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JPH03203498

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DESCRIPTION JPH03203498
[0001]
[Industrial 1 application field] The present invention measures distortion of the speaker drive
current at the time of producing the speaker system, and adds an inverse i 'and a convolution
function according to the measurement result to reduce the speaker drive current distortion. ?
°↑?! It relates to a speaker / stem in which y ++ T raw is made to be q q. [Conventional Art]
Audio technology in recent years is a compact disc player (hereinafter referred to as CI), a digital
audio tape recorder (hereinafter referred to as I) AT, or a dedicated digital signal? ) More faithful
to the length of the source of the voice medium and the progress of the amplifier interposed
between the source and the speaker to amplify the signal output of the source? ’+−9! F
reproduction has become possible. A speaker system for producing such digital signals; 'r' II rsf
needs to complement IE of the drive current at the production point so that it can produce a
signal with less distortion of the speaker drive current. However, as a means for correcting the
drive of the speaker drive system driven by the output of the amplification by dealing with the
No.4 and No.4 provided in the same speaker, for example, it has been conventionally known that,
for example, , And t + + 'l industrial newspaper company 1 (1) “Speaker and Speaker System”,
pages 87 to 99, known as mo / honal feedback (hereinafter abbreviated as “MFB”). As the
conventional MFB is reduced to the block diagram of FIG. The input terminal r (21) to which the
voice 45 (a) is input, and z'Y voice i 1-i '(a) from the input terminal (2I) are for power! (11) Power
Ill'i (22), the speaker (23) that drives j1 by the output of the power amplification zc22), and the
speed detection ZH24 attached to the speaker (23), the power amplification Ks When the
speaker (23) is driven by the i voice 41i output amplified in (22), the speed detector (24) detects
the vibration speed of the vibrating portion of the speaker (23), and the detected signal (b ) Is fed
back to the power amplifier (22) to control the vibration velocity or acceleration of the speaker
(23). [Problems to be Solved by the Invention] However, in the conventional configuration as
described in 1 ', since the power N + 1 K 4 (22) and the speaker 7 stem are integral with each
08-05-2019
1
other, the speaker in production process (11) Do not select El l 'r (22) for power that is optimal
for system l, (11), 4 (24) detection signals for speed detection to perform vibration control of the
speaker (23) Since the power amplifier (22) is configured to return 1), there is a disadvantage
that the jnl return signal "-) often causes the phenomenon that the MFB is generated depending
on the 1'f and [i-1] of the phase. was there.
In addition, since the power amplifier (22) is configured to drive the speaker (23) by the current
J, there is a problem that the effect of correcting the distortion of the speaker drive 'Iu current is
scarcely low. The present invention has been made in view of the problems such as I 'and 1'), and
it has been measured in advance to amplify the power of ei and η such as 1 ') with a power
amplifier. Inverse NNI of the data: The purpose is to provide the Sbika system t, which makes it
possible to add (-to the Nobumi. The speaker system according to the present invention sets the
speaker driven by No. 4 powered by the external tank 'Nil 24 to 1 ° in order to couple the
purpose described in [p stage for solving the problem]. Digital interface output in speaker 7 stem
body 4. 7 “differential interface inputs that receive“ r S :: ”and“ t ”l: reverse operation for
the speaker drive current sent from this input: real h1! ! Driving current complement stage 11
and the driving current complement 11. . A digital interface output means is provided for passing
the digital output of the external input Ia 14 to the digital interface input of the external input Ia
14. [Operation] The present invention relates to Digital signal output from Hashimoto equipped
with digital interface output of CI, I, AT, BS tuner snow, is received directly to the digital interface
input means, and driving current complement i1-: T, speaker at stage After performing reverse
turn-on operation for the drive current, the digital interface No. 411 processed by the 1) / A
conversion book built in the external amplifier by passing a signal from the digital interface
output means to the digital interface input of the external amplifier When analog conversion is
performed, power is amplified, and then the speaker I receives the signal I to the speaker of the
main body of the speaker system to drive it to the light. As described above, in the present
invention, the speaker drive current is not returned to +) as in the MFB of the prior art, but the
sleeves IL should be used in the drive current tk and Ni iE means as in l ′ and + 尼. R, 4t of
data,? Since it is based on the feed thumbnail method added to SJ, there is no need to select 4 for
the external amplification, and there is no possibility of causing light rotation. [For example] 夫
ド の ・ ・ ・ 実 実 h1! One example will be described in the rules based on the drawings. FIG. 1
is a block diagram showing the internal configuration of the speaker system according to this
embodiment, and FIG. 2 is a block diagram showing an example of the connection configuration
between the speaker system of this embodiment and an external switch.
In FIG. 2, (0 is a speaker 7 stem, (2) is a CD or I digital digit such as an AT or BS tuner;-13 is a
source of digital sound such as '〒'), and (3) is an amplifier. is there. B) The digital signal output
from the digital interface output section (2a) of the source (2) is led to the digital interface input
end J '(la) of the speaker system (+) through the wire No. 4 (4) Digital interface output terminal
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2
(Ib) et al. Signal line (5) after being expanded by No. 1 and No. 1 by means of SVY can stem (1)
Digital interface input terminal 'f' (3a) of amplifier (3) Applied to the Speaker system l, the digital
signal output from (1) is increased! I) / A conversion and in 11Z4 (3) ) Quality 2 '? After being in
controlled, the power is amplified, and from the output end r (3b) through the signal line (6), it is
again used for the input end γ (Ic) of the speaker system (1), the speaker (7) (first R 'from the
figure))? It is made to drive. The speaker system 0) connected to the signal source (2) which is a
source that sources the digital interface output as in 1- 1 is as shown in 1) 1) 1 i other speaker
(7) A first interface unit (8) as digital interface input means, a signal processing unit (hereinafter
referred to as 1) SP as a drive current correction means <9), a rewrite i + J memory element
(hereinafter referred to as EPROM) (10) and a second interface unit (11) as one stage of digital
interface output. 1) 'I + The input terminal (Ic) of the speaker system (1) is connected to the input
terminal (Ic) via the speaker (7) and the signal line (12), and the power is supplied by the
multiplier (3) By applying the amplified j't, j7H4rj to the input & Afr (Ic), the speaker 7 is driven
i). The digital (+ '?) Applied to the digital interface input terminal r (la) from (i) + -J jlld (2). “J is
converted to 4+ <” J processing format in the first interface unit (8) led via the Shinbow line (i3),
and I) SP (9) via the Shinbow-line (14) Led. I) SP (9) consists of a drive U flow sleeve 1 F section
configured to calculate data at the point of production stored in EPROM (Io).
This I) S P, that is, the contents of the processing of the drive current correction section (9) is to
carry out an inverse 4 ° L inclusion calculation of the speaker current shown by the following
expression. Y t) = h (t)-'XX (t) where h (t)-: inverse im 辻 function of the loudspeaker X (t): human
警 Y Y (t): driving current correction means force 1) SP (9: Processed B, 1) is converted to a
format by the second interface unit <It), and then output to the outside from the digital interface
output end 'f- (1b), 1; f noted, l) 'I, i self, is sent out to + (3) for amplification through the 113 line
(5). [Effects of the Invention] As described above, the speaker system of the present invention
reverses the distortion of the drive current at the time of the speech stem biomedical office by
the drive current complement I provided in the speaker system main body in exactly zero stages.
Because it is made to calculate, it is less flattery] 4 life blame is obtained. Further, since the drive
current correction means is based on a feed forward method in which data to be corrected is
added to the signal ij in advance, there is no need to select an external amplification book as in
the conventional MFB, and oscillation is generated. As a speaker system for equipment that uses
digital 4r <SJ as a sound medium, there is no such thing as an unprecedented effect.
[0002]
Brief description of the drawings
[0003]
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FIG. 1 is a block diagram showing an internal configuration of a speaker system according to an
embodiment of the present invention, FIG. 2 is a block diagram showing a connection
configuration with an external device in the present invention, and FIG. It is a block diagram
which reduces the example of the structure of MFB as the conventional lower part which
complements movement by signal processing.
(1) ... Subikashisute l, body, (2) ... b S signal source, (2a) digital interface output of ... signal
source, (3) ... external increase 輔器, (3a ) · · · Digital interface input terminal r1 (7) · · · of the
external amplification book · Speaker, <8) · · · Digital interface input means, (9) · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Digital interface output means.
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