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JPS52110602

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DESCRIPTION JPS52110602
Specification · 1 title of the invention
Signal converter
4) Detailed Description of the Invention A signal without localization information (for example, a
monophonic signal, a certain inclusion is an individual channel signal in a multichannel stereo
signal, etc.) is used as an input signal to localize the sound signal. Localization of the sound image
similar to the case where the sound source corresponding to the input signal is present at a
specific position (or direction) in the intended space, by the reproduced sound field by a plurality
of speakers arranged in the space It is intended to expand the localization of the sound image in
the case where a stereo sound field is formed with two speakers and listening by forming a
sound image localization load that can be obtained, and also to the outside of the positions of the
two speakers. Obtain a reproduction signal that can give the listener the required sense of sound
localization for the stereo sound field expansion device configured as well as various other
devices. In this case, any given signal mote is given taking into consideration all the transfer
characteristics between the sound source in the recording sound field and the recording device,
and the transfer characteristics between the reproduction sound source and the listener in the
reproduction sound field. Signal conversion (signal-1ii) conversion 1 is performed to obtain a
signal having the required reproduction signal mode from the signal having the signal. As an
example of the above-described confidence% conversion, for example, Japanese Patent Laid-Open
No. 50-1! Although the items relating to the sound localization method which is clearly oon- in
the 5oon publication can be mentioned, if it is included in the example described in this
publication, it is in the space intended to localize the sound image If it is assumed that the sound
source is present at a specific position of, the condition for one ear signal of the user to be given
to the listener is also obtained by the sound field reproduced by a plurality of speakers arranged
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in the space iEndPage: 1 Since the above conditions are directly applied to the monaural sound
that is to be the original folding to obtain signals to be supplied to a plurality of speakers, when
the previously proposed method is implemented, It is necessary to divide the frequency band to
be subjected to double-length conversion into a plurality of parts, and to convert the signal for
each of the divided frequency bands or to obtain the transfer characteristics at both ears 1 from
the required electric source To have characteristics) 71I et al. Is hitting on its configuration
addition to means complicated structure is needed, such as with a plurality of bandpass filters, it
becomes what adjustments are difficult, was casing. There were problems such as lack of high
fidelity. Therefore, as a result of various researches conducted by the applicant company in order
to obtain an apparatus capable of solving various problems in the case of the above-mentioned
example well, an input signal having no signal for localization information has been previously
obtained. Assuming that the sound source corresponding to the input double length is present at
a specific position in the space intended to localize the sound image, the pinaural to be obtained
as an output signal using the pinaural signal generator. A first signal conversion device capable
of obtaining a pinaural signal similar to the signal as an output signal, and the pinaural signal
obtained from the first signal conversion device described above as an input signal, and the
output signal forms the entire reproduction sound field (A sound statement given to a listener's
both ears through the space from the plurality of speakers when supplied to the plurality of
arranged speakers Cascade connection with a second signal conversion device capable of
obtaining an output signal in the form of a signal such that crosstalk to be generated in the
reproduction sound field has been canceled in advance so as to obtain an acoustic signal of the
form corresponding to the An apparatus of the above construction was completed, and a patent
application was filed on February 27, 1977 regarding the invention.
According to the above-mentioned apparatus of the present applicant's company, the structure is
simple and the adjustment is easy as compared with the apparatus according to the abovementioned prior art, and the sword also obtains an output signal with high fidelity. It has been
possible to provide a sound image localization apparatus having various features that can be
performed, and a stereo sound field expansion apparatus as its application. 3- By the way, in the
configuration of the above-mentioned prior-art apparatus, the first signal conversion device and
the second signal conversion device connected in cascade each have a predetermined frequency
response to obtain a required signal conversion device. The circuit arrangement is composed of a
filter having the characteristics and a delay circuit (phase shift circuit) for giving a predetermined
clear delay to the signal, but it is possible to use, for example, a wide frequency band signal to be
reproduced. With respect to the expensive delay circuit which is required to provide the delay
delay of a relatively large delay valve, it is necessary to It is needless to say that when it is
necessary to individually prepare each of the second signal conversion devices, the number of
parts and the number of man-hours increase, as well as the circuit configuration becomes
complicated and the devices become expensive. So the improvement was requested. The present
invention, for example, includes a signal conversion device in Japanese Patent Application No.
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50-106505 and Japanese Patent Application No. 50-114234, and a signal conversion device
between signals in different reproduction signal modes, including the devices of the abovementioned prior applications. To achieve a simple configuration, each with excellent
performance! The present invention has been made for the purpose of making it possible to
provide an apparatus inexpensively, and the specific contents thereof will be clarified below with
reference to the attached drawings. First, the case where the signal conversion device of the
present invention is applied to a stereo sound field expansion device will be described. FIG. 1
shows the transfer characteristics between the two speakers 1.2 arranged on the front of the
listener M and the ears of the listener M-B1 and a virtual reproduction sound source 11.2 at the
time of expansion of the sound field. Transmission characteristics Ai + B1h between the listener
and both ears of the listener V, the signal LspIRsp of the speakers 1 and 2, the signal Lspi + R day
pi of the virtual reproduction sound source 11 + 21, and the both-ears signal of the listener -t'Re'L @ im Although it is a figure which shows relationship, such as eyelid 1, in this specification, in
order to demonstrate easily, the transmission characteristic and the speaker 2 in the left ear 1 of
the listener M and the listener M are illustrated like 1st illustration. It is assumed that the
transmission characteristics of the right ear 1 of the listener M and the listener M are both A, and
the transmission characteristics of the right ear 1 of the listener from the speaker 1 and the
transmission of the left ear 1 of the listener from the speaker 2 Assuming that both the
characteristics are B′′C, similarly, the virtual reproduction sound source 11 ° 21 Also, the
transmission characteristics between the listener and the left and right ears of the listener are
shown as EndPage: Ai, Bi identical to each other as shown in FIG.
Referring to FIG. 1, the signals of the two speakers 1 and 2 disposed in front of the listener M are
respectively LBp + Rsp, and between the speakers 1 and 2 and both ears of the listener M. In a
reproduction sound field whose transfer characteristic is shown by matrix (AB,) A, the following
relationship (1) is established between the signal Lap + Rsp of the speaker l + 2 and the left ear
signal − and the right ear signal Re of the listener M: The relationship as shown in the equation
is established. Also, the relationship between the virtual sound source 11.21 at each meeting Iapi
* horse p1 of the virtual sound source 11.21 and the listener M's left-earing party Lei and the
right-eared signal horse 1 in a state where the stereo sound field is expanded is a virtual sound
field. If the transfer characteristic (σ) is a matrix (A 4 B 1), it is expressed by the following
equation (4) of IA 4. By the way, the binaural signal L61.N of the listener M in the state where
the stereo sound field is expanded. Rθ 1 is a speaker l. If the equation (1) is modified with 穐 =
−1 ° −knee 1 in the above equation (1), the above equation (3) can be obtained. Substituting
the equation (3) into the equation (2), the equation (4) is obtained. In the signal conversion
device according to the present invention, this equation (4) uses the input signal as RspilLBpi and
the output signal tRapILIl + 1), and applies it to the stereo sound field expansion device to obtain
the input signal Rap1-Lepi and the output signal. FIG. 2 is a diagram showing the relationship
between @RspeLsp, and FIG. 2 shows a block diagram of a specific configuration of the stereo
sound field expanding device according to the equation (4) described above. In FIG. 2, xll2 is an
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input terminal, 7-state, 14 is an output terminal, 7 * B'd subtractor, 11 ° 12 is an adder, and 3
to 619 and 10 are diagrams respectively. A circuit configured to have a transfer characteristic as
described in the inside of the box, the circuits comprising a filter having a required frequency
response characteristic and a delay circuit having a required delay time It is composed of one or
a combination of both. In FIG. 2, A, Ai, and B, Bi, etc. are the transfer characteristics in the
reproduction sound field described above and the transfer characteristics in the virtual sound
field, respectively, and the input 'ij I @ pi is supplied to the input end +11 When the input signal
Rspi is supplied to the input terminal 12, the output signal T- @ p is output to the output terminal
+3, and the output signal -p is output to the output terminal 14. In the circuit arrangement
shown in the second illustration, the configuration between the input terminal +11 and the
output terminal 13 + 14 and the configuration between the input terminal +12 and the output
terminal 14 ° 13 are respectively symmetrical, so One input 1M supplied to the terminal.
If you know how to use the sword 18-output to the output terminal of 10,000, it is obvious how
the other input signal supplied to the other input terminal is output to the other output terminal
As an example, here, the entire explanation is only given for the point that the input signal '¥ 4
Lspi is supplied to the input terminal +11 and the output signal Lsp is output to the output
terminal 13 and the input terminal +12 is input. A detailed description of the signal Rspi being
supplied and the output signal -F'Rsp being output to the output terminal 14 is omitted. The
input signal pi supplied to the input terminal +11 is made through the block 3 with the
characteristics of Ai / AA ij Lspi as (□) 400, which is the adder 11 and the block 5 and the @
This is given to the subtracter 7 as its reduced number. The input number 5 given to the
subtracter 7 as a decrement is an output part from the adder 11, but it is EndPage: 3 and the
adder 12 is given. Here, the signal given to the adder n to the block 10) is the signal I (lpl and the
signal Lsp in the output signal to be given to the block 12 to the adder 12 described above,
respectively Rsp) Therefore, the signal sent to the output terminal 13 of the adder n is a signal of
the sum of the output signal from the block 3 described above and the output signal from the 10
blocks, etc. The signal LBp shown by equation (4) is obtained. the above! --- In the stereo sound
field expanding apparatus constructed by the signal converting apparatus of the present
invention shown in the second figure, the circuit obtained by cascade connection of the circuit of
(1) and the circuit of (,-) characteristic Characteristic (-1 is constructed by connecting a stereo
sound field expansion device (a virtual sound field simulator and a noise a stoke removal circuit
in the reproduction sound field cascaded as an application example of a single applicant
company 1959 1 device) It is a stereo sound field expansion apparatus, and it is essential to
provide it in the virtual sound field simulator in the attached drawing in FIG. Assuming that each
of the virtual sound field simulator and the crosstalk elimination circuit in the reproduced sound
field has its own required characteristics. Given person by causing respective configured to each
independent, whereas so as to obtain the output characteristics. In the signal conversion device
of the present invention, the requirement of the overall circuit obtained by the cascade
connection relation of the two circuit portions between the simulator portion of the virtual sound
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field and the crosstalk elimination circuit portion of the reproduction sound field in the
previously proposed device. Focusing on the characteristics, even if a part of the characteristics
required to be provided in 10,000 circuit parts is shared by the other circuit part, the required
characteristics can be obtained comprehensively. Specifically, block 5 (or 6I and block 9 [or] f)) in
FIG. 2 and all the characteristics as described above and those?
The cascaded connection relationship allows the circuit arrangement having the same function as
that of the previously proposed device to be configured as a simplified circuit arrangement.
Further, since the adders and subtractors to be added in the above configuration are inexpensive,
the addition does not cause a large increase. In the circuit arrangement of the second illustration,
it goes without saying that the circuit arrangement operates as a sound image localization
apparatus if only one input signal is provided. Now, in order to make each circuit part
constituting the circuit arrangement of the second illustration as a specific characteristic, as
described above, a filter having a required frequency response characteristic, a delay circuit
having a required time delay, etc. In the circuit arrangement shown in the second illustration, a
delay circuit 12-path (phase shift circuit) is generally required, but the configuration is largely
damaged, t becomes expensive, and the expensive one is a delay circuit 12-path (phase shift
circuit). It is also effective to configure to share only the delay (phase shift) circuit portion of the
circuit characteristics for obtaining the required characteristics. FIG. 3 is a block diagram of one
of the modified embodiments of the circuit arrangement shown in FIG. 2 from the viewpoint as
described above, which is described in FIG. Department). Each block 15 to 22 in FIG. 3 has a
characteristic as shown in the drawing and is a common circuit, and the overall input / output
characteristic is the same as that of the second example circuit arrangement. . The circuit
arrangement shown in FIGS. 2 and 3 described above is an example of the case where the signal
conversion device of the present invention is applied to a stereo sound field expansion device. As
a matter of course, the transfer characteristics of the provisional 4 reproduction sound field The
characteristics due to A and B (having a delay larger than -1, and FIGS. 2 and 3 show the case
where sharing of the circuit is performed under the conditions as described above. An example of
Therefore, the signal conversion circuit may be configured in association with the virtual sound
field and the reproduction sound field. The signal conversion apparatus according to the present
invention shown in FIGS. 2 and 3 described above has a relationship between the virtual sound
field and the reproduction sound field in the case of the belief conversion applied to the case as
shown in FIG. The circuit arrangement shown in the block diagram of FIG. 4 or 6 in the example
of the embodiment is a signal conversion applied to the case where the relationship between the
virtual sound field and the reproduction sound field is shown in FIG. 1 is an example embodiment
of the signal conversion device of the present invention. That is, in the circuit arrangement
shown in FIG. 5, the virtual sound sources 11 and 21 are connected along the line connecting the
two speakers 1 and 2 arranged in front of the listener M and the listener M in FIG. One
embodiment of the listener is a sense of localization of the sound image in a state of moving in
the direction of the arrow in the figure, and the signal conversion device having such a function
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is disposed close to the listener M, for example. The listener MK gives a feeling of localization of
the sound image as if it is far away from the listener = MK, and the listener is listened to the
orchestra played as far as the listener by the two speakers. It is effectively used when trying to
give the same sense of hearing or to give the same sense of hearing to the listener M [the
playback of the pinaural signal by the head phone.
By the way, the virtual sound source 1i, 2. In the case where the relative relationship between j,
the reproduced sound source 1.2 and the listener M is as shown in FIG. 5, that is, without
changing the direction of the sound source viewed from the listener M, 1 simple listener M and
the sound source In the case of changing the distance between the two and the listener M in the
case of changing the distance between them, the time difference based on the difference between
both ears of the listener M and the pattern of the frequency amplitude characteristics hardly
change, and the overall Km level changes. Therefore, the signal conversion device to be
configured based on the above intention is, for example, 15-by the circuit arrangement as shown
in FIG. In FIG. 4, 祁 and 24 are input terminals, 35136 is an output terminal, and 25 to 28 are
variable attenuators and phantoms. 30 is a subtractor, 31 and 32 are characteristics (-) all
circuits of the open cover of the listener M when the speaker is sufficiently far from the listener
M, 33. 34 is an adder, and the fourth illustration In the circuit arrangement of the above, the
variable attenuators 25 to 28 are adjusted in accordance with the distance between the listener
M and the speaker enclosure according to the distance between the virtual sound source. For
example, the variable attenuator 27.28 is a virtual sound source Xi + 21 and the listener The
variable attenuators QB and Q6 are adjusted corresponding to the distance between the speaker
2 and the listener M, respectively. For example, if the variable attenuators 27 and 28'6 are
adjusted to make the gain of the square be zero, in this case, the distance between the virtual
sound sources 11 and 21 and the listener M corresponds to the 00 state. Is a signal conversion
device when the signal of headphone reproduction signal mode such as pinaural sleeve number
is input, conversely to the above, the variable attenuator section, 26'ft adjustment, and the state
of the origin is zero Then, in this case, the distance between the 16-speaker II 2 and the listener
M corresponds to the state of 0, and the device changes from the signal in the speaker
reproduction signal mode of the speaker of any distance to the signal in the headphone
reproduction signal mode. It becomes a signal conversion device. In the signal conversion for
obtaining a signal in a state in which the virtual sound source 11 + 21 is moved on the line
connecting the listener M and the speaker my2 as in the circuit arrangement of the fourth
illustration described above, the signal reproduction for speaker reproduction. And a circuit for
signal conversion from the signal of the headphone playback signal mode to the signal session of
the speaker playback signal mode different from the signal of the headphone playback signal
mode from Is shared by all of them. If the circuit arrangement of the first illustration shown
above is used for two sets, the applicant company filed a patent application first, and different
speaker arrangements are applied in Japanese Patent Application No. 50-75209 "4-channel
stereo system by pinaural signal". It is self-evident that signal conversion for signals or signal
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conversion for headphones can be performed.
The sixth is the above-mentioned FIG. 3 with respect to the "multichannel stereo system" such as
Japanese Patent Application No. EndPage: 5 Application Nos. 50-106505 and 50-114234 filed
by the applicant company earlier. In the signal conversion device of the present invention, the
two signal conversion devices disclosed in the two cited patent applications can be shared with
each other by applying the method of signal conversion as described above. FIG. 6 is a block
diagram of the embodiment, in FIG. 6, 37 to 40 are input terminals, 41 to 52 are variable
attenuators to be adjusted according to the distance between the virtual sound source and the
listener, 53 to 64 are Variable attenuators to be adjusted corresponding to the reproduction
sound field, 65 to 76 are subtractors, 77 to 8 are reference numerals 59 to in the circuit
arrangement of the eighth illustration of the above-cited Japanese Patent Application No. 50106505. Same as the circuit shown by 70 Circuit shown the characteristics 89 to 92 are adders,
93 to 96 are output terminals. The characteristics that the circuits 77 to 8 days should have are
described and described in detail in the specification of the above-cited Japanese Patent
Application No. 50-106505, so a detailed description thereof will be omitted. Among the two
patent applications cited above, those of Japanese Patent Application No. 50-106505 are
recorded by microphones attached to a plurality of pseudo-classes arranged to face different
directions with respect to the circumferential direction. The listener in the playback sound field
powers the head by providing a plurality of 6 different pinaural signals or a plurality of pinaural
signals isometric to it to a plurality of playback sound sources (speakers) arranged in the space 1
Even if the sound image does not move unnaturally, this is a multi-channel stereo system in
which% bll, b12,. When the listener located at the center of the playback sound field placed at a
corner has the directions of both ears set to the directions of a pair of speakers placed at one
diagonal position, the left and right ears of the listener from four speakers The transfer
characteristic at 1 is shown. The above-cited Japanese Patent Application No. 50-114234 is a
headphone reproduction of signals of a plurality of speaker reproduction signal modes produced
by the means described in the specification of the aforementioned Japanese Patent Application
No. 50-106505. It is a system which converts it into a signal in the signal mode. Now, in the
signal conversion device according to the 19th aspect of the present invention shown in the
circuit arrangement of the sixth illustration described above, the cited Japanese Patent
Application No. 50-305 with respect to the input terminals 37 to 40 as gain all-zeros of the
variable attenuators 41 to 52. As in the case of the 106505 issue, when two sets of signals for
headphone reproduction signal mode are supplied, a signal for any number of tatami modes for
speaker reproduction is obtained at the output terminals 93 to 96, and one variable attenuator
53 to 64. When the signal for the speaker reproduction signal mode is supplied to the input
terminals 37 to 40 as in the case of the above-mentioned Japanese Patent Application No. 50114234 as the total gain of zero, two sets of output terminals 93 to 96 are provided. A signal in
the headphone reproduction signal mode is obtained.
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As described above, according to the signal conversion apparatus of the present invention shown
in the circuit arrangement of the sixth illustration, the signal conversion apparatus of six
different configurations which are separately configured in the two patent applications cited
above are shared. It can be The embodiment shown in the sixth example is for the case where the
direction of the virtual sound source is on the line connecting the listener and the playback
sound source, or when changing the direction of the virtual sound source, the sixty-first! It is
sufficient to combine 20 the means applied in FIG. 2 and FIG. 3 already described in the circuit
arrangement of ¥ 1, and further, in the circuit arrangement of FIG. 2 and FIG. , The variable
attenuators 2 and $ 28 ′ Th are connected to the input sides of the circuits 15 and 16 and the
reduced input side pressure variable attenuators 25. 26f, it is needless to say that the signal
conversion apparatus can be configured to be totally variable in distance between the virtual
sound source and the listener even in the circuit arrangement of FIG. 2 and the third circuit
shown in FIG. Also, although the circuit arrangement shown in FIG. 6 is an example for the case
of four channels, it goes without saying that it can be applied to the case of three channels or
multiple channels as well. As described above, it is described in detail that the sword λ et al. 7)
tfi) K, 1 shot, fJ-fold signal detection device, and a signal. Since it is possible to share the
configuration circuit required for the 6th replacement, it is possible to easily provide an
inexpensive signal conversion device with excellent performance used for various purposes. .
4. Brief description of the drawings FIG. 1 and FIG. 5 show the relationship between the
reproduced sound field and the virtual sound field EndPage: 6. FIG. 2 to FIG. 4 and FIG. 6 show
the signals of the present invention. FIG. 6 is a block diagram of one of six different embodiments
of the conversion device. 1, 2 @, X blink, li, 2l-(i sound source, modification 1 2, 2 a%, 37 to 400.
Input terminal, 13.14.35.36193-96. . Output terminal, L12133134.89 to 92 aa adder, 7s8,
29.30.65 to 761. Subtractor 25-28, 41-52.53-641. Variable attenuator, 3 to 6 * 9 sIQ *, 15 to 22
+ 31 g 32177 to 881. Circuit 23-9-/-EndPage equipped with required characteristics: 7
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