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3 Patent Applicant 41 Agent Cloud 160 Address 1st Section, 8-1 Shinjuku Nishi-shinjuku, Tokyo
(New Building) Place Tokyo (03) 343-5821 (Representative) 52-7701 / 212 Tsuno specification
name of the invention sound and characteristic correction device signal source of the adjustment
signal, a plurality of band pass filters for dividing the input signal into a plurality of frequency
bands, the level of the band divided signal, A data signal having data of a plurality of variable
gain amplifiers to be changed, an adding circuit for adding the signals subjected to the abovementioned band division and the above level change to each other, comparison 1 scheme and
desired 1-frequency and characteristics is generated It has all the frequency characteristic setting
circuit, and at the time of adjustment, VC adjusts the above adjustment signal by supplying the
speaker VC provided in the reproduction sound field and reproduces it, collects this reproduction
sound from the microphone vc, and this sound is collected On signal k The band is divided by a
plurality of band pass filters, and the ground is narrowed in all the above-mentioned relative
yield and the data signal from the level of the divided signal and the above-mentioned frequency
characteristic setting circuit, and the plurality of variable gains In the case of 1 above, the audio
signal sound, the plurality of band pass filters, the plurality of variable gain amplifiers with the
gain calibrated, and the addition circuit are supplied to the speaker for the reproduction sound i.
Acoustic characteristics complement Ft that was made to reproduce.
Detailed Description of the Invention When performing audio reproduction, the sound quality of
the reproduced sound is determined by individual factors, but among them, the influence of the
frequency property is the largest, and when the wave number characteristics change, the
reproduced sound is Sound quality is greatly assimilated. [7] With regard to the amplifier, it is
relatively easy to make the frequency and characteristics have desired characteristics, such as
flat characteristics, but it is relatively easy to make the frequency characteristics of the listening
room, which is a speaker or playback sound field, flat. In particular, the listening room can not be
interrogated, so it must be corrected in some way. Therefore, in the prior art, a correction device
called graphic equalizer is used, that is, it is divided into frequency bands of audio
reconnaissance number, and desired frequency characteristics can be obtained by increasing and
decreasing the level for each band. There is. However, since it is not known how to adjust the KA
to be the desired frequency% by the adjustment of EndPage: 1 by the graphic equalizer, the
reproduced sound may not necessarily have the desired frequency characteristics as a result.
SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention
to provide a sound-to-speech number correction correction that can make the frequency
characteristics of reproduced sound have desired characteristics. For this reason, in the present
invention, the adjustment signal is reproduced from the speaker, and the frequency component
of this screaming sound is compared with the data @ having data of desired same wave number
characteristics, and the comparison signal The wave a characteristic is changed so that the
reproduced sound of the desired frequency characteristic can be heard. An example will be
described below. 11) is a tuner, a record player, a source of an audio signal such as a tape tape, a
+211 rl preamplifier 1. + 31 id main amplifier, · 4) indicates a speaker, and these 湊 山 ~, 4) are
those that are currently used for audio reproduction. Here, (5M) and (5N) are switches that can
be switched between adjustment and use, and in FIG. 1, (7A) to (7J) indicate band pass filters for
dividing the frequency band of the audio signal, These are, for example, the pass characteristics
(7a) to (7j) as shown in FIG. 2, that is, in the audio band, the same wave number is centered on 1
kHz and is 1/2 or 1 Each of them is taken as a pass center frequency, and is adjacent to the
adjacent characteristic curve at a point of 13 dB, and has a relatively steep pass characteristic.
In addition, (1B is an iA pattering signal for adjusting the frequency characteristics, for example,
a pink noise signal is generated completely! The i source, +121, waters the microphone, and this
microphone 12+ is placed in the leaning position of the sitting room at the time of IS alignment.
Furthermore, (181 is the data signal 竜 l l + + す る + :, does the chest 時 時 time setting) shows
the envelope, this setting circuit (1 鵠 鵠 鵠 鵠 再生 再生 再生 L L L L) The data of the data signal
changes corresponding to the setting i. In this example, this data @ is a digital signal. In the case
of private use, the switch (5M on (5N) is connected to the contact U in reverse to the figure.
Therefore, the audio signal from the source (1) is preamp (2), switch (5M), -7 <sofa amplifier (6)?
The filters (7A) to (7J) K are supplied, and the 2M pass characteristics (7a) to (73) VC are divided
into regions, and the band-divided audio signal is variable gain amplifier (8A) to (8J) is treasured
and η 轢 轢 洛 9) K supply, which is added to n to be the original audio signal, and this audio
signal is the switch (5N), the main amplifier 13 )) And supplied to the speaker '4) to perform
audio reproduction. And if the frequency setting end of the playback sound is set to all desired
characteristics, @vc sets the setting circuit to the '笥 vL number characteristic of the desired
playback sound and the switch (5AM in (5N) as shown in the figure. Contact point T. Then, for
adjustment @ + Ejm (a pink noise signal for 1 adjustment from the ID, switch (5N) and amplifier +
31 are output 1 and supplied to the speaker (4), and the pink noise sound is reproduced again
from the speaker (4)・ It will be However, it is usual that the pink noise sound reproduced from
the speaker (4) does not have the frequency characteristic as pink noise due to the fitting, the
frequency characteristic of the speaker (4) and the tO ## characteristic of the listening room. And the pink noise sound reproduced from this speaker 14) is set at the listening position [It is
picked up by the microphone (121 collected, and this picked up pink noise signal is microphone
amplifier + t: fJ, switch (5 M , Amplifier +6) through the filters (7A) to (7J) to be band-divided and
band-divided, and this band-divided pink noise signal differs from the amplifiers (8A) to (8J) to
form a rectifier circuit (14A ) To (14J) to be a DC signal of a level corresponding to the level of
each band for each band, and this DC signal is supplied to variable gain amplifiers (15 to 15J)
and a rectifier circuit A DC signal is extracted from (14F) that overflows the band division signal
(corresponding to the characteristic (7f) of the second south) having a pass center frequency of 1
kHz. 5A) ~ (supplied as' 411 # signal of the gain 15 J).
Thus, the DC signals from the rectifier circuits (14 &) to (14J) are processed in the amplifiers
(15A) to (15J) from the rectifier circuit <14F) as EndPage: 2 level reference of all DC signals.
Then, this standardized DC signal is supplied to the A-Di 囚 circuit (16A) to-(16J) to be a digital
signal, and this digital signal is supplied to the digital signal @ (17A) to (17J) K. At the same time,
setting circuits (data signals indicating desired frequency characteristics from one barrel are
compared (17 to 17 J)). The digital signals from the comparison circuits (1′1) to (17J) VC,
O.sub.i, and AD ′ and conversion rllft (16A) to (16J) are the data signals from the setting circuit
(181 and The comparison is made and the comparison signal is taken out. Then, this comparison
signal is supplied to the signal sources (19A) to (19J) of the gain control signal to extract the gain
control signal, and this gain (illgl signal is supplied to the variable gain amplifiers (8N) to (8J)そ
利得 壱 1 year old 奸 ζ. Here, the signals y4 (19A) to (19J) function so as to eliminate the
comparison signals of the analog circuits (17A) to (17J), that is, gain from the signal sources
(19A) to (19J). As the control signal changes, the gains of the amplifiers (8N) to (8J) change
accordingly, and the digital signals from the conversion circuits (16A) to (16J) change. When the
data signal from Oa matches and the comparison signal from the comparison circuits (17A) to
(17J) disappears, the level of the gain control signal at that time is maintained until the reset
switch (22) is operated. It has been Therefore, if the switches (5M) and (5N) 't1m are connected
to the condensation point U in this method, then the gains of the amplifiers (8N) to (8J) are
divided by this. Pink noise signal (digital signal) and the setting circuit (the data signal from 1 一
致 is in agreement, so the number of reproduced sound from the speaker 14), if it is
characteristic, corresponds to that data signal E7 It has a characteristic, that is, a desired
frequency characteristic. Also, sleeping with this, the gain control signal of the signal source
(19A) to (19J) is h! Since the correction term of the il wave number characteristic is shown, this
gain control signal is supplied to the table (right side 211) and the correction amount is
displayed, for example, as a graph. Thus, according to the present invention, the frequency
characteristic of the reproduced sound can be made to be a desired characteristic, and this can
be performed automatically.
Moreover, since the first adjustment is simultaneously performed on the audio i area frame, it
can be adjusted in a very short time. Also, by setting the audio signal abbreviation from 1) of
amplifier 6) to + ma circuit 9) = 1'kOdB, an adapter 11c is connected between amplifier 11) and
main amplifier 3; You can also. Furthermore, it is effective as howling anti-blue 4 blue in this 俟 1
HA system etc. That is, since howling generally occurs at a maximum of 41 / sbons of frequency
characteristics and occurs at '1ffa in frequency characteristics, one for the PA system as the
microphone (121, amplifier C13) 16.3) and the speaker 4) is added At the same time, the setting
circuit (181 I's data signal @ may be made to correspond to flat frequency characteristics. In the
example of the A1 layer, Toriura, wholesale of the amplifiers (8N) to (8J) is a closed loop, but in
the example of FIG. The comparison signals from comparison times @ (17A) to (17J) are
supplied, and the hold circuits (23A) to (23J) 1 & 11! l Just amplifier (8A) ~ (8J) K 7 of its gain!
Provided as Iffs' 14 (T'S No.), the gain of the amplifiers (8A) to (8J) corresponds to the leveling of
the comparison signal! As it is being sailed, it is held by the hold circuits (23A)-(23J). In addition,
it is for switches (2-shelve hold to (19 J)). Therefore, if an arrow is placed on the contact U in the
direction of the switch (5M) or (5N) f, then the comparison signal of the comparison circuits
(17A) to (17J) '(this is halt 1φ) Since the gains of amplifiers (8A) to (8J) are changed according
to the level of the comparison signal from VC which is connected by paths (23A) to (23J),
speaker (4) power island The frequency characteristics of the reproduced sound from these
components are characteristics corresponding to the data signal from the setting circuit 081, that
is, the desired single phrase wave number characteristics. FIG. 4 shows an example of the filters
(7A) to (7J) and the amplifiers (8A) to (8J), where eight indicates the calculation 糟 糟 and ヲ, coil
L & capacitor Ci C, and through, EndPage: 3 The over center frequency can be determined, and
switches 81 to 8 W times! By switching at the outputs of (19A) to (19J) and (23A) to (23J), a gain
corresponding to the value of the resistor R1′′Rn is obtained. In the description of L, an
adjustment signal, a white noise signal, an impulse signal, a sweep signal or the like may be used,
and in the case of these signals [i, for example, the data signal from the setting circuit (181 may
be weighted according to the signal.
If these -J adjustment signals are obtained by, for example, reproducing from a record, it is
possible to set the frequency response including the cartridge. Brief description of 154 pages,
IE11 Fig. 3 shows a system diagram of an example of the present invention, Fig. 2 shows a
characteristic diagram for explanation thereof, and Fig. 4 shows connection of -f11 of a part
thereof. is there. illμ sources, (7A) to (7J) band pass filters, (14A) to (14J) banded flow circuits,
(17A) to (17J) comparison circuits, (塙 for r! Six wave number characteristic setting circuits,
(19A) to (19B3) are gain control signal sources. EndPage: 4
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