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JPS528802

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DESCRIPTION JPS528802
Secretary General of the Liver Agency 鞍 Name (027) Onkyo Co., Ltd. Representative Associate @
Takeshi Godai ■ Japan Patent Office ■ Japanese Patent Office 52-8802 庁 No. 23 Hiro 623 in
the Office Title of the Invention
Three-dimensional sound reproduction method
3. Detailed Description of the Invention The present invention relates to a three-dimensional
sound reproduction system for three-dimensionally reproducing a program source recorded by a
dummy head recording system. In the dummy head recording / reproducing system, as shown in
FIG. 1, a dummy head 2 imitating the head of a listener is placed at the center of the front of the
original sound field 1 and placed in the left and right ear parts 3L and 3H. The original sound
field 1 is recorded by the recording microphones 4L and 4R, the program source recorded with
the dummy head is reproduced by the headphone 5, and the signal of the left channel recorded
by the recording microphone 4 is only the left ear 6L of the listener The signal from the right
channel recorded by the recording microphone 4B is allowed to reach only the right ear 6H of
the listener to reproduce the original sound field 1 in three dimensions. In the case where the
dummy head recorded program source is stereoscopically reproduced from the normal speakers
7L and 7R as shown in FIG. 2, for example, a left channel signal reproduced from the left channel
speaker 7L (hereinafter referred to as L signal) Not only reach the listener's left ear 6L, but also a
time (delay time 〒. 2) after reaching the right ear 6H around the periphery of the head. After
this delay time elapses, the localization of the sound image becomes unclear due to an
unnecessary loss-talk signal (hereinafter referred to as an L 'signal) which reaches the right ear
6H and reaches EndPage: 1. In this regard, Damaske determines the correlation between the
delay of the signal '(-L' signal) to cancel the crosstalk signal, the phase, the amplitude, and the
localization of the sound image, as shown in FIG. We proposed a similar reproduction method. In
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FIG. 3, the L signal (R signal) is reproduced from the left (right) channel speaker 8L (8R), and the
relay signal (R signal) is delayed by the delay circuit 9 (delay time 1 '!'), Phase shifter An L 'signal
(R signal) is to be canceled through an equalizer circuit 12 consisting of a circuit 10 (phase shift
amount .theta.) And a gain control circuit 11 (gain G) to produce an -L' signal (-R 'signal) -L
'signal (-R' signal is reproduced from right (left) channel speaker 8L '(@ R /) and L' signal (R /
signal and -L 'signal (-R' signal is It is a system which mutually made it cancel each other.
According to the listening experiment, this reproduction method is located at the position of the
dummy head 2 at the time of recording, that is, at the vertex of the isosceles triangle whose
bottom is between the speakers @ L and 13 R of the left and right channels. When the L 'signal
(R' signal) and -L 'L' signal R 'signal cancel each other out, an excellent localization of the sound
image is recognized as shown in FIG. 4 (a).
However, when the listening position P is moved to the left or the right, the correlation between
the L 'signal (R' signal) and the -L 'signal (-R' signal) changes and the L 'signal ( The R'-fold signal
is hardly canceled, and as shown in FIG. 4 (b), (C), the localization of the sound image becomes
extremely unclear. That is, as shown in the figure, when moved to the listening position P or 10
crn or more, it is possible to obtain almost clear localization for a sound image within ± 30
degrees with the front center as 0 degree, 30 degrees or more, −30 degrees For the following
sound images, that is, sound images from the front left (forward right) to the left (right) to the
rear, the sound image to be perceived is P, -Damasks: The Journal of Acoutstical 5 ociety of
Amertic, aVoL5Q44 (paizt2) 19.71. Reported to. The present invention further improves this
regeneration scheme to eliminate the above disadvantages and will be described below. In the
above reproduction system, the crosstalk signal (L 'signal) is the left and right channel speakers
8L. 7. A relative position between the listening position P and the speakers 13L and 13L 'of the
left and right channels in the figure showing the relative position of the listening position P to
9L', ie, the reproduction system of the present invention in FIG. γ1. The angle な す 1 formed
between the radiation surface of the speakers 13L and 13L 'and the listening position. It changes
corresponding to ψ2. Therefore, at any listening position P, the left and right speakers 13L and
13L 'are actually limited to near the front center, but to cancel the L' signal, the L / double signal
L 'signal is followed It has to be changed to cancel this out. That is, -L 'signal, delay time, phase
shift amount θ, amplitude (. At the point of the first gain of the equalizer circuit 1 ′ ′ 2
(determined by the gain G of the control circuit 11), it is changed corresponding to the relative
position (γ1.γ7.ψ1.ψ,) of the listening position P Therefore, the correlation between the L
'signal and the -L' signal must be invariant. The same applies to the reproduction system of the
right channel signal. The present invention has been made based on such a technical idea, and
the relative position (γ1.γ1.ψ1.ψ2) of the listening position P to the left and right channel
speakers 13L (13R ′) and 13L ′ (13R) The detection power is detected by an appropriate
method, and the detected power is input to the equalizer circuit 12 and ↑, and the delay time te
17 of the equalizer circuit 12, the phase shift lθ, and the gain G correspond to the relative
position device of the listening position P. A reproduction system is provided in which the
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crosstalk signal is canceled at any listening position P by changing it.
Examples will be described below. In the figure, reference numerals 9 to 12 correspond to the
respective parts of the conventional system shown in FIG. 3, and reference numerals 13L (13R ')
and 13L' (13R) respectively post left to right and left channel signals. As shown in the figure, the
reproduction system of the signal of the left channel The reproduction system of the signal of the
right channel is constructed symmetrically, EndPage: 2, and the reproduction system of the
signal of the left channel will be described for simplicity. The code 14 receives the detection
signal emitted from the speakers 13L and 13L 'at the listening position P, detects the relative
position (γ9.γ7.ψ1, 6) of the listening position P with respect to the speakers 13L and 13L',
and detects this A known detection method is adopted in a relative position detection circuit for
converting the force into a predetermined control voltage. For example, after predetermined
detection signals are emitted from the positions of the speakers 13L and 13L 'and both detection
signals are received at the listening position P, the phase difference (time difference) between the
two detection signals and the amplitude difference are detected to listen The relative position of
the position P is detected. After that, this detection power is used to determine whether the pilot
signal is higher than the audio frequency. For example, when an ultrasonic tone bart wave is
adopted as a detection signal, as shown in FIG. 6, ultrasonic tone burst waves f, f of different
frequencies are respectively emitted from the positions of the speakers 13L, 13L '. After the two
detection signals are received by the two microphones 14a and 14b at the listening position P,
the two detection signal components l + f2 are taken out through the filters 15a and 15b, and
then the time difference between the two scratching signal components llf2 is made by the
known comparison circuit 16. (Phase difference) The amplitude difference is detected to detect
the relative position (γ7.γ1.ψ1.ψ,). Thereafter, this detection force is converted by the
conversion circuit 17 into a predetermined control voltage. Delay circuit 9 for determining G,
phase shifter circuit 10. Each parameter is input to the gain control circuit 11 j, and each
parameter changes in accordance with the control voltage, that is, the relative position of the
listening position P. The equalizer circuits 12 are each formed of a known circuit. The gain
control circuit 11 is a well-known voltage control type gain variable amplifier, and is constituted
by combining the delay circuit 9 and the phase shifter circuit IC1 inductance L. 11) The
resistance R is mainly replaced with a semiconductor element such as a field effect transistor,
and the capacitance C is replaced with a variable capacitance capacitor (varicap), and these
resistance B and capacitance C are changed by the control voltage. It is configured to obtain
delay time, phase shift, quantity θ).
Thus, in response to the movement of the listening position P, the relative amount θ of the
listening position P with respect to the spins 1-13L and 13L ′ and the gain G change
corresponding to the relative position of the detection force or the listening position P, The L
'signal should be canceled against the change of the L' signal. The -L 'signal follows and changes
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so as to cancel the' signal, maintaining the correlation between the L 'signal and the -L' signal.
Get down. Therefore, at any listening position P, the left and right speakers 13L and 13L 'are
actually limited to near the front center, but the L' signal and the -L 'signal cancel each other and
become unnecessary. The multiplication signal is removed, the localization of the sound image
becomes clear, and the original sound field can be reproduced faithfully. As described above, the
present invention is characterized by a reproduction system in which the phase gain G at the
listening position P with respect to the left and right channel speakers 13L and 13L 'is changed
to cancel out the crosstalk signal. It is also unnecessary at the listening position P, and the losstalk signal is removed, so that the localization of the sound image becomes clear, and there is an
advantage that ideal sound field C reproduction can be performed.
4. Brief description of the drawings. FIG. 1 is an explanatory view of a dummy head recording
and reproducing system, FIG. 2 is an explanatory view when a program source recorded with a
dummy head is reproduced by a normal speaker, and FIG. FIG. 4 is a diagram showing the result
of trial listening experiment, FIG. 5 is an explanatory diagram showing the configuration of the
three-dimensional sound reproduction system of the present invention, and FIG. 6 is a relative
diagram in one embodiment. FIG. 7 is a view showing a position detection circuit, and FIG. 7 is a
view showing a delay circuit and a phase shifter circuit in the same embodiment. 'F13L, 1λL' is a
speaker, P is a listening position, and EndPage: 3i2 is an equalizer circuit. -Example: Direction
EndPage: 4 '@ 6 Country East 7 囮 EndPage: 5
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