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JPH02250598

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DESCRIPTION JPH02250598
[0001]
[Industrial use distribution] The present invention relates to a sound reproduction apparatus
using a plurality of speakers. [Prior Art] In an audio reproduction apparatus used in a large-scale
indoor acoustic space such as a hall or a large listening room, a plurality of speakers are usually
provided and the same signal is input to each speaker A method is used to obtain the required
sound pressure. By the way, as is well known, the load acoustic impedance of the sound field
changes depending on the size and the arrangement position of the indoor space where the
speakers are deployed, so even if it is an inter-manual signal, the size and the arrangement
position of these indoor spaces If the conditions are different, the amplitude of the diaphragm of
the speaker will fluctuate, but especially in the case of using multiple speakers, it is necessary to
correct this amplitude fluctuation. For this reason, conventionally, as shown in FIG. 3, for
example, each speaker (12s) = (12n), power amplifier (13+) ? ? (13n) and gain of a speaker
group installed at ? и corner (II) in the room Power amplification 7m (13+) to (13n) on the
output side of the gain adjustment 'a (14) to (14n) having the adjustment' a (14t) to (14n) and
connected to the input terminal (15) , And the output sides of the power amplifiers (13+) to (13n)
are respectively connected to the speakers (121) to (12n) to constitute a plurality of output units
(IGn) to (16n), The acoustic signal input to the input terminal (15) is amplified by the power
amplifiers (13m) to (13n) through the gain adjusters (14m) to (14n) of the output units (let) to
(1Bn), respectively. Corresponding speed The size of the human power signal of each of the
power amplifiers (13+) to (13n) in each of the output units (IGm) to (18n) is adjusted by the gain
adjusters (14+) to ( By adjusting by 14n), the amplitude fluctuation of the diaphragm of the
speakers (12+) to (12n) as described above is corrected for each of the speakers (12i) to (12n).
[Problems to be Solved by the Invention] However, in the conventional configuration as described
above, when adjusting the gain adjusters (14+) to (14n) of the output units (1B +) to (IGn),
microphones, amplitude detectors, etc. are adjusted. In addition to the need for a measuring
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instrument, when the number of speakers is large, there is a problem that the adjustment takes a
long time. The present invention has been made to solve the above-mentioned problems, and the
correction of the acoustic load fluctuation of each speaker due to the sound field condition in
which the speakers are arranged, without using a separate measuring instrument, It is an object
of the present invention to provide a sound reproduction device that can be performed in a short
time.
[Means for Solving the Problems] In order to achieve the above object, according to the sound
reproducing apparatus of the present invention, the output side of a gain regulator is connected
to one fixed contact of a switch via a power amplifier, Connected to the other fixed contact of the
switch in each output unit, the input side of the voltage amplifier is connected, and the output
side of this voltage amplifier is level detected Connected to the gain calculator via the converter,
and further, the gain calculator is connected to the input side of the gain regulator in each of the
output units, and the switch control circuit is connected to the input side of the gain calculator.
And the output of this switch control circuit connects the speakers of each output unit except for
one output unit to the output of the power amplifier, The switches are controlled so that a
speaker is connected to the input side of the voltage amplifier, and the output of the voltage
amplifier is detected by the level detector, and the output of the gain calculator to which the
detected output is input To control the gain regulator of one of the output units, and to perform
control of the switch by the switch control circuit and control of the gain regulator for all of the
output units. It is said that. Further, the gain adjuster may be constituted by a digital signalcontrolled multiplying D / A converter, the level detector may be constituted by an A / D
converter, and the gain calculator may be constituted by a digital divider. Furthermore, it is
preferable that the gain calculator can be controlled so that the electromotive voltage level in the
speaker of the output unit in a state of not being connected to the power amplifier is constant for
all the speakers of each output unit. [Operation] the present invention "-by the acid, the acoustic
load fluctuation of each speaker level detection of the reaction of the sound field driven by the
speakers of all other output units except the speaker of one output unit Detects the voltage level
of the electromotive force in the speakers of one of the output units, calculates the detected value
with a gain calculator, and adjusts each gain so that each speaker of each output unit has a
constant amplitude By adjusting the device, it is possible to correct the variation of each speaker
in a short time without another measuring device. Embodiments of the present invention will be
described in detail with reference to FIGS. 1 and 2. FIG. 1 shows the circuit configuration of the
sound reproduction apparatus according to this embodiment, in which (1+) to (In) are output
units, and these output units (11) to (1n) connects the output side of the gain adjusters (2I) to
(2n) to one of the fixed contacts of the switches (41) to (4n) through the power amplifiers (31) to
(3n), Speakers (51) to (5n) are connected to movable contacts of the switches (4I) to (4n), and the
switches (41) to (41n) in each of the output units (11) to (1n) The input side of the voltage
amplifier (6) is connected to the other fixed contact of 4n).
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The output of the voltage amplifier (6) is connected to the gain calculator (8) via a level detector
(7). Further, the gain calculator (8) is connected at the output side to the input side of the gain
adjustment 1 (21) to (2n) in each of the output units (It) to (1n), and the input side is at each of
the output units (11) It is connected to a switch control circuit (8) which controls switches (4 ?)
to (4) of (in). (LO) is an input terminal connected to the input side of the gain adjuster (2 to 2n) of
each of the output units (1, 1) to (In). Now, the switch control circuit (9) removes the switch (41)
of one output unit ((1+ in the illustrated state)) (switching of all the other output units (12) to (In)
( 42) to (4n) are controlled so that the speakers (52) to (5n) and the output sides of the power
amplifiers (32) to (3n) are connected, and only the speaker (51) of the 77 unit lt) is a voltage
amplifier In the state controlled to be connected to the input side of (6), the electromotive force
voltage of the speaker (51) is amplified by the voltage amplifier (8) and level detection? It is
input to ji (7). The detection output of this level detector (7) is input to the gain calculator (8) as
V (J) dB, for example. The gain calculator (8) receives the switch selection signal from the switch
control circuit (9), and the gain equivalent to the deviation (VREF-V (1)) dB from the reference
level VREFdB is added to the gain adjustment II (2+). Set The above operation is controlled by the
switch control circuit (9) to control the second (k: 1 to n) switching W (4k) and the gain
calculator (8) to the reference level V by the gain regulator (2k). Deviation from dB (V) IEF-V (k))
dB ? It can be set automatically in sequence. The acoustic load of the speakers (51) to (5n) of
each of the output units (1+) to (n) is corrected in the following process by such an operation.
FIG. 2 shows an equivalent circuit of the mechanical-electrical conversion in the loudspeaker (5k)
of the above-mentioned one output unit (lk). In the figure, the relationship between the
electromotive force voltage level Eo of the speaker (5k) in the sound field and the load
impedance 2 for the speaker (5k) is Eo = AV (A: Force factor, v: diaphragm speed). On the other
hand, as apparent from the mechanical equivalent circuit, ps = zv <p: = pressure, S: diaphragm
area, Z: load impedance).
Therefore, it becomes Z: PS / V: APS / Eo, and the electromotive force voltage level Eo of the
speaker (5k) is inversely proportional to the load impedance Z. Therefore, the electromotive force
voltage level Eo is measured relatively large for the speaker with small load impedance Z, that is,
the speaker installed under the condition that the diaphragm easily moves, and conversely, the
diaphragm is installed under the condition that it is difficult to move In the case of a speaker
having a large load impedance Z, the electromotive force voltage level Eo will be measured
relatively small, so when using these results to control the amplitude and speed of each speaker
at the time of driving constant, Depending on the load impedance value, the input power is
reduced when the impedance value is small, and conversely, the input power is increased when
the impedance is large, so that the input power is inversely proportional to the measured
electromotive force voltage level Eo. You can adjust it. Assuming that the level detector (7) has a
logarithmic conversion characteristic to perform such adjustment, the gain calculator (8)
subtracts the detection voltage from the reference voltage VR [: F to obtain a gain adjustment
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3
output. To get Further, the gain adjustments TA (2+) to (2n) can be controlled by having a
characteristic that the gain logarithmically changes with respect to the control input. In the
present invention, in addition to the above embodiments, the level detector (7) comprises an A /
D converter to convert the output of the voltage amplifier (6) into a digital signal, and the gain
calculator (8) comprises It consists of a digital divider that divides the trial data by the input
digital signal, and gain adjustment to history? A (2+) to (2n) can realize the same control as that
of the above embodiment even if they are constituted by a multiplying D / A converter in which
the division output of the gain calculator (8) is digital power. As described above, according to
the sound reproducing apparatus of the present invention, the sound load fluctuation of each
speaker is generated by the sound field driven by the speakers of all the other output units
except the speaker of one output unit. Is detected by the level detector as the voltage level of the
electromotive force in the speakers of one of the output units, the detected value is calculated by
the gain calculator, and the speakers of each output unit have a constant amplitude. So that each
gain regulator can be adjusted. Therefore, it is not necessary to use a separate measuring device
(Amplitude and velocity fluctuations of the diaphragm due to changes in the load acoustic
impedance of the speakers of each output unit can be automatically controlled in a short time by
controlling the human power of each speaker It has an excellent effect that it can be done.
[0002]
Brief description of the drawings
[0003]
1 and 2 show an embodiment of the present invention, and FIG. 1 is a block circuit diagram of an
acoustic reproducing apparatus according to this embodiment, and FIG. 2 is an equivalent circuit
diagram of mechanical and electrical conversion of a speaker. is there.
FIG. 3 is a block circuit diagram of a conventional example. (1+) to (In) ... output unit, (2i) to (2n)
... gain adjuster, (31) to (3n) ... power amplifier, (4t) to (4n) ... Switching KL (51) to (5n) иии
Speakers (6)-и и и Voltage amplifier, (7) и и и Level detector, (8) и и и Gain calculator, (9) и и и Switching
Control circuit. Fig. 7 2y to 2n; gain 111! ! 37 to 3n; power increase 41 to 4 /? (Cursor 51-57:
Speaker 8 two-gain computer 9: switcher ship control circuit
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