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JPS62109412

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DESCRIPTION JPS62109412
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
3D sound reproducing apparatus comprising a speaker for reproducing middle and high sound
and a speaker for low sound. 2. Description of the Related Art There has been a 3D sound
reproducing apparatus as a system for extracting a low-pitched sound which does not impair the
sense of stereo sound from stereo signals and adding signals of left and right tube channels and
reproducing them by a dedicated speaker. An example of the 3D sound reproducing apparatus
will be described below with reference to FIG. In FIG. 2, 11A and 11B are input terminals for
stereo signals, 12 persons, 12B high-pass filters for extracting middle and high tones of stereo
signals, 14k and 14B power amplifiers for amplifying middle and high tones respectively, 16
persons, Each of 16B is a speaker for reproducing middle and high sound. Also, R1 and R2 are
11 input terminals. A resistor for mixing the stereo signal added to 11 B, 13 is a low pass filter
for extracting the bass from the mixed signal, and 15 is a power amplifier for amplifying the bass
extracted by the low pass filter 13. Reference numeral 17 is a bass speaker. The operation of the
3D sound reproducing apparatus shown in FIG. 2 will be described. Of the stereo signals applied
to the input terminals 11A and 11B, medium to high tones of about 100 H 2 or more pass
through the high pass filters 12 A and 12 B and are amplified by 14 power amplifiers 14 B and
amplified to 16 medium to high sound reproduction speakers 16 B Played from. Also, a part of
the signal applied to the input terminals 11 and 11B is mixed by the resistors R1 and R2 to
become a monaural signal. Of the monaural signal, a low frequency of about * 1oo Hz or less is
extracted by the low pass filter 13, amplified by the power amplifier 16, and reproduced from
the low frequency speaker 17. Problems to be Solved by the Invention However, in the 3D sound
reproducing apparatus having the configuration as shown in FIG. 2, a power amplifier 16 for
amplifying the bass must be added to a conventional two-channel stereo reproducing apparatus.
There was a problem of that. In order to solve the above-mentioned problems, the present
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1
invention is to provide a sound reproducing apparatus which can obtain the same effect as a
conventional 3D sound reproducing apparatus without using a bass power amplifier. SUMMARY
OF THE INVENTION The present invention provides an inverting amplifier that inverts the phase
of a signal applied to a first input terminal, a first amplifier that amplifies a signal that has passed
through the inverting amplifier, and a second input terminal. A second amplifier for amplifying
the signal applied to the first and second capacitors, a capacitor for blocking bass, which is
connected between the output terminal of each of the first and second amplifiers and the middle
and high-tone reproduction speaker;
A bass speaker connected between output terminals of a second power amplifier, the bass
speaker and the first speaker. It is comprised by the low pass filter comprised with the coil and
capacitor | condenser which were provided between the output ends of a 2nd power amplifier.
Operation According to the present invention, the first and second power amplifiers function as
BTL type power amplifiers for the bass with the above-described configuration, and the
conventional type shown in the second with two power amplifiers The same effect can be
obtained. EXAMPLE A sound reproducing apparatus according to the present invention will be
described below with reference to FIG. FIG. 1 is a block diagram of a sound reproduction
apparatus according to an embodiment of the present invention. In FIG. 1, IA and IB are input
terminals for stereo signals, 2 is an inverting amplifier for inverting the phase of a signal applied
to one input terminal by 1,800, 3 and 3B are power amplifiers with the same characteristics, 4
and aB is a middle to high-pitched speaker, 5 is a bass speaker, 6 people, 6B is a capacitor for
blocking bass, 7 is a coil, 6C is a capacitor, and a coil 7 and a capacitor 6C constitute a low pass
filter. Among the stereo signals applied to 0 input terminal 1 person, 1B, which will be described
for the operation of the sound reproducing apparatus having the above configuration, the signal
applied to the input terminal 1B is directly applied to the power amplifier 4B. The signal applied
to the old man power terminal is subjected to 180 ° phase inversion by the inverting amplifier 2
and then applied to the three power amplifiers. The signals applied to the power amplifiers 3A
and 3B are amplified to preset amplitudes and applied to the speakers from the output terminals
of the respective power amplifiers 3A and 3B. A part of the output signal of the power amplifiers
3 and 3B drives the middle to high-tone speakers 4A and aB through the bass-rejecting
capacitors 6 and 8B. Here, in order to prevent the effects of stereo by the phase inversion by the
inverting amplifier 2, the four speakers reverse the connection with the power amplifier 3 with
the connection between the power amplifier 3B and the speaker 4B. Furthermore, the other part
of the output signal of the power amplifiers 3A and 3B drives the bass speaker 6 through a low
pass filter composed of the coil 7 and the capacitor 6C. Here, in general, since the bass phase of a
stereo signal of several hundred Hz or less is substantially the same phase, the sound
reproducing apparatus of the present embodiment is a power amplifier 3A in practice. 3B
operates as a BTL amplifier, and the bass is a combination of two input signals of stereo signals,
and the same effect as that of the conventional example shown in FIG. 2 can be obtained.
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Effects of the Invention As described above, according to the present invention, the low-sound
power amplifier that is indispensable in the conventional 3D system reproducing apparatus
becomes unnecessary, and an inexpensive 3D system sound reproducing apparatus can be
provided.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of a 3D sound reproducing apparatus according to an embodiment of
the present invention, and FIG. 2 is a block diagram of a conventional 3D sound reproducing
apparatus.
2 ...... inverting amplifier, three, 3B ...... inverting amplifier, four, aB ...... in treble loudspeaker, 6 ......
bass Subi -h, 6A , AB, ac... Name of Agent Attorney Nakao Toshio Other 1 person Figure 1 Figure
2
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