion level judging circuits 81-8b.
Here, it is determined whether or not the value set by the speaker eggshell type distortion
determination circuit 13 is exceeded, and the attenuation ? is maximized (-Cl3) so as not to be
output from the level adjusters 61 to 6b if not exceeded When it exceeds, 1 @@ signal
corresponding to the level is generated from the level adjuster / flJi1 circuit 9a, and the output
levels of the level adjusters 61L to 6b are Am. FIG. 6 is a diagram showing the IA relation of the
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output signal to the input signal of the level adjusters 6-8 b. Here, the level controller 6 corrects
the time required for the band control signal to be processed by the delay units 2b to 2C from
the level detection 57a to 7b to be processed by the V bell regulator control circuits 9 & 9b. !
Input L to 6b. Then, the output of the level wart ae & ~ 6b adjusted as described above is inputted
to the subtractor 1Q. The delay unit 2a corrects the time required for the input signal to be input
to the subtractor 10 through the LPF 3 BPF 4. Then, the output from the delay unit 2 & is input
to the subtractor 10 and is subtracted from the outputs of the level adjusters 6N to 6b. FIG. 7
shows the amplitude frequency characteristic of the output signal of the subtractor 1o. a is a
signal at a level at which non-linear distortion of the speaker 21 does not occur, b is a signal that
begins to be generated, and c Nd is a signal at a level at which it occurs. Thus, the frequency does
not exceed the level at which the nonlinear distortion starts to occur at f4 or less and at f5 to f.
FIG. 8 is a diagram showing this in the amplitude frequency characteristic of the speaker 21. In
FIG. As described above, according to the present embodiment, the input sensitivity of the power
amplifier 20 can be set by the amplifier input sensitivity input circuit 15, and the speaker
nonlinear distortion determination circuit 13, the amplifier output distortion determination
circuit 14, and distortion detection By providing the circuit 16, the microphone 17, the signal
generator 11, the signal generator control circuit 12, the level adjuster 60, the level adjuster
control circuit 9C, and the measurement switching switch 18, the nonlinearity of the speaker 21
is obtained. The distortion characteristics can be measured, and the results can be set in the cutoff frequency control circuits 5a to 6b and the input distortion level determination circuits 8 &
8b. From the above, it is possible to combine with the 44 power amplifiers 2 o and the speakers
21. Then, by adjusting the levels of the dPF 4 and the output of the LPF 3 by the level adjusters
6a to 6b and subtracting this from the input signal by the subtractor 1o, non-uniform distortion
of the cisbee force 21 can be prevented. In addition, the signal of the non-one glandular
distortion region of the speaker 21 included in the system input signal can be detected by the
frequency filters PF3 and BPF4, the afr frequency control circuits 6a to 6b and the level
detectors 7a to 7b, whereby the input distortion level determination circuit It is possible to
determine in 8a-8b whether or not it is a level that causes non-linear distortion, and in response
to that information, control signals can be generated so that the level regulator control circuits
91-9b do not generate non-linear distortion.
Furthermore, the time spent in signal processing can be corrected by the delay devices 2a to 2C.
Hereinafter, other embodiments of the present invention will be described with reference to the
drawings. FIG. 9 shows the construction of another embodiment of the present invention, which
is a non-speaker type and an anti-anode strain device. In FIG. 9, 22 is an input / terminal, 231L23b is a delay device, and 241L--24b is LP? , 25 & ~ 2sb BPF, 26 & ~ 26b cutoff frequency
control circuit, 27 & ~ 270 level adjuster, 28IL ~ 28b Lehe / L 'next out! , 29 "to 29 b d input
distortion knowledge determination circuit, 30 & 300 is a level regulator control circuit, 31 is a
subtractor, 32 is an amplifier input sensitivity input circuit, 33 is an amplifier output distortion
determination circuit, 34 is a speaker non- 36 is a signal generator control circuit 36 is a signal
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generator control circuit 37 is a distortion detection circuit 37 is a microphone 39 is a
measurement switch, 4 o / i output terminal 41 is a power amplifier 42. ????????? In
this embodiment, four delay units 20 to 2C in the previous embodiment are operated just before
the delay unit 21L, and the LPF 241L and BPF 2B & are newly provided and the input thereof is
from one stream of two delay units 23 and 23b. The outputs of the level adjusters 271L to 27b
are input to the level adjusters 271L to 27b. ??????????????? LPF 241 & and
LPF 24b have the same characteristics, BPF 25b and LPF 24b filter signals in the frequency band
causing non-linear distortion, whereby the level detector 28 & ~ 2ab to repe) V-regulator The
control circuits 30a to 3ob play a role of generating control signals. In addition, the signal that is
banded with the memory PF24 + L and the BPF 251 L, @ sloped, is the level adjuster 27 + L ~ 27
bil? : Level will be adjusted. Then, the delay unit 231 corrects the time required until the control
signal is generated by the signal banded or canceled by the LPF 24 b and the BPF 25 b, and the
delay 1523 b is subjected to level adjustment and subtraction 431 of the band-limited signal by
the LPF 24 & 8P7252L. Correct the time required to be input to The other envelopes are the
same as in the previous embodiment. As described above, according to this embodiment, the
delay unit 23a and the LPF 24k1. By providing the BPF 25b, a control signal is generated in the
V adjustment control #ports 30 & 30b by the signal band-limited by the LPF 24b and the BPF
25b, and the time necessary for the signal processing is corrected by the delay unit 231L. Can.
In addition, since the delay is applied to the input signal 751 instead of the band-limited signal as
described above, only one delay is required. Although one LPF and one BPF are used in this
embodiment, the number may be adjusted according to the special music of the speaker. At that
time, the level / L / detector, the level adjuster, the input distortion level determination circuit,
and the repe / l / regulator control #J circuit are similarly adjusted. Although the BPF is a filter
having five bands, a love frequency and a high cut-off frequency, it is assumed that an n-th pair
(n is a positive integer) BPF may be realized by Ao and a digital circuit of this embodiment. With
the LPF, BPFt-direct, and glandular phase filters, no phase difference occurs at the time of
subtraction. Also, one microphone is used, but if you have a ? or ?, the distortion detection
circuit can take an average to avoid the influence of standing waves. The present invention can
measure the non-linear distortion characteristic of a speaker by providing a vibratory force
characteristic measuring instrument, a speaker non-linear switch, a linear distortion measuring
circuit, an amplifier input, and an ell inlet circuit measurement switch. , And it can be combined
with other power amplifiers and speakers. Also, by providing the filter circuit, the first level
regulator, the level detector, the input distortion level determination circuit, the level regulator
control circuit, and the subtractor, the number of harmonics that generate non-square distortion
of the speaker It is possible to prevent non-linear distortion from occurring even at the time of
large output, only when the signal of the band becomes equal to or higher than the level that
generates egg-like distortion. Furthermore, by providing the first delay unit and the second delay
unit, it is possible to realize a number of immersed speaker egg type distortion prevention
devices, such as being able to correct the time difference caused by the signal processing 4. is
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there.
[0002]
Brief description of the drawings
[0003]
The tenth is a block diagram showing the configuration of the speaker non-linear distortion
preventing device in one embodiment AK of the present invention, and FIG. 2 is BPi?
The amplitude and frequency characteristics of 4 waves, Fig. 3 shows the amplitude frequency
characteristics of I and PF, Fig. 4 shows the vibration and drought frequency characteristics of a
speaker using 4 sound tubes, and Fig. J6 is the speaker's power and distortion factor
Characteristic diagram, Fig. 6, Fig. 7 Input signal vs. output signal characteristic diagram of v
regulator, Fig. 7 is characteristic diagram of amplitude 4 wave at output of loudspeaker nonlinear distortion preventing device, Fig. 8 is speed, non-force FIG. 9 is a block diagram showing
the configuration of the speaker non-linear distortion preventing device in another embodiment
of the present invention when the linear distortion preventing device is used, FIG. 1.22 и и и и и и и и и
Input terminals, 21-2c, 231L-23b и и и и и и Delay device, 3.24a-24b и и и и и и и и и и и и и и "LPF", 4.251L25b и и и ... BPF, 5 turtles ~ 6b и 261L ~ 28b ... ... ... cutoff frequency control circuit, 61 ~ act 27a ~
270 ... и и и Level adjuster, 7! L-7b, 28?-28b и и и и Level detector, 81L-8b, 29! L-29b и и и и и и и и и и и
Input distortion V bell determination circuit, ea ~ 90.3Q & ~ 300 и и и и и и Level regulator control
circuit, 10. 31 и и и и и 7 calculator, 11 ░ 35 иииии Signal generator, 12.36 и и и и и и Signal generator
control circuit, 13.34 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и speaker non-single gland distortion determination circuit 14.33 ... и и и и и и и и и и и и и
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
37 и и и distortion detection circuit .39 ииииииииииииииииииииииииииииииииииииииииииииииииииииии иииииииииииииии
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии 19 Output terminal, 20 ???????
????????? ?????????????
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