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JP2008236476

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DESCRIPTION JP2008236476
[PROBLEMS] In a portable information terminal equipped with two speakers, only one listener at
a specific position can receive the surround effect through the process of cancellation of
crosstalk caused by using two speakers Met. A processing circuit is provided which arranges
respective speakers at specific positions and performs crosstalk cancellation based on transfer
functions according to the respective positions when sound is output from these speakers. After
processing by this processing circuit, by outputting the sound from both speakers, it is possible
to hear the crosstalk canceled sound not only to the listener at a specific position but also to
listeners at other positions. It is possible to receive the surround effect. [Selected figure] Figure 1
Audio reproduction apparatus and audio reproduction method
[0001]
The present invention relates to an audio reproduction apparatus and an audio processing
method having two or more speakers to provide a surround effect.
[0002]
With the remarkable development of information communication technology in recent years,
various functions will be installed in information communication terminals such as mobile
phones, and the device of the optimal setting change is information communication according to
the installation of these various functions. It has been done for the terminal.
[0003]
In addition, as for the arrangement position of the speaker, it is also required to be installed at
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the optimum arrangement place according to the function to be mounted on the mobile phone.
[0004]
For example, in order to perform high-quality stereo sound reproduction, two speakers are
provided in the portable terminal device, and in order to reduce crosstalk that occurs between
the sound speakers, the optimum speaker arrangement position is devised There is a thing (refer
patent document 1: Unexamined-Japanese-Patent No. 2002-111817).
[0005]
In addition, there is an image display apparatus having a right channel speaker unit in the right
direction near the lower side of the display unit and a left channel speaker unit in the left
direction, and controlling the sound signal output of each speaker. (Refer patent document 2:
Unexamined-Japanese-Patent No. 2005-295382.).
[0006]
This depends on whether the image to be displayed on the display unit 10 of this apparatus is
displayed in portrait orientation (FIG. 14 (a)) or in landscape orientation (FIG. 14 (b)), as shown in
FIG. The virtual output point is localized so that sound effects can be obtained from the optimum
position according to the display direction, and processing is performed to localize the sound
digital local channel signal output and digital left channel signal It is a thing.
The digital right channel signal is output to the right speaker 71, and the digital left channel
signal is output to the left speaker 72.
JP, 2002-111817, A JP, 2005-295382, A
[0007]
As terminals are equipped with various functions, opportunities for multiple people to use these
functions via one terminal are also increasing.
[0008]
For example, in a terminal capable of receiving terrestrial waves, a television may be viewed by a
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plurality of people.
[0009]
However, all the processes that bring about the acoustic effects assume that only one mobile
phone user is present, and it is possible to produce an effect for only a single user.
[0010]
Therefore, even if a plurality of people enjoy using one terminal, for example, there is a problem
that only one user who is on the front side of the display direction can enjoy the surround effect
by having two speakers. The
[0011]
An object of the present invention is to provide a mobile phone capable of providing a surround
effect that can be enjoyed by a plurality of persons, which is the above-mentioned conventional
problem.
[0012]
An audio reproduction apparatus according to the present invention includes at least two or
more speakers and a signal processing circuit having a plurality of filters for performing
crosstalk elimination on an input signal to be output to the two speakers. The two speakers are
disposed at positions diagonal to a housing on which the speakers are mounted, and output
signals processed by the signal processing circuit to the two speakers. To provide an audio
reproduction device.
[0013]
Further, according to the audio reproduction method of the present invention, with respect to an
input signal supplied to two specific speakers among at least two or more speakers arranged at
positions diagonal to the casing and the speakers. Providing an audio reproduction method
characterized by performing processing for removing crosstalk caused by the outputs of the two
specific speakers, and outputting processed signals to the two speakers, respectively. Do.
[0014]
The audio reproduction apparatus of the present invention is provided with a signal processing
circuit for performing crosstalk elimination with respect to two speakers mounted in a housing,
and the two speakers are disposed at positions diagonal to the housing. Therefore, it is possible
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to provide not only users located in the display direction of the terminal but also other users
located in other directions with a surround effect by using two speakers.
[0015]
Embodiments of the present invention will be described in detail with reference to the drawings.
[0016]
First, the configuration of an information communication terminal 1 (hereinafter referred to as a
terminal) according to an embodiment of the present invention having two speakers will be
described with reference to FIGS. 1 to 3.
[0017]
FIG. 1 is a perspective view of the terminal 1 in the embodiment of the present invention.
[0018]
The terminal 1 according to the embodiment of the present invention is capable of providing an
acoustic effect to a plurality of listeners. The right speaker (hereinafter referred to as the lower
right speaker 74) and the left speaker (hereinafter referred to as the upper left speaker 75) are
disposed diagonally at the upper left position.
According to this position, as described in Patent Document 2, when viewing a moving image, the
user may set the display direction of the display unit 10 of the terminal 1 to be vertically long,
which is a conventional main usage form, or May be landscape.
Even when the display direction is changed to landscape, the user can enjoy the surround effect
due to the separation of the respective speaker positions.
[0019]
In addition, as shown in FIG. 1, the terminal 1 according to the embodiment of the present
invention is foldably coupled to the first housing 16 having the display unit 10 and the second
housing 17 via a hinge (not shown). Although a folding type terminal is illustrated, any type of
terminal such as a straight type or a two-axis rotary hinge type may be used.
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[0020]
FIG. 2 is a block diagram showing the configuration of the terminal 1 according to the
embodiment of this invention.
[0021]
In FIG. 2, the terminal 1 performs communication control between the CPU 12 (Central
Processing Unit) and the network of the terminal 1, authentication, execution of software on the
terminal, control of the display unit 10, and operation from the operation unit 14. A control unit
11 including a memory (ROM: Read Only Memory) 13 storing a computer program for
instructing the operation of the terminal 1, such as input control, and telephone directory data,
mail data, etc. that the terminal 1 uses during normal operation And a random access memory
(RAM) 15.
[0022]
The wireless communication unit 3 has a function of performing wireless communication with a
mobile communication network (not shown) via the antenna 4, modulates a transmission signal
and sends it as a wireless signal to the mobile communication network, from the mobile
communication network The radio signal is demodulated and sent to the control unit 11 as a
digital signal.
[0023]
The terminal 1 also receives a user's input from the receiver 6 that performs voice output such as
a call voice, the microphone 5 that receives the user's voice, and the keypad, etc., in order to
make a voice call. An operation unit 14 that converts key input into a signal and sends it to the
control unit 11, a display unit 10 that can display various information such as received e-mail
information and images, a ring tone for a user (listener), It includes a lower right speaker 74 and
an upper left speaker 75 which are reproduction means for reproducing music.
[0024]
The voice processing unit 2 converts voice input from the microphone 5 into voice data and
outputs the voice data to the wireless communication unit 3, and converts voice data received
from the wireless communication unit 3 into voice and outputs the voice to the receiver 6 .
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Further, at the time of ringing tone reproduction or music reproduction, the sound processing
unit 2 outputs the right signal and the left signal output from the signal processing circuit 21 to
the left and right speakers (here, the lower right speaker 74 and the upper left speaker 75).
[0025]
In this way, the sound signals output from both speakers reach the listener 27's ear, but if there
are two left and right speakers here, an event called crosstalk occurs.
[0026]
This means that the sound signals radiated from the lower right speaker 74 and the upper left
speaker 75 can be heard by the other ear other than the ear to which the sound is to be
transmitted.
[0027]
Therefore, in the case where two speakers are provided, a filter design is performed to cancel
crosstalk for not letting the listener 27 hear an extra sound in order to enhance the surround
effect.
[0028]
The audio processing unit 2 has a signal processing circuit 21 which also performs crosstalk
cancellation processing on signals output to these speakers.
[0029]
The signal processing circuit 21 processes signals to be output to both speakers by performing
filtering.
[General Crosstalk Cancellation Processing] FIG. 3 is a perspective view showing a comparison
terminal 1 ′ (hereinafter simply referred to as a terminal 1 ′) for comparison with the terminal
1 according to the embodiment of this invention.
[0030]
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First, in order to explain crosstalk cancellation by the signal processing circuit 21, when general
speaker arrangement is performed, that is, as shown in FIG. 3, simply at the same height position
on the left and right of the display unit 10. A terminal 1 'will be described as an example in which
the right speaker 71 and the left speaker 72 are disposed.
[0031]
Here, since the terminal 1 'differs from the terminal 1 according to the embodiment of the
present invention only in the configuration of the signal processing circuit 21' and the filter
included in this circuit, the other components are common. The numbers shall be used.
In addition, the terminal 1 'is a right speaker at the same height with respect to the longitudinal
direction of the housing on the side surface of the display unit 10 or the side surface with respect
to the surface on which the display unit 10 is arranged. 71 and the left speaker 72 are provided.
[0032]
FIG. 4 is an image diagram showing the relationship between the two speakers of the terminal 1 ',
the signal processing circuit 21' for performing signal processing for crosstalk cancellation, and
the listener 27. As shown in FIG.
[0033]
Here, the listener 27 is assumed to be present on the left and right center of both speakers of the
terminal 1 ′.
[0034]
The crosstalk cancellation of the left and right speakers 71 and 72 is performed by the signal
processing circuit 21 ′ of the audio processing unit 2.
[0035]
The signal processing circuit 21 ′ performs filter processing on the right signal a for the right
speaker and the left signal b for the left speaker, which are input signals generated by the audio
processing unit 2, and outputs the filtered signals to the respective speakers Do.
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[0036]
Further, as shown in the figure, the signal processing circuit 21 ′ outputs a first filter 81 that
outputs a branched signal from the left signal b for the left speaker to the right speaker 71, and a
branched signal from the right signal a for the right speaker. Are outputted to the left speaker
72, and the respective signal processing is performed.
[0037]
These filters are equivalent circuits for canceling crosstalk generated between the left and right
speakers, and in FIG. 4, F1 is shown as the transfer characteristic of the first filter 81, and F2 is
shown as the transfer characteristic of the second filter 82. .
[0038]
Further, both the first filter 81 and the second filter 82 also perform processing of phase
displacement of the input branched signal in order to cancel crosstalk generated in the left and
right speakers.
[0039]
Under the control of the control unit 11, the signal processing circuit 21 ′ outputs the signal
that has passed through the first filter 81 to the right speaker 71 via the right subtractor 91.
Similarly, the signal processing circuit 21 ′ outputs the signal that has passed through the
second filter 82 to the left speaker 72 via the right subtractor 92.
[0040]
Thereby, the right speaker 71 outputs a sound signal a after subtracting the signal obtained by
processing a part of the left signal b with the first filter 81 from the right signal a, and similarly,
the left speaker 72 similarly outputs , And a sound signal b obtained by subtracting a signal
obtained by processing a part of the right signal a by the second filter 82.
[0041]
With this filter, the control unit 11 can remove only the component of the sound that is crosstalk
that reaches the listener 27's ear.
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[0042]
That is, the signal processing circuit 21 ′ performs an inversion process with a filter on the
component of the sound to be crosstalk, and outputs the processed sound signal to the right
speaker 71 and the left speaker 72.
[0043]
As a result, the sound signal which is the component of the sound to be the crosstalk is mutually
canceled with the sound signal subjected to the inversion processing and does not reach the ear
of the listener 27.
[0044]
The listening sound subjected to the crosstalk cancellation processing by the signal processing
circuit 21 'will be described below.
[0045]
Here, the transmission characteristic from the right speaker 71 to the right ear of the listener 27
is [A], the transmission characteristic to the left ear is [A] ', and similarly, the transmission from
the left speaker 72 to the left ear of the listener 27 The characteristic is [B], and the transmission
characteristic to the right ear is [B] '.
[0046]
Also, the sound signal a outputted from the right speaker 71 shown in FIG. 4 includes the
transfer characteristic [A] of the sound between the right speaker 71 and the right ear [SR],
similarly, from the left speaker 72 similarly. A listening sound including the transfer
characteristic [B] between the left speaker 72 and the left ear in the output sound signal b is set
as [SL].
[0047]
[SR] and [SL] are right signal a and left signal b, transfer characteristics [A] and [B], F1 indicating
the transfer characteristics of the first filter 81, F2 indicating the transfer characteristics of the
second filter 82 Can be shown as follows.
[0048]
[SR] = [A] · (a−b · F1) −− ((1) −R) [SL] = [B] · (b−a · F2) −− ((1) −L) Similarly, the sound
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signal b output from the left speaker 72 includes the transfer characteristic [B] 'from the left
speaker 72 to the right ear [S]' and the sound output from the right speaker 71. Assuming that
the listening sound including the transfer characteristic [A] 'between the right speaker 71 and
the left ear in the signal a is [SR]', the listening sound which is crosstalk can be shown as follows.
[0049]
[SR] ′ = [A] ′ · (a−b · F1) −− ((2) −R) [SL] ′ = [B] ′ · (b−a · F2) −− ((2 )-L) All the sounds
to be heard by the right ear (hereinafter referred to as [HR]) include the sound that cross talks, so
assuming that the transfer characteristics [A] and [B] have a value of 1, respectively, 1) and (2),
[HR] = [SR] + [SL] '--((3)-R) = [A] (a-b F1) + [B]' (b) −a · F2) = a ([A] −F2 · [B] ′) + b ([B] ′ − [A] ·
F1) −−− ((4) −R) All sounds heard by the left ear (Hereinafter referred to as [HL]), [HL] = [SL]
+ [SR] ′ −− ((3) −L) = [B] · (b−a · F2) + [A] ′ -(Ab-F1) = a ([A] '-F2-[B]) + b ([B]-F1- A) '-((4) -L)
Here, with respect to the transfer characteristic from the left speaker 72 to the right ear of the
listener 27, if [B]' = [A] .F1 holds, the formula 5)-R), [HR] = a ([A]-F 2 · [B] ') (∵ [B]' = [A] · F 1)--((5)-R) Similarly, Regarding the transfer characteristic from the right speaker 71 to the left ear of
the listener 27, if [A] '= [B] · F2 holds, the equation ((5)-L) becomes: [HL] = b ([B]- F1 · [A] ′) (∵
[A] ′-F2 · [B] −− ((5) −L) can be shown.
Thus, only the sound signal a output from the right speaker 71 remains in the right ear, and only
the sound signal b output from the left speaker 72 remains in the left ear.
[0050]
Thus, when the filter value is calculated and designed, the listener 27 listens to the sound signal
a from the right speaker 71 only with the right ear and the sound signal b from the left speaker
72 only with the left ear, It becomes possible to experience the spread of sound that is a
surround effect.
[0051]
[Crosstalk Cancellation Processing of the Embodiment of the Present Invention] Next, a filter
design for providing the surround function of the embodiment of the present invention will be
described.
[0052]
First, a listener who is in the normal viewing position with respect to the terminal 1 (hereinafter
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referred to as a vertical listener 28) and a listener who is in a viewing position next to the right
with respect to the vertical listener 28 (hereinafter referred to as a right horizontal listener 29)
will be described.
[0053]
FIG. 5 shows the first housing 16 of the terminal 1 according to the embodiment of the present
invention, the standing positions of the vertical listener 28 and the right horizontal listener 29,
and the transfer characteristics to the left and right ears of each listener. FIG.
[0054]
As shown in FIG. 5, viewing from the standing position of the longitudinal listener 28 to viewing
on the display unit 10 that has been made vertically-long vertical viewing vertically, viewing from
the standing position to the right horizontal listener 29 using the display unit 10 that is
elongated horizontally To view sideways.
[0055]
Further, the standing position of the vertical listener 28 is assumed to be on the center of the
right and left of both the left and right speakers, as in the case of the standing position of the
listener of the terminal 1 ′ described above.
Thereby, the listening sound [HR (v)] in the right ear of the longitudinal listener 28 and the [HL
(v)] listening sound in the left ear are the listening sounds [HR] and [HL of the listener of the
terminal 1 'described above. [HR (v)] = [HR] = [SR] + [SL] '-((4) -R) [HL (v)] = [HL] = [SR]' + It is
possible to show by [SL]-((4) -L).
[0056]
The listening sound of the right horizontal listener 29 existing at the same equidistant distance
from the terminal 1 to the vertical listener 28 and centered on the right and left of the lower
right speaker 74 and the upper left speaker 75 will be described with reference to FIG.
[0057]
First, in FIG. 5, the distance from the terminal 1 to the right horizontal listener 29 and the
distance to the vertical listener 28 are equal distances, and both listeners are located at the
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centers of both speakers so that the transfer characteristics are obtained. Also, with the line (u-u
') connecting the upper left speaker 75 and the lower right speaker 74 as an axis, the right
horizontal listener 29 exists at a position symmetrical with the position of the vertical listener 28.
[0058]
Therefore, the distance from the lower right speaker 74 to the right ear of the longitudinal
listener 28 and the left ear of the right horizontal listener 29 is equal, and therefore, the transfer
characteristic of sound between them is indicated by [A]. Is possible.
[0059]
Similarly, the distance from the upper left speaker 75 to the left ear of the longitudinal listener
28 and the right ear of the right horizontal listener 29 is equal, and the transfer characteristic
between them can be indicated by [B].
[0060]
Furthermore, the transfer characteristic from the lower right speaker 74 to the right ear of the
right side listener 29 is shown by [A] ', and the transfer characteristic from the upper left speaker
75 to the left ear of the right side listener 29 is shown by [B]' it can.
[0061]
Thereby, the listening sound [HR (Rh)] in the right ear of the right side listener 29 is transmitted
between the lower right speaker 74 and the left ear to the sound signal a outputted from the
lower right speaker 74 shown in FIG. The listening sound [SR] ′ including the characteristic [A]
′ and the listening sound [SL] including the transfer characteristic [B] between the upper left
speaker 75 and the right ear in the sound signal b output from the upper left speaker 75 Is
added.
[HR (Rh)] = [SL] + [SR] ′ −− ((6) −R) Similarly, the listening sound [HL (Rh)] in the left ear of
the right lateral listener 29 is the upper left speaker 75. Sound signal b output from the upper
left speaker 75 including the transfer characteristic [B] 'between the right ear of the right lateral
listener 29 and output from the lower right To the sound signal a, there is added [SR] which is a
listening sound including the transfer characteristic [A] between the lower right speaker 74 and
the left ear of the right lateral listener 29.
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[HL (Rh)] = [SR] + [SL] '--((6)-L) At this time, signal processing performed in the signal processing
circuit in the terminal 1 according to the embodiment of the present invention, and The listening
states of the listener 28 and the right side listener 29 will be described with reference to FIG. 6
with respect to the filtering process for the right signal a and the right signal b and the sound
signal a and the sound signal b output from the speaker.
[0062]
FIG. 6 is an image diagram showing the relationship between the two speakers of the terminal 1,
the signal processing circuit 21 performing signal processing for crosstalk cancellation, and the
vertical listener 28.
[0063]
The signal processing circuit 21 of the terminal 1 according to the embodiment of the present
invention further includes the third filter 85 and the input signal output from the audio
processing unit 2 in the signal processing circuit 21 ′ in the terminal 1 ′ shown in FIG. , And
the left signal b is input to the upper left speaker 75.
[0064]
Further, as shown in FIG. 5, the respective speakers are arranged diagonally to the first housing
16, and the distance between each speaker and the listener is different. Therefore, the lower
right speaker shown in FIG. 74 and the upper left speaker 75 are not shown so as to be present
side by side.
[0065]
The listening sounds [SR] and [SL] shown in FIG. 6 are the right signal a and the left signal b, F1
indicating the transfer characteristics of the first filter 83, F2 indicating the transfer
characteristics of the second filter 84, and the third filter 85. Can be shown as follows using F3
indicating the transfer characteristics of the above and the transfer characteristics described
above.
[0066]
[SR] = [A] (ab? F1)--((7)-R) [SL] = [B] (b-F3-a-F2)--((7)-L) The sound signal a outputted by the lower
right speaker 74 shown in FIG. 6 actually reaches the left ear of the longitudinal listener 28 and
the listening sound including the transfer characteristic thereof [SR] ', similarly for the upper left
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speaker 75 A listening sound including the signal that the output sound signal b has reached to
the right ear and its transfer characteristic is [SL] ′.
[0067]
Thus, the listening sounds [SR] ′ and [SL] ′ shown in FIG. 6 can be represented as follows
using the right signal a and the left signal b and the above-described transfer characteristics.
[0068]
[SR] '= [A]' (ab * F1)-((8) -R) [SL] '= [B]' (b-F3-a-F2)-((8 ) -L) The listening sounds [HR (v)] and [HL
(v)] of the longitudinal listener 28 can be obtained from the expressions (4), (7) and (8), [HR (v)] =
[SR] + [SL] '= [A] (ab * F1) + [B]' (b * F3-a * F2) = [A] * a- [A] * b * F1 + [B] '* b -F3- [B] '-a-F2 = a
([A]-[B]'-F2) + b ([B] '-F3- [A] -F1)-((9) -R) [HL (v)] = [SR] '+ [SL] = [A]' (a-b-F1) + [B] (b-F3-a-F2) =
[A] '-a- [A]・ B ・ F 1 + [B] [b F F 3-[B] ・ a F F 2 = a -[A] '· F1)---((9)-L) It can show.
[0069]
Here, if [B] '· F3 = [A] · F1, the value of the equation (9) -R is as follows.
[0070]
[HR (v)] = a ([A]-[B] '· F2) (∵ [B]' · F3 = [A] · F1)---((10)-R) Similarly, [A ] '= [B] · F2, the value of the
equation (9)-L is as follows.
[0071]
[HL (v)] = b ([B] · F3-[A] '· F1) (∵ [A]' = [B] · F2)---((10)-L) Thus, the first The values of the first
filter 83 (F1), the second filter 84 (F2), and the third filter 85 (F3) to the values of the transfer
functions [A], [A] ', [B], and [B]' In contrast, they are designed to be formulas ((10) -R) and ((10) L).
[0072]
As a result, only the right signal a can be heard in the right ear of the vertical listener 28 and
only the left signal b can be heard in the left ear, and the terminal 1 can provide a surround
effect.
[0073]
Further, how to hear the right side listener 29 at this time will be described.
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[0074]
According to FIG. 5 and the equation (6), the right-handed listener 29 listens to the sound: [HR
(Rh)] = [SR] ′ + [SL] −− ((6) −R) [HL (Rh)] = It is represented by [SR] + [SL] '-((6) -L).
[0075]
The signal processing performed in the signal processing circuit at this time will be described.
[0076]
The listening sounds [HR (Rh)] and [HL (Rh)] of the right side listener 29 are [SR], [SL], [SR] ', and
[SL] shown in the equations (7) and (8). The following equation can be derived from equation (6)
using '.
[0077]
[HR (Rh)] = [SR] '+ [SL] (= [HL (v)]) = [A]' (a-b-F1) + [B] (b-F3-a-F2) = [ A] '-a- [A]'-b-F1 + [B] -b-F3[B] -a-F2 = a ([A] '-[B] -F2) + b ([B] -F3) -[A] '· F1)--((11)-R) [HL (Rh)] = [SR] + [SL]' (= [HR (v))] = [A]
(a-b) F1) + [B] '(b.F3-a.F2) = a ([A]-[B]'. F2) + b ([B] '. F3- [A] .F1)- (11)-L) The condition "[A] '= [B] ·
F2" represented by the equation (10) can be expressed as "[B]' · F3 = [A]" in the equation (11-R).
Substituting F1 ′ into the equation ((11) −L), [HR (Rh)] = b ([B] · F3− [A] · F1) --- ((11) -R) [HL
(Rh)] = a ([A] - [B] · F2) --- ((11) becomes -L).
[0078]
From this equation (11), it is shown that the right lateral listener 29 listens to only the left signal
b with the right ear and only the right signal a with the left ear.
[0079]
Therefore, the right side listener 29 can also hear the crosstalk canceled sound.
[0080]
Further, under the condition that [A] ′ = [B] · F2 and [B] ′ · F3 = [A] · F1 hold, according to
Equations (10) and (11), ] = [HL (v)]) ([HL (Rh)] = [HR (v)]) holds.
[0081]
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That is, compared to the vertical listener 28, the right horizontal listener 29 receives the sound
signal a of the lower right speaker 74 to the left ear and the sound signal b of the upper left
speaker 75 to the right ear, and the vertical listener 28 Will hear the sound that the left and right
are reversed.
[0082]
However, the listener can enjoy the three-dimensional surround effect only by performing the
crosstalk cancellation process of the sound from both speakers, and in this regard, the surround
effect of the embodiment of the present invention It is possible to provide an audio reproduction
device and an audio reproduction device that bring about
[0083]
Next, how to determine the value of the third filter 85 (F3) will be described in order to listen not
only to the crosstalk canceled sound but also to listen to equivalent sounds at the left and right
ears.
[0084]
In order to simplify the description, it is assumed that the first filter 83 and the second filter 84,
which are equivalent circuits for crosstalk cancellation performed in the signal processing circuit
21 shown in FIG. 6, are not provided.
[0085]
Here, on the basis of this assumption, considering the signal sound reaching the left and right
ears of the longitudinal listener 28 by using the equations (9) -R and the equations (9) -L, the
following equation It becomes possible to show by.
[0086]
[HR (v)] = a [A] + b [B] '-F3- ((9)'-R) [HL (v)] = a [A] '+ b [B] -F3-( (9) '-L) Next, the hearing sounds
in the case of using the terminal 1' shown in FIG. 3 with equal distances between the left and
right ears of the listener 27 and the left and right speakers [HR], [HL] ] Is as the above-mentioned
Formula ((4) -R) and Formula ((4) -L).
[0087]
That is, [HR] = a ([A] -F2. [B] ') + b ([B]'-[A] .F1)-((4) -R) [HL] = a ([A] ] -F2 · [B] + b ([B]-F1 · [A] ')-((4)-L) Here, the formula ((9)' -R) and the formula ((9) As in the case of '-L), it is an equivalent
10-05-2019
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circuit for crosstalk cancellation performed in the signal processing circuit 21' shown in FIG. 4,
and it is assumed that the first filter 83 and the second filter 84 are absent. Considering, it can be
shown by the following equation.
[0088]
[HR] = a [A] + b [B] '[HL] = a [A]' + b [B] Here, since the distances to the left and right speakers are
equal, respectively, [A] = [B] ], [A] '= [B]', the equation ((4) -R) and the equation ((4) -L) are
represented by the following equation ((4) '-R) and the equation ((4) ) -L) can be shown.
[HR] = a [A] + b [B] '= a [A] + b [A]'-((4) '-R) [HL] = a [A]' + b [B] = a [A] ] '+ B [A]-((4)'-L) Formula
((4) '-R) and Formula ((4)'-L) are the distance between the left and right ears of the listener 27
and the left and right speakers In the terminal 1 'where is equal, the case where the first filter 81
(F1) and the second filter 82 (F2) are not used, indicates the listening sound that reaches the left
and right ears.
[0089]
Here, in comparison with the above-mentioned formula ((9) '-R) and the formula ((9)'-L), [B] '· F3
= [A]', [B] · F3 = [A] When the longitudinal listener 28 hears the terminal 1 1 [HR (v)] and [HL (v)],
the listener 27 hears the terminal 1 ′ with the same listening sound [HR] and [HL].
[0090]
That is, when F3 satisfies the following equation, the listening sounds of the left and right ears at
the terminal 1 are the conditions for listening as the listening sounds when the left and right ears
and the left and right speakers are equidistant.
[0091]
F3 = ([A] '/ [B]') = ([A] / [B]) Thereby, while providing the surround effect by performing crosstalk
cancellation in the terminal 1, the listener's It becomes possible to provide equivalent listening
sounds to the left and right ears.
[0092]
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The right side listener 29 is described only in the case where it is present on the right side of the
terminal 1 in FIG.
This is because the right lateral listener 29 present on the left side can not enjoy the surround
effect by the crosstalk cancellation according to the embodiment of this invention.
Second Embodiment Subsequently, an information communication terminal 100 (hereinafter
referred to as a terminal 100) for performing crosstalk cancellation according to a second
embodiment of the present invention will be described.
[0093]
FIG. 7 is a perspective view of the terminal 100 according to the second embodiment.
[0094]
The difference from FIG. 1 showing the terminal 1 of the first embodiment is that the
arrangement position of the speakers is different, that is, the lower left speaker 76 instead of the
lower right speaker 74 and the upper right speaker 73 instead of the upper left speaker 75 are
arranged. It is the point that is done.
[0095]
FIG. 8 is a block diagram showing the configuration of the terminal 100 according to the second
embodiment.
The audio processing unit 2 outputs the signal processed by the signal processing circuit 21 to
the upper right speaker 73 instead of the lower right speaker 74 and the lower left speaker 76
instead of the upper left speaker 75 respectively.
[0096]
As described above, the terminal 100 according to the second embodiment differs from the other
components only in the position of the speaker, and thus the other components are the same as
FIG. 1 which is a block diagram showing the configuration of the first embodiment. The number
is used.
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[0097]
FIG. 9 is an image diagram showing the relationship between the terminal 100 (only the first
case 160 is shown) and the listener in the second embodiment.
[0098]
As shown in FIG. 9, the terminal 100 of the second embodiment is a so-called point target
position in which the positions of the left and right speakers are opposite to each other with
respect to the terminal 1 of the first embodiment. is there.
[0099]
Therefore, the description will be continued assuming that the horizontal listener 30 (hereinafter
referred to as the left horizontal listener) in the terminal 100 is positioned on the left side with
respect to the vertical listener 28.
[0100]
Here, the vertical listener 28 and the left horizontal listener 30 are at the left and right center of
the terminal 100, and the distance from the vertical listener 28 to the terminal 100 is equal to
the distance between the left horizontal listener 30 and the terminal 100. I assume.
[0101]
Also, in order to simplify the description to be described later, it is assumed that the distance
between the vertical listener 28 and the terminal 100 is the same as the distance from the
terminal 1 to the listener 27 in the first embodiment shown in FIG. Do.
[0102]
That is, the positional relationship between the terminal 100, the longitudinal listener 28 and the
left horizontal listener 30 in FIG. 9 and the terminal 1, the longitudinal listener 28 and the right
lateral reception in FIG. 5 shown as the terminal 1 of the first embodiment. The positional
relationship with the listener 29 is axisymmetrical with respect to the left and right centers of the
terminal 100.
[0103]
Therefore, as in the first embodiment, the transmission characteristic from the upper right
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19
speaker 73 to the right ear of the longitudinal listener 28 is [B], and the transmission
characteristic to the left ear of the longitudinal listener 28 is [B] ', The transfer characteristic
from the lower left speaker 76 to the left ear of the longitudinal listener 28 can be indicated by
[A], and the transfer characteristic to the right ear can be indicated by [A] '.
[0104]
Similarly, the transmission characteristic from the lower left speaker 76 to the right ear of the
left horizontal listener 30 is [A], the transmission characteristic to the left ear is [A] ', the upper
right speaker 73 to the left ear of the left horizontal listener 30 It is also possible to indicate the
transfer characteristic of [B] and the transfer characteristic to the right ear by [B] '.
[0105]
The configuration of the signal processing circuit 21 included in the terminal 100 according to
the second embodiment and the processing content are the same as those of the terminal 1
according to the first embodiment.
[0106]
That is, in the terminal 1 according to the first embodiment, the signal output to the lower right
speaker 74 is output toward the lower left speaker 76 in the terminal 100 according to the
second embodiment. In the terminal 1 of the embodiment, it is assumed that the signal output to
the upper left speaker 75 is output to the upper right speaker 73 in the terminal 100 of the
second embodiment.
[0107]
In this case, the listening sounds [HR (v)] and [HL (v)] reaching the ears of the longitudinal
listener 28 are the listening sounds and the left and right reaching the left and right ears of the
longitudinal listener 28 in the first embodiment. Since the relationship is reversed, it can be
shown by the following equation from the equation ((9) -R) and the equation ((9) -L).
[0108]
[HR (v)] = [SR] '+ [SL] = a ([A]'-[B] .F2) + b ([B] .F3- [A] '. F1)-((9) −R) [HL (v)] = [SR] + [SL] ′ = a
([A] − [B] ′ · F2) + b ([B] ′ · F3− [A] · F1) −−− ((9) -L) Further, the left side listener 30 hears
the listening sound which is turned to the left and right with respect to the listening sounds in
the right and left ears of the right side listener 29 in the first embodiment. .
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[0109]
For this reason, the listening sounds [HR (Lh)] and [HL (Lh)] reaching the left and right ears of
the left horizontal listener are expressions representing [HL (Rh)] and [HR (Rh)], respectively (((
11)-L) and formula ((11)-R), it is possible to show with a formula ((12)-R) and a formula ((12)-L).
[0110]
[HR (Lh)] = [SR] + [SL] '= [A] (a-b-F1) + [B]' (b-F3-a-F2) = a ([A]-[B] '· F2) + b ([B]' · F3-[A] · F1)-((12)-R) [HL (Lh)] = [SR] '+ [SL] = [A]' (a −b · F1) + [B] (b · F3-a · F2) = a ([A] ′ − [B] · F2) + b ([B]
· F3- [A] ′ · F1) −−− ((12) -L) Here, if [B] '· F3 = [A] · F1 and [A] ′ = [B] · F2, then the formula
(9) -R, the formula (9)- The value of L is as follows.
[0111]
[HR (v)] = b ([B] · F3-[A] '· F1) (∵ [A]' = [B] · F2)---((13)-R) [HL (v) ] = A ([A]-[B] '· F2) (∵ [B]' · F3 =
[A] · F1)---((13)-L) Thus, the second embodiment The longitudinal listeners 28 in the left and right
are opposite to the left and right listening to the longitudinal listeners in the first embodiment.
[0112]
That is, the longitudinal listener 28 in the second embodiment can listen to the left signal b with
the right ear and can listen to the right signal a with the left ear, and as a result, the equation
(13-R) As shown in Equation (13) -L), it becomes possible to hear crosstalk-cancelled listening.
[0113]
Next, the above-mentioned formula ((12) -R) and formula ((12) -L) indicating the listening sounds
[HR (Lh)] and [HL (Lh)] of the left horizontal listener 30 are [B] Under the conditions of '· F3 = [A]
· F1 and [A] ′ = [B] · F2, [HR (Lh)] = a ([A] ′ − [B] · F2) −−− (12)-R) It becomes possible to
show with a formula called [HL (Lh)] = b ([B] '* F3- [A] * F1)--((12) -L).
[0114]
This indicates that the left lateral listener 30 listens to the right signal a with the right ear and
listens to the left signal b with the left ear.
[0115]
Furthermore, under this condition, ([HR (Lh)] = [HL (v)]) ([HL (Lh)] = [HR (v)]) holds.
10-05-2019
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[0116]
This means that the left horizontal listener 30 who is in the left horizontal position instead of the
right horizontal listener 29 also listens to the sound that is opposite to the left and right listeners
of the vertical listener 28 in the second embodiment. The terminal 100 also indicates that it is
possible to hear the crosstalk canceled sound.
[0117]
Therefore, by using the terminal 100 according to the second embodiment of this invention, the
left horizontal listener 30 located on the left side of the terminal 100 can also listen to the
crosstalk canceled sound.
[0118]
Thus, any listener can hear the crosstalk canceled sound from both speakers, and can enjoy the
three-dimensional surround effect.
[0119]
It becomes possible to provide the sound reproducing apparatus and the sound reproducing
method for providing the surround effect of the second embodiment of the present invention to
the vertical listener 28 and the left horizontal listener 30.
[0120]
As in the embodiment of the present invention, in the second embodiment, only the left listener
30 can hear the crosstalk canceled sound, and the right listener 29 located on the right side is:
The surround effect due to crosstalk cancellation in the second embodiment of the present
invention can not be enjoyed.
[0121]
Third Embodiment Next, a terminal 101 according to a third embodiment of the present
invention will be described.
[0122]
FIG. 11 is a perspective view showing the terminal 101 of the third embodiment.
[0123]
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As shown in FIG. 11, the housing 161 of the terminal 101 has four speakers, which are
respectively an upper right speaker 73, a lower right speaker 74, an upper left speaker 75, and a
lower left speaker 76.
[0124]
FIG. 12 is a block diagram showing the configuration of a terminal according to the third
embodiment.
[0125]
Under the control of the control unit 11, the audio processing unit 20 outputs the signal
processed by the signal processing circuit 21 to these speakers.
[0126]
Since the terminal 101 is the same as the first embodiment shown in FIG. 2 except for the
speaker and the audio processing unit 20, the description will proceed with the same numbers in
FIG.
[0127]
Here, when the terminal 101 according to the third embodiment outputs a sound from the
speakers, a first output mode for outputting using two of the lower right speaker 74 and the
upper left speaker 75, and the upper right speaker 73 It is characterized by selecting and
outputting any of the 2nd output forms output using two of the lower left speaker 76. FIG.
[0128]
The speakers (upper right speaker 73, lower right speaker 74, upper left speaker 75, lower left
speaker 76) can be freely switched by a switching circuit (not shown) included in the audio
processing unit 20 based on an instruction from the control unit 11.
[0129]
This switching also enables switching between the first output mode and the second output
mode.
[0130]
In the first output mode, the control unit 11 performs the same speaker control as that of the
10-05-2019
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terminal 1 of the first embodiment, and in the second output mode, the control unit 11 performs
the same control with the terminal 100 of the second embodiment. The same speaker control is
performed.
[0131]
Based on the control of the control unit 11, the switching circuit (not shown) of the audio
processing unit 20 switches which of the speakers the signal processed by the signal processing
circuit 21 is to be connected in accordance with which output form is used.
[0132]
That is, in the case of the first output mode, the signal processed by the signal processing circuit
21 and output through the right subtractor 93 is output to the lower right speaker 74 and the
signal output through the left subtractor 94 is It is output to the upper left speaker 75.
[0133]
Further, in the case of the second output mode, the signal output through the right subtractor 93
is output to the lower left speaker 76, and the signal output through the left subtractor 94 is
output to the upper right speaker 73.
[0134]
The listener switches the output mode of the terminal 101 via the operation unit 14 depending
on whether the side listener is located on the right side or the left side.
By switching the output mode, the control unit 11 can listen to the crosstalk canceled sound by
operating the terminal 101 by the listener even if the horizontal listener is at any position.
[0135]
In the first to third embodiments described above, the longitudinal listener 28 and the right
lateral listener 29 or the left lateral listener have the longitudinal direction as the Y axis and the
lateral direction as the X axis. A two-dimensional explanation was given to only two of thirty.
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However, on condition that the listener is at the left and right center of both speakers and at the
same distance from the terminal 1 as other listeners, the listener may be present in the Z-axis
direction.
[0136]
That is, when a listener is present on an arc satisfying these conditions, the listener can listen to
the crosstalk canceled sound of the embodiment of the present invention at any position.
[0137]
As described above, according to the crosstalk cancellation method of the present invention and
the information communication terminal in which the crosstalk cancellation is performed, a
plurality of listeners can hear the crosstalk-canceled sound.
[0138]
Modified Example Next, a modified example of the embodiment of the present invention will be
described.
[0139]
FIG. 13 shows a terminal 102 in a modification of the embodiment of the present invention.
[0140]
The terminal 102 in the modification of the embodiment of the present invention has a speaker
and receiver 77 and a speaker and receiver 77 that performs the function of a speaker.
[0141]
In the first to third embodiments of the present invention, the signal processing unit 2 outputs
the signal a and the signal b to the predetermined speaker according to the speaker disposed at
the predetermined position.
[0142]
In the terminal 102 in the modification, the control unit 11 uses the speaker and receiver 77 to
output one signal (for example, the signal a) to, for example, the lower left speaker 76 and the
other signal (for example, the signal b) for It outputs to the speaker and receiver 77 disposed at
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the upper right of the body 162.
[0143]
Here, audio reproduction is performed using the lower left speaker 76 and the speaker / receiver
77 which are paired.
[0144]
That is, in the terminal 102 shown in FIG. 13, the control unit 11 performs control of sound
reproduction similar to that of the terminal 100 according to the second embodiment of the
present invention, which performs sound reproduction using the lower left speaker 76 and the
upper right speaker 73. Do.
[0145]
Here, the description is made on the assumption that the speaker / receiver 77 is disposed at the
upper right position that is diagonal to the lower left speaker 76 and the lower left speaker.
[0146]
However, as shown in FIG. 2, FIG. 8, and FIG. 11, as in the first to third embodiments of the
present invention, the arrangement of the speaker and the speaker receiver 77 can be any
diagonal position. It does not matter at the position.
[0147]
As described above, in the modification of the embodiment of the present invention, the
mounting area for arranging a plurality of speakers can be eliminated by substituting the speaker
and receiver 77.
[0148]
Further, in the embodiment of the present invention and in the second and third embodiments
and the modification, the arrangement positions of these speakers are described as being
arranged at diagonal positions, but strictly Depending on the design, it may be in a rough
position, or may be provided at four apex angles of a square-shaped casing.
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Also, the first casing 16, the first casing 160, the first casing 161, and the first casing 162 are
disposed on the side wall surface with respect to the side on which the display unit 10 is
disposed. Although the case has been described, it may be disposed on the front and back of each
case.
[0149]
Further, the value of the third filter 85 (F3) for listening to the equivalent sound in the left and
right ears described in the embodiment of the present invention is determined according to the
second embodiment and the third embodiment of the present invention. The present invention
may be applied to the embodiments and modifications of the above.
[0150]
It is a perspective view of the terminal in an embodiment of the invention.
It is a block diagram which shows the structure of the terminal of embodiment of this invention.
It is a perspective view showing the speaker position of the comparison terminal for comparing
with the terminal of an embodiment of the invention.
It is an image figure which shows the relationship between the two speakers of a comparison
terminal, the signal processing circuit which performs the signal processing of crosstalk
elimination, and a listener.
It is the image figure which showed the terminal of embodiment of this invention, and the
standing position of a vertical listener and a horizontal listener, and the sound signal which
reaches each user by 俯瞰.
It is an image figure showing relation with two speakers of a terminal of an embodiment of the
invention, a signal processing circuit which performs signal processing of crosstalk deletion, and
a vertical listener.
10-05-2019
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It is a perspective view of the terminal in a 2nd embodiment of the present invention.
It is a block diagram which shows the structure of the terminal of the 2nd Embodiment of this
invention.
It is the image figure which showed the terminal of the 2nd Embodiment of this invention, and
the standing position of a vertical listener and a horizontal listener, and the sound signal which
reaches each user by 俯瞰.
It is an image figure showing relation with two speakers of a terminal of an embodiment of the
invention, a signal processing circuit which performs signal processing of crosstalk deletion, and
a vertical listener.
It is a perspective view of the terminal in a 3rd embodiment of the present invention.
It is a block diagram which shows the structure of the terminal of the 3rd Embodiment of this
invention.
It is a perspective view of the terminal of the modification of embodiment of this invention.
It is an image figure which shows the position of the speaker in the conventional information
communication terminal, and the difference in a display content, and (a) is an image figure at the
time of performing a horizontal display especially when performing a vertical display.
Explanation of sign
[0151]
REFERENCE SIGNS LIST 1 information communication terminal 1 'information communication
terminal 100 information communication terminal 101 information communication terminal 102
information communication terminal 2 voice processing unit 20 voice processing unit 20
wireless processing unit 4 antenna 5 microphone 6 receiver 70 speaker 71 right speaker 72 left
speaker 73 upper right speaker 74 lower right speaker 75 upper left speaker 76 lower left
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speaker 77 speaker / receiver 81 first filter 82 second filter 83 first filter 84 second filter 85
third filter 90 subtractor 91 right subtractor 92 left subtractor 93 right subtractor 94 Left
subtractor 10 display unit 10 'display unit 11 control unit 12 CPU 13 ROM (memory) 14
operation unit 15 RAM (memory) 16 first case 160 first case 161 first case 162 first Case 17
second case 170 second case 171 second Case 172 second case 21 signal processing circuit 21
'signal processing circuit 27 listener 28 vertical listener 29 right horizontal listener 30 left
horizontal listener
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