JPH0323753Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] The present invention is designed to provide a highly realistic listening experience that is almost the same as the original sound heard in a large space such as a concert hall. The present invention relates to a reproduction device for reproducing sound, and more particularly to a mounting structure for a speaker of the reproduction device.

[Background of the idea]

Comparing the hearing sensation and the physical quantities related to it, we find that: Sense of presence/spreadness → lateral component Richness of sound/loudness → initial reflected energy Frontal localization/balance → front-to-back ratio Clarity → intelligibility of sound Resonance → Reverberation time Brightness of sound → High range/Mid range Low pitch → Low range/Medium range These physical quantities are effective in evaluating the psychological acoustic hearing sensation at a specific listening position. It covers all of the transient characteristics, steady-state characteristics, and directivity of the sound field under the conditions of a fixed location.

In recent years, a wide variety of methods have been considered, called surround, in an attempt to create an aurally rich sense of presence.

The main method is to create a feeling of being surrounded by sound. This method places speakers not only in front of the listener, but also above and behind the listener.

Specifically, the acoustic signal to be supplied to one or more upper and rear speakers may be a signal in which the left and right sounds from the front are delayed, for example, or a signal obtained by delaying the left and right sounds from the front, or a signal obtained by delaying the left and right sounds from the front, or by delaying the left and right sounds from the front, taking the above physical quantities into consideration. It is used as a signal, etc., and is further reproduced as a signal that is a combination of the above-mentioned physical quantities.

Therefore, in order to obtain a favorable acoustic listening sensation, it is necessary to set the positional relationship between the listener's head and each of the above-mentioned speakers correctly. It was installed by being attached to a table or stand placed in the room.

However, if a listener wishes to listen in a slightly different location, the listener is forced to perform the troublesome task of changing the placement of each speaker each time, making it impossible to easily change the listening location.

[Purpose of invention]

The purpose of the present invention is to provide a sound reproduction device that surrounds the listener with a three-dimensionally considered sound field and allows the speaker of the sound reproduction device that reproduces the sound field to be easily set at the position desired by the listener. The goal is to provide the following.

[Structure of the idea]

For this purpose, the sound reproduction device of the present invention includes left and right speakers installed on both sides of a listening position, and audio signals installed approximately above or above and behind the listening position and at least delaying the audio signals supplied to the left and right speakers. A sound reproduction device comprising an upper speaker for reproducing a signal, wherein the upper speaker is attached to a backrest of a chair so as to face downwardly or downwardly forward, and the upper speaker is mounted on an armrest of the chair so as to rotate in a vertical direction. The left and right speakers are attached to a pivoting piece, and the upper speaker can be adjusted in direction with respect to the listener sitting on the chair, and the left and right speakers are moved back and forth near the left and right sides of the listener's head. made possible.

〔Example〕

Examples of the present invention will be described below. Third
The figure shows the sound reproduction circuit. 1,1'
are input terminals into which the R channel audio signal and L channel audio signal are input, 2, 2' are buffers, 3,
3' is a delay circuit whose delay time can be adjusted by control pulses applied to control terminals 3a, 3a'.

Further, 4 and 4' are echo circuits, and one echo circuit 4 includes mixers 41 and 42 and a delay circuit 4.
3. Consisting of gain adjustment circuits 44 and 45 that keep the output level below the input level, the output signal from the delay circuit 3 and the signal from the gain adjustment circuit 45 are mixed into the mixer 4.
2, the output is delayed by a delay circuit 43, the level of the output is adjusted by a gain adjustment circuit 44, and the output is mixed (added) with the output signal of the delay circuit 3 by a mixer 41 and output. A part of the output of the gain adjustment circuit 44 is input to a gain adjustment circuit 45 and is repeatedly mixed with the first signal by a mixer 42.

Therefore, the gains of the gain adjustment circuits 44, 45 are adjusted by the control signals applied to the terminals 44a, 45a, and the delay time of the delay circuit 43 is adjusted by the control signals applied to the terminals 44a, 45a.
A desired reverberation can be added by adjusting the pulses applied to the signal. This reverberation time interval is preferably about 100 ms to several ms, for example. Since the other echo circuit 4' has a similar configuration, the same reference numerals are given the same symbols as 〓'〓. Note that the terminal 43 of the delay circuits 43, 43'
If the control pulses to a and 43a' are stopped, the sound will be delayed by the delay circuits 3 and 3' without reverberation.

5 is a sound quality adjustment circuit that inputs the output signals from the echo circuits 4 and 4' and adjusts the frequency characteristics;
For example, it is adjusted to cut out components above 10kHz. Note that the sound quality may be adjusted by a control signal to the terminal 5a by changing the cut component or making it uncut, depending on the sound preference. Reference numeral 6 denotes an addition/subtraction circuit that subtracts and adds the two input signals output from the sound quality adjustment circuit 5 at an appropriate ratio, or outputs them as L and R signals as they are, and is switched by a control signal from the terminal 6a.

7 is a (L-R) subtraction circuit that subtracts the output signals from the echo circuits 4 and 4'; 8 is a low-pass filter that extracts components below 7 KHz from the output signal from the subtraction circuit 7; and 9 is a noise removal circuit. .

VR1 to VR5 are linked variable resistors for volume adjustment, VR1 is for side L speaker 10,
VR2 is for the side R speaker 10', VR3 is for the surround center speaker 12, VR4 is for the surround L speaker 13, and VR5 is for the surround R speaker 14 (see FIG. 2).

Note that the delay circuits 3, 3', 43, 4 described above
Regarding 3', this can be configured with a BBD (bucket brigade device), but
It is also possible to use a CCD (charge coupled device). However, when using this CCD, for example, the input signal after buffers 2 and 2' is modulated at high frequency and delayed by the CCD, and then the low frequency components are It is necessary to demodulate it.

FIG. 1 is a perspective view of this embodiment. In the figure, reference numeral 20 denotes a chair, and on this chair 20, a device 21 comprising the above-mentioned circuit component is attached to the right arm rest 20a, and a speaker holder 22 made of a pipe is attached to the left and right sides of the backrest 20b. is attached at both ends with fixtures 23, 23'.

A surround center speaker 12 and an L speaker 1 are placed on the upper part of the mounting brackets 23 and 23'.
A cabinet 24 in which speakers 3 and R 14 are loaded so that their sound emission direction is downward is rotatably mounted in the direction of arrow A. Further, the speaker holder 22 is also movable in the direction of arrow B, that is, in the vertical direction.

More specifically, the cabinet 24 is located in a zone approximately above and behind the ears of the listener sitting on the chair 20, and
The sound emitting devices 2 to 14 are installed so that the sounds are directed toward the listener from above the listener's head or from above and behind the listener.

Reference numerals 25 and 25' denote rotating pieces that are pivotally attached to the elbow rest 20a and are attached to be rotatable in the vertical direction, and side speakers 10 and 10' are mounted at the tips of each of the rotating pieces.
It is attached so that it can rotate in the directions of arrows C and C'.

The side speakers 10, 10' are housed in cases 26, 26' that surround the front surfaces of the side speakers 10, 10' in the form of eaves.

Now, the audio signals of the R and L channels applied to the input terminals 1 and 1' are directly connected to the variable resistor VR1.
Input to VR2, side speakers 10, 10'
, and conventional stereo reproduction is performed.

Furthermore, the audio signals input to the delay circuits 3, 3' are delayed there, and then input to the echo circuits 4, 4'. At this time, it is also possible to make the delay times of the delay circuits 3 and 3' different.

In the echo circuit 4, the first arriving sound signal passes through a mixer 42, a delay circuit 43, and a gain adjustment circuit 44, and is mixed at the mixer 41 with the sound signal after the delay time set in the delay circuit 43 has elapsed. The first echo of the sound signal is an echo that has been attenuated only by the gain adjustment circuit 44 compared to the original. The second echo uses another gain adjustment circuit 4
5 and then reaches the mixer 41 via the mixer 42, delay circuit 43, and gain adjustment circuit 44, so that it is further delayed and greatly attenuated compared to the first signal. The third and fourth shots will have a greater delay and attenuation. Since this action is performed in a complicated manner, it becomes possible to add a desired echo. By appropriately setting the delay time of the delay circuit 43 and the gain settings of the gain adjustment circuits 44 and 45, it becomes possible to realize reverberant sound that matches the actual hall. The above also applies to the other echo circuit 4'.

Note that the echo circuits 4 and 4' may be circuits that delay only once. In this case, circuits 42, 45
may be omitted, or the output of the circuit 45 may be set to approximately zero by a control signal to the control terminal 45a.
Furthermore, if an echo is not required, the gain of the circuit 44 may be set to zero by a control signal to the control terminal 44a of the circuit 44. It is necessary to perform these operations similarly for the other echo circuit 4'.

The circuits from the subtraction circuit 7 to the noise removal circuit 9 process the LR signals. here,
The in-phase components of the L channel component and the R channel component of the output signals from the echo circuits 4 and 4' are canceled out, and in an actual hall, the high-frequency component of the echoes from the walls etc. is greatly attenuated. A low-pass filter 8 cuts off high-frequency components, and a noise removal circuit 9 removes the noise components, and the components are reproduced from a surround center speaker 12. Therefore, a complex reverberant sound is reproduced from the center speaker 12, and this is a pseudo sound that is a reverberant sound that is a multipath mix of a plurality of sounds reflected from the back and upper walls of a hall or the like.

The sound quality adjustment circuit 5 attenuates the high-frequency components of the output signals from the echo circuits 4 and 4', for example, cuts the components above 10 KHz, or the components above other frequencies, or sends them to the adder/subtractor circuit 6 without cutting them at all. Send. The two outputs of this addition/subtraction circuit 6 have αL−
Signals such as βR and αR−βL are obtained by subtracting appropriate amounts of the signal components of both channels. α and β are coefficients, and α≦1 and β≦1. Therefore, α=1,
When β = 0, the L and R signal components are obtained by separating, and when α = 0 and β = 1, the signal components with reversed channels such as -L and -R are obtained by separating. It will be done.

By the above-mentioned surround side speakers 12 to 14, L channel sound and R channel sound from the side are reflected in the hall and converted into indirect sound that has undergone various transformations in phase, time, level, path, and frequency. Played as a simulated voice.

And the surround speakers 12 to 14 are
Since its installation position is above or above and behind the headrest 20c, the direction of sound emitted from the side speakers 10, 10' and the direction of sound emitted from the surround speakers 12 to 14 are different. , intersect at or near the headrest 20c so as to be substantially perpendicular to each other. Therefore, for the listener who is sitting on the chair 20 and resting his head on the headrest 20c,
A three-dimensional sound field is formed in the head, and the sound field becomes a natural-sounding reproduction sound field similar to the original sound field generated in a concert hall or the like, resulting in an extremely good surround effect.

The reproduction sound field can be moved to any desired location by moving the chair 20.

[Effect of idea]

From the above, the present invention has the feature that it is possible to generate a natural-sounding sound field that is extremely similar to the original sound field in a concert hall, etc., in a personal zone near the ear without causing confusion for others. It becomes possible to easily set the sound field to a position desired by the listener.

[Brief explanation of drawings]

FIG. 1 is a perspective view of this embodiment, FIG. 2 is a sectional view of a side speaker, and FIG. 3 is a circuit diagram of the sound reproduction device of this embodiment. 1, 1'...Input terminal, 2, 2'...Buffer,
3, 3'... delay circuit, 4, 4'... echo circuit,
5... Sound quality adjustment circuit, 6... Addition/subtraction circuit, 8...
Low-pass filter, 9...Noise removal circuit, 1
0,10'...Side speaker, 12~14...
Surround speaker, 20...Chair, 22...
Speaker holder, 25, 25'... Rotating piece.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Left and right speakers installed on both sides of the listening position, and audio signals installed approximately above or above and behind the listening position and at least delaying the audio signals supplied to the left and right speakers. and an upper speaker for reproducing an audio signal, the upper speaker is attached to the backrest of the chair so as to face downwardly or downwardly forward, and the upper speaker is rotated in a vertical direction on the armrest of the chair. The left and right speakers are attached to rotatable pieces that are pivoted in such a manner that the upper speaker can be adjusted in direction with respect to the listener sitting on the chair, and the left and right speakers are moved back and forth around the right and left sides of the listener's head. A sound reproduction device characterized in that it is movable. (2) The sound reproducing device according to claim 1, wherein the rotating piece is a substantially U-shaped pipe. (3) The utility model registration claim 1 or 2 is characterized in that the left and right speakers are housed in a case that surrounds the front periphery of the speaker in an eaves-like manner, thereby suppressing the spread of the emitted sound. The sound reproduction device according to item 2.