JPS5834880Y2 - 3D sound reproduction device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a stereo device that can expand a stereo sound field beyond the speaker spacing.

Conventionally, various stereo devices have been proposed in which the sum signal of left and right signals is emitted from a central speaker, and the difference signal is emitted from left and right speakers in opposite phases to each other in order to expand the sound field beyond the speaker spacing. .

The present invention provides a stereo device as described above, in which the spread of the stereo sound field can be freely adjusted with a simple configuration, and the sum signal can be replaced with another audio signal. This will be explained in detail according to the drawings.

FIG. 1 shows an embodiment of the present invention.

In the figure, stereo transmission signals L and R applied to input terminals 1 and 2 are converted into a sum signal (L+R) and a difference signal (L-R) by an adder circuit 3 and a subtracter circuit 4.

The sum signal (L+R) is applied to one terminal C of the variable resistor 5 and the adder circuit 7, and the difference signal (L-R) is connected in parallel to the other terminal a of the variable resistor 5 with opposite phases to each other. is applied to a power amplifier 11 that drives speakers 13 and 14.

The sliding terminal of this variable resistor 5 is grounded.

On the other hand, another audio signal input to the microphone 8 is amplified by the microphone amplifier 9, and its level is adjusted by the variable resistor 6.
It is added together with the sum signal (L+R) by the adder circuit 7, and the power is amplified by the power amplifier 10 to drive the speaker 12.

Here, the knob operations of the two variable resistors 5 and 6 are linked, and the variable resistor 6 is made of a good conductor from the starting point a to the middle point, and only the part from the middle point to the ending point C is made a resistor part.

FIG. 2 shows an example of the arrangement of three speakers 12, 13, and 14 attached to the small stereo reproduction device 15 and an example of a synthesized reproduction sound field.

Here, the sum signal (
L+R), difference signal from left horizontal speaker 13 (L-R)
, the reverse phase difference signal (R-L) is acoustically reproduced from the right sideways speaker 14, and the patterns formed by these sound fields are 2L and 2R shown by solid lines.

Therefore, at position a of the knob, a monaural sound field e is reproduced by only the speaker 12 as shown at a in Fig. 3, and as the knob is gradually turned from position a to position b, the difference signal ( L-R) and (R-L) are added in detail, resulting in a stereo sound field (solid line) that is enlarged and synthesized left and right as shown in FIG.

Further turning the knob from b to c will turn the left and right speakers 13
The difference signal from and 14 increases further, while the sum signal becomes zero.

In normal record performances, the singer's voice is often recorded so as to be located in the center, so it is known that the singer's voice disappears when the difference between the left and right signals is taken.

Therefore, the singer's voice cannot be heard from the speakers 13 and 14, and only the accompaniment sound is heard, while the voice from the microphone 8 is heard by the adding circuit 7.
Since the singer's voice is added to the microphone input singing voice signal f
will be exchanged.

In this way, by simply turning one knob in the directions a+b-+c, it is possible to gradually convert from mono to enlarged stereo to karaoke performance where singing voices can be exchanged.

Also, as shown in Figure 2, the center speaker was placed facing the front, and the left and right speakers were placed facing left and right, respectively.
The size can be made smaller than the conventional case in which all three speakers face the front.

In the above embodiment, the audio from the microphone 8 is directly added to the adder 7, but it is of course possible to divide the audio from the microphone 8 into input terminals 1 and 2 equally and add the same. be.

As described above, according to the present invention, conversion from mono to stereo, adjustment of stereo sound field expansion, cancellation control of solo vocals etc. in a stereo program, microphone audio input mixing, karaoke performance by exchanging singing voices, etc. The excellent effect of being able to adjust continuously can be obtained.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIGS. 2 and 3 are diagrams illustrating the operation of the present invention. In the figure, 3 and 7 are adder circuits, 4 is a subtraction circuit, and 5 and 6 are variable resistors.

Claims (1)

[Scope of utility model registration request] means for obtaining a sum signal and a difference signal of a stereo left signal and a right stereo signal; and a means for obtaining a sum signal and a difference signal of a stereo left signal and a right stereo signal; means for interlockingly varying the ratio; means for mixing another audio signal with the sum signal; and means for increasing the level of the other audio signal in conjunction with decreasing the sum signal level. A three-dimensional sound reproduction device characterized by the following.