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JPH06169441

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DESCRIPTION JPH06169441
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
television receiver, and more particularly to the technology of a speaker built into the television
receiver.
[0002]
2. Description of the Related Art Various types of television receivers have been developed as
speakers with built-in ability to reproduce stereo sound. That is, one speaker unit is attached to
the left and right sides of the image display section usually composed of a cathode ray tube, etc.,
the left channel audio signal is supplied to the left speaker unit, and the right speaker unit is for
the right channel. An audio signal is supplied, and stereo audio is reproduced from the left and
right speaker units. According to the television receiver capable of reproducing such stereo
sound, the sound reproduction with a sense of presence by stereo sound is performed.
[0003]
On the other hand, in recent years, the performance of a speaker incorporated in a television
receiver has been enhanced to improve the frequency characteristics and the like of reproduced
sound. That is, conventionally, a relatively small speaker unit has been used as a speaker built in
a television receiver, and reproduction of sound with a proper sound quality has been performed.
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On the other hand, in recent years, when viewing a video program reproduced from a television
broadcast or a video tape, it is required to reproduce high-quality sound, and a relatively large
speaker is attached to the television receiver. The thing is done. In order to improve the sound
quality of such a speaker, for example, the reproduction characteristic of the low band is
improved, and a low band sound of about several tens Hz, which is hardly reproduced by the
conventional television receiver, is reproduced favorably. It is conceivable. As a method of
improving the reproduction characteristic of the low frequency range, there is a method of using
a speaker unit having a relatively large aperture and housing the speaker unit in a speaker box.
[0004]
However, when a high-performance speaker device is incorporated in a television receiver, the
manufacturing cost of the television receiver is increased. That is, a speaker device having good
frequency characteristics and the like is expensive, and such high performance is not preferable
from the viewpoint of the manufacturing cost of a television receiver. In particular, since the
above-described stereo audio reproduction type requires a total of two speaker devices on the
left and right sides, a television receiver for reproducing monaural audio provided with only one
speaker device Compared to the machine, it doubles the manufacturing cost.
[0005]
Also, from the viewpoint of the configuration of the television receiver, it is not preferable to
incorporate a high-performance speaker device. That is, in general, a high-performance speaker
device is large, and if a large speaker box or the like is incorporated in the television receiver, the
television receiver becomes large accordingly. Also in this case, since the type that reproduces
stereo sound requires two speakers, the space required for the speaker device is twice as large as
that of a television receiver that reproduces monaural sound. The receiver will be made larger.
[0006]
SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention
to improve the performance of a speaker of a television receiver that reproduces stereo audio,
with almost no change in manufacturing cost and installation space.
[0007]
According to the present invention, for example, as shown in FIG. 1, speakers 3 and 4 are
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disposed on the left and right sides of an image display unit 2, and stereo sound is reproduced
from the speakers 3 and 4 respectively. In the television receiver, one of the left and right
speakers 3 is composed of a mid-high range reproduction type speaker unit, and the other
speaker 4 has a reproduction characteristic of lower range sound than the mid-high range
reproduction type speaker unit. It is configured to be an excellent all band reproduction type
speaker unit.
[0008]
In this case, the low-frequency component of the audio signal of one channel constituting the
stereo audio signal is mixed with the audio signal of the other channel and reproduced from the
speaker unit constituting the other speaker. is there.
[0009]
In this case, the speaker box 5 contains a full band reproduction type speaker unit constituting
the other speaker.
[0010]
[Operation] When performing stereo reproduction, a directional signal is a component of a
relatively high frequency band, relatively low frequency band voice has little sense of direction,
and a relatively low frequency band voice is from only one speaker. Even if it is reproduced, the
stereo feeling of the sound is not impaired.
[0011]
Also, in this case, the low-frequency component of the audio signal of one channel constituting
the stereo audio signal is mixed with the audio signal of the other channel, and reproduced from
the speaker unit constituting the other speaker. Low-frequency sound of both channels
constituting stereo sound is well reproduced from the other speaker.
[0012]
Furthermore, in this case, by storing the full band reproduction type speaker unit constituting the
other speaker in the speaker box, the low frequency sound is reproduced efficiently and
satisfactorily.
[0013]
An embodiment of the present invention will be described below with reference to the
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accompanying drawings.
[0014]
In this embodiment, the present invention is applied to a television receiver capable of
reproducing stereo sound. FIG. 1 is a perspective view showing a state in which the speaker
device of this embodiment is attached to a television receiver. The television receiver 1 has a
cathode ray tube 2 as an image display unit at the center of the front of the television receiver 1,
and speakers 3 and 4 at the left and right sides of the cathode ray tube 2.
Then, the speaker 3 on the right side toward the receiver is configured by a mid-high frequency
reproduction type speaker unit, and the left side speaker 4 is a full band reproduction type
speaker having better low-frequency sound reproduction characteristics than the right speaker
unit. Composed of units.
In this case, the mid-high frequency reproduction type speaker unit constituting the right side
speaker 3 has a characteristic of reproducing voice of several hundreds Hz or more, and the full
band reproduction type speaker unit constituting the left side speaker 4 has several tens Hz It is
assumed that the above-mentioned sound is reproduced and any speaker unit is a cone-type
speaker unit.
[0015]
And the speaker unit which comprises each speaker 3 and 4 uses what is substantially equal
about the reproduction | regeneration characteristic (sound pressure etc.) of the audio | voice of
middle-high range more than several hundreds Hz.
Note that the full band reproduction type speaker unit constituting the left side speaker 3 usually
has a diameter larger than that of the middle high frequency reproduction type speaker unit on
the right side.
[0016]
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Then, in the present embodiment, the speaker box 5 accommodates the full band reproduction
type speaker unit that constitutes the left speaker 4.
The speaker box 5 is disposed in the space on the back side of the cathode ray tube 2 as shown
in cross section in FIG.
Also, the lower part of the front speaker unit has a port 6 to be configured as a bass reflex
speaker.
That is, the air in the speaker box 5 is inverted in phase from the port 6 and discharged to the
outside, and the sound emitted from the back side of the speaker unit attached to the speaker
box 5 is inverted in phase and output to the outside .
With such a bass reflex type speaker, the bass reproduction efficiency is improved.
[0017]
Then, protective members (not shown) such as saran nets are disposed in front of the left and
right speakers 3 and 4 so that the left and right speaker units and the port 6 can not be seen
directly from the front side.
[0018]
Next, a configuration for supplying stereo audio signals to the left and right speakers 3 and 4 is
shown in FIG. 3. In this example, the audio signal of the right channel obtained at the input
terminal 11 of the right channel audio signal is The amplified signal is supplied to the power
amplifier 14 through the filter 12 and the amplified output of the power amplifier 14 is supplied
to the speaker unit constituting the speaker 3 on the right side.
In this case, the cut-off frequency of the high-pass filter 12 is several hundreds Hz, and is
matched with the reproduction characteristic of the speaker unit constituting the speaker 3 on
the right side.
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Further, the audio signal of the right channel obtained at the input terminal 11 is supplied to the
low pass filter 13, and the output of the low pass filter 13 is supplied to the mixer 16. The cutoff
frequency of the low pass filter 13 is also set to several hundreds Hz, and the low frequency
component not to be reproduced is extracted from the speaker unit constituting the speaker 3 on
the right side.
[0019]
Then, the left channel audio signal obtained at the left channel audio signal input terminal 15 is
supplied to the mixer 16, and the low frequency component of the right channel audio signal is
mixed with the left channel audio signal. Then, the mixed output of the mixer 16 is supplied to
the power amplifier 17, and the amplified output of the power amplifier 17 is supplied to the
speaker unit constituting the left speaker 4.
[0020]
With such a configuration, when stereo sound is to be reproduced from the receiver, the midhigh frequency component of the sound signal of the right channel is reproduced from the
speaker 3 on the right side. The low frequency component of the audio signal is reproduced from
the left speaker 4. Here, when stereo reproduction is performed, a directional signal that affects
the sense of stereo (stereoscopic sense) is a component of a relatively high frequency band, and
the voice of a relatively low frequency band has little sense of direction. Therefore, even if only
middle and high frequency components are separated from the left and right speakers and
reproduced, realistic stereo reproduction is performed, and even if sound in a relatively low
frequency band is mixed and reproduced from only one speaker, There is no loss of stereo sound.
[0021]
Thus, even though the stereo reproduction is performed satisfactorily, only one speaker needs to
use the speaker unit capable of reproducing well to the low frequency, and the other speaker unit
reproduces only the middle and high frequency. A television receiver which can be relatively
inexpensive and can reproduce good stereo sound can be configured inexpensively.
[0022]
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Further, it is sufficient to provide only one speaker box with a speaker box necessary for good
reproduction of low-frequency sound, and the television receiver can be miniaturized as
compared with the case where two speaker boxes are provided on the left and right.
[0023]
In the above-described embodiment, the voices in the entire band are output from the left
speaker, and the mid-high range audio is output from the right speaker. However, the left and
right configurations may be reversed.
[0024]
In the above embodiment, the left speaker is the bus reflex type speaker, but the speaker box
may be a speaker having no port.
Alternatively, the speaker box may be omitted.
[0025]
Furthermore, although the low frequency components of the left and right audio signals are
mixed and reproduced from the speaker in which the low frequency components are reproduced
in the above embodiment, it is not necessary to mix them.
That is, since the low frequency component is originally non-directional, in the case of a normal
stereo audio signal, the low frequency component is substantially the same signal, and the mixing
configuration shown in FIG. 3 is omitted to simplify the circuit configuration. You may.
[0026]
According to the present invention, at least two of the necessary speakers for reproducing stereo
sound are all-band reproduction type speaker units having excellent low-frequency sound
reproduction characteristics. Thus, the other speaker is a relatively inexpensive and compact
mid-high frequency reproduction type speaker unit, and the stereo speaker for a television
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receiver is configured inexpensively and small.
In this case, when stereo reproduction is performed, the directional signal is a relatively high
frequency component, and the relatively low frequency sound has little sense of direction, and
the relatively low frequency sound is from only one speaker. Even if it is reproduced, the stereo
feeling of the sound is not impaired.
[0027]
Also, in this case, the low-frequency component of the audio signal of one channel constituting
the stereo audio signal is mixed with the audio signal of the other channel, and reproduced from
the speaker unit constituting the other speaker. Low-frequency sound of both channels
constituting stereo sound is reproduced well.
[0028]
Furthermore, in this case, by storing the full band reproduction type speaker unit constituting the
other speaker in the speaker box, the low frequency sound is reproduced efficiently and
satisfactorily.
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