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JP2003032800

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DESCRIPTION JP2003032800
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
television receiver and an audio reproduction apparatus, and in particular, automatically detects
connection of a speaker (loudspeaker) when reproducing multi-channel stereo sound. The
present invention relates to a technology that is effective when applied to a technology for
converting to a stereo system that is optimal for the number of speakers.
[0002]
2. Description of the Related Art Conventionally, when the stereo method of an audio program to
be reproduced is different from the number of speakers used, the user has conventionally
selected the conversion method built in an amplifier (width amplifier) etc. The For example, in
the case of listening to 5.1ch surround stereo with two speakers or four speakers without a
center speaker, it is necessary to perform parameter setting work of an amplifier in order to
downmix to each method.
[0003]
A conversion system built in the amplifier etc. is shown in FIG. When the 5-channel stereo signal
is reproduced only by the two left and right speakers, the switches 11, 12, and 13 are turned
upward in FIG. 2, and the C signal, LS signal, and RS signal are added to the L signal and R signal
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by the adder 14. to add.
[0004]
The L, R, C, LS, and RS respectively indicate position signals of the speakers 2a to 2e to be driven,
L (Left) is a left signal, R (Right) is a right signal, and C (center) is a center. A signal, LS (Left
Surround) is a left rear signal, and an RS (Right Surround) right rear signal.
[0005]
Further, in the case of reproduction by four speakers, in which only the center speaker is
omitted, the switches 12 and 13 are turned down only on the switch 11 to convert them into
four channel signals.
Normally, the switches 11, 12, 13 are controlled from switches on the front panel of the
amplifier or remote control. It is necessary for the user to operate the front panel switch and the
remote control by himself.
[0006]
SUMMARY OF THE INVENTION However, in the prior art, only the user knows the connection
state of the speaker, so the user also has to convert the stereo method by himself. . Therefore, it
is extremely difficult for users who are not familiar with the principle of stereophonic sound
reproduction. For example, in an extreme case, a user who listens with two speakers sometimes
listens to a 5-channel stereo in a state where the center or surround sound can not be heard.
[0007]
An object of the present invention is to provide a technology capable of detecting the connection
state of speakers and listening to an optimal stereo system in the number of speakers without the
user being aware of it. The above and other objects and novel features of the present invention
will become apparent from the description of the present specification and the accompanying
drawings.
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[0008]
The summary of the invention disclosed in the present application will be briefly described as
follows. The first invention relates to a speaker driving means for self-determining whether or
not a speaker is connected, a means for automatically changing the down-mix method from the
number of connected speakers and the system of multi-channel stereo audio to be reproduced. It
is a speaker connection circuit device comprising amplification means for performing
predetermined downmixing from the number of speakers and the multi-channel stereo audio
system to be reproduced and driving the speakers.
[0009]
According to a second aspect of the present invention, in the speaker connection circuit device
according to the first aspect, the speaker driving means detects a change in current or a change
in capacitance by a detector connected to an amplifier output, and outputs the output of the
amplifier It consists of a means to determine the presence or absence of the speaker connection
of the other.
[0010]
That is, a change in current or a change in capacity is detected by a detector connected to the
amplifier output, and it is determined whether there is a speaker connection to the output of the
amplifier.
The information is sent to the downmix circuit in front of the amplifier. The downmix circuit
performs predetermined system conversion from the information on the number and
arrangement of speakers and the information on the stereo system of the audio program to be
reproduced, and sends an output signal to the amplifier circuit.
[0011]
With this configuration, stereo format conversion is automatically performed when the stereo
format of the program and the speaker arrangement do not match, so the number of speakers
connected to the stereo format of the program by the user is taken into consideration. There is
no need to choose the stereo format conversion, and any type of stereo sound can be optimally
reproduced with the number of speakers.
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[0012]
Hereinafter, the present invention will be described in detail with reference to the drawings along
with embodiments according to the present invention.
[0013]
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing a
schematic configuration of a speaker connection circuit device according to an embodiment of
the present invention.
In this embodiment, as a typical example, the audio input unit is a 5-channel stereo.
[0014]
In FIG. 1, 1 is an audio signal and a speaker position signal input terminal, 2a to 2e are speakers
(a loudspeaker), 3 is a downmix circuit (system conversion circuit), 4 is an amplifier and 5 is a
speaker connection. Detection circuits 6a to 6e are amplifier input terminals.
L, R, C, LS, and RS of the audio signal and the speaker position signal input terminal 1 indicate
position signals of the speakers 2a to 2e to be driven, L (Left) is a left signal, and R (Right) is a
right signal. , C (center) is a center signal, LS (left surround) is a left rear signal, and RS (right
surround) right rear signal.
[0015]
In the speaker connection circuit device of this embodiment, as shown in FIG. 1, a system
conversion circuit (system conversion circuit) 3 is connected to the front stage of an amplifier
(amplifier) 4. Further, it is assumed that only the speaker 2a and the speaker 2b corresponding
to the left and right of the stereo among the speakers (loudspeakers) 2a to 2e are connected to
the subsequent stage of the amplifier (amplifier) 4.
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[0016]
The speaker connection detection circuit 5 operates with the turning on of the power to detect
which speaker is connected. The speaker connection detection circuit 5 inputs the detection
result to the downmix circuit 3. The downmix circuit 3 converts 5-channel stereo into 2-channel
stereo, and inputs it to the amplifier input terminals 6a and 6b among the amplifier input
terminals 6a to 6e.
[0017]
Hereinafter, specific configurations and operations of the downmix circuit 3 and the speaker
connection detection circuit 5 will be described. The configuration of the downmix circuit 3 of
the present embodiment is basically the same as the configuration of FIG. 2 described above.
However, the switches 11, 12 and 13 are not switched from the front panel or the remote
control, but the speakers 2a to 2e connected to the output terminal of the amplifier 4 are
detected by the speaker connection detection circuit 5, and the detection results are It is input to
the down mix circuit 3 and performed automatically.
[0018]
The speaker connection detection circuit 5 of this embodiment is a means for determining
whether or not the speakers 2a to 2e are connected to the output terminal of the amplifier 4. As
a method thereof, mechanical and electrical are used. There is something. The mechanical
method is determined from the positional relationship of the connector of the output terminal of
the amplifier 4 and is effective when the connector is a horn jack or the like. Electrical methods
take advantage of the generally low impedance of the loudspeaker (on the order of 8 ohms). A
weak voltage is applied to the output terminal of the amplifier 4, and a weak current flowing
through the speaker connection is detected to determine the connection of the speakers 2a to 2e.
Although there are various means other than these, the present invention does not limit the
means.
[0019]
Although the invention made by the inventor has been specifically described based on the above
embodiments, the present invention is not limited to the above embodiments, and various
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modifications can be made without departing from the scope of the invention Of course it is
possible.
[0020]
The effects obtained by the invention disclosed in the present application will be briefly
described as follows.
According to the present invention, when the stereo system of the program and the speaker
arrangement do not match, the stereo system conversion is automatically performed. Therefore,
the stereo system conversion in consideration of the number of speakers connected to the stereo
system of the program by the user The stereophonic sound of any system can be optimally
reproduced with the number of speakers.
[0021]
Brief description of the drawings
[0022]
1 is a block diagram showing a schematic configuration of a speaker connection circuit device
according to an embodiment of the present invention.
[0023]
2 is a diagram showing a configuration example of a conventional downmix circuit (scheme
conversion circuit).
[0024]
Explanation of sign
[0025]
DESCRIPTION OF SYMBOLS 1 ... Audio | voice signal and speaker position signal input terminal
2a-2e ... Speaker (loud-speaker) 3 ... Down mix circuit (method conversion circuit) 4 ... Amplifier
(amplifier) 5 ... Speaker connection detection circuit 6a-6e ... Amplifier input terminal L ... Left
signal R ... Right signal C ... Center signal LS ... Left back signal RS ... Right back signal
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