JPS61230496A - Variable acoustic characteristic-typed pronounching device - Google Patents

Abstract

PURPOSE:To always obtain the most appropriate acoustic characteristic of a pronouncing sound wave by varying the acoustic characteristic with the frequency of the sound wave generated. CONSTITUTION:When a musical sound signal of f1Hz is generated at a signal source 7, the musical sound signal is amplified at an amplifier 8 and is converted to the sound wave by a speaker 9 and is emitted to the in-side of a variable aboustic characteristic speaker horn 12. Synchronizing with the above, a frequency detector 10 senses the musical sound signal from the signal source 7 as of f1Hz and transmits a control signal to a horn control device 11. The horn control device 1 receives the control signal from the frequency detector 10 and closes the aperture part 12b of the variable acoustic characteristic speaker horn 12. Next, when the musical sound signal of f2Hz is generated from the signal source 7, the frequency detector 10 senses the musical sound signal from the signal source 7 as of f2Hz and transmits the control signal to the horn control device 11. The horn control device 11 receives the control signal from the frequency detector 10 and opens the aperture part 12b of the variable acoustic characteristic speaker horn 12. Thus, by changing the acoustic characteristic of a speaker horn with the frequency component of the sound wave pronounced, various types of sound fields are performed in a space.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a variable-acoustic-characteristic sounding device that changes the acoustic characteristics in accordance with the frequency of a generated musical tone signal.

BACKGROUND OF THE INVENTION In recent years, sound generation devices have been produced using a method in which a reflector or a horn is attached to a speaker to provide various acoustic characteristics.

An example of the conventional sound generation device mentioned above will be described below with reference to the drawings.

FIG. 4 shows a conventional sound generating device. In FIG. 4, 1 is a signal source. 2 is an amplifier that amplifies the musical tone signal from the signal source 1; 3 is a speaker that converts the musical tone signal from the amplifier 2 into a sound wave; and 4 is a speaker horn that changes the acoustic characteristics of the sound wave emitted by the speaker 3. . The operation of the sound generating device configured as described above will be explained below.

A musical tone signal generated from a signal source 1 is amplified by an amplifier 2 and turned into a sound wave by a speaker 3 and radiated into the air through a speaker horn 4.

Figure ijfr5 shows how the sound waves radiated from the speaker horn diffuse into the room. 6th
In the figure, 6 is a sounding device, and 6 is a listener who listens to the sound emitted from the sounding device 6. The musical tones emitted from the sound generating device 6 are transmitted to the listener 6 as shown in FIG.

Problems to be Solved by the Invention However, with the above configuration, the acoustic characteristics of the sound waves emitted from the speaker 3 are uniformly determined by the speaker horn 4 regardless of the frequency of the sound waves emitted. However, there is a problem in that it is not possible to obtain a speaker horn effect with optimal acoustic characteristics for the frequency of the sound waves.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a variable acoustic characteristic sounding device that can vary the acoustic characteristics depending on the frequency of the generated sound waves, and can always have the optimum acoustic characteristics of the sound waves being emitted.

Means for Solving the Problems In order to solve the above problems, the acoustic characteristic variable sounding device of the present invention includes a signal source, an amplifier, a speaker, a frequency detection device, a horn characteristic control device, and an acoustic characteristic. It is equipped with a variable horn.

Effect of the Invention With the above-described configuration, the present invention can change the acoustic characteristics of the horn depending on the frequency of the generated sound waves, and can always create an optimal acoustic effect for the sound waves being generated.

Embodiment Hereinafter, an acoustic characteristic variable sounding device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of a variable acoustic characteristic type sounding device according to a first embodiment of the present invention.

In FIG. 1, 7 is a signal source, 8 is an amplifier, and 9 is a speaker, which have the same configuration as the conventional example. 1o is a frequency detection device that detects the frequency of the musical tone signal from the signal source 7 and outputs a signal according to the frequency; 11 is a horn control device that drives the acoustic characteristic variable horn in accordance with the signal from the frequency detection device 10; Reference numeral 12 denotes a variable acoustic characteristic speaker horn whose acoustic characteristics can be changed according to the output of the horn control device 11.

The operation of the acoustic characteristic variable sound generating device constructed as described above will be explained below with reference to FIGS. 1, 2, and 3.

Assume that a musical tone signal of 5 frHz is generated by the signal source 7. This musical tone signal is amplified by an amplifier 8 and a speaker 9
The speaker horn 12 is converted into sound waves with variable acoustic characteristics.
radiated inward. In synchronization with this, the frequency detection device 10 senses the musical tone signal from the signal source 7 as f, Hz, and sends a control signal to the horn control device 11. The horn control device 11 closes the opening 12b of the variable acoustic characteristic speaker horn 12 in response to a control signal from the frequency detection device 1o. At this time, the interior of the variable acoustic characteristic speaker horn 12 becomes a natural vibration system from the speaker 9 to the opening 121L, giving a certain effect to the musical tone component. At the same time, the sound waves radiated from the speaker 9 are transmitted through the opening 12b of the acoustic characteristic variable horn 12.
It has an acoustic characteristic in that it is not emitted from the opening, but is emitted only from the opening 121L, and then diffuses and propagates. In other words, the speaker horn 12 has an opening 12 inside the speaker 9.
A standing wave is created between the distances to &, and at the same time the opening 12
A sound field is formed only by the sound radiated from 1L. FIG. 2 illustrates this situation.

Next, assume that the signal source 7 generates a musical tone signal of ft Hz (ft\f+)o. This musical tone signal is amplified by an amplifier 8, converted into a sound wave by a speaker 9, and radiated into a speaker horn 12 with variable acoustic characteristics. In synchronization with this, the frequency detection device 10 detects the musical tone signals f and H from the signal source 7.
z and sends a control signal to the horn control device 11. The horn control device 11 opens the opening 12b of the variable acoustic characteristic speaker horn 12 in response to a control signal from the frequency detection device 10. At this time, the interior of the variable acoustic characteristic speaker horn 12 is a natural vibration system layer from the speaker 9 to the opening 12b, which gives a certain effect to the musical tone component. At the same time, the sound waves emitted from the speaker 9 have acoustic characteristics such that they are emitted from both the opening 121L and the opening 12b of the acoustic characteristic variable horn 12, and are diffused and propagated. In other words, the speaker horn 12 creates a standing wave within the distance between the speaker 9 and the opening 12b, and at the same time, the sound radiated from the opening 12& and the sound radiated from the opening 12b interfere with each other. In this case, the listener will be placed in a different acoustic space than when the above-mentioned f, Hz sound is emitted from the opening 12& of the speaker horn 12, and this situation is illustrated in the diagram. This is shown in Figure 3.

By changing the sound field, various sound fields are formed in the space, creating a more varied and vivid sound field feeling than ever before.

Listeners can enjoy a sense of realism.

In addition, in the embodiment, the acoustic characteristic variable speaker horn 12
Although the opening part of the horn is made variable, the speaker horn 12 with variable acoustic characteristics may have variable directivity of the horn, or may have a variable shape of the horn.

Effects of the Invention As described above, the present invention provides a speaker horn with variable acoustic characteristics, a frequency detection device, and a horn control device to form various sound fields in the space, creating a more varied and vivid sound field. You can get a sense of realism.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the acoustic characteristic variable type sound generating device according to the first embodiment of the present invention, and FIG. 2 is a block diagram of the acoustic characteristic variable type sound generating device of FIG. Fig. 3 is a schematic diagram of the sound wave transmitted into the air from the acoustic characteristic variable type sound generating device shown in Fig. 1, with the opening 12b opened and the sound waves from both the opening 12 & and the opening 12b transmitted into the air. FIG. 4 is a block diagram of a conventional sound generation device, and FIG. 6 is a schematic diagram when sound waves are transmitted into the air from the sound generation device of FIG. 4. 7...signal source, 8...amplifier, 9...
... Speaker, 10 ... Frequency detection device, 11 ... Horn control device, 12 ...
Speaker horn with variable characteristics. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3

Claims (1)

[Claims] a signal source and an amplifier that amplifies the electrical signal from the signal source;
A frequency detection device detects the frequency component of an electrical signal from a signal source and outputs a different horn control signal depending on the frequency component, and the horn control signal from the frequency detection device is input to detect the acoustic characteristics of the horn. What is claimed is: 1. A variable acoustic characteristic sounding device comprising: a horn control device for changing the acoustic characteristics; and a speaker having a variable characteristic speaker horn connected to the amplifier and the horn control device.