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JPH05145870

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DESCRIPTION JPH05145870
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
television receiver.
[0002]
2. Description of the Related Art In recent television broadcasting, audio multiplex broadcasting
is performed, and in response to this, a television receiver determines whether it is a monaural
mode or a stereo mode and selects an audio signal corresponding to each mode. The
demodulation processing is performed so that the speaker of the television receiver can output
the sound according to each mode. The optimum sound field of the audio signal output from the
television receiver differs depending on the type of audio signal to be broadcast. For example, in
a program such as news, since the voice of the announcer is the main sound source, the sound
image is preferably localized at the center of the screen. Furthermore, in the case of music
programs and the like, it is preferable that the so-called ultra-wide which spreads further to the
left and right than in a drama program. Therefore, the left and right speakers are made rotatable
around the vertical axis, and the viewer adjusts the angle of the speakers manually or by
operating the remote control device according to the type of the audio signal to be broadcast.
The configuration provided is already known.
[0003]
However, in the above-described conventional example, the adjustment of the angle of the
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speaker is troublesome because it is performed manually or by the operation of the remote
control device, and it is not easy to use.
[0004]
An object of the present invention is to provide a television receiver that solves the above
problems.
[0005]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the feature of
the present invention is to provide a pair of left and right speakers rotatably mounted on a
television receiver main body around a vertical axis, Drive means for rotationally driving the
speaker around the vertical axis, mode determination means for determining whether the
received audio signal is in stereo mode or monaural mode, frequency component determination
means for determining the frequency component of the received audio signal, and mode
determination The control means controls the drive means to change the positions of the left and
right speakers to predetermined rotational positions based on the judgment result by the means
and the judgment result by the frequency component judgment means.
[0006]
According to the present invention, the mode discriminating means discriminates whether the
mode of the received voice signal is the stereo mode or the monaural mode.
Further, the frequency component of the received voice signal is determined by the frequency
component determination means.
Then, based on the determination result by the two determination means, the control means
controls the drive means to change the positions of the left and right speakers to a
predetermined rotational position.
Thus, the pair of left and right speakers are rotationally driven around the vertical axis, and are
repositioned to a predetermined rotational position.
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[0007]
FIG. 1 is a horizontal sectional view showing the internal structure of a first embodiment of a
television receiver according to the present invention. In the main body 2 of the television
receiver 1, a pair of left and right speakers 3 </ b> L, 3 </ b> R are disposed facing the opening 5
on both sides of the Braun tube 4. The speakers 3L, 3R are fixedly supported by rotary shafts 6L,
6R having vertical axes, and the rotary shafts 6L, 6R are connected to the output shafts of the
stepping motors 7L, 7R (see FIG. 2). Therefore, the speakers 3L and 3R are rotationally driven
around the rotation shafts 6L and 6R by the driving of the stepping motors 7L and 7R. The
stepping motors 7L and 7R are configured to be driven and controlled according to the type of
the received audio signal as described later, whereby the speakers 3L and 3R are controlled
according to the type of the received audio signal. The automatic angle adjustment is made to
reach a preset rotational position.
[0008]
In the present embodiment, the angles of the speakers 3L and 3R are adjusted according to the
types of three types of audio signals such as announcements of news, dramas, etc., and music
programs. For example, in the case of an announcement such as news, a first rotational position
indicated by reference symbol M1 facing forward, and in the case of a drama etc., a second
rotational position indicated by reference symbol M2 rotated 45 degrees laterally from the first
rotational position The music program is angularly adjusted to a third rotational position
indicated by reference symbol M3 rotated 90 degrees laterally from the first position.
[0009]
FIG. 2 is a block diagram of an audio circuit provided in the first embodiment of the television
receiver according to the present invention. Although not shown, the video signal processing
circuit of the television receiver 1 has a known configuration. The intermediate frequency signal
amplified by the video intermediate frequency amplifier circuit (not shown) is detected by the
audio detection circuit 10 by the video carrier (58.75 MHz) and the audio carrier (54.25 MHz),
and the frequencies of both carriers are detected. The frequency is converted to an audio
intermediate frequency signal of 4.5 MHz, which is the difference, amplified by the audio
intermediate frequency amplifier circuit 11, applied to the audio FM detection circuit 12, and
subjected to FM detection. In addition to the main voice signal, a carrier sub-voice signal in which
the subcarrier is frequency-modulated by the sub voice signal and a carrier multiplex control
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signal in which the subcarrier is amplitude-modulated by the control signal are multiplexed in the
detected signal.
[0010]
The output from the voice FM detection circuit 12 is reduced in high frequency by the deemphasis circuit 13 and flattened, and an unnecessary component (multiplex signal component)
of 0 to 15 KHz or more is removed by the low pass filter 14 to obtain a main voice signal. Are
given to the speech matrix circuit 15. Further, the output from the voice FM detection circuit 12
is given to the band pass filter 16 and the carrier sub-voice signal is taken out. Then, the carrier
sub-audio signal passes through the amplitude limiting circuit 17, is FM-detected by the
subcarrier FM detection circuit 18, passes sequentially through the de-emphasis circuit 19 and
the low pass filter 20, and does not need 0-15 KHz or more. The component (multiplex signal
component) is removed, and the sub audio signal is applied to the audio matrix circuit 15.
[0011]
The band pass filter 16 is provided with a trap for removing the 55.125 KHz carrier multiplex
control signal, whereby the carrier multiplex control signal is extracted. The carrier multiplex
control signal is detected by the multiplex control AM detection circuit 22, passes through the
amplitude limiting circuit 23, and is FM detected by the multiplex control FM detection circuit 24
as mode determination means. This sets the frequency of each control signal of 2 audio mode
and stereo mode (922.5 Hz for 2 audio mode and 982.5 Hz for stereo mode), and the frequency
for monaural (middle 952.5 Hz) DC voltage corresponding to (1) is taken out. That is, the
detection output voltage is, for example, 1 V in the two audio mode, 4 V in the monaural mode,
and 8 V in the stereo mode, so that different output voltages can be obtained depending on each
audio multiplex mode. Therefore, from the output from the multiplex control FM detection circuit
24, it can be known which of the two-voice mode, the monaural mode, and the stereo mode the
current reception voice signal is.
[0012]
The detection output from the multiplex control FM detection circuit 24 is given to the
changeover switch control circuit 25 and the motor control unit 26, respectively. The changeover
switch control circuit 25 switches the switching mode of each changeover switch described later
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of the voice matrix circuit 15 according to each mode. In the figure, P1 is a control terminal for
forced monaural mode, and P2 is a control terminal for selecting each mode (main voice, sub
voice, main voice + sub voice) of 2 voices. That is, in the two-voice mode, if the voltage value of
the control terminal P2 is set to 0 V, for example, the main voice mode is selected; if 5 V, the subvoice mode is selected; When the voltage value of the control terminal P1 is set to, for example,
4.5 V in the stereo mode, the monaural mode is forcibly set.
[0013]
The audio matrix circuit 15 switches between main audio and sub audio, main / sub changeover
switches S1 and S2, a stereo matrix circuit 28, and four switches S31, S32, S33 and S34 for
switching related to the stereo matrix circuit 28. And consists of The changeover switch control
circuit 25 controls the switching mode of each of the switches S1, S2, S31, S32, S33, and S34 as
shown in Table 1. In the figure, a and b indicate the individual contacts of the switches S1, S2,
S31, S32, S33, and S34, and the main audio signals are transmitted to the individual contacts a of
the switches S1 and S2, and the switches S1 and S2 are also present. The sub audio signal is
given to the individual contact b of.
[0014]
That is, at the time of monaural broadcasting, the main audio signal does not pass through the
stereo matrix circuit 28, and is output from the left and right speakers 3L, 3R as the left and right
audio signals via the low frequency amplification circuits 30L, 30R. In stereo broadcasting, the
left and right audio sum signal (R + L) is sent to the main audio and the left and right audio
difference signal (RL) to the sub audio, and the left audio signal L passes through the stereo
matrix circuit 28 and low frequency amplification is performed. The right audio signal R is output
from the left speaker 3L via the circuit 30L, and is output from the right speaker 3R via the low
frequency amplification circuit 30R.
[0015]
In the case of 2 audio broadcasting, according to the voltage value applied to the control terminal
P2, for example, the main audio signal is from the left and right speakers 3L and 3R when the
main audio mode is selected, and the auxiliary audio signal is From the speakers 3L and 3R, at
the time of selection of the main audio + sub audio mode, the main audio is output from the left
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speaker 3L and the auxiliary audio is output from the right speaker 3R. In stereo broadcasting,
when a voltage of 4.5 V for forced monaural mode selection is externally applied to the control
terminal P1, the main audio signal is output from the left and right speakers 3L and 3R as in
monaural broadcasting. Ru.
[0016]
The output side of the audio matrix circuit 15 is provided with a mixing circuit 35 for mixing the
main audio signal and the auxiliary audio signal, and the output from the mixing circuit 35 is the
frequency component discrimination for discriminating the frequency component of the audio
signal. Circuit 36 is provided. The frequency component discrimination circuit 36 includes, for
example, a low pass filter 37 for blocking 200 Hz or more, a band pass filter 38 for passing a
band of 200 to 5000 Hz, and a high pass filter 39 for blocking 5000 Hz or less. The mixed audio
signals from the mixing circuit 35 are individually supplied to 37 to 39, respectively. The outputs
of the filters 37 to 39 are given to the motor control unit 26. The motor control unit 26 outputs
drive pulses to the stepping motors 7L and 7R based on the combination of the determination of
the stereo / monaural mode by the output from the multiplex control FM detection circuit 24 and
the presence or absence of the output from each of the filters 37-39. The angle adjustment of the
speakers 3L and 3R is controlled.
[0017]
The automatic angle adjustment operation of the speakers 3L and 3R according to the type of
audio signal in the television receiver 1 having the above configuration will be described below.
When the detection output from the multiplex control FM detection circuit 24 is given to the
switching switch control circuit 25, the switching switch control circuit 25 responds to the
voltage level of the detection output and hence to the respective switches S1, S2,. Switching of
S31, S32, S33 and S34 is switched as shown in Table 1 above. As a result, audio signals
corresponding to each mode are output from the left and right speakers 3L and 3R.
[0018]
At the same time, the audio signal from the mixing circuit 35 is applied to the motor control unit
26 through the filters 37 to 39, and the detection output from the multiplex control FM detection
circuit 24 is also applied to the motor control unit 26. Thus, the motor control unit 26
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determines the current rotational position data of the speakers 3L and 3R stored in the storage
unit in the motor control unit 26, and determines the stereo / monaural mode shown in Table 2
and outputs from each filter. The number of drive pulses corresponding to the rotation angle
required from the current rotation position of the speakers 3L, 3R to the rotation position to be
set based on combination data of the presence or absence of rotation and the rotation direction
of the motors 7L, 7R (forward or reverse direction Is calculated to derive drive pulses and motor
rotational direction signals to the stepping motors 7L and 7R. As a result, the speakers 3L and 3R
rotate to reach a rotational position according to the type of audio signal.
[0019]
More specifically, referring to Table 2 above, when the audio signal is an announcement of a
news program, the detection output from the multiplex control FM detection circuit 24 is
determined to be the monaural mode, and the low pass filter 37 Since the output is “0”, the
output of the band pass filter 38 is “1”, and the output of the high pass filter 39 is “0”, the
motor control unit 26 controls the stepping motors 7L and 7R to drive the speakers Angle
adjustment is performed so that 3L and 3R reach the first rotation position M1. This enables the
sound image localization direction to be in the front center.
[0020]
When the audio signal is a drama or the like, the stereo mode is determined by the detection
output from the multiplex control FM detection circuit 24, and the output of the low pass filter
37 is "0" and the output of the band pass filter 38 is "1", Since the output of the high-pass filter
39 is “0”, the motor control unit 26 drives and controls the stepping motors 7L and 7R to
adjust the angles of the speakers 3L and 3R to reach the second rotational position M2. Thereby,
the sound image localization direction can be made wide.
[0021]
When the audio signal is a music program or the like, it is determined to be stereo by the
detection output from the multiplex control FM detection circuit 24, and the output of the low
pass filter 37 is "1" and the output of the band pass filter 38 is "1", Since the output of the highpass filter 39 is “1”, the motor control unit 26 drives and controls the stepping motors 7L and
7R to adjust the angles of the speakers 3L and 3R to reach the third rotation position M3.
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Thereby, the sound image localization direction can be made ultra-wide. In the two sound mode,
as in the monaural mode, the left and right speakers 3L and 3R are positioned at the first
rotational position M1. That is, since the detection output from the multiplex control FM
detection circuit 24 is 1 V in the two sound mode, the motor control unit 26 performs motor
control to change the positions of the left and right speakers 3L and 3R to the first rotation
position M1. Do.
[0022]
Such motor control of the motor control unit 26 is performed at regular intervals, whereby even
if the channel is switched or the program is shifted to the next program, the speakers 3L and 3R
are switched according to the content of the program. The angle is automatically adjusted to
always provide the optimum sound field for the viewer. Although the rotation angles of the
speakers 3L and 3R are selected to be 0 degrees, 45 degrees, and 90 degrees in the above
embodiment, the present invention is not limited to this, and the storage unit in the motor control
unit 26 The rotation angle data stored in may be rewritten to be the rotation angle according to
the characteristics of the speakers 3L and 3R and the surrounding environment, and the
invention is not limited to three steps of angle adjustment, and other multiple steps The angle of
adjustment may be adjusted. In the above embodiment, the speakers 3L and 3R are built in the
television receiver main body 2. However, as shown in FIG. 3, the speakers 3L and 3R are
externally mounted on the television receiver main body 2 and have rotation shafts It may be of a
type rotationally driven around 6L, 6R.
[0023]
As described above, according to the present invention, the left and right speakers can be
automatically adjusted in angle to form an optimal sound field according to the type of audio
signal. Therefore, it is possible to realize a television receiver which is easy to use and has
improved operability as compared with the conventional example.
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