US3830978A - Circuit for mixing four audio input signals to produce four audio output signals - Google Patents

Circuit for mixing four audio input signals to produce four audio output signals Download PDF

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Publication number
US3830978A
US3830978A US00269085A US26908572A US3830978A US 3830978 A US3830978 A US 3830978A US 00269085 A US00269085 A US 00269085A US 26908572 A US26908572 A US 26908572A US 3830978 A US3830978 A US 3830978A
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Prior art keywords
input
end terminal
potentiometer
potentiometers
mixing
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Expired - Lifetime
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US00269085A
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English (en)
Inventor
K Odagi
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • H04S3/02—Systems employing more than two channels, e.g. quadraphonic of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • H04S3/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution

Definitions

  • the mixing is accomplished through the use of four ring connected potentiometers with the audio input signals applied either to the midpoint of the potentiometers or to the connection point of two potentiometers.
  • the output signals are derived from the moveable terminals of the four potentiometers.
  • the present invention relates to a four-channel stereophonic device.
  • stereophonic devices In stereophonic devices, generally, four speakers are arranged in a definite configuration, and each of the speakers reproduces the output of one channel. In such a stereophonic device, the correct sound field cannot be obtained unless the four speakers are arranged correctly as prescribed.
  • the object of the present invention is to provide a stereophonic device which can reproduce a prescribed sound field regardless of the arrangement of the speakers.
  • FIGS. 1 to 3 show different arrangements of four speakers in a stereophonic device
  • FIG. 4 is a block diagram showing the fundamental construction of the four-channel stereophonic device of the present invention.
  • FIGS. 5 and 6 are electric circuit diagrams of embodiments of the present invention, illustrating mixing circuits actually used.
  • 1 denotes the listener(s)
  • 2, 3, 4 and 5 denote speakers.
  • four speakers 2 through 5 are arranged in a square with respect to the listener(s) 1.
  • FIGS. 2 and 3 like parts as in the FIG. 1 are desig nated by like reference numerals.
  • four speakers 2 through 5 are arranged in a diamond with respect to the listener(s) 1.
  • four speakers 2 through 5 are arranged in a rectangle with respect to the listener(s) 1.
  • numerals 6 to 9 denote input terminals of signals in four respective channels and numerals 10 to 13 denote the output terminals thereof.
  • Numerals 14 through 17 denote mixing circuits, one each of which is inserted in a signal transmission path. Each mixing circuit 14 through 17 mixes the outputs of adjacent channels properly in accordance with the arrangement of the speakers.
  • FIGS. 5 and 6 like parts as in FIG. 4 are designated by like references.
  • the mixing circuits 14 through 17 in FIG. 4 are constituted by four variable resistors 18, 19, 20 and 21 having equal characteristics, which are connected in a series loop form and whose connectionpoints are designated by reference numerals 22, 23, 24 and 25, respectively.
  • Reference numerals 26, 27, 28 and 29 each designate respectively a tap provided at the midpoints of the resistors 18, 19, 20 and 21, respectively, and the input terminals 6, 7, 8 and 9 are connected to the taps 26,27, 28 and 29, respectively.
  • Reference numerals 30, 31, 32 and 33 denote movable contacts.
  • the movable contact 30 is connected to the output terminal 10, and provides movable contact-with the resistor 18.
  • the movable contacts 31, 32 and 33 are connected to the output terminals 11, 12 and 13, respectively, and provide movable contact with the resistors 19, 20 and 21, respectively.
  • signals W, X, Y and Z can be applied to the speakers 2 and 5 arranged in a diamond form as shown in FIG. 2 and thereby the prescribed sound field can be reproduced.
  • the signal W to be applied to the speaker 2 in FIG. 2 must be A B for reproducing the prescribed sound field.
  • the signals X, Y and Z to be applied to the speakers 3, 4 and 5 in FIG. 2 must be B C, C D and D A, respectively.
  • the constants b, c, f and g are determined in accordance with the ratio of the distance be tween the speakers 2 and 3 and the distance between the speakers 2 and 5. It will be understood from FIGS. 1 and 3 that the signal to be applied to the speaker 2 in FIG. 3 must be A bB. Similarly, the signals to be applied to the speakers 3, 4 and 5 in FIG. 3 must be B cA, C +fD and D gC, respectively. These demands are satisfied by setting the contacts 30, 31, 32 and 33 in contact with the resistors 18 to 21, respectively, at
  • the mixing circuits 14 to 17 in FIG. 4 are constituted by four variable resistors 34, 35, 36 and 37 connected in series to form a loop.
  • the input terminals 6 to 9 are connected to the connection points 38, 39, 40 and 41 of each two adjacent resistors.
  • Reference numerals 42, 43, 44 and designate movable contacts.
  • the movable contact 42 is connected to the output terminal 10, and provides a movable contact with the resistor 34.
  • the movable contacts 43, 44 and 45 are connected to the output terminals ll, 12 and 13, respectively, and provide movable contacts with the resistors 35, 36 and 37, respectively.
  • the operation of the device shown in FIG. 6 is similar to that of the device shown in FIG. 5.
  • the prescribed sound field can be reproduced by adjusting the mixing circuits regardless of the arrangement of the speakers.
  • the present invention is very advantageous when the arrangement of the speakers is restricted due to the shape of the room where the device is to be set, or by other conditions.
  • the present invention has many advantages. For example, special sound effects can be obtained by deliberately changing the sound field.
  • a four channel stereophonic device comprising four output terminals and four input terminals, said four input terminals being adapted to be connected to four stereo signal sources A, B, C and D, respectively, and first, second, third and fourth mixing circuits, the input of said first mixing circuit being connected to the input terminals adapted to be connected to said stereo signal sources D, A and B, the input of said second mix ing circuit being connected to the input terminals adapted to be connected to said stereo signal sources A, B and C, the input of said third mixing circuit being connected to the input terminals adapted to be connected to said stereo signal sources 8, C and D, and the input of said fourth mixing means being connected to the input terminals adapted to be connected to said stereo signals C, D and A, the relationship between the inputs and the outputs of said four channel stereophonic device due to said four mixing circuits being:
  • each of said four mixing circuits comprising a potentiometer provided with a tap at the midpoint thereof, two end terminals and a movable terminal, one end terminal of the first one of said four potentiometers being connected to one end terminal of the second of said potentiometers, the other end terminal of said second potentiometer being connected to one end terminal of the third of said potentiometers, the other end terminal of said third potentiometer being connected to the one end terminal of the fourth of said potentiometers, the other end terminal of said fourth potentiometer being connected to the other end terminal of said first potentiometer, said four input terminals being connected, re-
  • said movable terminals of said four potentiometers being connected to said output terminals.
  • a four channel stereophonic device comprising four output terminals and four input terminals, said four input terminals being adapted to be connected to four stereo signal sources A, B, C and D, respectively,
  • first, second, third and fourth mixing circuits the input of said first mixingcircuit being connected to the input terminals adapted to be connected to said stereo signal sources D, A and B, the input of said second mixing circuit being connected to the input terminals adapted to be connected to said stereo signal sources A, B and C, the input of said third mixing circuit being connected to the input terminals adapted to be connected to said stereo signal sources B, C and D, and the input of said fourth mixing means being connected to the input terminals adapted to be connected to said stereo signals C, D and A, the relationship between the inputs and the outputs of said four channel stereophonic device due to said four mixing circuits being:

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Algebra (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Physics (AREA)
  • Pure & Applied Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Stereophonic System (AREA)
US00269085A 1971-07-08 1972-07-05 Circuit for mixing four audio input signals to produce four audio output signals Expired - Lifetime US3830978A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5053571 1971-07-08

Publications (1)

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US3830978A true US3830978A (en) 1974-08-20

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US (1) US3830978A (enrdf_load_stackoverflow)
CA (1) CA965355A (enrdf_load_stackoverflow)
FR (1) FR2144897B1 (enrdf_load_stackoverflow)
GB (1) GB1399511A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952156A (en) * 1972-09-07 1976-04-20 Xerox Corporation Signal processing system
US3984636A (en) * 1975-03-06 1976-10-05 Koss Corporation Quadraphonic headphone with ambience programmer
US3997725A (en) * 1974-03-26 1976-12-14 National Research Development Corporation Multidirectional sound reproduction systems
US4121059A (en) * 1975-04-17 1978-10-17 Nippon Hoso Kyokai Sound field expanding device
US4204092A (en) * 1978-04-11 1980-05-20 Bruney Paul F Audio image recovery system
US4232190A (en) * 1978-02-06 1980-11-04 Laiacona Michael N Apparatus for combining phonograph signal with auxiliary audio signal

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HU165189B (enrdf_load_stackoverflow) * 1972-12-28 1974-07-27

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3082295A (en) * 1959-12-08 1963-03-19 All Union Res Inst Of Cinemato Panoramic mixer
US3110769A (en) * 1959-01-17 1963-11-12 Telefunken Gmbh Stereo sound control system
US3170991A (en) * 1963-11-27 1965-02-23 Glasgal Ralph System for stereo separation ratio control, elimination of cross-talk and the like
US3632886A (en) * 1969-12-29 1972-01-04 Peter Scheiber Quadrasonic sound system
US3686471A (en) * 1969-11-28 1972-08-22 Victor Company Of Japan System for recording and/or reproducing four channel signals on a record disc
US3708631A (en) * 1970-06-08 1973-01-02 Columbia Broadcasting Syst Inc Quadraphonic reproducing system with gain control

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3110769A (en) * 1959-01-17 1963-11-12 Telefunken Gmbh Stereo sound control system
US3082295A (en) * 1959-12-08 1963-03-19 All Union Res Inst Of Cinemato Panoramic mixer
US3170991A (en) * 1963-11-27 1965-02-23 Glasgal Ralph System for stereo separation ratio control, elimination of cross-talk and the like
US3686471A (en) * 1969-11-28 1972-08-22 Victor Company Of Japan System for recording and/or reproducing four channel signals on a record disc
US3632886A (en) * 1969-12-29 1972-01-04 Peter Scheiber Quadrasonic sound system
US3708631A (en) * 1970-06-08 1973-01-02 Columbia Broadcasting Syst Inc Quadraphonic reproducing system with gain control

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Four Channels and Compatibility, by Scheiber, AES Preprint, October 1970. *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952156A (en) * 1972-09-07 1976-04-20 Xerox Corporation Signal processing system
US3997725A (en) * 1974-03-26 1976-12-14 National Research Development Corporation Multidirectional sound reproduction systems
US3984636A (en) * 1975-03-06 1976-10-05 Koss Corporation Quadraphonic headphone with ambience programmer
US4121059A (en) * 1975-04-17 1978-10-17 Nippon Hoso Kyokai Sound field expanding device
US4232190A (en) * 1978-02-06 1980-11-04 Laiacona Michael N Apparatus for combining phonograph signal with auxiliary audio signal
US4204092A (en) * 1978-04-11 1980-05-20 Bruney Paul F Audio image recovery system

Also Published As

Publication number Publication date
FR2144897A1 (enrdf_load_stackoverflow) 1973-02-16
DE2232909B2 (de) 1976-06-10
CA965355A (en) 1975-04-01
DE2232909A1 (de) 1973-01-18
GB1399511A (en) 1975-07-02
FR2144897B1 (enrdf_load_stackoverflow) 1976-05-14

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