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JP2006279537

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2006279537
An object of the present invention is to make it possible to effectively use, for example, a 5channel power amplifier of an AV amplifier apparatus. A first amplifier 4FL for driving a speaker
7FL, a second amplifier 4FR for driving a speaker 7FR, a third amplifier 4RL for driving a speaker
7RL, and a fourth amplifier 4RR for driving a speaker 7RR. And the first changeover switch 13 on
the input side of the third amplifier 4RL, the second changeover switch 14 on the input side of
the fourth amplifier 4, and the third changeover switch 15. And the fourth changeover switch 16
so that, when a 2-channel audio signal is input, the front left speaker and the front right speaker
are BTL driven. [Selected figure] Figure 1
Voice output device
[0001]
The present invention relates to an audio output device suitable for application to an AV (audio
visual) amplifier device having, for example, five channels of power amplifiers constituting a
home theater system.
[0002]
Conventionally, as shown in FIG. 10, for example, an AV amplifier apparatus having a power
amplifier for five channels constituting a home theater system has been proposed (see Patent
Document 1).
[0003]
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1
Referring to FIG. 10, in the conventional AV amplifier apparatus shown in FIG. 10, 1D is supplied
with digital audio signals of 5 channels of reproduced signals of DVD (digital versatile disc) or 2
channels of compact disc (CD). These digital audio signal input terminals are supplied, and the
digital audio signal supplied to the digital audio signal input terminal 1D is supplied to a DSP
(digital signal processor) 2 constituting a demodulation circuit.
In the demodulation circuit 2 composed of this DSP, on the output side of the demodulation
circuit 2, the front left audio signal FL, the front right audio signal FR, the rear left audio signal
RL, the rear right audio signal RR and the front center audio signal C of 5 channels It is done to
get
[0004]
The front left audio signal FL obtained at the output side of the demodulation circuit 2 is
supplied to the front left power amplifier 4FL via a DA conversion circuit 3FL that converts a
digital signal into an analog signal, and the output of the power amplifier 4FL A signal is supplied
to the front left speaker 7FL composed of the tweeter 7FLT and the woofer 7FLW through the
speaker terminal 5FL and the terminal of the short circuit plate 6L.
[0005]
The front right audio signal FR obtained at the output side of the demodulation circuit 2 is
supplied to the front right power amplifier 4FR through the DA conversion circuit 3FR for
converting a digital signal into an analog signal, and the output of the power amplifier 4FR A
signal is supplied to the front right speaker 7FR composed of the tweeter 7FRT and the woofer
7FRW through the speaker terminal 5FR and the terminal of the short circuit plate 6R.
[0006]
The rear left audio signal RL obtained at the output side of the demodulation circuit 2 is supplied
to the rear left power amplifier 4RL via a DA conversion circuit 3RL that converts a digital signal
into an analog signal, and the output of the power amplifier 4RL A signal is supplied to the rear
left speaker 7RL via the speaker terminal 5RL.
[0007]
The rear right audio signal RR obtained on the output side of the demodulation circuit 2 is
supplied to the rear right power amplifier 4RR via the DA conversion circuit 3RR for converting a
digital signal into an analog signal, and the output of the power amplifier 4RR A signal is
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supplied to the rear right speaker 7RR via the speaker terminal 5RR.
[0008]
The front center audio signal C obtained on the output side of the demodulation circuit 2 is
supplied to the front center power amplifier 4C through the DA conversion circuit 3C for
converting a digital signal into an analog signal, and the output of the power amplifier 4C A
signal is supplied to the front center speaker 7C through the speaker terminal 5C.
[0009]
Further, in the conventional AV amplifier device shown in FIG. 10, the respective output sides of
the front left power amplifier 4FL and the front right power amplifier 4FR are connected through
the connection switches 8L and 8R to the front left speaker terminal 9FL and It is connected to
the front right speaker terminal 9FR so that other front left speakers and front right speakers can
be connected.
[0010]
In FIG. 10, although not shown, the negative sides of the speaker terminals 5FL, 5FR, 5RL, 5RR,
5C, 9FL, 9FR are all grounded in the amplifier.
[0011]
Further, 1AL and 1AR indicate an analog left audio signal input terminal and an analog right
audio signal input terminal to which analog left audio signal and right audio signal are supplied,
and the analog left audio signal input terminal 1AL and analog right audio signal input terminal
The analog left audio signal and the right audio signal supplied to 1AR are supplied to respective
input sides of the front left power amplifier 4FL and the front right power amplifier 4FR.
[0012]
In such a conventional AV amplifier as shown in FIG. 10, when an analog left audio signal and a
right audio signal are supplied to the analog left audio signal input terminal 1AL and the analog
right audio signal input terminal 1AR, respectively, the front left side It can be supplied to the
front left speaker 7FL and the front right speaker 7FR via the power amplifier 4FL for the front
right and the power amplifier 4FR for the front right, so that stereo sound can be enjoyed.
[0013]
In addition, when digital reproduction signal of digital 5 channels such as DVD is supplied to the
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digital audio signal input terminal 1D, the front left audio signal FL, the front right audio signal
FR, the rear left audio on the output side of the demodulation circuit 2 The signal RL, the rear
right audio signal RR and the front center audio signal C are obtained, and the front left audio
signal FL, the front right audio signal FR, the rear left audio signal RL, the rear right audio signal
obtained at the output side of the demodulation circuit 2 Front left audio signal FL, front right
audio signal FR, rear left audio signal RL, rear right audio signal analog of RR and front center
audio signal C through DA conversion circuits 3FL, 3FR, 3RL, 3RR and 3C, respectively RR and
the front center audio signal C are obtained, and these are fed to the front left speaker 7FL, front
through the power amplifiers 4FL, 4FR, 4RL, 4RR and 4C. Right speaker 7FR, rear left speaker
7RL, fed to the rear right speaker 7RR and front center speaker 7C, it is possible to enjoy audio
5-channel home theater.
[0014]
Further, when digital reproduction signals of two channels such as CD are supplied to the digital
audio signal input terminal 1D, the front left audio signal FL and the front right audio signal FR
are obtained at the output side of the demodulation circuit 2, The front left audio signal FL and
the front right audio signal FR obtained at the output side of the demodulation circuit 2 are
respectively obtained through the DA conversion circuits 3FL and 3FR to obtain an analog front
left audio signal FL and a front right audio signal FR. These can be supplied to the front left
speaker 7FL and the front right speaker 7FR via the power amplifiers 4FL and 4FR to enjoy
stereo sound.
JP 2004-159037 A
[0015]
As described above, the AV amplifier apparatus incorporates, for example, five channels of power
amplifiers 4FL, 4FR, 4RL, 4RR and 4C, and each of the power amplifiers 4FL, 4FR, 4RL, 4RR and
4C is independent for each signal. ing.
For this reason, if there are five channels of signals input to the AV amplifier apparatus, all five
channels of the power amplifiers 4FL, 4FR, 4RL, 4RR and 4C function.
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4
[0016]
However, when the input signal is a 2-channel analog audio signal or a 2-channel digital audio
signal, the 2-channel power amplifier functions among the 5-channel power amplifiers 4FL, 4FR,
4RL, 4RR and 4C. Only the amplifiers 4FL and 4FR have the disadvantage that the remaining
three channels of the power amplifiers 4RL, 4RR and 4C are in the function stop state.
[0017]
An object of the present invention is to make it possible to effectively use, for example, a 5channel power amplifier of the above-described AV amplifier device.
[0018]
The audio output apparatus according to the present invention drives a first amplifier for driving
a front left speaker disposed on the front left, a second amplifier for driving a front right speaker
disposed on the front right, and a rear left speaker disposed on the rear left An audio output
device having a third amplifier for driving and a fourth amplifier for driving a rear right speaker
disposed on the rear right side, the rear left audio signal being supplied to the input side of the
third amplifier or the front left audio A first switch for switching whether to supply an inverted
signal of the signal and a second switch for switching whether to supply a rear right audio signal
or an inverted signal of a front right audio signal to the input side of the fourth amplifier And
third to switch whether the output signal of the third amplifier is supplied to the rear left speaker
or to the front left speaker. A selector switch and a fourth selector switch for switching whether
the output signal of the fourth amplifier is supplied to the rear right speaker or the front right
speaker are provided, and a 2-channel audio signal is input to the front left when it is input The
speaker and this front right speaker are BTL driven.
[0019]
According to the present invention, when a two-channel audio signal is input, the third and
fourth amplifiers are used to BTL drive the front left speaker and the front right speaker.
Therefore, for the front left speaker and the front right speaker, The driving ability is quadrupled
theoretically, the S / N feeling is improved, and the dynamism of the sound is enhanced.
For example, the output of a power amplifier obtained by BTL driving a 100 W power amplifier is
400 W.
09-05-2019
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[0020]
Further, the audio output apparatus according to the present invention comprises a first
amplifier for driving a front left speaker consisting of a tweeter and a woofer arranged on the
front left, and a second driving a front right speaker consisting of a tweeter and a woofer
arranged on the front right. An audio output device comprising an amplifier, a third amplifier for
driving a rear left speaker disposed on the rear left, and a fourth amplifier for driving a rear right
speaker disposed on the rear right, the input of the third amplifier A first switch to switch
whether to supply the rear left audio signal or the front left audio signal to the side, and supply
the rear right audio signal to the input side of the fourth amplifier or the front right audio signal
And a second changeover switch for switching the output signal of the third amplifier to the rear
left speaker. A third selector switch that switches whether the signal is supplied to the front left
speaker or a fourth switch that switches whether the output signal of the fourth amplifier is
supplied to the rear right speaker or the front right speaker The front left speaker and the front
right speaker are bi-amplifier driven when a 2-channel audio signal is input.
[0021]
According to the present invention, when the two-channel audio signal is input, the third and
fourth amplifiers are used to drive the front left speaker and the front right speaker by biamplifier (parallel drive). Since the power input to the front right speaker is doubled overall and
the woofer and tweeter are driven by completely independent power amplifiers, it is possible to
reduce intermodulation distortion.
[0022]
According to the present invention, the third and fourth amplifiers can be effectively used when a
two-channel audio signal is input.
[0023]
Hereinafter, with reference to the drawings, an example of the best mode for carrying out the
voice output apparatus of the present invention will be described.
FIG. 1 shows an example in which both the bi-amplifier drive and the BTL drive can be switched.
In the description of the present example, in FIGS. 1 to 9, the parts corresponding to FIG.
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6
[0024]
Referring to FIG. 1 as an example, in FIG. 1, 1D is a digital audio signal input to which digital
audio signals of 5 channels of reproduction signals of DVD (digital versatile disc) or 2 channels of
CD (compact disc) are supplied. The terminal is shown, and the digital audio signal supplied to
the digital audio signal input terminal 1D is supplied to a DSP (digital signal processor) 2
constituting a demodulation circuit.
In the demodulation circuit 2 composed of this DSP, on the output side of the demodulation
circuit 2, the front left audio signal FL, the front right audio signal FR, the rear left audio signal
RL, the rear right audio signal RR and the front center audio signal C of 5 channels As you get
[0025]
Power for the front left side through a DA conversion circuit 3FL which converts a front left
audio signal FL obtained at the output side of the demodulation circuit 2 into an analog signal
and a connection switch 10L which is turned off when the analog audio signal is input. The signal
is supplied to the amplifier 4FL, and the output signal of the power amplifier 4FL is supplied to
the front left speaker 7FL including the tweeter 7FLT and the woofer 7FLW through the speaker
terminal 5FL and the terminal of the short circuit plate 6L.
[0026]
Power for the front right via a DA conversion circuit 3FR for converting a digital signal into an
analog signal and a connection switch 10R which is turned off when an analog audio signal is
input. The signal is supplied to the amplifier 4FR, and the output signal of the power amplifier
4FR is supplied to the front right speaker 7FR including the tweeter 7FRT and the woofer 7FRW
through the speaker terminal 5FR and the terminal of the short circuit plate 6R.
[0027]
Further, the input side of the power amplifier 4FL is connected to one fixed contact 13a of the
changeover switch 13 via the parallel circuit of the connection switch 11L and the inverter
circuit 12L constituting the phase inversion circuit, and the input side of the power amplifier 4FR
is It is connected to one fixed contact 14 a of the changeover switch 14 via a parallel circuit of
the connection switch 11 R and the inverter circuit 12 R constituting the phase inversion circuit.
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7
The connection switches 11L and 11R are turned on at the time of bi-amplifier driving at the
time of 2-channel audio signal input as described later.
[0028]
The rear left audio signal RL obtained on the output side of the demodulation circuit 2 is
supplied to the other fixed contact 13b of the changeover switch 13 via a D / A conversion
circuit 3RL which converts a digital signal into an analog signal.
A signal obtained at the movable contact 13c of the changeover switch 13 is supplied to the
power amplifier 4RL for the rear left side, and an output signal of the power amplifier 4RL is
supplied to the movable contact 15c of the changeover switch 15. A signal obtained at the fixed
contact 15b is supplied to the rear left speaker 7RL via the speaker terminal 5RL.
Further, a signal obtained at one fixed contact 15a of the changeover switch 15 is supplied to the
front left speaker 7FL via the speaker terminal 9FL and the terminal of the short circuit plate 6L.
[0029]
The rear right audio signal RR obtained on the output side of the demodulation circuit 2 is
supplied to the other fixed contact 14b of the changeover switch 14 via a DA conversion circuit
3RR for converting a digital signal into an analog signal.
A signal obtained at the movable contact 14c of the changeover switch 14 is supplied to the
power amplifier 4RR for the rear right side, and an output signal of the power amplifier 4RR is
supplied to the movable contact 16c of the changeover switch 16. A signal obtained at the fixed
contact 16b is supplied to the rear right speaker 7RR via the speaker terminal 5RR.
Also, a signal obtained at one fixed contact 16a of the changeover switch 16 is supplied to the
front left speaker 7FR via the speaker terminal 9FR and the terminals of the short circuit plate
6R.
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[0030]
The front center audio signal C obtained on the output side of the demodulation circuit 2 is
supplied to the front center power amplifier 4C through the DA conversion circuit 3C for
converting a digital signal into an analog signal, and the output of the power amplifier 4C A
signal is supplied to the front center speaker 7C through the speaker terminal 5C.
[0031]
Further, in this example, the respective output sides of the front left power amplifier 4FL and the
front right power amplifier 4FR are connected to the first fixed contacts 17a and 18a of the
three-point changeover switches 17 and 18, respectively. The second fixed contacts 17b and 18b
of the three-point changeover switches 17 and 18 are grounded, and the third fixed contacts 17d
and 18d of the three-point changeover switches 17 and 18 are floated. The movable contacts
17c and 18c of the three-point changeover switches 17 and 18 are connected to the speaker
terminals 9FL and 9FR, respectively.
[0032]
In FIG. 1, although not shown, the negative sides of the speaker terminals 5FL, 5FR, 5RL, 5RR,
5C, 9FL, 9FR are all grounded in the amplifier.
[0033]
Further, in FIG. 1, 1AL and 1AR indicate analog left audio signal input terminals and analog right
audio signal input terminals to which analog left audio signals and right audio signals are
supplied, and the analog left audio signal input terminals 1AL and analog right The analog left
audio signal and the right audio signal supplied to the audio signal input terminal 1AR are
supplied to the input sides of the front left power amplifier 4FL and the front right power
amplifier 4FR, respectively.
[0034]
Further, in this example, the connection switches 10L and 10R, the changeover switches 13, 14,
15 and 16 and the like are controlled by the microcomputer 19 as described later.
[0035]
Next, with reference to FIG. 2 to FIG. 5, a case where the front left speaker 7FL and the front
right speaker 7FR are driven by BTL (Bridged Transformer Less) when the 2-channel audio signal
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9
is input will be described.
[0036]
In this case, as shown in FIG. 2, the two positive terminals of the shorting plate 6L are shorted to
each other and the two negative terminals are shorted to each other, and the positive terminal +
constitutes a front left speaker 7FL. The negative terminal-is connected to the negative terminalof each of the tweeter 7FLT and the woofer 7FLW.
The positive terminal + of the speaker terminal 5FL is connected to the positive terminal + of the
short circuit plate 6L, and the positive terminal + of the speaker terminal 9FL is connected to the
negative terminal − of the short circuit plate 6L. The negative terminals of the speaker terminals
5FL and 9FL Ground the terminal-.
[0037]
In this case, as shown in FIG. 2, the two positive terminals of the shorting plate 6R are shorted to
each other and the two negative terminals are shorted to each other, and the positive terminal +
constitutes a front right speaker 7FR. The negative terminal-is connected to the negative
terminal-of each of the tweeter 7FLT and the woofer 7FRW.
Further, the positive terminal + of the speaker terminal 5FR is connected to the positive terminal
+ of the shorting plate 6R, and the positive terminal + of the speaker terminal 9FR is connected to
the negative terminal-of the shorting plate 6R. The negative terminals of the speaker terminals
5FR and 9FR Ground the terminal-.
[0038]
In this case, when the analog left audio signal and the right audio signal are supplied to the
analog left audio signal input terminal 1AL and the analog right audio signal input terminal 1AR,
as shown in FIG. 3, the connection switches 10L, 10R, 11L and 11R is turned off, and the
movable contacts 13c, 14c, 15c and 16c of the changeover switches 13, 14, 15 and 16 are
connected to one fixed contact 13a, 14a, 15a and 16a, respectively, The eighteen movable
contacts 17c and 18c are connected to the third fixed contacts 17d and 18d in a floating state.
09-05-2019
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[0039]
At this time, the left audio signal supplied to the analog left audio signal input terminal 1AL is
supplied to the positive terminal + of the short circuit plate 6L through the power amplifier 4FL
and the speaker terminal 5FL, and this left audio signal is for phase inversion. The negative
terminal of the short-circuit plate 6L is supplied through the inverter circuit 12L, the power
amplifier 4RL for the rear left side, and the speaker terminal 9FL, and the tweeter 7FLT and the
woofer 7FLW constituting the front left side speaker 7FL are BTL driven.
[0040]
Also, at this time, the right audio signal supplied to the analog right audio signal input terminal
1AR is supplied to the positive terminal + of the shorting plate 6R through the power amplifier
4FR and the speaker terminal 5FR, and this right audio signal is anti-phased. The negative
terminal of the short-circuit plate 6R is supplied through the diverting inverter circuit 12R, the
rear right power amplifier 4RR, and the speaker terminal 9FR to BTL drive the tweeter 7FRT and
the woofer 7FRW that constitute the front right speaker 7FR.
[0041]
According to this embodiment, when the left and right audio signals of two channels are input,
the front left speaker 7FL and the front right speaker 7FR are BTL driven using the rear left
power amplifier 4RL and the rear right power amplifier 4RR. Since the driving ability for the
front left speaker 7FL and the front right speaker 7FR is theoretically quadrupled, the sense of S
/ N is improved and the dynamism of the sound is enhanced.
For example, the output of a power amplifier obtained by BTL driving a 100 W power amplifier is
400 W.
[0042]
Therefore, according to this embodiment, the rear left power amplifier 4RL and the rear right
power amplifier 4RR can be effectively used when inputting the two channels of analog left audio
signal and right audio signal.
[0043]
Next, in this case, when a 5-channel digital audio signal of DVD is supplied to the digital audio
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signal input terminal 1D, the connection switches 10L and 10R are turned on and the connection
switches 11L and 11R are turned off as shown in FIG. The movable contacts 13c, 14c, 15c and
16c of the changeover switches 13, 14, 15 and 16 are respectively connected to the other fixed
contacts 13b, 14b, 15b and 16b, and the movable contacts 17c of the three-point changeover
switches 17 and 18 are connected. And 18c are connected to the second fixed contacts 17b and
18b, and the respective positive terminals + of the speaker terminals 9FL and 9FR are grounded.
[0044]
At this time, the front left audio signal FL, the front right audio signal FR, the rear left audio
signal RL, the rear right audio signal RR and the front central audio signal C are obtained at the
output side of the demodulation circuit 2. The front left audio signal FL, the front right audio
signal FR, the rear left audio signal RL, the rear right audio signal RR and the front center audio
signal C obtained at the output side are respectively D-A conversion circuits 3FL, 3FR, 3RL, 3RR
and 3C. To obtain an analog front left audio signal FL, a front right audio signal FR, a rear left
audio signal RL, a rear right audio signal RR, and a front center audio signal C, which are divided
into power amplifiers 4FL, 4FR, 4RL, 4RR and 4C, the front left speaker 7FL, the front right
speaker 7FR, the rear left speaker 7RL, the rear right speaker 7RR, and the front center speaker
7C Supplied, it is possible to enjoy the voice of the 5-channel home theater.
[0045]
In addition, when the digital audio signal input terminal 1D is supplied with, for example, digital
2-channel reproduction signals such as CD, as shown in FIG. 5, the connection switches 10L and
10R are turned on and the connection switches 11L and 11R are turned off. The movable
contacts 13c, 14c, 15c and 16c of the changeover switches 13, 14, 15 and 16 are respectively
connected to one fixed contact 13a, 14a, 15a and 16a, and the movable contacts 17c of the
three-point changeover switches 17 and 18 are connected. And 18c to the third fixed contacts
17d and 18d.
[0046]
At this time, digital audio signals of two channels of the front left audio signal FL and the front
right audio signal FR are obtained at the output side of the demodulation circuit 2, and the front
left audio signal FL is a D / A conversion circuit 3FL, a power amplifier The front left audio signal
FL supplied to the positive terminal + of the short circuit plate 6L via the 4FL and the speaker
terminal 5FL and converted into an analog signal by the D-A conversion circuit 3FL is an inverter
circuit 12L for phase inversion, rear left The negative terminal of the short circuit plate 6L is
supplied through the power amplifier 4RL and the speaker terminal 9FL for the BTL drive of the
tweeter 7FLT and the woofer 7FLW that constitute the front left speaker 7FL.
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[0047]
At this time, the front right audio signal FR obtained on the output side of the demodulation
circuit 2 is supplied to the positive terminal + of the short circuit plate 6R through the D-A
conversion circuit 3FR, the power amplifier 4FR and the speaker terminal 5FR. The front right
audio signal FR converted to an analog signal by the D-A conversion circuit 3FR is phase-inverted
inverter circuit 12R, the rear right-hand power amplifier 4RR and the negative terminal of the
shorting plate 6R through the speaker terminal 9FR. And BTL drive the tweeter 7 FRT and the
woofer 7 FRW that constitute the front right speaker 7 FR.
[0048]
According to this embodiment, the front left speaker 7FL and the front right speaker 7FR are BTL
driven using the rear left power amplifier 4RL and the rear right power amplifier 4RR when
inputting 2-channel digital audio signals. Therefore, the driving ability for the front left speaker
7FL and the front right speaker 7FR is quadrupled in theory, the S / N feeling is improved, and
the dynamism of the sound is enhanced.
For example, the output of a power amplifier obtained by BTL driving a 100 W power amplifier is
400 W.
[0049]
Therefore, according to the present embodiment, the rear left power amplifier 4RL and the rear
right power amplifier 4RR can be effectively used when inputting digital audio signals of two
channels.
[0050]
When two-channel audio signals are input and only the front left speaker 7FL and the front right
speaker 7FR are driven by BTL, the connection switches 11L and 11R in FIG. 1 and the threepoint changeover switches 17 and 18 shown in FIG. The first fixed contacts 17a and 18a and the
like are unnecessary.
[0051]
Next, with reference to FIGS. 6 to 9, the case of bi-amplifier driving (parallel driving) of the front
left speaker 7FL and the front right speaker 7FR when a 2-channel audio signal is input will be
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described with reference to FIG.
[0052]
In this case, as shown in FIG. 6, the positive terminal + and the negative terminal − of the
speaker terminal 5FL are connected to the positive terminal + and the negative terminal of the
woofer 7FLW constituting the front left speaker 7FL, and the positive terminal + and the negative
terminal of the speaker terminal 9FL are The negative terminal-is connected to the positive
terminal + and the negative terminal-of the tweeter 7FLT constituting the front left speaker 7FL.
[0053]
Further, as shown in FIG. 6, the positive terminal + and the negative terminal-of the speaker
terminal 5FR are connected to the positive terminal + and the negative terminal of the woofer
7FRW constituting the front right speaker 7FR, and the positive terminal + and the negative
terminal of the speaker terminal 9FR The terminal-is connected to the positive terminal + and the
negative terminal-of the tweeter 7FRT that constitutes the front left speaker 7FR.
[0054]
Also, the negative terminals-of the speaker terminals 5FL, 5FR, 9FL and 9FR are grounded.
[0055]
In this case, when the analog left audio signal and the right audio signal are supplied to the
analog left audio signal input terminal 1AL and the analog right audio signal input terminal 1AR,
as shown in FIG. 7, the connection switches 10L and 10R are turned off. The connection switches
11L and 11R are turned on, and the movable contacts 13c, 14c, 15c and 16c of the changeover
switches 13, 14, 15 and 16 are connected to one fixed contact 13a, 14a, 15a and 16a,
respectively. The movable contacts 17c and 18c of the three-point changeover switches 17 and
18 are connected to the third fixed contacts 17d and 18d in a floating state.
[0056]
At this time, the left audio signal supplied to the analog left audio signal input terminal 1AL is
supplied to the positive terminal + of the woofer 7FLW via the power amplifier 4FL and the
positive terminal + of the speaker terminal 5FL, and the left audio signal is connected. It is
supplied to the positive terminal + of the tweeter 7FLT via the switch 11L, the power amplifier
4RL for the rear left side and the positive terminal + of the speaker terminal 9FL, the negative
terminal − of the tweeter 7FRT and the woofer 7FRW is grounded, and the front left speaker
7FL is The tweeter 7FLT and the woofer 7FLW to be configured are bi-amplifier driven.
09-05-2019
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[0057]
Also, at this time, the right audio signal supplied to the analog right audio signal input terminal
1AR is supplied to the positive terminal + of the woofer 7FRW through the power amplifier 4FR
and the positive terminal + of the speaker terminal 5FR and this right audio signal Are supplied
to the positive terminal + of the tweeter 7FRT through the connection switch 11R, the power
amplifier 4RR for the rear right, and the positive terminal + of the speaker terminal 9FR, and the
negative terminals-of the tweeter 7FRT and the woofer 7FRW are grounded respectively, and the
front right speaker The tweeter 7FRT and the woofer 7FRW constituting the 7FR are bi-amplifier
driven.
[0058]
According to this embodiment, when the left and right audio signals of two channels are input,
the front left speaker 7FL and the front right speaker 7FR are bi-amplifier driven using the rear
left power amplifier 4RL and the rear right power amplifier 4RR. Because the power input to the
front left speaker 7FL and the front right speaker 7FR is doubled in total, the woofers 7FLW and
7FRW and the tweeters 7FLT and 7FRT are driven by separate power amplifiers completely
independent of each other. Therefore, the intermodulation distortion can be reduced.
[0059]
Therefore, according to this embodiment, the rear left power amplifier 4RL and the rear right
power amplifier 4RR can be effectively used when inputting the two channels of analog left audio
signal and right audio signal.
[0060]
Next, in this case, when a 5-channel digital audio signal of DVD is supplied to the digital audio
signal input terminal 1D, the connection switches 10L and 10R are turned on and the connection
switches 11L and 11R are turned off as shown in FIG. The movable contacts 13c, 14c, 15c and
16c of the changeover switches 13, 14, 15 and 16 are respectively connected to the other fixed
contacts 13b, 14b, 15b and 16b, and the movable contacts 17c of the three-point changeover
switches 17 and 18 are connected. And 18c are connected to the first fixed contacts 17a and
18a.
[0061]
At this time, the front left audio signal FL, the front right audio signal FR, the rear left audio
signal RL, the rear right audio signal RR and the front central audio signal C are obtained at the
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output side of the demodulation circuit 2. The front left audio signal FL, the front right audio
signal FR, the rear left audio signal RL, the rear right audio signal RR and the front center audio
signal C obtained at the output side are respectively D-A conversion circuits 3FL, 3FR, 3RL, 3RR
and 3C. To obtain an analog front left audio signal FL, a front right audio signal FR, a rear left
audio signal RL, a rear right audio signal RR, and a front center audio signal C, which are divided
into power amplifiers 4FL, 4FR, 4RL, 4RR and Supply to 4C.
[0062]
In this example, the output signal of the power amplifier 4FL is supplied to the woofer 7FLW
constituting the front left speaker 7FL via the speaker terminal 5FL, and the output signal of the
power amplifier 4FL is supplied to the front left speaker 7FL via the speaker terminal 9FL. The
tweeter 7FLT to be configured is supplied, and the output signal of the power amplifier 4FR is
supplied to the woofer 7FRW constituting the front right speaker 7FR through the speaker
terminal 5FR, and the output signal of the power amplifier 4FR is connected to the front left
through the speaker terminal 9FR The speaker 7FR is supplied to the tweeter 7FRT, and the
output signals of the power amplifiers 4RL, 4RR and 4c are supplied to the rear left speaker 7RL,
the rear right speaker 7RR and the front center speaker 7C, so that the audio can be enjoyed in
the 5-channel home theater Mukoto can.
[0063]
In addition, when the digital audio signal input terminal 1D is supplied with, for example, digital
2-channel reproduction signals such as CD, as shown in FIG. 5, the connection switches 10L and
10R are turned on and the connection switches 11L and 11R are turned off. The movable
contacts 13c, 14c, 15c and 16c of the changeover switches 13, 14, 15 and 16 are respectively
connected to one fixed contact 13a, 14a, 15a and 16a, and the movable contacts 17c of the
three-point changeover switches 17 and 18 are connected. And 18c are connected to the third
fixed contacts 17d and 18d in the floating state.
[0064]
At this time, digital audio signals of two channels of the front left audio signal FL and the front
right audio signal FR are obtained at the output side of the demodulation circuit 2, and the front
left audio signal FL is a D / A conversion circuit 3FL, a power amplifier The front left audio signal
FL supplied to the positive terminal + of the woofer 7FLW via the 4FL and the positive terminal +
of the speaker terminal 5FL and converted into an analog signal by the D-A conversion circuit
3FL is a connection switch 11L for the rear right Is supplied to the positive terminal + of the
tweeter 7FLT through the positive terminal + of the power amplifier 4RL and the speaker
terminal 9FL, and the negative terminal − of the tweeter 7FRT and the woofer 7FRW are
grounded respectively to constitute the front left speaker 7FL Drive 7FLW by amplifier.
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[0065]
At this time, the front right audio signal FR obtained on the output side of the demodulation
circuit 2 is supplied to the positive terminal + of the woofer 7FRW via the D / A conversion
circuit 3FR, the power amplifier 4FR and the positive terminal + of the speaker terminal 5FR. Of
the front right audio signal FR converted into an analog signal by the D / A conversion circuit
3FR and the positive terminal of the tweeter 7FRT through the connection switch 11R, the power
amplifier 4RR for the rear right, and the positive terminal + of the speaker terminal 9FR. The
negative terminals of the tweeter 7FRT and the woofer 7FRW are respectively grounded and biamp drive the tweeter 7FRT and the woofer 7FRW that constitute the front right speaker 7FR.
[0066]
According to this embodiment, when the digital audio signal of 2 channels is input, the front left
speaker 7FL and the front right speaker 7FR are bi-amplifier driven using the rear left power
amplifier 4RL and the rear right power amplifier 4RR. Therefore, the power input to the front left
speaker 7FL and the front right speaker 7FR is doubled in total, and the woofers 7FLW and
7FRW and the tweeters 7FLT and 7FRT are driven by separate power amplifiers completely
independent of each other. Distortion can be reduced.
[0067]
Therefore, according to the present embodiment, the rear left power amplifier 4RL and the rear
right power amplifier 4RR can be effectively used when inputting digital audio signals of two
channels.
[0068]
In the example of FIG. 1, the front left speaker 7FL and the front right speaker 7FR can be BTL
driven and bi-amplifier driven when a two-channel audio signal is input. However, when only biamplifier driving is performed in this FIG. The inverter circuits 12L and 12R for phase inversion
of FIG. 1 and the second fixed contacts 17b and 18b of the three-point changeover switches 17
and 18 are unnecessary.
[0069]
Further, the present invention is not limited to the above-described example, and it goes without
saying that various other configurations can be adopted without departing from the scope of the
present invention.
09-05-2019
17
[0070]
It is a block diagram which shows the example of the best form for implementing this invention
audio | voice output apparatus.
It is a block diagram of the example of the principal part used for description of this invention.
FIG. 2 is a configuration diagram for describing FIG. 1;
FIG. 2 is a configuration diagram for describing FIG.
FIG. 2 is a configuration diagram for describing FIG. 1;
It is a block diagram of the example of the principal part used for description of this invention.
FIG. 2 is a configuration diagram for describing FIG. 1;
FIG. 2 is a configuration diagram for describing FIG. 1;
FIG. 2 is a configuration diagram for describing FIG. 1;
It is a block diagram which shows the example of the conventional AV amplifier apparatus.
Explanation of sign
[0071]
1AL, 1AR ... Analog voice signal input terminal, 1D ... Digital voice signal input terminal, 2 ...
Demodulation circuit, 3FL, 3FR, 3RL, 3RR, 3C ... Digital-analog conversion circuit, 4FL, 4FR, 4RL,
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4RR, 4C ... Power Amplifier, 5FL, 5FR, 5RL, 5RR, 5C, 9FL, 9FR ... Speaker terminal, 6L, 6R ... Short
circuit board, 7FL ... Front left speaker, 7FLT, 7FRT ... Tweeter, 7FLW, 7FRW ... Woofer, 7FR ...
Front right speaker, 10L, 10R, 11L, 11R ... connection switch, 12L, 12R ... inverter circuit, 13, 14,
15, 16 ... changeover switch, 17, 18 ... 3 point changeover switch, 19 ... microcomputer
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