JP3374400B2 - Multi-dimensional stereo signal reproduction device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-dimensional stereoscopic signal reproducing apparatus suitable for use in a vehicle-mounted 4-channel power amplifier circuit or the like.

[0002]

2. Description of the Related Art A conventional power amplifier circuit for a vehicle-mounted multi-dimensional stereoscopic signal reproducing apparatus is known, which is constructed as shown in FIG.

In FIG. 5, reference numeral 1 is a listening space, and a high-range (HIGH) and middle-range (MID) speaker L-HI placed on the left and right front of the listener 2 in this listening space.
GH and L-MID as well as R-HIGH and M-MID
When the left and right rear speakers L _WS and R _WS are arranged consisting woofer (WOOFER) or the like for bass backwards.

The right front and rear signals R _F and R _R supplied to the input terminals T ₁ and T ₂ are added to the right rear speaker R _WS ,
In addition, the left front-rear signals L _F and L _R are inverted and supplied to the left rear speaker L _WS and supplied to the input terminals T ₃ and T _4.
Are added and supplied in the same phase.

That is, the front-rear signals R _F and R _R are amplified by the buffer amplifiers 3A and 3B, the front-right signal R _{F and the} rear-right signal R _R are added by the adder circuit 4A, and are added via the variable resistor 5A. Inverting circuit 6A adjusted to a predetermined signal level
After being phase-inverted by, the inverted output is supplied to the input terminal of the speaker R _WS via the power amplifier 7A. In the right rear speaker R _WS , a voice coil or the like is wound in reverse, or the connection is reversed to output a positive phase output.

Similarly, the left front signal L _F and the left front signal L _R are amplified by the buffer amplifiers 3C and 3D, and the addition circuit 4B adds the left front signal L _F and the left rear signal L _R in the addition circuit 4B.
Via a variable resistor 5B via a power amplifier 7B after being adjusted to a predetermined signal level is supplied to the input terminal of the left rear speaker L _WS, it is directly sounded in positive phase.

[0007]

[SUMMARY OF THE INVENTION] With the conventional arrangement described above the left and right rear speakers L _WS, that the power amplifier 7A and 7B of people each for R _WS drives via a power supply circuit 8A, the left and right power amplifiers 7A and Since the input signals supplied to 7B are mutually inverted in phase as shown in FIGS. 6A and 6B, the load burden at the peak power of the power supply circuit 8A can be reduced to some extent by the canceling effect.

However, in this case, the left and right input signals emitted from the left and right rear speakers L _WS and R _WS are L ₁ = L _F + L _R and L ₂ = R _F + R _{R as} shown in FIGS. 6A and 6B. Since the signal levels L ₁ and L ₂ are not always the same and the left and right acoustic signals are different, the canceling effect is thin and the load on the power supply unit is greatly burdened even when the phases are inverted with each other in the normal stereo usage state. There was a problem that could not be improved.

The present invention has been made to solve the above-mentioned problems, and its purpose is to significantly reduce the load on the power supply circuit without changing the rated output of the power supply circuit. to provide a multiple stereoscopic signal reproducing apparatus capable of obtaining good Ri large power output.

[0010]

SUMMARY OF THE INVENTION The multi-dimensional stereo signal reconstruction of the present invention.
The live device comprises a first electroacoustic conversion means connected to a first electroacoustic conversion means.
A second means connected to the force amplifying means and the second electroacoustic converting means
Connected to the power amplification means and the third electroacoustic conversion means
Connected to the third power amplification means and the fourth electroacoustic conversion means
And a fourth power amplifying means, and the first or second power amplifier is provided.
One of the paths of the force amplifying means, and the third or fourth
Phase inversion means is installed in either path of the power amplification means.
And the input means of the first and second power amplification means.
The same signal is input to the input means of the third and fourth power amplification means.
One signal is input.

[0011]

According to the multi-dimensional stereoscopic reproduction apparatus of the present invention, between the first speaker to which the first signal is supplied and the second speaker to which the second signal identical to the first signal is supplied. Since either one of the phases is inverted, the load of the power supply circuit for driving the first and second speakers can be significantly reduced and the distortion caused by the voltage drop can be prevented. To be

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the multi-dimensional stereoscopic signal reproducing apparatus of the present invention will be described in detail below with reference to FIGS.

FIG. 1 shows a system diagram of the principle two-way system of this example. Although the same parts as those in FIG. 5 are designated by the same reference numerals and their duplicate description is omitted, the input terminals T ₁ and T _{2 are shown.} Are supplied with right front and right rear signals R _F and R _R , and input terminal T
Left front and left rear signals L _F and L _R are supplied to ₃ and T ₄ .

The right and left front signals supplied to the input terminals T ₁ and T ₃ are amplified by buffer amplifiers 3A and 3C, respectively, adjusted to a predetermined signal level by variable resistors 5C and 5E, and then inverted by an inverting circuit 6B and. The phase is inverted at 6C, and the inverted output signals are supplied to the power amplifiers 7C and 7E, respectively, and after power amplification, are supplied to the input terminals of the right front speaker R _FS and the left front speaker L _{FS as} the inverted power output. In these left and right front speakers L _FS and R _FS , the connection direction of each speaker is changed, the inverted output signal is inverted again, and the sound is emitted into the listening space 1.

On the other hand, the right and left signals supplied to the input terminals T ₂ and T ₄ are amplified by the buffer amplifiers 3B and 3D, respectively, adjusted to a predetermined signal level by the variable resistors 5D and 5F, and then the power amplifier 7D. And 7F,
Since the power is amplified and supplied to the right rear speaker R _RS and the left rear speaker L _RS in the normal phase state, the normal phase signal is supplied to the speaker normally connected to the input terminal of each speaker.

The power amplifiers 7C and 7D as well as 7E and 7F are driven by the power supply circuit 8B and 8C, respectively.

Therefore, the listener 2 in the listening space 1 can hear the 4-channel positive phase signal as an acoustic signal.
It is obvious that the inverting circuits 6B and 6C may be inserted in the speaker L _RS or R _RS system path on the left and right rear sides in the above configuration.

According to the above structure, the input terminal in the multi-dimensional stereoscopic signal reproducing device such as the on-vehicle 4- channel power amplifier
The right front and right rear signals R _{F of the} same signal are included in T ₁ and T _2.
And R _R are supplied to the input terminals T ₃ and T ₄ with the same signal.
The left front and left rear signals L _F and L _{R of the} signal are supplied.
Then, the input signal supplied from the power amplifier 7C to the right front speaker R _FS and the power amplifier 7 to the right rear speaker R _RS.
Input signal supplied from the D signal level and waveform are identical and the phase is opposite to each other, and the power amplifier 7F input signal and a left rear speaker L _RS supplied from the power amplifier 7E left front speaker L _FS the input signal is the signal level and waveform are identical supplied from, since the phase is <br/> opposite from each other, the output signal between the power amplifier 7C and 7D to the power amplifier 7E and 7F Manami FIG 2 a, the B As shown, at the same level L _3, they have the same waveform and opposite phases ,
Thus the reduction of the power supply voltage as shown in FIG. 2 C for each of the voltage drop in the power supply circuit 8B and the power supply circuit 8C is halved
Generation of waveform distortion 10 due is suppressed.

Therefore, as shown in the characteristic diagram of FIG. 3 in which the frequency thus obtained is plotted on the abscissa and the power output is plotted on the ordinate, the power-up in the low frequency range, particularly in the vicinity of 20 Hz, can be achieved. Very noticeable. That is, compared with the conventional characteristic of the characteristic curve 11 of FIG. 3, for example, a maximum of 40 W at 20 Hz and a distortion rate of 0.0
The value of 8% was increased to 45 W at 20 Hz and the distortion rate was 0.08% at 20 Hz by inserting the inverting circuits 6B and 6C as in this example, as shown in the characteristic curve 12.

FIG. 4 shows an actual system diagram of the vehicle-mounted multi-dimensional stereoscopic signal reproducing apparatus of the present invention. The figure shows only one channel. In FIG. 4, parts corresponding to those in FIGS. 1 and 5 are designated by the same reference numerals, and duplicate description will be omitted.

First, the left front signal L is applied to the input terminal T _3.
The left rear signal L _R (hereinafter referred to as the LR signal) is supplied to the input terminal T ₄ as _F (hereinafter referred to as the LF signal). Both of these signals are amplified by the buffer amplifiers 3C and 3D and then supplied to the adder circuit 4B (see FIG. 5) and the fixed contacts b and c of the 3-way and 2-way changeover switch SW ₁ .
Further, the LF signal is supplied to the variable resistor 5E, and the LR signal is supplied to the high pass filter 19. The output of the high pass filter 19 is connected to the line output terminal T ₅ .

LF signal and L added by the adder circuit 4B
The R signal is set to a predetermined level via the variable resistor 5B, and is supplied to the power amplifier 7B via the low-pass booster 16 constituting the equalizer circuit, the low-pass filter 17 → the switch SW ₃ → the phase inversion circuit 6A. Then, power amplification is performed and output to the output terminal T ₆ to which the speaker L _WS such as a woofer is connected. In this case, the power amplifier 7B is driven by the power supply circuit 8A, and in the in-vehicle multi-dimensional stereoscopic signal reproducing device or the like, the speaker L _WS of the subwoofer is the listener 2 as shown in FIG.
Place it behind.

3 way and 2 way switch SW
₁ is 3 way if the contact piece a is tilted to the fixed contact b side and LF
A signal is supplied, and if it is turned down to the fixed contact c side, it becomes a 2-way and an LR signal is supplied. The contact piece a side of the switch SW ₁ is connected to the variable resistor 5F and, after setting to a predetermined signal level, a high pass filter 1 which constitutes a channel divider.
The LF or LR signal supplied to the power amplifier 7F through the low-pass filter 15 is amplified in power and output to the output terminal T ₇ to which the speaker is connected.

In the output terminal T ₇ , the LF signal is emitted from the speaker for the mid range (MID) arranged in the left front of the listener 2 in the 3 ways, and in the 2 ways, as shown in FIG. 1, for example. In this way, the LR signal is emitted from the left rear speaker L _RS arranged on the left rear side of the listener 2.

Further, the LF signal is supplied to the power amplifier 7E via the variable resistor 5E, the switch SW ₂ , the inverting circuit 6C, and the high-pass filter 13 which constitutes a channel divider, and is distributed to the left front of the listener 2. High frequency (HIGH) or
The LF signal is inverted and supplied to the output terminal T ₈ to which the left front (FRONT) speaker L _FS is connected. The power amplifiers 7E and 7F are driven by one power supply circuit 8C.

In the case of operating as a three-way with the above-mentioned structure, when the contact piece a of the three-way and two-way changeover switch SW ₁ is manually switched to the fixed contact b side, the L- arranged in front left of the listener 2 level HIGH and mutually LF signal from the speaker for the L-MID phase with identical -LF and LF signal inverted is obtained from an output terminal T ₈ and T _7. Of course, in this case, the connection of the speaker for L-HIGH is reversed and the sound emission signal is emitted in the normal phase. in this case,
LF + LR from the subwoofer placed to the left rear of listener 2
The signal is emitted.

Similarly, by switching the contact piece a of the switch SW ₁ to the 2-way side and tilting it to the fixed contact c side, the power amplifier 7F
Is supplied with the LR signal. In this case, since the left rear speaker L _RS is arranged at the output terminal T ₇ as shown in FIG. 1, an LF signal is supplied to the speaker L _FS side and a signal of −LR = −LF is supplied to the speaker L _RS side. Will be done.

Even in this case, it is obvious that the deterioration of the distortion rate due to the voltage drop of the power supply circuit 8C can be prevented.

In the above embodiments, the case where the speakers are arranged in 2-2 and the case where they are arranged in 4-2 have been described, but it is clear that the present invention can be applied to various arrangements without being limited to these arrangements. Is.

[0030]

According to the present invention, it is possible to obtain a multi-dimensional stereoscopic signal reproducing device in which the voltage drop of the power supply circuit in the low frequency band is reduced and the rated output of the power amplifier is increased.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a multi-dimensional stereoscopic signal reproducing device of the present invention.

FIG. 2 is a waveform explanatory diagram of the present invention.

FIG. 3 is a frequency-power output characteristic diagram for explaining the present invention.

FIG. 4 is a block diagram showing another embodiment of the multi-dimensional stereoscopic signal reproducing device of the present invention.

FIG. 5 is a configuration diagram of a conventional multi-dimensional stereoscopic signal reproducing device.

FIG. 6 is a conventional left / right signal waveform diagram for cancellation.

[Explanation of symbols]

1 listening space 2 listeners L _FS , R _FS , L _RS , R _RS speakers 6C, 6B inverting circuit

Claims (3)

(57) [Claims] 1. A plurality of channels of power amplification means and electricity
In a multi-dimensional stereoscopic signal reproducing device using an acoustic converting means, a first power amplifying device connected to the first electroacoustic converting means.
A second power boost connected to the stage and the second electroacoustic transducing means.
A width means and a third power amplification means connected to the third electroacoustic conversion means.
A fourth power boost connected to the stage and the fourth electroacoustic transducing means.
Width means, and either one of the first or second power amplification means
None of the system path and the third or fourth power amplification means
Phase inversion means is provided in one of the paths, and is the same as the input means of the first and second power amplification means.
The signal to the input means of the third and fourth power amplifying means.
Signal input, which is characterized in that
Raw equipment. 2. The first and the second aspects according to claim 1.
The same power source is used for the power amplifying means of No. 2, and
The power supplies supplied to the third and fourth power amplification means are the same.
A multi-dimensional stereoscopic signal reproducing device characterized by being used as a power source. 3. The method according to claim 1 or 2, wherein:
The first and third power amplifying means are the first and third front left and right.
Connected to the electro-acoustic conversion means of
The force amplifying means is the second and fourth electroacoustic transducers for left and right rear.
Multi-dimensional stereoscopic signal reproducing device characterized by being connected to means
Place