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JPS63164794

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DESCRIPTION JPS63164794
[0001]
INDUSTRIAL FIELD OF THE INVENTION The present invention relates to a device for
reproducing deep bass such as audio and audio visual equipment etc. 0 Conventional technology
In recent years, digital media typified by CD (compact disc) has been put on sale. Attention has
been focused on the reproduction of very low frequency areas, particularly the so-called deep
bass range. At the same time, the speed of the world is fast, and accordingly, there is a growing
demand for audio and audio visual devices 2 to be reproduced at high speed and to be heard
with natural sound quality. Hereinafter, description will be made with reference to the drawings.
FIG. 3 shows a first conventional example in which the deep bass region is not reproduced. The
output signal S1 of the reproducing apparatus 1 such as a VTR (video tape recorder) or a tape
recorder becomes a signal S2 amplified in power by the amplifier ?, and is electroacoustically
converted by the speaker 8 to reproduce the sound wave M. FIG. 4 shows the frequency
characteristic of the output signal S1 of the reproducing apparatus 1. The horizontal axis
represents frequency, the vertical axis represents voltage level, and the frequency characteristic
of the output signal S1 is a low cut-off frequency determined by the performance of the head of
the reproducing apparatus 1 by fl at a low Regions not to be reproduced are indicated by Ll. The
area L1 which is not reproduced in the low range becomes wide in a low price reproduction
apparatus, and as a result, the speaker 8 can not reproduce the area L1 while having the ability
to reproduce the area L1. On the other hand, there is also a relationship between low-frequency
components included in the source itself reproduced by the reproduction device 1. That is, it was
impossible in principle to reproduce the deep bass by the conventional example shown in FIG. 3
with a source not including the low band. Therefore, FIG. 5 shows a second conventional example
having a function of reproducing the area L1 by providing a signal processing circuit to the area
L1 which is not reproduced as shown in FIG. The output signal S1 of the reproducing apparatus
1 is branched into two by the branching means 33, and the first output S34 thereof is inputted to
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the first input of the adding means 6 as it is. On the other hand, the second output SSS is changed
to the output signal SS + of only the low band component by the LPF 2 which passes only the low
band. The signal SS1 is converted to a signal S52 whose frequency is half of the frequency of the
input signal S31 by the pitch converter 6 which halves the frequency of the output signal with
respect to the frequency of the input signal. That is, the signal S52 is obtained by moving the low
band included in the output signal S1 of the reproducing apparatus 1 by an octave lower. In
other words, by moving the low range component signal by an octave lower, it is possible to
convert it into a deep bass component signal.
This will be described with reference to the voltage level frequency characteristic diagram shown
in FIG. The low frequency characteristic curve is changed from N1 to N2 by the pitch converter
5, and the cutoff frequency is also moved from r to f2 by an octave. That is, the component of the
region L2 can be reproduced. The output signal 852 of the pitch converter 5 is input to the
second input of the adder 6, and the signal S3S added by the adder 6 is amplified by the
amplifier 7 and reproduced from the speaker 8 as the sound wave V. Further, FIG. 7 shows a
third conventional example of an apparatus (hereinafter referred to as an early opening
apparatus) capable of reproducing at a higher speed than usual and having natural sound quality.
The signal Si1 input to the input terminal 21 is recorded by a recording / reproducing apparatus
22 such as a tape tape recorder or a VTR. The frequency eFs1 + of the signal S1j is set. In this
case, the frequency of the recorded signal is also the same FSll. The recorded signal is
reproduced at a speed v2 faster than the speed v1 recorded by the recording / reproducing
apparatus 22 to obtain a signal 822. Assuming that this signal 8220 frequency is 2822, the
equation (1) is satisfied. That is, when reproduced at a speed higher than normal, the pitch also
goes up, which makes it very difficult to hear. Therefore, first, an ordinary audio band component
is extracted to the LPF 3 and a signal S23 is obtained by removing the aliasing noise. With
respect to the frequency F5.23 of the input signal 823, the frequency F S24 of the output signal
S24? The convertible pitch converter 6 converts the pitch so as to obtain natural sound quality
even when reproduced at a higher speed than usual. The principle is described by equations (2)
and (3). The pitch conversion rate by the pitch converter 6 is V, that is, the input signal S1 + is
input to the input terminal 5, and the recording / reproducing device 22 has a speed faster than
usual, that is, a speed P faster than the speed when recorded. When the frequency of the output
signal is converted with respect to the frequency of the input signal by the pitch converter V by
the pitch converter 6 and the signal 824 is output to the output terminal 23, the following third
equation is satisfied. FSll и PV: FS24 ? ? ? ? иииии (3) In the equation (3), if P ?? = 1 is satisfied,
FS becomes FS24, and the signal S24 output to the output terminal 6 is an input terminal The
frequency is exactly the same as that of the signal S1 input to 5. For example, P = 2, that is, in the
case of double speed reproduction, V = ?, that is, the frequency of the output signal may be
halved with respect to the frequency of the input signal. Although the second prior art shown in
FIG. 6 and the third prior art shown in FIG. 7 have different functions, the output signal It has a
pitch converter that halves the frequency.
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A fourth prior art example in which the second prior art example and the third prior art example
are configured in the same apparatus is shown in FIG. The fourth prior art example shown in FIG.
8 becomes the second prior art example shown in FIG. 6 if the switch means 4 is connected to
the main terminal by the switch means 4, while the switch means 4 shown in FIG. Is connected to
the B terminal, it has a function capable of switching to the third prior art shown in FIG. Then, by
controlling the reproducing apparatus 1 with the control signal, the normal speed reproduction
or the speed reproduction faster than the normal speed is switched. Problems to be Solved by the
Invention However, in the above method, the fourth prior art has a problem that two pitch
converters having the same function are required. In view of the above-mentioned problems, the
present invention has a function of having a fast-earning function with natural sound quality
when reproducing a signal at a speed higher than usual with only one pitch converter, and
having a function of improving bass reproduction performance. The present invention provides a
bass reproduction apparatus. Means for Solving the Problems To achieve the above object, the
present invention extracts a normal audio band component and a first LPF for extracting only a
low frequency component of a reproduction device and its output signal, and removes aliasing
noise , The switch means for switching the outputs of the first LPF and the second LPF, and the
output of the switch means, the frequency of the output signal being half the frequency of the
input signal And a pitch converter. According to the above-described configuration, the present
invention extracts, for example, the 10th I and PF that extract only the low-frequency component
and the audio-band component from the output signal of a playback device such as a VTR or a
tape recorder, By means of the second LPF having the elimination function, the output signal of
the reproducing apparatus is separated into the first and second signals by the frequency
component, and either one of the first and second signals is selected by the switch means. The
frequency converter selects and halves the frequency of the output signal with respect to the
frequency of the input signal. For example, when the output signal of the first LPF is selected by
the switch means and input to the pitch converter, and the reproduction device is reproduced at
a normal speed, the output signal of the pitch converter is the output signal of the reproduction
device The frequency is halved with respect to the low frequency component of On the other
hand, when the output of the second LPF is selected by the switch means and input to the pitch
converter, and the playback device is played at twice the normal speed, the output signal of the
pitch converter is reproduced The speed is doubled, and the pitch can be made the same natural
sound quality as normal.
Examples of the present invention will be described below 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 output signal S1 of the reproducing apparatus 1 such as VTR or
tape tape is branched into three by the three-way branching means 41. The branched first signal
S41 is input to the first switch 40 input terminal by the first LPF 2 as the signal 545 from which
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only the low frequency component is extracted. On the other hand, the branched second signal S
<b> 42 becomes a signal '346 in which only the audio band component is extracted by the
second LPF 3, and is input to the input terminal B of the first switch 4. The branched third signal
S43 is input to the input terminal of the second switch 9. The first switch 4 and the second
switch 9 are selected by the external control input signal from either the input terminal or the
terminal B. The output signal S47 of the first switch 4 is input to the pitch converter 6, and
converted to a signal 848 whose frequency is reduced to half. The selection of the first switch 4
causes the signal 84 B to be completely different as follows. (1) When the first switch 4 selects
the input terminal by the external control input signal, the reproducing device 1 reproduces at
the normal speed by the external control input signal, the output signal 84 B of the pitch
converter 6 is The frequency of the low frequency range is further halved to become a deep bass
component. (2) When the first switch 4 selects the input terminal B in response to the external
control input signal, the reproduction device 1 reproduces at the normal double speed by the
external control input signal, so the output of the pitch converter 6 The signal 548 has a
reproduction speed doubled, and has the same natural sound quality as a normal pitch. The
output signal 848 is input to the first input terminal of the adder 6, and the output signal S49 of
the switch 9 of the force cylinder 2 is input to the second input terminal of the adder 6, and the
adder 6 is added. , And the power is amplified by the amplifier 7 and electroacoustically
converted by the speaker 8 to be reproduced as a sound wave V. The function of the second
switch 9 is that the content of the output signal 848 of the pitch converter 6 is only the bass
component only when the first switch 4 selects the input terminal for the external control input
signal, usually, The audio band component of the second switch 9 is completely eliminated, and
the component is added as the output signal S49 of the second switch 9. According to this
embodiment, the number of pitch converters is reduced from two to one by providing the first
switch 4 and the second switch 9 with exactly the same function as the fourth prior art shown in
FIG. It is possible.
FIG. 2 is a block diagram of a deep bass reproduction system according to a second embodiment
of the present invention. In this second embodiment, unlike the first embodiment shown in FIG.
1, two speakers are provided, and one of them, the second speaker 11 is used as a heavy bass
reproduction only. Is to reproduce the sound wave ML. Also in this case, based on the external
control input signal, the output signal S5a of the LPF 2 and the output signal 5sse of the LPF 3
are switched by the first switch 4 and input to the pitch converter 5 and the frequency is reduced
by half by the pitch converter 6 It is As described above, according to the present invention,
when the reproducing apparatus is reproduced at a normal speed by switching the signal input
to the pitch converter for halving the frequency of the output signal with respect to the
frequency of the input signal. When the playback device is played at normal double speed, the
playback speed is doubled and can be output with the same natural pitch as the normal pitch, so
one of the two functions is It can be configured with a pitch converter, and the configuration can
be simplified, so that it can be manufactured inexpensively.
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[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of a deep bass reproduction system according to a first embodiment of
the present invention, and FIG. 2 is a block diagram of a deep bass reproduction system
according to a second embodiment of the present invention, FIGS. FIGS. 7 and 8 are block
diagrams showing the prior art, and FIGS. 4 and 6 are voltage level frequency characteristics
showing the effects of the prior art.
1 и и и и и и и playback device, 2, 3 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и 7 .1 o ........ Amplifier, 8.11. Name of agent Attorney Nakao Toshio and 1 other person
Fig. 3 Fig. 4 ? 10 1 1 ? ? ? l ? l Fig. 6
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