US3825684A - Variable matrix decoder for use in 4-2-4 matrix playback system - Google Patents

Variable matrix decoder for use in 4-2-4 matrix playback system Download PDF

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Publication number
US3825684A
US3825684A US00298933A US29893372A US3825684A US 3825684 A US3825684 A US 3825684A US 00298933 A US00298933 A US 00298933A US 29893372 A US29893372 A US 29893372A US 3825684 A US3825684 A US 3825684A
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signals
output
signal
channel
channel signals
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Expired - Lifetime
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US00298933A
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English (en)
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R Ito
S Takahashi
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Sansui Electric Co Ltd
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Sansui Electric Co Ltd
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Priority claimed from JP46084484A external-priority patent/JPS5127363B2/ja
Priority claimed from JP46086521A external-priority patent/JPS5127364B2/ja
Priority claimed from JP46087832A external-priority patent/JPS5127366B2/ja
Priority claimed from JP46089678A external-priority patent/JPS5127367B2/ja
Priority claimed from JP722145A external-priority patent/JPS5213404B2/ja
Priority claimed from JP47029332A external-priority patent/JPS5249721B2/ja
Priority claimed from JP47038407A external-priority patent/JPS5249723B2/ja
Application filed by Sansui Electric Co Ltd filed Critical Sansui Electric Co Ltd
Application granted granted Critical
Publication of US3825684A publication Critical patent/US3825684A/en
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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

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  • ABSTRACT apan A decoder for use in a four channel playback system Flledi Q 1972 includes a control unit and a variable matrix.
  • the con- [211 App] No 298 933 trol unit produces first and second control outputs which vary in oppositev directions in accordance with the phase relationship betweentwo channel signals.
  • Foreign Appllcatlon l y D The variable matrix includes a first variable matrix cir- Oct. 25, 1971 Japan 46-84484 uit for p oducing two outputs related to the front Oct. 30, 1971 Japan 46-86521 L a nels and having matrix coefficients controlled by Nov.
  • Another object of this invention is to provide an improved decoder capable of eliminating cross-talks between respective channels thereby improving the qualityof the sound field and greatlywidening the listening area.
  • a decoder for use in a directional sound system wherein at least four directional audio input signals are encoded into two channel signals and the two channel signals are decoded into at least four audiosignals corresponding to the audio input signals
  • the-decoder comprises a control unit responsive to the phase relationship between the two channel signals for producing first and second control signals,.
  • first matrix means connected to receive the two channel signals for producing at least two audio output signals corresponding to at least two directional audio input signals, said matrix means having variable matrix coefficients which are controlled by the first control signals
  • second matrix means connected to receive the two channel signals for producing at least two audio output signals corresponding to two remaining audio input signals, the second matrix means having variable matrix coefficients controlled by the second control signals.
  • the encoder 2 shown in FIG. 1 has a construction illustrated in FIG. 2. More particularly, directional audio signals FL and FR produced by the microphones MFL and MFR disposed at the front side of the original sound field 1 are supplied to a first resistive matrix circuit comprising serially connected resistors 11, 12 and 13. The directional audio signals RL and RR in the rear side of the original sound field l are applied to a second resistive matrix circuit 14 comprising serially connected resistors 15, 16 and 17.
  • FIG. 3 shows a block diagram of an improved decoder embodying the invention including a variable matrix circuit having a matrix coefficient whose magnitude is controlled in accordance with the phase difference between two channel signals L and R.
  • the phase discriminator constructed as above described operates to switch the left signal L by alternately rendering ON and OFF the first and second switching circuits 60 and 61 in response to the right signal R thereby discriminatingthe phase difference between the right and left signals R and L.
  • FIG. 6 shows the operating characteristic of the phase discriminator. showing that the first and'second control outputs ECl and EC2 vary symmetrically but in opposite directions about the rcfcrence level, which is equal to about +B/2 volts in the phase discriminator shown in FIG. 5.
  • phase difference between the left and right signals L and R equals 180 corresponds to a case wherein the sound is present only inthe rear, that is L -+jRL jARR and R jRR jA RL
  • the case wherein the phase difference between the signals L and R equals 90 corresponds to a case wherein sounds of the same level are present on the left hand and right hand sidesinthe front. as well as on the left hand and right hand sides in therear, that is L 1 j and R l j.
  • FIG. 7 shows the relationship between the left signal L and the right signal R. Solid lines show the case wherein signals FL and FR alone are present and thus the signals L and R are in phase. Dotted lines show the 1 case wherein signals RL and RR alone are present and
  • FIG. 8 shows a circuit diagram of a comparator I which is a modified embodiment of the control unit.
  • the first control output ECl derived out from the collector electrode of transistor 80 corresponds to log lL+Rl l LRl whereas the second control output EC2 derived out from the collector electrode of 7 posite directions about the reference value in substantially the same manner as the outputs of the phase discriminator as shown in FIG. 6.
  • a first matrix circuit 90 associated with the front channels comprises a first differential amplifier 91 including transistors 92 and 93.
  • the collector electrode of transistor 92 is connected to the first output terminal 27-1 of the matrix circuit while the collector electrode of transistor 93 is connected to the second output terminal 27-2 of the matrix circuit through an inverter 96 comprising a transistor 97.
  • a first control circuit 99 including a field effect transistor 100 is capacitively connected in parallel with a common emitter resistor 98 of transistors 92 and 93 which constitute the differential amplifier 91.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Algebra (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Physics (AREA)
  • Pure & Applied Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)
US00298933A 1971-10-25 1972-10-19 Variable matrix decoder for use in 4-2-4 matrix playback system Expired - Lifetime US3825684A (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP46084484A JPS5127363B2 (nl) 1971-10-25 1971-10-25
JP46086521A JPS5127364B2 (nl) 1971-10-30 1971-10-30
JP46087832A JPS5127366B2 (nl) 1971-11-04 1971-11-04
JP46089678A JPS5127367B2 (nl) 1971-11-10 1971-11-10
JP722145A JPS5213404B2 (nl) 1971-12-29 1971-12-29
JP47029332A JPS5249721B2 (nl) 1972-03-23 1972-03-23
JP47038407A JPS5249723B2 (nl) 1972-04-17 1972-04-17

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GB (1) GB1402320A (nl)
NL (1) NL159558B (nl)

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3872249A (en) * 1973-09-18 1975-03-18 Sansui Electric Co Encoding method for converting multi-channel sound signals into 2-channel composite signals
US3914705A (en) * 1973-08-27 1975-10-21 Sansui Electric Co Control circuit with field effect transistors of a gain control amplifier
US3934086A (en) * 1973-08-20 1976-01-20 Sansui Electric Co., Ltd. Matrix four-channel decoding system
US3937885A (en) * 1974-09-06 1976-02-10 Motorola, Inc. Control circuit for a matrixed four channel audio reproducing system
US3943287A (en) * 1974-06-03 1976-03-09 Cbs Inc. Apparatus and method for decoding four channel sound
US3944735A (en) * 1974-03-25 1976-03-16 John C. Bogue Directional enhancement system for quadraphonic decoders
US3947637A (en) * 1973-09-26 1976-03-30 Hitachi, Ltd. Signal composing circuit
US3952157A (en) * 1973-03-07 1976-04-20 Sansui Electric Co., Ltd. Matrix four-channel decoding system
US3967063A (en) * 1971-06-23 1976-06-29 Cbs Inc. Logic for matrix systems for reproducing quadraphonic sound
US4021612A (en) * 1974-11-07 1977-05-03 Sansui Electric Co., Ltd. Decoder apparatus applicable to matrix 4-channel systems of different types
DE3607610A1 (de) * 1985-03-07 1986-09-18 Dolby Laboratories Licensing Corp., San Francisco, Calif. Decoder
US4862502A (en) * 1988-01-06 1989-08-29 Lexicon, Inc. Sound reproduction
US5046098A (en) * 1985-03-07 1991-09-03 Dolby Laboratories Licensing Corporation Variable matrix decoder with three output channels
US5136650A (en) * 1991-01-09 1992-08-04 Lexicon, Inc. Sound reproduction
EP0533757A1 (en) * 1990-06-08 1993-03-31 Harman International Industries, Incorporated Surround processor
US5727068A (en) * 1996-03-01 1998-03-10 Cinema Group, Ltd. Matrix decoding method and apparatus
US5796844A (en) * 1996-07-19 1998-08-18 Lexicon Multichannel active matrix sound reproduction with maximum lateral separation
US5870480A (en) * 1996-07-19 1999-02-09 Lexicon Multichannel active matrix encoder and decoder with maximum lateral separation
US20060045291A1 (en) * 2004-08-31 2006-03-02 Digital Theater Systems, Inc. Method of mixing audio channels using correlated outputs
US20070055497A1 (en) * 2005-08-31 2007-03-08 Sony Corporation Audio signal processing apparatus, audio signal processing method, program, and input apparatus
US20070098181A1 (en) * 2005-11-02 2007-05-03 Sony Corporation Signal processing apparatus and method
US20070110258A1 (en) * 2005-11-11 2007-05-17 Sony Corporation Audio signal processing apparatus, and audio signal processing method
US20070189551A1 (en) * 2006-01-26 2007-08-16 Tadaaki Kimijima Audio signal processing apparatus, audio signal processing method, and audio signal processing program
US7280664B2 (en) 2000-08-31 2007-10-09 Dolby Laboratories Licensing Corporation Method for apparatus for audio matrix decoding
US20080019533A1 (en) * 2006-07-21 2008-01-24 Sony Corporation Audio signal processing apparatus, audio signal processing method, and program
US20080019531A1 (en) * 2006-07-21 2008-01-24 Sony Corporation Audio signal processing apparatus, audio signal processing method, and audio signal processing program
US20080130918A1 (en) * 2006-08-09 2008-06-05 Sony Corporation Apparatus, method and program for processing audio signal
US20080144338A1 (en) * 2005-06-30 2008-06-19 Takeshi Takano DC/DC converter, and power amplifier applying the same
US20100166190A1 (en) * 2006-08-10 2010-07-01 Koninklijke Philips Electronics N.V. Device for and a method of processing an audio signal
WO2012167302A1 (en) * 2011-06-06 2012-12-13 Reality Ip Pty Ltd Matrix encoder with improved channel separation
AU2015275309B2 (en) * 2011-06-06 2017-10-12 Reality Ip Pty Ltd Matrix encoder with improved channel separation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2502618A (en) * 2012-06-01 2013-12-04 British Sky Broadcasting Ltd Surround Sound Speaker System with Wireless Rear Speakers

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3786193A (en) * 1971-07-19 1974-01-15 Sony Corp Four channel decoder with variable mixing of the output channels

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3786193A (en) * 1971-07-19 1974-01-15 Sony Corp Four channel decoder with variable mixing of the output channels

Cited By (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967063A (en) * 1971-06-23 1976-06-29 Cbs Inc. Logic for matrix systems for reproducing quadraphonic sound
US3952157A (en) * 1973-03-07 1976-04-20 Sansui Electric Co., Ltd. Matrix four-channel decoding system
US3934086A (en) * 1973-08-20 1976-01-20 Sansui Electric Co., Ltd. Matrix four-channel decoding system
US3914705A (en) * 1973-08-27 1975-10-21 Sansui Electric Co Control circuit with field effect transistors of a gain control amplifier
US3872249A (en) * 1973-09-18 1975-03-18 Sansui Electric Co Encoding method for converting multi-channel sound signals into 2-channel composite signals
US3947637A (en) * 1973-09-26 1976-03-30 Hitachi, Ltd. Signal composing circuit
US3944735A (en) * 1974-03-25 1976-03-16 John C. Bogue Directional enhancement system for quadraphonic decoders
US3943287A (en) * 1974-06-03 1976-03-09 Cbs Inc. Apparatus and method for decoding four channel sound
US3937885A (en) * 1974-09-06 1976-02-10 Motorola, Inc. Control circuit for a matrixed four channel audio reproducing system
US4021612A (en) * 1974-11-07 1977-05-03 Sansui Electric Co., Ltd. Decoder apparatus applicable to matrix 4-channel systems of different types
DE3607610A1 (de) * 1985-03-07 1986-09-18 Dolby Laboratories Licensing Corp., San Francisco, Calif. Decoder
US4799260A (en) * 1985-03-07 1989-01-17 Dolby Laboratories Licensing Corporation Variable matrix decoder
US5046098A (en) * 1985-03-07 1991-09-03 Dolby Laboratories Licensing Corporation Variable matrix decoder with three output channels
US4862502A (en) * 1988-01-06 1989-08-29 Lexicon, Inc. Sound reproduction
EP0533757A1 (en) * 1990-06-08 1993-03-31 Harman International Industries, Incorporated Surround processor
EP0533757A4 (en) * 1990-06-08 1993-08-11 Harman International Industries, Incorporated Surround processor
US5136650A (en) * 1991-01-09 1992-08-04 Lexicon, Inc. Sound reproduction
US5727068A (en) * 1996-03-01 1998-03-10 Cinema Group, Ltd. Matrix decoding method and apparatus
US5796844A (en) * 1996-07-19 1998-08-18 Lexicon Multichannel active matrix sound reproduction with maximum lateral separation
US5870480A (en) * 1996-07-19 1999-02-09 Lexicon Multichannel active matrix encoder and decoder with maximum lateral separation
US7280664B2 (en) 2000-08-31 2007-10-09 Dolby Laboratories Licensing Corporation Method for apparatus for audio matrix decoding
US20060045291A1 (en) * 2004-08-31 2006-03-02 Digital Theater Systems, Inc. Method of mixing audio channels using correlated outputs
US7283634B2 (en) * 2004-08-31 2007-10-16 Dts, Inc. Method of mixing audio channels using correlated outputs
US20080144338A1 (en) * 2005-06-30 2008-06-19 Takeshi Takano DC/DC converter, and power amplifier applying the same
US7973522B2 (en) * 2005-06-30 2011-07-05 Fujitsu Limited DC/DC converter, and power amplifier applying the same
US8265301B2 (en) 2005-08-31 2012-09-11 Sony Corporation Audio signal processing apparatus, audio signal processing method, program, and input apparatus
US20070055497A1 (en) * 2005-08-31 2007-03-08 Sony Corporation Audio signal processing apparatus, audio signal processing method, program, and input apparatus
US20070098181A1 (en) * 2005-11-02 2007-05-03 Sony Corporation Signal processing apparatus and method
US20070110258A1 (en) * 2005-11-11 2007-05-17 Sony Corporation Audio signal processing apparatus, and audio signal processing method
US8311238B2 (en) * 2005-11-11 2012-11-13 Sony Corporation Audio signal processing apparatus, and audio signal processing method
US20070189551A1 (en) * 2006-01-26 2007-08-16 Tadaaki Kimijima Audio signal processing apparatus, audio signal processing method, and audio signal processing program
US8213648B2 (en) * 2006-01-26 2012-07-03 Sony Corporation Audio signal processing apparatus, audio signal processing method, and audio signal processing program
US20080019531A1 (en) * 2006-07-21 2008-01-24 Sony Corporation Audio signal processing apparatus, audio signal processing method, and audio signal processing program
US8160259B2 (en) 2006-07-21 2012-04-17 Sony Corporation Audio signal processing apparatus, audio signal processing method, and program
US20080019533A1 (en) * 2006-07-21 2008-01-24 Sony Corporation Audio signal processing apparatus, audio signal processing method, and program
US8368715B2 (en) 2006-07-21 2013-02-05 Sony Corporation Audio signal processing apparatus, audio signal processing method, and audio signal processing program
US20080130918A1 (en) * 2006-08-09 2008-06-05 Sony Corporation Apparatus, method and program for processing audio signal
US8369532B2 (en) * 2006-08-10 2013-02-05 Koninklijke Philips Electronics N.V. Device for and a method of processing an audio signal
US20100166190A1 (en) * 2006-08-10 2010-07-01 Koninklijke Philips Electronics N.V. Device for and a method of processing an audio signal
WO2012167302A1 (en) * 2011-06-06 2012-12-13 Reality Ip Pty Ltd Matrix encoder with improved channel separation
CN103718573A (zh) * 2011-06-06 2014-04-09 瑞丽地知识产权私人有限公司 具有改善的通道分离的矩阵编码器
EP2719201A4 (en) * 2011-06-06 2015-06-10 Reality Ip Pty Ltd MATRIX CODERS WITH IMPROVED CHANNEL SEPARATION
AU2012267193B2 (en) * 2011-06-06 2015-10-08 Reality Ip Pty Ltd Matrix encoder with improved channel separation
CN105120420A (zh) * 2011-06-06 2015-12-02 瑞丽地知识产权私人有限公司 具有改善的通道分离的矩阵编码器
US9418668B2 (en) 2011-06-06 2016-08-16 Reality Ip Pty Ltd Matrix encoder with improved channel separation
AU2015275309B2 (en) * 2011-06-06 2017-10-12 Reality Ip Pty Ltd Matrix encoder with improved channel separation

Also Published As

Publication number Publication date
NL159558B (nl) 1979-02-15
NL7214354A (nl) 1973-04-27
GB1402320A (en) 1975-08-06

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