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The present invention relates to the sound quality adjustment circuit FIII with the desired GD half
wave number characteristic rcllIMT of the 1iii1 wave number characteristic of the speaker. As a
circuit that performs step 1, a loudness circuit that corrects the sound pressure level to
approximate to the flexure-Manson characteristic, or the motion of the vibration system of the
speaker is detected, and this detector @ is fed back to Improve (ie, lower the speaker's lower tR8
wave number (fo) and QOII variable) moral feedback (MFB) circuit, or divide the frequency band
into multiples to enhance or attenuate the level of the frequency at each division point A graphic
collaborator made to be known is known. However, in the case of the loudness cycle @ IK, which
has been refused, it is premised that the frequency characteristic of the speaker is flat, so there is
a problem that the naturalness of the low range is lost if excessive low range correction is
performed. The MFB circuit requires a separate detector for detecting the vibration system of the
speaker. In addition, the low frequency characteristic of the speaker could not be corrected
sufficiently with graphic feedback. Therefore, the object of the present invention is to provide a
sound quality adjusting circuit which solves the above problems. Hereinafter, the present
invention will be described by examining the drawings. Now, assuming that the transfer function
of the speaker is Gs and the transfer function of the amplifier for driving the speaker is Gm, the
entire transfer function GijG-G! Of the speaker and the amplifier 111! I−Gムとなる。 Since the
transfer function Gm of the normal amplification a is 1, the entire transfer function G is Gs, and
the entire characteristics are determined by the characteristics of the speaker. The speaker's
characteristics (especially low-frequency characteristics) are determined by the low-frequency
resonant frequency (fo) and QoilK of the speaker, so the speaker's transfer function (ie, the
characteristics of Subi *) G6 is Gg (fo, Qo) It can be expressed as Here, assuming that the lower
resonance frequency of the desired frequency characteristic is (to ') and the Q value is QO #, the
entire transfer function G becomes Gs' (fo '% QO') d, the desired frequency from the speaker It is
possible to obtain the characteristics, that is, if the entire transfer function G is justified, that is,
the front stage of the speaker can be configured T, and the low frequency characteristic of the
speaker can be expressed as being approximated by a single resonance system. . However, it is xfo. Here, since the third term of the low frequency resonant frequency (fO) of the speaker and the
equation becomes zero, G 'is The second term is the desired frequency characteristic to (f'o '). The
transfer function of a 12 (Bs10 ct low pass filter with the same low pass resonant frequency and
QWi as (QO ') is shown.
The transfer function shown in equation 19T, equation (2) ', is a block diagram of FIG. ! ! In FIG.
1, (1) is a low pass filter (L P F), and (2) is an addition-which adds the low pass filter (1) & 0
output and the original force signal. FIG. 2 is a diagram showing a specific circuit example of FIG.
1. A low pass filter (11) is constituted by resistors (R1) (R2) (R1), condensers f (Ct) (C, operational
amplifier (oP1) , Resistance (R4) (R1) (R4) (R7) and the operation increase 11g1 (oP21 Kl. The
calculator (2) is configured. The transfer function G # of the new circuit may be determined as a
constant of 2K OI 02 RRR 5 m Ry. The above detailed description of the present invention,
according to the present invention, lower resonance frequency of the desired frequency
characteristics A low pass filter for calculating (f o ′) and Q ′ values, an adder for adding the
output signal of the low pass filter and the original force signal, and a speaker for which the low
frequency IkR pigeon wave number (fO) and Qli have desired frequencies By applying the output
signal of the adder to the sliding force) speaker tDlii! Since the wave number characteristic is set
to the desired frequency characteristic T, the naturalness of the low range is not lost at the time
of the low range &) positive & J as in the conventional configuration with a simple configuration,
and the speaker V Also need a detection means to detect the movement of the drug system.
Brief description of the drawings
S1 figure shows the main town circuit j2 at a chart figure, Ws2 figure is sled specific time w! It is
a figure which shows a to- example. (1) ... low pass filter, (2 J ·-adder. To the ground 佐 * # 大 -7
・ 5 pa S, this ')'
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