JP2830695B2 - Karaoke equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a karaoke apparatus for singing along with accompaniment.

[0002]

2. Description of the Related Art A karaoke apparatus which sings along with the accompaniment while playing a desired music tends to be more and more popular as a simple entertainment for many people. In a normal karaoke apparatus, an accompaniment amplification system for an accompaniment signal (music) input from a source and a singing amplification system for a singing signal (vocal) input from a microphone are provided independently, and the gains of both amplification systems are provided. Can be adjusted individually.

For example, a conventional karaoke apparatus shown in FIG. 6 is composed of a CD (Compact Disc), an LD (Laser
An accompaniment signal read from a source such as a disc) or a tape (tape) through the selector 1 is amplified by the source voltage amplifier 2 and then the level is adjusted by the source level adjusting volume 3 to be input to the mixing amplifier 8. After the singing signal input from the microphone 4 is amplified by the microphone amplifier 5, the signal is processed by the microphone echo circuit 6 and the like, and then the level is adjusted by the microphone level adjusting volume 7 and input to the mixing amplifier 8. A singing amplification system. The latter stage of the mixing amplifier 8 is a power amplifier 9, which constitutes a mixed amplification system for driving a speaker 10.

When such a karaoke apparatus is used, the user sets the accompaniment reproduction level and the singing reproduction level appropriately during karaoke performance and mixes the karaoke to ensure that the melody and rhythm of the accompaniment can be recognized. It is possible to enjoy one's own singing on your own. However, if the accompaniment playback level is set small so that it can be easily sung, the overall sound pressure in the non-singing part (the prelude, the interlude, and the back) is reduced by the lack of the singing voice, and the volume flowing from the speaker is reduced. I feel unsatisfactory. Conversely, when the accompaniment reproduction level is set to be large in advance so as to compensate for the unsatisfactoryness of the non-singing part, the total sound pressure increases by the amount of the singing voice added to the singing part. As a result, the listener feels noisy, and the singer does not easily recognize his or her singing voice, and therefore cannot sing comfortably.

[0005]

In order to solve the above-mentioned problem in setting the accompaniment reproduction level, the accompaniment reproduction level after the start of the performance is not fixed, but is set small in the singing part and large in the non-singing part. Just change it. However, since the conventional karaoke apparatus is of the type in which the volume control volume 3 for accompaniment is manually adjusted, it is not realistic to frequently change the accompaniment reproduction level during the performance. The present invention provides a karaoke having a function of automatically changing an accompaniment reproduction level so as to make it easier to sing by suppressing an accompaniment reproduction level in a singing portion and increasing an accompaniment reproduction level in a non-singing portion so as not to feel unsatisfactory. It is intended to provide a device.

[0006]

A karaoke apparatus according to the present invention includes a singing amplification system (5, 6, 7) for amplifying a singing signal input from a microphone, and an amplifying and controlling an accompaniment signal input from a source. Signal (CTL)
Amplification system (1, 2, 3) whose output is adjusted and a mixed amplification system (8,
9), the presence or absence of a singing signal is detected to determine the singing part and the non-singing part, and the singing part is used to detect the accompaniment amplification system (1, 2, 3).
And a singing determination unit (20A) that outputs a control signal (CTL) so as to decrease the input signal . Book
The karaoke apparatus of the invention also includes a singing input from a microphone.
Singing amplification system (5,6,7) that amplifies the signal and the source
Amplify the accompaniment signal input from the
L), the gain of which is adjusted by the accompaniment amplification system (1,
2, 3) and the output of both amplification systems are mixed to drive the speaker
Mixed amplification system (8, 9) and singing accompanying accompaniment signal
Identify the information to determine the part, non-singing part, and in the singing part
To lower the gain of the accompaniment amplification system (1, 2, 3)
A singing determination unit (20B) that outputs a control signal (CTL);
It is characterized by having .

[0007]

The singing determination unit automatically determines the singing part and the non-singing part of the accompaniment signal. Accompaniment amplification system varies the gain in response to the control signal from the singing determination unit. Therefore, when the control signal from the singing detector indicates singing portion (non-vocal parts), controlling so as to decrease the gain of the accompaniment amplification system (increase) in the song portions to facilitate sing suppressed accompaniment playback level In addition, in the non-singing part, the accompaniment reproduction level can be raised so that the user does not feel unsatisfactory, and an effective karaoke sound field can be realized. In order to change the gain of the accompaniment amplification system, for example, a method of uniformly controlling the gain regardless of the frequency band, or controlling the frequency characteristic so as to change the low-frequency emphasis characteristic is used.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of the present invention. In order to simplify the description, the karaoke apparatus shown in this embodiment has a singing amplification system 5 to 7 for amplifying a singing signal input from a microphone 4 and an accompaniment amplification system 1 for amplifying an accompaniment signal input from a source. 3 and the karaoke apparatus of FIG. 6 including the mixed amplification systems 8 and 9 for driving the speakers by mixing the outputs of the two amplification systems, and detecting the presence or absence of the singing signal. Adding a vocal detection circuit 20A that discriminates between singing and non-singing parts
, The control signal CTL from the vocal detection circuit 20A
When it is indicating the singing portion, in which the gain of the accompaniment amplification system to relatively reduce the frequency domain of the low frequency.

Source voltage amplification amplifiers for accompaniment amplification systems 1 to 3
2, specifically, whether the gain control circuit 21A shown in FIG. 3, Ru low frequency emphasis circuit 21B der shown in FIG. FIG.
Of the operational amplifier OP interposed between the input terminal IN and the output terminal OUT.
Is switched by the control signal CTL from the singing determination unit 20 (the vocal detection circuit 20A in FIG. 1 or the signal determination circuit 20B in FIG. 2 described later). The gain G of the operational amplifier OP is determined by the ratio of the feedback resistor R3 connected between the output terminal and the inverting input terminal to the ground resistance connected between the inverting input terminal and the ground. The grounding resistance are constantly connected is R 1, the gain at this time is represented by the following formula (1).

[0010]

G１ (R1 + R3) / R1 (1)

On the other hand, when the transistor T1 is turned on, the resistor R2 is connected in parallel with the resistor R1, so that the value of the ground resistor becomes a parallel combined value of R1 and R2 (R1 // R2). The gain at this time is expressed by the following equation (2).

[0012]

G２ (R1 // R2) + R3｝ / (R1 // R2) (2)

The value of the parallel combined value (R1 // R2) is smaller than the single resistance value R1. Therefore, the gain of equation (1) is small,
The gain in equation (2) is large. In the present invention, the gain may be reduced in the singing portion and the gain may be increased in the non-singing portion. Therefore, the transistor T1 is turned off in the singing portion, and the transistor T1 is turned on in the non-singing portion. Since the control signal CTL from the singing determination unit 20 becomes H (high) in the singing part and L (low) level in the non-singing part, the level is inverted by the transistor T2 to drive the transistor T1. With this configuration, the transistor T1 is turned off in the singing part and turned on in the non-singing part.

The low-frequency emphasizing circuit 21B of FIG. 4 switches the switch SW of the CMOS to the side when there is no microphone input (non-singing part) and to the side when there is microphone input (singing part) by the control signal CTL. When the switch SW is switched to the side (singing part), regarding the determination of the gain of the operational amplifier OP, since the resistors R1 and R2 dominantly act, the gain G is expressed by the following equation (3). The frequency characteristic at this time is flat as shown by the solid line in FIG.
Since this frequency characteristic has no band to be particularly emphasized, it is easy to recognize the melody of the accompaniment and is suitable for singing.

[0015]

G３ (R1 + R2) / R1 (3)

On the other hand, when the switch SW is switched to the side (non-singing part), the resistors R3 and R4 and the capacitor C1 dominantly determine the gain of the operational amplifier OP. It is represented by (4). The frequency characteristic at this time is such that the low band is emphasized as shown by the broken line in FIG. In this frequency characteristic, the low frequency range having a high sound pressure level is emphasized in the sense of hearing, so that the lack of the non-singing part can be compensated. Note that the resistors R5 and R6 are used to suppress a pop noise at the time of switch switching.
Ω.

[0017]

G {[{1 / (1 / R3 + jωC1)} + R4] / R1 (4)

[0018] such Thus, constitute <br/> the source over scan voltage amplifiers 2, in accordance with the control signal CTL from the vocal detection circuit 20A, automatically gain accompaniment amplification system at least some frequency bands By changing the karaoke device, the karaoke apparatus can be realized in which the accompaniment reproduction level is suppressed in the singing part to make it easier to sing, and the accompaniment reproduction level is increased in the non-singing part so that the user does not feel unsatisfactory.

FIG. 2 is a block diagram showing a second embodiment of the present invention. In this embodiment, a signal discriminating circuit 20B that detects a part identification signal accompanying an accompaniment signal and discriminates a singing part and a non-singing part is used as the singing determination unit 20. Since the part identification signal includes information for distinguishing a non-singing part (a prelude, an interlude, a backing part) and a singing part (vocal) of the accompaniment signal, the signal discriminating circuit 20B determines the singing part from the identification signal. / The non-singing part can be detected reliably and easily. In this case, the source voltage amplifier 2 may be the same as in the first embodiment. The signal determination circuit 20B outputs the same control signal CTL as the vocal detection circuit 20A,
The overall operation is the same as in the embodiment of FIG.

Since the vocal detection circuit 20A of FIG. 1 detects the presence or absence of a singing signal input from the microphone 4, the vocal detecting circuit 20A indirectly determines the singing portion and the non-singing portion of the accompaniment signal. Therefore, when there is no identification signal accompanying the accompaniment signal, the vocal detection circuit 20A is effective.

[0021]

As described above, according to the present invention, in the singing part, the accompaniment reproduction level is suppressed so as to make it easier to sing, and in the non-singing part, the accompaniment reproduction level is raised so as not to feel unsatisfactory. Thus, a karaoke apparatus having a function of changing the accompaniment reproduction level can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the present invention.

FIG. 3 is a circuit diagram illustrating a configuration of a gain control circuit.

FIG. 4 is a circuit diagram illustrating a configuration of a low-frequency emphasis circuit.

FIG. 5 is a characteristic diagram showing a frequency characteristic of the low-frequency emphasis circuit.

FIG. 6 is a block diagram showing an example of a conventional karaoke apparatus.

[Explanation of symbols]

1. Source selector 2. Source voltage amplification amplifier 3.
Source level adjustment volume, 4 microphone, 5 microphone amplifier, 6 microphone echo circuit, 7 microphone level adjustment volume, 8 mixing amplifier, 9 power amplifier, 10 speaker, 20 singing discrimination unit, 20A ... Vocal detection unit, 20B signal discrimination unit, 21A gain control circuit, 21B low-frequency emphasis circuit.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-10798 (JP, A) JP-A-3-41498 (JP, A) JP-A-60-156096 (JP, A) JP-A-2- 192259 (JP, A) Japanese Utility Model 4-13999 (JP, U) Japanese Utility Model 2-135962 (JP, U) Japanese Utility Model 58-189621 (JP, U) Japanese Utility Model 61-76558 (JP, U) SHIKAWA 59-63810 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G10K 15/04

Claims (2)

(57) [Claims] A singing amplification system (5, 6, 7) for amplifying a singing signal input from a microphone, and a control signal while amplifying an accompaniment signal input from a source.
Amplification system (1, 2, 3) whose gain is adjusted by signal (CTL), mixed amplification system (8, 9) that mixes the outputs of both amplification systems and drives speakers, and the presence or absence of a singing signal To detect singing and non-singing parts
And lower the gain of the accompaniment amplification system (1, 2, 3) in the singing part.
A karaoke apparatus comprising: a singing determination unit (20A) that outputs a control signal (CTL) so as to make the karaoke sound lower. 2. A singing signal inputted from a microphone is amplified.
Singing amplification system (5,6,7), which amplifies the accompaniment signal
Signal (CTL) whose gain is adjusted
System (1, 2, 3) and mixed amplification for driving the speaker by mixing the outputs of both amplification systems
System (8, 9) and information for determining the singing part and non-singing part accompanying the accompaniment signal
Singing part, and the accompaniment amplification system (1, 2, 3)
Output a control signal (CTL) to reduce
A karaoke apparatus comprising a singing determination section (20B) .