JPS5463817

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DESCRIPTION JPS5463817
Description 1. Title of the Invention Multi-way speaker device (1) A multi-way speaker device
having a plurality of speakers, which is responsive to a single sine wave pulse that is delayed
near the crossover frequency and synchronized with this response waveform A multicharacteristic characterized in that the characteristic of the speaker itself and / or the
characteristic of the network and / or the positional relationship between the speakers in the
front-rear direction is adjusted so as to minimize the difference signal output from the single
sinusoidal pulse delayed. Way speaker device.
乙 Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-way
speaker device, and in particular, by improving the degree of faithful waveform measured
quantitatively by an input / output waveform comparison device, in particular, the time
difference distortion and the transient characteristics between speakers, etc. It is an attempt to
improve the characteristics of the foreword. Heretofore, in the case of a multi-way speaker box,
as the acoustic characteristics of a speaker and a speaker system, there are many that take into
consideration the response characteristics to a continuous waveform of a single frequency as
represented by frequency sound pressure characteristics. Besides the characteristics, the sound
quality as a system is considerably affected by the network configuration method and the
speaker arrangement. In particular, the connection of sounds near the crossover becomes a
problem. With regard to the characteristics near this crossover as well, there are many in which
the characteristics of the loudspeakers and the network are adjusted so that only the sound
pressure frequency characteristics become flat, that is, only the response characteristics for
single-frequency continuous waveforms. So, the response characteristics to the transient
waveform are less important and nine. In addition, the means for quantifying and evaluating
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transient characteristics has not been suitable. In the present invention, transient characteristics
are quantified by the input / output waveform comparison device as described below, and the
characteristics of the speaker itself and / or the network and / or the speed / force device are
adjusted to improve the quantified transient characteristics. A speaker device is proposed.
Natural sounds are more likely to be occupied by transient waveforms consisting of multiple
EndPage: 1 metal scrap wave numbers than continuous waveforms of a single frequency. In the
present invention, a single sinusoidal pulse is used as this transient complex sound. The
waveform of this single sinusoidal pulse is shown in FIG. 1al. Natural sounds are considered to be
rich in the repetition of several 隼 -sine wave pulses.
乙 Claims
The present invention will be described in detail below. Fig. 1 shows the response waveform
when a single sine wave pulse waveform of crossover frequency is applied as an input signal. (A)
is the input signal, I is the low band side speaker, lcl is the high band side speaker It is a response
waveform, and shows the response waveform measured by the microphone in the case where
both the low band side and high band side speakers are attached to the same plane baffle plate.
(The rising time of the 11 input waveforms is t == Q, and the rising times of (b) and lcl are tl and
t2. The times t1 and t2 correspond to the propagation time of the sound from the sound source
position of the speaker to the microphone, respectively. The time difference between tl and t2 is
due to the difference between the sound source positions of the low band and high band
speakers. It can be seen that the response waveform when moving in the above case and
combining the low band side speaker and the high band side speaker is 1 (1 1 1 111, and this
response waveform ++ 11 is quite different from the input signal (al. In order to quantify the
interval between waveform reproduction of this table 弗 −-祷祷 □ 巳巳巳・出力出力波形.
The specific example of the input and output waveform comparison device is! As shown in FIG. In
the figure, (1) is a signal generator which generates a single sinusoidal pulse signal as shown in
FIG. This signal is amplified by the amplifier (2) and then applied to the measured speaker (3). (4)
is a microphone which receives the sound wave from the speaker to be measured (3) and
converts it into an electric signal, and the output of the Seikuro 7 on (4) is amplified by the
amplifier (5). (6) is a delay circuit, which delays a signal by time to the transmission of sound
between the speaker and the microphone, and the delay time can be varied. (7) is a differential
operation unit that calculates the difference between the waveform delayed by the delay circuit
(6) and the microphone output amplified by the amplifier (5). That is, the input waveform and the
output waveform of the speaker synchronized in time are applied to the differential operation
unit (7) for calculation. (8) is a device for displaying a difference signal of the input and output
waveforms outputted from the differential operation unit (7), for example, one capable of
displaying a size such as a voltmeter, one capable of displaying the waveform itself What can
perform frequency analysis like a real time spectrum analyzer etc. can be used. When comparing
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the input and output waveforms of a speaker system consisting of two speakers on the low band
side and the-band side, a single sinusoidal pulse signal output from the signal generator (1) is
applied to both speakers Of course.
Thus, the degree of waveform reproduction can be quantified by using the above-mentioned
input / output waveform device. That is, if a composite response wave signal is applied to one of
the differential operation units (7) and a delayed input signal delayed by the delay circuit (6) so
as to be temporally synchronized with this signal is applied to the other, The degree of waveform
reproduction can be quantitatively grasped as a difference signal of the two signals outputted
from the differential operation unit (7). The smaller the difference signal, the more faithful the
waveform is reproduced. The waveform of FIG. 1f shows a difference signal between the
waveform 1 (11 and the delayed input signal delayed so as to be synchronized with this
waveform. The delay time of this delayed input signal is determined by operating the delay
circuit (6) so that the difference signal 1 fl is minimized. Thus, the difference signal 1fl indicates
the degree of waveform reproduction when two layers of speakers are mounted on the same
baffle plate, and it can be seen that the faithful reproduction is not achieved. It is considered that
this is mainly due to the time difference between tl and t2, that is, the difference between the
sound source positions of the low band speaker and the high band speaker. Therefore, the
difference signal is measured by moving the positions of the two speakers in the longitudinal
direction. Then, the speaker position where the difference signal is minimum is the speaker
device where the most faithful reproduction is achieved. FIG. 1al is a diagram showing such a
minimum difference signal, and the synthesized response waveform signal at this time is as
shown in FIG. 1hl. It can be seen that the waveform of FIG. 1h1 is much closer to the input signal
waveform 1a) than the waveform shown in FIG. 1 + 11. In order to minimize the difference signal
output, in addition to adjusting the position between the speakers in the back and forth direction
EndPage: 2 direction, the characteristics of the speaker itself and / or the characteristics of the
network may be adjusted. In reality, it is preferable to consider the characteristics of the network
in consideration of the features (the use frequency band) of the speakers to be used, and to
adjust the positional relationship in the front-rear direction of the speakers. By the abovedescribed operation, it is possible to improve the sound connection in the crossover frequency
band which has been the most problematic in the conventional sound quality. Further, according
to the present invention, to evaluate the degree of faithfulness of waveform reproduction directly
from the difference signal output of the input / output waveform of the 4-1com speaker
influences the degree of waveform reproduction such as frequency characteristics, phase
characteristics and transient characteristics. All sound quality characteristics are evaluated at one
time and comprehensively. Therefore, the multi-way speaker device according to the present
invention comprehensively determines the back pressure characteristics / transient
characteristics in the crossover frequency band and uses the transient composite sound to realize
better fidelity waveform reproduction, and further, between the speakers. Since the time
difference distortion can be minimized, the sound quality can be improved.
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Although the above description is for the case of using the high band speaker and the low band
speaker, the high band speaker and the Nakashiro speaker when the high band speaker, the mid
band speaker and the low band speaker are used The adjustment described above may be made
for the interval and between the midrange speaker and the low range speaker.
4, Brief description of the drawings Figure 1 is a signal waveform diagram,! J2 is a speaker input
/ output waveform comparator. (1) is a signal generator, (3) is a speaker, (4) is a micro j-phone,
(6) is a delay circuit, (7) is a differential operation unit, and (8) is a display device. Patent
Applicant Sanyo Electric Co., Ltd. Representative Ige Tei No. 1 II 2nd EndPage: ３
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