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JPH05236589

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DESCRIPTION JPH05236589
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
bass enhancement circuit in an audio amplification circuit.
[0002]
2. Description of the Related Art Heretofore, as the technology in this field, as shown in FIG.
[0003]
However, in the circuit of the above configuration, since the enhancement factor of the bass
region is fixed, there is a problem that the bass region noise is maximally enhanced at the time of
minute volume or no signal. Since the prompt signal is distorted at the time of excessive volume,
measures such as setting the rate of increase conservatively are taken, and there is a problem
that the bass range can not be effectively enhanced at the time of small volume.
[0004]
SUMMARY OF THE INVENTION In order to solve the above problems, the present invention
detects the effective value of the input signal and controls the enhancement factor of the low
frequency range in accordance with it, and the auditory sense at the time of small volume It is
intended to effectively perform correction of low frequency range, enhancement, and reduction
of distortion at high volume.
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[0005]
According to the present invention, the enhancement factor of the low tone range is controlled
according to the level of the input signal as described above, and the enhancement effect is
eliminated at the time of silence or low volume, and the low tone volume is sufficient at low and
middle volume At the same time, it works to suppress the enhancement effect so as not to exceed
the dynamic range when the volume is large, and can reduce the sense of distortion more than in
the case of fixing the enhancement rate as shown in FIG.
[0006]
Embodiments of the present invention will be described hereinbelow with reference to the
drawings.
[0007]
FIG. 1 is a schematic block diagram of a bass range intensifying circuit showing a first
embodiment of the present invention, and FIG. 2 is a schematic block diagram of a bass range
intensifying circuit showing a second embodiment of the present invention.
[0008]
1 and 2, 1 is an input terminal, 2 is an output terminal, 3 is an effective value circuit, 4 is a bass
band pass filter, 5 is a voltage controlled amplifier circuit, 6 is an addition circuit, and 7 is a
minute level detection circuit , 8 is a maximum value detection circuit, 9 is a logarithmic
conversion circuit, and 10 is an inverse logarithmic conversion circuit.
[0009]
In FIG. 1, the effective value of the signal input to the input terminal 1 is detected by the effective
value conversion circuit 3, the detected output is input to the minute level detection circuit 7, and
the output of the minute level detection circuit 7 is effective. The output of the digitizing circuit 3
is compared by the maximum value detection circuit 8 and output.
Therefore, the voltage control type amplification circuit 5 which receives the output of the lowpass filter 4 at the output of the maximum value detection circuit 8 is controlled, the output
signal and the source signal are added by the addition circuit 6 and the output terminal 2 Output
more.
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[0010]
In FIG. 2, the effective value of the signal input to the input terminal 1 is detected by the effective
value conversion circuit 3, the detection output is nonlinearly converted by the logarithmic
conversion circuit 9, and the detection output at the minute level is The enlarged and converted
detection output is input to the minute level detection circuit 7, the output of the minute level
detection circuit 7 and the output of the rms value conversion circuit 3 are compared by the
maximum value detection circuit 8, and the output is inversely logarithmic transformed The
circuit 10 performs inverse logarithmic conversion and outputs.
Then, the output of the maximum value detection circuit 8 is controlled by the voltage control
type amplification circuit 5 which receives the output of the low pass filter 4 and the output
signal and the source signal are added by the addition circuit 6 to obtain the output terminal 2
Output more.
Thereby, the detection accuracy of the minute level detection unit in the embodiment of FIG. 1
can be improved, and the variation in quality at the time of commercialization can be reduced.
[0011]
The present invention is not limited to the above embodiment, and based on the gist of the
present invention, for example, a voltage control type amplifier circuit may be made current
control type, or averaging instead of an effective value circuit. Various modifications such as
using a circuit are possible, and these are not excluded from the scope of the present invention.
[0012]
As described above in detail, according to the present invention, according to the effective value
of the input signal, the voltage controlled amplifier circuit is controlled to adjust the amount of
enhancement of the bass region, so that any volume can be used. While effective bass
enhancement can be achieved, the effect of suppressing the enhancement effect at the time of
excessive volume and reducing the sense of distortion can be obtained.
The difference between the enhancement characteristics of the conventional fixed rate type as
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shown in FIG. 5 is shown in FIG.
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