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JPH0819100

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DESCRIPTION JPH0819100
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
surround stereo used in an AV apparatus.
[0002]
2. Description of the Related Art FIG. 7 shows a block diagram of conventional surround stereo in
an AV apparatus. Also, a circuit diagram of this surround stereo is shown in FIG. This surround
stereo is disclosed in Japanese Patent Application Laid-Open No. 59-223100.
[0003]
The surround stereo shown in FIGS. 7 and 8 has a two-channel specification, but since each
channel is similar, only one channel will be described here. In the one-channel specification, only
the sound image in the direction to either the left or right of the listener can be controlled.
[0004]
In FIG. 7, the signal S0 inputted to the input terminal 1 is branched into two by the first two-
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branching means 21 and the first output signal is inputted to the first time delaying means 11
and delayed in time. It becomes signal S1. The delay time value by the first time delay means 11
is set to a value equal to the time difference between the speaker and the left and right ears of
the listener. The delay time value changes depending on the direction of the speaker. For
example, when the speaker is 30 degrees ahead, the delay time value is set to 280 μsec.
[0005]
The signal S1 outputted from the first time delay means 11 is branched into two by the second
two-branching means 22 and the first output signal thereof is inputted to the first equalizer
means 13 and equalized. It becomes S3. The frequency characteristics of the first equalizer
means 13 approximate the frequency characteristics of (crosstalk signal characteristics) / (main
signal characteristics) from the speaker to the left and right ears of the listener. FIG. 9 shows a
measurement result in the case where the speaker direction is 30 degrees ahead of the listener,
resulting in complex frequency characteristics.
[0006]
The second output signal of the second two-branching means 22 is input to the second time
delay means 12 to become a signal S2 delayed in time. The delay time value by the second time
delay means 12 is added to the delay time value by the first time delay means 11 so that the
speaker is placed in the lateral direction of the listener from the speaker to the left and right of
the listener Set the same value as the time difference to reach the ear. For example, when the
speaker direction is 90 degrees to the side of the listener, the delay time value is set to 550
microseconds.
[0007]
The signal S2 outputted from the second time delay means 12 becomes an equalized signal S4
inputted to the second equalizer means 14. The frequency characteristic by the second equalizer
means 14 approximates the frequency characteristic of (crosstalk signal characteristic) / (main
signal characteristic) from the speaker placed in the lateral direction of the listener to the left and
right ears of the listener . FIG. 10 shows the measurement results in the case where the speaker
direction is 90 degrees to the side of the listener, and the frequency characteristic is complicated
as in FIG.
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[0008]
The signal S3 outputted from the first equalizer means 13 is inputted to the first phase inverting
means 15 and becomes a signal S5 obtained by inverting the phase. The crosstalk signal from the
speaker to the listener's ear can be canceled or attenuated by the signal S5.
[0009]
The second output signal of the first two-branching means 21 is input to the first addition means
23 and added to form an output signal S10, which is output to the output terminal 2. The output
signal S5 of the first phase inverting means 15 and the output signal S4 of the second equalizer
means 14 are input to the adding means 24 and added to form an output signal S11 which is
output to the output terminal 3. When the output signals S10 and S11 are reproduced by two
speakers, the sound image is localized in the lateral direction to the right or left of the listener.
[0010]
The circuit diagram shown in FIG. 8 shows a case where a phase shifter (Phase Shifter)
configuration is formed by an OP amplifier as a time delay means, and a three-dimensional
reverberation space creation effect is obtained by inputting a reverberation sound. That is, it is
possible to provide an audio device having a surround effect.
[0011]
However, in the above-described conventional surround stereo, in order to obtain the abovedescribed three-dimensional reverberation space creation effect, that is, the surround effect, in
the AV apparatus, first of all, The sound image localization control circuit needs to have a twochannel specification, and secondly, the reverberation sounds input to the input terminals 1 and
30 need to be stereo signals that are mutually uncorrelated, The cost is increased and the input
signal is limited.
[0012]
In view of the above problems, the present invention can simplify the structure and reduce the
cost, and also by this simplified structure, it is possible to obtain a surround effect having a sense
of expansion without limiting the input signal. To provide surround stereo that can
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[0013]
SUMMARY OF THE INVENTION In order to solve the above problems, the surround stereo
according to the present invention has one output terminal, and two output terminals, a first
output terminal and a second output terminal. And surround the first and second time delay
means for delaying the signal, first and second equalizer means for equalizing the signal, and
first, second and second phase delay means for inverting the signal. , And adding means for
adding the signals, wherein a first signal of the signals input to the input terminal and divided
into two is input to the first time delay means, and A third signal of the two signals outputted
from the time delaying means of the second invention is inputted to the adding means via the
first equalizer means and the first phase inverting means, and the first time delaying means
Output from The fourth signal of the divided signals is input to the addition means via the second
time delay means and the second equalizer means, and the second one of the divided signals
input to the input terminal is selected. The second signal is input to the adding means via the
second phase inverting means, and the fifth signal of the two signals outputted from the adding
means is output to the first output terminal. A sixth signal of the signals outputted from the
adding means and divided into two is outputted to the second output terminal through the third
phase inverting means.
[0014]
According to the above configuration, the first and second time delay means make a time
difference until the signals from the speakers arranged in the lateral direction of the listener
reach the listener's left and right ears. .
A first equalizer means produces a frequency characteristic difference of each signal that extends
from the loudspeakers arranged laterally of the listener to the left and right ears of the listener.
The first phase inverting means, together with the first time delaying means and the first
equalizer means, cancels or attenuates the signal which is crosstalk of the signal from the
speaker to be reproduced to the left and right ears of the listener.
Based on these operations, the second phase inverting means produces pseudo stereo sound.
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[0015]
DETAILED DESCRIPTION OF THE INVENTION Surround stereo according to an embodiment of
the present invention will be described below with reference to the drawings.
[0016]
FIG. 1 shows a block diagram of surround stereo in this embodiment, and FIG. 2 shows a circuit
diagram in the case of a phase shifter configuration by an OP amplifier as the time delay means
shown in FIG. There is.
The same reference numerals will be appended to the same functions as in the conventional
example.
[0017]
1 and 2, the signal S0 inputted to the input terminal 1 is branched into two by the first twobranching means 21 and the first output signal is inputted to the first time delaying means 11.
Be done.
The delay time value by the first time delay means 11 is set to a value equal to the time
difference between the speaker and the left and right ears of the listener. The delay time value
changes depending on the direction of the speaker. For example, when the direction of the
speaker is 30 degrees ahead, the delay time value is set to 280 μsec.
[0018]
The output signal S1 of the first time delay means 11 is branched into two by the second twoway branching means 22, and the first output signal is inputted to the first equalizer means 13.
The frequency characteristic by the first equalizer means 13 is the difference in frequency
characteristic from the speaker to the left and right ears of the listener. This target frequency
characteristic is the same as the frequency characteristic shown in FIG.
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[0019]
The output signal S3 of the first equalizer means 13 is input to the first phase inverting means,
and the phase inverted signal S5 is output. The first phase inverting means, together with the
first time delaying means and the first equalizer means, cancels or attenuates the signal which is
crosstalk of the signal from the speaker to be reproduced to the left and right ears of the listener.
It is.
[0020]
The second output signal of the signals branched into two by the second branching means 22 is
input to the second time delaying means 12. The delay time value by the second time delay
means 12 is added to the time delay value by the first time delay means 11, and reaches the left
and right ears of the listener from the speaker arranged on the side of the listener Set the same
as the time difference.
[0021]
The output signal S2 of the second time delay means 12 is input to the second equalizer means
14 to output a signal S4. The frequency characteristic by the second equalizer means 14 is the
difference in frequency characteristic from the speaker arranged on the side of the listener to the
left and right ears of the listener. This target frequency characteristic is the same as the
frequency characteristic shown in FIG.
[0022]
Of the signals branched into two by the first two-branching means 21, the second output signal is
inputted to the second phase inverting means 16 and outputs the phase-inverted signal S6. The
function of the second phase inversion means 16 is a function of sign inversion necessary to
make the configuration monaural, which will be described in detail later.
[0023]
The signal S5 input to the first phase inverting means 15 and inverted in phase, the signal S4
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input to the second equalizer means 14 and equalized, and input to the second phase inverting
means 16 and inverted in phase The signal S6 is input to the addition means 23 and the added
signal S7 is output.
[0024]
This signal S 7 is branched into two by the third two-branching means 25, and the first output
signal is outputted from the first output terminal 2.
The second output signal of the signals branched into two by the third two-branching means 25
is inputted to the third phase inverting means 17 and outputs a signal S8 which is phaseinverted. The function of the third phase inverting means 17 is a function of converting a
monaural signal into a pseudo stereo signal.
[0025]
The signal S 8 inputted to the third phase inverting means 17 and subjected to the phase
inversion is outputted from the second output terminal 3. The amplification feeling can be
reproduced by amplifying the power of the signals S7 and S8 outputted to the first and second
output terminals 2 and 3 respectively by the amplifier and reproducing them by the speaker. In
addition, by using a speaker having a directional characteristic of a dipole, in particular, as the
speaker, the spread feeling effect can be further enhanced.
[0026]
Next, the details of the function and configuration of the second phase inversion means 16
shown in FIG. 1 will be described using formulas. In the conventional example shown in FIG. 7, it
is assumed that the signal S0 is input to the input terminal 1 and the signal -S0 having the
opposite phase of the signal S0 input to the input terminal 1 is input to the other input terminal
30. Here, the reason for the reverse phase is to obtain a pseudo stereo signal from the signal S0
as a monaural signal. Based on this assumption, as shown in FIG. 3, in the block diagram of FIG.
7, the signal S0 input to the input terminal 1 is branched into two by the third two-branching
means 31, and the first output signal is divided. The signal S21 (-S0) inverted in phase is output
by inputting it to the first two-branching means 21 and inputting another second output signal to
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the third phase inverting means 32, and the signal S21 is outputted fourth This is equivalent to
the case of inputting to the 2-branching means 33 of
[0027]
Therefore, the time delay calculation by the first or third time delay means is [D1], and the time
delay calculation by the first and second time delay means or the third and fourth time delay
means is [D2]. When the equalizing operation by the first or third equalizer means is [E1], the
equalizing operation by the second or fourth equalizer means is [E2], and the signal input to the
input terminal 1 is [S] The signals S10 and S11 output to the output terminal 2 and the output
terminal 3 are expressed by Equations 1 and 2, respectively.
[0028]
S10 = SS ([D2] [E2]) + S ([D1] [E1]) Formula 1S11 =-{SS ([D2] [E2]) + S ([D1] [E]] E1]}... In the first
embodiment of the present invention shown in FIG. 1, when [S] is inputted as the input signal S0
of the input terminal 1, the signal S7 outputted to the first output terminal 2 Is expressed by
Equation 3, and the signal S8 output to the second output terminal 3 is expressed by Equation 4.
[0029]
S7 = S-S ([D2] [E2]) + S ([D1] [E1]) Equation 3S8 =-{S-S ([D2] [E2]) + S ([D1] [E2]) E1]) ... Equation
4 From Equation 4 or more, Equation 3 is equal to Equation 1 and Equation 4 is equal to
Equation 2, and the configuration shown in FIG. 1 is different from the configuration shown in
FIG. , S7 is equal to S10, and S8 is equal to S11.
[0030]
As described above, in the prior art, the configuration for two channels is required, whereas in
the first embodiment, it has a simple configuration for almost one channel, and has the same
spread feeling effect as the conventional one. Surround stereo can be provided.
[0031]
FIG. 4 is a block diagram of surround stereo according to a second embodiment of the present
invention.
The same reference numerals will be appended to the same functions as in the conventional
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example and the first embodiment.
[0032]
The signal S0 inputted to the input terminal 1 is branched into two by the first two-branching
means 21 and the first output signal thereof is inputted to the second phase inverting means 16
and the phase inverted signal S21 is outputted. .
The signal S21 is input to the first time delay means 11.
The second output signal branched into two by the two-branching means 21 is input as it is to
the adding means 23, and is input to the first phase inverting means and the phase-inverted
signal S5 and to the second equalizer means 14. The equalizing signal S4 is added by the
addition means 23, and a signal S7 is output.
[0033]
This signal S7 is branched into two by the second branching means 25 and the first output signal
is outputted from the first output terminal 2.
The second output signal branched into two by the third two-branching means 25 is inputted to
the third phase inverting means 17, and the phase-inverted signal S8 is outputted from the
second output terminal 3.
[0034]
In this second embodiment, when [S] is inputted as the input signal S0 of the input terminal 1,
the signal S7 outputted to the first output terminal 2 is expressed by the equation 3 and the
second output The signal S8 output to the terminal 3 is expressed by Equation 4, S7 is equal to
S10 and S8 is equal to S11, and the result is the same as in the first embodiment, and the same
effect is obtained.
[0035]
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FIG. 5 is a block diagram of surround stereo in the third embodiment of the present invention.
The same reference numerals will be appended to the same functions as in the conventional
example and the first to second embodiments.
[0036]
The output signal S4 of the second equalizer means 14 is inputted to the first phase inverting
means 15 and the phase inverted signal S5 is outputted. The addition means 23 adds the signal
S5, the first output signal of the first two-branching means 21 and the signal S3 output from the
first equalizer means 13 and outputs a signal S7. The signal S7 is branched into two by the
second branching means 25, and the first output signal is output to the first output terminal 2 as
it is. The second output signal is input to the second phase inverting means 16 to output the
phase inverted signal S8. The signal S 8 is output to the second output terminal 3.
[0037]
In this third embodiment, when [S] is input as the input signal S0 of the input terminal 1, the
signal S7 to be output to the first output terminal 2 is expressed by the equation 3, and the
second output terminal The signal S8 to be output to 3 is expressed by Expression 4, S7 is equal
to S10 and S8 is equal to S11, and the result is the same as in the first and second embodiments,
and the same effect can be obtained.
[0038]
FIG. 6 is a block diagram of surround stereo in the fourth embodiment of the present invention.
The same reference numerals will be appended to the same functions as in the conventional
example and the first to third embodiments.
[0039]
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The signal S7 added by the addition means 23 is input to the power amplification means 30, and
the power amplified signal S22 is output. The power-amplified signal S22 is input to the first and
second speakers 31, 32 connected in series and in reverse phase to each other, and sound waves
in reverse phase from each other from the first and second speakers 31, 32. Is played.
[0040]
Therefore, in the first embodiment shown in FIG. 1 and the second embodiment shown in FIG. 4,
the third phase inverting means 17 is unnecessary, and the third embodiment shown in FIG. In
the example, the second phase inverting means 16 is unnecessary. Also, the power amplification
means 30 can be realized by one channel, and further cost reduction can be realized.
[0041]
In addition to using a monaural reverberation signal as the signal to be input to the input
terminal 1 of the first to fourth embodiments, the surround effect is added to the reverberation
signal, and the surround of a Dolby surround source is also provided. A signal can also be used to
add a surround effect to the signal.
[0042]
Furthermore, by using the output signal of the vocal cancellation means for attenuating or
canceling the vocal signal contained in the two-channel stereo signal, it is possible to add a
surround effect to a generally commercially available two-channel stereo signal.
As the simplest configuration of this vocal cancellation means, there is a configuration example
in which a 2-channel stereo signal is subtracted.
[0043]
As described above, according to the present invention, in the first and second time delay means,
the signals from the speakers disposed in the lateral direction of the listener are on the left and
right ears of the listener. Make a time difference until it reaches. The first equalizer means makes
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a frequency characteristic difference of each signal reaching from the speaker arranged in the
lateral direction of the listener to the left and right ears of the listener. The first phase inverting
means, together with the first time delaying means and the first equalizer means, cancels or
attenuates the signal which is crosstalk of the signal from the speaker to be reproduced to the
left and right ears of the listener. Based on these operations, the second phase inverting means
can produce pseudo stereo sound.
[0044]
Therefore, the structure can be simplified and the cost can be reduced, and also by this simplified
structure, a surround effect having a sense of expansion can be obtained without limiting the
input signal.
[0045]
Brief description of the drawings
[0046]
1 is a block diagram of surround stereo according to the first embodiment of the present
invention
[0047]
Fig. 2 Circuit diagram of surround stereo of the same embodiment
[0048]
3 is an explanatory view of the second phase inversion means of the same embodiment.
[0049]
Fig. 4 Block diagram of surround stereo according to the second embodiment
[0050]
Fig. 5 Block diagram of Saland stereo according to the third embodiment
[0051]
Fig. 6 Block diagram of surround stereo according to the fourth embodiment
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[0052]
Fig. 7 Block diagram of conventional surround stereo
[0053]
Fig. 8 Circuit diagram of surround stereo in the conventional example
[0054]
Fig. 9 An explanatory view of the characteristic difference from the reproduction speaker of the
conventional example to both ears
[0055]
Fig. 10 An explanatory view of the characteristic difference from the speaker placed on the side
of the conventional example to the both ears
[0056]
Explanation of sign
[0057]
11 first time delay means 12 second time delay means 13 first equalizer means 14 second
equalizer means 15 first phase inversion means 16 second phase inversion means 17 third phase
inversion means 23 addition means 30 Power amplification means 31, 32 speakers
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