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JPH0560078

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DESCRIPTION JPH0560078
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
wireless speaker apparatus, and more particularly to a wireless speaker having a function of
receiving an audio signal sent as an optical signal and converting it into an electrical signal to
drive the speaker. It relates to the device.
[0002]
2. Description of the Related Art Conventionally, wireless speaker devices have been used for the
purpose of eliminating wiring to a speaker system or simultaneously driving a plurality of
speaker systems without wiring. For this purpose, there is known an apparatus for spatially
transmitting an audio signal using radio waves or light.
[0003]
However, those using radio waves are subject to legal restrictions due to problems such as radio
wave interference and band allocation, so there is a restriction that the output can be reduced
and can be used only within a limited range. Moreover, in the case of radio waves, there is no
way but AM or FM modulation of the audio signal due to the band, and the demodulated audio
signal has poor S / N and large distortion and poor sound quality, so CD (compact disc) or BS
(satellite There is a problem in ability to reproduce digital sources such as broadcasting.
01-05-2019
1
[0004]
An optical digital space transmission system using light is drawing attention as a space
transmission system that compensates for the defects of such radio waves. This is a spatial
transmission of an optical signal such as a laser beam or infrared light that is PCM-modulated by
a digital signal obtained by A / D converting a source such as an audio signal, and the optical
signal received on the receiving side is demodulated to obtain an analog source. It is a method of
returning to a signal, and extremely high fidelity can be obtained. The wireless speaker apparatus
is designed to drive a speaker system that reproduces an audio signal as sound on the receiving
side, which enables good reproduction of audio.
[0005]
FIG. 4 is a schematic block diagram of such a conventional wireless speaker apparatus, and
particularly shows the configuration of the receiving side. In the figure, 1 is an infrared light
receiving unit for receiving an optical signal sent from a transmitting unit (not shown) based on
an audio signal by digitally modulating infrared light and transmitting it to an electrical signal,
amplifying and demodulating it into an analog audio signal , 4 are applied through the
connection cord 5 to the audio signal received by the infrared receiver 1 and amplified by this
amplifier, 7 is a speaker which receives the amplified audio signal from the amplifier 4 through
the connection cord 6 and is reproduced as voice Is a speaker box that houses the
[0006]
In the configuration as described above, the digitally modulated light signal from the transmitting
unit (not shown) is received by the infrared light receiving unit 1, and the voice signal returned
to the analog original signal is amplified through the connection cord 5 by the amplifier 4 Given
to The amplifier 4 amplifies the analog audio signal into a signal sufficient to drive the speaker in
the speaker box 7 and supplies the signal to the speaker box 7 through the connection cord 6 to
reproduce the sound.
[0007]
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2
Since the conventional wireless speaker device is configured as described above, it requires three
devices, the infrared light receiving unit 1, the speaker box 7, and the amplifier 4, and the
installation location is wide. Not only the cost but also the cost. In addition, the wiring using the
connection cords 5 and 6 when installing the wireless speaker device is not only very
troublesome but also difficult to move after installation, so the characteristic that the installation
place of the wireless speaker device is not chosen It hurts In addition, the infrared light receiving
unit 1 is likely to be blocked by a moving person depending on the installation place and the light
signal is easily blocked, and there is a problem that the reproduction sound is interrupted, and
there is an inconvenience that it takes time to select the installation place. .
[0008]
The present invention has been made to solve the problems of the prior art as described above,
in which the infrared light receiving portion, the speaker system and the amplifier are integrally
formed and the infrared light receiving portion is installed at a relatively high position. It is an
object of the present invention to provide a wireless speaker device which simplifies installation
and movement and reduces reception interference.
[0009]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
provides a light receiving section for receiving an optical signal digitally modulated based on an
audio signal, and light received by the light receiving section. A demodulation unit that converts
the electric signal into a voice signal, an amplification unit that amplifies the voice signal from
the demodulation unit, and a speaker that outputs the amplified voice signal from the
amplification unit as voice are in the same housing It is particularly advantageous to be integrally
attached and to arrange the light receiver on the top of the housing.
[0010]
In the above means, the wireless speaker device of the present invention receives the light signal
modulated based on the audio signal in the light receiving portion provided in the upper part of
the housing, and converts it into the electric signal in the demodulation portion. It converts and
demodulates to an audio signal, amplifies it by an amplification part arranged in the same case,
drives a speaker, and reproduces an audio.
[0011]
Embodiments of the present invention will be described below with reference to the drawings.
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[0012]
FIG. 1 is a longitudinal sectional view of a wireless speaker apparatus according to an
embodiment of the present invention, and FIG. 2 is a top view of the arrangement of FIG.
In each figure, 2 is a cylindrical speaker system incorporating a plurality of speaker units 2a, 3 is
a speaker system pedestal which holds the speaker system 2 at the bottom and incorporates an
amplifier 4 therein.
[0013]
FIG. 3 is a longitudinal sectional view showing the internal structure of the infrared ray receiving
unit 1 of FIG.
In the figure, 1a is a light receiving portion case constituting the infrared light receiving portion
1, 1b is a light receiving condenser for condensing infrared light 1 d transmitted digitally based
on an audio signal from a transmitting portion not shown on the light receiving element 1c. A
lens 1e is a D / A conversion circuit for amplifying a digital modulation signal received by the
light receiving element 1c and converted into an electric signal, performing D / A conversion to
convert it into an analog original audio signal, and transmitting it to the connection code 5 .
[0014]
As is apparent from the figure, the infrared ray receiving unit 1 is attached to the top of the head
of the speaker system 2 and is an optical signal transmitted from the transmitting unit (not
shown) based on the audio signal and transmitted digitally. 1d is received and collected on the
light receiving element 1c through the light receiving condenser lens 1b.
The light receiving element 1c converts the infrared ray 1d into an electric signal and supplies
the electric signal to the D / A conversion circuit 1e.
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4
The D / A conversion circuit 1e amplifies this electric signal and demodulates it through D / A
conversion to obtain an audio signal returned to an analog original signal. This audio signal is
sent to the amplifier 4 fixed inside the speaker system pedestal 3 disposed at the lower position
of the speaker system 2 through the connection cord 5 wired inside the speaker system 2. The
amplifier 4 amplifies the audio signal received by the infrared light receiving unit 1 to a signal
sufficient to drive the speaker unit 2a. The output of the amplifier 4 is applied to the speaker unit
2a through the connection cord 6, but the speaker unit 2a re-creates the amplified audio signal
from the amplifier 4 in the speaker system 2 as audio.
[0015]
According to the above construction, since the infrared ray receiving portion 1 is attached to the
top of the cylindrical elongated speaker system 2, the received infrared rays 1d are not easily
blocked by a moving person or the like, and a good voice is obtained. Can continue to reproduce.
Further, since the relatively heavy amplifier 4 is mounted inside the speaker system pedestal 3
provided below the speaker system 2, it is effective in increasing the stability of the
longitudinally elongated speaker system 2. Further, the infrared light receiving unit 1, the
speaker system 2, and the speaker system pedestal 3 are substantially integrated, and the light
receiving element 1c, the D / A conversion circuit 1e, the speaker unit 2a and the amplifier 4 are
built in each Since the connection is made by the connection cords 5 and 6 wired inside the
speaker system 2, the installation and the movement are greatly simplified.
[0016]
Although the above embodiment exemplifies a configuration for digitally modulating an audio
signal, it is of course applicable to any other modulation method. Further, the shape of the
speaker system 2 does not have to be cylindrical, and any shape can of course be applied as long
as it has a sufficient height for mounting the infrared ray receiving unit 1 at a high position. In
the above embodiment, the infrared light receiving unit 1 is disposed at the top of the head of the
speaker system 2, and the amplifier 4 is installed in the speaker system pedestal 3 at the bottom
of the speaker system 2. Can achieve the initial purpose by selecting a relatively high position of
the speaker system 2, and a relatively low position may be selected for the amplifier 4 without
sticking to the bottom. Also, if the stability of the speaker system 2 can be secured by another
method, the installation place of the amplifier 4 is particularly restricted.
[0017]
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As described above, according to the present invention, since the wireless speaker device is
configured to integrate the infrared light receiving unit, the speaker system, and the amplifier
into one housing, installation of the speaker system is achieved. This eliminates the need for
wiring work accompanying the movement and movement, greatly improves handling, and is easy
to reduce in cost, and can be set at a high location for the infrared light receiver, so that
reception interference is less likely to occur. is there.
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