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JPH0616999

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DESCRIPTION JPH0616999
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
karaoke apparatus, and more particularly, to a karaoke apparatus capable of obtaining a karaoke
signal from, for example, a speaker drive signal output from a cassette deck or a CD player. It is a
thing.
[0002]
2. Description of the Related Art A karaoke signal as an accompaniment music signal can be
obtained electrically by canceling a vocal signal in a music signal. As a method thereof, for
example, a method of removing a frequency band in which a vocal signal is distributed by a filter
circuit or a method of mutually canceling vocal signals with phases of left and right channels
being opposite to each other are known.
[0003]
Generally, it is marketed as a karaoke tape or a karaoke disc, but recently it is connected to a
sound reproducing device such as a cassette deck or a CD player so that a karaoke signal can be
obtained from a music signal reproduced by the device. Karaoke equipment has been
commercialized.
[0004]
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However, in the conventional karaoke apparatus, the input signal is only an external output
signal outputted from, for example, an AUX terminal (auxiliary terminal) of the sound
reproducing apparatus.
Therefore, there is a problem that it can not be applied to a sound reproduction device that does
not have such an AUX terminal.
[0005]
SUMMARY OF THE INVENTION The present invention has been made in view of the abovedescribed conventional circumstances, and the structural feature thereof is that it is between the
sound reproducing apparatus main body including an amplifier and a sound output unit such as
a speaker. And an input unit connected to the sound output unit drive output terminal provided
in the sound reproducing apparatus main body or an auxiliary terminal for an external output
signal, and a sound emission input from the input unit. Attenuating circuit for attenuating the
level of the part driving output signal to the level of the external output signal, switch means for
selecting one of the output signal of the attenuating circuit and the external output signal, and
selected by the switch means A vocal signal removal circuit for removing a vocal signal included
in the signal, and an amplification circuit for amplifying an accompaniment music signal output
from the same vocal signal removal circuit and outputting the same to the sound emitting unit In
that an output unit comprising.
[0006]
In this case, a bypass circuit is provided between the input unit and the output unit to directly
output the sound emission unit driving output signal input to the input unit to the output unit
without passing through the attenuation circuit. Preferably, they are connected via the second
switch means.
[0007]
The input unit is connected to the sound output unit drive output terminal of the sound
reproducing apparatus main body, the switch means is switched to the attenuation circuit side,
and the output unit is connected to the sound output unit, for example, a speaker.
[0008]
For example, a speaker drive signal output from the sound output unit drive output terminal is
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input to the attenuation circuit through the input section, and the level is attenuated to the level
of the external output signal by the attenuation circuit.
[0009]
Then, the vocal signal is removed from the signal by the vocal signal removing circuit at the next
stage.
As a result, the accompaniment music signal is output from the vocal signal removal circuit, and
the accompaniment music signal is amplified to a level suitable for driving the speaker by the
amplifier circuit of the output unit and then supplied to the speaker.
[0010]
Thus, although a karaoke signal can be obtained from a speaker drive signal etc., when the
karaoke is not desired, the second switch means is turned on to directly drive the speaker drive
signal through the above-mentioned bypass circuit. It may be supplied to the output unit.
[0011]
When the external output signal of the sound reproducing apparatus is used as an input, the
external output signal is input to the vocal signal removing circuit without passing through the
attenuation circuit, and the output is not passed through the amplifying circuit. Output from the
output unit.
[0012]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present
invention will now be described with reference to the attached drawings.
The connection state at the time of use of this karaoke apparatus 1 is shown by FIG.
That is, the karaoke apparatus 1 is connected between the sound reproducing apparatus main
body MA including an amplifier and its sound output unit SP.
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In addition, although it is actually stereo wiring, the wiring is shown by a single line for
convenience of drawing.
[0013]
In this example, a main amplifier of a cassette deck is used as the sound reproducing apparatus
main body MA, and a speaker is used as the sound output unit SP.
The main amplifier MA is provided with two sound emission unit driving output terminals, that is,
a speaker terminal OUT1 and an earphone terminal OUT2, and an auxiliary terminal AUX for an
external output signal.
[0014]
Referring also to FIG. 2, the karaoke apparatus 1 has three input terminals 2a to 2c as the input
unit 2. As shown in FIG.
In this case, the input terminal 2a corresponds to the earphone terminal OUT2, the input
terminal 2b corresponds to the speaker terminal OUT1, and the input terminal 2c corresponds to
the auxiliary terminal AUX.
[0015]
Connected to the input terminal 2a is an attenuation circuit 3a for attenuating the level of the
earphone drive signal input from the terminal to a level equivalent to the level of the external
output signal output from the auxiliary terminal AUX.
[0016]
Similarly, an attenuation circuit 3b is connected to the input terminal 2b for attenuating the level
of the speaker drive signal input from the same terminal to a level equal to the level of the
external output signal.
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[0017]
The earphone drive signal and the speaker drive signal attenuated by the respective attenuation
circuits 3a and 3b and the external output signal inputted from the input terminal 2c are
alternatively inputted to the vocal signal elimination circuit 5.
[0018]
Therefore, three switching contacts are provided on the input side of the vocal signal removal
circuit 5, ie, the contact 4a connected to the output side of the attenuation circuit 3a, the contact
4b connected to the output side of the attenuation circuit 3b, and the input terminal A
changeover switch 4 having a contact 4c connected to 2c is provided.
[0019]
The vocal signal removal circuit 5 may be a known one, and for example, a method of removing a
frequency band in which the vocal signal is distributed by a filter circuit or in the case of stereo,
the vocal signal with the phases of the left and right channels as opposite phases. And so on.
[0020]
The accompaniment music signal from which the vocal signal has been removed by the vocal
signal removing circuit 5 is supplied to the output unit 6.
The output unit 6 is provided with an earphone connection terminal 6a, a speaker connection
terminal 6b, and an external output connection terminal 6c.
[0021]
In this case, the level of the accompaniment music signal output from the vocal signal removal
circuit 5 is preferably equal to the output level of the main amplifier MA, ie, the attenuation
circuit 3a, to the earphone connection terminal 6a and the speaker connection terminal 6b. The
amplifier circuits 7a and 7b are connected to amplify to the level before the attenuation by 3 and
3b, respectively.
[0022]
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Further, the earphone connection terminal 6a includes a bypass circuit which supplies the
earphone drive signal inputted to the input terminal 2a directly to the earphone connection
terminal 6a by bypassing the attenuation circuit 3a and the vocal signal removal circuit 5. The
changeover switch 8 is connected.
That is, the changeover switch 8 has two changeover contacts 8a and 8b, switching to the
contact 8a side selects the bypass circuit, and switching to the contact 8b side selects the output
of the amplifier circuit 7a.
[0023]
Similarly, the speaker connection terminal 6b includes a bypass circuit for supplying the speaker
drive signal input to the input terminal 2b directly to the speaker connection terminal 6b by
bypassing the attenuation circuit 3b and the vocal signal removal circuit 5. The changeover
switch 9 is connected.
The changeover switch 9 also has two changeover contacts 9a and 9b, and switching to the
contact 9a side selects the bypass circuit, and switching to the contact 9b side selects the output
of the amplifier circuit 7b.
[0024]
On the other hand, the external output connection terminal 6c is directly connected directly to
the output end of the vocal signal elimination circuit 5.
[0025]
Here, when it is desired to obtain the karaoke signal from the speaker drive signal of the main
amplifier MA, the input terminal 2b is connected to the speaker terminal OUT1 of the main
amplifier MA, and the switch 4 selects the contact 4b. Together with the changeover switch 9 to
the contact 9
[0026]
Thus, the speaker drive signal input from the input terminal 2b is attenuated by the attenuation
circuit 3b to the same level as the external output signal of the main amplifier MA, and the vocal
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signal elimination circuit 5 The vocal signal is removed, and an accompaniment music signal is
output from the vocal signal removal circuit 5.
[0027]
The accompaniment music signal is amplified to the original level by the amplifier circuit 7b, and
then supplied to the speaker SP from the speaker connection terminal 6b.
If karaoke is not desired, the changeover switch 9 may be closed to the contact 9a side.
As a result, the speaker drive signal output from the main amplifier MA is given as it is from the
speaker connection terminal 6b to the speaker SP.
[0028]
Similarly, by selecting the contact point 4a with the changeover switch 4 and setting the
changeover switch 8 to the contact point 8b side, a karaoke signal can be obtained from the
earphone drive signal.
If karaoke is not desired, the changeover switch 8 may be switched to the contact 8a side.
[0029]
On the other hand, when using an external output signal from the auxiliary terminal AUX of the
main amplifier MA, the switch 4 selects the contact 4c.
Thereby, the external output signal is directly input to the vocal signal removal circuit 5, and the
accompaniment music signal which is the output is taken out from the external output
connection terminal 6c.
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[0030]
According to this embodiment, when a speaker drive signal or an earphone drive signal is used,
the karaoke signal (accompaniment music signal) can be taken out from the external output
connection terminal 6c at the level of the external output signal.
[0031]
Conversely, when an external output signal from the auxiliary terminal AUX is input, the karaoke
signal is amplified by the amplifier circuit 7a or 7b, and the signal is taken out as a speaker drive
signal or an earphone drive signal. Can.
[0032]
As described above, according to the present invention, it is possible to cope with various signals
having different levels outputted from a sound reproducing apparatus such as a cassette deck or
a CD player, and hence an external output. The present invention can also be applied to a sound
reproduction device that does not have an auxiliary terminal for signal.
[0033]
Further, when karaoke is not desired, it is possible to bypass the speaker output signal such as a
speaker drive signal and output it as it is without the need for troublesome operations such as
wiring removal and only by switching the switch. Effects such as can be
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