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JPH02268100

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DESCRIPTION JPH02268100
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio device for outputting an audio signal. [Prior Art] Audio signals output from an audio device
such as an audio amplifier generally have lower audio signal components compared to mid-high
audio signal components for those who listen to the audio signals. I arrive late. In other words,
when listening to the audio signal with a speaker in which the middle and high band speaker and
the low band speaker are mounted on the same plane, the low band sound heard from the low
band speaker is greater than the middle and high band speaker It will be heard later than the
middle high-pitched sound you can hear. Therefore, in order to eliminate the above-mentioned
inconvenience, a speaker shown in FIG. 6 has been proposed conventionally. In the figure, the
low-range speaker (woofer) SP, the mid-range speaker (squaker) SP2, and the high-range speaker
SP, (tweeter) are respectively directed to the radiation direction (horizontal direction) of the
sound. The mounting position of the woo / S SP + is set to be forward of the mounting position of
the squawker SPz, and the mounting position of the squawker SP is set to be forward of the
tweeter SP3. According to the speaker having such a configuration, since the woofer SP is
installed closer to the listener than the squawker SPz or the tweeter SP3, the time delay of the
low-range audio signal component with respect to the mid-high range audio signal component is
Compensated, the listener can hear low and middle high tones at the same time without any time
difference. [Problems to be Solved by the Invention] According to such a conventional
configuration, the structure of the speaker becomes complicated, which is disadvantageous in
terms of vibration. In addition, because the cabinet that accommodates Uno \ SP and Skoka SPz
protrudes in front of the tweeter SP3 and Skoka SPz, the mid-high range sound radiated from the
Skoka SPz and the tweeter SP3 affects the effect of this projected cabinet There is a problem that
you receive it. Therefore, an object of the present invention is to provide an audio apparatus in
which middle and high frequencies and low frequencies can be heard at the same time without
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causing a time delay even when driving a general speaker. [Means for Solving the Problems] The
present invention has been made in view of the above-mentioned object, and comprises means
for delaying the audio signal component of the middle to high frequency relative to the audio
signal component of the low frequency. It is characterized by [Operation] In the above
configuration, the audio signal component in the middle to high frequency region is delayed with
respect to the audio signal component on the low frequency region by the delay means.
Accordingly, the low-range audio signal component is relatively advanced in time as compared to
the mid-high frequency audio signal component, and the sound of each band is emitted from the
speaker without time delay in frequency. Embodiments of the present invention will be described
below with reference to the drawings. In FIG. 1, 1 is a digital source device for outputting a
digital audio signal such as a compact disc player (CD player), 2 is an analog source device for
outputting an analog audio signal such as a tape recorder or a tuner, 3 is an analog source device
2 A / D converter for converting an analog signal into a digital signal, 4 is a function switch for
switching each output of the digital source device 1 and the A / D converter 4, 5 is a low-pass
compensation characteristic of the present invention A circuit 6 is a D / A converter for
converting the digital audio signal from the low band compensation circuit 5 into an analog
signal. In the above configuration, each audio signal from digital source device 1 or analog
source device 2 is selected by function switch 4, and when digital source device 1 is selected, the
digital audio signal is directly input to low band compensation circuit 5, When the analog source
device 2 is selected, the signal converted into the digital audio signal by the A / D converter 3 is
input to the low band compensation circuit 5. The low band compensation circuit 5 is constituted
by a digital filter, and as shown in FIG. 2, it sets characteristics of delay time of the audio signal
with respect to the frequency of the input digital audio signal. That is, the delay time of the
middle-high range audio signal component is set to be larger than the delay time of the lowrange audio signal component, whereby the low-range audio signal component becomes the
middle-high range audio signal component. We are trying to advance the time relatively. The
audio signal from the low band compensation circuit 5 is converted to an analog audio signal by
a D / A converter 6, power-amplified by a power amplifier (not shown), and then input to a
speaker to drive it. At this time, even if the analog audio signal is driven by a general speaker in
which speakers for each band such as a woofer and a tweeter are disposed on the same plane,
the above-mentioned (the low frequency compensation circuit 5 Since the audio signal
component of the band advances the time relative to the audio signal component of the middle to
high band, the delay of the low band to the middle to high band radiated from the speaker is
compensated. Therefore, the sound from the speaker arrives at the same time without causing
time lag in frequency to the listener.
Next, the low band compensation circuit 5 will be described. The transfer function of the all-pass
filter which passes all bands of the digital signal is S2-S + (ωr) '. Here, ω r is a resonant angular
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frequency (radian / second). Then, when this equation (1) is converted again, Therefore,
according to the equation (2), the all-pass filter has a configuration as shown in FIG. In the figure,
71 is a delay device, Ao, A +, Az, B0. Bz is a coefficient multiplier, 51 is an adder, 5 □ is a
subtractor, and its group delay characteristic is as shown in FIG. Therefore, compensation of the
above-described digital audio signal component in the low band can be performed by
appropriately setting the poles ωr and Q of the resonance frequency in the equation (1). Further,
if a plurality of all-pass filters in FIG. 3 are connected in cascade and ωr of each filter is set to be
different from each other, the entire frequency characteristic becomes as shown in FIG. 5 (a). As
shown in FIG. 5 (b), it is possible to obtain a characteristic (a characteristic similar to that in FIG.
2) in which the delay time is flat at the middle to high frequency and decreases as the frequency
decreases at the low frequency. The digital filter shown in FIG. 3 can be easily configured by
using a digital signal processor (DSP), and the delay time and frequency can be easily set to
desired values. In the above embodiment, the digital audio signal is low-pass compensated.
However, the analog signal may be directly low-pass compensated. [Effects] As described above,
according to the present invention, even in the case of driving a general speaker, the time delay
in the low band is compensated, so that the listener can make sound of the same time in
frequency from the speaker. I can hear it.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram
showing frequency vs. lead time and delay time characteristics of the low band compensation
circuit of FIG. 1, FIG. 3 is an example of the low band compensation circuit 4 shows the group
delay characteristics of the circuit of FIG. 3, FIGS. 5 (a) and 5 (b) show other group delay
characteristics of the low band compensation circuit, and FIG. It is a figure which shows the
conventional speaker which considered area | region compensation.
1 digital source device 2 analog source device 5 low frequency compensation circuit
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