JPH11275684

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DESCRIPTION JPH11275684
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
television receiver, and more particularly to a television receiver for outputting, for example, a
received audio signal from a built-in speaker and an external speaker.
[0002]
2. Description of the Related Art A so-called home theater system has conventionally been
available which connects an external speaker to a television receiver to achieve the same sense of
realism as a movie theater at home. According to this system, it is possible to enjoy a powerful
movie at home by watching the video on the display of the television receiver and listening to the
audio from the external speakers disposed on both sides of the room. On the other hand, in
programs other than movies, such as news, for example, such a viewing method is not necessary.
Rather, it is often desirable to turn off the external speaker and listen to the sound through the
built-in speaker. For this reason, the viewer (operator) switched the speaker to be used according
to the program.
[0003]
However, in the conventional television receiver, there is a problem that it takes time to switch
the speaker to be used. That is, when watching a movie program, it is necessary to operate the
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volume key to turn off the output of the built-in speaker and turn on the external speaker, and
when watching a news program, increase the output of the built-in speaker, I had to turn off the
external speakers. In addition, since the buzz occurs if the performance of the built-in speaker is
poor, it is necessary to turn off the built-in speaker in a program requiring high sound quality
such as a movie.
[0004]
Therefore, a main object of the present invention is to provide a television receiver capable of
easily securing an audio output condition suitable for a viewer.
[0005]
According to the present invention, in a television receiver for outputting an audio signal from
one of a built-in speaker and an externally mounted speaker, the built-in speaker and the
externally mounted speaker are complementarily set in response to an instruction from an
operator. A television receiver characterized by comprising on / off means for turning on / off.
[0006]
When the operator operates the home theater key provided on the remote control transmitter
while sound is being output from the built-in speaker, the home theater mode is set.
At this time, the built-in speaker is turned off and the external speaker is turned on.
When the operator operates the home theater key again, the normal mode is restored, the builtin speaker is turned on, and the external speaker is turned off. That is, when a movie program is
to be broadcast, it is possible to view with a sense of presence by means of an external speaker,
and when a news program is to be broadcast, it is possible to perform normal viewing by means
of the built-in speaker.
[0007]
According to the present invention, since the built-in speaker and the external speaker are
complementarily turned on / off in response to the instruction of the operator, it is possible to
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easily secure a sound output state suitable for the viewer. The above object, other objects,
features and advantages of the present invention will become more apparent from the detailed
description of the following embodiments given with reference to the drawings.
[0008]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, a television
receiver 10 of this embodiment includes an antenna 12. As shown in FIG. The high frequency
signal received by the antenna 12 is supplied to the tuner 14, and an intermediate frequency
signal of a desired channel is generated in accordance with the control signal from the tuning
control circuit 16. The intermediate frequency signal is applied to a video intermediate frequency
amplification circuit 20 provided in the video signal processing circuit 18.
[0009]
The intermediate frequency signal includes a video component and an audio component, and the
video intermediate frequency amplification circuit 20 amplifies only the video component, that is,
the video intermediate frequency signal, and supplies the amplified signal to the video detection
circuit 21. A video intermediate frequency signal is detected by the video detection circuit 21 to
generate a composite video signal. The composite video signal is then applied to the video
amplification circuit 22, and amplification processing is performed only on the luminance signal.
The amplified luminance signal is supplied to the video amplification circuit 26 via the video
delay circuit 24 and is amplified again. Thereby, a luminance signal having a desired level is
obtained.
[0010]
The video amplification circuit 22 also inputs the input composite video signal to the band
amplification circuit 30 included in the color demodulation circuit 28. The band amplification
circuit 30 separates the carrier color signal from the composite video signal, and amplifies the
carrier color signal to a predetermined level. The band amplification circuit 30 also inputs the
input composite video signal as it is to the burst amplification circuit 40 included in the color
synchronization circuit 38. The burst amplification circuit 40 extracts and amplifies a color burst
signal from the composite video signal, and inputs the amplified color burst signal to an APC
(Automatic Phase Control) circuit 42. Thereby, the phase of the color burst signal is automatically
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adjusted. The color subcarrier generation circuit 44 generates a color subcarrier based on the
color burst signal whose phase is adjusted in this manner, and inputs the color subcarrier to the
phase shift circuit 46. The phase shift circuit 46 generates, from the input color subcarriers, a
first reference subcarrier and a second reference subcarrier having a 90 ° phase difference with
each other. Then, the first reference subcarrier is provided to the color demodulation circuit 32,
and the second reference subcarrier is provided to the color demodulation circuit 34.
[0011]
The carrier color signal generated by the band amplification circuit 30 is input to the color
demodulation circuits 32 and 34. The color demodulation circuit 32 demodulates the carrier
color signal according to the first reference subcarrier, and the color demodulation circuit 34
demodulates the carrier color signal according to the second reference subcarrier. Thereby, the
color demodulation circuits 32 and 34 output different color signals. The matrix circuit 36
generates color difference signals R-Y, G-Y and B-Y based on these color signals, and inputs them
to the primary color output circuit 37. The luminance signal output from the video amplification
circuit 26 is also input to the primary color output circuit 37, and the R signal, G signal and B
signal are output from the primary color output circuit 37. As a result, the broadcast video is
displayed on the display 47. When a character signal is output from the character generator 39,
this character signal is mixed with the RGB signal from the primary color output circuit 37, and
the character is displayed on the display 47 on screen.
[0012]
The video intermediate frequency amplification circuit 20 also extracts an audio intermediate
frequency signal from the input intermediate frequency signal, and inputs it to a 4.5 MHz
detection circuit 50 included in the audio signal processing circuit 48. The 4.5 MHz detection
circuit 50 performs frequency conversion on the audio intermediate frequency signal by the
intercarrier method to generate a beat signal (SIF signal) of 4.5 MHz. The generated beat signal is
amplified by the voice intermediate frequency amplification circuit 52, and then the amplified
signal is detected by the FM detection circuit 54. The audio amplification circuit 56 amplifies the
detected audio signal and supplies the amplified signal to the audio output device 58. By this, a
desired voice is output. The built-in speaker 59 is formed by the audio signal processing circuit
48 and the audio output device 58.
[0013]
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The audio intermediate frequency signal output from the video intermediate frequency amplifier
circuit 20 is also applied to the output terminal S1 via the signal line L1 when the switch SW1 is
on, and is output to the external speaker 60 from the output terminal S1. . Then, the same signal
processing as described above is performed, and the desired sound is output from the sound
output device 72. However, the 4.5 MHz detection circuit 64 provided in the external speaker 60
adopts a PLL intercarrier system, and thereby no buzz or buzz beat occurs in the generated beat
signal. In other words, the 4.5 MHz detection circuit 50 provided in the built-in speaker 59
adopts the intercarrier method, so buzz and buzz beat occur, but the external speaker 60 adopts
the high performance PLL intercarrier method, so Such voice interference does not occur. The
audio signal processing circuit 62 and the audio output device 72 form an external speaker 60.
[0014]
The CPU 74 processes the flowcharts shown in FIGS. 3 and 4 in response to the operation of the
home theater key 76a or the volume key 76b of the remote control transmitter 76 shown in FIG.
First, the operations of the home theater key 76a and the volume key 76b are monitored in steps
S1 and S25, respectively, and when the home theater key 76a is operated, "YES" is determined in
step S1. It is judged that "YES".
[0015]
When the home theater key 76a is operated, the CPU 74 determines whether the flag 74a is set
at step S3. If "NO", the flag 74a is set in step S5, and then the built-in speaker 59 is turned off
and the external speaker 60 is turned on in steps S7 and S9 respectively. Specifically, the
amplification factor of the audio amplification circuit 56 is set to "0" in step S7, and the switch
SW1 is turned on in step S9. Next, the CPU 74 reduces the brightness and the color of the output
image in step S11. Specifically, the amplification factor of the video amplification circuit 26 is
suppressed to lower the luminance signal level, and the phase shift amount of the phase shift
circuit 46 is changed to lower the level of the color signal output from the color demodulation
circuits 32 and 34. Let Thereafter, in step S13, the character generator 39 is controlled to
display the character "HOME THEATER ON" shown in FIG. 5 on the display 47, and the process
returns to step S1.
[0016]
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If "YES" in the step S3, the CPU 74 resets the flag 74a in a step S15, and turns on the built-in
speaker and turns off the external speaker in each of the steps S17 and S19. That is, the
amplification factor of the audio amplification circuit 56 is returned to the original state, and the
switch SW1 is turned off. Further, in step S21, the amplification factor of the video amplification
circuit 26 is increased, the phase shift amount of the phase shift circuit 46 is set to a
predetermined amount, and the brightness and the color are restored. Thereafter, in step S23,
the character "HOME THEATER OFF" shown in FIG. 6 is displayed on screen, and the process
returns to step S1.
[0017]
As will be understood from the above description, when the flag 74a is set, the home theater
mode is set, and when the flag 74a is reset, the normal mode is set. That is, in the home theater
mode, sound is output only from the external speaker 60, and in the normal mode, sound is
output only from the built-in speaker 59. Also, in the home theater mode, the brightness and the
color of the image are reduced compared to the normal mode.
[0018]
When the volume key 76b is operated, the CPU 74a determines "YES" in step S25, and
determines whether the flag 74a is set in step S27. If "YES" here, that is, if it is the home theater
mode, the character "HOME THEATER ON" is displayed on the display 47 as shown in FIG. On the
other hand, if the flag 74a is reset, that is, in the normal mode, the CPU 74 changes the audio
level by an amount corresponding to the operation of the volume key 76b in step S31, and then
as shown in FIG. Display the character corresponding to the voice level on screen.
[0019]
That is, in the home theater mode, the built-in speaker 59 is turned off, and even if the volume
key 76 b is operated, the sound level can not be changed. The sound level of the external speaker
60 needs to be adjusted by a volume key (not shown) provided on the external speaker 60. In
such a case, the character shown in FIG. 5 is displayed on screen in response to the operation of
the volume key 76b so that the operator does not misunderstand that the built-in speaker 59 is
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broken.
[0020]
According to this embodiment, since the home theater mode and the normal mode are toggled
simply by the operator operating the home theater 76a, the operator can easily turn on / off the
home theater function. In this embodiment, when the volume key 76b is pressed during setting
of the home theater mode, the character shown in FIG. 5 is displayed to inform the operator that
the current mode is the home theater mode. The light emitting diode may emit light instead of
the screen display. Also, although this embodiment has been described using an analog television
receiver, the present invention can also be applied to a digital television receiver.
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