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DESCRIPTION JPH11344988

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DESCRIPTION JPH11344988
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
karaoke apparatus.
[0002]
2. Description of the Related Art A conventional karaoke apparatus has been provided with
various functions, but recently, a function of recording a singing voice of a singer (hereinafter
referred to as singing voice) has been required. In the case of recording a singing sound, a
singing sound and a background playing sound are present in the voice input to the microphone
because the singing is usually performed while listening to the karaoke performance sound, and
this is to be recorded.
[0003]
That is, in FIG. 3, the karaoke performance sound reproduced by the karaoke performance unit
21 is amplified by the amplifier 22 and emitted from the speaker 23 into the power performance
environment 20 such as the power performance room. In the microphone 25, in addition to the
singing sound, the sound 24 propagating and reflected in the force playing environment 20
mixes in the microphone 25, and the sound recording unit 27 records the force playing sound
other than the singing sound.
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[0004]
SUMMARY OF THE INVENTION In the conventional karaoke apparatus, there is a room for
improvement in that even if it is desired to record only singing sounds in the recording unit 27,
the force laquering performance sounds are also recorded.
[0005]
The present invention has been made in view of the above problems, and it is an object of the
present invention to enable recording of only a singing sound and to suppress howling by
extracting the singing sound.
[0006]
[Means for Solving the Problems] In order to achieve this object, the karaoke apparatus of the
first invention comprises the amplitude of the karaoke performance sound and the second
performance karaoke sound which is collected by reproducing the karaoke performance sound in
a karaoke environment. Detected by the amplitude detection circuit for detecting the ratio, the
delay detection circuit for detecting the delay time between the karaoke performance sound and
the second karaoke performance sound collected and collected by reproducing the karaoke
performance sound in the karaoke environment, and The delay adjustment circuit that delays the
karaoke performance sound by the delay time, the amplitude adjustment circuit that multiplies
the karaoke performance sound by the amplitude ratio detected by the amplitude detection
circuit, the second karaoke performance sound, the delay adjustment circuit, and the amplitude
adjustment circuit And an adder for adding the played karaoke sound.
[0007]
A karaoke apparatus according to a second aspect of the present invention is characterized in
that, in claim 1, the delay detection circuit and the amplitude detection circuit perform a
detection operation during the pre-play time of the karaoke song.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0009]
FIG. 1 is a block diagram showing an embodiment of a karaoke apparatus according to the
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present invention.
[0010]
In FIG. 1, the karaoke performance sound (digital signal) reproduced by the karaoke performance
unit 21 a is converted to an analog signal by the DA converter 1 and then amplified by the
amplifier 22, and the loudspeaker 23 performs power laquering performance environment 20
such as power laquer room. It is emitted inside.
In the microphone 25, in addition to the singing sound, the sound 24 propagating and reflected
in the force playing environment 20 mixes in the microphone 25.
The analog audio signal collected by the microphone 25 is amplified by the amplifier 26 and
converted to a digital signal by the AD converter 4, and then supplied to the amplitude detection
circuit 5, the delay detection circuit 6 and the adder 9.
The karaoke performance sound (digital signal) is also supplied from the karaoke performance
unit 21a to the amplitude detection circuit 5 and the delay detection circuit 6, and the amplitude
detection circuit 5 and the delay detection circuit 6 calculate the amplitude ratio and the delay
amount from both signals. To detect
[0011]
The delay detection circuit 6 detects the delay amount from both signals as described below.
First, the value Z (i) is obtained from the following equation.
Z (i) =. SIGMA. (Sk (j) * Sn (j + i)) i and j are positive integers.
The maximum value of Z (i) is determined, and the product of the value of i at that time and the
sample period Ts is the delay time td to be determined (see FIG. 2).
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[0012]
The amplitude detection circuit 5 detects the amplitude ratio from both signals as described
below. First, when the component of the karaoke performance sound (digital signal) supplied
from the AD converter 4 is Sn and the amplitude thereof is An, An = Σ (Sn (j + i0) 2) i0 is td / Ts.
td is the delay time. Ts is a sample period. It can be expressed.
[0013]
Assuming that the karaoke performance sound (digital signal) supplied from the karaoke
performance unit 21 a is Sk and its amplitude is Ak, Ak = Σ (Sk (j) 2). Therefore, An / Ak
becomes an amplitude ratio of both signals.
[0014]
The detection operation of the amplitude detection circuit 5 and the delay detection circuit 6 is
performed while the intro (pre-play) part is being reproduced. That is, most songs have a part
called intro (pre-play) for a while after the start of the karaoke performance, and in this part
there is no possibility that the singing sound enters the microphone, so the detection operation is
performed using this part In order to obtain the correct value.
[0015]
The amplitude ratio An / Ak determined by the amplitude detection circuit 5 is supplied to the
amplitude adjustment circuit 8, and the delay time td determined by the delay adjustment circuit
6 is supplied to the delay adjustment circuit 7. The delay adjustment circuit 7 delays the karaoke
performance sound (digital signal) supplied from the karaoke performance unit 21 a by the delay
time td and supplies the delayed signal to the amplitude adjustment circuit 8. The amplitude
adjustment circuit 8 multiplies the amplitude ratio An / Ak and supplies the product to the adder
9.
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[0016]
The signal at point x of the adder 9 is a composite signal of the singing sound and the signal
transmitted and reflected by the force laque performance sound and mixed in the microphone
25, and the signal at the point y is propagated and reflected and transmitted to the microphone
25. The signal at point z is (signal at point x)-(signal at point y), and a singing voice is generally
output. That is, as the output of the adder 9, a signal in which the sound 24 propagating and
reflected in the force playing performance environment 20 is canceled is obtained. This signal is
output to the digital recording unit 27 a via the switch 10.
[0017]
According to the embodiment described above, the karaoke performance sound input from the
microphone 25 can be erased internally. It is also possible to eliminate steady background noise
measured during intro performance. There is no impact on karaoke singing because it uses the
intro portion of the karaoke song to determine the erasure parameters. There is also an effect of
suppressing howling, which is typical for karaoke performances and singing.
[0018]
Also, by determining (measuring) the delay time until the karaoke performance sound is input to
the microphone and the amplitude value (erase parameter) at the time of intro, even if singing
voice and performance sound are mixed and input is erased internally And only singing sounds
can be recorded. Singing sound is known to be composed of lower frequency components
compared to the performance sound, and the capacity of the recorded data (the one obtained by
converting the recorded singing sound into digital data) using this sex Various digital signal
processing such as reducing
[0019]
As mentioned above, although this invention was demonstrated by embodiment, according to the
technical thought of this invention, it is possible to improve this invention by the following
means.
[0020]
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First, when karaoke performance is input to the microphone, the existence of a plurality of
erasure parameters may be considered, but the corresponding erasure scheme.
Second, an acoustic signal (Karaoke performance signal) propagating in the air may be
considered to have frequency characteristics, and this is a system in which the erasing parameter
is divided into a plurality of frequency bands. The third method is a combination of the above
first and second methods.
[0021]
In the embodiment described above, the processing by the digital circuit has been described as
an example, but the technical idea of the present invention can also be realized by the analog
circuit.
[0022]
As described above, according to the karaoke apparatus of the present invention, the amplitude
detection for detecting the amplitude ratio between the karaoke performance sound and the
second karaoke performance sound collected and collected by reproducing the karaoke
performance sound in the karaoke environment. A circuit and a delay detection circuit for
detecting a delay time between a karaoke performance sound and a second karaoke performance
sound collected and collected by the karaoke performance sound, and a karaoke performance
sound for a delay time detected by the delay detection circuit Delay adjustment circuit for
delaying, an amplitude adjustment circuit for multiplying the karaoke performance sound by the
amplitude ratio detected by the amplitude detection circuit, a second karaoke performance
sound, and a karaoke performance sound via the delay adjustment circuit and the amplitude
adjustment circuit Since an adder for adding is provided, it becomes possible to extract a singing
sound.
[0023]
As a result, it is possible to record only the singing sound and to suppress howling.
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