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1 、 Name of invention
Sound reproduction device
3, Detailed Description of the Invention The present invention relates to an amplifying device,
and an amplifying device (two main signal lines #! The acceleration of the drive sj J member
(speaker cone paper) 2 connected through makes an electrical output signal substantially
proportional to it, and at least one driver with a change-over device representing the function
conversion function of the driver by C 2 The audio reproducing device C2 of the MFB (motional
feedback) type includes a hunting speaker system (the amplification device is feedback-restricted
EndPage: 2 by a signal superior from the output signal of the converter). Such devices improve
the performance of the lower frequency range of the speaker in several ways. In general (two
well known, the amplifier (two feedback signal stabilizes its function, and usually a two-way or
three-way speaker system The amplifier is guaranteed to be controlled to compensate for the
irregularity of the conversion function of the driver. The result is lower high frequency distortion,
lower low frequency operating limits, and better sound pressure stability as a function of
frequency. However, while the output signal of the converter is only used as a feedback control
signal in the lowest frequency range (eg 600-1000 Hz), its EI 13 has a U-no-coating (cone web as
a rigid body at higher frequencies It does not vibrate, that is, all the partial force balls thereof are
completely uniform (not vibrated, and therefore it is easy to miscorrect (dividing) if the feedback
correction device is used above the low frequency range. In a conventional regenerator, the
amplifier not only feeds the woofer (not only the two supply, but also feeds the tweeter or
squawker, so that the above-mentioned erroneous corrections are uno 1- (two also other drivers
(one or more) Pieces] (two pass. Therefore, in order to avoid false positives completely in the
MFB device (two from the low frequency range amplifier to the woo 71-, another full range or
higher frequency range amplifier to other driver (s) (2 It is a common practice to feed. Each
driver and amplifier should be placed in close proximity to each other, so it is usually necessary
to have the device as an integral unit 'that includes not only one or more amplifiers but generally
an amplifier and a speaker. Furthermore, it is difficult to obtain ideal feedback because the
feedback signal obtained from the converter is likely to cause some phase distortion. From the
point of view of practice, this allows the Uno's feedback device to use an amplifier and a speaker
to be made as an integral unit without using a special woofer amplifier (two are attractive if
obtained) And, the object of the present invention is to provide an acoustic reproduction device
which is improved in these respects as well as in the quality of the feedback control.
The reproduction device according to the invention comprises a filter device connected to the
output of the amplifier and designed for the desired total conversion function of the driver (two
thus producing a reference signal, and a filter device for the reference signal and the converter)
The difference between the reference signal and the conversion signal (a comparison device
which produces a difference signal according to two) is used, and the output signal of the
amplification device is redundant. The difference signal is amplified as a feedback control signal.
Equipment (2 supplied. Primarily the filter arrangement is designed to simulate the driver of the
crossover filter arrangement, if any, with which it is associated (that is to say the desired or
correct converter Dk representation of the driver, ie the associated frequency) The sound
pressure to be produced by the driver's membrane 'at any frequency in the range (biphasic and
vibrational equivalent produces an electrical output signal). This sound pressure is detected
indirectly by the converter (two signals are detected, and there is no key 9 difference signal in
which the output signal of the filter and the converter is identical), the amplifier hunts its own
output used as a feedback signal. Although working in the conventional manner, the driver is
now complete (in two correct ways). When the film starts to operate in an incorrect manner, the
conversion signal is no longer identical to the filter signal, and the resulting difference signal is
doubled to control the amplification to overcome the inaccuracies. Thus, with this arrangement,
the woofer's actual or negative conversion function will be that of the desired or ideal conversion
function (the feedback signal will be constant when the two correspond, and also slightly offset
from the desired conversion function) In this case, the feedback signal is shifted so that the
woofer's actual or negative conversion function tends to control amplification in a desired or
ideal conversion function (two similar approaches). I will. Therefore, the present invention (in the
device according to the present invention, something more than the direct feedback stability of
the operation of the woofer is obtained, ie the desired or ideal conversion function of the woofer
(the stability depending on the two is superior, it is Phase distortion is eliminated or minimized.
Usually, the speaker system (= is the lower cycle of the main signal EndPage: Two-thousandths to
supply only three wave number ranges, two additional speakers, speaker systems additional
squawer, tweeter-crossover network supplied by sieving frequency range gold) It appears to be.
At frequencies higher than the crossover frequency of the crossover network, the woofer (the
sound pressure produced by the two is sharply reduced (so the output of the To be switched off
at a frequency higher than the frequency (divided C divided by two, which avoids said expected
miscorrections, the amplifier drives the speakers of the speaker system or unit in an allconventional manner) can do.
Thus it is sufficient to use only one amplification bw for both drivers or all drivers with two
loudspeaker units d according to the invention (ie, the amplification device is an ordinary radio,
digital recorder or television set) (It may be one glossy, but it must be made to receive the
feedback signal (it must be made two, the speaker unit must have a filter device to make the
reference signal). In this way there is no public safety that is integrated with the amplification
and speaker system bar, and the amplifier system drives an ordinary speaker unit, while the
speaker system, of course, does not benefit from motional feedback operation. The device can
thus be perfectly adapted in that it is driven.
4. Brief description of the drawings FIG. 1 is a schematic view of the present invention (a
feedback device according to the present invention, FIG. 2 is a schematic diagram of the circuit
used in the second embodiment, and FIG. Is a schematic view of the device.
················································································································· − ················································ 12
·················································· f Converter; 32 ······ Wax, 鰍; 22 ···
························································································································ Filter; Crossover network β;
EndPage: 6, procedure correction book (0 Showa! f, June 20, 2002 Patent Office Secretary 1,
display of case Patent No. 5obiq, No. 5 of 1972, Patenter No. 3 in relation to the case of the
injunction case Patent applicant address and name, Bang and Olufsen (name) Akti Selsukap 46
agent 5, the date of correction instruction Showa Date detailed statement of clean statement (no
change in the contents) Patent Office Secretary Hall 1, display of the case Showa 2 patent
application No. ρl / '7 No. 3, correction Relationship between the applicant and the case Patent
applicant 4, agent 5, date of correction instruction Showa Z Z · year z month 27 th 6, number of
inventions increased by correction EndPage: 7
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