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JPS5458403

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DESCRIPTION JPS5458403
1 ░ 'BA Letter 1, Title of the Invention
Sound image enlargement sound device
3. Detailed Description of the Invention The present invention relates to a sound image enlarging
acoustic device, and more specifically, an atmosphere in which a sound image is enlarged threedimensionally to a listener by a monaural sound signal by two speakers facing a fixed interval.
FIG. 1 shows an embodiment of a sound image enlarging acoustic device according to the present
invention, which relates to a sound image enlarging acoustic device which provides In FIG. 1, the
audio signal from the audio signal source 1 is transmitted to the transistor Tr1 through the
switch 2. The network formed by the o transistor transistor rr1 resistor r1g K2 capacitors C1 and
C2 is rl, r2. EndPage: 1 which constitutes a low-pass filter with a cutoff frequency fC determined
by the values of cl and c2. A monaural signal whose frequency is discriminated by the low-pass
filter is applied with a bias voltage of a constant potential by a variable resistor r3 to a resistor r4
capacitor c3 and is delayed by a delay element 3 for a predetermined time. In the configuration
of FIG. 1, a BBI) element is used for the delay element 3. As is well known, this BBD element
adopts a P-channel recongate process, and a unit circuit per stage is constituted by a four-pole
MOS transistor consisting of one capacitor and two transistors, and an input signal is generated
by a clock signal. Is transferred. In FIG. 1, the input signal of the delay element 3 is transferred
by the clock signal from the clock signal generator 4 and delayed for transfer. The circuit 3 or 4
composed of the resistor rr capacitor C3 aims to give an optimum bias to the delay element 3.
The above-mentioned low-pass filter composed of the transistor Tr1 etc. is a monaural signal and
the delay element 3 to prevent the generation of the beat frequency signal with the clock signal
given to the wave number f. Is determined by the clock frequency from the clock signal source 4.
The transistor T and the resistor r5ere capacitor C4 "52 constitute a similar low pass filter. The
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purpose is to remove the clock signal included in the signal delayed by the delay element 3 and
obtain only the audio signal. This audio signal is amplified by an amplifier circuit composed of a
transistor Tr3 and is applied to a phase shift circuit composed of a transistor Tr4 and a resistor rrHrB capacitor C6. r and resistance r9. I am in the mad 314 linox circuit composed of r10tr11.
Here, the characteristics of the above-described delay circuit will be described in detail. FIG. 2 is
the frequency characteristic of the delayed signal. Here, the frequency of the clock signal of the
delay element 3 is 16,. The case where the number of stages of 75 KH2 and delay elements 3 is
128 will be described.
Well known (the delay time tp of the j3 BD delay element is the clock frequency f. It is
determined by p and the number of stages ND and there is the following relationship. Device tp =
ND / 2 fop so f. In the case of p = 15.75 KH2 and ND2 128, the delay time tp ? 4 mB @ C. Also,
the frequency characteristic has a relationship of f characteristic (?s dB) ? 0.25 О fcp.
Therefore, in the case of -fcp = 15.75 KH2, f characteristic (-3 dB) = 4 KHz. Of course, it is
reasonable to design the cutoff frequency of the low-pass filter composed of the transistor Tr1
etc. and the low-pass filter composed of the transistor Tr2 at about 4 KHz. Thirdly composed of
the transistor Tr4 etc. The phase characteristic of the phase shift circuit to be selected is shown
in FIG. The phase characteristic shown in FIG. 3 indicates the phase difference between the
outputs 5 and 6. In FIG. 1, a circuit block 7.8 is a drive circuit of a general audio circuit, and
circuit blocks 9 and 10 are power amplifier circuits, each driving a speaker 11.12. In FIG. 1,
when the switch 2 is in the open state, the monaural signal from the monaural signal source 1
drives the speaker 11.12 with the characteristics determined by the characteristics of the drive
circuits ? and 8 and the power amplification circuits 9 and 10, For example, it is the frequency
characteristic shown in FIG. Now, when the switch 2 is in the closed state, the monaural signal is
delayed by about 4 m5 ec by the delay circuit, and the delayed signals 5, 6 have resistance r9. A
matrix circuit consisting of r1 o and r11 and a resistor r12.degree. 1131 r14, 0 'mixed with the
original monaural signal. X 2 IQin ? teee * ++ e * 11 * * e * * fist @ bone ииииииииииииииииииии (1) (I is the
amplitude, ? = 2?f, t is the time) This monaural signal is time When a delay of T is received, the
audio signal is expressed by the following equation: OY "I 281 n ? (t?T)... If the voice signal that
received 0 or delay is combined with the voice signal of the opposite phase, the following
equation is obtained according to the following equation. 0EndPage: 2 According to equations (3)
and (4) It changes with frequency and delay time. Specifically, the delay signal having the
frequency characteristic of FIG. 2 has the frequency characteristic shown in FIG. 4 (this
frequency characteristic is mainly determined by the power amplification circuit 9.10 of FIG. 1).
The frequency characteristics of the outputs of the power amplification circuits 9 and 1o when
the delay time is about 4 m5 ec when combined with the voice signal are as shown in FIG. 5 and
FIG. 6, respectively.
The frequency characteristics shown in FIGS. 6 and 6 are shown in equations (1) and (2) for the
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case of an Oker swing ratio of 2 / work and L: r1.4. This amplitude ratio can be controlled by the
gain of the amplifier circuit constituted by "r3 etc." in FIG. Next, the amplitude ratio 1- / in the
equations (1) and (2), -1. The frequency characteristic of the phase difference between the
outputs of the power amplification circuits 9 and 1 o in the case of ? is shown in FIG. In FIG. 7, in
the frequency range from about 500 Hz to 5 KHz of the audio signal, the phase difference
between the outputs of the power amplification circuits 9 and 1o fluctuates in the range of 18 o
0 ▒ 90 'as a function of frequency. In the region where the audio signal is about 4 KHz or more,
the outputs of the power amplification circuits 9 and 1 o are in the same phase because there is
no output of the delay signal. In the frequency range from 1 oHz to about 600 Hz for audio
signals, the output changes from the same phase to 180 ░. The reason why the direction of the
sound source of the listener can be determined is explained by the difference in the intensity of
sound reaching both ears and the phase difference of the sound waves reaching both ears. When
the phases of sounds coming to both ears are equal, the sound source seems to be in front and
the sound source is generated in the rear. Next, when the phase of the sound of both ears is
different, the sound image gradually moves to the ear producing the phase. This binaural phase
effect appears in relatively low frequency sounds, and the effect of the phase difference does not
appear above a certain limit. This limit is assumed to be 1260 Hz on average. The sound source
judgment in the sound of higher frequency is the difference in the intensity of the sound in both
ears, and the difference in the intensity between the both ears because the size of the head is as
large as the wavelength of the sound The reason is because The acoustic power is a function of
the distance between the sound sources and the frequency in the sound radiation from the
antiphase 2 sound source on the basis of the sound theory described above. That is, if the phases
of the two sound sources are reversed in phase with respect to the low frequency signal, the
acoustic force is reduced. In the low frequency range of about 500 Hz or less, the phase
difference reaching the both ears is greater in phase effect so that the phase difference is larger
The power is reduced. The configuration is as described above, and according to the present
invention, the following effects can be obtained. (1) If the amplitude ratio in the equations (1) and
(2) is set to 2.2 //, the phase difference of the sound waves in both ears is within the frequency
range of about 500 Hz to 2 KHz. The sound source changes as a function of frequency in the
range of 180 soil race '. (2) The amplitude ratio in the equations (1) and (2)! ???? If the cutoff frequency of the delay signal is about 3 KH 4 #, the phase difference of the sound waves in
both ears is in the range of 180 ? ? about 90 ? ? in the frequency range from about 2 KHz to
5 ?The acoustic power ratio from one speaker, which varies as a function of frequency and is
paired with the frequency, is maximized, and the frequency characteristics of the other speaker
are symmetrical with the other speaker, so The sound source is expanded.
(3) By providing a phase shift circuit in the delay signal circuit in the frequency range up to
frequency 10 KHz-500) (z), the phase difference between both ears is reduced to prevent
deterioration of the acoustic power in the low frequency signal, Eliminate the sound of the lack of
bass.
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4. Brief description of the drawings FIG. 1 is an electric circuit diagram of a sound image
enlarging acoustic device in one embodiment of the present invention, FIG. 2 is a frequency
characteristic diagram of a delay signal of the device according to the present invention, and FIG.
FIG. 4 is a phase characteristic diagram of a phase shift circuit of the device, FIG. 4 is a frequency
characteristic diagram of an audio output circuit of the device according to the invention, and
FIG. 5 is an audio output circuit when one channel of the device according to the invention is
closed. Frequency characteristic diagram, FIG. 6 EndPage: FIG. 3 is a frequency characteristic
diagram of the audio output circuit when the channel of one side of the device according to the
present invention is in the closed state FIG. FIG. 1 и и и и и и и monaural signal source и и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и и и и и и и и и и и и и и и и и .8...... Drive circuit, 9, IQe... ? Power amplification circuit, 11.12. Name of
agent Attorney Nakao Toshio is one person Figure 2 f (FIZ)! @ 3 Fig. (Hz) Fig. 115 Fig. 7 Fig. 7 "'"'.
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