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JPS5119762

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DESCRIPTION JPS5119762
? Stereo device O Japanese Patent Application No. 46-94605 [Phase] Application No. 46 (1971)
published on November 26 48-15501 @ Akira 48 (1973) Feb. 27 Priority claim [Phase] June 10,
1971 [Phase] United States of America ? 1517900 Inventors of the United States of AmericaDep Bafra-United States of America-Merion Station-State of Merion-Road 110 Applicant Dynaco
Incorated [Phase] Attorney Attorney Yuasa Yuasa 3 outside 2, detailed description of the
invention The present invention relates to the improvement of a sound reproduction system.
According to the invention, the left and right front speakers respond without changing the stereo
signal using two amplifiers. This point is the conventional method. Two rear speakers are added
to this conventional scheme. These are placed to the left and right of the listener and the left one
is driven by the left channel's signal minus half of the right channel's signal and the right one is
minus the left channel's signal from the right channel's signal. Driven by Therefore the common
in-phase components of these two channels are subtracted by 6 db at both speakers, but the
signal components representing the background are summed if they are not in phase at both
speakers. FIG. 1 shows a two-channel stereo source to derive the output signals designated L and
R for the left and right channels, respectively, of the stereo signal. The sound source 11 may be a
conventional sound source such as a disk record or magnetic tape or a standard stereo signal as
extracted from a stereo FM multiplex receiver. In the embodiment of FIG. 1, the right and left
channels taken from the sound source 11 are applied to the input terminals of the stereo
amplifiers 12 and 13 which have the conventional, respectively grounded signal output
terminals. The right and left channel outputs of the amplifiers 12 and 13 are sent to a speaker
21.22 ░ 23, 24 placed at the corner of the square plane 25 generally bounded by the wall of the
room [111 111] EndPage: 1 . Speakers 21 and 22 are located in front of the face 25 so that
listeners inside the face 25 are generally positioned to face them, and speakers 23 and 24 are
located behind the face 25 to be behind the listener Be done. Loudspeakers 21-24 may be
unnecessary but have matching impedance characteristics as long as front speakers 21 and 25
and rear speakers 23 and 24 are paired. According to the embodiment of FIG. 1, the speakers 21
and 22 only respond to the output signals of the amplifiers 12 and 13, respectively.
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Left and right channels (this signal inputs the output signals of the amplifiers 12 and 13 to the
respective input terminals of the speakers 23 and 24 and grounds the other terminals of these
speakers via the T response network 28 and the impedance 29) Subtractively in the speakers 23
and 24 with a crossover of The impedance 29 has a value corresponding to the impedance of
either of the matched speakers 23 and 24 to achieve a crossover of -6 db. For this purpose, the
impedance 29 may be a resistance if the speakers 23 and 24 have an impedance response to a
substantially flat frequency over the entire audio spectrum, or may be a circuit that matches the
impedance characteristics of the speakers 23 and 24. In other cases, the impedance 29 may be a
speaker having characteristics matched to the impedance characteristics of the speakers 23 and
24. The crossover is theoretically variable in the relative crossover between these two channels,
so that the response for the speakers 23 and 24 is respectively K as a constant between O and 1
(L?KR) If it is represented by R-KL), it becomes different from 1 6 db. In practice, the value of K
is between 0.25 and 0.75, and = 0.5 for -6 db crossover. The negative crossover from the right
channel to the left rear speaker 23 and from the left channel to the right speaker -24 is with the
speakers 23 for the left and right channels in order to simulate the echo characteristics of the
wall of the concert hall where the stereo signal was originally recorded. Give a difference to 24.
Further, the excellent signals extracted from the speakers 23 and 24 are from the left and right
side walls of the concert hall. [111111] The amplitude of the signal extracted from the rear
speakers 23 and 24 is smaller than the signal extracted from the speakers 21 and 22. This is
desirable because the audience is generally located towards the plane 25 near the speakers 23
and 24 and away from the speakers 21 and 22. The ratio of responses of the front and rear
speakers can be varied relative to one another by controlling the value of the resistance of the
network 28, if desired. The circuit 28 comprises three resistors 31. 32. 33 which control the
amplitude of the sound from the front speakers 21 and 22 relative to the rear speakers 23 and
24 to those located behind the face 25. Furthermore, the circuit 28 can make the amount of
negative cross coupling between the left and right channels and the speakers 23 and 24 the
same.
The resistors 31-33 are interlocked so that their values are changed together and always the
same regardless of the direction of movement of the controller of that value. The resistors 31-33
increase the amount of attenuation of the rear speakers to allow the audience to sit closer later.
The position of the listener is close to the center of the room by four speakers with no
attenuation and with the same efficiency. If the value of impedance 29 is different from that of
speakers 23 and 24, then the value of resistor 33 always remains equal to the value of resistors
31 or 32 multiplied by the impedance ratio of impedance 29 to speaker 23 or 24 Be done. The
same monophonic signal is applied to the input terminals of amplifiers 12 and 13 in order to
balance the response of the speakers 21-24 such that the response of the left speakers 21 and
23 is the same as the response of the right sleds 22 and 24. The normally closed spring biased
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switch 27 is opened to test if these speakers are balanced, and it determines whether the listener
can hear the sound from any of these speakers. As the speakers 21-24 are balanced, the same
signals are applied to their respective ones and are connected as different pairs so that they can
not hear the sound from them. If it is desired to pause the speakers 23 and 24 and output stereo
signals only from the speakers 21 and 22, the switches 35 and 26 may be opened. As the left and
right sides take out a louder sound from the front [111111] EndPage: When taking a sound with
two characteristics, this method crosses +6 db as shown in FIG. To mix the left and right channels
positively with over: This can be modified. The right and left stereo channels taken from source
11 before entering amplifiers 12 and 13 in FIG. 2 are fed into mixing circuit 37 which includes
resistors 38, 39 and 40. Resistors 38 and 39 are respectively connected to the left and right
output channels of the stereo sound source 11 and to the input terminals of the amplifiers 12
and 13 and a resistor 40 spans the input terminals of these amplifiers. Each resistor 3B-40 has
the same value to provide a positive 6 db crossover between the left and right channels, so that
the output signals of amplifiers 12 and RL13 are (L +-) and (R + -N, respectively). It is represented
by). When the amount of positive cross mixing between speakers 21 and 22 should be different
than 6 db, the value of resistor 3B-39 is changed accordingly.
The output signals of the amplifiers 12 and 13 are applied directly to the terminals of the
loudspeakers 21-24 as in FIG. In the circuit of FIG. 2, the crossover between the rear speakers is
6 db, whereby the value of the left and right rear impedance 29 is made four times the
impedance of each of the speakers 23 and 24 so that the value of resistor 33 is always resistor
31 Or it will be 4 times 32. The average response of the rear speakers 23 and 24 is one third of
that of the front speakers 21 and 22 due to the impedance 29 having four times the impedance
of each of the speakers 23 and 24. Since the right and left signals are applied to these speakers
with the same relative amplitude as in the system of FIG. 1 in the system of FIG. 2, directivity of i
degrees is obtained from the speakers 23 and 24 as in the embodiment of FIG. . However, the
responses from the speakers 21 and 22 of FIG. 2 provide enhanced directivity. The reason is that
the left and right channel responses are added in the speakers 21 and 22. In FIG. 3, five speakers
are connected to each other, and the fifth speaker 41 has the function of the impedance 29 in
FIGS. The corner speakers 21-24 respond to the output signals [111111] of the amplifiers 12
and 13 as described in FIG. 1 or FIG. Except for the fact that 21 and 22 of these loudspeakers are
positioned at a slight angle to the front of the surface 25, the others are the same as in the
previous embodiment. The fifth speaker 41 is connected in exactly the same way as the
impedance 29 of FIGS. 1 and 2 and is placed close to the front of the surface 25 and on the
middle side of the left and right sides of the surface 25. The loudspeaker 41 responds to the sum
of the currents applied to the loudspeakers 23 and 24 and therefore gives a response
proportional to the sum of the left and right channels, ie (L + R). Since the response of the
speaker 41 is proportional to the sum of the left and right channels, its acoustic output is
considered to be similar to the output from the front speaker in the diamond arrangement. Using
one speaker as the impedance 29, it can also be placed on the listening surface remote from the
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surface 25 as shown in FIG. In this case, four corner speakers are placed in one room, and the
fifth speaker, ie, 42 in FIG. 4, is placed in another room which does not require stereo
reproduction. Since the speaker 42 responds to the sum of these two channels, all of the
information in the stereo source is reproduced by the speaker 42.
According to another embodiment of the invention, mixing of +6 db for the front speakers and
mixing of -6 db for the rear speakers connect the autotransformers 51 and 52 to the output
terminals of the amplifiers 12 and 13 as shown in FIG. Given by Amplifiers 12 and 13 respond
directly to the left and right channels of the stereo signal derived from source 11, as shown in
FIG. 1, so that no mixing occurs in their input circuits. The autotransformers 51-52 are designed
to have the appropriate frequency-amplitude response for the required audio spectrum and have
terminals 48 and 49 connected to the output terminals of the amplifiers 12 and 13, respectively.
Each of the autotransformers 51 and 52 has three equally spaced taps and terminals not
connected to the winding terminals opposite to the connection terminals of the amplifiers 12 and
13. The center taps 53 and 54 of the transformers 51 and 52 are grounded together, and a
voltage equal to L and B is generated at the taps 55 and 56, the terminals and the ungrounded
terminals 59 and 60 of the terminal 62 respectively. The front left speaker 21 is connected
between the output terminal of the amplifier 111 and the tap 58 of the transformer 52 and the
terminal of the speaker 22 of the amplifier 13 to provide a positive 6 db mix [111 111] EndPage:
3 It is connected between the output terminal and the tap 57 of the transformer 51. Therefore,
the voltages applied to the speaker 21 and R22 are represented by CL-(-T-) and L (R-(-T-)),
respectively, that is, RL (L + .SIGMA.) And (R + i). The terminals of the speaker 23 are connected
between the output of the amplifier 12 and the tap 56 of the transformer 52 and the speaker 24
is connected to the output of the amplifier 13 and the transformer 51 in order to provide a cross
coupling of one 6 db for the speakers 23 and 24. It is connected between it and the tap 55.
Speakers 23 and 24 respond to the voltage applied across their terminals to the desired negative.
A transformer configuration may be used by using FIG. 6 in a circuit where the rear speakers are
given a cross coupling of 1 6 db and the front speakers are not given cross coupling. In FIG. 6,
the output terminals of amplifiers 12 and 13 having input terminals driven only by the left and
right channels of source 11 are connected to speakers 21 and 22 in parallel with tapped
autotransformers 61 and 62. The transformers 61 and 62 have desired frequency-amplitude
characteristics across the audio spectrum to obtain the desired response from the speakers 2124.
The transformers 61 and 62 are connected between the output of the amplifier 12 and the tap
64 of the transformer 62 for the center taps 63 and 64 respectively. The RL response for the
speaker 24 is obtained by connecting its terminal between the output of the amplifier 13 and the
tap 63 of the transformer 61. The scheme of FIGS. 1-6 can be driven by a specially recorded
stereo signal. This particular recording configuration considered most suitable is by placing the
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microphones at the four corners of the concert hall as shown in FIG. In FIG. 7, the sound source
FllllllN 71 is placed in front of the hole and the corner microphones 71-75 are placed between
the sound source 71 and the back wall of the hole. The front microphones 72 and 73 are
arranged such that their apertures are close to the left and right images of the sound source 71.
Microphones 74 and 75 are positioned after the holes and so that their apertures face back and
respond to echoes from the back wall. By placing the microphones 72-75 at the four corners to
convert the sound as shown in FIG. 7, the linear combination of the responses of the four
microphones can limit the effective response for the four walls. . Therefore, it is assumed that the
responses of the microphone ?2-75 are represented by A, B, C, and D, respectively. The forward
response is defined by the sum (A + B) of the sounds converted by the microphones 72 and 73,
the acoustic energy on the left is defined by the sum of the sounds converted by the microphones
72 and 74 (A + C), and the right side is the microphones 73 and 75 And the energy after that is
defined by the difference between the microphones 74 and 75 (C-D). The acoustic energy for the
back wall is a difference (C-D) because it contains information such as clapping, noise of the
audience, more accurate, for example, by having random phase and taking differences. It is
defined. By defining the front, rear, left and right sides as described above, the left and right
channels can be formed as if these microphones were arranged as a diamond array. Therefore,
the left channel of the stereo signal can be defined as the signal converted from the left, front
and rear of the hole, and the right channel can be defined as the sum of the front and right tones
minus the rear. By appropriate substitution, the left and right channels can be represented by the
responses from the microphones 72-75 as equations (1) and (2). One possible scheme for
forming the left and right channel signals is shown in FIG.
The signals from the microphones 72-75 are applied to amplifiers 76-79 each having an output
terminal for the ground potential. The output signals of the amplifiers 76-79 having the same
relative phase as the signals from the microphones 72-75 are applied to the synthesis matrix 81.
Matrices 81 each include resistors 82-89 of the same value. The resistors 82-87 form a pair of
summing circuits which provide input signals to the amplifiers 91-93. Amplifier 91 is responsive
to the A and B output signals of amplifiers 76 and T7 connected through resistors 82 and 83 to
derive an (A + B) signal indicative of [111111] EndPage: 4 of the sound in front of the hole.
Amplifier 92 is responsive to the output signals of amplifiers 76 and 78 connected through
resistors 84 and 85 to produce an (A + C) signal indicative of the left hand sound. The sound on
the right is extracted by the amplifier 93-connection of its input terminals via the resistors 86
and 87 respectively to the output terminals of the amplifiers 77 and 79. To produce the latter
signal (C-D): The output terminals of amplifiers 78 and 79 are grounded via resistors 88 and 89
and connected to the positive and negative input terminals of differential amplifier 94. In order
to extract the left channel, the front, left and rear output signals of the amplifiers 91 ░ 92 and
94 are added by the summing circuit 95 to take out the output signal according to (1) L = 2A + B
+ 2C?D. The right channel is output by summing the output signals of the amplifiers 91 and 93
and the output of the amplifier 94 inverted by the inverter 96, for example, in a summing circuit
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97. Therefore, the summing circuit 91 is equivalent to the response of the signal output at the
output terminal of the amplifier 94 minus the sum of the responses from the amplifiers 91 and
93 in order to output one output signal according to (2) R = A + 2B-C + 2D. An output signal is
output, where A = a sound from the left front microphone B = a sound from the front right
microphone C = a sound from the left rear rear microphone D = a sound from the rear right
microphone. The left and right channels of the stereo signal at the output of circuits 95 and 97
are fed to a suitable two channel output device 98. The output device 98 may be a conventional
tape recorder, a stereo disc recorder, a two channel stereo device such as a stereo signal station.
If a two-channel stereo signal having the characteristics shown in equation (1) is added as shown
in FIGS. 2 and 5 to the reproduction circuit with a mix of +6 db for the front speaker and then to
the rear speaker followed by that of -6 db. Good results are obtained for the separation between
In particular, each corner speaker has a response that is itself dominant and has a component
that is common to the responses of two adjacent speakers, but no component that is common to
the dominant components of the opposite corner speakers. For example, the Subi [111111] car
21 in FIG. 2 extracts the dominant response associated with the corner microphone on the left
front of the hole in FIG. 7 and a response with a smaller amplitude than the response from the
front right and left rear of the hole. , Eliminate the components from the microphone in the
corner behind the right of the hole. This is particularly convenient for obtaining directional
effects while keeping the sound from all sides of the listening surface intact. If the left and right
channels of source 11 are mathematically represented by equations (1) and (2), the scheme of
FIG. 2 gives output responses to the four speakers according to the following equation. L one day
= 5-A + 2B + 3-C varnish beaker 21 (3) 222R + then = 2A + 5-B + 3-D = speaker 22 (4) 222L Once
= 3-A + 5-C-2D = speaker 23 (5) 222R-"q = 3 When analyzing the B-2Dd-D varnish beaker 24 (6)
222 Equations (3)-(6), the response for each corner lacks the dominant response of diagonally
opposite corners and is adjacent It contains smaller amplitude components for the corners.
Furthermore, the response for the front speaker is greater than the rear speaker, and the desired
result is obtained because the audience is generally closer to the rear speaker than the front
speaker. While specific embodiments have been described above, these variations are easy. For
example, a balancing circuit similar to that shown in FIGS. 1-4 can be used for FIGS. Further, the
mixing of +6 db between the left and right channels shown in FIGS. 2 and 5 can be obtained by
adding the responses of circuits 95 and 97 before being applied to the output device 98 as
shown in FIG. This feature is often unnecessary, as it is incompatible with conventional stereo
systems having only two speakers. In the case of direct recording of the signals from the
summing circuits 97 and 95, it is well compatible with the conventional two-speaker system. The
recording system of the present invention has been described in terms of the necks 1) and (2) to
give L and R signals, but the change in the constant is L = A power + CD2CR = 7 ten B?? + D.
The 50 cross-couplings denoted by the constant ? are generally canceled out by the
corresponding negative cross-couplings in the reproduction scheme of FIG. 2, known by
Quadaptor (T, M) [111 111] EndPage: 5.
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This means that if the front left signal is recorded, then the right signal is not reproduced and
likewise for the front signal the rear left signal is not reproduced. There is a complete separation
between A and B with a separation of 16 db for C and D for pure left signals, and only the human
power signal for pressure release is more largely separated in the quadraptor than before Ru.
This is acceptable because the listener listens to the rear speakers at a wide angle and the
inversion of the phase later on spreads the separation. The 50% cross couplings of equations (1)
and (2) are not critical and can be modified. For example, the back and forth separation may be
equalized, and this can be optimally achieved with a cross feed 2-3 or 26, 8%. The separation
before and after the phase shift is about 11 db. Therefore, the matrix is as follows. 1L = A +-B + CD (7) 21R share-A + B--C + D (8) 2 If expressions (7) and (8) are used, a difference in directivity is
better than 10 db before and after about 10 db from left to right [1111111 This matrix is
optimal for quadraptors and is quite suitable for conventional stereo or monophonic use. The
26.8% cross-field value is optimal, but generally the cross-field range should be adapted to the
desired sound effects and to suit the various microphone positions etc.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of one embodiment of the
reproduction system of the present invention, FIG. 2 is a circuit diagram of another embodiment,
FIG. 3 is a modification of FIG. 1, and FIG. 1 and 2 are circuit diagrams when another speaker is
attached, FIG. 5 is a modification of FIG. 1, FIG. 6 is a circuit diagram of another embodiment, and
FIG. 7 is a system of FIGS. FIG. 8 is a circuit diagram of the microphone circuit used in the hole of
FIG. 7; 11 ииииииииииии Stereo sound source, 21?24, 41 ░ ииииииииииииииииии Speaker, 25 ииииии Listening surface,
72-75 иииииииииии Microphone. [Phase] Citation of Japanese Patent Application Publication No. 4729329 [111111] EndPage: ?
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