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JP2000069379

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DESCRIPTION JP2000069379
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
television receiver with voice input, and more particularly to voice input configured to
automatically switch between voice input from an external device and normal television voice.
The present invention relates to an integrated television receiver.
[0002]
2. Description of the Related Art In recent years, there has been an increase in systems requiring,
for example, a center speaker that combines a center speaker, a plurality of front speakers, and a
plurality of rear speakers. As this center speaker, a dedicated speaker may be used, but in many
cases the built-in speaker of the television receiver is also used as the center speaker.
[0003]
An example of a system using such a television receiver with center speaker input is shown in
FIG. Here, it was Dolby Surround System, a trademark of Dolby Laboratories. The speakers 31A
and 31B of the television receiver 31 with a center speaker input and a plurality of speakers, ie,
front speakers 32A and 32B and rear speakers 33A and 33B, are connected to the output
terminal 36 of the amplifier 35, respectively. A monitor output of the television receiver 31 and a
source device 38 such as a compact disc (CD) or a tape recorder (TR) are connected to the input
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terminal 39 of the amplifier 35.
[0004]
In this Dolby Surround system, a video signal output from, for example, a video tape recorder
(VTR) or a laser disk (LD) connected to the television receiver 31 is displayed on the screen of the
television receiver 31 and A sense of reality when watching a movie or the like by amplifying an
audio signal relating to the image by the amplifier 35 and outputting it from the speakers 32A,
32B, 33A, 33B and the speakers 31A, 31B provided in the television receiver 31. Can be
improved.
[0005]
The Dolby Surround system is divided into a phase method for producing an indirect sound by
shifting the phase of the difference signal of the original sound and a delay method for delaying
the difference signal of the original sound to produce an indirect sound.
The Dolby Pro Logic system is a delay system Dolby Surround system, and in addition to the
front sounds supplied to the front speakers 32A and 32B and the rear sounds supplied to the
rear speakers 33A and 33B, the center sound unique to this system is output Be done.
[0006]
By the way, in the television receiver 31 which also uses the above-mentioned speakers 31A and
31B as a center speaker, when the Dolby Surround system is used, the television receiver 31 can
be used. By switching the center speaker input selector switch 40 to connect to the center
speaker, the center sound output from the amplifier 35 is supplied to the speakers 31A and 31B
of the television receiver 31.
[0007]
On the other hand, when only the television receiver 31 is used without using the Dolby
Surround system, the television sound is switched by connecting the center speaker input
selector switch 40 of the television receiver 31 to the television sound. It supplies to speaker
31A, 31B.
[0008]
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As described above, when the speakers 31A and 31B of the television receiver 31 are shared as
the center speaker, the television receiver 31 is used to switch between using the Dolby Surround
system and using only the television receiver 31. The user must manually switch the center
speaker input selector switch 40 by the menu of the television receiver or the remote control,
etc., and the operation is troublesome.
[0009]
Therefore, an object of the present invention is to provide a television receiver configured to
determine whether it is a television sound in a television receiver or an audio input from an
external device and to automatically switch it. .
[0010]
A television receiver according to the present invention is a television receiver having an audio
input function, comprising: an audio input terminal for inputting an audio signal from an external
device; Audio input detection means for detecting an input signal input to an audio input
terminal, a television audio signal obtained by receiving by the television receiver and an input
signal from the external device are switched to be a speaker of the television receiver And
switching means for outputting.
[0011]
In the television receiver according to the present invention, the input signal is a center speaker
input signal, and the audio input terminal is a center speaker input terminal.
[0012]
In the television receiver according to the present invention, the detection of the input signal of
the voice input detection means is performed using an input signal voltage.
[0013]
In the television receiver according to the present invention, the audio input detection means
detects an input signal from the external device and outputs a detection signal when there is an
input signal; When a detection signal is output by the signal detection circuit, the signal detection
circuit is configured of a signal hold circuit that holds the detection signal for a predetermined
time.
[0014]
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Further, in the television receiver according to the present invention, when the audio input
detection means detects the input signal, the switching means outputs the input signal from the
external device to the speaker of the television receiver.
On the other hand, when the audio input detection means does not detect the input signal, the
switching means outputs the television audio signal to the speaker of the television receiver.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a television receiver
according to the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram of a system using a television receiver with center speaker input
according to the present invention.
The television receiver 1 is connected to an amplifier 2 which is an external device, and L and R
front speakers 3A and 3B and rear speakers 5A and 5B are connected to an output terminal 22
of the amplifier 2.
The monitor output of the television receiver 1 and the source device 6 such as a compact disc
(CD) or a tape recorder are input to the amplifier 2 through the input terminal 21, and the center
speaker input terminal of the television receiver 1 from the output terminal 22 of the amplifier 2
The center speaker output is output at 7.
The television receiver 1 is provided with a center speaker input automatic switching device that
automatically determines whether the sound output inside the television receiver 1 or the center
speaker output is to be made and switches the output to the built-in speakers 1A and 1B.
The center speaker input automatic switching device will be described in detail later.
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[0016]
FIG. 4 shows an example of the audio signal processing circuit of the amplifier.
When the power switch 23 of the amplifier 2 is turned on, power is supplied from the power
circuit 24 to each part.
Then, the audio signals of various devices input from the input terminal 21 are selected by the
selection switch 25, separated into the front sound, the rear sound, and the center sound by the
Dolby Surround processor 26, and the front sound and the rear sound are L channels. And R
channels and supplied to respective amplification circuits, that is, front sound amplification
circuits 27A and 27B, rear sound amplification circuits 28A and 28B, and center sound
amplification circuit 29. The outputs of these amplification circuits 27A, 27B, 28A, 28B, 29 are
supplied to the speakers 3A, 3B, 5A, 5B, 1A, 1B through the output terminal 22 (FIG. 1).
reference).
[0017]
Next, the center speaker input automatic switching device will be described. FIG. 2 is a circuit
diagram of a center speaker input automatic switching device in the television receiver. The
audio signal output from the television audio circuit 9 is amplified by the internal amplifiers 10A
and 10B, and is supplied to the terminals 14b and 15b of the relay 11 as switching means. The
center speaker input terminal 7 is connected to the terminals 14 a and 15 a of the relay 11. The
switching contacts 14 and 15 of the relay 11 are connected to the built-in speakers 1A and 1B.
By driving the coil 16 of the relay 11, the switching contacts 14, 15 are switched to be connected
to the terminals 14a, 15a or the terminals 14b, 15b.
[0018]
The signal detection circuit 13 which is a center speaker input detection means controlled by the
microcontroller 12 detects an input signal on the center speaker side inputted to the center
speaker input terminal 7 and relays, if there is an input signal. The coil 16 of 11 is driven to
connect the switching contacts 14 and 15 to the terminals 14a and 15a, and the center sound
output from the amplifier 2 is supplied to the built-in speakers 1A and 1B. Further, the signal
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detection circuit 13 detects an input signal on the center speaker side input to the center speaker
input terminal 7, and when there is no input signal, the coil 16 of the relay 11 is driven to switch
the switching contacts 14 and 15 to the terminal 14b. , 15b, and the television sound is supplied
to the built-in speakers 1A, 1B. Thus, the center speaker input automatic switching device 8 is
configured of the microcontroller 12, the signal detection circuit 13, and the relay 11.
[0019]
FIG. 3 is a block diagram of the signal detection circuit. The signal detection circuit 13 comprises
a DET circuit 17 and a LATCH circuit 18. When an input signal having a predetermined voltage
or more is input to the center speaker input terminal 7, the DET circuit 17 outputs a detection
signal, and the LATCH circuit 18, which is a signal hold circuit, holds the detection signal for a
predetermined time. This prevents the switching contacts 14 and 15 of the relay 11 from being
switched to the terminals 14b and 15b as soon as the input signal to the center speaker input
terminal 7 falls below a predetermined voltage and to be switched to television sound. It is for.
Then, the coil 16 of the relay 11 is driven to connect the switching contacts 14 and 15 to the
terminals 14a and 15a to switch to the center speaker input.
[0020]
Next, the operation of the center speaker input automatic switching device will be described.
There are three types of operation modes of the center speaker: "off", "on", and "automatic". The
operation mode of the center speaker can be selected by the television receiver main body or the
remote control. When the operation mode of the center speaker is "off", the switching contacts
14 and 15 of the relay 11 are connected to the terminals 14b and 15b by the control signal input
from the microcontroller 12 shown in FIG. 2 to the signal detection circuit 13. , And output
television sound from the built-in speakers 1A and 1B.
[0021]
Further, when the operation mode of the center speaker is "on", the switching contacts 14 and 15
of the relay 11 are connected to the terminals 14a and 15a by the control signal inputted from
the microcontroller 12 to the signal detection circuit 13. Thus, the center sound from the
amplifier 2 is output from the built-in speakers 1A and 1B.
[0022]
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When the operation mode of the center speaker is "automatic", the relay based on the level of the
input signal input to the center speaker input terminal 7 by the control signal input to the signal
detection circuit 13 from the microcontroller 12 The eleven switching contacts 14 and 15 are
automatically connected to the terminals 14a and 15a or the terminals 14b and 15b.
When an input signal of a predetermined voltage or more is input to the center speaker input
terminal 7, the DET circuit 17 detects this input signal and outputs a detection signal, and the
LATCH circuit 18 holds this detection signal for a certain period of time. The 11 coils 16 are
driven to connect the switching contacts 14 and 15 to the terminals 14a and 15a. As a result, the
center sound of the amplifier 2 is output from the built-in speakers 1A and 1B. When an input
signal of a predetermined voltage or more is not input to the center speaker input terminal 7, the
DET circuit 17 does not detect the input signal and does not output a detection signal, the LATCH
circuit 18 does not operate, and the coil 16 of the relay 11 is By driving, the switching contacts
14 and 15 are connected to the terminals 14 b and 15 b. Thus, television sound is output from
the built-in speakers 1A and 1B.
[0023]
In addition, when the mode of the television receiver 1 is switched (TV, VIDEO1, VIDEO2, etc.),
regardless of the selection of the operation mode of the center speaker, the television audio
which is the normal audio is restored.
[0024]
Therefore, when the operation mode of the center speaker is selected as "automatic", when an
input signal of a predetermined voltage or more is inputted to the center speaker input terminal
7, the relay 11 is automatically switched to the center speaker input, Further, when an input
signal of a predetermined voltage or more is not inputted to the center speaker input terminal 7,
the relay 11 is automatically switched to the television sound input. Therefore, there is no need
to manually switch the changeover switch, and the operation is extremely easy.
[0025]
Further, since the detection signal is held for a fixed time by the LATCH circuit 18, when the
input signal from the amplifier 2 becomes lower than a predetermined voltage, it is possible to
prevent the relay 11 from being switched to the television sound input immediately. Can.
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[0026]
Further, as a detection method for switching to the center speaker input, there are the following
detection methods in addition to the method of detecting the voltage as described above.
(1)For example, a DC voltage is superimposed on the analog signal as a control signal, and when
it is detected that the DC voltage is superimposed, the input is switched to the center speaker
input.
(2)In addition to the analog signal, a control signal line is provided, and when it is detected that
the control signal is supplied through this control signal line, switching is made to the center
speaker input.
(3)The signal input method is an infrared communication method, and when the signal of this
infrared communication is received, the input is switched to the center speaker input. (4)A power
supply output for an external device is prepared in the television receiver, and in a state where
the external device is connected to the external device power output, switching to a center
speaker input is made if there is an output current of a predetermined power or more from the
external device power output.
[0027]
In the above embodiment, although a common television receiver is used, the present invention is
of course not limited to this and may be a projection television receiver. Moreover, although the
center speaker input terminal was provided in the television receiver, it is needless to say that it
may be a mere audio input terminal without being limited to this. Although the Dolby Surround
system is used, the present invention is not limited to this, and any system using a center speaker
may be used.
[0028]
As described above, according to the present invention, when the input signal is detected by the
voice input detection means, the television receiver can automatically receive the input signal
from the external device by the switching means. When the voice input detection means does not
detect the input signal, the switching means automatically outputs the television sound signal to
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the speaker, so there is no need to manually switch the switching means, and the operation is It
is extremely easy and can improve the operability.
[0029]
Further, since the detection of the input signal of the voice input detection means uses the input
signal voltage, no special detection means is required, and the detection of the input signal is
easy and reliable.
[0030]
Further, when the input signal is detected by the signal detection circuit and the detection signal
is output when there is an input signal, the detection signal is held by the signal hold circuit for a
certain period of time, so the input to the audio input terminal If no signal is detected, it is
possible to prevent the switching means from being switched to television audio input
immediately.
[0031]
Brief description of the drawings
[0032]
1 is a block diagram of a system using a television receiver with a center speaker input according
to the present invention.
[0033]
2 is a circuit diagram of a center speaker input automatic switching device in the television
receiver according to the present invention.
[0034]
3 is a block diagram of the signal detection circuit.
[0035]
4 is a block diagram showing the audio signal processing circuit of the amplifier.
[0036]
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5 is a block diagram of a system using a conventional television receiver with a center speaker
input.
[0037]
Explanation of sign
[0038]
DESCRIPTION OF SYMBOLS 1 ... TV receiver, 1A, 1B ... Built-in speaker, 2 ... Amplifier (external
apparatus), 3A, 3B ... Front speaker, 5A, 5B ... Rear speaker, 7 ... Center Speaker input terminal 8:
Center speaker input automatic switching device 9: Television audio circuit 10A, 10B: internal
amplifier 11: relay (switching means) 12: microcontroller 13 ... Signal detection circuit path
(center speaker input detection means) 14, 15 ... Switching contacts, 16 ... Coil, 17 ... DET circuit,
18 ... LATCH circuit
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