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JPS6041395

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DESCRIPTION JPS6041395
[0001]
The present invention relates to a speaker system, and more particularly, to a speaker system
that is supplied with power with low distortion, high output performance, wide bandwidth and
wide bandwidth. Speakers installed in free air conditions and in an infinite baffle arrangement,
such as those used in automobiles, usually have the disadvantages of intermodulation distortion,
low sound pressure output and low efficiency. If the speaker driver is optimized for a particular
output level (for example, 100 (it) with low distortion input power) then the raised sound
pressure level (for example It is known that when the input signal corresponding to the lowest
dynamic headroom (which is about to be played back with high fidelity) corresponds to driving
the speaker, the distortion becomes large. In the extreme case, the speaker's voice coil may pop
out of its gap due to instability of the speaker's cone movement 0 which results in up to 20-30%
intermodulation distortion . In the past, this problem has been avoided by using stiffer support
spiders and converter edges to control the movement of the speaker's diaphragm. However, this
will cause a sharp drop in the efficiency of the loudspeaker and an increase in the drop in
efficiency at low power levels. It is almost impossible to optimize the loudspeaker's sensitivity
(which is a function of the support and the magnetic flux) because of the intermediate output
power amplifier which is configured to drive the loudspeaker to produce a sensible sound
pressure level. It is possible. In this case, the sound pressure level is not linear with respect to the
power increase (i.e., 3 ab increases as the power input is doubled). The specifications and data
quoted by manufacturers for a standard loudspeaker are good for some loudspeakers but not
good enough to determine if they are bad. At building power and at various frequency levels, the
loudspeakers do not operate at a constant efficiency, and their specifications usually squeeze that
the loudspeakers operate with constantly changing efficiencies thereof. Even speakers with the
same frequency response may have different efficiency characteristics. Furthermore, multispeaker devices that are provided with multiple signal inputs are prone to intermodulation
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distortion and are prone to non-linearity problems. Conventional speaker systems generally do
not solve the problem of efficiency non-linearity at different power levels. This problem is easily
detected when the loudspeaker is operated at different sound pressure levels, indicating that the
information reproduced by the loudspeaker is not constant about the content of the frequencies
involved.
At low power levels, the fact that the human ear is less sensitive at lower levels, eg 5 Qdb, than at
higher levels, eg 100 (11), for sounds of very low (and high) frequency Require a large low
persuasive level rise. At high sound pressure levels, the ear / brain thread perceives all
frequencies with approximately equal loudness. When considering the loudspeaker as a sound
emitter (the purpose of which is to convey the entire acoustic spectrum to the listener with
correct frequency balance), it becomes clear that the linear driver (amplifier) does not achieve its
performance. In other words, the driver must be modified and configured to compensate for the
degradation of the speaker's performance and the changing frequency sensitivity of the ear as a
function of size. The modification of the same wave number response to compensate for the nonlinear dynamic limits of the loudspeakers is by using a conventional equalizer to raise the
frequency level by the same amount regardless of the sound output level setting. Usually done.
Thus, with 6odb requiring one Qdb level improvement, the equalizer also improves the 100db
level. Also, the amplifier can output the power level corresponding to 1ioab, but since the
speaker exceeds the linear limit of it, the speaker can only output the sound pressure level of Wscani 1o 3 db, and the half of the sound output is distorted . Finally, when jumping out from the
voice carp A / car gap, an avalanche phenomenon occurs in which the magnetic flux of the coil
increases in the fi midstream. As the current increases, the force to drive the coil out of the gap
increases, which results in the generation of a very loudly distorted lowest sound from the nonspeaker. The basic approach of the present invention is that by configuring the amplifier and the
speaker as an integral unit, optimum performance of the speaker / stem is achieved. The
amplifier changes the frequency response of the drive signal applied to the speaker so as to
compensate for the output limit of the speaker and the sensitivity of the human ear to change
due to the same wave number, but the pre-emphasis added to the input signal A device for
dynamically changing the amount of By combining with the electronic amplification circuit and
the speaker integrally, the characteristics are altered, and it is possible to increase the sound
pressure, expand the frequency response curve, and reduce the distortion. The degree of preemphasis, and hence the frequency response of the signal to the noise 1-force, is dynamically
varied as a function of the level of the input signal and can be configured taking into account the
loudspeaker amplifier system.
It is an object of the present invention to provide an input signal for f [t controlling the
movement of the speaker diaphragm by ff1 l J XI under optimal conditions and at various sound
pressure levels. To obtain a dynamic electronic circuit controlled by Another purpose of false-
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bright is to obtain an acoustic radiator that increases the maximum acoustic power, extends the
frequency response curve, and eliminates most distortion by predetermining the maximum
movement of the speaker's diaphragm. . Yet another object of the present invention is to provide
an improved acoustic radiator unit that is simple in construction and inexpensive. The invention
aims at a method of controlling the performance of a loudspeaker in a self-powered loudspeaker
system, in which the audio signal is dynamically modified by means of an electronic control
circuit before it is applied to the loudspeaker coil drive power amplifier. It is Hereinafter,
referring to the drawings, with reference to FIG. 1 which will be described in detail according to
the present invention, an electronic drive unit 10 composed of a power amplifier and a speaker
control circuit of the present invention is shown in FIG. It is attached to the back. (If desired, the
control circuit can be physically separated from the power amplifier and the speaker. The drive
includes a radiator 14. Because the radiator is disposed between the cone diaphragm 16 and the
drive, the advantage is obtained that the air drum generated by the movement of the diaphragm
helps to cool the drive. A connection 18 is provided between the drive and the two loudspeakers
for the high frequency range and the low frequency range. Referring now to FIG. Driver 10
includes a preamplifier 20. The preamplifier receives an input signal and provides a constant
speed control "circuit or cva21-. This aVC includes the splitter 22. The splitter divides the input
signal into a high frequency range and a low frequency range. The high frequency signal from
the splitter is applied to the first DC converter / time constant network 24 and the low Ii! The tI
wave signal is provided to the second DC converter / time constant network 26. These two
networks generate a DC output signal which is a function of the magnitude of the input signal.
The DC output signals of these DC converter / time constant networks 24 and 26 are used to
control the high frequency active turtle pressure regulator shaping circuit 28 and the low local
oscillator active voltage I11 template circuit 30, respectively. The outputs of those active
compression and shaping circuits 28 and 30 are applied to a constant speed locker 32.
This equalizer receives the recombined audio input signal from divider 22 and changes its
frequency response as a function of the output of active voltage control shaping circuit 28.30.
The output of the equalizer drives a power amplifier 36, which drives the speaker 12. The power
supply 37 supplies the power supply voltage to the preamplifier 20, the cva 21 and the power
amplifier 36. Therefore, the equal signal 320 frequency response is a high frequency active 'filter
control @ shaping circuit 28 and a low frequency active voltage control m It is controlled by the
output of the circuit 30. The active voltage control 11 shaping circuits are controlled by a DC
voltage proportional to the magnitude of the audio input signal. At low level input signals, the
active voltage control shaping circuit fires the maximum effect, causing the equalizer to raise the
level of the lowest frequency and the highest frequency. As the level of the input signal goes high
(the rise in level decreases and eventually the low frequency cutoff is moved upward). Since the
speaker cone moves the most at low frequencies, moving the cutoff frequency upward can
increase the total power level of the speaker without exceeding the cone's maximum travel limit.
Thus, the device dynamically equalizes the loudspeaker as a function of the magnitude of the
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input signal. The constant-velocity equalizer prevents the voice coil of the speaker from jumping
out of the optimum flux region by controlling the movement of the speaker's diaphragm
regardless of the mechanical flexibility of the speaker's diaphragm. This significantly improves
the efficiency of the loudspeaker and allows the loudspeaker to reproduce undistorted
waveforms at high sound pressure levels. The% t1111141 circuit 10 and the speaker system 12
are integrated devices, and the measurement of the magnitude of the input signal and the heartchanging power and speed limit the mechanical characteristics of the speaker and structural
limitations And according to the limits of the mechanical properties of the movement of the coil
in the magnetic field. The high frequency operation controlled by the converter 24 and the active
voltage side leg shaping circuit 28 is not to take into account the movement of the speaker cone,
but to maintain a balance in the overall sound reproduction of the speaker system. It is Because
the low frequency response is controlled by the converter 26 and the active voltage control
shaping circuit 30 in conjunction with the equaliser 26, an imbalance may occur between the
high and low frequencies in the recovered signal. Since the low frequency response is controlled,
the rising characteristics of the high frequency spectrum should also be controlled.
The converter 24 and the high frequency active voltage control shaping circuit are placed in such
a way that this arrangement enters a dynamic control of the high frequency range when the high
frequency part of the input signal reaches a level corresponding to a sound pressure level higher
than about 8 db at 4 KH2. 28 works. This prevents high harmonics from masking low
frequencies at high power levels. The purpose of the high @ wave control part of this device is
not to control the movement of the coil of the loudspeaker (as in the high frequency range it is
not important if the movement of the diaphragm is too large), It is to optimize the balance
between the low frequency range. Reference is now made to FIG. 3 where a more detailed circuit
diagram of the present invention is shown. An input signal is provided to pad 38 including
resistors R1 and R21 R3. The signal from this pad is applied to a pre-amplifier 20 which includes
a signal 01 and a resistor 4 r R5. The output of this pre-amplifier is provided to a splitter 22,
which includes a high band network 22a and a low band network 221). The high band network
includes capacitors c1 and R2, a resistor aR9 DEG R10, and a capacitor C3. The low band
network includes a capacitor C3, a resistor R6PR7 # R8 and a capacitor C2. The output terminals
of 32 and xa3 are respectively connected to the mixing resistors R29 and R30. The common
connection of the resistors is connected to the input terminal of the constant speed equalizing
device 04. Work 02. The output terminal C3 is also coupled to the DC converter / time constant
network 24.26. The network 24 includes an isolation resistor R11 and a full wave rectifier. The
full wave rectifier comprises diodes D1 and D2. The negative DC 'voltage from diode D2 is
applied to high frequency active voltage control i11 shaping circuit 280 input through resistor
R13 and an RC network consisting of charge capacitor C4 and discharge resistor R15. The
voltage across the terminals of the capacitor C4 is a DC voltage proportional to the size of the
high frequency portion of the input signal and is used to control the frequency active voltage
control shaping circuit 28. The DC converter 26 includes resistors R12, R14 and R16, and a
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diode D3. The operating speed of this device, which includes D4 and capacitor C5 and operates
in the same manner as capacitor 24, is determined by resistor R15 and capacitor C4 of converter
24, and resistor R16 and capacitor C5 of converter 2G. . The output of the converter 24 is a high
frequency active voltage control shaping circuit 28, in particular a control input to the FKTI of
the high frequency active voltage control shaping circuit 28, which high frequency active voltage
control shaping circuit 28 operates as an active conductor.
This active conductor resonates as a function of the value of the input signal to FET1. The high
frequency active voltage control shaping circuit 28 includes resistors R17 to R20, capacitors c6
and R7, and a transistor TR1. The FET I operates as a voltage controlled resistor O. The
resistance of the voltage controlled resistor varies with the value of the DC output signal of the
converter 24. The high-low active-pressure suppression control circuit 28 applies a DC output
signal to the inverting input terminal of the constant-speed equalizer 32 via the resistor R20. The
transistor TR1 operates as a resonator. The resonant point of the resonator changes as a function
of the drive signal applied to FETI. The low-frequency active voltage system shaping circuit 30
operates in the same manner as the high-frequency active voltage ftj 1 H shaping circuit 28 and
1 j T 2 varies its resistance as a function of the input 16 from the DC converter 26. The low
frequency active voltage control and shaping circuit 30 includes resistors R21 to R24, a
capacitor 08109, and a transistor TR2. The resonance point of the transistor TR2 changes as a
function of the drive signal applied to the FFI: T2. FF1TlとFI! When the input voltage to
i, T2 is low, i.e. when the amplitude of the input signal is low, the resonator is at a maximum to a
constant speed locker 32 (composed of 104 and a feedback resistor R25). Acting @ The reason is
that the resistance of the PET is low and the resonator can act on the feedback resistor R25.
When the input voltage to the active voltage control shaping circuit 28.30 is high (the value
becomes FF1Tl, the resistance value of the FET 2 becomes high, the function of the resonator to
the constant speed equalizer 32 becomes weak. Therefore, the frequency response of the output
signal of the constant velocity equalizer 32 is dynamically changed and depends on the level of
the input signal. Once done, constant velocity equalizer 32 produces an output signal that varies
in frequency response as a function of the magnitude of the input signal. A portion of the input
signal is provided directly to IO 4 and the remaining input signal is used to generate control
signals to change the response of the combination of rc 4 and resistor R 25. The output terminal
of IO 4 is coupled to output pad 40. The output pad includes resistors R26 and R27. The output
signal is provided to the power amplifier. The operation of the active voltage control shaping
circuit is such that, at low volume, the resonator raises the still and low frequency levels in the
output of the room speed equalizer.
In order to limit the maximum movement of the loudspeaker diaphragm, as the input signal
becomes larger, the enhancement of the high standing wave number and low frequency levels in
the output of the constant velocity equalizer is reduced. Referring now to FIG. The present
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invention can use a pair of eves in a dual amplification configuration. In such a configuration, the
input signal is provided to the preamplifier 42, and the output of the preamplifier is provided to
the electronic crossover 44. This electronic crossover separates the signal applied to it into a cold
frequency part and a low frequency part. The signal portions thereof are given the first cya 46
and the second CVC 487, respectively. そ れ ら Their CVCs are the same as cya 21 shown in FIG.
3 (ie, a pair of DC converters and high frequency active voltage regulation). l shaping circuit, low
frequency active voltage control shaping circuit and constant speed equalizer included in each
0Vq 46. 48]. The output of cya 46 is provided to power amplifier 50. The power amplifier drives
the high frequency speaker 52. The output of ava 4 B is provided to power amplifier 54. The
power amplifier drives a low frequency speaker 56. The components that make up the C'JC 46,
48 are selected to match the characteristics of the speaker 52.56, respectively. したがって、C!
The VO46 low frequency active 'torque pressure control shaping circuit operates to not exceed
the maximum movement limit of the speaker 52 cone, and the CvC 48 low frequency @ voltage
control shaping circuit does not exceed the maximum movement limit of the speaker 52 cone To
work. In this way, the multi-speaker system can be controlled to compensate for the
characteristics of valley speakers in the multi-speaker system.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an acoustic emission of an integrated amplifier and speaker, a vertical half sectional
view of the unit, FIG. 2 is a block diagram of the speaker / amplifier apparatus of the present
invention, and FIG. 3 is the speaker shown in FIG. FIG. 4 is a circuit diagram showing an example
of the circuit configuration of the amplifier device, and FIG. 4 is a block diagram showing an
embodiment of the dual amplification configuration of the present invention.
10 · · · electronic drive unit, 20. 42 · · · · · 11 stationary amplifier, 21.46. 48 · · · · constant speed
control circuit (cya), 22 · · · divider · 24.26 · · · · DC converter / time constant network, 28 · · · high
frequency active voltage control shaping circuit, 30 · · · low frequency active voltage control
shaping circuit, 32 · · · constant speed equalizer, 36.54 · · · power amplifier , 44 ... electronic
crossover. Applicant Agent Takamura Kimura Procedure: 10 巴 (Method) 1984 81] 30 1979
Weight holding application F 68921 No. 2, method of controlling the operation of the speaker
according to the invention and the speaker system 3, person with correction 1 Relationship
Special Br (applicant 1 to Mika, Fleetman 4, agent (〒 104) Tokyo Ginza 2TI, Chuo-ku, Tokyo:
111 ffi 2 No. 11 July 1984 (Delivery port July 31, 1984)
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