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JPS6343500

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DESCRIPTION JPS6343500
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
deep bass reproduction system for improving bass reproduction performance of compact audio
and audio visual equipment and the like. Prior Art In recent years, with the release of digital
sources, the reproduction of deep bass has attracted attention. Hereinafter, description will be
made with reference to the drawings. A first prior art example is shown in FIG. The output signal
S1 of the reproducing apparatus 21 such as a radio signal still taped becomes a signal S2 whose
power is amplified by the amplifier 22, and the electric sound is converted by the speaker 23 to
reproduce the sound wave M. FIG. 6 shows the frequency characteristic of the output signal S1 of
the reproduction device 21. In FIG. The horizontal axis shows the frequency, the vertical axis
shows the voltage level, the frequency characteristic of the output signal S1 is L1, and the low
frequency cutoff frequency determined by the performance of the head of the reproducing
apparatus 21 is fl and low frequency. Areas not to be reproduced are indicated by A1. The area
A1 which is not reproduced in the low range becomes wide in a low price reproduction
apparatus, and as a result, the speaker 23 can not reproduce the area A1 although it has the
ability to reproduce the area A1. On the other hand, there is also a low-frequency component
included in the source itself reproduced by the reproduction device 21. That is, it is impossible in
principle to reproduce the deep bass in the conventional example shown in FIG. 5 with a source
that does not include the low band 0. Then, for the second conventional example, using FIG.
explain. The output signal S1 of the reproducing apparatus 21 is branched into two by the
branching means 28, and one of the two branched signals is input to the amplifier 22, poweramplified to become a signal S2, and reproduced by the speaker 23. The other signal of each of
the two branched signals is input to a low pass filter (hereinafter abbreviated as LPF) 24 and
becomes, for example, a signal S3 including only frequency components of 150 Hz or less, and
the signal S6 power-amplified by the amplifier 26. 0, the second conventional example
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1
reproduced by the speaker 27 is generally known as a 3D system. Problems to be Solved by the
Invention However, even in this conventional example, there is a drawback that the area A1
shown in FIG. 6 can not be reproduced. That is, the low band characteristics determined by the
output signal S1 of the conventional reproduction device 21, ie, the input signal of the amplifier
22, that is, hardware conditions such as the head characteristics of the reproduction device 21
and the low band of the source reproduced by the reproduction device 21. The low frequency
characteristics determined by software conditions such as the presence or absence of
components have a problem that the low frequency region is not reproduced while the speaker
23 has a reproduction capability.
An object of the present invention is to provide a deep bass reproduction apparatus capable of
improving the conditions of low frequency characteristics determined by the hardware
conditions of the reproduction apparatus and the software conditions of the source in view of the
above problems. Means for Solving the Problems In order to achieve the above object, the
present invention provides a reproduction device, an arithmetic circuit for subtracting a 2channel output signal of the reproduction device, an LPF which receives an output of the
arithmetic circuit, and an output of the LPF And a pitch conversion circuit which halves the
frequency of the output signal with respect to the frequency of the input signal. Operation The
present invention is an arithmetic circuit for subtracting the 2-channel signal of the playback
apparatus according to the above-described configuration, and attenuates the audio 1a recorded
at almost the same level of the 2-channel signal to the audio signal. The low frequency
component included in the output signal of the reproduction apparatus is prevented by the pitch
conversion circuit which prevents the generation of distortion when the pitch conversion is
performed and halves the frequency of the output signal with respect to the frequency of the LPF
and the input signal. It performs pitch conversion that halves the frequency, and can play deep
bass. EXAMPLES Examples of the present invention will be described with reference to the
drawings. FIG. 1 is a block diagram of a deep bass reproduction system according to a first
embodiment of the present invention. In FIG. 1, the 2-channel output signals SL and SR of the
reproducing apparatus 1 are branched into two by branching means 1L and 1R. One of the
branched outputs of the output signal SLK is input to the amplifier 2 to be a power-amplified
signal S 2 and reproduced by the speaker 3. The other branched output is input to one of two
input terminals of the arithmetic circuit 10. As for the output signal SR, one of the branched
outputs is input to the amplifier 9 and power-amplified to become a signal S1o, which is
reproduced by the speaker 8 and compared. Further, the other branched output is input to the
other two input terminals of the arithmetic circuit 1Q. The arithmetic circuit 10 has a subtracting
function for the two manual signals, and performs subtraction while controlling the phase and
level of the two manual signals so as to minimize the value of the output signal S7 of the
arithmetic circuit 1o. As a method or a simple method, a method using only a subtraction circuit
may be considered. That is, this arithmetic circuit 1 ° can attenuate voice signals such as vocals
recorded at almost the same level as the output signals SL and SR of the reproducing apparatus
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2
1. The reason why the arithmetic circuit 10 is used is that the frequency of the output signal is
reduced to half of the frequency of the input signal by the pitch conversion circuit 5 described
later, so that distortion occurs when the audio signal is included in the input signal. Since it was
found by experiment, it is a thing to prevent the occurrence of the distortion.
By inputting the output signal S end of the arithmetic circuit 1o to LP11, the signal is converted
into an output signal S3 having only a reduced component. As a result of trial listening, it has
been found that the cutoff frequency of the LP11 is optimum around 150 庵. Next, the output
signal S3 of the LP 11 is converted into a signal S8 whose frequency is half of the frequency of
the input signal S3 by the pitch conversion circuit 6 which halves the frequency of the output
signal with respect to the frequency of the input signal. That is, the signal S8 is obtained by
moving the deacidification contained in the output signal S1 of the reproduction device 1 by one
octave. That is, when the frequency of the signal S1 is 100, the frequency u50) -12 of the signal
S8 is obtained. In other words, it is possible to convert it into a deep bass signal by moving only
the low band component signal one octave lower. Next, voltage levels and frequency
characteristics will be described with reference to FIG. As shown in FIG. 2, the deacidification
characteristic curve changes from Ll to L2, and its cut-off frequency also moves from fl to 12 by
one octave. That is, the area A2 which can not be reproduced by the conventional configuration
can be reproduced. Thus, the output signal S8 of the pitch conversion circuit 5 is poweramplified by the amplifier 6 and reproduced from the spill cuff. FIG. 3 shows a block diagram of
a deep bass reproduction system according to a second embodiment of the present invention. In
this second embodiment, the output signal of LP11 is branched into two by means of twobranching means 4A, and one of the output signals is input to the pitch conversion circuit 5, and
an output having a frequency half the frequency of the input signal S3. The signal S8 is held and
input to one of the two input terminals of the adder 11, and the other output signal of the twoway branch 4A is not converted at all and is directly input to the other input terminal of the
adder 11 and output signal S11 is obtained, power is amplified by the amplifier 6, and
regeneration is performed at the time of power reduction. The second embodiment has a bass
reproduction function which is the feature of the second prior art shown in FIG. 7, and further
has a deep bass reproduction function by the pitch conversion circuit 5, from low to ultra low.
Has a feature that can play a large range of deep bass. Note that the loudspeaker 7 shown in the
embodiments of FIGS. 1 and 3 has a bass-reproduction effect, as long as it is a dedicated louver
that can reproduce mainly the super low frequency called a super woofer. It can be achieved
well. Next, FIG. 4 shows a block diagram of a deep bass reproduction system according to a third
embodiment of the present invention. In the third embodiment, the output signal S13 is obtained
by the adder 12 which adds the output signals SL and SR of the reproducing apparatus 1 through
the two branching means 12L and 12R, and the LPF 13 is caused to pass only the low band of
the signal S13. An output signal S12 is obtained, and the output signal S8 of the pitch conversion
circuit 6 and the output signal 312 of the LPF 13 are added to the adder 11 by the input [2] to
obtain an output signal S11.
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3
Further, the power is amplified by the amplifier 6 and regenerated by the spill cuff. Unlike the
second embodiment, this $ 3 embodiment uses the output signal S13 of the adder 12 as the
input of L p F 13. Therefore, basically, the output of the arithmetic circuit 10 which is a reducer,
is an adder. The advantage is that there are more bass components than the second embodiment
in which the signal is input to the LP11 7 than the second embodiment. One more point is that in
the description of each of the above embodiments, the pitch converter 5 has an input signal For
frequency 1. Function to halve the frequency of the output signal (ear, J,: ')') and i-1, but it is
difficult to recognize that the bass component alone perceives the pitch, judging from the
experience, pitch conversion Even if the device 6 has a function of reducing the frequency of the
output signal relative to the frequency of the long-term signal, the deep bass reproducing device
functions sufficiently. As described above, according to the present invention, by providing the
pitch conversion circuit for reducing the frequency of the low frequency signal of the signal
obtained by subtracting the two-channel signals of the sources from each other, some of the bass
component of the source is reduced. Since heavy bass can be reproduced regardless of the above,
compared to the conventional example, even with the same source and reproduction device, it is
possible to enjoy well reproduced bass sounds. In particular, it is possible to reproduce the deep
bass even when the cassette deck or the movie source does not include the deep bass in
principle.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of a deep bass reproduction apparatus according to a first embodiment
of the present invention, FIG. 2 is a voltage level frequency characteristic diagram showing the
effects of the present invention, and FIG. 3 is a second embodiment of the present invention. FIG.
4 is a block diagram showing a deep bass reproduction apparatus, FIG. 4 is a block diagram
showing a deep bass reproduction apparatus according to a third embodiment of the present
invention, FIG. 5 is a block diagram showing a first prior art example, and FIG. FIG. 7 is a block
diagram showing a second conventional example, showing a voltage level frequency
characteristic diagram showing the effect of the example.
1 · · · · · · · playback device, 2, 8, 9 · · · · · · · · · amplifier · 3 ° 7.8 · · · · · · · · · · · · · · · · · · · · · pitch
conversion circuit, 4 ° 13 ----O-per X hole # (LPF), 1 o 31.9. . Arithmetic circuit, 11.12 ..... Adder.
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Name of agent Attorney Nakao Toshio 1 other cylinder 2 Figure 5 Figure 6 Plan 6 U
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