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The present invention relates to an apparatus for improving frequency characteristics of acoustic
output. Conventionally, the frequency of the sound output generates a noise signal with a
plurality of frequency signal generators or a constant band before hearing or recording the
generated sound. The sound frequency characteristics were improved by using a device having a
built-in device, etc. L, and while listening to music or while recording music, it was only kept in a
pre-set 2'r4 adjusted state. Therefore, it is always possible to respond to changes in transmission,
such as the spread of nine sounds along with changes in the external environment caused by the
change in the external environment caused by changes in the environment from time to time,
such as temperature, humidity, and climate. There is a corner j iJ that can not obtain the sound
effect in the state of. Furthermore, in the case of the prior art, when setting the best state of the
sound output in advance, it is necessary to operate the frequency signal generator separately
provided each time to adjust the equalization circuit to transmit the sound output signal to the
speaker. There is an insult that takes time and effort. The present invention has been considered
in view of the problem of overhead, and the purpose of the present invention is to save the
trouble of adjusting and setting the sound output in advance by operating the frequency θ
generator or the like as before. And provide the frequency characteristic improvement device of
the echo output that can always automatically and automatically respond to the audio output
changing depending on the environment from moment to moment. It is in. Such a feature of the
device according to the present invention is to receive an echo signal from an auto circuit, an
adjustable variable circuit to transmit +9 circuit- \ echo output signal, and the amplification
circuit to the amplifier circuit. A detector for detecting an acoustic output from a connected
speaker; a village for adjusting a time lag of an acoustic output output from the female circuit
and an acoustic output signal input from the detector; Level difference detector which compares
the sound output state of the circuit with that of the detector (1) through the UM node, and the
ring difference signal of the sound output from the level difference detector. And a controller that
adjusts and corrects the sound output from the M14 equalization circuit. Hereinafter, an
embodiment of the device of the present invention will be described with reference to the
drawings. In FIG. 1, reference numeral 1 denotes an audio circuit, and the audio circuit 1 is + y Fr
to the speaker 4 through an equalization circuit (equalizer EQ) 2 and an amplification circuit 3. It
is also connected to the equalization circuit 21d1 and the controller 5, receives the signal from
the controller 5, and is automatically corrected to the frequency band of the best acoustic output
of the f equalizer band (EQBAND) as shown in FIG. Come to
The output シ 1 of the purification circuit 2 is connected to one side terminal of the level
difference detector 9 of the acoustic output through the band pass filter BPF 6, the integrating
circuit /, and the sample and hold 8. The other terminal of the level difference detector 9 is a Z
which detects an acoustic output disposed opposite to the speaker 4, which is a sprayer, a
microphone 10 to an amplifier 11, a band pass filter 12 are connected to a wire connected via
the integration circuit 13; That is, the frequency component of the acoustic output output from
the equalization circuit 2 is separated by the band pass filter 6 and converted to a DC level by the
integration circuit 7, and the frequency component i ′ ′ converted to the DC level is timed
from the microphone 10 side. The frequency t that is input with Tanggu! The difference between
li and the level difference detector 9 is compared under the same condition 6 where the
frequency components input from the microphone 10 side (l is amplified by the amplifier 11 and
the bandpass filter is 12, separated and integrated circuit 16 to convert DC level [i, i! '! : The
sound strength is equal to the circuit 2 (! Level difference detector from 11? It is set to be the
same condition as the frequency component input to the. The sound output signal from the
equalization circuit 2 has a time lag, which is a trade-off to adjust the time lag of the 5 outputs of
the tondle 5 to be input from the equalization circuit 2 and the microphone 10. Function to hold
the frequency component until the sound output signal from the microphone 10 is input to the
level difference detector 9, and the controller 5 performs the I-J example of the holding time It
has become. In this controller 5, the tone burst signal r is used in advance by the calibration
operation at the time of microphone setting, and the sound j output from the speaker 4 is used?
The time lag until the output is input to the microphone 10 is input. The device of the present
invention having the above configuration operates as follows. First, the frequency component of
the sound output inputted from the audio circuit 1 to the equalization circuit 2 is separated by
the band pass filter 6.12, and the separation and conversion to the DC level are as shown in FIG.
Each band is performed by time division tL, and the necessary 7 is searched for all bands from
the upper limit to the lower limit of the frequency-(-). Then, the level difference detector 9 detects
the DC level difference on both the equalization circuit 2 side and the microphone 10 side, and
sends the information to the controller 5. Next, the controller 5 analyzes this information, and
correction of the frequency characteristic of the equalization circuit 2 is automatically performed.
Even if the sound output changes due to a change in the external environment, etc., the
correction is automatically made accordingly. Since the correction of the equalization circuit 2 is
performed, music can be listened to or recorded in the best sound output state.
The correction of the frequency characteristic of the equalizing circuit 2 is performed by setting
the time difference between the equalizing circuit 2 which is the acoustic output 1111 and the
input-output microphone, i.e. Since the level difference is measured at level difference detection
y, <39 K, it is possible to make an accurate correction of the frequency characteristic. As is clear
from the above-mentioned configuration, according to the "Behavior" device, sound output is
made in advance by operating the conventional frequency generation and retroactivity! 112 112
7j 手 定 定; 省 使 11 と と も に と と も に 11 と と も に と と も に 正確 正確 正確 正確 正確
正確 正確 正確 正確 正確 正確 正確 正確 正確 と と も に と と も に と と も に と と も に と と
と と も に と と も に 1 The state will have many effects such as イ, being held, etc.
Brief description of the drawings
FIG. 2 is a block diagram showing an embodiment of the device of the present invention, and FIG.
2 is a view showing an example of a frequency band searched by the equalization circuit shown
in the first diagram.
DESCRIPTION OF SYMBOLS 1 ... Audio circuit 2 ... Equalization circuit 3 ... Amplification circuit 4
... Speaker (detector) 5 ... Controller 8 ... Sample and hold (adjuster) 10 ... Microphone (Detector)
Patent Assignee Japan Marantz Co., Ltd.
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