JPH0865800A - Acoustic reproduction device - Google Patents

Abstract

PURPOSE: To provide an acoustic reproduction device capable of making the difference of spatial impression due to the difference of reproducing volume small. CONSTITUTION: One speaker 12 is turned to the front of arbitrarily set sound emission space and at least more than one speakers 13 and 14 for auxiliary reproduction are arranged respectively on the right and left of the speaker 12. Then, the volume and a phase outputted from the respective speakers 13 and 14 for auxiliary reproduction are controlled corresponding to the reproducing volume in a state where the respective speakers 12, 13 and 14 are turned to a unit by a control circuit 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a sound reproducing device including a speaker system that emphasizes the spatial impression of reproduced volume.

[0002]

2. Description of the Related Art Conventionally, in the case of audio reproduction, there is a phenomenon in which the impression felt by a listener greatly changes depending on the volume (volume position) to be reproduced. This theory has been explained as follows. There is a so-called loudness curve in which the frequency characteristic that a human feels changes depending on the volume.

Based on this, as a conventionally used technique, a loudness circuit 1 as shown in FIG. 5 is known. The loudness circuit 1 reproduces an audio signal output from a sound source in a state where the characteristic of the frequency characteristic control circuit 3 is changed according to the position of the output volume 2 and outputs the signal from a speaker 5 via an amplifier 4. By using the loudness circuit 1 as described above, there is no change in the frequency characteristic perceived by humans due to the sound volume.

By the way, as a factor causing the loudness curve, it is generally said that the interval of the spatial resonance. For example, when the reproduced sound has a low volume, the spatial width cannot be sensed because the level of the reflected sound as the spatial information becomes smaller than the detection limit of human senses. In addition, when the reproduced sound is high volume, it is necessary to secure a wide space between the stereo left and right speakers and a space between the speaker and the listening position. In other words, the sound field is monaural unless it is heard in a large room. turn into.

Therefore, when importance is attached to low-volume reproduction,
It is generally said that a speaker system having a broad directivity is preferable, and when importance is attached to reproduction of a large volume, a speaker system having a sharp directivity is better.

[0006]

However, the conventional sound reproducing device does not sufficiently satisfy the effect of improving the above spatial factors.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sound reproducing device capable of reducing a difference in spatial impression due to a difference in reproduction volume.

[0008]

In order to achieve the object, the invention described in claim 1 is one speaker facing the front of an arbitrarily set sound radiation space, and at least one of the left and right sides of the speaker. And a control circuit for controlling the volume and phase output from the auxiliary reproduction speaker according to the reproduction volume.

[0009]

In the above-mentioned structure according to claim 1,
One auxiliary reproduction speaker facing one speaker and the front of an arbitrarily set sound emission space, and at least one auxiliary reproduction speaker is arranged on each of the left and right sides of the speaker, and each auxiliary reproduction speaker in a state where each speaker is unitized by a control circuit. The volume and phase output from is controlled according to the playback volume.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a sound reproducing device of the present invention will be described with reference to the drawings.

In FIG. 4, the sound reproducing device 10 is directed toward the front of the sound emitting space T which is arbitrarily set apart from the controller 11 having a tuner, a CD player and the like and the room space R, that is, toward the listener P. One installed speaker 12 and speakers 1 located on the left and right of the speaker 12, respectively.
Auxiliary reproduction speakers 13 and 1 arranged in a radial pattern with 2 and
4 and are electrically connected to the controller 11 in a state where each of the speakers 12, 13 and 14 is unitized and installed on the left and right of the indoor space R.

As shown in FIG. 1, the controller 11 includes a main volume 15, an attenuator (ATT) 16a,
16b, phase inverters 17a and 17b, amplifiers 18a and 1
8b, 18c, and CPU 19, the audio signal output from a sound source such as a tuner or a CD player is the state in which the output and phase of each speaker 12, 13, 14 are selected by the CPU 19 according to the volume setting value of the main volume 15. Is output with.

For example, when the volume setting value is small, the sound is output from each of the speakers 12, 13 and 14, and when the volume setting value is normal, the speaker 12 outputs the sound.
When the volume setting value is large, each speaker 12, 13, 1
Sound is output from 4.

That is, as shown in FIG. 1, the input signal of the voice that has passed through the main volume 15 is branched into three (when the auxiliary reproduction speakers 13 and 14 are two in one unit), and the speaker 12 is an amplifier. The amplified audio signal is output to 18a, and the auxiliary reproduction speakers 13 and 14 output the amplified audio signal to the amplifiers 18b and 18c via the attenuators 16a and 16b and the phase inverters 17a and 17b.

When the CPU 19 selects the output from the auxiliary reproduction speakers 13 and 14 according to the volume setting value of the main volume 15, the CPU 19 controls the attenuators 16a and 16b and the phase inverters 17a and 17b according to the operating characteristics. This CPU 19 and attenuators 16a and 16b
And the phase inverters 17a and 17b, the speakers 12 and 1
Main volume 1 with 3 and 14 unitized
Auxiliary reproduction speakers 13 and 14 according to the volume setting value of 5
And a control circuit 20 for controlling the output of the.

The operation characteristics of the attenuators 16a and 16b and the phase inverters 17a and 17b are as shown in FIG. 3 (A). The attenuators 16a and 16b in the low volume reproduction (range S1) are the main volume 15 The signal level is set to be the same as that of the signal that has passed through, and becomes gradually smaller as the volume shifts to the normal volume range, and becomes level 0 during normal volume reproduction (range S2). At this time, the phase inverters 17a and 17b pass the normal phase signal without performing the inverting operation (range W1).

When the volume is further increased from the normal volume reproduction to the high volume reproduction, the phase inverters 17a and 17b start the inversion operation, and the normal reverse phase signal is input to the auxiliary reproduction speakers 13 and 14. At the same time (range W2), the levels of the attenuators 16a and 16b gradually increase from level 0 to level 1.

Further, at this time, the speakers 12, 13, 1
As for the reproduction level of No. 4, as shown in FIG. 3 (B), the speaker 12 has a large volume at a constant inclination angle (dashed line), while the auxiliary reproduction speakers 13 and 14 have a small volume during reproduction. Up to the volume value, the volume increases with the speaker 12 at a constant inclination angle, and when the volume approaches the normal volume reproduction range, the volume level gradually decreases and becomes 0 at the normal volume reproduction. When the high volume is reproduced and the high-pitched sound is reproduced, the phase-inverted signal gradually increases from level 0 in proportion to the volume.

In FIG. 3A, the vertical axis represents the values of the attenuators 16a and 16b, and the horizontal axis represents the main volume 15.
3B, the vertical axis represents the volume level of the sound reproduced from each of the speakers 12, 13, and 14, and the horizontal axis represents the set volume value of the main volume 15.

In the above structure, the main volume 1
When the volume setting value of 5 is small, as shown in FIG. 2 (A), voices of the same phase are output from the speakers 12, 13 and 14, respectively, so that a wide directivity can be provided and the volume setting can be made. When the value is normal, as shown in FIG. 2 (B), the speaker 12 outputs the sound of the same phase, and the auxiliary reproduction speakers 13 and 14 do not output the sound, which is the normal reproduction system. When the volume setting value is large,
As shown in (C), the auxiliary reproduction speakers 13 and 14 output voices of opposite phases, and the speaker 12 outputs voices of the same phase. At this time, the sound waves are weakened in both sides of the sound emission of the speaker 12, and a sharp sound is output.

Therefore, it is possible to realize a wide sound field reproduction even with a small volume reproduction, and further, it is possible to realize a reproduction with good stereo balance in a large volume reproduction.
Further, the difference in sound quality due to the reproduction volume can be reduced.

[0022]

As described above, in the sound reproducing device according to the present invention, one speaker facing the front of the arbitrarily set sound emission space and at least one of the left and right sides of the speaker. A speaker for auxiliary playback placed,
By providing a control circuit for controlling the volume and phase output from each of the auxiliary reproduction speakers in a unitized state with the speaker and each of the auxiliary reproduction speakers, The difference in spatial impression caused by the difference can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a sound reproducing apparatus of the present invention and showing a schematic configuration of a main part.

FIG. 2 is an explanatory view schematically showing directional characteristics in the sound emission space during reproduction at low volume, (B) at normal volume, and (C) at high volume. is there.

FIG. 3A is a graph showing the operation characteristics of the attenuator and the phase inverter, and FIG. 3B is a graph showing the reproduction level characteristics of each speaker.

FIG. 4 is an explanatory diagram of a sound reproducing device installed in a sound emitting space.

FIG. 5 is a block diagram showing a conventional sound reproducing device and showing a schematic configuration of a main part.

[Explanation of symbols]

 10 ... Sound reproduction device 12 ... Speaker 13 ... Auxiliary reproduction speaker 14 ... Auxiliary reproduction speaker 15 ... Main volume 20 ... Control circuit

Claims (1)

[Claims] 1. A speaker facing the front of an arbitrarily set sound emission space, an auxiliary reproduction speaker arranged on at least one of the left and right sides of the speaker, and a volume and a phase output from the auxiliary reproduction speaker. And a control circuit for controlling the control according to the reproduction volume.