JPS5975792A - Musical performance device - Google Patents

Abstract

PURPOSE:To increase an acoustic output through simple constitution and to realize necessary acoustic characteristics by installing a speak part consisting of plural speakers in a common speaker box, and making the acoustic characteristics of the respective speakers different. CONSTITUTION:An amplifying means 3 mixes and amplifies the outputs of a tape recorder 2 and a microphone 1 to drive the 1st speaker 61 and the 2nd speaker 62 in common. Further, the speaker part 6 consists of the 1st speaker 61 and the 2nd speaker 62. For this purpose, the 1st speaker 61 and the 2nd speaker 62 are provided with different electroacoustic characteristics to obtain various overall acoustic characteristics. Further, when the necessary acoustic output is made constant, the composite sound of the speakers 61 and 62 increases by about 3dB in an intermediate and high frequency range as compared with a single speaker, so the output electric power of the amplifying means 3 is reduced correspondingly. Furthermore, the speakers 61 and 62 are made less in permissible input electric power than when they are used independently.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a performance device that sings into a microphone along with music played from a tape recorder or the like, and also amplifies and amplifies the audio signal from the microphone. It is.

Conventional configuration and its problems Performance devices that sing a song along with a music melody and amplify it electrically and acoustically have become popular in recent years. This is commonly known as a karaoke device.
For example, the music signal is reproduced by a tape recorder, amplified, and amplified by a speaker. This device sings along to this music into a microphone, and the audio signal from the microphone is simultaneously amplified and amplified for enjoyment.

A conventional performance device will be explained below. FIG. 1 is a configuration diagram of a conventional performance device, in which 1 is a microphone, 2 is a tape recorder, 3 is an amplification means, 4 is a speaker box,
6 is a speaker. The amplifying means 3 is connected to amplify the outputs of the tape recorder 2 and the microphone 1 to drive the speaker 6. speaker box 4
In order to enhance the acoustic characteristics of the speaker 6, it is constructed in a nearly sealed state, and also serves as a case for mounting the tape recorder 2.

With the above configuration, a music tape (not shown) is played back by the tape recorder 2, and the output thereof is amplified by the amplifying means 3 and amplified by the speaker 5. The voice signal of the microphone 1, which sings to the microphone 1 in accordance with the melody of the music, is mixed with the music signal by the amplifying means 3, amplified, and simultaneously amplified by the speaker 6. In this way, the joy of singing can be satisfied, and many listeners can enjoy the comfort and enjoyment of singing.

However, with the above configuration, the acoustic output of the speaker 6 must be increased in order to be heard by a large audience. In order to achieve this, it is necessary to increase the electrical output of the amplifying means 3, which makes the amplifying means 3 itself expensive, as well as the power source (not shown) that supplies power to it. . Furthermore, the speaker 6 is expensive because it must have a large allowable input power and a high electric/acoustic conversion efficiency. Furthermore, the higher the input power and the higher the frequency, the more easily the diaphragm (not shown) of the speaker 6 undergoes split vibration, and as shown in the acoustic frequency characteristic diagram shown in Fig. Unevenness P occurs. As a result, sounds of specific frequencies were either strengthened or weakened, resulting in unpleasant sounds. On top of that, in order to improve the richness of the voice and the clarity of the voice, we add a medium range (for example, 20
It is desirable for performance equipment to have a sound pressure level higher than that in other frequency ranges (0 hertz to 2 kilohertz), but
Since it is technically difficult to match the acoustic characteristics of the speaker 6, the electrical characteristics of the amplification means 3 must be set in such a manner, which poses problems such as the amplification means 3 becoming even more expensive. OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a performance device that can increase the acoustic output with a simple configuration and realize the necessary acoustic characteristics.

Structure of the Invention The present invention is a performance device that has a speaker section in which a plurality of speakers are installed in a common speaker box, and increases the acoustic output by driving each speaker in common, and improves the acoustic characteristics of each speaker. This makes it possible to obtain the overall acoustic characteristics required for the device by making the difference different.

DESCRIPTION OF THE EMBODIMENTS FIG. 3 shows the configuration of a performance apparatus in an embodiment of the present invention. In FIG. 3, 1 is a microphone, 2 is a tape recorder, 3 is an amplifying means, 4 is a speaker box, 6 is a speaker section, 61 is a first speaker, and 62 is a second speaker, as in the conventional example shown in FIG. It's a speaker. The amplifying means 3 is connected to mix and amplify the outputs of the tape recorder 2 and the microphone 1, and to drive the first speaker 61 and the second speaker 62 in common. Actually, the speaker section 6 is composed of a first speaker 61 and a second speaker 62.

The first speaker 61 and the second speaker 62 are installed inside the speaker box 4.

With the above configuration, the tape recorder 2 plays back a music tape (not shown), and the me-sic signal is amplified by the amplifying means 3 and supplied to the first speaker 61 and the second speaker 62. . On the other hand, while listening to the music, the voice signal from the microphone 1, which is sung along with the music, is mixed with the music signal and amplified by the amplifying means 3. As a result, the first speaker 61 and the second speaker 62 mix and amplify the US--Sick audio. Both the singer and the audience can enjoy the song together.

Here, by providing a difference in the electrical/acoustic characteristics of the first speaker 61 and the second speaker 62, various overall acoustic characteristics can be obtained. For example, if the sound pressure frequency characteristics of the first speaker 61 are those shown in Figure 4, and those of the second speaker 62 are those shown in Figure 4B, the respective sounds will be synthesized as shown in Figure C. The sound has a unique characteristic. That is, if the lowest resonance frequency of the first speaker 61 is set to a higher frequency than that of the second speaker 62, the phase and amplitude of each sound pressure will differ in the low frequency range (260 Hz or less) as shown in FIG. The level will be as shown in C. Also,
In the medium and high frequency range (250 Hz to 2 kHz), sounds with the same phase and amplitude are synthesized, and Figure 4 A'! , or the sound pressure shown in FIG. 4C, which is 3 decibels higher than B. Furthermore, in the high frequency range (2 kHz or higher), the diaphragm (not shown) of each speaker tends to vibrate in a divided manner, and both A and B in Figure 4 have uneven characteristics, but the frequencies at which the concavities and convexities occur are different. If so, the synthesized sound will be the vector sum of the respective sound pressures, and will be flattened as shown in Figure 4C, and its level will be lower than that in the middle and high frequency range. In other words, overall, as shown in Figure 4C, the sound pressure in the mid-high frequency range is high, the high frequency range has few irregularities, and the sound pressure is at a level slightly lower than that in the mid-high frequency range, making it a singer's voice suitable for performance equipment. It produces an ideal sound that doesn't get tired even if you listen to it for a long time.

On the other hand, the first speaker 61 and the second speaker 6
If the sound pressure frequency characteristics of 2 are set to be the same as shown in FIG. 4A, the unevenness of the characteristics will be emphasized in the high frequency range, resulting in a very unpleasant sound. Furthermore, in the low frequency range, the bass is insufficient and the sound becomes less full. Furthermore, if speakers with sound pressure frequency characteristics as shown in Figure 4B are used for the first speaker 61 and the second speaker 62, the irregularities in the characteristics will be similarly emphasized in the high frequency range, resulting in unpleasant sound. At the same time, in the low frequency range, the bass level increases, causing the sound to become muffled and making it difficult for voices to pass through.

Next, the output power of the amplifying means 3 and the first speaker 6
The allowable input power of the first and second speakers 62 will be explained. Assuming that the required acoustic output is constant, the synthesized sound of the first speaker 61 and the second speaker 62 will increase by about 3 de/bel in the medium and high frequency range compared to the sound of the first speaker 61 and the second speaker 62 alone, so the output power of the amplification means 3 will be increased by that amount. In addition to being small in size, it does not require special frequency characteristics, so it can be constructed at low cost. Still, the allowable input power of the first speaker 61 and the second speaker 62 can be made smaller than when they are used alone, and each speaker can be manufactured at low cost.

Note that although the first speaker 61 and the second speaker 62 are added inside the speaker box 4, they have different sound pressure frequency characteristics, so mutual interference through the air inside the speaker box 4 is prevented. Therefore, a sound suitable for the performance device can be obtained without providing a baffle plate between the first speaker 61 and the second speaker 62.

In the above explanation, we mainly talked about sound pressure frequency characteristics, but if the characteristics of the first speaker 61 and the second speaker 62 are made different in terms of other characteristics such as transient response characteristics and distortion characteristics, the performance device will be further improved. Sometimes you can get the right sound.

Effects of the Invention As described above, the present invention increases the acoustic output in the medium and high frequency range by installing a speaker section consisting of a plurality of speakers in a common speaker box, and using speakers with different acoustic characteristics for each speaker. This has the excellent effect of reducing the adverse effects of the divided vibration of the diaphragm in the high frequency range, and providing ideal characteristics as a performance device with less muffled sound in the low frequency range.

In addition, since multiple speakers are used, the acoustic output is higher than when using a single speaker, and the output power of the amplification means and the allowable input power of each speaker can be reduced by that amount, making the device more efficient. It can be constructed at low cost.

Furthermore, since the characteristics of each speaker are made to differ without interrupting the space between the speakers in the speaker box, mutual interference does not occur, and the effect is great.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a conventional performance device, FIG. 2 is a sound pressure frequency characteristic diagram, FIG. 3 is a configuration diagram of a performance device according to an embodiment of the present invention, and FIG. 4 is a same sound pressure frequency characteristic diagram. . 1... Microphone, 2... Tape recorder, 3... Amplifying means, 4... Speaker box, 6... Speaker unit, 61... ...
-First speaker, 62...Second speaker. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Fig. 4 Fig. 2 tL comparison f (lh) Fig. 3 1 Fig. 4 Ifl 晟叡f (Hz)

Claims (1)

[Claims] It has an amplifying means for amplifying music signals and microphone signals, and a speaker section composed of a plurality of speakers installed in a common speaker box, and the amplifying means commonly drives each speaker of the speaker section, and each A performance device characterized by speakers having different acoustic characteristics.